Bug Summary

File:builtin/pack-objects.c
Location:line 1303, column 24
Description:Array access (from variable 'done_pbase_paths') results in a null pointer dereference

Annotated Source Code

1#include "builtin.h"
2#include "cache.h"
3#include "attr.h"
4#include "object.h"
5#include "blob.h"
6#include "commit.h"
7#include "tag.h"
8#include "tree.h"
9#include "delta.h"
10#include "pack.h"
11#include "pack-revindex.h"
12#include "csum-file.h"
13#include "tree-walk.h"
14#include "diff.h"
15#include "revision.h"
16#include "list-objects.h"
17#include "pack-objects.h"
18#include "progress.h"
19#include "refs.h"
20#include "streaming.h"
21#include "thread-utils.h"
22#include "pack-bitmap.h"
23#include "reachable.h"
24#include "sha1-array.h"
25#include "argv-array.h"
26#include "mru.h"
27
28static const char *pack_usage[] = {
29 N_("git pack-objects --stdout [<options>...] [< <ref-list> | < <object-list>]")("git pack-objects --stdout [<options>...] [< <ref-list> | < <object-list>]"
),
30 N_("git pack-objects [<options>...] <base-name> [< <ref-list> | < <object-list>]")("git pack-objects [<options>...] <base-name> [< <ref-list> | < <object-list>]"
),
31 NULL((void*)0)
32};
33
34/*
35 * Objects we are going to pack are collected in the `to_pack` structure.
36 * It contains an array (dynamically expanded) of the object data, and a map
37 * that can resolve SHA1s to their position in the array.
38 */
39static struct packing_data to_pack;
40
41static struct pack_idx_entry **written_list;
42static uint32_t nr_result, nr_written;
43
44static int non_empty;
45static int reuse_delta = 1, reuse_object = 1;
46static int keep_unreachable, unpack_unreachable, include_tag;
47static unsigned long unpack_unreachable_expiration;
48static int pack_loose_unreachable;
49static int local;
50static int have_non_local_packs;
51static int incremental;
52static int ignore_packed_keep;
53static int allow_ofs_delta;
54static struct pack_idx_option pack_idx_opts;
55static const char *base_name;
56static int progress = 1;
57static int window = 10;
58static unsigned long pack_size_limit;
59static int depth = 50;
60static int delta_search_threads;
61static int pack_to_stdout;
62static int num_preferred_base;
63static struct progress *progress_state;
64
65static struct packed_git *reuse_packfile;
66static uint32_t reuse_packfile_objects;
67static off_t reuse_packfile_offset;
68
69static int use_bitmap_index_default = 1;
70static int use_bitmap_index = -1;
71static int write_bitmap_index;
72static uint16_t write_bitmap_options;
73
74static unsigned long delta_cache_size = 0;
75static unsigned long max_delta_cache_size = 256 * 1024 * 1024;
76static unsigned long cache_max_small_delta_size = 1000;
77
78static unsigned long window_memory_limit = 0;
79
80/*
81 * stats
82 */
83static uint32_t written, written_delta;
84static uint32_t reused, reused_delta;
85
86/*
87 * Indexed commits
88 */
89static struct commit **indexed_commits;
90static unsigned int indexed_commits_nr;
91static unsigned int indexed_commits_alloc;
92
93static void index_commit_for_bitmap(struct commit *commit)
94{
95 if (indexed_commits_nr >= indexed_commits_alloc) {
96 indexed_commits_alloc = (indexed_commits_alloc + 32) * 2;
97 REALLOC_ARRAY(indexed_commits, indexed_commits_alloc)(indexed_commits) = xrealloc((indexed_commits), st_mult(sizeof
(*(indexed_commits)), (indexed_commits_alloc)));
98 }
99
100 indexed_commits[indexed_commits_nr++] = commit;
101}
102
103static void *get_delta(struct object_entry *entry)
104{
105 unsigned long size, base_size, delta_size;
106 void *buf, *base_buf, *delta_buf;
107 enum object_type type;
108
109 buf = read_sha1_file(entry->idx.sha1, &type, &size);
110 if (!buf)
111 die("unable to read %s", sha1_to_hex(entry->idx.sha1));
112 base_buf = read_sha1_file(entry->delta->idx.sha1, &type, &base_size);
113 if (!base_buf)
114 die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
115 delta_buf = diff_delta(base_buf, base_size,
116 buf, size, &delta_size, 0);
117 if (!delta_buf || delta_size != entry->delta_size)
118 die("delta size changed");
119 free(buf);
120 free(base_buf);
121 return delta_buf;
122}
123
124static unsigned long do_compress(void **pptr, unsigned long size)
125{
126 git_zstream stream;
127 void *in, *out;
128 unsigned long maxsize;
129
130 git_deflate_init(&stream, pack_compression_level);
131 maxsize = git_deflate_bound(&stream, size);
132
133 in = *pptr;
134 out = xmalloc(maxsize);
135 *pptr = out;
136
137 stream.next_in = in;
138 stream.avail_in = size;
139 stream.next_out = out;
140 stream.avail_out = maxsize;
141 while (git_deflate(&stream, Z_FINISH4) == Z_OK0)
142 ; /* nothing */
143 git_deflate_end(&stream);
144
145 free(in);
146 return stream.total_out;
147}
148
149static unsigned long write_large_blob_data(struct git_istream *st, struct sha1file *f,
150 const unsigned char *sha1)
151{
152 git_zstream stream;
153 unsigned char ibuf[1024 * 16];
154 unsigned char obuf[1024 * 16];
155 unsigned long olen = 0;
156
157 git_deflate_init(&stream, pack_compression_level);
158
159 for (;;) {
160 ssize_t readlen;
161 int zret = Z_OK0;
162 readlen = read_istream(st, ibuf, sizeof(ibuf));
163 if (readlen == -1)
164 die(_("unable to read %s"), sha1_to_hex(sha1));
165
166 stream.next_in = ibuf;
167 stream.avail_in = readlen;
168 while ((stream.avail_in || readlen == 0) &&
169 (zret == Z_OK0 || zret == Z_BUF_ERROR(-5))) {
170 stream.next_out = obuf;
171 stream.avail_out = sizeof(obuf);
172 zret = git_deflate(&stream, readlen ? 0 : Z_FINISH4);
173 sha1write(f, obuf, stream.next_out - obuf);
174 olen += stream.next_out - obuf;
175 }
176 if (stream.avail_in)
177 die(_("deflate error (%d)"), zret);
178 if (readlen == 0) {
179 if (zret != Z_STREAM_END1)
180 die(_("deflate error (%d)"), zret);
181 break;
182 }
183 }
184 git_deflate_end(&stream);
185 return olen;
186}
187
188/*
189 * we are going to reuse the existing object data as is. make
190 * sure it is not corrupt.
191 */
192static int check_pack_inflate(struct packed_git *p,
193 struct pack_window **w_curs,
194 off_t offset,
195 off_t len,
196 unsigned long expect)
197{
198 git_zstream stream;
199 unsigned char fakebuf[4096], *in;
200 int st;
201
202 memset(&stream, 0, sizeof(stream))__builtin___memset_chk (&stream, 0, sizeof(stream), __builtin_object_size
(&stream, 0));
203 git_inflate_init(&stream);
204 do {
205 in = use_pack(p, w_curs, offset, &stream.avail_in);
206 stream.next_in = in;
207 stream.next_out = fakebuf;
208 stream.avail_out = sizeof(fakebuf);
209 st = git_inflate(&stream, Z_FINISH4);
210 offset += stream.next_in - in;
211 } while (st == Z_OK0 || st == Z_BUF_ERROR(-5));
212 git_inflate_end(&stream);
213 return (st == Z_STREAM_END1 &&
214 stream.total_out == expect &&
215 stream.total_in == len) ? 0 : -1;
216}
217
218static void copy_pack_data(struct sha1file *f,
219 struct packed_git *p,
220 struct pack_window **w_curs,
221 off_t offset,
222 off_t len)
223{
224 unsigned char *in;
225 unsigned long avail;
226
227 while (len) {
228 in = use_pack(p, w_curs, offset, &avail);
229 if (avail > len)
230 avail = (unsigned long)len;
231 sha1write(f, in, avail);
232 offset += avail;
233 len -= avail;
234 }
235}
236
237/* Return 0 if we will bust the pack-size limit */
238static unsigned long write_no_reuse_object(struct sha1file *f, struct object_entry *entry,
239 unsigned long limit, int usable_delta)
240{
241 unsigned long size, datalen;
242 unsigned char header[10], dheader[10];
243 unsigned hdrlen;
244 enum object_type type;
245 void *buf;
246 struct git_istream *st = NULL((void*)0);
247
248 if (!usable_delta) {
249 if (entry->type == OBJ_BLOB &&
250 entry->size > big_file_threshold &&
251 (st = open_istream(entry->idx.sha1, &type, &size, NULL((void*)0))) != NULL((void*)0))
252 buf = NULL((void*)0);
253 else {
254 buf = read_sha1_file(entry->idx.sha1, &type, &size);
255 if (!buf)
256 die(_("unable to read %s"), sha1_to_hex(entry->idx.sha1));
257 }
258 /*
259 * make sure no cached delta data remains from a
260 * previous attempt before a pack split occurred.
261 */
262 free(entry->delta_data);
263 entry->delta_data = NULL((void*)0);
264 entry->z_delta_size = 0;
265 } else if (entry->delta_data) {
266 size = entry->delta_size;
267 buf = entry->delta_data;
268 entry->delta_data = NULL((void*)0);
269 type = (allow_ofs_delta && entry->delta->idx.offset) ?
270 OBJ_OFS_DELTA : OBJ_REF_DELTA;
271 } else {
272 buf = get_delta(entry);
273 size = entry->delta_size;
274 type = (allow_ofs_delta && entry->delta->idx.offset) ?
275 OBJ_OFS_DELTA : OBJ_REF_DELTA;
276 }
277
278 if (st) /* large blob case, just assume we don't compress well */
279 datalen = size;
280 else if (entry->z_delta_size)
281 datalen = entry->z_delta_size;
282 else
283 datalen = do_compress(&buf, size);
284
285 /*
286 * The object header is a byte of 'type' followed by zero or
287 * more bytes of length.
288 */
289 hdrlen = encode_in_pack_object_header(type, size, header);
290
291 if (type == OBJ_OFS_DELTA) {
292 /*
293 * Deltas with relative base contain an additional
294 * encoding of the relative offset for the delta
295 * base from this object's position in the pack.
296 */
297 off_t ofs = entry->idx.offset - entry->delta->idx.offset;
298 unsigned pos = sizeof(dheader) - 1;
299 dheader[pos] = ofs & 127;
300 while (ofs >>= 7)
301 dheader[--pos] = 128 | (--ofs & 127);
302 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
303 if (st)
304 close_istream(st);
305 free(buf);
306 return 0;
307 }
308 sha1write(f, header, hdrlen);
309 sha1write(f, dheader + pos, sizeof(dheader) - pos);
310 hdrlen += sizeof(dheader) - pos;
311 } else if (type == OBJ_REF_DELTA) {
312 /*
313 * Deltas with a base reference contain
314 * an additional 20 bytes for the base sha1.
315 */
316 if (limit && hdrlen + 20 + datalen + 20 >= limit) {
317 if (st)
318 close_istream(st);
319 free(buf);
320 return 0;
321 }
322 sha1write(f, header, hdrlen);
323 sha1write(f, entry->delta->idx.sha1, 20);
324 hdrlen += 20;
325 } else {
326 if (limit && hdrlen + datalen + 20 >= limit) {
327 if (st)
328 close_istream(st);
329 free(buf);
330 return 0;
331 }
332 sha1write(f, header, hdrlen);
333 }
334 if (st) {
335 datalen = write_large_blob_data(st, f, entry->idx.sha1);
336 close_istream(st);
337 } else {
338 sha1write(f, buf, datalen);
339 free(buf);
340 }
341
342 return hdrlen + datalen;
343}
344
345/* Return 0 if we will bust the pack-size limit */
346static off_t write_reuse_object(struct sha1file *f, struct object_entry *entry,
347 unsigned long limit, int usable_delta)
348{
349 struct packed_git *p = entry->in_pack;
350 struct pack_window *w_curs = NULL((void*)0);
351 struct revindex_entry *revidx;
352 off_t offset;
353 enum object_type type = entry->type;
354 off_t datalen;
355 unsigned char header[10], dheader[10];
356 unsigned hdrlen;
357
358 if (entry->delta)
359 type = (allow_ofs_delta && entry->delta->idx.offset) ?
360 OBJ_OFS_DELTA : OBJ_REF_DELTA;
361 hdrlen = encode_in_pack_object_header(type, entry->size, header);
362
363 offset = entry->in_pack_offset;
364 revidx = find_pack_revindex(p, offset);
365 datalen = revidx[1].offset - offset;
366 if (!pack_to_stdout && p->index_version > 1 &&
367 check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
368 error("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1))(error("bad packed object CRC for %s", sha1_to_hex(entry->
idx.sha1)), const_error());
369 unuse_pack(&w_curs);
370 return write_no_reuse_object(f, entry, limit, usable_delta);
371 }
372
373 offset += entry->in_pack_header_size;
374 datalen -= entry->in_pack_header_size;
375
376 if (!pack_to_stdout && p->index_version == 1 &&
377 check_pack_inflate(p, &w_curs, offset, datalen, entry->size)) {
378 error("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1))(error("corrupt packed object for %s", sha1_to_hex(entry->
idx.sha1)), const_error());
379 unuse_pack(&w_curs);
380 return write_no_reuse_object(f, entry, limit, usable_delta);
381 }
382
383 if (type == OBJ_OFS_DELTA) {
384 off_t ofs = entry->idx.offset - entry->delta->idx.offset;
385 unsigned pos = sizeof(dheader) - 1;
386 dheader[pos] = ofs & 127;
387 while (ofs >>= 7)
388 dheader[--pos] = 128 | (--ofs & 127);
389 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
390 unuse_pack(&w_curs);
391 return 0;
392 }
393 sha1write(f, header, hdrlen);
394 sha1write(f, dheader + pos, sizeof(dheader) - pos);
395 hdrlen += sizeof(dheader) - pos;
396 reused_delta++;
397 } else if (type == OBJ_REF_DELTA) {
398 if (limit && hdrlen + 20 + datalen + 20 >= limit) {
399 unuse_pack(&w_curs);
400 return 0;
401 }
402 sha1write(f, header, hdrlen);
403 sha1write(f, entry->delta->idx.sha1, 20);
404 hdrlen += 20;
405 reused_delta++;
406 } else {
407 if (limit && hdrlen + datalen + 20 >= limit) {
408 unuse_pack(&w_curs);
409 return 0;
410 }
411 sha1write(f, header, hdrlen);
412 }
413 copy_pack_data(f, p, &w_curs, offset, datalen);
414 unuse_pack(&w_curs);
415 reused++;
416 return hdrlen + datalen;
417}
418
419/* Return 0 if we will bust the pack-size limit */
420static off_t write_object(struct sha1file *f,
421 struct object_entry *entry,
422 off_t write_offset)
423{
424 unsigned long limit;
425 off_t len;
426 int usable_delta, to_reuse;
427
428 if (!pack_to_stdout)
429 crc32_begin(f);
430
431 /* apply size limit if limited packsize and not first object */
432 if (!pack_size_limit || !nr_written)
433 limit = 0;
434 else if (pack_size_limit <= write_offset)
435 /*
436 * the earlier object did not fit the limit; avoid
437 * mistaking this with unlimited (i.e. limit = 0).
438 */
439 limit = 1;
440 else
441 limit = pack_size_limit - write_offset;
442
443 if (!entry->delta)
444 usable_delta = 0; /* no delta */
445 else if (!pack_size_limit)
446 usable_delta = 1; /* unlimited packfile */
447 else if (entry->delta->idx.offset == (off_t)-1)
448 usable_delta = 0; /* base was written to another pack */
449 else if (entry->delta->idx.offset)
450 usable_delta = 1; /* base already exists in this pack */
451 else
452 usable_delta = 0; /* base could end up in another pack */
453
454 if (!reuse_object)
455 to_reuse = 0; /* explicit */
456 else if (!entry->in_pack)
457 to_reuse = 0; /* can't reuse what we don't have */
458 else if (entry->type == OBJ_REF_DELTA || entry->type == OBJ_OFS_DELTA)
459 /* check_object() decided it for us ... */
460 to_reuse = usable_delta;
461 /* ... but pack split may override that */
462 else if (entry->type != entry->in_pack_type)
463 to_reuse = 0; /* pack has delta which is unusable */
464 else if (entry->delta)
465 to_reuse = 0; /* we want to pack afresh */
466 else
467 to_reuse = 1; /* we have it in-pack undeltified,
468 * and we do not need to deltify it.
469 */
470
471 if (!to_reuse)
472 len = write_no_reuse_object(f, entry, limit, usable_delta);
473 else
474 len = write_reuse_object(f, entry, limit, usable_delta);
475 if (!len)
476 return 0;
477
478 if (usable_delta)
479 written_delta++;
480 written++;
481 if (!pack_to_stdout)
482 entry->idx.crc32 = crc32_end(f);
483 return len;
484}
485
486enum write_one_status {
487 WRITE_ONE_SKIP = -1, /* already written */
488 WRITE_ONE_BREAK = 0, /* writing this will bust the limit; not written */
489 WRITE_ONE_WRITTEN = 1, /* normal */
490 WRITE_ONE_RECURSIVE = 2 /* already scheduled to be written */
491};
492
493static enum write_one_status write_one(struct sha1file *f,
494 struct object_entry *e,
495 off_t *offset)
496{
497 off_t size;
498 int recursing;
499
500 /*
501 * we set offset to 1 (which is an impossible value) to mark
502 * the fact that this object is involved in "write its base
503 * first before writing a deltified object" recursion.
504 */
505 recursing = (e->idx.offset == 1);
506 if (recursing) {
507 warning("recursive delta detected for object %s",
508 sha1_to_hex(e->idx.sha1));
509 return WRITE_ONE_RECURSIVE;
510 } else if (e->idx.offset || e->preferred_base) {
511 /* offset is non zero if object is written already. */
512 return WRITE_ONE_SKIP;
513 }
514
515 /* if we are deltified, write out base object first. */
516 if (e->delta) {
517 e->idx.offset = 1; /* now recurse */
518 switch (write_one(f, e->delta, offset)) {
519 case WRITE_ONE_RECURSIVE:
520 /* we cannot depend on this one */
521 e->delta = NULL((void*)0);
522 break;
523 default:
524 break;
525 case WRITE_ONE_BREAK:
526 e->idx.offset = recursing;
527 return WRITE_ONE_BREAK;
528 }
529 }
530
531 e->idx.offset = *offset;
532 size = write_object(f, e, *offset);
533 if (!size) {
534 e->idx.offset = recursing;
535 return WRITE_ONE_BREAK;
536 }
537 written_list[nr_written++] = &e->idx;
538
539 /* make sure off_t is sufficiently large not to wrap */
540 if (signed_add_overflows(*offset, size)((size) > (9223372036854775807LL >> ((8 * sizeof(intmax_t
)) - (8 * sizeof(*offset)))) - (*offset)))
541 die("pack too large for current definition of off_t");
542 *offset += size;
543 return WRITE_ONE_WRITTEN;
544}
545
546static int mark_tagged(const char *path, const struct object_id *oid, int flag,
547 void *cb_data)
548{
549 unsigned char peeled[20];
550 struct object_entry *entry = packlist_find(&to_pack, oid->hash, NULL((void*)0));
551
552 if (entry)
553 entry->tagged = 1;
554 if (!peel_ref(path, peeled)) {
555 entry = packlist_find(&to_pack, peeled, NULL((void*)0));
556 if (entry)
557 entry->tagged = 1;
558 }
559 return 0;
560}
561
562static inline void add_to_write_order(struct object_entry **wo,
563 unsigned int *endp,
564 struct object_entry *e)
565{
566 if (e->filled)
567 return;
568 wo[(*endp)++] = e;
569 e->filled = 1;
570}
571
572static void add_descendants_to_write_order(struct object_entry **wo,
573 unsigned int *endp,
574 struct object_entry *e)
575{
576 int add_to_order = 1;
577 while (e) {
578 if (add_to_order) {
579 struct object_entry *s;
580 /* add this node... */
581 add_to_write_order(wo, endp, e);
582 /* all its siblings... */
583 for (s = e->delta_sibling; s; s = s->delta_sibling) {
584 add_to_write_order(wo, endp, s);
585 }
586 }
587 /* drop down a level to add left subtree nodes if possible */
588 if (e->delta_child) {
589 add_to_order = 1;
590 e = e->delta_child;
591 } else {
592 add_to_order = 0;
593 /* our sibling might have some children, it is next */
594 if (e->delta_sibling) {
595 e = e->delta_sibling;
596 continue;
597 }
598 /* go back to our parent node */
599 e = e->delta;
600 while (e && !e->delta_sibling) {
601 /* we're on the right side of a subtree, keep
602 * going up until we can go right again */
603 e = e->delta;
604 }
605 if (!e) {
606 /* done- we hit our original root node */
607 return;
608 }
609 /* pass it off to sibling at this level */
610 e = e->delta_sibling;
611 }
612 };
613}
614
615static void add_family_to_write_order(struct object_entry **wo,
616 unsigned int *endp,
617 struct object_entry *e)
618{
619 struct object_entry *root;
620
621 for (root = e; root->delta; root = root->delta)
622 ; /* nothing */
623 add_descendants_to_write_order(wo, endp, root);
624}
625
626static struct object_entry **compute_write_order(void)
627{
628 unsigned int i, wo_end, last_untagged;
629
630 struct object_entry **wo;
631 struct object_entry *objects = to_pack.objects;
632
633 for (i = 0; i < to_pack.nr_objects; i++) {
634 objects[i].tagged = 0;
635 objects[i].filled = 0;
636 objects[i].delta_child = NULL((void*)0);
637 objects[i].delta_sibling = NULL((void*)0);
638 }
639
640 /*
641 * Fully connect delta_child/delta_sibling network.
642 * Make sure delta_sibling is sorted in the original
643 * recency order.
644 */
645 for (i = to_pack.nr_objects; i > 0;) {
646 struct object_entry *e = &objects[--i];
647 if (!e->delta)
648 continue;
649 /* Mark me as the first child */
650 e->delta_sibling = e->delta->delta_child;
651 e->delta->delta_child = e;
652 }
653
654 /*
655 * Mark objects that are at the tip of tags.
656 */
657 for_each_tag_ref(mark_tagged, NULL((void*)0));
658
659 /*
660 * Give the objects in the original recency order until
661 * we see a tagged tip.
662 */
663 ALLOC_ARRAY(wo, to_pack.nr_objects)(wo) = xmalloc(st_mult(sizeof(*(wo)), (to_pack.nr_objects)));
664 for (i = wo_end = 0; i < to_pack.nr_objects; i++) {
665 if (objects[i].tagged)
666 break;
667 add_to_write_order(wo, &wo_end, &objects[i]);
668 }
669 last_untagged = i;
670
671 /*
672 * Then fill all the tagged tips.
673 */
674 for (; i < to_pack.nr_objects; i++) {
675 if (objects[i].tagged)
676 add_to_write_order(wo, &wo_end, &objects[i]);
677 }
678
679 /*
680 * And then all remaining commits and tags.
681 */
682 for (i = last_untagged; i < to_pack.nr_objects; i++) {
683 if (objects[i].type != OBJ_COMMIT &&
684 objects[i].type != OBJ_TAG)
685 continue;
686 add_to_write_order(wo, &wo_end, &objects[i]);
687 }
688
689 /*
690 * And then all the trees.
691 */
692 for (i = last_untagged; i < to_pack.nr_objects; i++) {
693 if (objects[i].type != OBJ_TREE)
694 continue;
695 add_to_write_order(wo, &wo_end, &objects[i]);
696 }
697
698 /*
699 * Finally all the rest in really tight order
700 */
701 for (i = last_untagged; i < to_pack.nr_objects; i++) {
702 if (!objects[i].filled)
703 add_family_to_write_order(wo, &wo_end, &objects[i]);
704 }
705
706 if (wo_end != to_pack.nr_objects)
707 die("ordered %u objects, expected %"PRIu32"u", wo_end, to_pack.nr_objects);
708
709 return wo;
710}
711
712static off_t write_reused_pack(struct sha1file *f)
713{
714 unsigned char buffer[8192];
715 off_t to_write, total;
716 int fd;
717
718 if (!is_pack_valid(reuse_packfile))
719 die("packfile is invalid: %s", reuse_packfile->pack_name);
720
721 fd = git_open(reuse_packfile->pack_name)git_open_cloexec(reuse_packfile->pack_name, 0x0000);
722 if (fd < 0)
723 die_errno("unable to open packfile for reuse: %s",
724 reuse_packfile->pack_name);
725
726 if (lseek(fd, sizeof(struct pack_header), SEEK_SET0) == -1)
727 die_errno("unable to seek in reused packfile");
728
729 if (reuse_packfile_offset < 0)
730 reuse_packfile_offset = reuse_packfile->pack_size - 20;
731
732 total = to_write = reuse_packfile_offset - sizeof(struct pack_header);
733
734 while (to_write) {
735 int read_pack = xread(fd, buffer, sizeof(buffer));
736
737 if (read_pack <= 0)
738 die_errno("unable to read from reused packfile");
739
740 if (read_pack > to_write)
741 read_pack = to_write;
742
743 sha1write(f, buffer, read_pack);
744 to_write -= read_pack;
745
746 /*
747 * We don't know the actual number of objects written,
748 * only how many bytes written, how many bytes total, and
749 * how many objects total. So we can fake it by pretending all
750 * objects we are writing are the same size. This gives us a
751 * smooth progress meter, and at the end it matches the true
752 * answer.
753 */
754 written = reuse_packfile_objects *
755 (((double)(total - to_write)) / total);
756 display_progress(progress_state, written);
757 }
758
759 close(fd);
760 written = reuse_packfile_objects;
761 display_progress(progress_state, written);
762 return reuse_packfile_offset - sizeof(struct pack_header);
763}
764
765static const char no_split_warning[] = N_(("disabling bitmap writing, packs are split due to pack.packSizeLimit"
)
766"disabling bitmap writing, packs are split due to pack.packSizeLimit"("disabling bitmap writing, packs are split due to pack.packSizeLimit"
)
767)("disabling bitmap writing, packs are split due to pack.packSizeLimit"
);
768
769static void write_pack_file(void)
770{
771 uint32_t i = 0, j;
772 struct sha1file *f;
773 off_t offset;
774 uint32_t nr_remaining = nr_result;
775 time_t last_mtime = 0;
776 struct object_entry **write_order;
777
778 if (progress > pack_to_stdout)
779 progress_state = start_progress(_("Writing objects"), nr_result);
780 ALLOC_ARRAY(written_list, to_pack.nr_objects)(written_list) = xmalloc(st_mult(sizeof(*(written_list)), (to_pack
.nr_objects)));
781 write_order = compute_write_order();
782
783 do {
784 unsigned char sha1[20];
785 char *pack_tmp_name = NULL((void*)0);
786
787 if (pack_to_stdout)
788 f = sha1fd_throughput(1, "<stdout>", progress_state);
789 else
790 f = create_tmp_packfile(&pack_tmp_name);
791
792 offset = write_pack_header(f, nr_remaining);
793
794 if (reuse_packfile) {
795 off_t packfile_size;
796 assert(pack_to_stdout)(__builtin_expect(!(pack_to_stdout), 0) ? __assert_rtn(__func__
, "builtin/pack-objects.c", 796, "pack_to_stdout") : (void)0);
797
798 packfile_size = write_reused_pack(f);
799 offset += packfile_size;
800 }
801
802 nr_written = 0;
803 for (; i < to_pack.nr_objects; i++) {
804 struct object_entry *e = write_order[i];
805 if (write_one(f, e, &offset) == WRITE_ONE_BREAK)
806 break;
807 display_progress(progress_state, written);
808 }
809
810 /*
811 * Did we write the wrong # entries in the header?
812 * If so, rewrite it like in fast-import
813 */
814 if (pack_to_stdout) {
815 sha1close(f, sha1, CSUM_CLOSE1);
816 } else if (nr_written == nr_remaining) {
817 sha1close(f, sha1, CSUM_FSYNC2);
818 } else {
819 int fd = sha1close(f, sha1, 0);
820 fixup_pack_header_footer(fd, sha1, pack_tmp_name,
821 nr_written, sha1, offset);
822 close(fd);
823 if (write_bitmap_index) {
824 warning(_(no_split_warning));
825 write_bitmap_index = 0;
826 }
827 }
828
829 if (!pack_to_stdout) {
830 struct stat st;
831 struct strbuf tmpname = STRBUF_INIT{ 0, 0, strbuf_slopbuf };
832
833 /*
834 * Packs are runtime accessed in their mtime
835 * order since newer packs are more likely to contain
836 * younger objects. So if we are creating multiple
837 * packs then we should modify the mtime of later ones
838 * to preserve this property.
839 */
840 if (stat(pack_tmp_name, &st) < 0) {
841 warning_errno("failed to stat %s", pack_tmp_name);
842 } else if (!last_mtime) {
843 last_mtime = st.st_mtimest_mtimespec.tv_sec;
844 } else {
845 struct utimbuf utb;
846 utb.actime = st.st_atimest_atimespec.tv_sec;
847 utb.modtime = --last_mtime;
848 if (utime(pack_tmp_name, &utb) < 0)
849 warning_errno("failed utime() on %s", pack_tmp_name);
850 }
851
852 strbuf_addf(&tmpname, "%s-", base_name);
853
854 if (write_bitmap_index) {
855 bitmap_writer_set_checksum(sha1);
856 bitmap_writer_build_type_index(written_list, nr_written);
857 }
858
859 finish_tmp_packfile(&tmpname, pack_tmp_name,
860 written_list, nr_written,
861 &pack_idx_opts, sha1);
862
863 if (write_bitmap_index) {
864 strbuf_addf(&tmpname, "%s.bitmap", sha1_to_hex(sha1));
865
866 stop_progress(&progress_state);
867
868 bitmap_writer_show_progress(progress);
869 bitmap_writer_reuse_bitmaps(&to_pack);
870 bitmap_writer_select_commits(indexed_commits, indexed_commits_nr, -1);
871 bitmap_writer_build(&to_pack);
872 bitmap_writer_finish(written_list, nr_written,
873 tmpname.buf, write_bitmap_options);
874 write_bitmap_index = 0;
875 }
876
877 strbuf_release(&tmpname);
878 free(pack_tmp_name);
879 puts(sha1_to_hex(sha1));
880 }
881
882 /* mark written objects as written to previous pack */
883 for (j = 0; j < nr_written; j++) {
884 written_list[j]->offset = (off_t)-1;
885 }
886 nr_remaining -= nr_written;
887 } while (nr_remaining && i < to_pack.nr_objects);
888
889 free(written_list);
890 free(write_order);
891 stop_progress(&progress_state);
892 if (written != nr_result)
893 die("wrote %"PRIu32"u"" objects while expecting %"PRIu32"u",
894 written, nr_result);
895}
896
897static void setup_delta_attr_check(struct git_attr_check *check)
898{
899 static struct git_attr *attr_delta;
900
901 if (!attr_delta)
902 attr_delta = git_attr("delta");
903
904 check[0].attr = attr_delta;
905}
906
907static int no_try_delta(const char *path)
908{
909 struct git_attr_check check[1];
910
911 setup_delta_attr_check(check);
912 if (git_check_attr(path, ARRAY_SIZE(check)(sizeof(check) / sizeof((check)[0]) + (sizeof(char [1 - 2*!(!
__builtin_types_compatible_p(__typeof__(check), __typeof__(&
(check)[0])))]) - 1)), check))
913 return 0;
914 if (ATTR_FALSE(check->value)((check->value) == git_attr__false))
915 return 1;
916 return 0;
917}
918
919/*
920 * When adding an object, check whether we have already added it
921 * to our packing list. If so, we can skip. However, if we are
922 * being asked to excludei t, but the previous mention was to include
923 * it, make sure to adjust its flags and tweak our numbers accordingly.
924 *
925 * As an optimization, we pass out the index position where we would have
926 * found the item, since that saves us from having to look it up again a
927 * few lines later when we want to add the new entry.
928 */
929static int have_duplicate_entry(const unsigned char *sha1,
930 int exclude,
931 uint32_t *index_pos)
932{
933 struct object_entry *entry;
934
935 entry = packlist_find(&to_pack, sha1, index_pos);
936 if (!entry)
937 return 0;
938
939 if (exclude) {
940 if (!entry->preferred_base)
941 nr_result--;
942 entry->preferred_base = 1;
943 }
944
945 return 1;
946}
947
948static int want_found_object(int exclude, struct packed_git *p)
949{
950 if (exclude)
951 return 1;
952 if (incremental)
953 return 0;
954
955 /*
956 * When asked to do --local (do not include an object that appears in a
957 * pack we borrow from elsewhere) or --honor-pack-keep (do not include
958 * an object that appears in a pack marked with .keep), finding a pack
959 * that matches the criteria is sufficient for us to decide to omit it.
960 * However, even if this pack does not satisfy the criteria, we need to
961 * make sure no copy of this object appears in _any_ pack that makes us
962 * to omit the object, so we need to check all the packs.
963 *
964 * We can however first check whether these options can possible matter;
965 * if they do not matter we know we want the object in generated pack.
966 * Otherwise, we signal "-1" at the end to tell the caller that we do
967 * not know either way, and it needs to check more packs.
968 */
969 if (!ignore_packed_keep &&
970 (!local || !have_non_local_packs))
971 return 1;
972
973 if (local && !p->pack_local)
974 return 0;
975 if (ignore_packed_keep && p->pack_local && p->pack_keep)
976 return 0;
977
978 /* we don't know yet; keep looking for more packs */
979 return -1;
980}
981
982/*
983 * Check whether we want the object in the pack (e.g., we do not want
984 * objects found in non-local stores if the "--local" option was used).
985 *
986 * If the caller already knows an existing pack it wants to take the object
987 * from, that is passed in *found_pack and *found_offset; otherwise this
988 * function finds if there is any pack that has the object and returns the pack
989 * and its offset in these variables.
990 */
991static int want_object_in_pack(const unsigned char *sha1,
992 int exclude,
993 struct packed_git **found_pack,
994 off_t *found_offset)
995{
996 struct mru_entry *entry;
997 int want;
998
999 if (!exclude && local && has_loose_object_nonlocal(sha1))
1000 return 0;
1001
1002 /*
1003 * If we already know the pack object lives in, start checks from that
1004 * pack - in the usual case when neither --local was given nor .keep files
1005 * are present we will determine the answer right now.
1006 */
1007 if (*found_pack) {
1008 want = want_found_object(exclude, *found_pack);
1009 if (want != -1)
1010 return want;
1011 }
1012
1013 for (entry = packed_git_mru->head; entry; entry = entry->next) {
1014 struct packed_git *p = entry->item;
1015 off_t offset;
1016
1017 if (p == *found_pack)
1018 offset = *found_offset;
1019 else
1020 offset = find_pack_entry_one(sha1, p);
1021
1022 if (offset) {
1023 if (!*found_pack) {
1024 if (!is_pack_valid(p))
1025 continue;
1026 *found_offset = offset;
1027 *found_pack = p;
1028 }
1029 want = want_found_object(exclude, p);
1030 if (!exclude && want > 0)
1031 mru_mark(packed_git_mru, entry);
1032 if (want != -1)
1033 return want;
1034 }
1035 }
1036
1037 return 1;
1038}
1039
1040static void create_object_entry(const unsigned char *sha1,
1041 enum object_type type,
1042 uint32_t hash,
1043 int exclude,
1044 int no_try_delta,
1045 uint32_t index_pos,
1046 struct packed_git *found_pack,
1047 off_t found_offset)
1048{
1049 struct object_entry *entry;
1050
1051 entry = packlist_alloc(&to_pack, sha1, index_pos);
1052 entry->hash = hash;
1053 if (type)
1054 entry->type = type;
1055 if (exclude)
1056 entry->preferred_base = 1;
1057 else
1058 nr_result++;
1059 if (found_pack) {
1060 entry->in_pack = found_pack;
1061 entry->in_pack_offset = found_offset;
1062 }
1063
1064 entry->no_try_delta = no_try_delta;
1065}
1066
1067static const char no_closure_warning[] = N_(("disabling bitmap writing, as some objects are not being packed"
)
1068"disabling bitmap writing, as some objects are not being packed"("disabling bitmap writing, as some objects are not being packed"
)
1069)("disabling bitmap writing, as some objects are not being packed"
);
1070
1071static int add_object_entry(const unsigned char *sha1, enum object_type type,
1072 const char *name, int exclude)
1073{
1074 struct packed_git *found_pack = NULL((void*)0);
1075 off_t found_offset = 0;
1076 uint32_t index_pos;
1077
1078 if (have_duplicate_entry(sha1, exclude, &index_pos))
1079 return 0;
1080
1081 if (!want_object_in_pack(sha1, exclude, &found_pack, &found_offset)) {
1082 /* The pack is missing an object, so it will not have closure */
1083 if (write_bitmap_index) {
1084 warning(_(no_closure_warning));
1085 write_bitmap_index = 0;
1086 }
1087 return 0;
1088 }
1089
1090 create_object_entry(sha1, type, pack_name_hash(name),
1091 exclude, name && no_try_delta(name),
1092 index_pos, found_pack, found_offset);
1093
1094 display_progress(progress_state, nr_result);
1095 return 1;
1096}
1097
1098static int add_object_entry_from_bitmap(const unsigned char *sha1,
1099 enum object_type type,
1100 int flags, uint32_t name_hash,
1101 struct packed_git *pack, off_t offset)
1102{
1103 uint32_t index_pos;
1104
1105 if (have_duplicate_entry(sha1, 0, &index_pos))
1106 return 0;
1107
1108 if (!want_object_in_pack(sha1, 0, &pack, &offset))
1109 return 0;
1110
1111 create_object_entry(sha1, type, name_hash, 0, 0, index_pos, pack, offset);
1112
1113 display_progress(progress_state, nr_result);
1114 return 1;
1115}
1116
1117struct pbase_tree_cache {
1118 unsigned char sha1[20];
1119 int ref;
1120 int temporary;
1121 void *tree_data;
1122 unsigned long tree_size;
1123};
1124
1125static struct pbase_tree_cache *(pbase_tree_cache[256]);
1126static int pbase_tree_cache_ix(const unsigned char *sha1)
1127{
1128 return sha1[0] % ARRAY_SIZE(pbase_tree_cache)(sizeof(pbase_tree_cache) / sizeof((pbase_tree_cache)[0]) + (
sizeof(char [1 - 2*!(!__builtin_types_compatible_p(__typeof__
(pbase_tree_cache), __typeof__(&(pbase_tree_cache)[0])))]
) - 1));
1129}
1130static int pbase_tree_cache_ix_incr(int ix)
1131{
1132 return (ix+1) % ARRAY_SIZE(pbase_tree_cache)(sizeof(pbase_tree_cache) / sizeof((pbase_tree_cache)[0]) + (
sizeof(char [1 - 2*!(!__builtin_types_compatible_p(__typeof__
(pbase_tree_cache), __typeof__(&(pbase_tree_cache)[0])))]
) - 1));
1133}
1134
1135static struct pbase_tree {
1136 struct pbase_tree *next;
1137 /* This is a phony "cache" entry; we are not
1138 * going to evict it or find it through _get()
1139 * mechanism -- this is for the toplevel node that
1140 * would almost always change with any commit.
1141 */
1142 struct pbase_tree_cache pcache;
1143} *pbase_tree;
1144
1145static struct pbase_tree_cache *pbase_tree_get(const unsigned char *sha1)
1146{
1147 struct pbase_tree_cache *ent, *nent;
1148 void *data;
1149 unsigned long size;
1150 enum object_type type;
1151 int neigh;
1152 int my_ix = pbase_tree_cache_ix(sha1);
1153 int available_ix = -1;
1154
1155 /* pbase-tree-cache acts as a limited hashtable.
1156 * your object will be found at your index or within a few
1157 * slots after that slot if it is cached.
1158 */
1159 for (neigh = 0; neigh < 8; neigh++) {
1160 ent = pbase_tree_cache[my_ix];
1161 if (ent && !hashcmp(ent->sha1, sha1)) {
1162 ent->ref++;
1163 return ent;
1164 }
1165 else if (((available_ix < 0) && (!ent || !ent->ref)) ||
1166 ((0 <= available_ix) &&
1167 (!ent && pbase_tree_cache[available_ix])))
1168 available_ix = my_ix;
1169 if (!ent)
1170 break;
1171 my_ix = pbase_tree_cache_ix_incr(my_ix);
1172 }
1173
1174 /* Did not find one. Either we got a bogus request or
1175 * we need to read and perhaps cache.
1176 */
1177 data = read_sha1_file(sha1, &type, &size);
1178 if (!data)
1179 return NULL((void*)0);
1180 if (type != OBJ_TREE) {
1181 free(data);
1182 return NULL((void*)0);
1183 }
1184
1185 /* We need to either cache or return a throwaway copy */
1186
1187 if (available_ix < 0)
1188 ent = NULL((void*)0);
1189 else {
1190 ent = pbase_tree_cache[available_ix];
1191 my_ix = available_ix;
1192 }
1193
1194 if (!ent) {
1195 nent = xmalloc(sizeof(*nent));
1196 nent->temporary = (available_ix < 0);
1197 }
1198 else {
1199 /* evict and reuse */
1200 free(ent->tree_data);
1201 nent = ent;
1202 }
1203 hashcpy(nent->sha1, sha1);
1204 nent->tree_data = data;
1205 nent->tree_size = size;
1206 nent->ref = 1;
1207 if (!nent->temporary)
1208 pbase_tree_cache[my_ix] = nent;
1209 return nent;
1210}
1211
1212static void pbase_tree_put(struct pbase_tree_cache *cache)
1213{
1214 if (!cache->temporary) {
1215 cache->ref--;
1216 return;
1217 }
1218 free(cache->tree_data);
1219 free(cache);
1220}
1221
1222static int name_cmp_len(const char *name)
1223{
1224 int i;
1225 for (i = 0; name[i] && name[i] != '\n' && name[i] != '/'; i++)
1226 ;
1227 return i;
1228}
1229
1230static void add_pbase_object(struct tree_desc *tree,
1231 const char *name,
1232 int cmplen,
1233 const char *fullname)
1234{
1235 struct name_entry entry;
1236 int cmp;
1237
1238 while (tree_entry(tree,&entry)) {
1239 if (S_ISGITLINK(entry.mode)(((entry.mode) & 0170000) == 0160000))
1240 continue;
1241 cmp = tree_entry_len(&entry) != cmplen ? 1 :
1242 memcmp(name, entry.path, cmplen);
1243 if (cmp > 0)
1244 continue;
1245 if (cmp < 0)
1246 return;
1247 if (name[cmplen] != '/') {
1248 add_object_entry(entry.oid->hash,
1249 object_type(entry.mode),
1250 fullname, 1);
1251 return;
1252 }
1253 if (S_ISDIR(entry.mode)(((entry.mode) & 0170000) == 0040000)) {
1254 struct tree_desc sub;
1255 struct pbase_tree_cache *tree;
1256 const char *down = name+cmplen+1;
1257 int downlen = name_cmp_len(down);
1258
1259 tree = pbase_tree_get(entry.oid->hash);
1260 if (!tree)
1261 return;
1262 init_tree_desc(&sub, tree->tree_data, tree->tree_size);
1263
1264 add_pbase_object(&sub, down, downlen, fullname);
1265 pbase_tree_put(tree);
1266 }
1267 }
1268}
1269
1270static unsigned *done_pbase_paths;
1271static int done_pbase_paths_num;
1272static int done_pbase_paths_alloc;
1273static int done_pbase_path_pos(unsigned hash)
1274{
1275 int lo = 0;
1276 int hi = done_pbase_paths_num;
1277 while (lo < hi) {
1278 int mi = (hi + lo) / 2;
1279 if (done_pbase_paths[mi] == hash)
1280 return mi;
1281 if (done_pbase_paths[mi] < hash)
1282 hi = mi;
1283 else
1284 lo = mi + 1;
1285 }
1286 return -lo-1;
1287}
1288
1289static int check_pbase_path(unsigned hash)
1290{
1291 int pos = (!done_pbase_paths) ? -1 : done_pbase_path_pos(hash);
5
←
Assuming 'done_pbase_paths' is null
→
6
←
Assuming pointer value is null
→
7
←
'?' condition is true
→
1292 if (0 <= pos)
8
←
Taking false branch
→
1293 return 1;
1294 pos = -pos - 1;
1295 ALLOC_GROW(done_pbase_paths,do { if ((done_pbase_paths_num + 1) > done_pbase_paths_alloc
) { if ((((done_pbase_paths_alloc)+16)*3/2) < (done_pbase_paths_num
+ 1)) done_pbase_paths_alloc = (done_pbase_paths_num + 1); else
done_pbase_paths_alloc = (((done_pbase_paths_alloc)+16)*3/2)
; (done_pbase_paths) = xrealloc((done_pbase_paths), st_mult(sizeof
(*(done_pbase_paths)), (done_pbase_paths_alloc))); } } while (
0)
1296 done_pbase_paths_num + 1,do { if ((done_pbase_paths_num + 1) > done_pbase_paths_alloc
) { if ((((done_pbase_paths_alloc)+16)*3/2) < (done_pbase_paths_num
+ 1)) done_pbase_paths_alloc = (done_pbase_paths_num + 1); else
done_pbase_paths_alloc = (((done_pbase_paths_alloc)+16)*3/2)
; (done_pbase_paths) = xrealloc((done_pbase_paths), st_mult(sizeof
(*(done_pbase_paths)), (done_pbase_paths_alloc))); } } while (
0)
1297 done_pbase_paths_alloc)do { if ((done_pbase_paths_num + 1) > done_pbase_paths_alloc
) { if ((((done_pbase_paths_alloc)+16)*3/2) < (done_pbase_paths_num
+ 1)) done_pbase_paths_alloc = (done_pbase_paths_num + 1); else
done_pbase_paths_alloc = (((done_pbase_paths_alloc)+16)*3/2)
; (done_pbase_paths) = xrealloc((done_pbase_paths), st_mult(sizeof
(*(done_pbase_paths)), (done_pbase_paths_alloc))); } } while (
0);
1298 done_pbase_paths_num++;
1299 if (pos < done_pbase_paths_num)
9
←
Assuming 'pos' is >= 'done_pbase_paths_num'
→
10
←
Taking false branch
→
1300 memmove(done_pbase_paths + pos + 1,__builtin___memmove_chk (done_pbase_paths + pos + 1, done_pbase_paths
+ pos, (done_pbase_paths_num - pos - 1) * sizeof(unsigned), __builtin_object_size
(done_pbase_paths + pos + 1, 0))
1301 done_pbase_paths + pos,__builtin___memmove_chk (done_pbase_paths + pos + 1, done_pbase_paths
+ pos, (done_pbase_paths_num - pos - 1) * sizeof(unsigned), __builtin_object_size
(done_pbase_paths + pos + 1, 0))
1302 (done_pbase_paths_num - pos - 1) * sizeof(unsigned))__builtin___memmove_chk (done_pbase_paths + pos + 1, done_pbase_paths
+ pos, (done_pbase_paths_num - pos - 1) * sizeof(unsigned), __builtin_object_size
(done_pbase_paths + pos + 1, 0));
1303 done_pbase_paths[pos] = hash;
11
←
Array access (from variable 'done_pbase_paths') results in a null pointer dereference
1304 return 0;
1305}
1306
1307static void add_preferred_base_object(const char *name)
1308{
1309 struct pbase_tree *it;
1310 int cmplen;
1311 unsigned hash = pack_name_hash(name);
2
←
Value assigned to 'done_pbase_paths'
→
1312
1313 if (!num_preferred_base || check_pbase_path(hash))
3
←
Assuming 'num_preferred_base' is not equal to 0
→
4
←
Calling 'check_pbase_path'
→
1314 return;
1315
1316 cmplen = name_cmp_len(name);
1317 for (it = pbase_tree; it; it = it->next) {
1318 if (cmplen == 0) {
1319 add_object_entry(it->pcache.sha1, OBJ_TREE, NULL((void*)0), 1);
1320 }
1321 else {
1322 struct tree_desc tree;
1323 init_tree_desc(&tree, it->pcache.tree_data, it->pcache.tree_size);
1324 add_pbase_object(&tree, name, cmplen, name);
1325 }
1326 }
1327}
1328
1329static void add_preferred_base(unsigned char *sha1)
1330{
1331 struct pbase_tree *it;
1332 void *data;
1333 unsigned long size;
1334 unsigned char tree_sha1[20];
1335
1336 if (window <= num_preferred_base++)
1337 return;
1338
1339 data = read_object_with_reference(sha1, tree_type, &size, tree_sha1);
1340 if (!data)
1341 return;
1342
1343 for (it = pbase_tree; it; it = it->next) {
1344 if (!hashcmp(it->pcache.sha1, tree_sha1)) {
1345 free(data);
1346 return;
1347 }
1348 }
1349
1350 it = xcalloc(1, sizeof(*it));
1351 it->next = pbase_tree;
1352 pbase_tree = it;
1353
1354 hashcpy(it->pcache.sha1, tree_sha1);
1355 it->pcache.tree_data = data;
1356 it->pcache.tree_size = size;
1357}
1358
1359static void cleanup_preferred_base(void)
1360{
1361 struct pbase_tree *it;
1362 unsigned i;
1363
1364 it = pbase_tree;
1365 pbase_tree = NULL((void*)0);
1366 while (it) {
1367 struct pbase_tree *this = it;
1368 it = this->next;
1369 free(this->pcache.tree_data);
1370 free(this);
1371 }
1372
1373 for (i = 0; i < ARRAY_SIZE(pbase_tree_cache)(sizeof(pbase_tree_cache) / sizeof((pbase_tree_cache)[0]) + (
sizeof(char [1 - 2*!(!__builtin_types_compatible_p(__typeof__
(pbase_tree_cache), __typeof__(&(pbase_tree_cache)[0])))]
) - 1)); i++) {
1374 if (!pbase_tree_cache[i])
1375 continue;
1376 free(pbase_tree_cache[i]->tree_data);
1377 free(pbase_tree_cache[i]);
1378 pbase_tree_cache[i] = NULL((void*)0);
1379 }
1380
1381 free(done_pbase_paths);
1382 done_pbase_paths = NULL((void*)0);
1383 done_pbase_paths_num = done_pbase_paths_alloc = 0;
1384}
1385
1386static void check_object(struct object_entry *entry)
1387{
1388 if (entry->in_pack) {
1389 struct packed_git *p = entry->in_pack;
1390 struct pack_window *w_curs = NULL((void*)0);
1391 const unsigned char *base_ref = NULL((void*)0);
1392 struct object_entry *base_entry;
1393 unsigned long used, used_0;
1394 unsigned long avail;
1395 off_t ofs;
1396 unsigned char *buf, c;
1397
1398 buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail);
1399
1400 /*
1401 * We want in_pack_type even if we do not reuse delta
1402 * since non-delta representations could still be reused.
1403 */
1404 used = unpack_object_header_buffer(buf, avail,
1405 &entry->in_pack_type,
1406 &entry->size);
1407 if (used == 0)
1408 goto give_up;
1409
1410 /*
1411 * Determine if this is a delta and if so whether we can
1412 * reuse it or not. Otherwise let's find out as cheaply as
1413 * possible what the actual type and size for this object is.
1414 */
1415 switch (entry->in_pack_type) {
1416 default:
1417 /* Not a delta hence we've already got all we need. */
1418 entry->type = entry->in_pack_type;
1419 entry->in_pack_header_size = used;
1420 if (entry->type < OBJ_COMMIT || entry->type > OBJ_BLOB)
1421 goto give_up;
1422 unuse_pack(&w_curs);
1423 return;
1424 case OBJ_REF_DELTA:
1425 if (reuse_delta && !entry->preferred_base)
1426 base_ref = use_pack(p, &w_curs,
1427 entry->in_pack_offset + used, NULL((void*)0));
1428 entry->in_pack_header_size = used + 20;
1429 break;
1430 case OBJ_OFS_DELTA:
1431 buf = use_pack(p, &w_curs,
1432 entry->in_pack_offset + used, NULL((void*)0));
1433 used_0 = 0;
1434 c = buf[used_0++];
1435 ofs = c & 127;
1436 while (c & 128) {
1437 ofs += 1;
1438 if (!ofs || MSB(ofs, 7)((ofs) & (__typeof__(ofs))(~0ULL << ((8 * sizeof(ofs
)) - (7))))) {
1439 error("delta base offset overflow in pack for %s",(error("delta base offset overflow in pack for %s", sha1_to_hex
(entry->idx.sha1)), const_error())
1440 sha1_to_hex(entry->idx.sha1))(error("delta base offset overflow in pack for %s", sha1_to_hex
(entry->idx.sha1)), const_error());
1441 goto give_up;
1442 }
1443 c = buf[used_0++];
1444 ofs = (ofs << 7) + (c & 127);
1445 }
1446 ofs = entry->in_pack_offset - ofs;
1447 if (ofs <= 0 || ofs >= entry->in_pack_offset) {
1448 error("delta base offset out of bound for %s",(error("delta base offset out of bound for %s", sha1_to_hex(entry
->idx.sha1)), const_error())
1449 sha1_to_hex(entry->idx.sha1))(error("delta base offset out of bound for %s", sha1_to_hex(entry
->idx.sha1)), const_error());
1450 goto give_up;
1451 }
1452 if (reuse_delta && !entry->preferred_base) {
1453 struct revindex_entry *revidx;
1454 revidx = find_pack_revindex(p, ofs);
1455 if (!revidx)
1456 goto give_up;
1457 base_ref = nth_packed_object_sha1(p, revidx->nr);
1458 }
1459 entry->in_pack_header_size = used + used_0;
1460 break;
1461 }
1462
1463 if (base_ref && (base_entry = packlist_find(&to_pack, base_ref, NULL((void*)0)))) {
1464 /*
1465 * If base_ref was set above that means we wish to
1466 * reuse delta data, and we even found that base
1467 * in the list of objects we want to pack. Goodie!
1468 *
1469 * Depth value does not matter - find_deltas() will
1470 * never consider reused delta as the base object to
1471 * deltify other objects against, in order to avoid
1472 * circular deltas.
1473 */
1474 entry->type = entry->in_pack_type;
1475 entry->delta = base_entry;
1476 entry->delta_size = entry->size;
1477 entry->delta_sibling = base_entry->delta_child;
1478 base_entry->delta_child = entry;
1479 unuse_pack(&w_curs);
1480 return;
1481 }
1482
1483 if (entry->type) {
1484 /*
1485 * This must be a delta and we already know what the
1486 * final object type is. Let's extract the actual
1487 * object size from the delta header.
1488 */
1489 entry->size = get_size_from_delta(p, &w_curs,
1490 entry->in_pack_offset + entry->in_pack_header_size);
1491 if (entry->size == 0)
1492 goto give_up;
1493 unuse_pack(&w_curs);
1494 return;
1495 }
1496
1497 /*
1498 * No choice but to fall back to the recursive delta walk
1499 * with sha1_object_info() to find about the object type
1500 * at this point...
1501 */
1502 give_up:
1503 unuse_pack(&w_curs);
1504 }
1505
1506 entry->type = sha1_object_info(entry->idx.sha1, &entry->size);
1507 /*
1508 * The error condition is checked in prepare_pack(). This is
1509 * to permit a missing preferred base object to be ignored
1510 * as a preferred base. Doing so can result in a larger
1511 * pack file, but the transfer will still take place.
1512 */
1513}
1514
1515static int pack_offset_sort(const void *_a, const void *_b)
1516{
1517 const struct object_entry *a = *(struct object_entry **)_a;
1518 const struct object_entry *b = *(struct object_entry **)_b;
1519
1520 /* avoid filesystem trashing with loose objects */
1521 if (!a->in_pack && !b->in_pack)
1522 return hashcmp(a->idx.sha1, b->idx.sha1);
1523
1524 if (a->in_pack < b->in_pack)
1525 return -1;
1526 if (a->in_pack > b->in_pack)
1527 return 1;
1528 return a->in_pack_offset < b->in_pack_offset ? -1 :
1529 (a->in_pack_offset > b->in_pack_offset);
1530}
1531
1532/*
1533 * Drop an on-disk delta we were planning to reuse. Naively, this would
1534 * just involve blanking out the "delta" field, but we have to deal
1535 * with some extra book-keeping:
1536 *
1537 * 1. Removing ourselves from the delta_sibling linked list.
1538 *
1539 * 2. Updating our size/type to the non-delta representation. These were
1540 * either not recorded initially (size) or overwritten with the delta type
1541 * (type) when check_object() decided to reuse the delta.
1542 */
1543static void drop_reused_delta(struct object_entry *entry)
1544{
1545 struct object_entry **p = &entry->delta->delta_child;
1546 struct object_info oi = OBJECT_INFO_INIT{((void*)0)};
1547
1548 while (*p) {
1549 if (*p == entry)
1550 *p = (*p)->delta_sibling;
1551 else
1552 p = &(*p)->delta_sibling;
1553 }
1554 entry->delta = NULL((void*)0);
1555
1556 oi.sizep = &entry->size;
1557 oi.typep = &entry->type;
1558 if (packed_object_info(entry->in_pack, entry->in_pack_offset, &oi) < 0) {
1559 /*
1560 * We failed to get the info from this pack for some reason;
1561 * fall back to sha1_object_info, which may find another copy.
1562 * And if that fails, the error will be recorded in entry->type
1563 * and dealt with in prepare_pack().
1564 */
1565 entry->type = sha1_object_info(entry->idx.sha1, &entry->size);
1566 }
1567}
1568
1569/*
1570 * Follow the chain of deltas from this entry onward, throwing away any links
1571 * that cause us to hit a cycle (as determined by the DFS state flags in
1572 * the entries).
1573 */
1574static void break_delta_chains(struct object_entry *entry)
1575{
1576 /* If it's not a delta, it can't be part of a cycle. */
1577 if (!entry->delta) {
1578 entry->dfs_state = DFS_DONE;
1579 return;
1580 }
1581
1582 switch (entry->dfs_state) {
1583 case DFS_NONE:
1584 /*
1585 * This is the first time we've seen the object. We mark it as
1586 * part of the active potential cycle and recurse.
1587 */
1588 entry->dfs_state = DFS_ACTIVE;
1589 break_delta_chains(entry->delta);
1590 entry->dfs_state = DFS_DONE;
1591 break;
1592
1593 case DFS_DONE:
1594 /* object already examined, and not part of a cycle */
1595 break;
1596
1597 case DFS_ACTIVE:
1598 /*
1599 * We found a cycle that needs broken. It would be correct to
1600 * break any link in the chain, but it's convenient to
1601 * break this one.
1602 */
1603 drop_reused_delta(entry);
1604 entry->dfs_state = DFS_DONE;
1605 break;
1606 }
1607}
1608
1609static void get_object_details(void)
1610{
1611 uint32_t i;
1612 struct object_entry **sorted_by_offset;
1613
1614 sorted_by_offset = xcalloc(to_pack.nr_objects, sizeof(struct object_entry *));
1615 for (i = 0; i < to_pack.nr_objects; i++)
1616 sorted_by_offset[i] = to_pack.objects + i;
1617 QSORT(sorted_by_offset, to_pack.nr_objects, pack_offset_sort)sane_qsort((sorted_by_offset), (to_pack.nr_objects), sizeof(*
(sorted_by_offset)), pack_offset_sort);
1618
1619 for (i = 0; i < to_pack.nr_objects; i++) {
1620 struct object_entry *entry = sorted_by_offset[i];
1621 check_object(entry);
1622 if (big_file_threshold < entry->size)
1623 entry->no_try_delta = 1;
1624 }
1625
1626 /*
1627 * This must happen in a second pass, since we rely on the delta
1628 * information for the whole list being completed.
1629 */
1630 for (i = 0; i < to_pack.nr_objects; i++)
1631 break_delta_chains(&to_pack.objects[i]);
1632
1633 free(sorted_by_offset);
1634}
1635
1636/*
1637 * We search for deltas in a list sorted by type, by filename hash, and then
1638 * by size, so that we see progressively smaller and smaller files.
1639 * That's because we prefer deltas to be from the bigger file
1640 * to the smaller -- deletes are potentially cheaper, but perhaps
1641 * more importantly, the bigger file is likely the more recent
1642 * one. The deepest deltas are therefore the oldest objects which are
1643 * less susceptible to be accessed often.
1644 */
1645static int type_size_sort(const void *_a, const void *_b)
1646{
1647 const struct object_entry *a = *(struct object_entry **)_a;
1648 const struct object_entry *b = *(struct object_entry **)_b;
1649
1650 if (a->type > b->type)
1651 return -1;
1652 if (a->type < b->type)
1653 return 1;
1654 if (a->hash > b->hash)
1655 return -1;
1656 if (a->hash < b->hash)
1657 return 1;
1658 if (a->preferred_base > b->preferred_base)
1659 return -1;
1660 if (a->preferred_base < b->preferred_base)
1661 return 1;
1662 if (a->size > b->size)
1663 return -1;
1664 if (a->size < b->size)
1665 return 1;
1666 return a < b ? -1 : (a > b); /* newest first */
1667}
1668
1669struct unpacked {
1670 struct object_entry *entry;
1671 void *data;
1672 struct delta_index *index;
1673 unsigned depth;
1674};
1675
1676static int delta_cacheable(unsigned long src_size, unsigned long trg_size,
1677 unsigned long delta_size)
1678{
1679 if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size)
1680 return 0;
1681
1682 if (delta_size < cache_max_small_delta_size)
1683 return 1;
1684
1685 /* cache delta, if objects are large enough compared to delta size */
1686 if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10))
1687 return 1;
1688
1689 return 0;
1690}
1691
1692#ifndef NO_PTHREADS
1693
1694static pthread_mutex_t read_mutex;
1695#define read_lock()pthread_mutex_lock(&read_mutex) pthread_mutex_lock(&read_mutex)
1696#define read_unlock()pthread_mutex_unlock(&read_mutex) pthread_mutex_unlock(&read_mutex)
1697
1698static pthread_mutex_t cache_mutex;
1699#define cache_lock()pthread_mutex_lock(&cache_mutex) pthread_mutex_lock(&cache_mutex)
1700#define cache_unlock()pthread_mutex_unlock(&cache_mutex) pthread_mutex_unlock(&cache_mutex)
1701
1702static pthread_mutex_t progress_mutex;
1703#define progress_lock()pthread_mutex_lock(&progress_mutex) pthread_mutex_lock(&progress_mutex)
1704#define progress_unlock()pthread_mutex_unlock(&progress_mutex) pthread_mutex_unlock(&progress_mutex)
1705
1706#else
1707
1708#define read_lock()pthread_mutex_lock(&read_mutex) (void)0
1709#define read_unlock()pthread_mutex_unlock(&read_mutex) (void)0
1710#define cache_lock()pthread_mutex_lock(&cache_mutex) (void)0
1711#define cache_unlock()pthread_mutex_unlock(&cache_mutex) (void)0
1712#define progress_lock()pthread_mutex_lock(&progress_mutex) (void)0
1713#define progress_unlock()pthread_mutex_unlock(&progress_mutex) (void)0
1714
1715#endif
1716
1717static int try_delta(struct unpacked *trg, struct unpacked *src,
1718 unsigned max_depth, unsigned long *mem_usage)
1719{
1720 struct object_entry *trg_entry = trg->entry;
1721 struct object_entry *src_entry = src->entry;
1722 unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
1723 unsigned ref_depth;
1724 enum object_type type;
1725 void *delta_buf;
1726
1727 /* Don't bother doing diffs between different types */
1728 if (trg_entry->type != src_entry->type)
1729 return -1;
1730
1731 /*
1732 * We do not bother to try a delta that we discarded on an
1733 * earlier try, but only when reusing delta data. Note that
1734 * src_entry that is marked as the preferred_base should always
1735 * be considered, as even if we produce a suboptimal delta against
1736 * it, we will still save the transfer cost, as we already know
1737 * the other side has it and we won't send src_entry at all.
1738 */
1739 if (reuse_delta && trg_entry->in_pack &&
1740 trg_entry->in_pack == src_entry->in_pack &&
1741 !src_entry->preferred_base &&
1742 trg_entry->in_pack_type != OBJ_REF_DELTA &&
1743 trg_entry->in_pack_type != OBJ_OFS_DELTA)
1744 return 0;
1745
1746 /* Let's not bust the allowed depth. */
1747 if (src->depth >= max_depth)
1748 return 0;
1749
1750 /* Now some size filtering heuristics. */
1751 trg_size = trg_entry->size;
1752 if (!trg_entry->delta) {
1753 max_size = trg_size/2 - 20;
1754 ref_depth = 1;
1755 } else {
1756 max_size = trg_entry->delta_size;
1757 ref_depth = trg->depth;
1758 }
1759 max_size = (uint64_t)max_size * (max_depth - src->depth) /
1760 (max_depth - ref_depth + 1);
1761 if (max_size == 0)
1762 return 0;
1763 src_size = src_entry->size;
1764 sizediff = src_size < trg_size ? trg_size - src_size : 0;
1765 if (sizediff >= max_size)
1766 return 0;
1767 if (trg_size < src_size / 32)
1768 return 0;
1769
1770 /* Load data if not already done */
1771 if (!trg->data) {
1772 read_lock()pthread_mutex_lock(&read_mutex);
1773 trg->data = read_sha1_file(trg_entry->idx.sha1, &type, &sz);
1774 read_unlock()pthread_mutex_unlock(&read_mutex);
1775 if (!trg->data)
1776 die("object %s cannot be read",
1777 sha1_to_hex(trg_entry->idx.sha1));
1778 if (sz != trg_size)
1779 die("object %s inconsistent object length (%lu vs %lu)",
1780 sha1_to_hex(trg_entry->idx.sha1), sz, trg_size);
1781 *mem_usage += sz;
1782 }
1783 if (!src->data) {
1784 read_lock()pthread_mutex_lock(&read_mutex);
1785 src->data = read_sha1_file(src_entry->idx.sha1, &type, &sz);
1786 read_unlock()pthread_mutex_unlock(&read_mutex);
1787 if (!src->data) {
1788 if (src_entry->preferred_base) {
1789 static int warned = 0;
1790 if (!warned++)
1791 warning("object %s cannot be read",
1792 sha1_to_hex(src_entry->idx.sha1));
1793 /*
1794 * Those objects are not included in the
1795 * resulting pack. Be resilient and ignore
1796 * them if they can't be read, in case the
1797 * pack could be created nevertheless.
1798 */
1799 return 0;
1800 }
1801 die("object %s cannot be read",
1802 sha1_to_hex(src_entry->idx.sha1));
1803 }
1804 if (sz != src_size)
1805 die("object %s inconsistent object length (%lu vs %lu)",
1806 sha1_to_hex(src_entry->idx.sha1), sz, src_size);
1807 *mem_usage += sz;
1808 }
1809 if (!src->index) {
1810 src->index = create_delta_index(src->data, src_size);
1811 if (!src->index) {
1812 static int warned = 0;
1813 if (!warned++)
1814 warning("suboptimal pack - out of memory");
1815 return 0;
1816 }
1817 *mem_usage += sizeof_delta_index(src->index);
1818 }
1819
1820 delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
1821 if (!delta_buf)
1822 return 0;
1823
1824 if (trg_entry->delta) {
1825 /* Prefer only shallower same-sized deltas. */
1826 if (delta_size == trg_entry->delta_size &&
1827 src->depth + 1 >= trg->depth) {
1828 free(delta_buf);
1829 return 0;
1830 }
1831 }
1832
1833 /*
1834 * Handle memory allocation outside of the cache
1835 * accounting lock. Compiler will optimize the strangeness
1836 * away when NO_PTHREADS is defined.
1837 */
1838 free(trg_entry->delta_data);
1839 cache_lock()pthread_mutex_lock(&cache_mutex);
1840 if (trg_entry->delta_data) {
1841 delta_cache_size -= trg_entry->delta_size;
1842 trg_entry->delta_data = NULL((void*)0);
1843 }
1844 if (delta_cacheable(src_size, trg_size, delta_size)) {
1845 delta_cache_size += delta_size;
1846 cache_unlock()pthread_mutex_unlock(&cache_mutex);
1847 trg_entry->delta_data = xrealloc(delta_buf, delta_size);
1848 } else {
1849 cache_unlock()pthread_mutex_unlock(&cache_mutex);
1850 free(delta_buf);
1851 }
1852
1853 trg_entry->delta = src_entry;
1854 trg_entry->delta_size = delta_size;
1855 trg->depth = src->depth + 1;
1856
1857 return 1;
1858}
1859
1860static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
1861{
1862 struct object_entry *child = me->delta_child;
1863 unsigned int m = n;
1864 while (child) {
1865 unsigned int c = check_delta_limit(child, n + 1);
1866 if (m < c)
1867 m = c;
1868 child = child->delta_sibling;
1869 }
1870 return m;
1871}
1872
1873static unsigned long free_unpacked(struct unpacked *n)
1874{
1875 unsigned long freed_mem = sizeof_delta_index(n->index);
1876 free_delta_index(n->index);
1877 n->index = NULL((void*)0);
1878 if (n->data) {
1879 freed_mem += n->entry->size;
1880 free(n->data);
1881 n->data = NULL((void*)0);
1882 }
1883 n->entry = NULL((void*)0);
1884 n->depth = 0;
1885 return freed_mem;
1886}
1887
1888static void find_deltas(struct object_entry **list, unsigned *list_size,
1889 int window, int depth, unsigned *processed)
1890{
1891 uint32_t i, idx = 0, count = 0;
1892 struct unpacked *array;
1893 unsigned long mem_usage = 0;
1894
1895 array = xcalloc(window, sizeof(struct unpacked));
1896
1897 for (;;) {
1898 struct object_entry *entry;
1899 struct unpacked *n = array + idx;
1900 int j, max_depth, best_base = -1;
1901
1902 progress_lock()pthread_mutex_lock(&progress_mutex);
1903 if (!*list_size) {
1904 progress_unlock()pthread_mutex_unlock(&progress_mutex);
1905 break;
1906 }
1907 entry = *list++;
1908 (*list_size)--;
1909 if (!entry->preferred_base) {
1910 (*processed)++;
1911 display_progress(progress_state, *processed);
1912 }
1913 progress_unlock()pthread_mutex_unlock(&progress_mutex);
1914
1915 mem_usage -= free_unpacked(n);
1916 n->entry = entry;
1917
1918 while (window_memory_limit &&
1919 mem_usage > window_memory_limit &&
1920 count > 1) {
1921 uint32_t tail = (idx + window - count) % window;
1922 mem_usage -= free_unpacked(array + tail);
1923 count--;
1924 }
1925
1926 /* We do not compute delta to *create* objects we are not
1927 * going to pack.
1928 */
1929 if (entry->preferred_base)
1930 goto next;
1931
1932 /*
1933 * If the current object is at pack edge, take the depth the
1934 * objects that depend on the current object into account
1935 * otherwise they would become too deep.
1936 */
1937 max_depth = depth;
1938 if (entry->delta_child) {
1939 max_depth -= check_delta_limit(entry, 0);
1940 if (max_depth <= 0)
1941 goto next;
1942 }
1943
1944 j = window;
1945 while (--j > 0) {
1946 int ret;
1947 uint32_t other_idx = idx + j;
1948 struct unpacked *m;
1949 if (other_idx >= window)
1950 other_idx -= window;
1951 m = array + other_idx;
1952 if (!m->entry)
1953 break;
1954 ret = try_delta(n, m, max_depth, &mem_usage);
1955 if (ret < 0)
1956 break;
1957 else if (ret > 0)
1958 best_base = other_idx;
1959 }
1960
1961 /*
1962 * If we decided to cache the delta data, then it is best
1963 * to compress it right away. First because we have to do
1964 * it anyway, and doing it here while we're threaded will
1965 * save a lot of time in the non threaded write phase,
1966 * as well as allow for caching more deltas within
1967 * the same cache size limit.
1968 * ...
1969 * But only if not writing to stdout, since in that case
1970 * the network is most likely throttling writes anyway,
1971 * and therefore it is best to go to the write phase ASAP
1972 * instead, as we can afford spending more time compressing
1973 * between writes at that moment.
1974 */
1975 if (entry->delta_data && !pack_to_stdout) {
1976 entry->z_delta_size = do_compress(&entry->delta_data,
1977 entry->delta_size);
1978 cache_lock()pthread_mutex_lock(&cache_mutex);
1979 delta_cache_size -= entry->delta_size;
1980 delta_cache_size += entry->z_delta_size;
1981 cache_unlock()pthread_mutex_unlock(&cache_mutex);
1982 }
1983
1984 /* if we made n a delta, and if n is already at max
1985 * depth, leaving it in the window is pointless. we
1986 * should evict it first.
1987 */
1988 if (entry->delta && max_depth <= n->depth)
1989 continue;
1990
1991 /*
1992 * Move the best delta base up in the window, after the
1993 * currently deltified object, to keep it longer. It will
1994 * be the first base object to be attempted next.
1995 */
1996 if (entry->delta) {
1997 struct unpacked swap = array[best_base];
1998 int dist = (window + idx - best_base) % window;
1999 int dst = best_base;
2000 while (dist--) {
2001 int src = (dst + 1) % window;
2002 array[dst] = array[src];
2003 dst = src;
2004 }
2005 array[dst] = swap;
2006 }
2007
2008 next:
2009 idx++;
2010 if (count + 1 < window)
2011 count++;
2012 if (idx >= window)
2013 idx = 0;
2014 }
2015
2016 for (i = 0; i < window; ++i) {
2017 free_delta_index(array[i].index);
2018 free(array[i].data);
2019 }
2020 free(array);
2021}
2022
2023#ifndef NO_PTHREADS
2024
2025static void try_to_free_from_threads(size_t size)
2026{
2027 read_lock()pthread_mutex_lock(&read_mutex);
2028 release_pack_memory(size);
2029 read_unlock()pthread_mutex_unlock(&read_mutex);
2030}
2031
2032static try_to_free_t old_try_to_free_routine;
2033
2034/*
2035 * The main thread waits on the condition that (at least) one of the workers
2036 * has stopped working (which is indicated in the .working member of
2037 * struct thread_params).
2038 * When a work thread has completed its work, it sets .working to 0 and
2039 * signals the main thread and waits on the condition that .data_ready
2040 * becomes 1.
2041 */
2042
2043struct thread_params {
2044 pthread_t thread;
2045 struct object_entry **list;
2046 unsigned list_size;
2047 unsigned remaining;
2048 int window;
2049 int depth;
2050 int working;
2051 int data_ready;
2052 pthread_mutex_t mutex;
2053 pthread_cond_t cond;
2054 unsigned *processed;
2055};
2056
2057static pthread_cond_t progress_cond;
2058
2059/*
2060 * Mutex and conditional variable can't be statically-initialized on Windows.
2061 */
2062static void init_threaded_search(void)
2063{
2064 init_recursive_mutex(&read_mutex);
2065 pthread_mutex_init(&cache_mutex, NULL((void*)0));
2066 pthread_mutex_init(&progress_mutex, NULL((void*)0));
2067 pthread_cond_init(&progress_cond, NULL((void*)0));
2068 old_try_to_free_routine = set_try_to_free_routine(try_to_free_from_threads);
2069}
2070
2071static void cleanup_threaded_search(void)
2072{
2073 set_try_to_free_routine(old_try_to_free_routine);
2074 pthread_cond_destroy(&progress_cond);
2075 pthread_mutex_destroy(&read_mutex);
2076 pthread_mutex_destroy(&cache_mutex);
2077 pthread_mutex_destroy(&progress_mutex);
2078}
2079
2080static void *threaded_find_deltas(void *arg)
2081{
2082 struct thread_params *me = arg;
2083
2084 while (me->remaining) {
2085 find_deltas(me->list, &me->remaining,
2086 me->window, me->depth, me->processed);
2087
2088 progress_lock()pthread_mutex_lock(&progress_mutex);
2089 me->working = 0;
2090 pthread_cond_signal(&progress_cond);
2091 progress_unlock()pthread_mutex_unlock(&progress_mutex);
2092
2093 /*
2094 * We must not set ->data_ready before we wait on the
2095 * condition because the main thread may have set it to 1
2096 * before we get here. In order to be sure that new
2097 * work is available if we see 1 in ->data_ready, it
2098 * was initialized to 0 before this thread was spawned
2099 * and we reset it to 0 right away.
2100 */
2101 pthread_mutex_lock(&me->mutex);
2102 while (!me->data_ready)
2103 pthread_cond_wait(&me->cond, &me->mutex);
2104 me->data_ready = 0;
2105 pthread_mutex_unlock(&me->mutex);
2106 }
2107 /* leave ->working 1 so that this doesn't get more work assigned */
2108 return NULL((void*)0);
2109}
2110
2111static void ll_find_deltas(struct object_entry **list, unsigned list_size,
2112 int window, int depth, unsigned *processed)
2113{
2114 struct thread_params *p;
2115 int i, ret, active_threads = 0;
2116
2117 init_threaded_search();
2118
2119 if (delta_search_threads <= 1) {
2120 find_deltas(list, &list_size, window, depth, processed);
2121 cleanup_threaded_search();
2122 return;
2123 }
2124 if (progress > pack_to_stdout)
2125 fprintf(stderr__stderrp, "Delta compression using up to %d threads.\n",
2126 delta_search_threads);
2127 p = xcalloc(delta_search_threads, sizeof(*p));
2128
2129 /* Partition the work amongst work threads. */
2130 for (i = 0; i < delta_search_threads; i++) {
2131 unsigned sub_size = list_size / (delta_search_threads - i);
2132
2133 /* don't use too small segments or no deltas will be found */
2134 if (sub_size < 2*window && i+1 < delta_search_threads)
2135 sub_size = 0;
2136
2137 p[i].window = window;
2138 p[i].depth = depth;
2139 p[i].processed = processed;
2140 p[i].working = 1;
2141 p[i].data_ready = 0;
2142
2143 /* try to split chunks on "path" boundaries */
2144 while (sub_size && sub_size < list_size &&
2145 list[sub_size]->hash &&
2146 list[sub_size]->hash == list[sub_size-1]->hash)
2147 sub_size++;
2148
2149 p[i].list = list;
2150 p[i].list_size = sub_size;
2151 p[i].remaining = sub_size;
2152
2153 list += sub_size;
2154 list_size -= sub_size;
2155 }
2156
2157 /* Start work threads. */
2158 for (i = 0; i < delta_search_threads; i++) {
2159 if (!p[i].list_size)
2160 continue;
2161 pthread_mutex_init(&p[i].mutex, NULL((void*)0));
2162 pthread_cond_init(&p[i].cond, NULL((void*)0));
2163 ret = pthread_create(&p[i].thread, NULL((void*)0),
2164 threaded_find_deltas, &p[i]);
2165 if (ret)
2166 die("unable to create thread: %s", strerror(ret));
2167 active_threads++;
2168 }
2169
2170 /*
2171 * Now let's wait for work completion. Each time a thread is done
2172 * with its work, we steal half of the remaining work from the
2173 * thread with the largest number of unprocessed objects and give
2174 * it to that newly idle thread. This ensure good load balancing
2175 * until the remaining object list segments are simply too short
2176 * to be worth splitting anymore.
2177 */
2178 while (active_threads) {
2179 struct thread_params *target = NULL((void*)0);
2180 struct thread_params *victim = NULL((void*)0);
2181 unsigned sub_size = 0;
2182
2183 progress_lock()pthread_mutex_lock(&progress_mutex);
2184 for (;;) {
2185 for (i = 0; !target && i < delta_search_threads; i++)
2186 if (!p[i].working)
2187 target = &p[i];
2188 if (target)
2189 break;
2190 pthread_cond_wait(&progress_cond, &progress_mutex);
2191 }
2192
2193 for (i = 0; i < delta_search_threads; i++)
2194 if (p[i].remaining > 2*window &&
2195 (!victim || victim->remaining < p[i].remaining))
2196 victim = &p[i];
2197 if (victim) {
2198 sub_size = victim->remaining / 2;
2199 list = victim->list + victim->list_size - sub_size;
2200 while (sub_size && list[0]->hash &&
2201 list[0]->hash == list[-1]->hash) {
2202 list++;
2203 sub_size--;
2204 }
2205 if (!sub_size) {
2206 /*
2207 * It is possible for some "paths" to have
2208 * so many objects that no hash boundary
2209 * might be found. Let's just steal the
2210 * exact half in that case.
2211 */
2212 sub_size = victim->remaining / 2;
2213 list -= sub_size;
2214 }
2215 target->list = list;
2216 victim->list_size -= sub_size;
2217 victim->remaining -= sub_size;
2218 }
2219 target->list_size = sub_size;
2220 target->remaining = sub_size;
2221 target->working = 1;
2222 progress_unlock()pthread_mutex_unlock(&progress_mutex);
2223
2224 pthread_mutex_lock(&target->mutex);
2225 target->data_ready = 1;
2226 pthread_cond_signal(&target->cond);
2227 pthread_mutex_unlock(&target->mutex);
2228
2229 if (!sub_size) {
2230 pthread_join(target->thread, NULL((void*)0));
2231 pthread_cond_destroy(&target->cond);
2232 pthread_mutex_destroy(&target->mutex);
2233 active_threads--;
2234 }
2235 }
2236 cleanup_threaded_search();
2237 free(p);
2238}
2239
2240#else
2241#define ll_find_deltas(l, s, w, d, p) find_deltas(l, &s, w, d, p)
2242#endif
2243
2244static void add_tag_chain(const struct object_id *oid)
2245{
2246 struct tag *tag;
2247
2248 /*
2249 * We catch duplicates already in add_object_entry(), but we'd
2250 * prefer to do this extra check to avoid having to parse the
2251 * tag at all if we already know that it's being packed (e.g., if
2252 * it was included via bitmaps, we would not have parsed it
2253 * previously).
2254 */
2255 if (packlist_find(&to_pack, oid->hash, NULL((void*)0)))
2256 return;
2257
2258 tag = lookup_tag(oid->hash);
2259 while (1) {
2260 if (!tag || parse_tag(tag) || !tag->tagged)
2261 die("unable to pack objects reachable from tag %s",
2262 oid_to_hex(oid));
2263
2264 add_object_entry(tag->object.oid.hash, OBJ_TAG, NULL((void*)0), 0);
2265
2266 if (tag->tagged->type != OBJ_TAG)
2267 return;
2268
2269 tag = (struct tag *)tag->tagged;
2270 }
2271}
2272
2273static int add_ref_tag(const char *path, const struct object_id *oid, int flag, void *cb_data)
2274{
2275 struct object_id peeled;
2276
2277 if (starts_with(path, "refs/tags/") && /* is a tag? */
2278 !peel_ref(path, peeled.hash) && /* peelable? */
2279 packlist_find(&to_pack, peeled.hash, NULL((void*)0))) /* object packed? */
2280 add_tag_chain(oid);
2281 return 0;
2282}
2283
2284static void prepare_pack(int window, int depth)
2285{
2286 struct object_entry **delta_list;
2287 uint32_t i, nr_deltas;
2288 unsigned n;
2289
2290 get_object_details();
2291
2292 /*
2293 * If we're locally repacking then we need to be doubly careful
2294 * from now on in order to make sure no stealth corruption gets
2295 * propagated to the new pack. Clients receiving streamed packs
2296 * should validate everything they get anyway so no need to incur
2297 * the additional cost here in that case.
2298 */
2299 if (!pack_to_stdout)
2300 do_check_packed_object_crc = 1;
2301
2302 if (!to_pack.nr_objects || !window || !depth)
2303 return;
2304
2305 ALLOC_ARRAY(delta_list, to_pack.nr_objects)(delta_list) = xmalloc(st_mult(sizeof(*(delta_list)), (to_pack
.nr_objects)));
2306 nr_deltas = n = 0;
2307
2308 for (i = 0; i < to_pack.nr_objects; i++) {
2309 struct object_entry *entry = to_pack.objects + i;
2310
2311 if (entry->delta)
2312 /* This happens if we decided to reuse existing
2313 * delta from a pack. "reuse_delta &&" is implied.
2314 */
2315 continue;
2316
2317 if (entry->size < 50)
2318 continue;
2319
2320 if (entry->no_try_delta)
2321 continue;
2322
2323 if (!entry->preferred_base) {
2324 nr_deltas++;
2325 if (entry->type < 0)
2326 die("unable to get type of object %s",
2327 sha1_to_hex(entry->idx.sha1));
2328 } else {
2329 if (entry->type < 0) {
2330 /*
2331 * This object is not found, but we
2332 * don't have to include it anyway.
2333 */
2334 continue;
2335 }
2336 }
2337
2338 delta_list[n++] = entry;
2339 }
2340
2341 if (nr_deltas && n > 1) {
2342 unsigned nr_done = 0;
2343 if (progress)
2344 progress_state = start_progress(_("Compressing objects"),
2345 nr_deltas);
2346 QSORT(delta_list, n, type_size_sort)sane_qsort((delta_list), (n), sizeof(*(delta_list)), type_size_sort
);
2347 ll_find_deltas(delta_list, n, window+1, depth, &nr_done);
2348 stop_progress(&progress_state);
2349 if (nr_done != nr_deltas)
2350 die("inconsistency with delta count");
2351 }
2352 free(delta_list);
2353}
2354
2355static int git_pack_config(const char *k, const char *v, void *cb)
2356{
2357 if (!strcmp(k, "pack.window")) {
2358 window = git_config_int(k, v);
2359 return 0;
2360 }
2361 if (!strcmp(k, "pack.windowmemory")) {
2362 window_memory_limit = git_config_ulong(k, v);
2363 return 0;
2364 }
2365 if (!strcmp(k, "pack.depth")) {
2366 depth = git_config_int(k, v);
2367 return 0;
2368 }
2369 if (!strcmp(k, "pack.deltacachesize")) {
2370 max_delta_cache_size = git_config_int(k, v);
2371 return 0;
2372 }
2373 if (!strcmp(k, "pack.deltacachelimit")) {
2374 cache_max_small_delta_size = git_config_int(k, v);
2375 return 0;
2376 }
2377 if (!strcmp(k, "pack.writebitmaphashcache")) {
2378 if (git_config_bool(k, v))
2379 write_bitmap_options |= BITMAP_OPT_HASH_CACHE;
2380 else
2381 write_bitmap_options &= ~BITMAP_OPT_HASH_CACHE;
2382 }
2383 if (!strcmp(k, "pack.usebitmaps")) {
2384 use_bitmap_index_default = git_config_bool(k, v);
2385 return 0;
2386 }
2387 if (!strcmp(k, "pack.threads")) {
2388 delta_search_threads = git_config_int(k, v);
2389 if (delta_search_threads < 0)
2390 die("invalid number of threads specified (%d)",
2391 delta_search_threads);
2392#ifdef NO_PTHREADS
2393 if (delta_search_threads != 1)
2394 warning("no threads support, ignoring %s", k);
2395#endif
2396 return 0;
2397 }
2398 if (!strcmp(k, "pack.indexversion")) {
2399 pack_idx_opts.version = git_config_int(k, v);
2400 if (pack_idx_opts.version > 2)
2401 die("bad pack.indexversion=%"PRIu32"u",
2402 pack_idx_opts.version);
2403 return 0;
2404 }
2405 return git_default_config(k, v, cb);
2406}
2407
2408static void read_object_list_from_stdin(void)
2409{
2410 char line[40 + 1 + PATH_MAX1024 + 2];
2411 unsigned char sha1[20];
2412
2413 for (;;) {
2414 if (!fgets(line, sizeof(line), stdin__stdinp)) {
2415 if (feof(stdin__stdinp))
2416 break;
2417 if (!ferror(stdin__stdinp))
2418 die("fgets returned NULL, not EOF, not error!");
2419 if (errno(*__error()) != EINTR4)
2420 die_errno("fgets");
2421 clearerr(stdin__stdinp);
2422 continue;
2423 }
2424 if (line[0] == '-') {
2425 if (get_sha1_hex(line+1, sha1))
2426 die("expected edge sha1, got garbage:\n %s",
2427 line);
2428 add_preferred_base(sha1);
2429 continue;
2430 }
2431 if (get_sha1_hex(line, sha1))
2432 die("expected sha1, got garbage:\n %s", line);
2433
2434 add_preferred_base_object(line+41);
2435 add_object_entry(sha1, 0, line+41, 0);
2436 }
2437}
2438
2439#define OBJECT_ADDED(1u<<20) (1u<<20)
2440
2441static void show_commit(struct commit *commit, void *data)
2442{
2443 add_object_entry(commit->object.oid.hash, OBJ_COMMIT, NULL((void*)0), 0);
2444 commit->object.flags |= OBJECT_ADDED(1u<<20);
2445
2446 if (write_bitmap_index)
2447 index_commit_for_bitmap(commit);
2448}
2449
2450static void show_object(struct object *obj, const char *name, void *data)
2451{
2452 add_preferred_base_object(name);
1
Calling 'add_preferred_base_object'
→
2453 add_object_entry(obj->oid.hash, obj->type, name, 0);
2454 obj->flags |= OBJECT_ADDED(1u<<20);
2455}
2456
2457static void show_edge(struct commit *commit)
2458{
2459 add_preferred_base(commit->object.oid.hash);
2460}
2461
2462struct in_pack_object {
2463 off_t offset;
2464 struct object *object;
2465};
2466
2467struct in_pack {
2468 int alloc;
2469 int nr;
2470 struct in_pack_object *array;
2471};
2472
2473static void mark_in_pack_object(struct object *object, struct packed_git *p, struct in_pack *in_pack)
2474{
2475 in_pack->array[in_pack->nr].offset = find_pack_entry_one(object->oid.hash, p);
2476 in_pack->array[in_pack->nr].object = object;
2477 in_pack->nr++;
2478}
2479
2480/*
2481 * Compare the objects in the offset order, in order to emulate the
2482 * "git rev-list --objects" output that produced the pack originally.
2483 */
2484static int ofscmp(const void *a_, const void *b_)
2485{
2486 struct in_pack_object *a = (struct in_pack_object *)a_;
2487 struct in_pack_object *b = (struct in_pack_object *)b_;
2488
2489 if (a->offset < b->offset)
2490 return -1;
2491 else if (a->offset > b->offset)
2492 return 1;
2493 else
2494 return oidcmp(&a->object->oid, &b->object->oid);
2495}
2496
2497static void add_objects_in_unpacked_packs(struct rev_info *revs)
2498{
2499 struct packed_git *p;
2500 struct in_pack in_pack;
2501 uint32_t i;
2502
2503 memset(&in_pack, 0, sizeof(in_pack))__builtin___memset_chk (&in_pack, 0, sizeof(in_pack), __builtin_object_size
(&in_pack, 0));
2504
2505 for (p = packed_git; p; p = p->next) {
2506 const unsigned char *sha1;
2507 struct object *o;
2508
2509 if (!p->pack_local || p->pack_keep)
2510 continue;
2511 if (open_pack_index(p))
2512 die("cannot open pack index");
2513
2514 ALLOC_GROW(in_pack.array,do { if ((in_pack.nr + p->num_objects) > in_pack.alloc)
{ if ((((in_pack.alloc)+16)*3/2) < (in_pack.nr + p->num_objects
)) in_pack.alloc = (in_pack.nr + p->num_objects); else in_pack
.alloc = (((in_pack.alloc)+16)*3/2); (in_pack.array) = xrealloc
((in_pack.array), st_mult(sizeof(*(in_pack.array)), (in_pack.
alloc))); } } while (0)
2515 in_pack.nr + p->num_objects,do { if ((in_pack.nr + p->num_objects) > in_pack.alloc)
{ if ((((in_pack.alloc)+16)*3/2) < (in_pack.nr + p->num_objects
)) in_pack.alloc = (in_pack.nr + p->num_objects); else in_pack
.alloc = (((in_pack.alloc)+16)*3/2); (in_pack.array) = xrealloc
((in_pack.array), st_mult(sizeof(*(in_pack.array)), (in_pack.
alloc))); } } while (0)
2516 in_pack.alloc)do { if ((in_pack.nr + p->num_objects) > in_pack.alloc)
{ if ((((in_pack.alloc)+16)*3/2) < (in_pack.nr + p->num_objects
)) in_pack.alloc = (in_pack.nr + p->num_objects); else in_pack
.alloc = (((in_pack.alloc)+16)*3/2); (in_pack.array) = xrealloc
((in_pack.array), st_mult(sizeof(*(in_pack.array)), (in_pack.
alloc))); } } while (0);
2517
2518 for (i = 0; i < p->num_objects; i++) {
2519 sha1 = nth_packed_object_sha1(p, i);
2520 o = lookup_unknown_object(sha1);
2521 if (!(o->flags & OBJECT_ADDED(1u<<20)))
2522 mark_in_pack_object(o, p, &in_pack);
2523 o->flags |= OBJECT_ADDED(1u<<20);
2524 }
2525 }
2526
2527 if (in_pack.nr) {
2528 QSORT(in_pack.array, in_pack.nr, ofscmp)sane_qsort((in_pack.array), (in_pack.nr), sizeof(*(in_pack.array
)), ofscmp);
2529 for (i = 0; i < in_pack.nr; i++) {
2530 struct object *o = in_pack.array[i].object;
2531 add_object_entry(o->oid.hash, o->type, "", 0);
2532 }
2533 }
2534 free(in_pack.array);
2535}
2536
2537static int add_loose_object(const unsigned char *sha1, const char *path,
2538 void *data)
2539{
2540 enum object_type type = sha1_object_info(sha1, NULL((void*)0));
2541
2542 if (type < 0) {
2543 warning("loose object at %s could not be examined", path);
2544 return 0;
2545 }
2546
2547 add_object_entry(sha1, type, "", 0);
2548 return 0;
2549}
2550
2551/*
2552 * We actually don't even have to worry about reachability here.
2553 * add_object_entry will weed out duplicates, so we just add every
2554 * loose object we find.
2555 */
2556static void add_unreachable_loose_objects(void)
2557{
2558 for_each_loose_file_in_objdir(get_object_directory(),
2559 add_loose_object,
2560 NULL((void*)0), NULL((void*)0), NULL((void*)0));
2561}
2562
2563static int has_sha1_pack_kept_or_nonlocal(const unsigned char *sha1)
2564{
2565 static struct packed_git *last_found = (void *)1;
2566 struct packed_git *p;
2567
2568 p = (last_found != (void *)1) ? last_found : packed_git;
2569
2570 while (p) {
2571 if ((!p->pack_local || p->pack_keep) &&
2572 find_pack_entry_one(sha1, p)) {
2573 last_found = p;
2574 return 1;
2575 }
2576 if (p == last_found)
2577 p = packed_git;
2578 else
2579 p = p->next;
2580 if (p == last_found)
2581 p = p->next;
2582 }
2583 return 0;
2584}
2585
2586/*
2587 * Store a list of sha1s that are should not be discarded
2588 * because they are either written too recently, or are
2589 * reachable from another object that was.
2590 *
2591 * This is filled by get_object_list.
2592 */
2593static struct sha1_array recent_objects;
2594
2595static int loosened_object_can_be_discarded(const unsigned char *sha1,
2596 unsigned long mtime)
2597{
2598 if (!unpack_unreachable_expiration)
2599 return 0;
2600 if (mtime > unpack_unreachable_expiration)
2601 return 0;
2602 if (sha1_array_lookup(&recent_objects, sha1) >= 0)
2603 return 0;
2604 return 1;
2605}
2606
2607static void loosen_unused_packed_objects(struct rev_info *revs)
2608{
2609 struct packed_git *p;
2610 uint32_t i;
2611 const unsigned char *sha1;
2612
2613 for (p = packed_git; p; p = p->next) {
2614 if (!p->pack_local || p->pack_keep)
2615 continue;
2616
2617 if (open_pack_index(p))
2618 die("cannot open pack index");
2619
2620 for (i = 0; i < p->num_objects; i++) {
2621 sha1 = nth_packed_object_sha1(p, i);
2622 if (!packlist_find(&to_pack, sha1, NULL((void*)0)) &&
2623 !has_sha1_pack_kept_or_nonlocal(sha1) &&
2624 !loosened_object_can_be_discarded(sha1, p->mtime))
2625 if (force_object_loose(sha1, p->mtime))
2626 die("unable to force loose object");
2627 }
2628 }
2629}
2630
2631/*
2632 * This tracks any options which pack-reuse code expects to be on, or which a
2633 * reader of the pack might not understand, and which would therefore prevent
2634 * blind reuse of what we have on disk.
2635 */
2636static int pack_options_allow_reuse(void)
2637{
2638 return pack_to_stdout && allow_ofs_delta;
2639}
2640
2641static int get_object_list_from_bitmap(struct rev_info *revs)
2642{
2643 if (prepare_bitmap_walk(revs) < 0)
2644 return -1;
2645
2646 if (pack_options_allow_reuse() &&
2647 !reuse_partial_packfile_from_bitmap(
2648 &reuse_packfile,
2649 &reuse_packfile_objects,
2650 &reuse_packfile_offset)) {
2651 assert(reuse_packfile_objects)(__builtin_expect(!(reuse_packfile_objects), 0) ? __assert_rtn
(__func__, "builtin/pack-objects.c", 2651, "reuse_packfile_objects"
) : (void)0);
2652 nr_result += reuse_packfile_objects;
2653 display_progress(progress_state, nr_result);
2654 }
2655
2656 traverse_bitmap_commit_list(&add_object_entry_from_bitmap);
2657 return 0;
2658}
2659
2660static void record_recent_object(struct object *obj,
2661 const char *name,
2662 void *data)
2663{
2664 sha1_array_append(&recent_objects, obj->oid.hash);
2665}
2666
2667static void record_recent_commit(struct commit *commit, void *data)
2668{
2669 sha1_array_append(&recent_objects, commit->object.oid.hash);
2670}
2671
2672static void get_object_list(int ac, const char **av)
2673{
2674 struct rev_info revs;
2675 char line[1000];
2676 int flags = 0;
2677
2678 init_revisions(&revs, NULL((void*)0));
2679 save_commit_buffer = 0;
2680 setup_revisions(ac, av, &revs, NULL((void*)0));
2681
2682 /* make sure shallows are read */
2683 is_repository_shallow();
2684
2685 while (fgets(line, sizeof(line), stdin__stdinp) != NULL((void*)0)) {
2686 int len = strlen(line);
2687 if (len && line[len - 1] == '\n')
2688 line[--len] = 0;
2689 if (!len)
2690 break;
2691 if (*line == '-') {
2692 if (!strcmp(line, "--not")) {
2693 flags ^= UNINTERESTING(1u<<1);
2694 write_bitmap_index = 0;
2695 continue;
2696 }
2697 if (starts_with(line, "--shallow ")) {
2698 unsigned char sha1[20];
2699 if (get_sha1_hex(line + 10, sha1))
2700 die("not an SHA-1 '%s'", line + 10);
2701 register_shallow(sha1);
2702 use_bitmap_index = 0;
2703 continue;
2704 }
2705 die("not a rev '%s'", line);
2706 }
2707 if (handle_revision_arg(line, &revs, flags, REVARG_CANNOT_BE_FILENAME01))
2708 die("bad revision '%s'", line);
2709 }
2710
2711 if (use_bitmap_index && !get_object_list_from_bitmap(&revs))
2712 return;
2713
2714 if (prepare_revision_walk(&revs))
2715 die("revision walk setup failed");
2716 mark_edges_uninteresting(&revs, show_edge);
2717 traverse_commit_list(&revs, show_commit, show_object, NULL((void*)0));
2718
2719 if (unpack_unreachable_expiration) {
2720 revs.ignore_missing_links = 1;
2721 if (add_unseen_recent_objects_to_traversal(&revs,
2722 unpack_unreachable_expiration))
2723 die("unable to add recent objects");
2724 if (prepare_revision_walk(&revs))
2725 die("revision walk setup failed");
2726 traverse_commit_list(&revs, record_recent_commit,
2727 record_recent_object, NULL((void*)0));
2728 }
2729
2730 if (keep_unreachable)
2731 add_objects_in_unpacked_packs(&revs);
2732 if (pack_loose_unreachable)
2733 add_unreachable_loose_objects();
2734 if (unpack_unreachable)
2735 loosen_unused_packed_objects(&revs);
2736
2737 sha1_array_clear(&recent_objects);
2738}
2739
2740static int option_parse_index_version(const struct option *opt,
2741 const char *arg, int unset)
2742{
2743 char *c;
2744 const char *val = arg;
2745 pack_idx_opts.version = strtoul(val, &c, 10);
2746 if (pack_idx_opts.version > 2)
2747 die(_("unsupported index version %s"), val);
2748 if (*c == ',' && c[1])
2749 pack_idx_opts.off32_limit = strtoul(c+1, &c, 0);
2750 if (*c || pack_idx_opts.off32_limit & 0x80000000)
2751 die(_("bad index version '%s'"), val);
2752 return 0;
2753}
2754
2755static int option_parse_unpack_unreachable(const struct option *opt,
2756 const char *arg, int unset)
2757{
2758 if (unset) {
2759 unpack_unreachable = 0;
2760 unpack_unreachable_expiration = 0;
2761 }
2762 else {
2763 unpack_unreachable = 1;
2764 if (arg)
2765 unpack_unreachable_expiration = approxidate(arg)approxidate_careful((arg), ((void*)0));
2766 }
2767 return 0;
2768}
2769
2770int cmd_pack_objects(int argc, const char **argv, const char *prefix)
2771{
2772 int use_internal_rev_list = 0;
2773 int thin = 0;
2774 int shallow = 0;
2775 int all_progress_implied = 0;
2776 struct argv_array rp = ARGV_ARRAY_INIT{ empty_argv, 0, 0 };
2777 int rev_list_unpacked = 0, rev_list_all = 0, rev_list_reflog = 0;
2778 int rev_list_index = 0;
2779 struct option pack_objects_options[] = {
2780 OPT_SET_INT('q', "quiet", &progress,{ OPTION_SET_INT, ('q'), ("quiet"), (&progress), ((void*)
0), (("do not show progress meter")), PARSE_OPT_NOARG, ((void
*)0), (0) }
2781 N_("do not show progress meter"), 0){ OPTION_SET_INT, ('q'), ("quiet"), (&progress), ((void*)
0), (("do not show progress meter")), PARSE_OPT_NOARG, ((void
*)0), (0) },
2782 OPT_SET_INT(0, "progress", &progress,{ OPTION_SET_INT, (0), ("progress"), (&progress), ((void*
)0), (("show progress meter")), PARSE_OPT_NOARG, ((void*)0), (
1) }
2783 N_("show progress meter"), 1){ OPTION_SET_INT, (0), ("progress"), (&progress), ((void*
)0), (("show progress meter")), PARSE_OPT_NOARG, ((void*)0), (
1) },
2784 OPT_SET_INT(0, "all-progress", &progress,{ OPTION_SET_INT, (0), ("all-progress"), (&progress), ((void
*)0), (("show progress meter during object writing phase")), PARSE_OPT_NOARG
, ((void*)0), (2) }
2785 N_("show progress meter during object writing phase"), 2){ OPTION_SET_INT, (0), ("all-progress"), (&progress), ((void
*)0), (("show progress meter during object writing phase")), PARSE_OPT_NOARG
, ((void*)0), (2) },
2786 OPT_BOOL(0, "all-progress-implied",{ OPTION_SET_INT, (0), ("all-progress-implied"), (&all_progress_implied
), ((void*)0), (("similar to --all-progress when progress meter is shown"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2787 &all_progress_implied,{ OPTION_SET_INT, (0), ("all-progress-implied"), (&all_progress_implied
), ((void*)0), (("similar to --all-progress when progress meter is shown"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2788 N_("similar to --all-progress when progress meter is shown")){ OPTION_SET_INT, (0), ("all-progress-implied"), (&all_progress_implied
), ((void*)0), (("similar to --all-progress when progress meter is shown"
)), PARSE_OPT_NOARG, ((void*)0), (1) },
2789 { OPTION_CALLBACK, 0, "index-version", NULL((void*)0), N_("version[,offset]")("version[,offset]"),
2790 N_("write the pack index file in the specified idx format version")("write the pack index file in the specified idx format version"
),
2791 0, option_parse_index_version },
2792 OPT_MAGNITUDE(0, "max-pack-size", &pack_size_limit,{ OPTION_MAGNITUDE, (0), ("max-pack-size"), (&pack_size_limit
), ("n"), (("maximum size of each output pack file")), PARSE_OPT_NONEG
}
2793 N_("maximum size of each output pack file")){ OPTION_MAGNITUDE, (0), ("max-pack-size"), (&pack_size_limit
), ("n"), (("maximum size of each output pack file")), PARSE_OPT_NONEG
},
2794 OPT_BOOL(0, "local", &local,{ OPTION_SET_INT, (0), ("local"), (&local), ((void*)0), (
("ignore borrowed objects from alternate object store")), PARSE_OPT_NOARG
, ((void*)0), (1) }
2795 N_("ignore borrowed objects from alternate object store")){ OPTION_SET_INT, (0), ("local"), (&local), ((void*)0), (
("ignore borrowed objects from alternate object store")), PARSE_OPT_NOARG
, ((void*)0), (1) },
2796 OPT_BOOL(0, "incremental", &incremental,{ OPTION_SET_INT, (0), ("incremental"), (&incremental), (
(void*)0), (("ignore packed objects")), PARSE_OPT_NOARG, ((void
*)0), (1) }
2797 N_("ignore packed objects")){ OPTION_SET_INT, (0), ("incremental"), (&incremental), (
(void*)0), (("ignore packed objects")), PARSE_OPT_NOARG, ((void
*)0), (1) },
2798 OPT_INTEGER(0, "window", &window,{ OPTION_INTEGER, (0), ("window"), (&window), ("n"), (("limit pack window by objects"
)) }
2799 N_("limit pack window by objects")){ OPTION_INTEGER, (0), ("window"), (&window), ("n"), (("limit pack window by objects"
)) },
2800 OPT_MAGNITUDE(0, "window-memory", &window_memory_limit,{ OPTION_MAGNITUDE, (0), ("window-memory"), (&window_memory_limit
), ("n"), (("limit pack window by memory in addition to object limit"
)), PARSE_OPT_NONEG }
2801 N_("limit pack window by memory in addition to object limit")){ OPTION_MAGNITUDE, (0), ("window-memory"), (&window_memory_limit
), ("n"), (("limit pack window by memory in addition to object limit"
)), PARSE_OPT_NONEG },
2802 OPT_INTEGER(0, "depth", &depth,{ OPTION_INTEGER, (0), ("depth"), (&depth), ("n"), (("maximum length of delta chain allowed in the resulting pack"
)) }
2803 N_("maximum length of delta chain allowed in the resulting pack")){ OPTION_INTEGER, (0), ("depth"), (&depth), ("n"), (("maximum length of delta chain allowed in the resulting pack"
)) },
2804 OPT_BOOL(0, "reuse-delta", &reuse_delta,{ OPTION_SET_INT, (0), ("reuse-delta"), (&reuse_delta), (
(void*)0), (("reuse existing deltas")), PARSE_OPT_NOARG, ((void
*)0), (1) }
2805 N_("reuse existing deltas")){ OPTION_SET_INT, (0), ("reuse-delta"), (&reuse_delta), (
(void*)0), (("reuse existing deltas")), PARSE_OPT_NOARG, ((void
*)0), (1) },
2806 OPT_BOOL(0, "reuse-object", &reuse_object,{ OPTION_SET_INT, (0), ("reuse-object"), (&reuse_object),
((void*)0), (("reuse existing objects")), PARSE_OPT_NOARG, (
(void*)0), (1) }
2807 N_("reuse existing objects")){ OPTION_SET_INT, (0), ("reuse-object"), (&reuse_object),
((void*)0), (("reuse existing objects")), PARSE_OPT_NOARG, (
(void*)0), (1) },
2808 OPT_BOOL(0, "delta-base-offset", &allow_ofs_delta,{ OPTION_SET_INT, (0), ("delta-base-offset"), (&allow_ofs_delta
), ((void*)0), (("use OFS_DELTA objects")), PARSE_OPT_NOARG, (
(void*)0), (1) }
2809 N_("use OFS_DELTA objects")){ OPTION_SET_INT, (0), ("delta-base-offset"), (&allow_ofs_delta
), ((void*)0), (("use OFS_DELTA objects")), PARSE_OPT_NOARG, (
(void*)0), (1) },
2810 OPT_INTEGER(0, "threads", &delta_search_threads,{ OPTION_INTEGER, (0), ("threads"), (&delta_search_threads
), ("n"), (("use threads when searching for best delta matches"
)) }
2811 N_("use threads when searching for best delta matches")){ OPTION_INTEGER, (0), ("threads"), (&delta_search_threads
), ("n"), (("use threads when searching for best delta matches"
)) },
2812 OPT_BOOL(0, "non-empty", &non_empty,{ OPTION_SET_INT, (0), ("non-empty"), (&non_empty), ((void
*)0), (("do not create an empty pack output")), PARSE_OPT_NOARG
, ((void*)0), (1) }
2813 N_("do not create an empty pack output")){ OPTION_SET_INT, (0), ("non-empty"), (&non_empty), ((void
*)0), (("do not create an empty pack output")), PARSE_OPT_NOARG
, ((void*)0), (1) },
2814 OPT_BOOL(0, "revs", &use_internal_rev_list,{ OPTION_SET_INT, (0), ("revs"), (&use_internal_rev_list)
, ((void*)0), (("read revision arguments from standard input"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2815 N_("read revision arguments from standard input")){ OPTION_SET_INT, (0), ("revs"), (&use_internal_rev_list)
, ((void*)0), (("read revision arguments from standard input"
)), PARSE_OPT_NOARG, ((void*)0), (1) },
2816 { OPTION_SET_INT, 0, "unpacked", &rev_list_unpacked, NULL((void*)0),
2817 N_("limit the objects to those that are not yet packed")("limit the objects to those that are not yet packed"),
2818 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL((void*)0), 1 },
2819 { OPTION_SET_INT, 0, "all", &rev_list_all, NULL((void*)0),
2820 N_("include objects reachable from any reference")("include objects reachable from any reference"),
2821 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL((void*)0), 1 },
2822 { OPTION_SET_INT, 0, "reflog", &rev_list_reflog, NULL((void*)0),
2823 N_("include objects referred by reflog entries")("include objects referred by reflog entries"),
2824 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL((void*)0), 1 },
2825 { OPTION_SET_INT, 0, "indexed-objects", &rev_list_index, NULL((void*)0),
2826 N_("include objects referred to by the index")("include objects referred to by the index"),
2827 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL((void*)0), 1 },
2828 OPT_BOOL(0, "stdout", &pack_to_stdout,{ OPTION_SET_INT, (0), ("stdout"), (&pack_to_stdout), ((void
*)0), (("output pack to stdout")), PARSE_OPT_NOARG, ((void*)0
), (1) }
2829 N_("output pack to stdout")){ OPTION_SET_INT, (0), ("stdout"), (&pack_to_stdout), ((void
*)0), (("output pack to stdout")), PARSE_OPT_NOARG, ((void*)0
), (1) },
2830 OPT_BOOL(0, "include-tag", &include_tag,{ OPTION_SET_INT, (0), ("include-tag"), (&include_tag), (
(void*)0), (("include tag objects that refer to objects to be packed"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2831 N_("include tag objects that refer to objects to be packed")){ OPTION_SET_INT, (0), ("include-tag"), (&include_tag), (
(void*)0), (("include tag objects that refer to objects to be packed"
)), PARSE_OPT_NOARG, ((void*)0), (1) },
2832 OPT_BOOL(0, "keep-unreachable", &keep_unreachable,{ OPTION_SET_INT, (0), ("keep-unreachable"), (&keep_unreachable
), ((void*)0), (("keep unreachable objects")), PARSE_OPT_NOARG
, ((void*)0), (1) }
2833 N_("keep unreachable objects")){ OPTION_SET_INT, (0), ("keep-unreachable"), (&keep_unreachable
), ((void*)0), (("keep unreachable objects")), PARSE_OPT_NOARG
, ((void*)0), (1) },
2834 OPT_BOOL(0, "pack-loose-unreachable", &pack_loose_unreachable,{ OPTION_SET_INT, (0), ("pack-loose-unreachable"), (&pack_loose_unreachable
), ((void*)0), (("pack loose unreachable objects")), PARSE_OPT_NOARG
, ((void*)0), (1) }
2835 N_("pack loose unreachable objects")){ OPTION_SET_INT, (0), ("pack-loose-unreachable"), (&pack_loose_unreachable
), ((void*)0), (("pack loose unreachable objects")), PARSE_OPT_NOARG
, ((void*)0), (1) },
2836 { OPTION_CALLBACK, 0, "unpack-unreachable", NULL((void*)0), N_("time")("time"),
2837 N_("unpack unreachable objects newer than <time>")("unpack unreachable objects newer than <time>"),
2838 PARSE_OPT_OPTARG, option_parse_unpack_unreachable },
2839 OPT_BOOL(0, "thin", &thin,{ OPTION_SET_INT, (0), ("thin"), (&thin), ((void*)0), (("create thin packs"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2840 N_("create thin packs")){ OPTION_SET_INT, (0), ("thin"), (&thin), ((void*)0), (("create thin packs"
)), PARSE_OPT_NOARG, ((void*)0), (1) },
2841 OPT_BOOL(0, "shallow", &shallow,{ OPTION_SET_INT, (0), ("shallow"), (&shallow), ((void*)0
), (("create packs suitable for shallow fetches")), PARSE_OPT_NOARG
, ((void*)0), (1) }
2842 N_("create packs suitable for shallow fetches")){ OPTION_SET_INT, (0), ("shallow"), (&shallow), ((void*)0
), (("create packs suitable for shallow fetches")), PARSE_OPT_NOARG
, ((void*)0), (1) },
2843 OPT_BOOL(0, "honor-pack-keep", &ignore_packed_keep,{ OPTION_SET_INT, (0), ("honor-pack-keep"), (&ignore_packed_keep
), ((void*)0), (("ignore packs that have companion .keep file"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2844 N_("ignore packs that have companion .keep file")){ OPTION_SET_INT, (0), ("honor-pack-keep"), (&ignore_packed_keep
), ((void*)0), (("ignore packs that have companion .keep file"
)), PARSE_OPT_NOARG, ((void*)0), (1) },
2845 OPT_INTEGER(0, "compression", &pack_compression_level,{ OPTION_INTEGER, (0), ("compression"), (&pack_compression_level
), ("n"), (("pack compression level")) }
2846 N_("pack compression level")){ OPTION_INTEGER, (0), ("compression"), (&pack_compression_level
), ("n"), (("pack compression level")) },
2847 OPT_SET_INT(0, "keep-true-parents", &grafts_replace_parents,{ OPTION_SET_INT, (0), ("keep-true-parents"), (&grafts_replace_parents
), ((void*)0), (("do not hide commits by grafts")), PARSE_OPT_NOARG
, ((void*)0), (0) }
2848 N_("do not hide commits by grafts"), 0){ OPTION_SET_INT, (0), ("keep-true-parents"), (&grafts_replace_parents
), ((void*)0), (("do not hide commits by grafts")), PARSE_OPT_NOARG
, ((void*)0), (0) },
2849 OPT_BOOL(0, "use-bitmap-index", &use_bitmap_index,{ OPTION_SET_INT, (0), ("use-bitmap-index"), (&use_bitmap_index
), ((void*)0), (("use a bitmap index if available to speed up counting objects"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2850 N_("use a bitmap index if available to speed up counting objects")){ OPTION_SET_INT, (0), ("use-bitmap-index"), (&use_bitmap_index
), ((void*)0), (("use a bitmap index if available to speed up counting objects"
)), PARSE_OPT_NOARG, ((void*)0), (1) },
2851 OPT_BOOL(0, "write-bitmap-index", &write_bitmap_index,{ OPTION_SET_INT, (0), ("write-bitmap-index"), (&write_bitmap_index
), ((void*)0), (("write a bitmap index together with the pack index"
)), PARSE_OPT_NOARG, ((void*)0), (1) }
2852 N_("write a bitmap index together with the pack index")){ OPTION_SET_INT, (0), ("write-bitmap-index"), (&write_bitmap_index
), ((void*)0), (("write a bitmap index together with the pack index"
)), PARSE_OPT_NOARG, ((void*)0), (1) },
2853 OPT_END(){ OPTION_END },
2854 };
2855
2856 check_replace_refs = 0;
2857
2858 reset_pack_idx_option(&pack_idx_opts);
2859 git_config(git_pack_config, NULL((void*)0));
2860
2861 progress = isatty(2);
2862 argc = parse_options(argc, argv, prefix, pack_objects_options,
2863 pack_usage, 0);
2864
2865 if (argc) {
2866 base_name = argv[0];
2867 argc--;
2868 }
2869 if (pack_to_stdout != !base_name || argc)
2870 usage_with_options(pack_usage, pack_objects_options);
2871
2872 argv_array_push(&rp, "pack-objects");
2873 if (thin) {
2874 use_internal_rev_list = 1;
2875 argv_array_push(&rp, shallow
2876 ? "--objects-edge-aggressive"
2877 : "--objects-edge");
2878 } else
2879 argv_array_push(&rp, "--objects");
2880
2881 if (rev_list_all) {
2882 use_internal_rev_list = 1;
2883 argv_array_push(&rp, "--all");
2884 }
2885 if (rev_list_reflog) {
2886 use_internal_rev_list = 1;
2887 argv_array_push(&rp, "--reflog");
2888 }
2889 if (rev_list_index) {
2890 use_internal_rev_list = 1;
2891 argv_array_push(&rp, "--indexed-objects");
2892 }
2893 if (rev_list_unpacked) {
2894 use_internal_rev_list = 1;
2895 argv_array_push(&rp, "--unpacked");
2896 }
2897
2898 if (!reuse_object)
2899 reuse_delta = 0;
2900 if (pack_compression_level == -1)
2901 pack_compression_level = Z_DEFAULT_COMPRESSION(-1);
2902 else if (pack_compression_level < 0 || pack_compression_level > Z_BEST_COMPRESSION9)
2903 die("bad pack compression level %d", pack_compression_level);
2904
2905 if (!delta_search_threads) /* --threads=0 means autodetect */
2906 delta_search_threads = online_cpus();
2907
2908#ifdef NO_PTHREADS
2909 if (delta_search_threads != 1)
2910 warning("no threads support, ignoring --threads");
2911#endif
2912 if (!pack_to_stdout && !pack_size_limit)
2913 pack_size_limit = pack_size_limit_cfg;
2914 if (pack_to_stdout && pack_size_limit)
2915 die("--max-pack-size cannot be used to build a pack for transfer.");
2916 if (pack_size_limit && pack_size_limit < 1024*1024) {
2917 warning("minimum pack size limit is 1 MiB");
2918 pack_size_limit = 1024*1024;
2919 }
2920
2921 if (!pack_to_stdout && thin)
2922 die("--thin cannot be used to build an indexable pack.");
2923
2924 if (keep_unreachable && unpack_unreachable)
2925 die("--keep-unreachable and --unpack-unreachable are incompatible.");
2926 if (!rev_list_all || !rev_list_reflog || !rev_list_index)
2927 unpack_unreachable_expiration = 0;
2928
2929 /*
2930 * "soft" reasons not to use bitmaps - for on-disk repack by default we want
2931 *
2932 * - to produce good pack (with bitmap index not-yet-packed objects are
2933 * packed in suboptimal order).
2934 *
2935 * - to use more robust pack-generation codepath (avoiding possible
2936 * bugs in bitmap code and possible bitmap index corruption).
2937 */
2938 if (!pack_to_stdout)
2939 use_bitmap_index_default = 0;
2940
2941 if (use_bitmap_index < 0)
2942 use_bitmap_index = use_bitmap_index_default;
2943
2944 /* "hard" reasons not to use bitmaps; these just won't work at all */
2945 if (!use_internal_rev_list || (!pack_to_stdout && write_bitmap_index) || is_repository_shallow())
2946 use_bitmap_index = 0;
2947
2948 if (pack_to_stdout || !rev_list_all)
2949 write_bitmap_index = 0;
2950
2951 if (progress && all_progress_implied)
2952 progress = 2;
2953
2954 prepare_packed_git();
2955 if (ignore_packed_keep) {
2956 struct packed_git *p;
2957 for (p = packed_git; p; p = p->next)
2958 if (p->pack_local && p->pack_keep)
2959 break;
2960 if (!p) /* no keep-able packs found */
2961 ignore_packed_keep = 0;
2962 }
2963 if (local) {
2964 /*
2965 * unlike ignore_packed_keep above, we do not want to
2966 * unset "local" based on looking at packs, as it
2967 * also covers non-local objects
2968 */
2969 struct packed_git *p;
2970 for (p = packed_git; p; p = p->next) {
2971 if (!p->pack_local) {
2972 have_non_local_packs = 1;
2973 break;
2974 }
2975 }
2976 }
2977
2978 if (progress)
2979 progress_state = start_progress(_("Counting objects"), 0);
2980 if (!use_internal_rev_list)
2981 read_object_list_from_stdin();
2982 else {
2983 get_object_list(rp.argc, rp.argv);
2984 argv_array_clear(&rp);
2985 }
2986 cleanup_preferred_base();
2987 if (include_tag && nr_result)
2988 for_each_ref(add_ref_tag, NULL((void*)0));
2989 stop_progress(&progress_state);
2990
2991 if (non_empty && !nr_result)
2992 return 0;
2993 if (nr_result)
2994 prepare_pack(window, depth);
2995 write_pack_file();
2996 if (progress)
2997 fprintf(stderr__stderrp, "Total %"PRIu32"u"" (delta %"PRIu32"u""),"
2998 " reused %"PRIu32"u"" (delta %"PRIu32"u"")\n",
2999 written, written_delta, reused, reused_delta);
3000 return 0;
3001}