pack-objects: refer to delta objects by index instead of pointer
[git/git.git] / builtin / pack-objects.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "repository.h"
4 #include "config.h"
5 #include "attr.h"
6 #include "object.h"
7 #include "blob.h"
8 #include "commit.h"
9 #include "tag.h"
10 #include "tree.h"
11 #include "delta.h"
12 #include "pack.h"
13 #include "pack-revindex.h"
14 #include "csum-file.h"
15 #include "tree-walk.h"
16 #include "diff.h"
17 #include "revision.h"
18 #include "list-objects.h"
19 #include "list-objects-filter.h"
20 #include "list-objects-filter-options.h"
21 #include "pack-objects.h"
22 #include "progress.h"
23 #include "refs.h"
24 #include "streaming.h"
25 #include "thread-utils.h"
26 #include "pack-bitmap.h"
27 #include "reachable.h"
28 #include "sha1-array.h"
29 #include "argv-array.h"
30 #include "list.h"
31 #include "packfile.h"
32 #include "object-store.h"
33
34 #define IN_PACK(obj) oe_in_pack(&to_pack, obj)
35 #define DELTA(obj) oe_delta(&to_pack, obj)
36 #define DELTA_CHILD(obj) oe_delta_child(&to_pack, obj)
37 #define DELTA_SIBLING(obj) oe_delta_sibling(&to_pack, obj)
38 #define SET_DELTA(obj, val) oe_set_delta(&to_pack, obj, val)
39 #define SET_DELTA_CHILD(obj, val) oe_set_delta_child(&to_pack, obj, val)
40 #define SET_DELTA_SIBLING(obj, val) oe_set_delta_sibling(&to_pack, obj, val)
41
42 static const char *pack_usage[] = {
43 N_("git pack-objects --stdout [<options>...] [< <ref-list> | < <object-list>]"),
44 N_("git pack-objects [<options>...] <base-name> [< <ref-list> | < <object-list>]"),
45 NULL
46 };
47
48 /*
49 * Objects we are going to pack are collected in the `to_pack` structure.
50 * It contains an array (dynamically expanded) of the object data, and a map
51 * that can resolve SHA1s to their position in the array.
52 */
53 static struct packing_data to_pack;
54
55 static struct pack_idx_entry **written_list;
56 static uint32_t nr_result, nr_written;
57
58 static int non_empty;
59 static int reuse_delta = 1, reuse_object = 1;
60 static int keep_unreachable, unpack_unreachable, include_tag;
61 static timestamp_t unpack_unreachable_expiration;
62 static int pack_loose_unreachable;
63 static int local;
64 static int have_non_local_packs;
65 static int incremental;
66 static int ignore_packed_keep;
67 static int allow_ofs_delta;
68 static struct pack_idx_option pack_idx_opts;
69 static const char *base_name;
70 static int progress = 1;
71 static int window = 10;
72 static unsigned long pack_size_limit;
73 static int depth = 50;
74 static int delta_search_threads;
75 static int pack_to_stdout;
76 static int num_preferred_base;
77 static struct progress *progress_state;
78
79 static struct packed_git *reuse_packfile;
80 static uint32_t reuse_packfile_objects;
81 static off_t reuse_packfile_offset;
82
83 static int use_bitmap_index_default = 1;
84 static int use_bitmap_index = -1;
85 static int write_bitmap_index;
86 static uint16_t write_bitmap_options;
87
88 static int exclude_promisor_objects;
89
90 static unsigned long delta_cache_size = 0;
91 static unsigned long max_delta_cache_size = 256 * 1024 * 1024;
92 static unsigned long cache_max_small_delta_size = 1000;
93
94 static unsigned long window_memory_limit = 0;
95
96 static struct list_objects_filter_options filter_options;
97
98 enum missing_action {
99 MA_ERROR = 0, /* fail if any missing objects are encountered */
100 MA_ALLOW_ANY, /* silently allow ALL missing objects */
101 MA_ALLOW_PROMISOR, /* silently allow all missing PROMISOR objects */
102 };
103 static enum missing_action arg_missing_action;
104 static show_object_fn fn_show_object;
105
106 /*
107 * stats
108 */
109 static uint32_t written, written_delta;
110 static uint32_t reused, reused_delta;
111
112 /*
113 * Indexed commits
114 */
115 static struct commit **indexed_commits;
116 static unsigned int indexed_commits_nr;
117 static unsigned int indexed_commits_alloc;
118
119 static void index_commit_for_bitmap(struct commit *commit)
120 {
121 if (indexed_commits_nr >= indexed_commits_alloc) {
122 indexed_commits_alloc = (indexed_commits_alloc + 32) * 2;
123 REALLOC_ARRAY(indexed_commits, indexed_commits_alloc);
124 }
125
126 indexed_commits[indexed_commits_nr++] = commit;
127 }
128
129 static void *get_delta(struct object_entry *entry)
130 {
131 unsigned long size, base_size, delta_size;
132 void *buf, *base_buf, *delta_buf;
133 enum object_type type;
134
135 buf = read_object_file(&entry->idx.oid, &type, &size);
136 if (!buf)
137 die("unable to read %s", oid_to_hex(&entry->idx.oid));
138 base_buf = read_object_file(&DELTA(entry)->idx.oid, &type,
139 &base_size);
140 if (!base_buf)
141 die("unable to read %s",
142 oid_to_hex(&DELTA(entry)->idx.oid));
143 delta_buf = diff_delta(base_buf, base_size,
144 buf, size, &delta_size, 0);
145 if (!delta_buf || delta_size != entry->delta_size)
146 die("delta size changed");
147 free(buf);
148 free(base_buf);
149 return delta_buf;
150 }
151
152 static unsigned long do_compress(void **pptr, unsigned long size)
153 {
154 git_zstream stream;
155 void *in, *out;
156 unsigned long maxsize;
157
158 git_deflate_init(&stream, pack_compression_level);
159 maxsize = git_deflate_bound(&stream, size);
160
161 in = *pptr;
162 out = xmalloc(maxsize);
163 *pptr = out;
164
165 stream.next_in = in;
166 stream.avail_in = size;
167 stream.next_out = out;
168 stream.avail_out = maxsize;
169 while (git_deflate(&stream, Z_FINISH) == Z_OK)
170 ; /* nothing */
171 git_deflate_end(&stream);
172
173 free(in);
174 return stream.total_out;
175 }
176
177 static unsigned long write_large_blob_data(struct git_istream *st, struct hashfile *f,
178 const struct object_id *oid)
179 {
180 git_zstream stream;
181 unsigned char ibuf[1024 * 16];
182 unsigned char obuf[1024 * 16];
183 unsigned long olen = 0;
184
185 git_deflate_init(&stream, pack_compression_level);
186
187 for (;;) {
188 ssize_t readlen;
189 int zret = Z_OK;
190 readlen = read_istream(st, ibuf, sizeof(ibuf));
191 if (readlen == -1)
192 die(_("unable to read %s"), oid_to_hex(oid));
193
194 stream.next_in = ibuf;
195 stream.avail_in = readlen;
196 while ((stream.avail_in || readlen == 0) &&
197 (zret == Z_OK || zret == Z_BUF_ERROR)) {
198 stream.next_out = obuf;
199 stream.avail_out = sizeof(obuf);
200 zret = git_deflate(&stream, readlen ? 0 : Z_FINISH);
201 hashwrite(f, obuf, stream.next_out - obuf);
202 olen += stream.next_out - obuf;
203 }
204 if (stream.avail_in)
205 die(_("deflate error (%d)"), zret);
206 if (readlen == 0) {
207 if (zret != Z_STREAM_END)
208 die(_("deflate error (%d)"), zret);
209 break;
210 }
211 }
212 git_deflate_end(&stream);
213 return olen;
214 }
215
216 /*
217 * we are going to reuse the existing object data as is. make
218 * sure it is not corrupt.
219 */
220 static int check_pack_inflate(struct packed_git *p,
221 struct pack_window **w_curs,
222 off_t offset,
223 off_t len,
224 unsigned long expect)
225 {
226 git_zstream stream;
227 unsigned char fakebuf[4096], *in;
228 int st;
229
230 memset(&stream, 0, sizeof(stream));
231 git_inflate_init(&stream);
232 do {
233 in = use_pack(p, w_curs, offset, &stream.avail_in);
234 stream.next_in = in;
235 stream.next_out = fakebuf;
236 stream.avail_out = sizeof(fakebuf);
237 st = git_inflate(&stream, Z_FINISH);
238 offset += stream.next_in - in;
239 } while (st == Z_OK || st == Z_BUF_ERROR);
240 git_inflate_end(&stream);
241 return (st == Z_STREAM_END &&
242 stream.total_out == expect &&
243 stream.total_in == len) ? 0 : -1;
244 }
245
246 static void copy_pack_data(struct hashfile *f,
247 struct packed_git *p,
248 struct pack_window **w_curs,
249 off_t offset,
250 off_t len)
251 {
252 unsigned char *in;
253 unsigned long avail;
254
255 while (len) {
256 in = use_pack(p, w_curs, offset, &avail);
257 if (avail > len)
258 avail = (unsigned long)len;
259 hashwrite(f, in, avail);
260 offset += avail;
261 len -= avail;
262 }
263 }
264
265 /* Return 0 if we will bust the pack-size limit */
266 static unsigned long write_no_reuse_object(struct hashfile *f, struct object_entry *entry,
267 unsigned long limit, int usable_delta)
268 {
269 unsigned long size, datalen;
270 unsigned char header[MAX_PACK_OBJECT_HEADER],
271 dheader[MAX_PACK_OBJECT_HEADER];
272 unsigned hdrlen;
273 enum object_type type;
274 void *buf;
275 struct git_istream *st = NULL;
276
277 if (!usable_delta) {
278 if (oe_type(entry) == OBJ_BLOB &&
279 entry->size > big_file_threshold &&
280 (st = open_istream(&entry->idx.oid, &type, &size, NULL)) != NULL)
281 buf = NULL;
282 else {
283 buf = read_object_file(&entry->idx.oid, &type, &size);
284 if (!buf)
285 die(_("unable to read %s"),
286 oid_to_hex(&entry->idx.oid));
287 }
288 /*
289 * make sure no cached delta data remains from a
290 * previous attempt before a pack split occurred.
291 */
292 FREE_AND_NULL(entry->delta_data);
293 entry->z_delta_size = 0;
294 } else if (entry->delta_data) {
295 size = entry->delta_size;
296 buf = entry->delta_data;
297 entry->delta_data = NULL;
298 type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
299 OBJ_OFS_DELTA : OBJ_REF_DELTA;
300 } else {
301 buf = get_delta(entry);
302 size = entry->delta_size;
303 type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
304 OBJ_OFS_DELTA : OBJ_REF_DELTA;
305 }
306
307 if (st) /* large blob case, just assume we don't compress well */
308 datalen = size;
309 else if (entry->z_delta_size)
310 datalen = entry->z_delta_size;
311 else
312 datalen = do_compress(&buf, size);
313
314 /*
315 * The object header is a byte of 'type' followed by zero or
316 * more bytes of length.
317 */
318 hdrlen = encode_in_pack_object_header(header, sizeof(header),
319 type, size);
320
321 if (type == OBJ_OFS_DELTA) {
322 /*
323 * Deltas with relative base contain an additional
324 * encoding of the relative offset for the delta
325 * base from this object's position in the pack.
326 */
327 off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset;
328 unsigned pos = sizeof(dheader) - 1;
329 dheader[pos] = ofs & 127;
330 while (ofs >>= 7)
331 dheader[--pos] = 128 | (--ofs & 127);
332 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
333 if (st)
334 close_istream(st);
335 free(buf);
336 return 0;
337 }
338 hashwrite(f, header, hdrlen);
339 hashwrite(f, dheader + pos, sizeof(dheader) - pos);
340 hdrlen += sizeof(dheader) - pos;
341 } else if (type == OBJ_REF_DELTA) {
342 /*
343 * Deltas with a base reference contain
344 * an additional 20 bytes for the base sha1.
345 */
346 if (limit && hdrlen + 20 + datalen + 20 >= limit) {
347 if (st)
348 close_istream(st);
349 free(buf);
350 return 0;
351 }
352 hashwrite(f, header, hdrlen);
353 hashwrite(f, DELTA(entry)->idx.oid.hash, 20);
354 hdrlen += 20;
355 } else {
356 if (limit && hdrlen + datalen + 20 >= limit) {
357 if (st)
358 close_istream(st);
359 free(buf);
360 return 0;
361 }
362 hashwrite(f, header, hdrlen);
363 }
364 if (st) {
365 datalen = write_large_blob_data(st, f, &entry->idx.oid);
366 close_istream(st);
367 } else {
368 hashwrite(f, buf, datalen);
369 free(buf);
370 }
371
372 return hdrlen + datalen;
373 }
374
375 /* Return 0 if we will bust the pack-size limit */
376 static off_t write_reuse_object(struct hashfile *f, struct object_entry *entry,
377 unsigned long limit, int usable_delta)
378 {
379 struct packed_git *p = IN_PACK(entry);
380 struct pack_window *w_curs = NULL;
381 struct revindex_entry *revidx;
382 off_t offset;
383 enum object_type type = oe_type(entry);
384 off_t datalen;
385 unsigned char header[MAX_PACK_OBJECT_HEADER],
386 dheader[MAX_PACK_OBJECT_HEADER];
387 unsigned hdrlen;
388
389 if (DELTA(entry))
390 type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
391 OBJ_OFS_DELTA : OBJ_REF_DELTA;
392 hdrlen = encode_in_pack_object_header(header, sizeof(header),
393 type, entry->size);
394
395 offset = entry->in_pack_offset;
396 revidx = find_pack_revindex(p, offset);
397 datalen = revidx[1].offset - offset;
398 if (!pack_to_stdout && p->index_version > 1 &&
399 check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
400 error("bad packed object CRC for %s",
401 oid_to_hex(&entry->idx.oid));
402 unuse_pack(&w_curs);
403 return write_no_reuse_object(f, entry, limit, usable_delta);
404 }
405
406 offset += entry->in_pack_header_size;
407 datalen -= entry->in_pack_header_size;
408
409 if (!pack_to_stdout && p->index_version == 1 &&
410 check_pack_inflate(p, &w_curs, offset, datalen, entry->size)) {
411 error("corrupt packed object for %s",
412 oid_to_hex(&entry->idx.oid));
413 unuse_pack(&w_curs);
414 return write_no_reuse_object(f, entry, limit, usable_delta);
415 }
416
417 if (type == OBJ_OFS_DELTA) {
418 off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset;
419 unsigned pos = sizeof(dheader) - 1;
420 dheader[pos] = ofs & 127;
421 while (ofs >>= 7)
422 dheader[--pos] = 128 | (--ofs & 127);
423 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
424 unuse_pack(&w_curs);
425 return 0;
426 }
427 hashwrite(f, header, hdrlen);
428 hashwrite(f, dheader + pos, sizeof(dheader) - pos);
429 hdrlen += sizeof(dheader) - pos;
430 reused_delta++;
431 } else if (type == OBJ_REF_DELTA) {
432 if (limit && hdrlen + 20 + datalen + 20 >= limit) {
433 unuse_pack(&w_curs);
434 return 0;
435 }
436 hashwrite(f, header, hdrlen);
437 hashwrite(f, DELTA(entry)->idx.oid.hash, 20);
438 hdrlen += 20;
439 reused_delta++;
440 } else {
441 if (limit && hdrlen + datalen + 20 >= limit) {
442 unuse_pack(&w_curs);
443 return 0;
444 }
445 hashwrite(f, header, hdrlen);
446 }
447 copy_pack_data(f, p, &w_curs, offset, datalen);
448 unuse_pack(&w_curs);
449 reused++;
450 return hdrlen + datalen;
451 }
452
453 /* Return 0 if we will bust the pack-size limit */
454 static off_t write_object(struct hashfile *f,
455 struct object_entry *entry,
456 off_t write_offset)
457 {
458 unsigned long limit;
459 off_t len;
460 int usable_delta, to_reuse;
461
462 if (!pack_to_stdout)
463 crc32_begin(f);
464
465 /* apply size limit if limited packsize and not first object */
466 if (!pack_size_limit || !nr_written)
467 limit = 0;
468 else if (pack_size_limit <= write_offset)
469 /*
470 * the earlier object did not fit the limit; avoid
471 * mistaking this with unlimited (i.e. limit = 0).
472 */
473 limit = 1;
474 else
475 limit = pack_size_limit - write_offset;
476
477 if (!DELTA(entry))
478 usable_delta = 0; /* no delta */
479 else if (!pack_size_limit)
480 usable_delta = 1; /* unlimited packfile */
481 else if (DELTA(entry)->idx.offset == (off_t)-1)
482 usable_delta = 0; /* base was written to another pack */
483 else if (DELTA(entry)->idx.offset)
484 usable_delta = 1; /* base already exists in this pack */
485 else
486 usable_delta = 0; /* base could end up in another pack */
487
488 if (!reuse_object)
489 to_reuse = 0; /* explicit */
490 else if (!IN_PACK(entry))
491 to_reuse = 0; /* can't reuse what we don't have */
492 else if (oe_type(entry) == OBJ_REF_DELTA ||
493 oe_type(entry) == OBJ_OFS_DELTA)
494 /* check_object() decided it for us ... */
495 to_reuse = usable_delta;
496 /* ... but pack split may override that */
497 else if (oe_type(entry) != entry->in_pack_type)
498 to_reuse = 0; /* pack has delta which is unusable */
499 else if (DELTA(entry))
500 to_reuse = 0; /* we want to pack afresh */
501 else
502 to_reuse = 1; /* we have it in-pack undeltified,
503 * and we do not need to deltify it.
504 */
505
506 if (!to_reuse)
507 len = write_no_reuse_object(f, entry, limit, usable_delta);
508 else
509 len = write_reuse_object(f, entry, limit, usable_delta);
510 if (!len)
511 return 0;
512
513 if (usable_delta)
514 written_delta++;
515 written++;
516 if (!pack_to_stdout)
517 entry->idx.crc32 = crc32_end(f);
518 return len;
519 }
520
521 enum write_one_status {
522 WRITE_ONE_SKIP = -1, /* already written */
523 WRITE_ONE_BREAK = 0, /* writing this will bust the limit; not written */
524 WRITE_ONE_WRITTEN = 1, /* normal */
525 WRITE_ONE_RECURSIVE = 2 /* already scheduled to be written */
526 };
527
528 static enum write_one_status write_one(struct hashfile *f,
529 struct object_entry *e,
530 off_t *offset)
531 {
532 off_t size;
533 int recursing;
534
535 /*
536 * we set offset to 1 (which is an impossible value) to mark
537 * the fact that this object is involved in "write its base
538 * first before writing a deltified object" recursion.
539 */
540 recursing = (e->idx.offset == 1);
541 if (recursing) {
542 warning("recursive delta detected for object %s",
543 oid_to_hex(&e->idx.oid));
544 return WRITE_ONE_RECURSIVE;
545 } else if (e->idx.offset || e->preferred_base) {
546 /* offset is non zero if object is written already. */
547 return WRITE_ONE_SKIP;
548 }
549
550 /* if we are deltified, write out base object first. */
551 if (DELTA(e)) {
552 e->idx.offset = 1; /* now recurse */
553 switch (write_one(f, DELTA(e), offset)) {
554 case WRITE_ONE_RECURSIVE:
555 /* we cannot depend on this one */
556 SET_DELTA(e, NULL);
557 break;
558 default:
559 break;
560 case WRITE_ONE_BREAK:
561 e->idx.offset = recursing;
562 return WRITE_ONE_BREAK;
563 }
564 }
565
566 e->idx.offset = *offset;
567 size = write_object(f, e, *offset);
568 if (!size) {
569 e->idx.offset = recursing;
570 return WRITE_ONE_BREAK;
571 }
572 written_list[nr_written++] = &e->idx;
573
574 /* make sure off_t is sufficiently large not to wrap */
575 if (signed_add_overflows(*offset, size))
576 die("pack too large for current definition of off_t");
577 *offset += size;
578 return WRITE_ONE_WRITTEN;
579 }
580
581 static int mark_tagged(const char *path, const struct object_id *oid, int flag,
582 void *cb_data)
583 {
584 struct object_id peeled;
585 struct object_entry *entry = packlist_find(&to_pack, oid->hash, NULL);
586
587 if (entry)
588 entry->tagged = 1;
589 if (!peel_ref(path, &peeled)) {
590 entry = packlist_find(&to_pack, peeled.hash, NULL);
591 if (entry)
592 entry->tagged = 1;
593 }
594 return 0;
595 }
596
597 static inline void add_to_write_order(struct object_entry **wo,
598 unsigned int *endp,
599 struct object_entry *e)
600 {
601 if (e->filled)
602 return;
603 wo[(*endp)++] = e;
604 e->filled = 1;
605 }
606
607 static void add_descendants_to_write_order(struct object_entry **wo,
608 unsigned int *endp,
609 struct object_entry *e)
610 {
611 int add_to_order = 1;
612 while (e) {
613 if (add_to_order) {
614 struct object_entry *s;
615 /* add this node... */
616 add_to_write_order(wo, endp, e);
617 /* all its siblings... */
618 for (s = DELTA_SIBLING(e); s; s = DELTA_SIBLING(s)) {
619 add_to_write_order(wo, endp, s);
620 }
621 }
622 /* drop down a level to add left subtree nodes if possible */
623 if (DELTA_CHILD(e)) {
624 add_to_order = 1;
625 e = DELTA_CHILD(e);
626 } else {
627 add_to_order = 0;
628 /* our sibling might have some children, it is next */
629 if (DELTA_SIBLING(e)) {
630 e = DELTA_SIBLING(e);
631 continue;
632 }
633 /* go back to our parent node */
634 e = DELTA(e);
635 while (e && !DELTA_SIBLING(e)) {
636 /* we're on the right side of a subtree, keep
637 * going up until we can go right again */
638 e = DELTA(e);
639 }
640 if (!e) {
641 /* done- we hit our original root node */
642 return;
643 }
644 /* pass it off to sibling at this level */
645 e = DELTA_SIBLING(e);
646 }
647 };
648 }
649
650 static void add_family_to_write_order(struct object_entry **wo,
651 unsigned int *endp,
652 struct object_entry *e)
653 {
654 struct object_entry *root;
655
656 for (root = e; DELTA(root); root = DELTA(root))
657 ; /* nothing */
658 add_descendants_to_write_order(wo, endp, root);
659 }
660
661 static struct object_entry **compute_write_order(void)
662 {
663 unsigned int i, wo_end, last_untagged;
664
665 struct object_entry **wo;
666 struct object_entry *objects = to_pack.objects;
667
668 for (i = 0; i < to_pack.nr_objects; i++) {
669 objects[i].tagged = 0;
670 objects[i].filled = 0;
671 SET_DELTA_CHILD(&objects[i], NULL);
672 SET_DELTA_SIBLING(&objects[i], NULL);
673 }
674
675 /*
676 * Fully connect delta_child/delta_sibling network.
677 * Make sure delta_sibling is sorted in the original
678 * recency order.
679 */
680 for (i = to_pack.nr_objects; i > 0;) {
681 struct object_entry *e = &objects[--i];
682 if (!DELTA(e))
683 continue;
684 /* Mark me as the first child */
685 e->delta_sibling_idx = DELTA(e)->delta_child_idx;
686 SET_DELTA_CHILD(DELTA(e), e);
687 }
688
689 /*
690 * Mark objects that are at the tip of tags.
691 */
692 for_each_tag_ref(mark_tagged, NULL);
693
694 /*
695 * Give the objects in the original recency order until
696 * we see a tagged tip.
697 */
698 ALLOC_ARRAY(wo, to_pack.nr_objects);
699 for (i = wo_end = 0; i < to_pack.nr_objects; i++) {
700 if (objects[i].tagged)
701 break;
702 add_to_write_order(wo, &wo_end, &objects[i]);
703 }
704 last_untagged = i;
705
706 /*
707 * Then fill all the tagged tips.
708 */
709 for (; i < to_pack.nr_objects; i++) {
710 if (objects[i].tagged)
711 add_to_write_order(wo, &wo_end, &objects[i]);
712 }
713
714 /*
715 * And then all remaining commits and tags.
716 */
717 for (i = last_untagged; i < to_pack.nr_objects; i++) {
718 if (oe_type(&objects[i]) != OBJ_COMMIT &&
719 oe_type(&objects[i]) != OBJ_TAG)
720 continue;
721 add_to_write_order(wo, &wo_end, &objects[i]);
722 }
723
724 /*
725 * And then all the trees.
726 */
727 for (i = last_untagged; i < to_pack.nr_objects; i++) {
728 if (oe_type(&objects[i]) != OBJ_TREE)
729 continue;
730 add_to_write_order(wo, &wo_end, &objects[i]);
731 }
732
733 /*
734 * Finally all the rest in really tight order
735 */
736 for (i = last_untagged; i < to_pack.nr_objects; i++) {
737 if (!objects[i].filled)
738 add_family_to_write_order(wo, &wo_end, &objects[i]);
739 }
740
741 if (wo_end != to_pack.nr_objects)
742 die("ordered %u objects, expected %"PRIu32, wo_end, to_pack.nr_objects);
743
744 return wo;
745 }
746
747 static off_t write_reused_pack(struct hashfile *f)
748 {
749 unsigned char buffer[8192];
750 off_t to_write, total;
751 int fd;
752
753 if (!is_pack_valid(reuse_packfile))
754 die("packfile is invalid: %s", reuse_packfile->pack_name);
755
756 fd = git_open(reuse_packfile->pack_name);
757 if (fd < 0)
758 die_errno("unable to open packfile for reuse: %s",
759 reuse_packfile->pack_name);
760
761 if (lseek(fd, sizeof(struct pack_header), SEEK_SET) == -1)
762 die_errno("unable to seek in reused packfile");
763
764 if (reuse_packfile_offset < 0)
765 reuse_packfile_offset = reuse_packfile->pack_size - 20;
766
767 total = to_write = reuse_packfile_offset - sizeof(struct pack_header);
768
769 while (to_write) {
770 int read_pack = xread(fd, buffer, sizeof(buffer));
771
772 if (read_pack <= 0)
773 die_errno("unable to read from reused packfile");
774
775 if (read_pack > to_write)
776 read_pack = to_write;
777
778 hashwrite(f, buffer, read_pack);
779 to_write -= read_pack;
780
781 /*
782 * We don't know the actual number of objects written,
783 * only how many bytes written, how many bytes total, and
784 * how many objects total. So we can fake it by pretending all
785 * objects we are writing are the same size. This gives us a
786 * smooth progress meter, and at the end it matches the true
787 * answer.
788 */
789 written = reuse_packfile_objects *
790 (((double)(total - to_write)) / total);
791 display_progress(progress_state, written);
792 }
793
794 close(fd);
795 written = reuse_packfile_objects;
796 display_progress(progress_state, written);
797 return reuse_packfile_offset - sizeof(struct pack_header);
798 }
799
800 static const char no_split_warning[] = N_(
801 "disabling bitmap writing, packs are split due to pack.packSizeLimit"
802 );
803
804 static void write_pack_file(void)
805 {
806 uint32_t i = 0, j;
807 struct hashfile *f;
808 off_t offset;
809 uint32_t nr_remaining = nr_result;
810 time_t last_mtime = 0;
811 struct object_entry **write_order;
812
813 if (progress > pack_to_stdout)
814 progress_state = start_progress(_("Writing objects"), nr_result);
815 ALLOC_ARRAY(written_list, to_pack.nr_objects);
816 write_order = compute_write_order();
817
818 do {
819 struct object_id oid;
820 char *pack_tmp_name = NULL;
821
822 if (pack_to_stdout)
823 f = hashfd_throughput(1, "<stdout>", progress_state);
824 else
825 f = create_tmp_packfile(&pack_tmp_name);
826
827 offset = write_pack_header(f, nr_remaining);
828
829 if (reuse_packfile) {
830 off_t packfile_size;
831 assert(pack_to_stdout);
832
833 packfile_size = write_reused_pack(f);
834 offset += packfile_size;
835 }
836
837 nr_written = 0;
838 for (; i < to_pack.nr_objects; i++) {
839 struct object_entry *e = write_order[i];
840 if (write_one(f, e, &offset) == WRITE_ONE_BREAK)
841 break;
842 display_progress(progress_state, written);
843 }
844
845 /*
846 * Did we write the wrong # entries in the header?
847 * If so, rewrite it like in fast-import
848 */
849 if (pack_to_stdout) {
850 hashclose(f, oid.hash, CSUM_CLOSE);
851 } else if (nr_written == nr_remaining) {
852 hashclose(f, oid.hash, CSUM_FSYNC);
853 } else {
854 int fd = hashclose(f, oid.hash, 0);
855 fixup_pack_header_footer(fd, oid.hash, pack_tmp_name,
856 nr_written, oid.hash, offset);
857 close(fd);
858 if (write_bitmap_index) {
859 warning(_(no_split_warning));
860 write_bitmap_index = 0;
861 }
862 }
863
864 if (!pack_to_stdout) {
865 struct stat st;
866 struct strbuf tmpname = STRBUF_INIT;
867
868 /*
869 * Packs are runtime accessed in their mtime
870 * order since newer packs are more likely to contain
871 * younger objects. So if we are creating multiple
872 * packs then we should modify the mtime of later ones
873 * to preserve this property.
874 */
875 if (stat(pack_tmp_name, &st) < 0) {
876 warning_errno("failed to stat %s", pack_tmp_name);
877 } else if (!last_mtime) {
878 last_mtime = st.st_mtime;
879 } else {
880 struct utimbuf utb;
881 utb.actime = st.st_atime;
882 utb.modtime = --last_mtime;
883 if (utime(pack_tmp_name, &utb) < 0)
884 warning_errno("failed utime() on %s", pack_tmp_name);
885 }
886
887 strbuf_addf(&tmpname, "%s-", base_name);
888
889 if (write_bitmap_index) {
890 bitmap_writer_set_checksum(oid.hash);
891 bitmap_writer_build_type_index(
892 &to_pack, written_list, nr_written);
893 }
894
895 finish_tmp_packfile(&tmpname, pack_tmp_name,
896 written_list, nr_written,
897 &pack_idx_opts, oid.hash);
898
899 if (write_bitmap_index) {
900 strbuf_addf(&tmpname, "%s.bitmap", oid_to_hex(&oid));
901
902 stop_progress(&progress_state);
903
904 bitmap_writer_show_progress(progress);
905 bitmap_writer_reuse_bitmaps(&to_pack);
906 bitmap_writer_select_commits(indexed_commits, indexed_commits_nr, -1);
907 bitmap_writer_build(&to_pack);
908 bitmap_writer_finish(written_list, nr_written,
909 tmpname.buf, write_bitmap_options);
910 write_bitmap_index = 0;
911 }
912
913 strbuf_release(&tmpname);
914 free(pack_tmp_name);
915 puts(oid_to_hex(&oid));
916 }
917
918 /* mark written objects as written to previous pack */
919 for (j = 0; j < nr_written; j++) {
920 written_list[j]->offset = (off_t)-1;
921 }
922 nr_remaining -= nr_written;
923 } while (nr_remaining && i < to_pack.nr_objects);
924
925 free(written_list);
926 free(write_order);
927 stop_progress(&progress_state);
928 if (written != nr_result)
929 die("wrote %"PRIu32" objects while expecting %"PRIu32,
930 written, nr_result);
931 }
932
933 static int no_try_delta(const char *path)
934 {
935 static struct attr_check *check;
936
937 if (!check)
938 check = attr_check_initl("delta", NULL);
939 if (git_check_attr(path, check))
940 return 0;
941 if (ATTR_FALSE(check->items[0].value))
942 return 1;
943 return 0;
944 }
945
946 /*
947 * When adding an object, check whether we have already added it
948 * to our packing list. If so, we can skip. However, if we are
949 * being asked to excludei t, but the previous mention was to include
950 * it, make sure to adjust its flags and tweak our numbers accordingly.
951 *
952 * As an optimization, we pass out the index position where we would have
953 * found the item, since that saves us from having to look it up again a
954 * few lines later when we want to add the new entry.
955 */
956 static int have_duplicate_entry(const struct object_id *oid,
957 int exclude,
958 uint32_t *index_pos)
959 {
960 struct object_entry *entry;
961
962 entry = packlist_find(&to_pack, oid->hash, index_pos);
963 if (!entry)
964 return 0;
965
966 if (exclude) {
967 if (!entry->preferred_base)
968 nr_result--;
969 entry->preferred_base = 1;
970 }
971
972 return 1;
973 }
974
975 static int want_found_object(int exclude, struct packed_git *p)
976 {
977 if (exclude)
978 return 1;
979 if (incremental)
980 return 0;
981
982 /*
983 * When asked to do --local (do not include an object that appears in a
984 * pack we borrow from elsewhere) or --honor-pack-keep (do not include
985 * an object that appears in a pack marked with .keep), finding a pack
986 * that matches the criteria is sufficient for us to decide to omit it.
987 * However, even if this pack does not satisfy the criteria, we need to
988 * make sure no copy of this object appears in _any_ pack that makes us
989 * to omit the object, so we need to check all the packs.
990 *
991 * We can however first check whether these options can possible matter;
992 * if they do not matter we know we want the object in generated pack.
993 * Otherwise, we signal "-1" at the end to tell the caller that we do
994 * not know either way, and it needs to check more packs.
995 */
996 if (!ignore_packed_keep &&
997 (!local || !have_non_local_packs))
998 return 1;
999
1000 if (local && !p->pack_local)
1001 return 0;
1002 if (ignore_packed_keep && p->pack_local && p->pack_keep)
1003 return 0;
1004
1005 /* we don't know yet; keep looking for more packs */
1006 return -1;
1007 }
1008
1009 /*
1010 * Check whether we want the object in the pack (e.g., we do not want
1011 * objects found in non-local stores if the "--local" option was used).
1012 *
1013 * If the caller already knows an existing pack it wants to take the object
1014 * from, that is passed in *found_pack and *found_offset; otherwise this
1015 * function finds if there is any pack that has the object and returns the pack
1016 * and its offset in these variables.
1017 */
1018 static int want_object_in_pack(const struct object_id *oid,
1019 int exclude,
1020 struct packed_git **found_pack,
1021 off_t *found_offset)
1022 {
1023 int want;
1024 struct list_head *pos;
1025
1026 if (!exclude && local && has_loose_object_nonlocal(oid->hash))
1027 return 0;
1028
1029 /*
1030 * If we already know the pack object lives in, start checks from that
1031 * pack - in the usual case when neither --local was given nor .keep files
1032 * are present we will determine the answer right now.
1033 */
1034 if (*found_pack) {
1035 want = want_found_object(exclude, *found_pack);
1036 if (want != -1)
1037 return want;
1038 }
1039 list_for_each(pos, get_packed_git_mru(the_repository)) {
1040 struct packed_git *p = list_entry(pos, struct packed_git, mru);
1041 off_t offset;
1042
1043 if (p == *found_pack)
1044 offset = *found_offset;
1045 else
1046 offset = find_pack_entry_one(oid->hash, p);
1047
1048 if (offset) {
1049 if (!*found_pack) {
1050 if (!is_pack_valid(p))
1051 continue;
1052 *found_offset = offset;
1053 *found_pack = p;
1054 }
1055 want = want_found_object(exclude, p);
1056 if (!exclude && want > 0)
1057 list_move(&p->mru,
1058 get_packed_git_mru(the_repository));
1059 if (want != -1)
1060 return want;
1061 }
1062 }
1063
1064 return 1;
1065 }
1066
1067 static void create_object_entry(const struct object_id *oid,
1068 enum object_type type,
1069 uint32_t hash,
1070 int exclude,
1071 int no_try_delta,
1072 uint32_t index_pos,
1073 struct packed_git *found_pack,
1074 off_t found_offset)
1075 {
1076 struct object_entry *entry;
1077
1078 entry = packlist_alloc(&to_pack, oid->hash, index_pos);
1079 entry->hash = hash;
1080 oe_set_type(entry, type);
1081 if (exclude)
1082 entry->preferred_base = 1;
1083 else
1084 nr_result++;
1085 if (found_pack) {
1086 oe_set_in_pack(&to_pack, entry, found_pack);
1087 entry->in_pack_offset = found_offset;
1088 }
1089
1090 entry->no_try_delta = no_try_delta;
1091 }
1092
1093 static const char no_closure_warning[] = N_(
1094 "disabling bitmap writing, as some objects are not being packed"
1095 );
1096
1097 static int add_object_entry(const struct object_id *oid, enum object_type type,
1098 const char *name, int exclude)
1099 {
1100 struct packed_git *found_pack = NULL;
1101 off_t found_offset = 0;
1102 uint32_t index_pos;
1103
1104 if (have_duplicate_entry(oid, exclude, &index_pos))
1105 return 0;
1106
1107 if (!want_object_in_pack(oid, exclude, &found_pack, &found_offset)) {
1108 /* The pack is missing an object, so it will not have closure */
1109 if (write_bitmap_index) {
1110 warning(_(no_closure_warning));
1111 write_bitmap_index = 0;
1112 }
1113 return 0;
1114 }
1115
1116 create_object_entry(oid, type, pack_name_hash(name),
1117 exclude, name && no_try_delta(name),
1118 index_pos, found_pack, found_offset);
1119
1120 display_progress(progress_state, nr_result);
1121 return 1;
1122 }
1123
1124 static int add_object_entry_from_bitmap(const struct object_id *oid,
1125 enum object_type type,
1126 int flags, uint32_t name_hash,
1127 struct packed_git *pack, off_t offset)
1128 {
1129 uint32_t index_pos;
1130
1131 if (have_duplicate_entry(oid, 0, &index_pos))
1132 return 0;
1133
1134 if (!want_object_in_pack(oid, 0, &pack, &offset))
1135 return 0;
1136
1137 create_object_entry(oid, type, name_hash, 0, 0, index_pos, pack, offset);
1138
1139 display_progress(progress_state, nr_result);
1140 return 1;
1141 }
1142
1143 struct pbase_tree_cache {
1144 struct object_id oid;
1145 int ref;
1146 int temporary;
1147 void *tree_data;
1148 unsigned long tree_size;
1149 };
1150
1151 static struct pbase_tree_cache *(pbase_tree_cache[256]);
1152 static int pbase_tree_cache_ix(const struct object_id *oid)
1153 {
1154 return oid->hash[0] % ARRAY_SIZE(pbase_tree_cache);
1155 }
1156 static int pbase_tree_cache_ix_incr(int ix)
1157 {
1158 return (ix+1) % ARRAY_SIZE(pbase_tree_cache);
1159 }
1160
1161 static struct pbase_tree {
1162 struct pbase_tree *next;
1163 /* This is a phony "cache" entry; we are not
1164 * going to evict it or find it through _get()
1165 * mechanism -- this is for the toplevel node that
1166 * would almost always change with any commit.
1167 */
1168 struct pbase_tree_cache pcache;
1169 } *pbase_tree;
1170
1171 static struct pbase_tree_cache *pbase_tree_get(const struct object_id *oid)
1172 {
1173 struct pbase_tree_cache *ent, *nent;
1174 void *data;
1175 unsigned long size;
1176 enum object_type type;
1177 int neigh;
1178 int my_ix = pbase_tree_cache_ix(oid);
1179 int available_ix = -1;
1180
1181 /* pbase-tree-cache acts as a limited hashtable.
1182 * your object will be found at your index or within a few
1183 * slots after that slot if it is cached.
1184 */
1185 for (neigh = 0; neigh < 8; neigh++) {
1186 ent = pbase_tree_cache[my_ix];
1187 if (ent && !oidcmp(&ent->oid, oid)) {
1188 ent->ref++;
1189 return ent;
1190 }
1191 else if (((available_ix < 0) && (!ent || !ent->ref)) ||
1192 ((0 <= available_ix) &&
1193 (!ent && pbase_tree_cache[available_ix])))
1194 available_ix = my_ix;
1195 if (!ent)
1196 break;
1197 my_ix = pbase_tree_cache_ix_incr(my_ix);
1198 }
1199
1200 /* Did not find one. Either we got a bogus request or
1201 * we need to read and perhaps cache.
1202 */
1203 data = read_object_file(oid, &type, &size);
1204 if (!data)
1205 return NULL;
1206 if (type != OBJ_TREE) {
1207 free(data);
1208 return NULL;
1209 }
1210
1211 /* We need to either cache or return a throwaway copy */
1212
1213 if (available_ix < 0)
1214 ent = NULL;
1215 else {
1216 ent = pbase_tree_cache[available_ix];
1217 my_ix = available_ix;
1218 }
1219
1220 if (!ent) {
1221 nent = xmalloc(sizeof(*nent));
1222 nent->temporary = (available_ix < 0);
1223 }
1224 else {
1225 /* evict and reuse */
1226 free(ent->tree_data);
1227 nent = ent;
1228 }
1229 oidcpy(&nent->oid, oid);
1230 nent->tree_data = data;
1231 nent->tree_size = size;
1232 nent->ref = 1;
1233 if (!nent->temporary)
1234 pbase_tree_cache[my_ix] = nent;
1235 return nent;
1236 }
1237
1238 static void pbase_tree_put(struct pbase_tree_cache *cache)
1239 {
1240 if (!cache->temporary) {
1241 cache->ref--;
1242 return;
1243 }
1244 free(cache->tree_data);
1245 free(cache);
1246 }
1247
1248 static int name_cmp_len(const char *name)
1249 {
1250 int i;
1251 for (i = 0; name[i] && name[i] != '\n' && name[i] != '/'; i++)
1252 ;
1253 return i;
1254 }
1255
1256 static void add_pbase_object(struct tree_desc *tree,
1257 const char *name,
1258 int cmplen,
1259 const char *fullname)
1260 {
1261 struct name_entry entry;
1262 int cmp;
1263
1264 while (tree_entry(tree,&entry)) {
1265 if (S_ISGITLINK(entry.mode))
1266 continue;
1267 cmp = tree_entry_len(&entry) != cmplen ? 1 :
1268 memcmp(name, entry.path, cmplen);
1269 if (cmp > 0)
1270 continue;
1271 if (cmp < 0)
1272 return;
1273 if (name[cmplen] != '/') {
1274 add_object_entry(entry.oid,
1275 object_type(entry.mode),
1276 fullname, 1);
1277 return;
1278 }
1279 if (S_ISDIR(entry.mode)) {
1280 struct tree_desc sub;
1281 struct pbase_tree_cache *tree;
1282 const char *down = name+cmplen+1;
1283 int downlen = name_cmp_len(down);
1284
1285 tree = pbase_tree_get(entry.oid);
1286 if (!tree)
1287 return;
1288 init_tree_desc(&sub, tree->tree_data, tree->tree_size);
1289
1290 add_pbase_object(&sub, down, downlen, fullname);
1291 pbase_tree_put(tree);
1292 }
1293 }
1294 }
1295
1296 static unsigned *done_pbase_paths;
1297 static int done_pbase_paths_num;
1298 static int done_pbase_paths_alloc;
1299 static int done_pbase_path_pos(unsigned hash)
1300 {
1301 int lo = 0;
1302 int hi = done_pbase_paths_num;
1303 while (lo < hi) {
1304 int mi = lo + (hi - lo) / 2;
1305 if (done_pbase_paths[mi] == hash)
1306 return mi;
1307 if (done_pbase_paths[mi] < hash)
1308 hi = mi;
1309 else
1310 lo = mi + 1;
1311 }
1312 return -lo-1;
1313 }
1314
1315 static int check_pbase_path(unsigned hash)
1316 {
1317 int pos = done_pbase_path_pos(hash);
1318 if (0 <= pos)
1319 return 1;
1320 pos = -pos - 1;
1321 ALLOC_GROW(done_pbase_paths,
1322 done_pbase_paths_num + 1,
1323 done_pbase_paths_alloc);
1324 done_pbase_paths_num++;
1325 if (pos < done_pbase_paths_num)
1326 MOVE_ARRAY(done_pbase_paths + pos + 1, done_pbase_paths + pos,
1327 done_pbase_paths_num - pos - 1);
1328 done_pbase_paths[pos] = hash;
1329 return 0;
1330 }
1331
1332 static void add_preferred_base_object(const char *name)
1333 {
1334 struct pbase_tree *it;
1335 int cmplen;
1336 unsigned hash = pack_name_hash(name);
1337
1338 if (!num_preferred_base || check_pbase_path(hash))
1339 return;
1340
1341 cmplen = name_cmp_len(name);
1342 for (it = pbase_tree; it; it = it->next) {
1343 if (cmplen == 0) {
1344 add_object_entry(&it->pcache.oid, OBJ_TREE, NULL, 1);
1345 }
1346 else {
1347 struct tree_desc tree;
1348 init_tree_desc(&tree, it->pcache.tree_data, it->pcache.tree_size);
1349 add_pbase_object(&tree, name, cmplen, name);
1350 }
1351 }
1352 }
1353
1354 static void add_preferred_base(struct object_id *oid)
1355 {
1356 struct pbase_tree *it;
1357 void *data;
1358 unsigned long size;
1359 struct object_id tree_oid;
1360
1361 if (window <= num_preferred_base++)
1362 return;
1363
1364 data = read_object_with_reference(oid, tree_type, &size, &tree_oid);
1365 if (!data)
1366 return;
1367
1368 for (it = pbase_tree; it; it = it->next) {
1369 if (!oidcmp(&it->pcache.oid, &tree_oid)) {
1370 free(data);
1371 return;
1372 }
1373 }
1374
1375 it = xcalloc(1, sizeof(*it));
1376 it->next = pbase_tree;
1377 pbase_tree = it;
1378
1379 oidcpy(&it->pcache.oid, &tree_oid);
1380 it->pcache.tree_data = data;
1381 it->pcache.tree_size = size;
1382 }
1383
1384 static void cleanup_preferred_base(void)
1385 {
1386 struct pbase_tree *it;
1387 unsigned i;
1388
1389 it = pbase_tree;
1390 pbase_tree = NULL;
1391 while (it) {
1392 struct pbase_tree *tmp = it;
1393 it = tmp->next;
1394 free(tmp->pcache.tree_data);
1395 free(tmp);
1396 }
1397
1398 for (i = 0; i < ARRAY_SIZE(pbase_tree_cache); i++) {
1399 if (!pbase_tree_cache[i])
1400 continue;
1401 free(pbase_tree_cache[i]->tree_data);
1402 FREE_AND_NULL(pbase_tree_cache[i]);
1403 }
1404
1405 FREE_AND_NULL(done_pbase_paths);
1406 done_pbase_paths_num = done_pbase_paths_alloc = 0;
1407 }
1408
1409 static void check_object(struct object_entry *entry)
1410 {
1411 if (IN_PACK(entry)) {
1412 struct packed_git *p = IN_PACK(entry);
1413 struct pack_window *w_curs = NULL;
1414 const unsigned char *base_ref = NULL;
1415 struct object_entry *base_entry;
1416 unsigned long used, used_0;
1417 unsigned long avail;
1418 off_t ofs;
1419 unsigned char *buf, c;
1420 enum object_type type;
1421
1422 buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail);
1423
1424 /*
1425 * We want in_pack_type even if we do not reuse delta
1426 * since non-delta representations could still be reused.
1427 */
1428 used = unpack_object_header_buffer(buf, avail,
1429 &type,
1430 &entry->size);
1431 if (used == 0)
1432 goto give_up;
1433
1434 if (type < 0)
1435 BUG("invalid type %d", type);
1436 entry->in_pack_type = type;
1437
1438 /*
1439 * Determine if this is a delta and if so whether we can
1440 * reuse it or not. Otherwise let's find out as cheaply as
1441 * possible what the actual type and size for this object is.
1442 */
1443 switch (entry->in_pack_type) {
1444 default:
1445 /* Not a delta hence we've already got all we need. */
1446 oe_set_type(entry, entry->in_pack_type);
1447 entry->in_pack_header_size = used;
1448 if (oe_type(entry) < OBJ_COMMIT || oe_type(entry) > OBJ_BLOB)
1449 goto give_up;
1450 unuse_pack(&w_curs);
1451 return;
1452 case OBJ_REF_DELTA:
1453 if (reuse_delta && !entry->preferred_base)
1454 base_ref = use_pack(p, &w_curs,
1455 entry->in_pack_offset + used, NULL);
1456 entry->in_pack_header_size = used + 20;
1457 break;
1458 case OBJ_OFS_DELTA:
1459 buf = use_pack(p, &w_curs,
1460 entry->in_pack_offset + used, NULL);
1461 used_0 = 0;
1462 c = buf[used_0++];
1463 ofs = c & 127;
1464 while (c & 128) {
1465 ofs += 1;
1466 if (!ofs || MSB(ofs, 7)) {
1467 error("delta base offset overflow in pack for %s",
1468 oid_to_hex(&entry->idx.oid));
1469 goto give_up;
1470 }
1471 c = buf[used_0++];
1472 ofs = (ofs << 7) + (c & 127);
1473 }
1474 ofs = entry->in_pack_offset - ofs;
1475 if (ofs <= 0 || ofs >= entry->in_pack_offset) {
1476 error("delta base offset out of bound for %s",
1477 oid_to_hex(&entry->idx.oid));
1478 goto give_up;
1479 }
1480 if (reuse_delta && !entry->preferred_base) {
1481 struct revindex_entry *revidx;
1482 revidx = find_pack_revindex(p, ofs);
1483 if (!revidx)
1484 goto give_up;
1485 base_ref = nth_packed_object_sha1(p, revidx->nr);
1486 }
1487 entry->in_pack_header_size = used + used_0;
1488 break;
1489 }
1490
1491 if (base_ref && (base_entry = packlist_find(&to_pack, base_ref, NULL))) {
1492 /*
1493 * If base_ref was set above that means we wish to
1494 * reuse delta data, and we even found that base
1495 * in the list of objects we want to pack. Goodie!
1496 *
1497 * Depth value does not matter - find_deltas() will
1498 * never consider reused delta as the base object to
1499 * deltify other objects against, in order to avoid
1500 * circular deltas.
1501 */
1502 oe_set_type(entry, entry->in_pack_type);
1503 SET_DELTA(entry, base_entry);
1504 entry->delta_size = entry->size;
1505 entry->delta_sibling_idx = base_entry->delta_child_idx;
1506 SET_DELTA_CHILD(base_entry, entry);
1507 unuse_pack(&w_curs);
1508 return;
1509 }
1510
1511 if (oe_type(entry)) {
1512 /*
1513 * This must be a delta and we already know what the
1514 * final object type is. Let's extract the actual
1515 * object size from the delta header.
1516 */
1517 entry->size = get_size_from_delta(p, &w_curs,
1518 entry->in_pack_offset + entry->in_pack_header_size);
1519 if (entry->size == 0)
1520 goto give_up;
1521 unuse_pack(&w_curs);
1522 return;
1523 }
1524
1525 /*
1526 * No choice but to fall back to the recursive delta walk
1527 * with sha1_object_info() to find about the object type
1528 * at this point...
1529 */
1530 give_up:
1531 unuse_pack(&w_curs);
1532 }
1533
1534 oe_set_type(entry, oid_object_info(&entry->idx.oid, &entry->size));
1535 /*
1536 * The error condition is checked in prepare_pack(). This is
1537 * to permit a missing preferred base object to be ignored
1538 * as a preferred base. Doing so can result in a larger
1539 * pack file, but the transfer will still take place.
1540 */
1541 }
1542
1543 static int pack_offset_sort(const void *_a, const void *_b)
1544 {
1545 const struct object_entry *a = *(struct object_entry **)_a;
1546 const struct object_entry *b = *(struct object_entry **)_b;
1547 const struct packed_git *a_in_pack = IN_PACK(a);
1548 const struct packed_git *b_in_pack = IN_PACK(b);
1549
1550 /* avoid filesystem trashing with loose objects */
1551 if (!a_in_pack && !b_in_pack)
1552 return oidcmp(&a->idx.oid, &b->idx.oid);
1553
1554 if (a_in_pack < b_in_pack)
1555 return -1;
1556 if (a_in_pack > b_in_pack)
1557 return 1;
1558 return a->in_pack_offset < b->in_pack_offset ? -1 :
1559 (a->in_pack_offset > b->in_pack_offset);
1560 }
1561
1562 /*
1563 * Drop an on-disk delta we were planning to reuse. Naively, this would
1564 * just involve blanking out the "delta" field, but we have to deal
1565 * with some extra book-keeping:
1566 *
1567 * 1. Removing ourselves from the delta_sibling linked list.
1568 *
1569 * 2. Updating our size/type to the non-delta representation. These were
1570 * either not recorded initially (size) or overwritten with the delta type
1571 * (type) when check_object() decided to reuse the delta.
1572 *
1573 * 3. Resetting our delta depth, as we are now a base object.
1574 */
1575 static void drop_reused_delta(struct object_entry *entry)
1576 {
1577 unsigned *idx = &to_pack.objects[entry->delta_idx - 1].delta_child_idx;
1578 struct object_info oi = OBJECT_INFO_INIT;
1579 enum object_type type;
1580
1581 while (*idx) {
1582 struct object_entry *oe = &to_pack.objects[*idx - 1];
1583
1584 if (oe == entry)
1585 *idx = oe->delta_sibling_idx;
1586 else
1587 idx = &oe->delta_sibling_idx;
1588 }
1589 SET_DELTA(entry, NULL);
1590 entry->depth = 0;
1591
1592 oi.sizep = &entry->size;
1593 oi.typep = &type;
1594 if (packed_object_info(IN_PACK(entry), entry->in_pack_offset, &oi) < 0) {
1595 /*
1596 * We failed to get the info from this pack for some reason;
1597 * fall back to sha1_object_info, which may find another copy.
1598 * And if that fails, the error will be recorded in oe_type(entry)
1599 * and dealt with in prepare_pack().
1600 */
1601 oe_set_type(entry, oid_object_info(&entry->idx.oid,
1602 &entry->size));
1603 } else {
1604 oe_set_type(entry, type);
1605 }
1606 }
1607
1608 /*
1609 * Follow the chain of deltas from this entry onward, throwing away any links
1610 * that cause us to hit a cycle (as determined by the DFS state flags in
1611 * the entries).
1612 *
1613 * We also detect too-long reused chains that would violate our --depth
1614 * limit.
1615 */
1616 static void break_delta_chains(struct object_entry *entry)
1617 {
1618 /*
1619 * The actual depth of each object we will write is stored as an int,
1620 * as it cannot exceed our int "depth" limit. But before we break
1621 * changes based no that limit, we may potentially go as deep as the
1622 * number of objects, which is elsewhere bounded to a uint32_t.
1623 */
1624 uint32_t total_depth;
1625 struct object_entry *cur, *next;
1626
1627 for (cur = entry, total_depth = 0;
1628 cur;
1629 cur = DELTA(cur), total_depth++) {
1630 if (cur->dfs_state == DFS_DONE) {
1631 /*
1632 * We've already seen this object and know it isn't
1633 * part of a cycle. We do need to append its depth
1634 * to our count.
1635 */
1636 total_depth += cur->depth;
1637 break;
1638 }
1639
1640 /*
1641 * We break cycles before looping, so an ACTIVE state (or any
1642 * other cruft which made its way into the state variable)
1643 * is a bug.
1644 */
1645 if (cur->dfs_state != DFS_NONE)
1646 die("BUG: confusing delta dfs state in first pass: %d",
1647 cur->dfs_state);
1648
1649 /*
1650 * Now we know this is the first time we've seen the object. If
1651 * it's not a delta, we're done traversing, but we'll mark it
1652 * done to save time on future traversals.
1653 */
1654 if (!DELTA(cur)) {
1655 cur->dfs_state = DFS_DONE;
1656 break;
1657 }
1658
1659 /*
1660 * Mark ourselves as active and see if the next step causes
1661 * us to cycle to another active object. It's important to do
1662 * this _before_ we loop, because it impacts where we make the
1663 * cut, and thus how our total_depth counter works.
1664 * E.g., We may see a partial loop like:
1665 *
1666 * A -> B -> C -> D -> B
1667 *
1668 * Cutting B->C breaks the cycle. But now the depth of A is
1669 * only 1, and our total_depth counter is at 3. The size of the
1670 * error is always one less than the size of the cycle we
1671 * broke. Commits C and D were "lost" from A's chain.
1672 *
1673 * If we instead cut D->B, then the depth of A is correct at 3.
1674 * We keep all commits in the chain that we examined.
1675 */
1676 cur->dfs_state = DFS_ACTIVE;
1677 if (DELTA(cur)->dfs_state == DFS_ACTIVE) {
1678 drop_reused_delta(cur);
1679 cur->dfs_state = DFS_DONE;
1680 break;
1681 }
1682 }
1683
1684 /*
1685 * And now that we've gone all the way to the bottom of the chain, we
1686 * need to clear the active flags and set the depth fields as
1687 * appropriate. Unlike the loop above, which can quit when it drops a
1688 * delta, we need to keep going to look for more depth cuts. So we need
1689 * an extra "next" pointer to keep going after we reset cur->delta.
1690 */
1691 for (cur = entry; cur; cur = next) {
1692 next = DELTA(cur);
1693
1694 /*
1695 * We should have a chain of zero or more ACTIVE states down to
1696 * a final DONE. We can quit after the DONE, because either it
1697 * has no bases, or we've already handled them in a previous
1698 * call.
1699 */
1700 if (cur->dfs_state == DFS_DONE)
1701 break;
1702 else if (cur->dfs_state != DFS_ACTIVE)
1703 die("BUG: confusing delta dfs state in second pass: %d",
1704 cur->dfs_state);
1705
1706 /*
1707 * If the total_depth is more than depth, then we need to snip
1708 * the chain into two or more smaller chains that don't exceed
1709 * the maximum depth. Most of the resulting chains will contain
1710 * (depth + 1) entries (i.e., depth deltas plus one base), and
1711 * the last chain (i.e., the one containing entry) will contain
1712 * whatever entries are left over, namely
1713 * (total_depth % (depth + 1)) of them.
1714 *
1715 * Since we are iterating towards decreasing depth, we need to
1716 * decrement total_depth as we go, and we need to write to the
1717 * entry what its final depth will be after all of the
1718 * snipping. Since we're snipping into chains of length (depth
1719 * + 1) entries, the final depth of an entry will be its
1720 * original depth modulo (depth + 1). Any time we encounter an
1721 * entry whose final depth is supposed to be zero, we snip it
1722 * from its delta base, thereby making it so.
1723 */
1724 cur->depth = (total_depth--) % (depth + 1);
1725 if (!cur->depth)
1726 drop_reused_delta(cur);
1727
1728 cur->dfs_state = DFS_DONE;
1729 }
1730 }
1731
1732 static void get_object_details(void)
1733 {
1734 uint32_t i;
1735 struct object_entry **sorted_by_offset;
1736
1737 sorted_by_offset = xcalloc(to_pack.nr_objects, sizeof(struct object_entry *));
1738 for (i = 0; i < to_pack.nr_objects; i++)
1739 sorted_by_offset[i] = to_pack.objects + i;
1740 QSORT(sorted_by_offset, to_pack.nr_objects, pack_offset_sort);
1741
1742 for (i = 0; i < to_pack.nr_objects; i++) {
1743 struct object_entry *entry = sorted_by_offset[i];
1744 check_object(entry);
1745 if (big_file_threshold < entry->size)
1746 entry->no_try_delta = 1;
1747 }
1748
1749 /*
1750 * This must happen in a second pass, since we rely on the delta
1751 * information for the whole list being completed.
1752 */
1753 for (i = 0; i < to_pack.nr_objects; i++)
1754 break_delta_chains(&to_pack.objects[i]);
1755
1756 free(sorted_by_offset);
1757 }
1758
1759 /*
1760 * We search for deltas in a list sorted by type, by filename hash, and then
1761 * by size, so that we see progressively smaller and smaller files.
1762 * That's because we prefer deltas to be from the bigger file
1763 * to the smaller -- deletes are potentially cheaper, but perhaps
1764 * more importantly, the bigger file is likely the more recent
1765 * one. The deepest deltas are therefore the oldest objects which are
1766 * less susceptible to be accessed often.
1767 */
1768 static int type_size_sort(const void *_a, const void *_b)
1769 {
1770 const struct object_entry *a = *(struct object_entry **)_a;
1771 const struct object_entry *b = *(struct object_entry **)_b;
1772 enum object_type a_type = oe_type(a);
1773 enum object_type b_type = oe_type(b);
1774
1775 if (a_type > b_type)
1776 return -1;
1777 if (a_type < b_type)
1778 return 1;
1779 if (a->hash > b->hash)
1780 return -1;
1781 if (a->hash < b->hash)
1782 return 1;
1783 if (a->preferred_base > b->preferred_base)
1784 return -1;
1785 if (a->preferred_base < b->preferred_base)
1786 return 1;
1787 if (a->size > b->size)
1788 return -1;
1789 if (a->size < b->size)
1790 return 1;
1791 return a < b ? -1 : (a > b); /* newest first */
1792 }
1793
1794 struct unpacked {
1795 struct object_entry *entry;
1796 void *data;
1797 struct delta_index *index;
1798 unsigned depth;
1799 };
1800
1801 static int delta_cacheable(unsigned long src_size, unsigned long trg_size,
1802 unsigned long delta_size)
1803 {
1804 if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size)
1805 return 0;
1806
1807 if (delta_size < cache_max_small_delta_size)
1808 return 1;
1809
1810 /* cache delta, if objects are large enough compared to delta size */
1811 if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10))
1812 return 1;
1813
1814 return 0;
1815 }
1816
1817 #ifndef NO_PTHREADS
1818
1819 static pthread_mutex_t read_mutex;
1820 #define read_lock() pthread_mutex_lock(&read_mutex)
1821 #define read_unlock() pthread_mutex_unlock(&read_mutex)
1822
1823 static pthread_mutex_t cache_mutex;
1824 #define cache_lock() pthread_mutex_lock(&cache_mutex)
1825 #define cache_unlock() pthread_mutex_unlock(&cache_mutex)
1826
1827 static pthread_mutex_t progress_mutex;
1828 #define progress_lock() pthread_mutex_lock(&progress_mutex)
1829 #define progress_unlock() pthread_mutex_unlock(&progress_mutex)
1830
1831 #else
1832
1833 #define read_lock() (void)0
1834 #define read_unlock() (void)0
1835 #define cache_lock() (void)0
1836 #define cache_unlock() (void)0
1837 #define progress_lock() (void)0
1838 #define progress_unlock() (void)0
1839
1840 #endif
1841
1842 static int try_delta(struct unpacked *trg, struct unpacked *src,
1843 unsigned max_depth, unsigned long *mem_usage)
1844 {
1845 struct object_entry *trg_entry = trg->entry;
1846 struct object_entry *src_entry = src->entry;
1847 unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
1848 unsigned ref_depth;
1849 enum object_type type;
1850 void *delta_buf;
1851
1852 /* Don't bother doing diffs between different types */
1853 if (oe_type(trg_entry) != oe_type(src_entry))
1854 return -1;
1855
1856 /*
1857 * We do not bother to try a delta that we discarded on an
1858 * earlier try, but only when reusing delta data. Note that
1859 * src_entry that is marked as the preferred_base should always
1860 * be considered, as even if we produce a suboptimal delta against
1861 * it, we will still save the transfer cost, as we already know
1862 * the other side has it and we won't send src_entry at all.
1863 */
1864 if (reuse_delta && IN_PACK(trg_entry) &&
1865 IN_PACK(trg_entry) == IN_PACK(src_entry) &&
1866 !src_entry->preferred_base &&
1867 trg_entry->in_pack_type != OBJ_REF_DELTA &&
1868 trg_entry->in_pack_type != OBJ_OFS_DELTA)
1869 return 0;
1870
1871 /* Let's not bust the allowed depth. */
1872 if (src->depth >= max_depth)
1873 return 0;
1874
1875 /* Now some size filtering heuristics. */
1876 trg_size = trg_entry->size;
1877 if (!DELTA(trg_entry)) {
1878 max_size = trg_size/2 - 20;
1879 ref_depth = 1;
1880 } else {
1881 max_size = trg_entry->delta_size;
1882 ref_depth = trg->depth;
1883 }
1884 max_size = (uint64_t)max_size * (max_depth - src->depth) /
1885 (max_depth - ref_depth + 1);
1886 if (max_size == 0)
1887 return 0;
1888 src_size = src_entry->size;
1889 sizediff = src_size < trg_size ? trg_size - src_size : 0;
1890 if (sizediff >= max_size)
1891 return 0;
1892 if (trg_size < src_size / 32)
1893 return 0;
1894
1895 /* Load data if not already done */
1896 if (!trg->data) {
1897 read_lock();
1898 trg->data = read_object_file(&trg_entry->idx.oid, &type, &sz);
1899 read_unlock();
1900 if (!trg->data)
1901 die("object %s cannot be read",
1902 oid_to_hex(&trg_entry->idx.oid));
1903 if (sz != trg_size)
1904 die("object %s inconsistent object length (%lu vs %lu)",
1905 oid_to_hex(&trg_entry->idx.oid), sz,
1906 trg_size);
1907 *mem_usage += sz;
1908 }
1909 if (!src->data) {
1910 read_lock();
1911 src->data = read_object_file(&src_entry->idx.oid, &type, &sz);
1912 read_unlock();
1913 if (!src->data) {
1914 if (src_entry->preferred_base) {
1915 static int warned = 0;
1916 if (!warned++)
1917 warning("object %s cannot be read",
1918 oid_to_hex(&src_entry->idx.oid));
1919 /*
1920 * Those objects are not included in the
1921 * resulting pack. Be resilient and ignore
1922 * them if they can't be read, in case the
1923 * pack could be created nevertheless.
1924 */
1925 return 0;
1926 }
1927 die("object %s cannot be read",
1928 oid_to_hex(&src_entry->idx.oid));
1929 }
1930 if (sz != src_size)
1931 die("object %s inconsistent object length (%lu vs %lu)",
1932 oid_to_hex(&src_entry->idx.oid), sz,
1933 src_size);
1934 *mem_usage += sz;
1935 }
1936 if (!src->index) {
1937 src->index = create_delta_index(src->data, src_size);
1938 if (!src->index) {
1939 static int warned = 0;
1940 if (!warned++)
1941 warning("suboptimal pack - out of memory");
1942 return 0;
1943 }
1944 *mem_usage += sizeof_delta_index(src->index);
1945 }
1946
1947 delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
1948 if (!delta_buf)
1949 return 0;
1950
1951 if (DELTA(trg_entry)) {
1952 /* Prefer only shallower same-sized deltas. */
1953 if (delta_size == trg_entry->delta_size &&
1954 src->depth + 1 >= trg->depth) {
1955 free(delta_buf);
1956 return 0;
1957 }
1958 }
1959
1960 /*
1961 * Handle memory allocation outside of the cache
1962 * accounting lock. Compiler will optimize the strangeness
1963 * away when NO_PTHREADS is defined.
1964 */
1965 free(trg_entry->delta_data);
1966 cache_lock();
1967 if (trg_entry->delta_data) {
1968 delta_cache_size -= trg_entry->delta_size;
1969 trg_entry->delta_data = NULL;
1970 }
1971 if (delta_cacheable(src_size, trg_size, delta_size)) {
1972 delta_cache_size += delta_size;
1973 cache_unlock();
1974 trg_entry->delta_data = xrealloc(delta_buf, delta_size);
1975 } else {
1976 cache_unlock();
1977 free(delta_buf);
1978 }
1979
1980 SET_DELTA(trg_entry, src_entry);
1981 trg_entry->delta_size = delta_size;
1982 trg->depth = src->depth + 1;
1983
1984 return 1;
1985 }
1986
1987 static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
1988 {
1989 struct object_entry *child = DELTA_CHILD(me);
1990 unsigned int m = n;
1991 while (child) {
1992 unsigned int c = check_delta_limit(child, n + 1);
1993 if (m < c)
1994 m = c;
1995 child = DELTA_SIBLING(child);
1996 }
1997 return m;
1998 }
1999
2000 static unsigned long free_unpacked(struct unpacked *n)
2001 {
2002 unsigned long freed_mem = sizeof_delta_index(n->index);
2003 free_delta_index(n->index);
2004 n->index = NULL;
2005 if (n->data) {
2006 freed_mem += n->entry->size;
2007 FREE_AND_NULL(n->data);
2008 }
2009 n->entry = NULL;
2010 n->depth = 0;
2011 return freed_mem;
2012 }
2013
2014 static void find_deltas(struct object_entry **list, unsigned *list_size,
2015 int window, int depth, unsigned *processed)
2016 {
2017 uint32_t i, idx = 0, count = 0;
2018 struct unpacked *array;
2019 unsigned long mem_usage = 0;
2020
2021 array = xcalloc(window, sizeof(struct unpacked));
2022
2023 for (;;) {
2024 struct object_entry *entry;
2025 struct unpacked *n = array + idx;
2026 int j, max_depth, best_base = -1;
2027
2028 progress_lock();
2029 if (!*list_size) {
2030 progress_unlock();
2031 break;
2032 }
2033 entry = *list++;
2034 (*list_size)--;
2035 if (!entry->preferred_base) {
2036 (*processed)++;
2037 display_progress(progress_state, *processed);
2038 }
2039 progress_unlock();
2040
2041 mem_usage -= free_unpacked(n);
2042 n->entry = entry;
2043
2044 while (window_memory_limit &&
2045 mem_usage > window_memory_limit &&
2046 count > 1) {
2047 uint32_t tail = (idx + window - count) % window;
2048 mem_usage -= free_unpacked(array + tail);
2049 count--;
2050 }
2051
2052 /* We do not compute delta to *create* objects we are not
2053 * going to pack.
2054 */
2055 if (entry->preferred_base)
2056 goto next;
2057
2058 /*
2059 * If the current object is at pack edge, take the depth the
2060 * objects that depend on the current object into account
2061 * otherwise they would become too deep.
2062 */
2063 max_depth = depth;
2064 if (DELTA_CHILD(entry)) {
2065 max_depth -= check_delta_limit(entry, 0);
2066 if (max_depth <= 0)
2067 goto next;
2068 }
2069
2070 j = window;
2071 while (--j > 0) {
2072 int ret;
2073 uint32_t other_idx = idx + j;
2074 struct unpacked *m;
2075 if (other_idx >= window)
2076 other_idx -= window;
2077 m = array + other_idx;
2078 if (!m->entry)
2079 break;
2080 ret = try_delta(n, m, max_depth, &mem_usage);
2081 if (ret < 0)
2082 break;
2083 else if (ret > 0)
2084 best_base = other_idx;
2085 }
2086
2087 /*
2088 * If we decided to cache the delta data, then it is best
2089 * to compress it right away. First because we have to do
2090 * it anyway, and doing it here while we're threaded will
2091 * save a lot of time in the non threaded write phase,
2092 * as well as allow for caching more deltas within
2093 * the same cache size limit.
2094 * ...
2095 * But only if not writing to stdout, since in that case
2096 * the network is most likely throttling writes anyway,
2097 * and therefore it is best to go to the write phase ASAP
2098 * instead, as we can afford spending more time compressing
2099 * between writes at that moment.
2100 */
2101 if (entry->delta_data && !pack_to_stdout) {
2102 entry->z_delta_size = do_compress(&entry->delta_data,
2103 entry->delta_size);
2104 cache_lock();
2105 delta_cache_size -= entry->delta_size;
2106 delta_cache_size += entry->z_delta_size;
2107 cache_unlock();
2108 }
2109
2110 /* if we made n a delta, and if n is already at max
2111 * depth, leaving it in the window is pointless. we
2112 * should evict it first.
2113 */
2114 if (DELTA(entry) && max_depth <= n->depth)
2115 continue;
2116
2117 /*
2118 * Move the best delta base up in the window, after the
2119 * currently deltified object, to keep it longer. It will
2120 * be the first base object to be attempted next.
2121 */
2122 if (DELTA(entry)) {
2123 struct unpacked swap = array[best_base];
2124 int dist = (window + idx - best_base) % window;
2125 int dst = best_base;
2126 while (dist--) {
2127 int src = (dst + 1) % window;
2128 array[dst] = array[src];
2129 dst = src;
2130 }
2131 array[dst] = swap;
2132 }
2133
2134 next:
2135 idx++;
2136 if (count + 1 < window)
2137 count++;
2138 if (idx >= window)
2139 idx = 0;
2140 }
2141
2142 for (i = 0; i < window; ++i) {
2143 free_delta_index(array[i].index);
2144 free(array[i].data);
2145 }
2146 free(array);
2147 }
2148
2149 #ifndef NO_PTHREADS
2150
2151 static void try_to_free_from_threads(size_t size)
2152 {
2153 read_lock();
2154 release_pack_memory(size);
2155 read_unlock();
2156 }
2157
2158 static try_to_free_t old_try_to_free_routine;
2159
2160 /*
2161 * The main thread waits on the condition that (at least) one of the workers
2162 * has stopped working (which is indicated in the .working member of
2163 * struct thread_params).
2164 * When a work thread has completed its work, it sets .working to 0 and
2165 * signals the main thread and waits on the condition that .data_ready
2166 * becomes 1.
2167 */
2168
2169 struct thread_params {
2170 pthread_t thread;
2171 struct object_entry **list;
2172 unsigned list_size;
2173 unsigned remaining;
2174 int window;
2175 int depth;
2176 int working;
2177 int data_ready;
2178 pthread_mutex_t mutex;
2179 pthread_cond_t cond;
2180 unsigned *processed;
2181 };
2182
2183 static pthread_cond_t progress_cond;
2184
2185 /*
2186 * Mutex and conditional variable can't be statically-initialized on Windows.
2187 */
2188 static void init_threaded_search(void)
2189 {
2190 init_recursive_mutex(&read_mutex);
2191 pthread_mutex_init(&cache_mutex, NULL);
2192 pthread_mutex_init(&progress_mutex, NULL);
2193 pthread_cond_init(&progress_cond, NULL);
2194 old_try_to_free_routine = set_try_to_free_routine(try_to_free_from_threads);
2195 }
2196
2197 static void cleanup_threaded_search(void)
2198 {
2199 set_try_to_free_routine(old_try_to_free_routine);
2200 pthread_cond_destroy(&progress_cond);
2201 pthread_mutex_destroy(&read_mutex);
2202 pthread_mutex_destroy(&cache_mutex);
2203 pthread_mutex_destroy(&progress_mutex);
2204 }
2205
2206 static void *threaded_find_deltas(void *arg)
2207 {
2208 struct thread_params *me = arg;
2209
2210 progress_lock();
2211 while (me->remaining) {
2212 progress_unlock();
2213
2214 find_deltas(me->list, &me->remaining,
2215 me->window, me->depth, me->processed);
2216
2217 progress_lock();
2218 me->working = 0;
2219 pthread_cond_signal(&progress_cond);
2220 progress_unlock();
2221
2222 /*
2223 * We must not set ->data_ready before we wait on the
2224 * condition because the main thread may have set it to 1
2225 * before we get here. In order to be sure that new
2226 * work is available if we see 1 in ->data_ready, it
2227 * was initialized to 0 before this thread was spawned
2228 * and we reset it to 0 right away.
2229 */
2230 pthread_mutex_lock(&me->mutex);
2231 while (!me->data_ready)
2232 pthread_cond_wait(&me->cond, &me->mutex);
2233 me->data_ready = 0;
2234 pthread_mutex_unlock(&me->mutex);
2235
2236 progress_lock();
2237 }
2238 progress_unlock();
2239 /* leave ->working 1 so that this doesn't get more work assigned */
2240 return NULL;
2241 }
2242
2243 static void ll_find_deltas(struct object_entry **list, unsigned list_size,
2244 int window, int depth, unsigned *processed)
2245 {
2246 struct thread_params *p;
2247 int i, ret, active_threads = 0;
2248
2249 init_threaded_search();
2250
2251 if (delta_search_threads <= 1) {
2252 find_deltas(list, &list_size, window, depth, processed);
2253 cleanup_threaded_search();
2254 return;
2255 }
2256 if (progress > pack_to_stdout)
2257 fprintf(stderr, "Delta compression using up to %d threads.\n",
2258 delta_search_threads);
2259 p = xcalloc(delta_search_threads, sizeof(*p));
2260
2261 /* Partition the work amongst work threads. */
2262 for (i = 0; i < delta_search_threads; i++) {
2263 unsigned sub_size = list_size / (delta_search_threads - i);
2264
2265 /* don't use too small segments or no deltas will be found */
2266 if (sub_size < 2*window && i+1 < delta_search_threads)
2267 sub_size = 0;
2268
2269 p[i].window = window;
2270 p[i].depth = depth;
2271 p[i].processed = processed;
2272 p[i].working = 1;
2273 p[i].data_ready = 0;
2274
2275 /* try to split chunks on "path" boundaries */
2276 while (sub_size && sub_size < list_size &&
2277 list[sub_size]->hash &&
2278 list[sub_size]->hash == list[sub_size-1]->hash)
2279 sub_size++;
2280
2281 p[i].list = list;
2282 p[i].list_size = sub_size;
2283 p[i].remaining = sub_size;
2284
2285 list += sub_size;
2286 list_size -= sub_size;
2287 }
2288
2289 /* Start work threads. */
2290 for (i = 0; i < delta_search_threads; i++) {
2291 if (!p[i].list_size)
2292 continue;
2293 pthread_mutex_init(&p[i].mutex, NULL);
2294 pthread_cond_init(&p[i].cond, NULL);
2295 ret = pthread_create(&p[i].thread, NULL,
2296 threaded_find_deltas, &p[i]);
2297 if (ret)
2298 die("unable to create thread: %s", strerror(ret));
2299 active_threads++;
2300 }
2301
2302 /*
2303 * Now let's wait for work completion. Each time a thread is done
2304 * with its work, we steal half of the remaining work from the
2305 * thread with the largest number of unprocessed objects and give
2306 * it to that newly idle thread. This ensure good load balancing
2307 * until the remaining object list segments are simply too short
2308 * to be worth splitting anymore.
2309 */
2310 while (active_threads) {
2311 struct thread_params *target = NULL;
2312 struct thread_params *victim = NULL;
2313 unsigned sub_size = 0;
2314
2315 progress_lock();
2316 for (;;) {
2317 for (i = 0; !target && i < delta_search_threads; i++)
2318 if (!p[i].working)
2319 target = &p[i];
2320 if (target)
2321 break;
2322 pthread_cond_wait(&progress_cond, &progress_mutex);
2323 }
2324
2325 for (i = 0; i < delta_search_threads; i++)
2326 if (p[i].remaining > 2*window &&
2327 (!victim || victim->remaining < p[i].remaining))
2328 victim = &p[i];
2329 if (victim) {
2330 sub_size = victim->remaining / 2;
2331 list = victim->list + victim->list_size - sub_size;
2332 while (sub_size && list[0]->hash &&
2333 list[0]->hash == list[-1]->hash) {
2334 list++;
2335 sub_size--;
2336 }
2337 if (!sub_size) {
2338 /*
2339 * It is possible for some "paths" to have
2340 * so many objects that no hash boundary
2341 * might be found. Let's just steal the
2342 * exact half in that case.
2343 */
2344 sub_size = victim->remaining / 2;
2345 list -= sub_size;
2346 }
2347 target->list = list;
2348 victim->list_size -= sub_size;
2349 victim->remaining -= sub_size;
2350 }
2351 target->list_size = sub_size;
2352 target->remaining = sub_size;
2353 target->working = 1;
2354 progress_unlock();
2355
2356 pthread_mutex_lock(&target->mutex);
2357 target->data_ready = 1;
2358 pthread_cond_signal(&target->cond);
2359 pthread_mutex_unlock(&target->mutex);
2360
2361 if (!sub_size) {
2362 pthread_join(target->thread, NULL);
2363 pthread_cond_destroy(&target->cond);
2364 pthread_mutex_destroy(&target->mutex);
2365 active_threads--;
2366 }
2367 }
2368 cleanup_threaded_search();
2369 free(p);
2370 }
2371
2372 #else
2373 #define ll_find_deltas(l, s, w, d, p) find_deltas(l, &s, w, d, p)
2374 #endif
2375
2376 static void add_tag_chain(const struct object_id *oid)
2377 {
2378 struct tag *tag;
2379
2380 /*
2381 * We catch duplicates already in add_object_entry(), but we'd
2382 * prefer to do this extra check to avoid having to parse the
2383 * tag at all if we already know that it's being packed (e.g., if
2384 * it was included via bitmaps, we would not have parsed it
2385 * previously).
2386 */
2387 if (packlist_find(&to_pack, oid->hash, NULL))
2388 return;
2389
2390 tag = lookup_tag(oid);
2391 while (1) {
2392 if (!tag || parse_tag(tag) || !tag->tagged)
2393 die("unable to pack objects reachable from tag %s",
2394 oid_to_hex(oid));
2395
2396 add_object_entry(&tag->object.oid, OBJ_TAG, NULL, 0);
2397
2398 if (tag->tagged->type != OBJ_TAG)
2399 return;
2400
2401 tag = (struct tag *)tag->tagged;
2402 }
2403 }
2404
2405 static int add_ref_tag(const char *path, const struct object_id *oid, int flag, void *cb_data)
2406 {
2407 struct object_id peeled;
2408
2409 if (starts_with(path, "refs/tags/") && /* is a tag? */
2410 !peel_ref(path, &peeled) && /* peelable? */
2411 packlist_find(&to_pack, peeled.hash, NULL)) /* object packed? */
2412 add_tag_chain(oid);
2413 return 0;
2414 }
2415
2416 static void prepare_pack(int window, int depth)
2417 {
2418 struct object_entry **delta_list;
2419 uint32_t i, nr_deltas;
2420 unsigned n;
2421
2422 get_object_details();
2423
2424 /*
2425 * If we're locally repacking then we need to be doubly careful
2426 * from now on in order to make sure no stealth corruption gets
2427 * propagated to the new pack. Clients receiving streamed packs
2428 * should validate everything they get anyway so no need to incur
2429 * the additional cost here in that case.
2430 */
2431 if (!pack_to_stdout)
2432 do_check_packed_object_crc = 1;
2433
2434 if (!to_pack.nr_objects || !window || !depth)
2435 return;
2436
2437 ALLOC_ARRAY(delta_list, to_pack.nr_objects);
2438 nr_deltas = n = 0;
2439
2440 for (i = 0; i < to_pack.nr_objects; i++) {
2441 struct object_entry *entry = to_pack.objects + i;
2442
2443 if (DELTA(entry))
2444 /* This happens if we decided to reuse existing
2445 * delta from a pack. "reuse_delta &&" is implied.
2446 */
2447 continue;
2448
2449 if (entry->size < 50)
2450 continue;
2451
2452 if (entry->no_try_delta)
2453 continue;
2454
2455 if (!entry->preferred_base) {
2456 nr_deltas++;
2457 if (oe_type(entry) < 0)
2458 die("unable to get type of object %s",
2459 oid_to_hex(&entry->idx.oid));
2460 } else {
2461 if (oe_type(entry) < 0) {
2462 /*
2463 * This object is not found, but we
2464 * don't have to include it anyway.
2465 */
2466 continue;
2467 }
2468 }
2469
2470 delta_list[n++] = entry;
2471 }
2472
2473 if (nr_deltas && n > 1) {
2474 unsigned nr_done = 0;
2475 if (progress)
2476 progress_state = start_progress(_("Compressing objects"),
2477 nr_deltas);
2478 QSORT(delta_list, n, type_size_sort);
2479 ll_find_deltas(delta_list, n, window+1, depth, &nr_done);
2480 stop_progress(&progress_state);
2481 if (nr_done != nr_deltas)
2482 die("inconsistency with delta count");
2483 }
2484 free(delta_list);
2485 }
2486
2487 static int git_pack_config(const char *k, const char *v, void *cb)
2488 {
2489 if (!strcmp(k, "pack.window")) {
2490 window = git_config_int(k, v);
2491 return 0;
2492 }
2493 if (!strcmp(k, "pack.windowmemory")) {
2494 window_memory_limit = git_config_ulong(k, v);
2495 return 0;
2496 }
2497 if (!strcmp(k, "pack.depth")) {
2498 depth = git_config_int(k, v);
2499 return 0;
2500 }
2501 if (!strcmp(k, "pack.deltacachesize")) {
2502 max_delta_cache_size = git_config_int(k, v);
2503 return 0;
2504 }
2505 if (!strcmp(k, "pack.deltacachelimit")) {
2506 cache_max_small_delta_size = git_config_int(k, v);
2507 return 0;
2508 }
2509 if (!strcmp(k, "pack.writebitmaphashcache")) {
2510 if (git_config_bool(k, v))
2511 write_bitmap_options |= BITMAP_OPT_HASH_CACHE;
2512 else
2513 write_bitmap_options &= ~BITMAP_OPT_HASH_CACHE;
2514 }
2515 if (!strcmp(k, "pack.usebitmaps")) {
2516 use_bitmap_index_default = git_config_bool(k, v);
2517 return 0;
2518 }
2519 if (!strcmp(k, "pack.threads")) {
2520 delta_search_threads = git_config_int(k, v);
2521 if (delta_search_threads < 0)
2522 die("invalid number of threads specified (%d)",
2523 delta_search_threads);
2524 #ifdef NO_PTHREADS
2525 if (delta_search_threads != 1) {
2526 warning("no threads support, ignoring %s", k);
2527 delta_search_threads = 0;
2528 }
2529 #endif
2530 return 0;
2531 }
2532 if (!strcmp(k, "pack.indexversion")) {
2533 pack_idx_opts.version = git_config_int(k, v);
2534 if (pack_idx_opts.version > 2)
2535 die("bad pack.indexversion=%"PRIu32,
2536 pack_idx_opts.version);
2537 return 0;
2538 }
2539 return git_default_config(k, v, cb);
2540 }
2541
2542 static void read_object_list_from_stdin(void)
2543 {
2544 char line[GIT_MAX_HEXSZ + 1 + PATH_MAX + 2];
2545 struct object_id oid;
2546 const char *p;
2547
2548 for (;;) {
2549 if (!fgets(line, sizeof(line), stdin)) {
2550 if (feof(stdin))
2551 break;
2552 if (!ferror(stdin))
2553 die("fgets returned NULL, not EOF, not error!");
2554 if (errno != EINTR)
2555 die_errno("fgets");
2556 clearerr(stdin);
2557 continue;
2558 }
2559 if (line[0] == '-') {
2560 if (get_oid_hex(line+1, &oid))
2561 die("expected edge object ID, got garbage:\n %s",
2562 line);
2563 add_preferred_base(&oid);
2564 continue;
2565 }
2566 if (parse_oid_hex(line, &oid, &p))
2567 die("expected object ID, got garbage:\n %s", line);
2568
2569 add_preferred_base_object(p + 1);
2570 add_object_entry(&oid, OBJ_NONE, p + 1, 0);
2571 }
2572 }
2573
2574 /* Remember to update object flag allocation in object.h */
2575 #define OBJECT_ADDED (1u<<20)
2576
2577 static void show_commit(struct commit *commit, void *data)
2578 {
2579 add_object_entry(&commit->object.oid, OBJ_COMMIT, NULL, 0);
2580 commit->object.flags |= OBJECT_ADDED;
2581
2582 if (write_bitmap_index)
2583 index_commit_for_bitmap(commit);
2584 }
2585
2586 static void show_object(struct object *obj, const char *name, void *data)
2587 {
2588 add_preferred_base_object(name);
2589 add_object_entry(&obj->oid, obj->type, name, 0);
2590 obj->flags |= OBJECT_ADDED;
2591 }
2592
2593 static void show_object__ma_allow_any(struct object *obj, const char *name, void *data)
2594 {
2595 assert(arg_missing_action == MA_ALLOW_ANY);
2596
2597 /*
2598 * Quietly ignore ALL missing objects. This avoids problems with
2599 * staging them now and getting an odd error later.
2600 */
2601 if (!has_object_file(&obj->oid))
2602 return;
2603
2604 show_object(obj, name, data);
2605 }
2606
2607 static void show_object__ma_allow_promisor(struct object *obj, const char *name, void *data)
2608 {
2609 assert(arg_missing_action == MA_ALLOW_PROMISOR);
2610
2611 /*
2612 * Quietly ignore EXPECTED missing objects. This avoids problems with
2613 * staging them now and getting an odd error later.
2614 */
2615 if (!has_object_file(&obj->oid) && is_promisor_object(&obj->oid))
2616 return;
2617
2618 show_object(obj, name, data);
2619 }
2620
2621 static int option_parse_missing_action(const struct option *opt,
2622 const char *arg, int unset)
2623 {
2624 assert(arg);
2625 assert(!unset);
2626
2627 if (!strcmp(arg, "error")) {
2628 arg_missing_action = MA_ERROR;
2629 fn_show_object = show_object;
2630 return 0;
2631 }
2632
2633 if (!strcmp(arg, "allow-any")) {
2634 arg_missing_action = MA_ALLOW_ANY;
2635 fetch_if_missing = 0;
2636 fn_show_object = show_object__ma_allow_any;
2637 return 0;
2638 }
2639
2640 if (!strcmp(arg, "allow-promisor")) {
2641 arg_missing_action = MA_ALLOW_PROMISOR;
2642 fetch_if_missing = 0;
2643 fn_show_object = show_object__ma_allow_promisor;
2644 return 0;
2645 }
2646
2647 die(_("invalid value for --missing"));
2648 return 0;
2649 }
2650
2651 static void show_edge(struct commit *commit)
2652 {
2653 add_preferred_base(&commit->object.oid);
2654 }
2655
2656 struct in_pack_object {
2657 off_t offset;
2658 struct object *object;
2659 };
2660
2661 struct in_pack {
2662 unsigned int alloc;
2663 unsigned int nr;
2664 struct in_pack_object *array;
2665 };
2666
2667 static void mark_in_pack_object(struct object *object, struct packed_git *p, struct in_pack *in_pack)
2668 {
2669 in_pack->array[in_pack->nr].offset = find_pack_entry_one(object->oid.hash, p);
2670 in_pack->array[in_pack->nr].object = object;
2671 in_pack->nr++;
2672 }
2673
2674 /*
2675 * Compare the objects in the offset order, in order to emulate the
2676 * "git rev-list --objects" output that produced the pack originally.
2677 */
2678 static int ofscmp(const void *a_, const void *b_)
2679 {
2680 struct in_pack_object *a = (struct in_pack_object *)a_;
2681 struct in_pack_object *b = (struct in_pack_object *)b_;
2682
2683 if (a->offset < b->offset)
2684 return -1;
2685 else if (a->offset > b->offset)
2686 return 1;
2687 else
2688 return oidcmp(&a->object->oid, &b->object->oid);
2689 }
2690
2691 static void add_objects_in_unpacked_packs(struct rev_info *revs)
2692 {
2693 struct packed_git *p;
2694 struct in_pack in_pack;
2695 uint32_t i;
2696
2697 memset(&in_pack, 0, sizeof(in_pack));
2698
2699 for (p = get_packed_git(the_repository); p; p = p->next) {
2700 struct object_id oid;
2701 struct object *o;
2702
2703 if (!p->pack_local || p->pack_keep)
2704 continue;
2705 if (open_pack_index(p))
2706 die("cannot open pack index");
2707
2708 ALLOC_GROW(in_pack.array,
2709 in_pack.nr + p->num_objects,
2710 in_pack.alloc);
2711
2712 for (i = 0; i < p->num_objects; i++) {
2713 nth_packed_object_oid(&oid, p, i);
2714 o = lookup_unknown_object(oid.hash);
2715 if (!(o->flags & OBJECT_ADDED))
2716 mark_in_pack_object(o, p, &in_pack);
2717 o->flags |= OBJECT_ADDED;
2718 }
2719 }
2720
2721 if (in_pack.nr) {
2722 QSORT(in_pack.array, in_pack.nr, ofscmp);
2723 for (i = 0; i < in_pack.nr; i++) {
2724 struct object *o = in_pack.array[i].object;
2725 add_object_entry(&o->oid, o->type, "", 0);
2726 }
2727 }
2728 free(in_pack.array);
2729 }
2730
2731 static int add_loose_object(const struct object_id *oid, const char *path,
2732 void *data)
2733 {
2734 enum object_type type = oid_object_info(oid, NULL);
2735
2736 if (type < 0) {
2737 warning("loose object at %s could not be examined", path);
2738 return 0;
2739 }
2740
2741 add_object_entry(oid, type, "", 0);
2742 return 0;
2743 }
2744
2745 /*
2746 * We actually don't even have to worry about reachability here.
2747 * add_object_entry will weed out duplicates, so we just add every
2748 * loose object we find.
2749 */
2750 static void add_unreachable_loose_objects(void)
2751 {
2752 for_each_loose_file_in_objdir(get_object_directory(),
2753 add_loose_object,
2754 NULL, NULL, NULL);
2755 }
2756
2757 static int has_sha1_pack_kept_or_nonlocal(const struct object_id *oid)
2758 {
2759 static struct packed_git *last_found = (void *)1;
2760 struct packed_git *p;
2761
2762 p = (last_found != (void *)1) ? last_found :
2763 get_packed_git(the_repository);
2764
2765 while (p) {
2766 if ((!p->pack_local || p->pack_keep) &&
2767 find_pack_entry_one(oid->hash, p)) {
2768 last_found = p;
2769 return 1;
2770 }
2771 if (p == last_found)
2772 p = get_packed_git(the_repository);
2773 else
2774 p = p->next;
2775 if (p == last_found)
2776 p = p->next;
2777 }
2778 return 0;
2779 }
2780
2781 /*
2782 * Store a list of sha1s that are should not be discarded
2783 * because they are either written too recently, or are
2784 * reachable from another object that was.
2785 *
2786 * This is filled by get_object_list.
2787 */
2788 static struct oid_array recent_objects;
2789
2790 static int loosened_object_can_be_discarded(const struct object_id *oid,
2791 timestamp_t mtime)
2792 {
2793 if (!unpack_unreachable_expiration)
2794 return 0;
2795 if (mtime > unpack_unreachable_expiration)
2796 return 0;
2797 if (oid_array_lookup(&recent_objects, oid) >= 0)
2798 return 0;
2799 return 1;
2800 }
2801
2802 static void loosen_unused_packed_objects(struct rev_info *revs)
2803 {
2804 struct packed_git *p;
2805 uint32_t i;
2806 struct object_id oid;
2807
2808 for (p = get_packed_git(the_repository); p; p = p->next) {
2809 if (!p->pack_local || p->pack_keep)
2810 continue;
2811
2812 if (open_pack_index(p))
2813 die("cannot open pack index");
2814
2815 for (i = 0; i < p->num_objects; i++) {
2816 nth_packed_object_oid(&oid, p, i);
2817 if (!packlist_find(&to_pack, oid.hash, NULL) &&
2818 !has_sha1_pack_kept_or_nonlocal(&oid) &&
2819 !loosened_object_can_be_discarded(&oid, p->mtime))
2820 if (force_object_loose(&oid, p->mtime))
2821 die("unable to force loose object");
2822 }
2823 }
2824 }
2825
2826 /*
2827 * This tracks any options which pack-reuse code expects to be on, or which a
2828 * reader of the pack might not understand, and which would therefore prevent
2829 * blind reuse of what we have on disk.
2830 */
2831 static int pack_options_allow_reuse(void)
2832 {
2833 return pack_to_stdout &&
2834 allow_ofs_delta &&
2835 !ignore_packed_keep &&
2836 (!local || !have_non_local_packs) &&
2837 !incremental;
2838 }
2839
2840 static int get_object_list_from_bitmap(struct rev_info *revs)
2841 {
2842 if (prepare_bitmap_walk(revs) < 0)
2843 return -1;
2844
2845 if (pack_options_allow_reuse() &&
2846 !reuse_partial_packfile_from_bitmap(
2847 &reuse_packfile,
2848 &reuse_packfile_objects,
2849 &reuse_packfile_offset)) {
2850 assert(reuse_packfile_objects);
2851 nr_result += reuse_packfile_objects;
2852 display_progress(progress_state, nr_result);
2853 }
2854
2855 traverse_bitmap_commit_list(&add_object_entry_from_bitmap);
2856 return 0;
2857 }
2858
2859 static void record_recent_object(struct object *obj,
2860 const char *name,
2861 void *data)
2862 {
2863 oid_array_append(&recent_objects, &obj->oid);
2864 }
2865
2866 static void record_recent_commit(struct commit *commit, void *data)
2867 {
2868 oid_array_append(&recent_objects, &commit->object.oid);
2869 }
2870
2871 static void get_object_list(int ac, const char **av)
2872 {
2873 struct rev_info revs;
2874 char line[1000];
2875 int flags = 0;
2876
2877 init_revisions(&revs, NULL);
2878 save_commit_buffer = 0;
2879 setup_revisions(ac, av, &revs, NULL);
2880
2881 /* make sure shallows are read */
2882 is_repository_shallow();
2883
2884 while (fgets(line, sizeof(line), stdin) != NULL) {
2885 int len = strlen(line);
2886 if (len && line[len - 1] == '\n')
2887 line[--len] = 0;
2888 if (!len)
2889 break;
2890 if (*line == '-') {
2891 if (!strcmp(line, "--not")) {
2892 flags ^= UNINTERESTING;
2893 write_bitmap_index = 0;
2894 continue;
2895 }
2896 if (starts_with(line, "--shallow ")) {
2897 struct object_id oid;
2898 if (get_oid_hex(line + 10, &oid))
2899 die("not an SHA-1 '%s'", line + 10);
2900 register_shallow(&oid);
2901 use_bitmap_index = 0;
2902 continue;
2903 }
2904 die("not a rev '%s'", line);
2905 }
2906 if (handle_revision_arg(line, &revs, flags, REVARG_CANNOT_BE_FILENAME))
2907 die("bad revision '%s'", line);
2908 }
2909
2910 if (use_bitmap_index && !get_object_list_from_bitmap(&revs))
2911 return;
2912
2913 if (prepare_revision_walk(&revs))
2914 die("revision walk setup failed");
2915 mark_edges_uninteresting(&revs, show_edge);
2916
2917 if (!fn_show_object)
2918 fn_show_object = show_object;
2919 traverse_commit_list_filtered(&filter_options, &revs,
2920 show_commit, fn_show_object, NULL,
2921 NULL);
2922
2923 if (unpack_unreachable_expiration) {
2924 revs.ignore_missing_links = 1;
2925 if (add_unseen_recent_objects_to_traversal(&revs,
2926 unpack_unreachable_expiration))
2927 die("unable to add recent objects");
2928 if (prepare_revision_walk(&revs))
2929 die("revision walk setup failed");
2930 traverse_commit_list(&revs, record_recent_commit,
2931 record_recent_object, NULL);
2932 }
2933
2934 if (keep_unreachable)
2935 add_objects_in_unpacked_packs(&revs);
2936 if (pack_loose_unreachable)
2937 add_unreachable_loose_objects();
2938 if (unpack_unreachable)
2939 loosen_unused_packed_objects(&revs);
2940
2941 oid_array_clear(&recent_objects);
2942 }
2943
2944 static int option_parse_index_version(const struct option *opt,
2945 const char *arg, int unset)
2946 {
2947 char *c;
2948 const char *val = arg;
2949 pack_idx_opts.version = strtoul(val, &c, 10);
2950 if (pack_idx_opts.version > 2)
2951 die(_("unsupported index version %s"), val);
2952 if (*c == ',' && c[1])
2953 pack_idx_opts.off32_limit = strtoul(c+1, &c, 0);
2954 if (*c || pack_idx_opts.off32_limit & 0x80000000)
2955 die(_("bad index version '%s'"), val);
2956 return 0;
2957 }
2958
2959 static int option_parse_unpack_unreachable(const struct option *opt,
2960 const char *arg, int unset)
2961 {
2962 if (unset) {
2963 unpack_unreachable = 0;
2964 unpack_unreachable_expiration = 0;
2965 }
2966 else {
2967 unpack_unreachable = 1;
2968 if (arg)
2969 unpack_unreachable_expiration = approxidate(arg);
2970 }
2971 return 0;
2972 }
2973
2974 int cmd_pack_objects(int argc, const char **argv, const char *prefix)
2975 {
2976 int use_internal_rev_list = 0;
2977 int thin = 0;
2978 int shallow = 0;
2979 int all_progress_implied = 0;
2980 struct argv_array rp = ARGV_ARRAY_INIT;
2981 int rev_list_unpacked = 0, rev_list_all = 0, rev_list_reflog = 0;
2982 int rev_list_index = 0;
2983 struct option pack_objects_options[] = {
2984 OPT_SET_INT('q', "quiet", &progress,
2985 N_("do not show progress meter"), 0),
2986 OPT_SET_INT(0, "progress", &progress,
2987 N_("show progress meter"), 1),
2988 OPT_SET_INT(0, "all-progress", &progress,
2989 N_("show progress meter during object writing phase"), 2),
2990 OPT_BOOL(0, "all-progress-implied",
2991 &all_progress_implied,
2992 N_("similar to --all-progress when progress meter is shown")),
2993 { OPTION_CALLBACK, 0, "index-version", NULL, N_("version[,offset]"),
2994 N_("write the pack index file in the specified idx format version"),
2995 0, option_parse_index_version },
2996 OPT_MAGNITUDE(0, "max-pack-size", &pack_size_limit,
2997 N_("maximum size of each output pack file")),
2998 OPT_BOOL(0, "local", &local,
2999 N_("ignore borrowed objects from alternate object store")),
3000 OPT_BOOL(0, "incremental", &incremental,
3001 N_("ignore packed objects")),
3002 OPT_INTEGER(0, "window", &window,
3003 N_("limit pack window by objects")),
3004 OPT_MAGNITUDE(0, "window-memory", &window_memory_limit,
3005 N_("limit pack window by memory in addition to object limit")),
3006 OPT_INTEGER(0, "depth", &depth,
3007 N_("maximum length of delta chain allowed in the resulting pack")),
3008 OPT_BOOL(0, "reuse-delta", &reuse_delta,
3009 N_("reuse existing deltas")),
3010 OPT_BOOL(0, "reuse-object", &reuse_object,
3011 N_("reuse existing objects")),
3012 OPT_BOOL(0, "delta-base-offset", &allow_ofs_delta,
3013 N_("use OFS_DELTA objects")),
3014 OPT_INTEGER(0, "threads", &delta_search_threads,
3015 N_("use threads when searching for best delta matches")),
3016 OPT_BOOL(0, "non-empty", &non_empty,
3017 N_("do not create an empty pack output")),
3018 OPT_BOOL(0, "revs", &use_internal_rev_list,
3019 N_("read revision arguments from standard input")),
3020 { OPTION_SET_INT, 0, "unpacked", &rev_list_unpacked, NULL,
3021 N_("limit the objects to those that are not yet packed"),
3022 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
3023 { OPTION_SET_INT, 0, "all", &rev_list_all, NULL,
3024 N_("include objects reachable from any reference"),
3025 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
3026 { OPTION_SET_INT, 0, "reflog", &rev_list_reflog, NULL,
3027 N_("include objects referred by reflog entries"),
3028 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
3029 { OPTION_SET_INT, 0, "indexed-objects", &rev_list_index, NULL,
3030 N_("include objects referred to by the index"),
3031 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
3032 OPT_BOOL(0, "stdout", &pack_to_stdout,
3033 N_("output pack to stdout")),
3034 OPT_BOOL(0, "include-tag", &include_tag,
3035 N_("include tag objects that refer to objects to be packed")),
3036 OPT_BOOL(0, "keep-unreachable", &keep_unreachable,
3037 N_("keep unreachable objects")),
3038 OPT_BOOL(0, "pack-loose-unreachable", &pack_loose_unreachable,
3039 N_("pack loose unreachable objects")),
3040 { OPTION_CALLBACK, 0, "unpack-unreachable", NULL, N_("time"),
3041 N_("unpack unreachable objects newer than <time>"),
3042 PARSE_OPT_OPTARG, option_parse_unpack_unreachable },
3043 OPT_BOOL(0, "thin", &thin,
3044 N_("create thin packs")),
3045 OPT_BOOL(0, "shallow", &shallow,
3046 N_("create packs suitable for shallow fetches")),
3047 OPT_BOOL(0, "honor-pack-keep", &ignore_packed_keep,
3048 N_("ignore packs that have companion .keep file")),
3049 OPT_INTEGER(0, "compression", &pack_compression_level,
3050 N_("pack compression level")),
3051 OPT_SET_INT(0, "keep-true-parents", &grafts_replace_parents,
3052 N_("do not hide commits by grafts"), 0),
3053 OPT_BOOL(0, "use-bitmap-index", &use_bitmap_index,
3054 N_("use a bitmap index if available to speed up counting objects")),
3055 OPT_BOOL(0, "write-bitmap-index", &write_bitmap_index,
3056 N_("write a bitmap index together with the pack index")),
3057 OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
3058 { OPTION_CALLBACK, 0, "missing", NULL, N_("action"),
3059 N_("handling for missing objects"), PARSE_OPT_NONEG,
3060 option_parse_missing_action },
3061 OPT_BOOL(0, "exclude-promisor-objects", &exclude_promisor_objects,
3062 N_("do not pack objects in promisor packfiles")),
3063 OPT_END(),
3064 };
3065
3066 if (DFS_NUM_STATES > (1 << OE_DFS_STATE_BITS))
3067 BUG("too many dfs states, increase OE_DFS_STATE_BITS");
3068
3069 check_replace_refs = 0;
3070
3071 reset_pack_idx_option(&pack_idx_opts);
3072 git_config(git_pack_config, NULL);
3073
3074 progress = isatty(2);
3075 argc = parse_options(argc, argv, prefix, pack_objects_options,
3076 pack_usage, 0);
3077
3078 if (argc) {
3079 base_name = argv[0];
3080 argc--;
3081 }
3082 if (pack_to_stdout != !base_name || argc)
3083 usage_with_options(pack_usage, pack_objects_options);
3084
3085 if (depth >= (1 << OE_DEPTH_BITS)) {
3086 warning(_("delta chain depth %d is too deep, forcing %d"),
3087 depth, (1 << OE_DEPTH_BITS) - 1);
3088 depth = (1 << OE_DEPTH_BITS) - 1;
3089 }
3090
3091 argv_array_push(&rp, "pack-objects");
3092 if (thin) {
3093 use_internal_rev_list = 1;
3094 argv_array_push(&rp, shallow
3095 ? "--objects-edge-aggressive"
3096 : "--objects-edge");
3097 } else
3098 argv_array_push(&rp, "--objects");
3099
3100 if (rev_list_all) {
3101 use_internal_rev_list = 1;
3102 argv_array_push(&rp, "--all");
3103 }
3104 if (rev_list_reflog) {
3105 use_internal_rev_list = 1;
3106 argv_array_push(&rp, "--reflog");
3107 }
3108 if (rev_list_index) {
3109 use_internal_rev_list = 1;
3110 argv_array_push(&rp, "--indexed-objects");
3111 }
3112 if (rev_list_unpacked) {
3113 use_internal_rev_list = 1;
3114 argv_array_push(&rp, "--unpacked");
3115 }
3116
3117 if (exclude_promisor_objects) {
3118 use_internal_rev_list = 1;
3119 fetch_if_missing = 0;
3120 argv_array_push(&rp, "--exclude-promisor-objects");
3121 }
3122
3123 if (!reuse_object)
3124 reuse_delta = 0;
3125 if (pack_compression_level == -1)
3126 pack_compression_level = Z_DEFAULT_COMPRESSION;
3127 else if (pack_compression_level < 0 || pack_compression_level > Z_BEST_COMPRESSION)
3128 die("bad pack compression level %d", pack_compression_level);
3129
3130 if (!delta_search_threads) /* --threads=0 means autodetect */
3131 delta_search_threads = online_cpus();
3132
3133 #ifdef NO_PTHREADS
3134 if (delta_search_threads != 1)
3135 warning("no threads support, ignoring --threads");
3136 #endif
3137 if (!pack_to_stdout && !pack_size_limit)
3138 pack_size_limit = pack_size_limit_cfg;
3139 if (pack_to_stdout && pack_size_limit)
3140 die("--max-pack-size cannot be used to build a pack for transfer.");
3141 if (pack_size_limit && pack_size_limit < 1024*1024) {
3142 warning("minimum pack size limit is 1 MiB");
3143 pack_size_limit = 1024*1024;
3144 }
3145
3146 if (!pack_to_stdout && thin)
3147 die("--thin cannot be used to build an indexable pack.");
3148
3149 if (keep_unreachable && unpack_unreachable)
3150 die("--keep-unreachable and --unpack-unreachable are incompatible.");
3151 if (!rev_list_all || !rev_list_reflog || !rev_list_index)
3152 unpack_unreachable_expiration = 0;
3153
3154 if (filter_options.choice) {
3155 if (!pack_to_stdout)
3156 die("cannot use --filter without --stdout.");
3157 use_bitmap_index = 0;
3158 }
3159
3160 /*
3161 * "soft" reasons not to use bitmaps - for on-disk repack by default we want
3162 *
3163 * - to produce good pack (with bitmap index not-yet-packed objects are
3164 * packed in suboptimal order).
3165 *
3166 * - to use more robust pack-generation codepath (avoiding possible
3167 * bugs in bitmap code and possible bitmap index corruption).
3168 */
3169 if (!pack_to_stdout)
3170 use_bitmap_index_default = 0;
3171
3172 if (use_bitmap_index < 0)
3173 use_bitmap_index = use_bitmap_index_default;
3174
3175 /* "hard" reasons not to use bitmaps; these just won't work at all */
3176 if (!use_internal_rev_list || (!pack_to_stdout && write_bitmap_index) || is_repository_shallow())
3177 use_bitmap_index = 0;
3178
3179 if (pack_to_stdout || !rev_list_all)
3180 write_bitmap_index = 0;
3181
3182 if (progress && all_progress_implied)
3183 progress = 2;
3184
3185 if (ignore_packed_keep) {
3186 struct packed_git *p;
3187 for (p = get_packed_git(the_repository); p; p = p->next)
3188 if (p->pack_local && p->pack_keep)
3189 break;
3190 if (!p) /* no keep-able packs found */
3191 ignore_packed_keep = 0;
3192 }
3193 if (local) {
3194 /*
3195 * unlike ignore_packed_keep above, we do not want to
3196 * unset "local" based on looking at packs, as it
3197 * also covers non-local objects
3198 */
3199 struct packed_git *p;
3200 for (p = get_packed_git(the_repository); p; p = p->next) {
3201 if (!p->pack_local) {
3202 have_non_local_packs = 1;
3203 break;
3204 }
3205 }
3206 }
3207
3208 prepare_packing_data(&to_pack);
3209
3210 if (progress)
3211 progress_state = start_progress(_("Counting objects"), 0);
3212 if (!use_internal_rev_list)
3213 read_object_list_from_stdin();
3214 else {
3215 get_object_list(rp.argc, rp.argv);
3216 argv_array_clear(&rp);
3217 }
3218 cleanup_preferred_base();
3219 if (include_tag && nr_result)
3220 for_each_ref(add_ref_tag, NULL);
3221 stop_progress(&progress_state);
3222
3223 if (non_empty && !nr_result)
3224 return 0;
3225 if (nr_result)
3226 prepare_pack(window, depth);
3227 write_pack_file();
3228 if (progress)
3229 fprintf(stderr, "Total %"PRIu32" (delta %"PRIu32"),"
3230 " reused %"PRIu32" (delta %"PRIu32")\n",
3231 written, written_delta, reused, reused_delta);
3232 return 0;
3233 }