Merge branch 'js/branch-track'
[git/git.git] / builtin-pack-objects.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "attr.h"
4 #include "object.h"
5 #include "blob.h"
6 #include "commit.h"
7 #include "tag.h"
8 #include "tree.h"
9 #include "delta.h"
10 #include "pack.h"
11 #include "csum-file.h"
12 #include "tree-walk.h"
13 #include "diff.h"
14 #include "revision.h"
15 #include "list-objects.h"
16 #include "progress.h"
17
18 #ifdef THREADED_DELTA_SEARCH
19 #include "thread-utils.h"
20 #include <pthread.h>
21 #endif
22
23 static const char pack_usage[] = "\
24 git-pack-objects [{ -q | --progress | --all-progress }] \n\
25 [--max-pack-size=N] [--local] [--incremental] \n\
26 [--window=N] [--window-memory=N] [--depth=N] \n\
27 [--no-reuse-delta] [--no-reuse-object] [--delta-base-offset] \n\
28 [--threads=N] [--non-empty] [--revs [--unpacked | --all]*] [--reflog] \n\
29 [--stdout | base-name] [--keep-unreachable] [<ref-list | <object-list]";
30
31 struct object_entry {
32 struct pack_idx_entry idx;
33 unsigned long size; /* uncompressed size */
34 struct packed_git *in_pack; /* already in pack */
35 off_t in_pack_offset;
36 struct object_entry *delta; /* delta base object */
37 struct object_entry *delta_child; /* deltified objects who bases me */
38 struct object_entry *delta_sibling; /* other deltified objects who
39 * uses the same base as me
40 */
41 void *delta_data; /* cached delta (uncompressed) */
42 unsigned long delta_size; /* delta data size (uncompressed) */
43 unsigned int hash; /* name hint hash */
44 enum object_type type;
45 enum object_type in_pack_type; /* could be delta */
46 unsigned char in_pack_header_size;
47 unsigned char preferred_base; /* we do not pack this, but is available
48 * to be used as the base object to delta
49 * objects against.
50 */
51 unsigned char no_try_delta;
52 };
53
54 /*
55 * Objects we are going to pack are collected in objects array (dynamically
56 * expanded). nr_objects & nr_alloc controls this array. They are stored
57 * in the order we see -- typically rev-list --objects order that gives us
58 * nice "minimum seek" order.
59 */
60 static struct object_entry *objects;
61 static struct pack_idx_entry **written_list;
62 static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
63
64 static int non_empty;
65 static int no_reuse_delta, no_reuse_object, keep_unreachable;
66 static int local;
67 static int incremental;
68 static int allow_ofs_delta;
69 static const char *base_name;
70 static int progress = 1;
71 static int window = 10;
72 static uint32_t pack_size_limit, pack_size_limit_cfg;
73 static int depth = 50;
74 static int delta_search_threads = 1;
75 static int pack_to_stdout;
76 static int num_preferred_base;
77 static struct progress *progress_state;
78 static int pack_compression_level = Z_DEFAULT_COMPRESSION;
79 static int pack_compression_seen;
80
81 static unsigned long delta_cache_size = 0;
82 static unsigned long max_delta_cache_size = 0;
83 static unsigned long cache_max_small_delta_size = 1000;
84
85 static unsigned long window_memory_limit = 0;
86
87 /*
88 * The object names in objects array are hashed with this hashtable,
89 * to help looking up the entry by object name.
90 * This hashtable is built after all the objects are seen.
91 */
92 static int *object_ix;
93 static int object_ix_hashsz;
94
95 /*
96 * Pack index for existing packs give us easy access to the offsets into
97 * corresponding pack file where each object's data starts, but the entries
98 * do not store the size of the compressed representation (uncompressed
99 * size is easily available by examining the pack entry header). It is
100 * also rather expensive to find the sha1 for an object given its offset.
101 *
102 * We build a hashtable of existing packs (pack_revindex), and keep reverse
103 * index here -- pack index file is sorted by object name mapping to offset;
104 * this pack_revindex[].revindex array is a list of offset/index_nr pairs
105 * ordered by offset, so if you know the offset of an object, next offset
106 * is where its packed representation ends and the index_nr can be used to
107 * get the object sha1 from the main index.
108 */
109 struct revindex_entry {
110 off_t offset;
111 unsigned int nr;
112 };
113 struct pack_revindex {
114 struct packed_git *p;
115 struct revindex_entry *revindex;
116 };
117 static struct pack_revindex *pack_revindex;
118 static int pack_revindex_hashsz;
119
120 /*
121 * stats
122 */
123 static uint32_t written, written_delta;
124 static uint32_t reused, reused_delta;
125
126 static int pack_revindex_ix(struct packed_git *p)
127 {
128 unsigned long ui = (unsigned long)p;
129 int i;
130
131 ui = ui ^ (ui >> 16); /* defeat structure alignment */
132 i = (int)(ui % pack_revindex_hashsz);
133 while (pack_revindex[i].p) {
134 if (pack_revindex[i].p == p)
135 return i;
136 if (++i == pack_revindex_hashsz)
137 i = 0;
138 }
139 return -1 - i;
140 }
141
142 static void prepare_pack_ix(void)
143 {
144 int num;
145 struct packed_git *p;
146 for (num = 0, p = packed_git; p; p = p->next)
147 num++;
148 if (!num)
149 return;
150 pack_revindex_hashsz = num * 11;
151 pack_revindex = xcalloc(sizeof(*pack_revindex), pack_revindex_hashsz);
152 for (p = packed_git; p; p = p->next) {
153 num = pack_revindex_ix(p);
154 num = - 1 - num;
155 pack_revindex[num].p = p;
156 }
157 /* revindex elements are lazily initialized */
158 }
159
160 static int cmp_offset(const void *a_, const void *b_)
161 {
162 const struct revindex_entry *a = a_;
163 const struct revindex_entry *b = b_;
164 return (a->offset < b->offset) ? -1 : (a->offset > b->offset) ? 1 : 0;
165 }
166
167 /*
168 * Ordered list of offsets of objects in the pack.
169 */
170 static void prepare_pack_revindex(struct pack_revindex *rix)
171 {
172 struct packed_git *p = rix->p;
173 int num_ent = p->num_objects;
174 int i;
175 const char *index = p->index_data;
176
177 rix->revindex = xmalloc(sizeof(*rix->revindex) * (num_ent + 1));
178 index += 4 * 256;
179
180 if (p->index_version > 1) {
181 const uint32_t *off_32 =
182 (uint32_t *)(index + 8 + p->num_objects * (20 + 4));
183 const uint32_t *off_64 = off_32 + p->num_objects;
184 for (i = 0; i < num_ent; i++) {
185 uint32_t off = ntohl(*off_32++);
186 if (!(off & 0x80000000)) {
187 rix->revindex[i].offset = off;
188 } else {
189 rix->revindex[i].offset =
190 ((uint64_t)ntohl(*off_64++)) << 32;
191 rix->revindex[i].offset |=
192 ntohl(*off_64++);
193 }
194 rix->revindex[i].nr = i;
195 }
196 } else {
197 for (i = 0; i < num_ent; i++) {
198 uint32_t hl = *((uint32_t *)(index + 24 * i));
199 rix->revindex[i].offset = ntohl(hl);
200 rix->revindex[i].nr = i;
201 }
202 }
203
204 /* This knows the pack format -- the 20-byte trailer
205 * follows immediately after the last object data.
206 */
207 rix->revindex[num_ent].offset = p->pack_size - 20;
208 rix->revindex[num_ent].nr = -1;
209 qsort(rix->revindex, num_ent, sizeof(*rix->revindex), cmp_offset);
210 }
211
212 static struct revindex_entry * find_packed_object(struct packed_git *p,
213 off_t ofs)
214 {
215 int num;
216 int lo, hi;
217 struct pack_revindex *rix;
218 struct revindex_entry *revindex;
219 num = pack_revindex_ix(p);
220 if (num < 0)
221 die("internal error: pack revindex uninitialized");
222 rix = &pack_revindex[num];
223 if (!rix->revindex)
224 prepare_pack_revindex(rix);
225 revindex = rix->revindex;
226 lo = 0;
227 hi = p->num_objects + 1;
228 do {
229 int mi = (lo + hi) / 2;
230 if (revindex[mi].offset == ofs) {
231 return revindex + mi;
232 }
233 else if (ofs < revindex[mi].offset)
234 hi = mi;
235 else
236 lo = mi + 1;
237 } while (lo < hi);
238 die("internal error: pack revindex corrupt");
239 }
240
241 static const unsigned char *find_packed_object_name(struct packed_git *p,
242 off_t ofs)
243 {
244 struct revindex_entry *entry = find_packed_object(p, ofs);
245 return nth_packed_object_sha1(p, entry->nr);
246 }
247
248 static void *delta_against(void *buf, unsigned long size, struct object_entry *entry)
249 {
250 unsigned long othersize, delta_size;
251 enum object_type type;
252 void *otherbuf = read_sha1_file(entry->delta->idx.sha1, &type, &othersize);
253 void *delta_buf;
254
255 if (!otherbuf)
256 die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
257 delta_buf = diff_delta(otherbuf, othersize,
258 buf, size, &delta_size, 0);
259 if (!delta_buf || delta_size != entry->delta_size)
260 die("delta size changed");
261 free(buf);
262 free(otherbuf);
263 return delta_buf;
264 }
265
266 /*
267 * The per-object header is a pretty dense thing, which is
268 * - first byte: low four bits are "size", then three bits of "type",
269 * and the high bit is "size continues".
270 * - each byte afterwards: low seven bits are size continuation,
271 * with the high bit being "size continues"
272 */
273 static int encode_header(enum object_type type, unsigned long size, unsigned char *hdr)
274 {
275 int n = 1;
276 unsigned char c;
277
278 if (type < OBJ_COMMIT || type > OBJ_REF_DELTA)
279 die("bad type %d", type);
280
281 c = (type << 4) | (size & 15);
282 size >>= 4;
283 while (size) {
284 *hdr++ = c | 0x80;
285 c = size & 0x7f;
286 size >>= 7;
287 n++;
288 }
289 *hdr = c;
290 return n;
291 }
292
293 /*
294 * we are going to reuse the existing object data as is. make
295 * sure it is not corrupt.
296 */
297 static int check_pack_inflate(struct packed_git *p,
298 struct pack_window **w_curs,
299 off_t offset,
300 off_t len,
301 unsigned long expect)
302 {
303 z_stream stream;
304 unsigned char fakebuf[4096], *in;
305 int st;
306
307 memset(&stream, 0, sizeof(stream));
308 inflateInit(&stream);
309 do {
310 in = use_pack(p, w_curs, offset, &stream.avail_in);
311 stream.next_in = in;
312 stream.next_out = fakebuf;
313 stream.avail_out = sizeof(fakebuf);
314 st = inflate(&stream, Z_FINISH);
315 offset += stream.next_in - in;
316 } while (st == Z_OK || st == Z_BUF_ERROR);
317 inflateEnd(&stream);
318 return (st == Z_STREAM_END &&
319 stream.total_out == expect &&
320 stream.total_in == len) ? 0 : -1;
321 }
322
323 static int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
324 off_t offset, off_t len, unsigned int nr)
325 {
326 const uint32_t *index_crc;
327 uint32_t data_crc = crc32(0, Z_NULL, 0);
328
329 do {
330 unsigned int avail;
331 void *data = use_pack(p, w_curs, offset, &avail);
332 if (avail > len)
333 avail = len;
334 data_crc = crc32(data_crc, data, avail);
335 offset += avail;
336 len -= avail;
337 } while (len);
338
339 index_crc = p->index_data;
340 index_crc += 2 + 256 + p->num_objects * (20/4) + nr;
341
342 return data_crc != ntohl(*index_crc);
343 }
344
345 static void copy_pack_data(struct sha1file *f,
346 struct packed_git *p,
347 struct pack_window **w_curs,
348 off_t offset,
349 off_t len)
350 {
351 unsigned char *in;
352 unsigned int avail;
353
354 while (len) {
355 in = use_pack(p, w_curs, offset, &avail);
356 if (avail > len)
357 avail = (unsigned int)len;
358 sha1write(f, in, avail);
359 offset += avail;
360 len -= avail;
361 }
362 }
363
364 static unsigned long write_object(struct sha1file *f,
365 struct object_entry *entry,
366 off_t write_offset)
367 {
368 unsigned long size;
369 enum object_type type;
370 void *buf;
371 unsigned char header[10];
372 unsigned char dheader[10];
373 unsigned hdrlen;
374 off_t datalen;
375 enum object_type obj_type;
376 int to_reuse = 0;
377 /* write limit if limited packsize and not first object */
378 unsigned long limit = pack_size_limit && nr_written ?
379 pack_size_limit - write_offset : 0;
380 /* no if no delta */
381 int usable_delta = !entry->delta ? 0 :
382 /* yes if unlimited packfile */
383 !pack_size_limit ? 1 :
384 /* no if base written to previous pack */
385 entry->delta->idx.offset == (off_t)-1 ? 0 :
386 /* otherwise double-check written to this
387 * pack, like we do below
388 */
389 entry->delta->idx.offset ? 1 : 0;
390
391 if (!pack_to_stdout)
392 crc32_begin(f);
393
394 obj_type = entry->type;
395 if (no_reuse_object)
396 to_reuse = 0; /* explicit */
397 else if (!entry->in_pack)
398 to_reuse = 0; /* can't reuse what we don't have */
399 else if (obj_type == OBJ_REF_DELTA || obj_type == OBJ_OFS_DELTA)
400 /* check_object() decided it for us ... */
401 to_reuse = usable_delta;
402 /* ... but pack split may override that */
403 else if (obj_type != entry->in_pack_type)
404 to_reuse = 0; /* pack has delta which is unusable */
405 else if (entry->delta)
406 to_reuse = 0; /* we want to pack afresh */
407 else
408 to_reuse = 1; /* we have it in-pack undeltified,
409 * and we do not need to deltify it.
410 */
411
412 if (!to_reuse) {
413 z_stream stream;
414 unsigned long maxsize;
415 void *out;
416 if (!usable_delta) {
417 buf = read_sha1_file(entry->idx.sha1, &obj_type, &size);
418 if (!buf)
419 die("unable to read %s", sha1_to_hex(entry->idx.sha1));
420 } else if (entry->delta_data) {
421 size = entry->delta_size;
422 buf = entry->delta_data;
423 entry->delta_data = NULL;
424 obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
425 OBJ_OFS_DELTA : OBJ_REF_DELTA;
426 } else {
427 buf = read_sha1_file(entry->idx.sha1, &type, &size);
428 if (!buf)
429 die("unable to read %s", sha1_to_hex(entry->idx.sha1));
430 buf = delta_against(buf, size, entry);
431 size = entry->delta_size;
432 obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
433 OBJ_OFS_DELTA : OBJ_REF_DELTA;
434 }
435 /* compress the data to store and put compressed length in datalen */
436 memset(&stream, 0, sizeof(stream));
437 deflateInit(&stream, pack_compression_level);
438 maxsize = deflateBound(&stream, size);
439 out = xmalloc(maxsize);
440 /* Compress it */
441 stream.next_in = buf;
442 stream.avail_in = size;
443 stream.next_out = out;
444 stream.avail_out = maxsize;
445 while (deflate(&stream, Z_FINISH) == Z_OK)
446 /* nothing */;
447 deflateEnd(&stream);
448 datalen = stream.total_out;
449
450 /*
451 * The object header is a byte of 'type' followed by zero or
452 * more bytes of length.
453 */
454 hdrlen = encode_header(obj_type, size, header);
455
456 if (obj_type == OBJ_OFS_DELTA) {
457 /*
458 * Deltas with relative base contain an additional
459 * encoding of the relative offset for the delta
460 * base from this object's position in the pack.
461 */
462 off_t ofs = entry->idx.offset - entry->delta->idx.offset;
463 unsigned pos = sizeof(dheader) - 1;
464 dheader[pos] = ofs & 127;
465 while (ofs >>= 7)
466 dheader[--pos] = 128 | (--ofs & 127);
467 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
468 free(out);
469 free(buf);
470 return 0;
471 }
472 sha1write(f, header, hdrlen);
473 sha1write(f, dheader + pos, sizeof(dheader) - pos);
474 hdrlen += sizeof(dheader) - pos;
475 } else if (obj_type == OBJ_REF_DELTA) {
476 /*
477 * Deltas with a base reference contain
478 * an additional 20 bytes for the base sha1.
479 */
480 if (limit && hdrlen + 20 + datalen + 20 >= limit) {
481 free(out);
482 free(buf);
483 return 0;
484 }
485 sha1write(f, header, hdrlen);
486 sha1write(f, entry->delta->idx.sha1, 20);
487 hdrlen += 20;
488 } else {
489 if (limit && hdrlen + datalen + 20 >= limit) {
490 free(out);
491 free(buf);
492 return 0;
493 }
494 sha1write(f, header, hdrlen);
495 }
496 sha1write(f, out, datalen);
497 free(out);
498 free(buf);
499 }
500 else {
501 struct packed_git *p = entry->in_pack;
502 struct pack_window *w_curs = NULL;
503 struct revindex_entry *revidx;
504 off_t offset;
505
506 if (entry->delta) {
507 obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
508 OBJ_OFS_DELTA : OBJ_REF_DELTA;
509 reused_delta++;
510 }
511 hdrlen = encode_header(obj_type, entry->size, header);
512 offset = entry->in_pack_offset;
513 revidx = find_packed_object(p, offset);
514 datalen = revidx[1].offset - offset;
515 if (!pack_to_stdout && p->index_version > 1 &&
516 check_pack_crc(p, &w_curs, offset, datalen, revidx->nr))
517 die("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
518 offset += entry->in_pack_header_size;
519 datalen -= entry->in_pack_header_size;
520 if (obj_type == OBJ_OFS_DELTA) {
521 off_t ofs = entry->idx.offset - entry->delta->idx.offset;
522 unsigned pos = sizeof(dheader) - 1;
523 dheader[pos] = ofs & 127;
524 while (ofs >>= 7)
525 dheader[--pos] = 128 | (--ofs & 127);
526 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit)
527 return 0;
528 sha1write(f, header, hdrlen);
529 sha1write(f, dheader + pos, sizeof(dheader) - pos);
530 hdrlen += sizeof(dheader) - pos;
531 } else if (obj_type == OBJ_REF_DELTA) {
532 if (limit && hdrlen + 20 + datalen + 20 >= limit)
533 return 0;
534 sha1write(f, header, hdrlen);
535 sha1write(f, entry->delta->idx.sha1, 20);
536 hdrlen += 20;
537 } else {
538 if (limit && hdrlen + datalen + 20 >= limit)
539 return 0;
540 sha1write(f, header, hdrlen);
541 }
542
543 if (!pack_to_stdout && p->index_version == 1 &&
544 check_pack_inflate(p, &w_curs, offset, datalen, entry->size))
545 die("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1));
546 copy_pack_data(f, p, &w_curs, offset, datalen);
547 unuse_pack(&w_curs);
548 reused++;
549 }
550 if (usable_delta)
551 written_delta++;
552 written++;
553 if (!pack_to_stdout)
554 entry->idx.crc32 = crc32_end(f);
555 return hdrlen + datalen;
556 }
557
558 static off_t write_one(struct sha1file *f,
559 struct object_entry *e,
560 off_t offset)
561 {
562 unsigned long size;
563
564 /* offset is non zero if object is written already. */
565 if (e->idx.offset || e->preferred_base)
566 return offset;
567
568 /* if we are deltified, write out base object first. */
569 if (e->delta) {
570 offset = write_one(f, e->delta, offset);
571 if (!offset)
572 return 0;
573 }
574
575 e->idx.offset = offset;
576 size = write_object(f, e, offset);
577 if (!size) {
578 e->idx.offset = 0;
579 return 0;
580 }
581 written_list[nr_written++] = &e->idx;
582
583 /* make sure off_t is sufficiently large not to wrap */
584 if (offset > offset + size)
585 die("pack too large for current definition of off_t");
586 return offset + size;
587 }
588
589 /* forward declaration for write_pack_file */
590 static int adjust_perm(const char *path, mode_t mode);
591
592 static void write_pack_file(void)
593 {
594 uint32_t i = 0, j;
595 struct sha1file *f;
596 off_t offset, offset_one, last_obj_offset = 0;
597 struct pack_header hdr;
598 int do_progress = progress >> pack_to_stdout;
599 uint32_t nr_remaining = nr_result;
600
601 if (do_progress)
602 progress_state = start_progress("Writing objects", nr_result);
603 written_list = xmalloc(nr_objects * sizeof(*written_list));
604
605 do {
606 unsigned char sha1[20];
607 char *pack_tmp_name = NULL;
608
609 if (pack_to_stdout) {
610 f = sha1fd_throughput(1, "<stdout>", progress_state);
611 } else {
612 char tmpname[PATH_MAX];
613 int fd;
614 snprintf(tmpname, sizeof(tmpname),
615 "%s/tmp_pack_XXXXXX", get_object_directory());
616 fd = xmkstemp(tmpname);
617 pack_tmp_name = xstrdup(tmpname);
618 f = sha1fd(fd, pack_tmp_name);
619 }
620
621 hdr.hdr_signature = htonl(PACK_SIGNATURE);
622 hdr.hdr_version = htonl(PACK_VERSION);
623 hdr.hdr_entries = htonl(nr_remaining);
624 sha1write(f, &hdr, sizeof(hdr));
625 offset = sizeof(hdr);
626 nr_written = 0;
627 for (; i < nr_objects; i++) {
628 last_obj_offset = offset;
629 offset_one = write_one(f, objects + i, offset);
630 if (!offset_one)
631 break;
632 offset = offset_one;
633 display_progress(progress_state, written);
634 }
635
636 /*
637 * Did we write the wrong # entries in the header?
638 * If so, rewrite it like in fast-import
639 */
640 if (pack_to_stdout || nr_written == nr_remaining) {
641 sha1close(f, sha1, 1);
642 } else {
643 int fd = sha1close(f, NULL, 0);
644 fixup_pack_header_footer(fd, sha1, pack_tmp_name, nr_written);
645 close(fd);
646 }
647
648 if (!pack_to_stdout) {
649 mode_t mode = umask(0);
650 char *idx_tmp_name, tmpname[PATH_MAX];
651
652 umask(mode);
653 mode = 0444 & ~mode;
654
655 idx_tmp_name = write_idx_file(NULL, written_list,
656 nr_written, sha1);
657 snprintf(tmpname, sizeof(tmpname), "%s-%s.pack",
658 base_name, sha1_to_hex(sha1));
659 if (adjust_perm(pack_tmp_name, mode))
660 die("unable to make temporary pack file readable: %s",
661 strerror(errno));
662 if (rename(pack_tmp_name, tmpname))
663 die("unable to rename temporary pack file: %s",
664 strerror(errno));
665 snprintf(tmpname, sizeof(tmpname), "%s-%s.idx",
666 base_name, sha1_to_hex(sha1));
667 if (adjust_perm(idx_tmp_name, mode))
668 die("unable to make temporary index file readable: %s",
669 strerror(errno));
670 if (rename(idx_tmp_name, tmpname))
671 die("unable to rename temporary index file: %s",
672 strerror(errno));
673 free(idx_tmp_name);
674 free(pack_tmp_name);
675 puts(sha1_to_hex(sha1));
676 }
677
678 /* mark written objects as written to previous pack */
679 for (j = 0; j < nr_written; j++) {
680 written_list[j]->offset = (off_t)-1;
681 }
682 nr_remaining -= nr_written;
683 } while (nr_remaining && i < nr_objects);
684
685 free(written_list);
686 stop_progress(&progress_state);
687 if (written != nr_result)
688 die("wrote %u objects while expecting %u", written, nr_result);
689 /*
690 * We have scanned through [0 ... i). Since we have written
691 * the correct number of objects, the remaining [i ... nr_objects)
692 * items must be either already written (due to out-of-order delta base)
693 * or a preferred base. Count those which are neither and complain if any.
694 */
695 for (j = 0; i < nr_objects; i++) {
696 struct object_entry *e = objects + i;
697 j += !e->idx.offset && !e->preferred_base;
698 }
699 if (j)
700 die("wrote %u objects as expected but %u unwritten", written, j);
701 }
702
703 static int locate_object_entry_hash(const unsigned char *sha1)
704 {
705 int i;
706 unsigned int ui;
707 memcpy(&ui, sha1, sizeof(unsigned int));
708 i = ui % object_ix_hashsz;
709 while (0 < object_ix[i]) {
710 if (!hashcmp(sha1, objects[object_ix[i] - 1].idx.sha1))
711 return i;
712 if (++i == object_ix_hashsz)
713 i = 0;
714 }
715 return -1 - i;
716 }
717
718 static struct object_entry *locate_object_entry(const unsigned char *sha1)
719 {
720 int i;
721
722 if (!object_ix_hashsz)
723 return NULL;
724
725 i = locate_object_entry_hash(sha1);
726 if (0 <= i)
727 return &objects[object_ix[i]-1];
728 return NULL;
729 }
730
731 static void rehash_objects(void)
732 {
733 uint32_t i;
734 struct object_entry *oe;
735
736 object_ix_hashsz = nr_objects * 3;
737 if (object_ix_hashsz < 1024)
738 object_ix_hashsz = 1024;
739 object_ix = xrealloc(object_ix, sizeof(int) * object_ix_hashsz);
740 memset(object_ix, 0, sizeof(int) * object_ix_hashsz);
741 for (i = 0, oe = objects; i < nr_objects; i++, oe++) {
742 int ix = locate_object_entry_hash(oe->idx.sha1);
743 if (0 <= ix)
744 continue;
745 ix = -1 - ix;
746 object_ix[ix] = i + 1;
747 }
748 }
749
750 static unsigned name_hash(const char *name)
751 {
752 unsigned char c;
753 unsigned hash = 0;
754
755 if (!name)
756 return 0;
757
758 /*
759 * This effectively just creates a sortable number from the
760 * last sixteen non-whitespace characters. Last characters
761 * count "most", so things that end in ".c" sort together.
762 */
763 while ((c = *name++) != 0) {
764 if (isspace(c))
765 continue;
766 hash = (hash >> 2) + (c << 24);
767 }
768 return hash;
769 }
770
771 static void setup_delta_attr_check(struct git_attr_check *check)
772 {
773 static struct git_attr *attr_delta;
774
775 if (!attr_delta)
776 attr_delta = git_attr("delta", 5);
777
778 check[0].attr = attr_delta;
779 }
780
781 static int no_try_delta(const char *path)
782 {
783 struct git_attr_check check[1];
784
785 setup_delta_attr_check(check);
786 if (git_checkattr(path, ARRAY_SIZE(check), check))
787 return 0;
788 if (ATTR_FALSE(check->value))
789 return 1;
790 return 0;
791 }
792
793 static int add_object_entry(const unsigned char *sha1, enum object_type type,
794 const char *name, int exclude)
795 {
796 struct object_entry *entry;
797 struct packed_git *p, *found_pack = NULL;
798 off_t found_offset = 0;
799 int ix;
800 unsigned hash = name_hash(name);
801
802 ix = nr_objects ? locate_object_entry_hash(sha1) : -1;
803 if (ix >= 0) {
804 if (exclude) {
805 entry = objects + object_ix[ix] - 1;
806 if (!entry->preferred_base)
807 nr_result--;
808 entry->preferred_base = 1;
809 }
810 return 0;
811 }
812
813 for (p = packed_git; p; p = p->next) {
814 off_t offset = find_pack_entry_one(sha1, p);
815 if (offset) {
816 if (!found_pack) {
817 found_offset = offset;
818 found_pack = p;
819 }
820 if (exclude)
821 break;
822 if (incremental)
823 return 0;
824 if (local && !p->pack_local)
825 return 0;
826 }
827 }
828
829 if (nr_objects >= nr_alloc) {
830 nr_alloc = (nr_alloc + 1024) * 3 / 2;
831 objects = xrealloc(objects, nr_alloc * sizeof(*entry));
832 }
833
834 entry = objects + nr_objects++;
835 memset(entry, 0, sizeof(*entry));
836 hashcpy(entry->idx.sha1, sha1);
837 entry->hash = hash;
838 if (type)
839 entry->type = type;
840 if (exclude)
841 entry->preferred_base = 1;
842 else
843 nr_result++;
844 if (found_pack) {
845 entry->in_pack = found_pack;
846 entry->in_pack_offset = found_offset;
847 }
848
849 if (object_ix_hashsz * 3 <= nr_objects * 4)
850 rehash_objects();
851 else
852 object_ix[-1 - ix] = nr_objects;
853
854 display_progress(progress_state, nr_objects);
855
856 if (name && no_try_delta(name))
857 entry->no_try_delta = 1;
858
859 return 1;
860 }
861
862 struct pbase_tree_cache {
863 unsigned char sha1[20];
864 int ref;
865 int temporary;
866 void *tree_data;
867 unsigned long tree_size;
868 };
869
870 static struct pbase_tree_cache *(pbase_tree_cache[256]);
871 static int pbase_tree_cache_ix(const unsigned char *sha1)
872 {
873 return sha1[0] % ARRAY_SIZE(pbase_tree_cache);
874 }
875 static int pbase_tree_cache_ix_incr(int ix)
876 {
877 return (ix+1) % ARRAY_SIZE(pbase_tree_cache);
878 }
879
880 static struct pbase_tree {
881 struct pbase_tree *next;
882 /* This is a phony "cache" entry; we are not
883 * going to evict it nor find it through _get()
884 * mechanism -- this is for the toplevel node that
885 * would almost always change with any commit.
886 */
887 struct pbase_tree_cache pcache;
888 } *pbase_tree;
889
890 static struct pbase_tree_cache *pbase_tree_get(const unsigned char *sha1)
891 {
892 struct pbase_tree_cache *ent, *nent;
893 void *data;
894 unsigned long size;
895 enum object_type type;
896 int neigh;
897 int my_ix = pbase_tree_cache_ix(sha1);
898 int available_ix = -1;
899
900 /* pbase-tree-cache acts as a limited hashtable.
901 * your object will be found at your index or within a few
902 * slots after that slot if it is cached.
903 */
904 for (neigh = 0; neigh < 8; neigh++) {
905 ent = pbase_tree_cache[my_ix];
906 if (ent && !hashcmp(ent->sha1, sha1)) {
907 ent->ref++;
908 return ent;
909 }
910 else if (((available_ix < 0) && (!ent || !ent->ref)) ||
911 ((0 <= available_ix) &&
912 (!ent && pbase_tree_cache[available_ix])))
913 available_ix = my_ix;
914 if (!ent)
915 break;
916 my_ix = pbase_tree_cache_ix_incr(my_ix);
917 }
918
919 /* Did not find one. Either we got a bogus request or
920 * we need to read and perhaps cache.
921 */
922 data = read_sha1_file(sha1, &type, &size);
923 if (!data)
924 return NULL;
925 if (type != OBJ_TREE) {
926 free(data);
927 return NULL;
928 }
929
930 /* We need to either cache or return a throwaway copy */
931
932 if (available_ix < 0)
933 ent = NULL;
934 else {
935 ent = pbase_tree_cache[available_ix];
936 my_ix = available_ix;
937 }
938
939 if (!ent) {
940 nent = xmalloc(sizeof(*nent));
941 nent->temporary = (available_ix < 0);
942 }
943 else {
944 /* evict and reuse */
945 free(ent->tree_data);
946 nent = ent;
947 }
948 hashcpy(nent->sha1, sha1);
949 nent->tree_data = data;
950 nent->tree_size = size;
951 nent->ref = 1;
952 if (!nent->temporary)
953 pbase_tree_cache[my_ix] = nent;
954 return nent;
955 }
956
957 static void pbase_tree_put(struct pbase_tree_cache *cache)
958 {
959 if (!cache->temporary) {
960 cache->ref--;
961 return;
962 }
963 free(cache->tree_data);
964 free(cache);
965 }
966
967 static int name_cmp_len(const char *name)
968 {
969 int i;
970 for (i = 0; name[i] && name[i] != '\n' && name[i] != '/'; i++)
971 ;
972 return i;
973 }
974
975 static void add_pbase_object(struct tree_desc *tree,
976 const char *name,
977 int cmplen,
978 const char *fullname)
979 {
980 struct name_entry entry;
981 int cmp;
982
983 while (tree_entry(tree,&entry)) {
984 if (S_ISGITLINK(entry.mode))
985 continue;
986 cmp = tree_entry_len(entry.path, entry.sha1) != cmplen ? 1 :
987 memcmp(name, entry.path, cmplen);
988 if (cmp > 0)
989 continue;
990 if (cmp < 0)
991 return;
992 if (name[cmplen] != '/') {
993 add_object_entry(entry.sha1,
994 object_type(entry.mode),
995 fullname, 1);
996 return;
997 }
998 if (S_ISDIR(entry.mode)) {
999 struct tree_desc sub;
1000 struct pbase_tree_cache *tree;
1001 const char *down = name+cmplen+1;
1002 int downlen = name_cmp_len(down);
1003
1004 tree = pbase_tree_get(entry.sha1);
1005 if (!tree)
1006 return;
1007 init_tree_desc(&sub, tree->tree_data, tree->tree_size);
1008
1009 add_pbase_object(&sub, down, downlen, fullname);
1010 pbase_tree_put(tree);
1011 }
1012 }
1013 }
1014
1015 static unsigned *done_pbase_paths;
1016 static int done_pbase_paths_num;
1017 static int done_pbase_paths_alloc;
1018 static int done_pbase_path_pos(unsigned hash)
1019 {
1020 int lo = 0;
1021 int hi = done_pbase_paths_num;
1022 while (lo < hi) {
1023 int mi = (hi + lo) / 2;
1024 if (done_pbase_paths[mi] == hash)
1025 return mi;
1026 if (done_pbase_paths[mi] < hash)
1027 hi = mi;
1028 else
1029 lo = mi + 1;
1030 }
1031 return -lo-1;
1032 }
1033
1034 static int check_pbase_path(unsigned hash)
1035 {
1036 int pos = (!done_pbase_paths) ? -1 : done_pbase_path_pos(hash);
1037 if (0 <= pos)
1038 return 1;
1039 pos = -pos - 1;
1040 if (done_pbase_paths_alloc <= done_pbase_paths_num) {
1041 done_pbase_paths_alloc = alloc_nr(done_pbase_paths_alloc);
1042 done_pbase_paths = xrealloc(done_pbase_paths,
1043 done_pbase_paths_alloc *
1044 sizeof(unsigned));
1045 }
1046 done_pbase_paths_num++;
1047 if (pos < done_pbase_paths_num)
1048 memmove(done_pbase_paths + pos + 1,
1049 done_pbase_paths + pos,
1050 (done_pbase_paths_num - pos - 1) * sizeof(unsigned));
1051 done_pbase_paths[pos] = hash;
1052 return 0;
1053 }
1054
1055 static void add_preferred_base_object(const char *name)
1056 {
1057 struct pbase_tree *it;
1058 int cmplen;
1059 unsigned hash = name_hash(name);
1060
1061 if (!num_preferred_base || check_pbase_path(hash))
1062 return;
1063
1064 cmplen = name_cmp_len(name);
1065 for (it = pbase_tree; it; it = it->next) {
1066 if (cmplen == 0) {
1067 add_object_entry(it->pcache.sha1, OBJ_TREE, NULL, 1);
1068 }
1069 else {
1070 struct tree_desc tree;
1071 init_tree_desc(&tree, it->pcache.tree_data, it->pcache.tree_size);
1072 add_pbase_object(&tree, name, cmplen, name);
1073 }
1074 }
1075 }
1076
1077 static void add_preferred_base(unsigned char *sha1)
1078 {
1079 struct pbase_tree *it;
1080 void *data;
1081 unsigned long size;
1082 unsigned char tree_sha1[20];
1083
1084 if (window <= num_preferred_base++)
1085 return;
1086
1087 data = read_object_with_reference(sha1, tree_type, &size, tree_sha1);
1088 if (!data)
1089 return;
1090
1091 for (it = pbase_tree; it; it = it->next) {
1092 if (!hashcmp(it->pcache.sha1, tree_sha1)) {
1093 free(data);
1094 return;
1095 }
1096 }
1097
1098 it = xcalloc(1, sizeof(*it));
1099 it->next = pbase_tree;
1100 pbase_tree = it;
1101
1102 hashcpy(it->pcache.sha1, tree_sha1);
1103 it->pcache.tree_data = data;
1104 it->pcache.tree_size = size;
1105 }
1106
1107 static void check_object(struct object_entry *entry)
1108 {
1109 if (entry->in_pack) {
1110 struct packed_git *p = entry->in_pack;
1111 struct pack_window *w_curs = NULL;
1112 const unsigned char *base_ref = NULL;
1113 struct object_entry *base_entry;
1114 unsigned long used, used_0;
1115 unsigned int avail;
1116 off_t ofs;
1117 unsigned char *buf, c;
1118
1119 buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail);
1120
1121 /*
1122 * We want in_pack_type even if we do not reuse delta
1123 * since non-delta representations could still be reused.
1124 */
1125 used = unpack_object_header_gently(buf, avail,
1126 &entry->in_pack_type,
1127 &entry->size);
1128
1129 /*
1130 * Determine if this is a delta and if so whether we can
1131 * reuse it or not. Otherwise let's find out as cheaply as
1132 * possible what the actual type and size for this object is.
1133 */
1134 switch (entry->in_pack_type) {
1135 default:
1136 /* Not a delta hence we've already got all we need. */
1137 entry->type = entry->in_pack_type;
1138 entry->in_pack_header_size = used;
1139 unuse_pack(&w_curs);
1140 return;
1141 case OBJ_REF_DELTA:
1142 if (!no_reuse_delta && !entry->preferred_base)
1143 base_ref = use_pack(p, &w_curs,
1144 entry->in_pack_offset + used, NULL);
1145 entry->in_pack_header_size = used + 20;
1146 break;
1147 case OBJ_OFS_DELTA:
1148 buf = use_pack(p, &w_curs,
1149 entry->in_pack_offset + used, NULL);
1150 used_0 = 0;
1151 c = buf[used_0++];
1152 ofs = c & 127;
1153 while (c & 128) {
1154 ofs += 1;
1155 if (!ofs || MSB(ofs, 7))
1156 die("delta base offset overflow in pack for %s",
1157 sha1_to_hex(entry->idx.sha1));
1158 c = buf[used_0++];
1159 ofs = (ofs << 7) + (c & 127);
1160 }
1161 if (ofs >= entry->in_pack_offset)
1162 die("delta base offset out of bound for %s",
1163 sha1_to_hex(entry->idx.sha1));
1164 ofs = entry->in_pack_offset - ofs;
1165 if (!no_reuse_delta && !entry->preferred_base)
1166 base_ref = find_packed_object_name(p, ofs);
1167 entry->in_pack_header_size = used + used_0;
1168 break;
1169 }
1170
1171 if (base_ref && (base_entry = locate_object_entry(base_ref))) {
1172 /*
1173 * If base_ref was set above that means we wish to
1174 * reuse delta data, and we even found that base
1175 * in the list of objects we want to pack. Goodie!
1176 *
1177 * Depth value does not matter - find_deltas() will
1178 * never consider reused delta as the base object to
1179 * deltify other objects against, in order to avoid
1180 * circular deltas.
1181 */
1182 entry->type = entry->in_pack_type;
1183 entry->delta = base_entry;
1184 entry->delta_sibling = base_entry->delta_child;
1185 base_entry->delta_child = entry;
1186 unuse_pack(&w_curs);
1187 return;
1188 }
1189
1190 if (entry->type) {
1191 /*
1192 * This must be a delta and we already know what the
1193 * final object type is. Let's extract the actual
1194 * object size from the delta header.
1195 */
1196 entry->size = get_size_from_delta(p, &w_curs,
1197 entry->in_pack_offset + entry->in_pack_header_size);
1198 unuse_pack(&w_curs);
1199 return;
1200 }
1201
1202 /*
1203 * No choice but to fall back to the recursive delta walk
1204 * with sha1_object_info() to find about the object type
1205 * at this point...
1206 */
1207 unuse_pack(&w_curs);
1208 }
1209
1210 entry->type = sha1_object_info(entry->idx.sha1, &entry->size);
1211 if (entry->type < 0)
1212 die("unable to get type of object %s",
1213 sha1_to_hex(entry->idx.sha1));
1214 }
1215
1216 static int pack_offset_sort(const void *_a, const void *_b)
1217 {
1218 const struct object_entry *a = *(struct object_entry **)_a;
1219 const struct object_entry *b = *(struct object_entry **)_b;
1220
1221 /* avoid filesystem trashing with loose objects */
1222 if (!a->in_pack && !b->in_pack)
1223 return hashcmp(a->idx.sha1, b->idx.sha1);
1224
1225 if (a->in_pack < b->in_pack)
1226 return -1;
1227 if (a->in_pack > b->in_pack)
1228 return 1;
1229 return a->in_pack_offset < b->in_pack_offset ? -1 :
1230 (a->in_pack_offset > b->in_pack_offset);
1231 }
1232
1233 static void get_object_details(void)
1234 {
1235 uint32_t i;
1236 struct object_entry **sorted_by_offset;
1237
1238 sorted_by_offset = xcalloc(nr_objects, sizeof(struct object_entry *));
1239 for (i = 0; i < nr_objects; i++)
1240 sorted_by_offset[i] = objects + i;
1241 qsort(sorted_by_offset, nr_objects, sizeof(*sorted_by_offset), pack_offset_sort);
1242
1243 prepare_pack_ix();
1244 for (i = 0; i < nr_objects; i++)
1245 check_object(sorted_by_offset[i]);
1246 free(sorted_by_offset);
1247 }
1248
1249 /*
1250 * We search for deltas in a list sorted by type, by filename hash, and then
1251 * by size, so that we see progressively smaller and smaller files.
1252 * That's because we prefer deltas to be from the bigger file
1253 * to the smaller -- deletes are potentially cheaper, but perhaps
1254 * more importantly, the bigger file is likely the more recent
1255 * one. The deepest deltas are therefore the oldest objects which are
1256 * less susceptible to be accessed often.
1257 */
1258 static int type_size_sort(const void *_a, const void *_b)
1259 {
1260 const struct object_entry *a = *(struct object_entry **)_a;
1261 const struct object_entry *b = *(struct object_entry **)_b;
1262
1263 if (a->type > b->type)
1264 return -1;
1265 if (a->type < b->type)
1266 return 1;
1267 if (a->hash > b->hash)
1268 return -1;
1269 if (a->hash < b->hash)
1270 return 1;
1271 if (a->preferred_base > b->preferred_base)
1272 return -1;
1273 if (a->preferred_base < b->preferred_base)
1274 return 1;
1275 if (a->size > b->size)
1276 return -1;
1277 if (a->size < b->size)
1278 return 1;
1279 return a < b ? -1 : (a > b); /* newest first */
1280 }
1281
1282 struct unpacked {
1283 struct object_entry *entry;
1284 void *data;
1285 struct delta_index *index;
1286 unsigned depth;
1287 };
1288
1289 static int delta_cacheable(unsigned long src_size, unsigned long trg_size,
1290 unsigned long delta_size)
1291 {
1292 if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size)
1293 return 0;
1294
1295 if (delta_size < cache_max_small_delta_size)
1296 return 1;
1297
1298 /* cache delta, if objects are large enough compared to delta size */
1299 if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10))
1300 return 1;
1301
1302 return 0;
1303 }
1304
1305 #ifdef THREADED_DELTA_SEARCH
1306
1307 static pthread_mutex_t read_mutex = PTHREAD_MUTEX_INITIALIZER;
1308 #define read_lock() pthread_mutex_lock(&read_mutex)
1309 #define read_unlock() pthread_mutex_unlock(&read_mutex)
1310
1311 static pthread_mutex_t cache_mutex = PTHREAD_MUTEX_INITIALIZER;
1312 #define cache_lock() pthread_mutex_lock(&cache_mutex)
1313 #define cache_unlock() pthread_mutex_unlock(&cache_mutex)
1314
1315 static pthread_mutex_t progress_mutex = PTHREAD_MUTEX_INITIALIZER;
1316 #define progress_lock() pthread_mutex_lock(&progress_mutex)
1317 #define progress_unlock() pthread_mutex_unlock(&progress_mutex)
1318
1319 #else
1320
1321 #define read_lock() (void)0
1322 #define read_unlock() (void)0
1323 #define cache_lock() (void)0
1324 #define cache_unlock() (void)0
1325 #define progress_lock() (void)0
1326 #define progress_unlock() (void)0
1327
1328 #endif
1329
1330 static int try_delta(struct unpacked *trg, struct unpacked *src,
1331 unsigned max_depth, unsigned long *mem_usage)
1332 {
1333 struct object_entry *trg_entry = trg->entry;
1334 struct object_entry *src_entry = src->entry;
1335 unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
1336 unsigned ref_depth;
1337 enum object_type type;
1338 void *delta_buf;
1339
1340 /* Don't bother doing diffs between different types */
1341 if (trg_entry->type != src_entry->type)
1342 return -1;
1343
1344 /*
1345 * We do not bother to try a delta that we discarded
1346 * on an earlier try, but only when reusing delta data.
1347 */
1348 if (!no_reuse_delta && trg_entry->in_pack &&
1349 trg_entry->in_pack == src_entry->in_pack &&
1350 trg_entry->in_pack_type != OBJ_REF_DELTA &&
1351 trg_entry->in_pack_type != OBJ_OFS_DELTA)
1352 return 0;
1353
1354 /* Let's not bust the allowed depth. */
1355 if (src->depth >= max_depth)
1356 return 0;
1357
1358 /* Now some size filtering heuristics. */
1359 trg_size = trg_entry->size;
1360 if (!trg_entry->delta) {
1361 max_size = trg_size/2 - 20;
1362 ref_depth = 1;
1363 } else {
1364 max_size = trg_entry->delta_size;
1365 ref_depth = trg->depth;
1366 }
1367 max_size = max_size * (max_depth - src->depth) /
1368 (max_depth - ref_depth + 1);
1369 if (max_size == 0)
1370 return 0;
1371 src_size = src_entry->size;
1372 sizediff = src_size < trg_size ? trg_size - src_size : 0;
1373 if (sizediff >= max_size)
1374 return 0;
1375 if (trg_size < src_size / 32)
1376 return 0;
1377
1378 /* Load data if not already done */
1379 if (!trg->data) {
1380 read_lock();
1381 trg->data = read_sha1_file(trg_entry->idx.sha1, &type, &sz);
1382 read_unlock();
1383 if (!trg->data)
1384 die("object %s cannot be read",
1385 sha1_to_hex(trg_entry->idx.sha1));
1386 if (sz != trg_size)
1387 die("object %s inconsistent object length (%lu vs %lu)",
1388 sha1_to_hex(trg_entry->idx.sha1), sz, trg_size);
1389 *mem_usage += sz;
1390 }
1391 if (!src->data) {
1392 read_lock();
1393 src->data = read_sha1_file(src_entry->idx.sha1, &type, &sz);
1394 read_unlock();
1395 if (!src->data)
1396 die("object %s cannot be read",
1397 sha1_to_hex(src_entry->idx.sha1));
1398 if (sz != src_size)
1399 die("object %s inconsistent object length (%lu vs %lu)",
1400 sha1_to_hex(src_entry->idx.sha1), sz, src_size);
1401 *mem_usage += sz;
1402 }
1403 if (!src->index) {
1404 src->index = create_delta_index(src->data, src_size);
1405 if (!src->index) {
1406 static int warned = 0;
1407 if (!warned++)
1408 warning("suboptimal pack - out of memory");
1409 return 0;
1410 }
1411 *mem_usage += sizeof_delta_index(src->index);
1412 }
1413
1414 delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
1415 if (!delta_buf)
1416 return 0;
1417
1418 if (trg_entry->delta) {
1419 /* Prefer only shallower same-sized deltas. */
1420 if (delta_size == trg_entry->delta_size &&
1421 src->depth + 1 >= trg->depth) {
1422 free(delta_buf);
1423 return 0;
1424 }
1425 }
1426
1427 /*
1428 * Handle memory allocation outside of the cache
1429 * accounting lock. Compiler will optimize the strangeness
1430 * away when THREADED_DELTA_SEARCH is not defined.
1431 */
1432 if (trg_entry->delta_data)
1433 free(trg_entry->delta_data);
1434 cache_lock();
1435 if (trg_entry->delta_data) {
1436 delta_cache_size -= trg_entry->delta_size;
1437 trg_entry->delta_data = NULL;
1438 }
1439 if (delta_cacheable(src_size, trg_size, delta_size)) {
1440 delta_cache_size += delta_size;
1441 cache_unlock();
1442 trg_entry->delta_data = xrealloc(delta_buf, delta_size);
1443 } else {
1444 cache_unlock();
1445 free(delta_buf);
1446 }
1447
1448 trg_entry->delta = src_entry;
1449 trg_entry->delta_size = delta_size;
1450 trg->depth = src->depth + 1;
1451
1452 return 1;
1453 }
1454
1455 static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
1456 {
1457 struct object_entry *child = me->delta_child;
1458 unsigned int m = n;
1459 while (child) {
1460 unsigned int c = check_delta_limit(child, n + 1);
1461 if (m < c)
1462 m = c;
1463 child = child->delta_sibling;
1464 }
1465 return m;
1466 }
1467
1468 static unsigned long free_unpacked(struct unpacked *n)
1469 {
1470 unsigned long freed_mem = sizeof_delta_index(n->index);
1471 free_delta_index(n->index);
1472 n->index = NULL;
1473 if (n->data) {
1474 freed_mem += n->entry->size;
1475 free(n->data);
1476 n->data = NULL;
1477 }
1478 n->entry = NULL;
1479 n->depth = 0;
1480 return freed_mem;
1481 }
1482
1483 static void find_deltas(struct object_entry **list, unsigned *list_size,
1484 int window, int depth, unsigned *processed)
1485 {
1486 uint32_t i, idx = 0, count = 0;
1487 unsigned int array_size = window * sizeof(struct unpacked);
1488 struct unpacked *array;
1489 unsigned long mem_usage = 0;
1490
1491 array = xmalloc(array_size);
1492 memset(array, 0, array_size);
1493
1494 for (;;) {
1495 struct object_entry *entry = *list++;
1496 struct unpacked *n = array + idx;
1497 int j, max_depth, best_base = -1;
1498
1499 progress_lock();
1500 if (!*list_size) {
1501 progress_unlock();
1502 break;
1503 }
1504 (*list_size)--;
1505 if (!entry->preferred_base) {
1506 (*processed)++;
1507 display_progress(progress_state, *processed);
1508 }
1509 progress_unlock();
1510
1511 mem_usage -= free_unpacked(n);
1512 n->entry = entry;
1513
1514 while (window_memory_limit &&
1515 mem_usage > window_memory_limit &&
1516 count > 1) {
1517 uint32_t tail = (idx + window - count) % window;
1518 mem_usage -= free_unpacked(array + tail);
1519 count--;
1520 }
1521
1522 /* We do not compute delta to *create* objects we are not
1523 * going to pack.
1524 */
1525 if (entry->preferred_base)
1526 goto next;
1527
1528 /*
1529 * If the current object is at pack edge, take the depth the
1530 * objects that depend on the current object into account
1531 * otherwise they would become too deep.
1532 */
1533 max_depth = depth;
1534 if (entry->delta_child) {
1535 max_depth -= check_delta_limit(entry, 0);
1536 if (max_depth <= 0)
1537 goto next;
1538 }
1539
1540 j = window;
1541 while (--j > 0) {
1542 int ret;
1543 uint32_t other_idx = idx + j;
1544 struct unpacked *m;
1545 if (other_idx >= window)
1546 other_idx -= window;
1547 m = array + other_idx;
1548 if (!m->entry)
1549 break;
1550 ret = try_delta(n, m, max_depth, &mem_usage);
1551 if (ret < 0)
1552 break;
1553 else if (ret > 0)
1554 best_base = other_idx;
1555 }
1556
1557 /* if we made n a delta, and if n is already at max
1558 * depth, leaving it in the window is pointless. we
1559 * should evict it first.
1560 */
1561 if (entry->delta && depth <= n->depth)
1562 continue;
1563
1564 /*
1565 * Move the best delta base up in the window, after the
1566 * currently deltified object, to keep it longer. It will
1567 * be the first base object to be attempted next.
1568 */
1569 if (entry->delta) {
1570 struct unpacked swap = array[best_base];
1571 int dist = (window + idx - best_base) % window;
1572 int dst = best_base;
1573 while (dist--) {
1574 int src = (dst + 1) % window;
1575 array[dst] = array[src];
1576 dst = src;
1577 }
1578 array[dst] = swap;
1579 }
1580
1581 next:
1582 idx++;
1583 if (count + 1 < window)
1584 count++;
1585 if (idx >= window)
1586 idx = 0;
1587 }
1588
1589 for (i = 0; i < window; ++i) {
1590 free_delta_index(array[i].index);
1591 free(array[i].data);
1592 }
1593 free(array);
1594 }
1595
1596 #ifdef THREADED_DELTA_SEARCH
1597
1598 /*
1599 * The main thread waits on the condition that (at least) one of the workers
1600 * has stopped working (which is indicated in the .working member of
1601 * struct thread_params).
1602 * When a work thread has completed its work, it sets .working to 0 and
1603 * signals the main thread and waits on the condition that .data_ready
1604 * becomes 1.
1605 */
1606
1607 struct thread_params {
1608 pthread_t thread;
1609 struct object_entry **list;
1610 unsigned list_size;
1611 unsigned remaining;
1612 int window;
1613 int depth;
1614 int working;
1615 int data_ready;
1616 pthread_mutex_t mutex;
1617 pthread_cond_t cond;
1618 unsigned *processed;
1619 };
1620
1621 static pthread_cond_t progress_cond = PTHREAD_COND_INITIALIZER;
1622
1623 static void *threaded_find_deltas(void *arg)
1624 {
1625 struct thread_params *me = arg;
1626
1627 while (me->remaining) {
1628 find_deltas(me->list, &me->remaining,
1629 me->window, me->depth, me->processed);
1630
1631 progress_lock();
1632 me->working = 0;
1633 pthread_cond_signal(&progress_cond);
1634 progress_unlock();
1635
1636 /*
1637 * We must not set ->data_ready before we wait on the
1638 * condition because the main thread may have set it to 1
1639 * before we get here. In order to be sure that new
1640 * work is available if we see 1 in ->data_ready, it
1641 * was initialized to 0 before this thread was spawned
1642 * and we reset it to 0 right away.
1643 */
1644 pthread_mutex_lock(&me->mutex);
1645 while (!me->data_ready)
1646 pthread_cond_wait(&me->cond, &me->mutex);
1647 me->data_ready = 0;
1648 pthread_mutex_unlock(&me->mutex);
1649 }
1650 /* leave ->working 1 so that this doesn't get more work assigned */
1651 return NULL;
1652 }
1653
1654 static void ll_find_deltas(struct object_entry **list, unsigned list_size,
1655 int window, int depth, unsigned *processed)
1656 {
1657 struct thread_params p[delta_search_threads];
1658 int i, ret, active_threads = 0;
1659
1660 if (delta_search_threads <= 1) {
1661 find_deltas(list, &list_size, window, depth, processed);
1662 return;
1663 }
1664
1665 /* Partition the work amongst work threads. */
1666 for (i = 0; i < delta_search_threads; i++) {
1667 unsigned sub_size = list_size / (delta_search_threads - i);
1668
1669 p[i].window = window;
1670 p[i].depth = depth;
1671 p[i].processed = processed;
1672 p[i].working = 1;
1673 p[i].data_ready = 0;
1674
1675 /* try to split chunks on "path" boundaries */
1676 while (sub_size && sub_size < list_size &&
1677 list[sub_size]->hash &&
1678 list[sub_size]->hash == list[sub_size-1]->hash)
1679 sub_size++;
1680
1681 p[i].list = list;
1682 p[i].list_size = sub_size;
1683 p[i].remaining = sub_size;
1684
1685 list += sub_size;
1686 list_size -= sub_size;
1687 }
1688
1689 /* Start work threads. */
1690 for (i = 0; i < delta_search_threads; i++) {
1691 if (!p[i].list_size)
1692 continue;
1693 pthread_mutex_init(&p[i].mutex, NULL);
1694 pthread_cond_init(&p[i].cond, NULL);
1695 ret = pthread_create(&p[i].thread, NULL,
1696 threaded_find_deltas, &p[i]);
1697 if (ret)
1698 die("unable to create thread: %s", strerror(ret));
1699 active_threads++;
1700 }
1701
1702 /*
1703 * Now let's wait for work completion. Each time a thread is done
1704 * with its work, we steal half of the remaining work from the
1705 * thread with the largest number of unprocessed objects and give
1706 * it to that newly idle thread. This ensure good load balancing
1707 * until the remaining object list segments are simply too short
1708 * to be worth splitting anymore.
1709 */
1710 while (active_threads) {
1711 struct thread_params *target = NULL;
1712 struct thread_params *victim = NULL;
1713 unsigned sub_size = 0;
1714
1715 progress_lock();
1716 for (;;) {
1717 for (i = 0; !target && i < delta_search_threads; i++)
1718 if (!p[i].working)
1719 target = &p[i];
1720 if (target)
1721 break;
1722 pthread_cond_wait(&progress_cond, &progress_mutex);
1723 }
1724
1725 for (i = 0; i < delta_search_threads; i++)
1726 if (p[i].remaining > 2*window &&
1727 (!victim || victim->remaining < p[i].remaining))
1728 victim = &p[i];
1729 if (victim) {
1730 sub_size = victim->remaining / 2;
1731 list = victim->list + victim->list_size - sub_size;
1732 while (sub_size && list[0]->hash &&
1733 list[0]->hash == list[-1]->hash) {
1734 list++;
1735 sub_size--;
1736 }
1737 if (!sub_size) {
1738 /*
1739 * It is possible for some "paths" to have
1740 * so many objects that no hash boundary
1741 * might be found. Let's just steal the
1742 * exact half in that case.
1743 */
1744 sub_size = victim->remaining / 2;
1745 list -= sub_size;
1746 }
1747 target->list = list;
1748 victim->list_size -= sub_size;
1749 victim->remaining -= sub_size;
1750 }
1751 target->list_size = sub_size;
1752 target->remaining = sub_size;
1753 target->working = 1;
1754 progress_unlock();
1755
1756 pthread_mutex_lock(&target->mutex);
1757 target->data_ready = 1;
1758 pthread_cond_signal(&target->cond);
1759 pthread_mutex_unlock(&target->mutex);
1760
1761 if (!sub_size) {
1762 pthread_join(target->thread, NULL);
1763 pthread_cond_destroy(&target->cond);
1764 pthread_mutex_destroy(&target->mutex);
1765 active_threads--;
1766 }
1767 }
1768 }
1769
1770 #else
1771 #define ll_find_deltas(l, s, w, d, p) find_deltas(l, &s, w, d, p)
1772 #endif
1773
1774 static void prepare_pack(int window, int depth)
1775 {
1776 struct object_entry **delta_list;
1777 uint32_t i, n, nr_deltas;
1778
1779 get_object_details();
1780
1781 if (!nr_objects || !window || !depth)
1782 return;
1783
1784 delta_list = xmalloc(nr_objects * sizeof(*delta_list));
1785 nr_deltas = n = 0;
1786
1787 for (i = 0; i < nr_objects; i++) {
1788 struct object_entry *entry = objects + i;
1789
1790 if (entry->delta)
1791 /* This happens if we decided to reuse existing
1792 * delta from a pack. "!no_reuse_delta &&" is implied.
1793 */
1794 continue;
1795
1796 if (entry->size < 50)
1797 continue;
1798
1799 if (entry->no_try_delta)
1800 continue;
1801
1802 if (!entry->preferred_base)
1803 nr_deltas++;
1804
1805 delta_list[n++] = entry;
1806 }
1807
1808 if (nr_deltas && n > 1) {
1809 unsigned nr_done = 0;
1810 if (progress)
1811 progress_state = start_progress("Compressing objects",
1812 nr_deltas);
1813 qsort(delta_list, n, sizeof(*delta_list), type_size_sort);
1814 ll_find_deltas(delta_list, n, window+1, depth, &nr_done);
1815 stop_progress(&progress_state);
1816 if (nr_done != nr_deltas)
1817 die("inconsistency with delta count");
1818 }
1819 free(delta_list);
1820 }
1821
1822 static int git_pack_config(const char *k, const char *v)
1823 {
1824 if(!strcmp(k, "pack.window")) {
1825 window = git_config_int(k, v);
1826 return 0;
1827 }
1828 if (!strcmp(k, "pack.windowmemory")) {
1829 window_memory_limit = git_config_ulong(k, v);
1830 return 0;
1831 }
1832 if (!strcmp(k, "pack.depth")) {
1833 depth = git_config_int(k, v);
1834 return 0;
1835 }
1836 if (!strcmp(k, "pack.compression")) {
1837 int level = git_config_int(k, v);
1838 if (level == -1)
1839 level = Z_DEFAULT_COMPRESSION;
1840 else if (level < 0 || level > Z_BEST_COMPRESSION)
1841 die("bad pack compression level %d", level);
1842 pack_compression_level = level;
1843 pack_compression_seen = 1;
1844 return 0;
1845 }
1846 if (!strcmp(k, "pack.deltacachesize")) {
1847 max_delta_cache_size = git_config_int(k, v);
1848 return 0;
1849 }
1850 if (!strcmp(k, "pack.deltacachelimit")) {
1851 cache_max_small_delta_size = git_config_int(k, v);
1852 return 0;
1853 }
1854 if (!strcmp(k, "pack.threads")) {
1855 delta_search_threads = git_config_int(k, v);
1856 if (delta_search_threads < 0)
1857 die("invalid number of threads specified (%d)",
1858 delta_search_threads);
1859 #ifndef THREADED_DELTA_SEARCH
1860 if (delta_search_threads != 1)
1861 warning("no threads support, ignoring %s", k);
1862 #endif
1863 return 0;
1864 }
1865 if (!strcmp(k, "pack.indexversion")) {
1866 pack_idx_default_version = git_config_int(k, v);
1867 if (pack_idx_default_version > 2)
1868 die("bad pack.indexversion=%d", pack_idx_default_version);
1869 return 0;
1870 }
1871 if (!strcmp(k, "pack.packsizelimit")) {
1872 pack_size_limit_cfg = git_config_ulong(k, v);
1873 return 0;
1874 }
1875 return git_default_config(k, v);
1876 }
1877
1878 static void read_object_list_from_stdin(void)
1879 {
1880 char line[40 + 1 + PATH_MAX + 2];
1881 unsigned char sha1[20];
1882
1883 for (;;) {
1884 if (!fgets(line, sizeof(line), stdin)) {
1885 if (feof(stdin))
1886 break;
1887 if (!ferror(stdin))
1888 die("fgets returned NULL, not EOF, not error!");
1889 if (errno != EINTR)
1890 die("fgets: %s", strerror(errno));
1891 clearerr(stdin);
1892 continue;
1893 }
1894 if (line[0] == '-') {
1895 if (get_sha1_hex(line+1, sha1))
1896 die("expected edge sha1, got garbage:\n %s",
1897 line);
1898 add_preferred_base(sha1);
1899 continue;
1900 }
1901 if (get_sha1_hex(line, sha1))
1902 die("expected sha1, got garbage:\n %s", line);
1903
1904 add_preferred_base_object(line+41);
1905 add_object_entry(sha1, 0, line+41, 0);
1906 }
1907 }
1908
1909 #define OBJECT_ADDED (1u<<20)
1910
1911 static void show_commit(struct commit *commit)
1912 {
1913 add_object_entry(commit->object.sha1, OBJ_COMMIT, NULL, 0);
1914 commit->object.flags |= OBJECT_ADDED;
1915 }
1916
1917 static void show_object(struct object_array_entry *p)
1918 {
1919 add_preferred_base_object(p->name);
1920 add_object_entry(p->item->sha1, p->item->type, p->name, 0);
1921 p->item->flags |= OBJECT_ADDED;
1922 }
1923
1924 static void show_edge(struct commit *commit)
1925 {
1926 add_preferred_base(commit->object.sha1);
1927 }
1928
1929 struct in_pack_object {
1930 off_t offset;
1931 struct object *object;
1932 };
1933
1934 struct in_pack {
1935 int alloc;
1936 int nr;
1937 struct in_pack_object *array;
1938 };
1939
1940 static void mark_in_pack_object(struct object *object, struct packed_git *p, struct in_pack *in_pack)
1941 {
1942 in_pack->array[in_pack->nr].offset = find_pack_entry_one(object->sha1, p);
1943 in_pack->array[in_pack->nr].object = object;
1944 in_pack->nr++;
1945 }
1946
1947 /*
1948 * Compare the objects in the offset order, in order to emulate the
1949 * "git-rev-list --objects" output that produced the pack originally.
1950 */
1951 static int ofscmp(const void *a_, const void *b_)
1952 {
1953 struct in_pack_object *a = (struct in_pack_object *)a_;
1954 struct in_pack_object *b = (struct in_pack_object *)b_;
1955
1956 if (a->offset < b->offset)
1957 return -1;
1958 else if (a->offset > b->offset)
1959 return 1;
1960 else
1961 return hashcmp(a->object->sha1, b->object->sha1);
1962 }
1963
1964 static void add_objects_in_unpacked_packs(struct rev_info *revs)
1965 {
1966 struct packed_git *p;
1967 struct in_pack in_pack;
1968 uint32_t i;
1969
1970 memset(&in_pack, 0, sizeof(in_pack));
1971
1972 for (p = packed_git; p; p = p->next) {
1973 const unsigned char *sha1;
1974 struct object *o;
1975
1976 for (i = 0; i < revs->num_ignore_packed; i++) {
1977 if (matches_pack_name(p, revs->ignore_packed[i]))
1978 break;
1979 }
1980 if (revs->num_ignore_packed <= i)
1981 continue;
1982 if (open_pack_index(p))
1983 die("cannot open pack index");
1984
1985 ALLOC_GROW(in_pack.array,
1986 in_pack.nr + p->num_objects,
1987 in_pack.alloc);
1988
1989 for (i = 0; i < p->num_objects; i++) {
1990 sha1 = nth_packed_object_sha1(p, i);
1991 o = lookup_unknown_object(sha1);
1992 if (!(o->flags & OBJECT_ADDED))
1993 mark_in_pack_object(o, p, &in_pack);
1994 o->flags |= OBJECT_ADDED;
1995 }
1996 }
1997
1998 if (in_pack.nr) {
1999 qsort(in_pack.array, in_pack.nr, sizeof(in_pack.array[0]),
2000 ofscmp);
2001 for (i = 0; i < in_pack.nr; i++) {
2002 struct object *o = in_pack.array[i].object;
2003 add_object_entry(o->sha1, o->type, "", 0);
2004 }
2005 }
2006 free(in_pack.array);
2007 }
2008
2009 static void get_object_list(int ac, const char **av)
2010 {
2011 struct rev_info revs;
2012 char line[1000];
2013 int flags = 0;
2014
2015 init_revisions(&revs, NULL);
2016 save_commit_buffer = 0;
2017 track_object_refs = 0;
2018 setup_revisions(ac, av, &revs, NULL);
2019
2020 while (fgets(line, sizeof(line), stdin) != NULL) {
2021 int len = strlen(line);
2022 if (len && line[len - 1] == '\n')
2023 line[--len] = 0;
2024 if (!len)
2025 break;
2026 if (*line == '-') {
2027 if (!strcmp(line, "--not")) {
2028 flags ^= UNINTERESTING;
2029 continue;
2030 }
2031 die("not a rev '%s'", line);
2032 }
2033 if (handle_revision_arg(line, &revs, flags, 1))
2034 die("bad revision '%s'", line);
2035 }
2036
2037 if (prepare_revision_walk(&revs))
2038 die("revision walk setup failed");
2039 mark_edges_uninteresting(revs.commits, &revs, show_edge);
2040 traverse_commit_list(&revs, show_commit, show_object);
2041
2042 if (keep_unreachable)
2043 add_objects_in_unpacked_packs(&revs);
2044 }
2045
2046 static int adjust_perm(const char *path, mode_t mode)
2047 {
2048 if (chmod(path, mode))
2049 return -1;
2050 return adjust_shared_perm(path);
2051 }
2052
2053 int cmd_pack_objects(int argc, const char **argv, const char *prefix)
2054 {
2055 int use_internal_rev_list = 0;
2056 int thin = 0;
2057 uint32_t i;
2058 const char **rp_av;
2059 int rp_ac_alloc = 64;
2060 int rp_ac;
2061
2062 rp_av = xcalloc(rp_ac_alloc, sizeof(*rp_av));
2063
2064 rp_av[0] = "pack-objects";
2065 rp_av[1] = "--objects"; /* --thin will make it --objects-edge */
2066 rp_ac = 2;
2067
2068 git_config(git_pack_config);
2069 if (!pack_compression_seen && core_compression_seen)
2070 pack_compression_level = core_compression_level;
2071
2072 progress = isatty(2);
2073 for (i = 1; i < argc; i++) {
2074 const char *arg = argv[i];
2075
2076 if (*arg != '-')
2077 break;
2078
2079 if (!strcmp("--non-empty", arg)) {
2080 non_empty = 1;
2081 continue;
2082 }
2083 if (!strcmp("--local", arg)) {
2084 local = 1;
2085 continue;
2086 }
2087 if (!strcmp("--incremental", arg)) {
2088 incremental = 1;
2089 continue;
2090 }
2091 if (!prefixcmp(arg, "--compression=")) {
2092 char *end;
2093 int level = strtoul(arg+14, &end, 0);
2094 if (!arg[14] || *end)
2095 usage(pack_usage);
2096 if (level == -1)
2097 level = Z_DEFAULT_COMPRESSION;
2098 else if (level < 0 || level > Z_BEST_COMPRESSION)
2099 die("bad pack compression level %d", level);
2100 pack_compression_level = level;
2101 continue;
2102 }
2103 if (!prefixcmp(arg, "--max-pack-size=")) {
2104 char *end;
2105 pack_size_limit_cfg = 0;
2106 pack_size_limit = strtoul(arg+16, &end, 0) * 1024 * 1024;
2107 if (!arg[16] || *end)
2108 usage(pack_usage);
2109 continue;
2110 }
2111 if (!prefixcmp(arg, "--window=")) {
2112 char *end;
2113 window = strtoul(arg+9, &end, 0);
2114 if (!arg[9] || *end)
2115 usage(pack_usage);
2116 continue;
2117 }
2118 if (!prefixcmp(arg, "--window-memory=")) {
2119 if (!git_parse_ulong(arg+16, &window_memory_limit))
2120 usage(pack_usage);
2121 continue;
2122 }
2123 if (!prefixcmp(arg, "--threads=")) {
2124 char *end;
2125 delta_search_threads = strtoul(arg+10, &end, 0);
2126 if (!arg[10] || *end || delta_search_threads < 0)
2127 usage(pack_usage);
2128 #ifndef THREADED_DELTA_SEARCH
2129 if (delta_search_threads != 1)
2130 warning("no threads support, "
2131 "ignoring %s", arg);
2132 #endif
2133 continue;
2134 }
2135 if (!prefixcmp(arg, "--depth=")) {
2136 char *end;
2137 depth = strtoul(arg+8, &end, 0);
2138 if (!arg[8] || *end)
2139 usage(pack_usage);
2140 continue;
2141 }
2142 if (!strcmp("--progress", arg)) {
2143 progress = 1;
2144 continue;
2145 }
2146 if (!strcmp("--all-progress", arg)) {
2147 progress = 2;
2148 continue;
2149 }
2150 if (!strcmp("-q", arg)) {
2151 progress = 0;
2152 continue;
2153 }
2154 if (!strcmp("--no-reuse-delta", arg)) {
2155 no_reuse_delta = 1;
2156 continue;
2157 }
2158 if (!strcmp("--no-reuse-object", arg)) {
2159 no_reuse_object = no_reuse_delta = 1;
2160 continue;
2161 }
2162 if (!strcmp("--delta-base-offset", arg)) {
2163 allow_ofs_delta = 1;
2164 continue;
2165 }
2166 if (!strcmp("--stdout", arg)) {
2167 pack_to_stdout = 1;
2168 continue;
2169 }
2170 if (!strcmp("--revs", arg)) {
2171 use_internal_rev_list = 1;
2172 continue;
2173 }
2174 if (!strcmp("--keep-unreachable", arg)) {
2175 keep_unreachable = 1;
2176 continue;
2177 }
2178 if (!strcmp("--unpacked", arg) ||
2179 !prefixcmp(arg, "--unpacked=") ||
2180 !strcmp("--reflog", arg) ||
2181 !strcmp("--all", arg)) {
2182 use_internal_rev_list = 1;
2183 if (rp_ac >= rp_ac_alloc - 1) {
2184 rp_ac_alloc = alloc_nr(rp_ac_alloc);
2185 rp_av = xrealloc(rp_av,
2186 rp_ac_alloc * sizeof(*rp_av));
2187 }
2188 rp_av[rp_ac++] = arg;
2189 continue;
2190 }
2191 if (!strcmp("--thin", arg)) {
2192 use_internal_rev_list = 1;
2193 thin = 1;
2194 rp_av[1] = "--objects-edge";
2195 continue;
2196 }
2197 if (!prefixcmp(arg, "--index-version=")) {
2198 char *c;
2199 pack_idx_default_version = strtoul(arg + 16, &c, 10);
2200 if (pack_idx_default_version > 2)
2201 die("bad %s", arg);
2202 if (*c == ',')
2203 pack_idx_off32_limit = strtoul(c+1, &c, 0);
2204 if (*c || pack_idx_off32_limit & 0x80000000)
2205 die("bad %s", arg);
2206 continue;
2207 }
2208 usage(pack_usage);
2209 }
2210
2211 /* Traditionally "pack-objects [options] base extra" failed;
2212 * we would however want to take refs parameter that would
2213 * have been given to upstream rev-list ourselves, which means
2214 * we somehow want to say what the base name is. So the
2215 * syntax would be:
2216 *
2217 * pack-objects [options] base <refs...>
2218 *
2219 * in other words, we would treat the first non-option as the
2220 * base_name and send everything else to the internal revision
2221 * walker.
2222 */
2223
2224 if (!pack_to_stdout)
2225 base_name = argv[i++];
2226
2227 if (pack_to_stdout != !base_name)
2228 usage(pack_usage);
2229
2230 if (!pack_to_stdout && !pack_size_limit)
2231 pack_size_limit = pack_size_limit_cfg;
2232
2233 if (pack_to_stdout && pack_size_limit)
2234 die("--max-pack-size cannot be used to build a pack for transfer.");
2235
2236 if (!pack_to_stdout && thin)
2237 die("--thin cannot be used to build an indexable pack.");
2238
2239 #ifdef THREADED_DELTA_SEARCH
2240 if (!delta_search_threads) /* --threads=0 means autodetect */
2241 delta_search_threads = online_cpus();
2242 #endif
2243
2244 prepare_packed_git();
2245
2246 if (progress)
2247 progress_state = start_progress("Counting objects", 0);
2248 if (!use_internal_rev_list)
2249 read_object_list_from_stdin();
2250 else {
2251 rp_av[rp_ac] = NULL;
2252 get_object_list(rp_ac, rp_av);
2253 }
2254 stop_progress(&progress_state);
2255
2256 if (non_empty && !nr_result)
2257 return 0;
2258 if (nr_result)
2259 prepare_pack(window, depth);
2260 write_pack_file();
2261 if (progress)
2262 fprintf(stderr, "Total %u (delta %u), reused %u (delta %u)\n",
2263 written, written_delta, reused, reused_delta);
2264 return 0;
2265 }