pack-objects: remove bogus comment
[git/git.git] / builtin / pack-objects.c
CommitLineData
5d4a6003 1#include "builtin.h"
c323ac7d 2#include "cache.h"
a74db82e 3#include "attr.h"
c323ac7d 4#include "object.h"
8e440259
PE
5#include "blob.h"
6#include "commit.h"
7#include "tag.h"
8#include "tree.h"
c323ac7d 9#include "delta.h"
a733cb60 10#include "pack.h"
3449f8c4 11#include "pack-revindex.h"
c38138cd 12#include "csum-file.h"
1b0c7174 13#include "tree-walk.h"
b5d97e6b
JH
14#include "diff.h"
15#include "revision.h"
16#include "list-objects.h"
96a02f8f 17#include "progress.h"
f0a24aa5 18#include "refs.h"
93749194 19#include "thread-utils.h"
8ecce684 20
812bdbc3 21static const char pack_usage[] =
0adda936 22 "git pack-objects [ -q | --progress | --all-progress ]\n"
4f366275 23 " [--all-progress-implied]\n"
62b4698e
ŠN
24 " [--max-pack-size=<n>] [--local] [--incremental]\n"
25 " [--window=<n>] [--window-memory=<n>] [--depth=<n>]\n"
812bdbc3 26 " [--no-reuse-delta] [--no-reuse-object] [--delta-base-offset]\n"
62b4698e 27 " [--threads=<n>] [--non-empty] [--revs [--unpacked | --all]]\n"
812bdbc3 28 " [--reflog] [--stdout | base-name] [--include-tag]\n"
86953531 29 " [--keep-unreachable | --unpack-unreachable]\n"
88422065 30 " [< ref-list | < object-list]";
c323ac7d 31
c323ac7d 32struct object_entry {
aa7e44bf 33 struct pack_idx_entry idx;
3f9ac8d2 34 unsigned long size; /* uncompressed size */
3f9ac8d2 35 struct packed_git *in_pack; /* already in pack */
6777a59f 36 off_t in_pack_offset;
a3fbf4df 37 struct object_entry *delta; /* delta base object */
82e5a82f 38 struct object_entry *delta_child; /* deltified objects who bases me */
15b4d577
JH
39 struct object_entry *delta_sibling; /* other deltified objects who
40 * uses the same base as me
41 */
074b2eea 42 void *delta_data; /* cached delta (uncompressed) */
a3fbf4df 43 unsigned long delta_size; /* delta data size (uncompressed) */
ed4a9031 44 unsigned long z_delta_size; /* delta data size (compressed) */
5a235b5e 45 unsigned int hash; /* name hint hash */
a3fbf4df
NP
46 enum object_type type;
47 enum object_type in_pack_type; /* could be delta */
48 unsigned char in_pack_header_size;
49 unsigned char preferred_base; /* we do not pack this, but is available
a74db82e 50 * to be used as the base object to delta
a3fbf4df
NP
51 * objects against.
52 */
a74db82e 53 unsigned char no_try_delta;
1b4bb16b
JH
54 unsigned char tagged; /* near the very tip of refs */
55 unsigned char filled; /* assigned write-order */
c323ac7d
LT
56};
57
3f9ac8d2 58/*
82e5a82f 59 * Objects we are going to pack are collected in objects array (dynamically
3f9ac8d2
JH
60 * expanded). nr_objects & nr_alloc controls this array. They are stored
61 * in the order we see -- typically rev-list --objects order that gives us
62 * nice "minimum seek" order.
3f9ac8d2 63 */
e4d58311 64static struct object_entry *objects;
79814f42 65static struct pack_idx_entry **written_list;
d01fb92f 66static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
3f9ac8d2 67
96f1e58f 68static int non_empty;
a7de7130 69static int reuse_delta = 1, reuse_object = 1;
e5e9714a 70static int keep_unreachable, unpack_unreachable, include_tag;
96f1e58f
DR
71static int local;
72static int incremental;
e96fb9b8 73static int ignore_packed_keep;
be6b1914 74static int allow_ofs_delta;
ebcfb379 75static struct pack_idx_option pack_idx_opts;
d01fb92f 76static const char *base_name;
024701f1 77static int progress = 1;
4812a93a 78static int window = 10;
568508e7 79static unsigned long pack_size_limit;
618e613a 80static int depth = 50;
43cc2b42 81static int delta_search_threads;
df6d6101 82static int pack_to_stdout;
8d1d8f83 83static int num_preferred_base;
dc6a0757 84static struct progress *progress_state;
960ccca6
DH
85static int pack_compression_level = Z_DEFAULT_COMPRESSION;
86static int pack_compression_seen;
c323ac7d 87
074b2eea 88static unsigned long delta_cache_size = 0;
5749b0b2 89static unsigned long max_delta_cache_size = 256 * 1024 * 1024;
e3dfddb3 90static unsigned long cache_max_small_delta_size = 1000;
074b2eea 91
a97773ce
BD
92static unsigned long window_memory_limit = 0;
93
3f9ac8d2
JH
94/*
95 * The object names in objects array are hashed with this hashtable,
e4d58311 96 * to help looking up the entry by object name.
3f9ac8d2
JH
97 * This hashtable is built after all the objects are seen.
98 */
96f1e58f
DR
99static int *object_ix;
100static int object_ix_hashsz;
1b4bb16b 101static struct object_entry *locate_object_entry(const unsigned char *sha1);
3f9ac8d2 102
3f9ac8d2
JH
103/*
104 * stats
105 */
7cadf491
SP
106static uint32_t written, written_delta;
107static uint32_t reused, reused_delta;
3f9ac8d2 108
780e6e73 109
3613f9b4 110static void *get_delta(struct object_entry *entry)
c323ac7d 111{
3613f9b4
NP
112 unsigned long size, base_size, delta_size;
113 void *buf, *base_buf, *delta_buf;
21666f1a 114 enum object_type type;
c323ac7d 115
3613f9b4
NP
116 buf = read_sha1_file(entry->idx.sha1, &type, &size);
117 if (!buf)
118 die("unable to read %s", sha1_to_hex(entry->idx.sha1));
119 base_buf = read_sha1_file(entry->delta->idx.sha1, &type, &base_size);
120 if (!base_buf)
aa7e44bf 121 die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
3613f9b4 122 delta_buf = diff_delta(base_buf, base_size,
dcde55bc 123 buf, size, &delta_size, 0);
3613f9b4 124 if (!delta_buf || delta_size != entry->delta_size)
a6080a0a 125 die("delta size changed");
3613f9b4
NP
126 free(buf);
127 free(base_buf);
c323ac7d
LT
128 return delta_buf;
129}
130
30ebb40a
NP
131static unsigned long do_compress(void **pptr, unsigned long size)
132{
ef49a7a0 133 git_zstream stream;
30ebb40a
NP
134 void *in, *out;
135 unsigned long maxsize;
136
137 memset(&stream, 0, sizeof(stream));
55bb5c91 138 git_deflate_init(&stream, pack_compression_level);
225a6f10 139 maxsize = git_deflate_bound(&stream, size);
30ebb40a
NP
140
141 in = *pptr;
142 out = xmalloc(maxsize);
143 *pptr = out;
144
145 stream.next_in = in;
146 stream.avail_in = size;
147 stream.next_out = out;
148 stream.avail_out = maxsize;
55bb5c91 149 while (git_deflate(&stream, Z_FINISH) == Z_OK)
30ebb40a 150 ; /* nothing */
55bb5c91 151 git_deflate_end(&stream);
30ebb40a
NP
152
153 free(in);
154 return stream.total_out;
155}
156
780e6e73
NP
157/*
158 * we are going to reuse the existing object data as is. make
159 * sure it is not corrupt.
160 */
079afb18
SP
161static int check_pack_inflate(struct packed_git *p,
162 struct pack_window **w_curs,
6777a59f
SP
163 off_t offset,
164 off_t len,
079afb18
SP
165 unsigned long expect)
166{
ef49a7a0 167 git_zstream stream;
079afb18
SP
168 unsigned char fakebuf[4096], *in;
169 int st;
170
171 memset(&stream, 0, sizeof(stream));
39c68542 172 git_inflate_init(&stream);
079afb18
SP
173 do {
174 in = use_pack(p, w_curs, offset, &stream.avail_in);
175 stream.next_in = in;
176 stream.next_out = fakebuf;
177 stream.avail_out = sizeof(fakebuf);
39c68542 178 st = git_inflate(&stream, Z_FINISH);
079afb18
SP
179 offset += stream.next_in - in;
180 } while (st == Z_OK || st == Z_BUF_ERROR);
39c68542 181 git_inflate_end(&stream);
079afb18
SP
182 return (st == Z_STREAM_END &&
183 stream.total_out == expect &&
184 stream.total_in == len) ? 0 : -1;
185}
186
187static void copy_pack_data(struct sha1file *f,
188 struct packed_git *p,
189 struct pack_window **w_curs,
6777a59f
SP
190 off_t offset,
191 off_t len)
079afb18
SP
192{
193 unsigned char *in;
ef49a7a0 194 unsigned long avail;
079afb18
SP
195
196 while (len) {
197 in = use_pack(p, w_curs, offset, &avail);
198 if (avail > len)
ef49a7a0 199 avail = (unsigned long)len;
079afb18
SP
200 sha1write(f, in, avail);
201 offset += avail;
202 len -= avail;
203 }
204}
205
1b4bb16b 206/* Return 0 if we will bust the pack-size limit */
d7dd0223 207static unsigned long write_object(struct sha1file *f,
17b08f2c
DH
208 struct object_entry *entry,
209 off_t write_offset)
c323ac7d 210{
30ebb40a 211 unsigned long size, limit, datalen;
3f9ac8d2 212 void *buf;
2c5ef824 213 unsigned char header[10], dheader[10];
6777a59f 214 unsigned hdrlen;
2c5ef824
NP
215 enum object_type type;
216 int usable_delta, to_reuse;
c323ac7d 217
78d1e84f
NP
218 if (!pack_to_stdout)
219 crc32_begin(f);
220
2c5ef824
NP
221 type = entry->type;
222
a2430dde 223 /* apply size limit if limited packsize and not first object */
a1e4760f
NP
224 if (!pack_size_limit || !nr_written)
225 limit = 0;
226 else if (pack_size_limit <= write_offset)
227 /*
228 * the earlier object did not fit the limit; avoid
229 * mistaking this with unlimited (i.e. limit = 0).
230 */
231 limit = 1;
232 else
233 limit = pack_size_limit - write_offset;
2c5ef824
NP
234
235 if (!entry->delta)
236 usable_delta = 0; /* no delta */
237 else if (!pack_size_limit)
238 usable_delta = 1; /* unlimited packfile */
239 else if (entry->delta->idx.offset == (off_t)-1)
240 usable_delta = 0; /* base was written to another pack */
241 else if (entry->delta->idx.offset)
242 usable_delta = 1; /* base already exists in this pack */
243 else
244 usable_delta = 0; /* base could end up in another pack */
245
a7de7130 246 if (!reuse_object)
fa736f72
NP
247 to_reuse = 0; /* explicit */
248 else if (!entry->in_pack)
ab7cd7bb 249 to_reuse = 0; /* can't reuse what we don't have */
2c5ef824 250 else if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA)
17b08f2c
DH
251 /* check_object() decided it for us ... */
252 to_reuse = usable_delta;
253 /* ... but pack split may override that */
2c5ef824 254 else if (type != entry->in_pack_type)
ab7cd7bb
JH
255 to_reuse = 0; /* pack has delta which is unusable */
256 else if (entry->delta)
257 to_reuse = 0; /* we want to pack afresh */
258 else
259 to_reuse = 1; /* we have it in-pack undeltified,
260 * and we do not need to deltify it.
261 */
262
df6d6101 263 if (!to_reuse) {
64bd76b1 264 no_reuse:
5476a8ad 265 if (!usable_delta) {
2c5ef824 266 buf = read_sha1_file(entry->idx.sha1, &type, &size);
5476a8ad 267 if (!buf)
aa7e44bf 268 die("unable to read %s", sha1_to_hex(entry->idx.sha1));
ed4a9031
NP
269 /*
270 * make sure no cached delta data remains from a
3ea3c215 271 * previous attempt before a pack split occurred.
ed4a9031
NP
272 */
273 free(entry->delta_data);
274 entry->delta_data = NULL;
275 entry->z_delta_size = 0;
5476a8ad 276 } else if (entry->delta_data) {
3f9ac8d2 277 size = entry->delta_size;
5476a8ad
NP
278 buf = entry->delta_data;
279 entry->delta_data = NULL;
2c5ef824 280 type = (allow_ofs_delta && entry->delta->idx.offset) ?
be6b1914 281 OBJ_OFS_DELTA : OBJ_REF_DELTA;
17b08f2c 282 } else {
3613f9b4 283 buf = get_delta(entry);
5476a8ad 284 size = entry->delta_size;
2c5ef824 285 type = (allow_ofs_delta && entry->delta->idx.offset) ?
5476a8ad 286 OBJ_OFS_DELTA : OBJ_REF_DELTA;
3f9ac8d2 287 }
ed4a9031
NP
288
289 if (entry->z_delta_size)
290 datalen = entry->z_delta_size;
291 else
292 datalen = do_compress(&buf, size);
8c3c7b2a 293
3f9ac8d2
JH
294 /*
295 * The object header is a byte of 'type' followed by zero or
be6b1914 296 * more bytes of length.
3f9ac8d2 297 */
1b22b6c8 298 hdrlen = encode_in_pack_object_header(type, size, header);
3f9ac8d2 299
2c5ef824 300 if (type == OBJ_OFS_DELTA) {
be6b1914
NP
301 /*
302 * Deltas with relative base contain an additional
303 * encoding of the relative offset for the delta
304 * base from this object's position in the pack.
305 */
aa7e44bf 306 off_t ofs = entry->idx.offset - entry->delta->idx.offset;
17b08f2c
DH
307 unsigned pos = sizeof(dheader) - 1;
308 dheader[pos] = ofs & 127;
be6b1914 309 while (ofs >>= 7)
17b08f2c
DH
310 dheader[--pos] = 128 | (--ofs & 127);
311 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
17b08f2c
DH
312 free(buf);
313 return 0;
314 }
315 sha1write(f, header, hdrlen);
316 sha1write(f, dheader + pos, sizeof(dheader) - pos);
317 hdrlen += sizeof(dheader) - pos;
2c5ef824 318 } else if (type == OBJ_REF_DELTA) {
be6b1914
NP
319 /*
320 * Deltas with a base reference contain
321 * an additional 20 bytes for the base sha1.
322 */
17b08f2c 323 if (limit && hdrlen + 20 + datalen + 20 >= limit) {
17b08f2c
DH
324 free(buf);
325 return 0;
326 }
327 sha1write(f, header, hdrlen);
aa7e44bf 328 sha1write(f, entry->delta->idx.sha1, 20);
3f9ac8d2 329 hdrlen += 20;
17b08f2c
DH
330 } else {
331 if (limit && hdrlen + datalen + 20 >= limit) {
17b08f2c
DH
332 free(buf);
333 return 0;
334 }
335 sha1write(f, header, hdrlen);
3f9ac8d2 336 }
30ebb40a 337 sha1write(f, buf, datalen);
3f9ac8d2 338 free(buf);
c323ac7d 339 }
3f9ac8d2
JH
340 else {
341 struct packed_git *p = entry->in_pack;
03e79c88 342 struct pack_window *w_curs = NULL;
91ecbeca 343 struct revindex_entry *revidx;
6777a59f 344 off_t offset;
3f9ac8d2 345
64bd76b1 346 if (entry->delta)
2c5ef824 347 type = (allow_ofs_delta && entry->delta->idx.offset) ?
780e6e73 348 OBJ_OFS_DELTA : OBJ_REF_DELTA;
1b22b6c8 349 hdrlen = encode_in_pack_object_header(type, entry->size, header);
64bd76b1 350
91ecbeca 351 offset = entry->in_pack_offset;
3449f8c4 352 revidx = find_pack_revindex(p, offset);
91ecbeca
NP
353 datalen = revidx[1].offset - offset;
354 if (!pack_to_stdout && p->index_version > 1 &&
64bd76b1
NP
355 check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
356 error("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
357 unuse_pack(&w_curs);
358 goto no_reuse;
359 }
360
91ecbeca
NP
361 offset += entry->in_pack_header_size;
362 datalen -= entry->in_pack_header_size;
64bd76b1
NP
363 if (!pack_to_stdout && p->index_version == 1 &&
364 check_pack_inflate(p, &w_curs, offset, datalen, entry->size)) {
365 error("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1));
366 unuse_pack(&w_curs);
367 goto no_reuse;
368 }
369
2c5ef824 370 if (type == OBJ_OFS_DELTA) {
aa7e44bf 371 off_t ofs = entry->idx.offset - entry->delta->idx.offset;
17b08f2c
DH
372 unsigned pos = sizeof(dheader) - 1;
373 dheader[pos] = ofs & 127;
374 while (ofs >>= 7)
375 dheader[--pos] = 128 | (--ofs & 127);
59dd9ed1
NP
376 if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
377 unuse_pack(&w_curs);
17b08f2c 378 return 0;
59dd9ed1 379 }
17b08f2c
DH
380 sha1write(f, header, hdrlen);
381 sha1write(f, dheader + pos, sizeof(dheader) - pos);
382 hdrlen += sizeof(dheader) - pos;
64bd76b1 383 reused_delta++;
2c5ef824 384 } else if (type == OBJ_REF_DELTA) {
59dd9ed1
NP
385 if (limit && hdrlen + 20 + datalen + 20 >= limit) {
386 unuse_pack(&w_curs);
17b08f2c 387 return 0;
59dd9ed1 388 }
17b08f2c 389 sha1write(f, header, hdrlen);
aa7e44bf 390 sha1write(f, entry->delta->idx.sha1, 20);
17b08f2c 391 hdrlen += 20;
64bd76b1 392 reused_delta++;
17b08f2c 393 } else {
59dd9ed1
NP
394 if (limit && hdrlen + datalen + 20 >= limit) {
395 unuse_pack(&w_curs);
17b08f2c 396 return 0;
59dd9ed1 397 }
17b08f2c
DH
398 sha1write(f, header, hdrlen);
399 }
079afb18 400 copy_pack_data(f, p, &w_curs, offset, datalen);
03e79c88 401 unuse_pack(&w_curs);
3f9ac8d2 402 reused++;
a733cb60 403 }
17b08f2c 404 if (usable_delta)
ab7cd7bb 405 written_delta++;
3f9ac8d2 406 written++;
78d1e84f 407 if (!pack_to_stdout)
aa7e44bf 408 entry->idx.crc32 = crc32_end(f);
c323ac7d
LT
409 return hdrlen + datalen;
410}
411
f63c79db
JH
412enum write_one_status {
413 WRITE_ONE_SKIP = -1, /* already written */
414 WRITE_ONE_BREAK = 0, /* writing this will bust the limit; not written */
415 WRITE_ONE_WRITTEN = 1, /* normal */
416 WRITE_ONE_RECURSIVE = 2 /* already scheduled to be written */
417};
418
419static enum write_one_status write_one(struct sha1file *f,
420 struct object_entry *e,
421 off_t *offset)
9d5ab962 422{
d7dd0223 423 unsigned long size;
f63c79db 424 int recursing;
d7dd0223 425
f63c79db
JH
426 /*
427 * we set offset to 1 (which is an impossible value) to mark
428 * the fact that this object is involved in "write its base
429 * first before writing a deltified object" recursion.
430 */
431 recursing = (e->idx.offset == 1);
432 if (recursing) {
433 warning("recursive delta detected for object %s",
434 sha1_to_hex(e->idx.sha1));
435 return WRITE_ONE_RECURSIVE;
436 } else if (e->idx.offset || e->preferred_base) {
437 /* offset is non zero if object is written already. */
438 return WRITE_ONE_SKIP;
439 }
d7dd0223 440
720c9f7b 441 /* if we are deltified, write out base object first. */
f63c79db
JH
442 if (e->delta) {
443 e->idx.offset = 1; /* now recurse */
444 switch (write_one(f, e->delta, offset)) {
445 case WRITE_ONE_RECURSIVE:
446 /* we cannot depend on this one */
447 e->delta = NULL;
448 break;
449 default:
450 break;
451 case WRITE_ONE_BREAK:
452 e->idx.offset = recursing;
453 return WRITE_ONE_BREAK;
454 }
455 }
d7dd0223 456
6ed7f25e
NP
457 e->idx.offset = *offset;
458 size = write_object(f, e, *offset);
17b08f2c 459 if (!size) {
f63c79db
JH
460 e->idx.offset = recursing;
461 return WRITE_ONE_BREAK;
17b08f2c 462 }
79814f42 463 written_list[nr_written++] = &e->idx;
d7dd0223
NP
464
465 /* make sure off_t is sufficiently large not to wrap */
c03c8315 466 if (signed_add_overflows(*offset, size))
d7dd0223 467 die("pack too large for current definition of off_t");
6ed7f25e 468 *offset += size;
f63c79db 469 return WRITE_ONE_WRITTEN;
9d5ab962
JH
470}
471
1b4bb16b
JH
472static int mark_tagged(const char *path, const unsigned char *sha1, int flag,
473 void *cb_data)
474{
475 unsigned char peeled[20];
476 struct object_entry *entry = locate_object_entry(sha1);
477
478 if (entry)
479 entry->tagged = 1;
480 if (!peel_ref(path, peeled)) {
481 entry = locate_object_entry(peeled);
482 if (entry)
483 entry->tagged = 1;
484 }
485 return 0;
486}
487
be126818 488static inline void add_to_write_order(struct object_entry **wo,
92bef1a1 489 unsigned int *endp,
1b4bb16b
JH
490 struct object_entry *e)
491{
492 if (e->filled)
493 return;
494 wo[(*endp)++] = e;
495 e->filled = 1;
496}
497
498static void add_descendants_to_write_order(struct object_entry **wo,
92bef1a1 499 unsigned int *endp,
1b4bb16b
JH
500 struct object_entry *e)
501{
f380872f
DM
502 int add_to_order = 1;
503 while (e) {
504 if (add_to_order) {
505 struct object_entry *s;
506 /* add this node... */
507 add_to_write_order(wo, endp, e);
508 /* all its siblings... */
509 for (s = e->delta_sibling; s; s = s->delta_sibling) {
510 add_to_write_order(wo, endp, s);
511 }
512 }
513 /* drop down a level to add left subtree nodes if possible */
514 if (e->delta_child) {
515 add_to_order = 1;
516 e = e->delta_child;
517 } else {
518 add_to_order = 0;
519 /* our sibling might have some children, it is next */
520 if (e->delta_sibling) {
521 e = e->delta_sibling;
522 continue;
523 }
524 /* go back to our parent node */
525 e = e->delta;
526 while (e && !e->delta_sibling) {
527 /* we're on the right side of a subtree, keep
528 * going up until we can go right again */
529 e = e->delta;
530 }
531 if (!e) {
532 /* done- we hit our original root node */
533 return;
534 }
535 /* pass it off to sibling at this level */
536 e = e->delta_sibling;
537 }
538 };
1b4bb16b
JH
539}
540
541static void add_family_to_write_order(struct object_entry **wo,
92bef1a1 542 unsigned int *endp,
1b4bb16b
JH
543 struct object_entry *e)
544{
545 struct object_entry *root;
546
547 for (root = e; root->delta; root = root->delta)
548 ; /* nothing */
1b4bb16b
JH
549 add_descendants_to_write_order(wo, endp, root);
550}
551
552static struct object_entry **compute_write_order(void)
553{
38d4debb 554 unsigned int i, wo_end, last_untagged;
1b4bb16b
JH
555
556 struct object_entry **wo = xmalloc(nr_objects * sizeof(*wo));
557
558 for (i = 0; i < nr_objects; i++) {
559 objects[i].tagged = 0;
560 objects[i].filled = 0;
561 objects[i].delta_child = NULL;
562 objects[i].delta_sibling = NULL;
563 }
564
565 /*
566 * Fully connect delta_child/delta_sibling network.
567 * Make sure delta_sibling is sorted in the original
568 * recency order.
569 */
92bef1a1
DM
570 for (i = nr_objects; i > 0;) {
571 struct object_entry *e = &objects[--i];
1b4bb16b
JH
572 if (!e->delta)
573 continue;
574 /* Mark me as the first child */
575 e->delta_sibling = e->delta->delta_child;
576 e->delta->delta_child = e;
577 }
578
579 /*
580 * Mark objects that are at the tip of tags.
581 */
582 for_each_tag_ref(mark_tagged, NULL);
583
584 /*
38d4debb 585 * Give the objects in the original recency order until
1b4bb16b
JH
586 * we see a tagged tip.
587 */
588 for (i = wo_end = 0; i < nr_objects; i++) {
589 if (objects[i].tagged)
590 break;
591 add_to_write_order(wo, &wo_end, &objects[i]);
592 }
38d4debb 593 last_untagged = i;
1b4bb16b
JH
594
595 /*
596 * Then fill all the tagged tips.
597 */
598 for (; i < nr_objects; i++) {
599 if (objects[i].tagged)
600 add_to_write_order(wo, &wo_end, &objects[i]);
601 }
602
603 /*
604 * And then all remaining commits and tags.
605 */
38d4debb 606 for (i = last_untagged; i < nr_objects; i++) {
1b4bb16b
JH
607 if (objects[i].type != OBJ_COMMIT &&
608 objects[i].type != OBJ_TAG)
609 continue;
610 add_to_write_order(wo, &wo_end, &objects[i]);
611 }
612
613 /*
614 * And then all the trees.
615 */
38d4debb 616 for (i = last_untagged; i < nr_objects; i++) {
1b4bb16b
JH
617 if (objects[i].type != OBJ_TREE)
618 continue;
619 add_to_write_order(wo, &wo_end, &objects[i]);
620 }
621
622 /*
623 * Finally all the rest in really tight order
624 */
38d4debb
DM
625 for (i = last_untagged; i < nr_objects; i++) {
626 if (!objects[i].filled)
627 add_family_to_write_order(wo, &wo_end, &objects[i]);
628 }
629
630 if (wo_end != nr_objects)
631 die("ordered %u objects, expected %"PRIu32, wo_end, nr_objects);
1b4bb16b
JH
632
633 return wo;
634}
635
d01fb92f 636static void write_pack_file(void)
c323ac7d 637{
ebe27b13 638 uint32_t i = 0, j;
d22b9290 639 struct sha1file *f;
6ed7f25e 640 off_t offset;
ebe27b13 641 uint32_t nr_remaining = nr_result;
f746bae8 642 time_t last_mtime = 0;
1b4bb16b 643 struct object_entry **write_order;
81a216a5 644
bcd7954e 645 if (progress > pack_to_stdout)
dc6a0757 646 progress_state = start_progress("Writing objects", nr_result);
79814f42 647 written_list = xmalloc(nr_objects * sizeof(*written_list));
1b4bb16b 648 write_order = compute_write_order();
183bdb2c 649
ebe27b13 650 do {
aa7e44bf 651 unsigned char sha1[20];
7ba502c4 652 char *pack_tmp_name = NULL;
aa7e44bf 653
cdf9db3c 654 if (pack_to_stdout)
2a128d63 655 f = sha1fd_throughput(1, "<stdout>", progress_state);
cdf9db3c
JH
656 else
657 f = create_tmp_packfile(&pack_tmp_name);
ebe27b13 658
c0ad4657
JH
659 offset = write_pack_header(f, nr_remaining);
660 if (!offset)
661 die_errno("unable to write pack header");
ebe27b13 662 nr_written = 0;
720c9f7b 663 for (; i < nr_objects; i++) {
1b4bb16b 664 struct object_entry *e = write_order[i];
cddec4f8 665 if (write_one(f, e, &offset) == WRITE_ONE_BREAK)
720c9f7b
NP
666 break;
667 display_progress(progress_state, written);
668 }
c553ca25 669
ebe27b13
DH
670 /*
671 * Did we write the wrong # entries in the header?
672 * If so, rewrite it like in fast-import
673 */
54352bb2
LT
674 if (pack_to_stdout) {
675 sha1close(f, sha1, CSUM_CLOSE);
676 } else if (nr_written == nr_remaining) {
677 sha1close(f, sha1, CSUM_FSYNC);
ebe27b13 678 } else {
ac0463ed 679 int fd = sha1close(f, sha1, 0);
abeb40e5 680 fixup_pack_header_footer(fd, sha1, pack_tmp_name,
ac0463ed 681 nr_written, sha1, offset);
7ba502c4 682 close(fd);
ebe27b13
DH
683 }
684
685 if (!pack_to_stdout) {
f746bae8 686 struct stat st;
3bb72562 687 char tmpname[PATH_MAX];
d01fb92f 688
f746bae8
NP
689 /*
690 * Packs are runtime accessed in their mtime
691 * order since newer packs are more likely to contain
692 * younger objects. So if we are creating multiple
693 * packs then we should modify the mtime of later ones
694 * to preserve this property.
695 */
0e990530 696 if (stat(pack_tmp_name, &st) < 0) {
f746bae8 697 warning("failed to stat %s: %s",
0e990530 698 pack_tmp_name, strerror(errno));
f746bae8
NP
699 } else if (!last_mtime) {
700 last_mtime = st.st_mtime;
701 } else {
702 struct utimbuf utb;
703 utb.actime = st.st_atime;
704 utb.modtime = --last_mtime;
0e990530 705 if (utime(pack_tmp_name, &utb) < 0)
f746bae8
NP
706 warning("failed utime() on %s: %s",
707 tmpname, strerror(errno));
708 }
709
0e990530
JH
710 /* Enough space for "-<sha-1>.pack"? */
711 if (sizeof(tmpname) <= strlen(base_name) + 50)
712 die("pack base name '%s' too long", base_name);
713 snprintf(tmpname, sizeof(tmpname), "%s-", base_name);
714 finish_tmp_packfile(tmpname, pack_tmp_name,
715 written_list, nr_written,
716 &pack_idx_opts, sha1);
7ba502c4 717 free(pack_tmp_name);
aa7e44bf 718 puts(sha1_to_hex(sha1));
ebe27b13
DH
719 }
720
721 /* mark written objects as written to previous pack */
722 for (j = 0; j < nr_written; j++) {
79814f42 723 written_list[j]->offset = (off_t)-1;
ebe27b13
DH
724 }
725 nr_remaining -= nr_written;
720c9f7b 726 } while (nr_remaining && i < nr_objects);
ebe27b13
DH
727
728 free(written_list);
1b4bb16b 729 free(write_order);
4d4fcc54 730 stop_progress(&progress_state);
67c08ce1 731 if (written != nr_result)
6e1c2344
RJ
732 die("wrote %"PRIu32" objects while expecting %"PRIu32,
733 written, nr_result);
c323ac7d
LT
734}
735
7a979d99
JH
736static int locate_object_entry_hash(const unsigned char *sha1)
737{
738 int i;
739 unsigned int ui;
740 memcpy(&ui, sha1, sizeof(unsigned int));
741 i = ui % object_ix_hashsz;
742 while (0 < object_ix[i]) {
aa7e44bf 743 if (!hashcmp(sha1, objects[object_ix[i] - 1].idx.sha1))
7a979d99
JH
744 return i;
745 if (++i == object_ix_hashsz)
746 i = 0;
747 }
748 return -1 - i;
749}
750
751static struct object_entry *locate_object_entry(const unsigned char *sha1)
752{
753 int i;
754
755 if (!object_ix_hashsz)
756 return NULL;
757
758 i = locate_object_entry_hash(sha1);
759 if (0 <= i)
760 return &objects[object_ix[i]-1];
761 return NULL;
762}
763
764static void rehash_objects(void)
c323ac7d 765{
7cadf491 766 uint32_t i;
7a979d99
JH
767 struct object_entry *oe;
768
769 object_ix_hashsz = nr_objects * 3;
770 if (object_ix_hashsz < 1024)
771 object_ix_hashsz = 1024;
772 object_ix = xrealloc(object_ix, sizeof(int) * object_ix_hashsz);
5379a5c5 773 memset(object_ix, 0, sizeof(int) * object_ix_hashsz);
7a979d99 774 for (i = 0, oe = objects; i < nr_objects; i++, oe++) {
aa7e44bf 775 int ix = locate_object_entry_hash(oe->idx.sha1);
7a979d99
JH
776 if (0 <= ix)
777 continue;
778 ix = -1 - ix;
779 object_ix[ix] = i + 1;
780 }
781}
782
ce0bd642 783static unsigned name_hash(const char *name)
1d6b38cc 784{
48fb7deb 785 unsigned c, hash = 0;
ce0bd642 786
bc32fed5
JH
787 if (!name)
788 return 0;
789
eeef7135 790 /*
ce0bd642
LT
791 * This effectively just creates a sortable number from the
792 * last sixteen non-whitespace characters. Last characters
793 * count "most", so things that end in ".c" sort together.
eeef7135 794 */
ce0bd642
LT
795 while ((c = *name++) != 0) {
796 if (isspace(c))
797 continue;
798 hash = (hash >> 2) + (c << 24);
799 }
1d6b38cc
JH
800 return hash;
801}
802
a74db82e
JH
803static void setup_delta_attr_check(struct git_attr_check *check)
804{
805 static struct git_attr *attr_delta;
806
807 if (!attr_delta)
7fb0eaa2 808 attr_delta = git_attr("delta");
a74db82e
JH
809
810 check[0].attr = attr_delta;
811}
812
813static int no_try_delta(const char *path)
814{
815 struct git_attr_check check[1];
816
817 setup_delta_attr_check(check);
d932f4eb 818 if (git_check_attr(path, ARRAY_SIZE(check), check))
a74db82e
JH
819 return 0;
820 if (ATTR_FALSE(check->value))
821 return 1;
822 return 0;
823}
824
5c49c116 825static int add_object_entry(const unsigned char *sha1, enum object_type type,
bc32fed5 826 const char *name, int exclude)
c323ac7d 827{
c323ac7d 828 struct object_entry *entry;
29b734e4 829 struct packed_git *p, *found_pack = NULL;
6777a59f 830 off_t found_offset = 0;
29b734e4 831 int ix;
bc32fed5 832 unsigned hash = name_hash(name);
29b734e4
NP
833
834 ix = nr_objects ? locate_object_entry_hash(sha1) : -1;
835 if (ix >= 0) {
836 if (exclude) {
837 entry = objects + object_ix[ix] - 1;
81a216a5
NP
838 if (!entry->preferred_base)
839 nr_result--;
29b734e4
NP
840 entry->preferred_base = 1;
841 }
842 return 0;
843 }
c323ac7d 844
daae0625
BC
845 if (!exclude && local && has_loose_object_nonlocal(sha1))
846 return 0;
847
5c49c116
NP
848 for (p = packed_git; p; p = p->next) {
849 off_t offset = find_pack_entry_one(sha1, p);
850 if (offset) {
851 if (!found_pack) {
4c080182 852 if (!is_pack_valid(p)) {
58a6a9cc 853 warning("packfile %s cannot be accessed", p->pack_name);
4c080182
JK
854 continue;
855 }
5c49c116
NP
856 found_offset = offset;
857 found_pack = p;
64560374 858 }
5c49c116
NP
859 if (exclude)
860 break;
861 if (incremental)
862 return 0;
863 if (local && !p->pack_local)
864 return 0;
e96fb9b8
BC
865 if (ignore_packed_keep && p->pack_local && p->pack_keep)
866 return 0;
64560374
LT
867 }
868 }
eb019375 869
29b734e4
NP
870 if (nr_objects >= nr_alloc) {
871 nr_alloc = (nr_alloc + 1024) * 3 / 2;
7cadf491 872 objects = xrealloc(objects, nr_alloc * sizeof(*entry));
c323ac7d 873 }
29b734e4
NP
874
875 entry = objects + nr_objects++;
c323ac7d 876 memset(entry, 0, sizeof(*entry));
aa7e44bf 877 hashcpy(entry->idx.sha1, sha1);
27225f2e 878 entry->hash = hash;
5c49c116
NP
879 if (type)
880 entry->type = type;
29b734e4
NP
881 if (exclude)
882 entry->preferred_base = 1;
81a216a5
NP
883 else
884 nr_result++;
29b734e4
NP
885 if (found_pack) {
886 entry->in_pack = found_pack;
887 entry->in_pack_offset = found_offset;
888 }
7a979d99
JH
889
890 if (object_ix_hashsz * 3 <= nr_objects * 4)
891 rehash_objects();
29b734e4
NP
892 else
893 object_ix[-1 - ix] = nr_objects;
7a979d99 894
4d4fcc54 895 display_progress(progress_state, nr_objects);
29b734e4 896
a74db82e
JH
897 if (name && no_try_delta(name))
898 entry->no_try_delta = 1;
899
29b734e4 900 return 1;
c323ac7d
LT
901}
902
5379a5c5
JH
903struct pbase_tree_cache {
904 unsigned char sha1[20];
905 int ref;
906 int temporary;
907 void *tree_data;
908 unsigned long tree_size;
909};
910
911static struct pbase_tree_cache *(pbase_tree_cache[256]);
912static int pbase_tree_cache_ix(const unsigned char *sha1)
913{
914 return sha1[0] % ARRAY_SIZE(pbase_tree_cache);
915}
916static int pbase_tree_cache_ix_incr(int ix)
917{
918 return (ix+1) % ARRAY_SIZE(pbase_tree_cache);
919}
920
921static struct pbase_tree {
922 struct pbase_tree *next;
923 /* This is a phony "cache" entry; we are not
924 * going to evict it nor find it through _get()
925 * mechanism -- this is for the toplevel node that
926 * would almost always change with any commit.
927 */
928 struct pbase_tree_cache pcache;
929} *pbase_tree;
930
931static struct pbase_tree_cache *pbase_tree_get(const unsigned char *sha1)
932{
933 struct pbase_tree_cache *ent, *nent;
934 void *data;
935 unsigned long size;
21666f1a 936 enum object_type type;
5379a5c5
JH
937 int neigh;
938 int my_ix = pbase_tree_cache_ix(sha1);
939 int available_ix = -1;
940
941 /* pbase-tree-cache acts as a limited hashtable.
942 * your object will be found at your index or within a few
943 * slots after that slot if it is cached.
944 */
945 for (neigh = 0; neigh < 8; neigh++) {
946 ent = pbase_tree_cache[my_ix];
a89fccd2 947 if (ent && !hashcmp(ent->sha1, sha1)) {
5379a5c5
JH
948 ent->ref++;
949 return ent;
950 }
951 else if (((available_ix < 0) && (!ent || !ent->ref)) ||
952 ((0 <= available_ix) &&
953 (!ent && pbase_tree_cache[available_ix])))
954 available_ix = my_ix;
955 if (!ent)
956 break;
957 my_ix = pbase_tree_cache_ix_incr(my_ix);
958 }
959
960 /* Did not find one. Either we got a bogus request or
961 * we need to read and perhaps cache.
962 */
21666f1a 963 data = read_sha1_file(sha1, &type, &size);
5379a5c5
JH
964 if (!data)
965 return NULL;
21666f1a 966 if (type != OBJ_TREE) {
5379a5c5
JH
967 free(data);
968 return NULL;
969 }
970
971 /* We need to either cache or return a throwaway copy */
972
973 if (available_ix < 0)
974 ent = NULL;
975 else {
976 ent = pbase_tree_cache[available_ix];
977 my_ix = available_ix;
978 }
979
980 if (!ent) {
981 nent = xmalloc(sizeof(*nent));
982 nent->temporary = (available_ix < 0);
983 }
984 else {
985 /* evict and reuse */
986 free(ent->tree_data);
987 nent = ent;
988 }
e702496e 989 hashcpy(nent->sha1, sha1);
5379a5c5
JH
990 nent->tree_data = data;
991 nent->tree_size = size;
992 nent->ref = 1;
993 if (!nent->temporary)
994 pbase_tree_cache[my_ix] = nent;
995 return nent;
996}
997
998static void pbase_tree_put(struct pbase_tree_cache *cache)
999{
1000 if (!cache->temporary) {
1001 cache->ref--;
1002 return;
1003 }
1004 free(cache->tree_data);
1005 free(cache);
1006}
1007
1008static int name_cmp_len(const char *name)
1009{
1010 int i;
1011 for (i = 0; name[i] && name[i] != '\n' && name[i] != '/'; i++)
1012 ;
1013 return i;
1014}
1015
1016static void add_pbase_object(struct tree_desc *tree,
5379a5c5 1017 const char *name,
ce0bd642
LT
1018 int cmplen,
1019 const char *fullname)
3f9ac8d2 1020{
4c068a98 1021 struct name_entry entry;
8a5a8d6c 1022 int cmp;
4c068a98
LT
1023
1024 while (tree_entry(tree,&entry)) {
1211be6b
LT
1025 if (S_ISGITLINK(entry.mode))
1026 continue;
0de16337 1027 cmp = tree_entry_len(&entry) != cmplen ? 1 :
8a5a8d6c
NP
1028 memcmp(name, entry.path, cmplen);
1029 if (cmp > 0)
7a979d99 1030 continue;
8a5a8d6c
NP
1031 if (cmp < 0)
1032 return;
5379a5c5 1033 if (name[cmplen] != '/') {
5c49c116 1034 add_object_entry(entry.sha1,
4d1012c3 1035 object_type(entry.mode),
bc32fed5 1036 fullname, 1);
5379a5c5
JH
1037 return;
1038 }
8a5a8d6c 1039 if (S_ISDIR(entry.mode)) {
7a979d99 1040 struct tree_desc sub;
5379a5c5
JH
1041 struct pbase_tree_cache *tree;
1042 const char *down = name+cmplen+1;
1043 int downlen = name_cmp_len(down);
1044
4c068a98 1045 tree = pbase_tree_get(entry.sha1);
5379a5c5
JH
1046 if (!tree)
1047 return;
6fda5e51 1048 init_tree_desc(&sub, tree->tree_data, tree->tree_size);
5379a5c5 1049
ce0bd642 1050 add_pbase_object(&sub, down, downlen, fullname);
5379a5c5
JH
1051 pbase_tree_put(tree);
1052 }
1053 }
1054}
1d6b38cc 1055
5379a5c5
JH
1056static unsigned *done_pbase_paths;
1057static int done_pbase_paths_num;
1058static int done_pbase_paths_alloc;
1059static int done_pbase_path_pos(unsigned hash)
1060{
1061 int lo = 0;
1062 int hi = done_pbase_paths_num;
1063 while (lo < hi) {
1064 int mi = (hi + lo) / 2;
1065 if (done_pbase_paths[mi] == hash)
1066 return mi;
1067 if (done_pbase_paths[mi] < hash)
1068 hi = mi;
1069 else
1070 lo = mi + 1;
1071 }
1072 return -lo-1;
1073}
1074
1075static int check_pbase_path(unsigned hash)
1076{
1077 int pos = (!done_pbase_paths) ? -1 : done_pbase_path_pos(hash);
1078 if (0 <= pos)
1079 return 1;
1080 pos = -pos - 1;
1081 if (done_pbase_paths_alloc <= done_pbase_paths_num) {
1082 done_pbase_paths_alloc = alloc_nr(done_pbase_paths_alloc);
1083 done_pbase_paths = xrealloc(done_pbase_paths,
1084 done_pbase_paths_alloc *
1085 sizeof(unsigned));
1086 }
1087 done_pbase_paths_num++;
1088 if (pos < done_pbase_paths_num)
1089 memmove(done_pbase_paths + pos + 1,
1090 done_pbase_paths + pos,
1091 (done_pbase_paths_num - pos - 1) * sizeof(unsigned));
1092 done_pbase_paths[pos] = hash;
1093 return 0;
1094}
1095
bc32fed5 1096static void add_preferred_base_object(const char *name)
5379a5c5
JH
1097{
1098 struct pbase_tree *it;
8a5a8d6c 1099 int cmplen;
bc32fed5 1100 unsigned hash = name_hash(name);
5379a5c5 1101
8a5a8d6c 1102 if (!num_preferred_base || check_pbase_path(hash))
5379a5c5
JH
1103 return;
1104
8a5a8d6c 1105 cmplen = name_cmp_len(name);
5379a5c5
JH
1106 for (it = pbase_tree; it; it = it->next) {
1107 if (cmplen == 0) {
bc32fed5 1108 add_object_entry(it->pcache.sha1, OBJ_TREE, NULL, 1);
5379a5c5
JH
1109 }
1110 else {
1111 struct tree_desc tree;
6fda5e51 1112 init_tree_desc(&tree, it->pcache.tree_data, it->pcache.tree_size);
ce0bd642 1113 add_pbase_object(&tree, name, cmplen, name);
7a979d99 1114 }
3f9ac8d2 1115 }
3f9ac8d2
JH
1116}
1117
7a979d99 1118static void add_preferred_base(unsigned char *sha1)
3f9ac8d2 1119{
5379a5c5
JH
1120 struct pbase_tree *it;
1121 void *data;
1122 unsigned long size;
1123 unsigned char tree_sha1[20];
1d6b38cc 1124
8d1d8f83
JH
1125 if (window <= num_preferred_base++)
1126 return;
1127
5379a5c5
JH
1128 data = read_object_with_reference(sha1, tree_type, &size, tree_sha1);
1129 if (!data)
7a979d99 1130 return;
5379a5c5
JH
1131
1132 for (it = pbase_tree; it; it = it->next) {
a89fccd2 1133 if (!hashcmp(it->pcache.sha1, tree_sha1)) {
5379a5c5
JH
1134 free(data);
1135 return;
1136 }
1137 }
1138
1139 it = xcalloc(1, sizeof(*it));
1140 it->next = pbase_tree;
1141 pbase_tree = it;
1142
e702496e 1143 hashcpy(it->pcache.sha1, tree_sha1);
5379a5c5
JH
1144 it->pcache.tree_data = data;
1145 it->pcache.tree_size = size;
3f9ac8d2
JH
1146}
1147
0ef95f72
NP
1148static void cleanup_preferred_base(void)
1149{
1150 struct pbase_tree *it;
1151 unsigned i;
1152
1153 it = pbase_tree;
1154 pbase_tree = NULL;
1155 while (it) {
1156 struct pbase_tree *this = it;
1157 it = this->next;
1158 free(this->pcache.tree_data);
1159 free(this);
1160 }
1161
1162 for (i = 0; i < ARRAY_SIZE(pbase_tree_cache); i++) {
1163 if (!pbase_tree_cache[i])
1164 continue;
1165 free(pbase_tree_cache[i]->tree_data);
1166 free(pbase_tree_cache[i]);
1167 pbase_tree_cache[i] = NULL;
1168 }
1169
1170 free(done_pbase_paths);
1171 done_pbase_paths = NULL;
1172 done_pbase_paths_num = done_pbase_paths_alloc = 0;
1173}
1174
c323ac7d
LT
1175static void check_object(struct object_entry *entry)
1176{
5c49c116 1177 if (entry->in_pack) {
780e6e73 1178 struct packed_git *p = entry->in_pack;
03e79c88 1179 struct pack_window *w_curs = NULL;
5c49c116
NP
1180 const unsigned char *base_ref = NULL;
1181 struct object_entry *base_entry;
1182 unsigned long used, used_0;
ef49a7a0 1183 unsigned long avail;
5c49c116
NP
1184 off_t ofs;
1185 unsigned char *buf, c;
780e6e73 1186
6777a59f 1187 buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail);
ab7cd7bb 1188
5c49c116 1189 /*
fa736f72
NP
1190 * We want in_pack_type even if we do not reuse delta
1191 * since non-delta representations could still be reused.
ab7cd7bb 1192 */
09ded04b 1193 used = unpack_object_header_buffer(buf, avail,
5c49c116
NP
1194 &entry->in_pack_type,
1195 &entry->size);
03d66015
NP
1196 if (used == 0)
1197 goto give_up;
ab7cd7bb 1198
5c49c116
NP
1199 /*
1200 * Determine if this is a delta and if so whether we can
1201 * reuse it or not. Otherwise let's find out as cheaply as
1202 * possible what the actual type and size for this object is.
3f9ac8d2 1203 */
5c49c116
NP
1204 switch (entry->in_pack_type) {
1205 default:
1206 /* Not a delta hence we've already got all we need. */
1207 entry->type = entry->in_pack_type;
1208 entry->in_pack_header_size = used;
03d66015
NP
1209 if (entry->type < OBJ_COMMIT || entry->type > OBJ_BLOB)
1210 goto give_up;
5c49c116
NP
1211 unuse_pack(&w_curs);
1212 return;
1213 case OBJ_REF_DELTA:
a7de7130 1214 if (reuse_delta && !entry->preferred_base)
5c49c116
NP
1215 base_ref = use_pack(p, &w_curs,
1216 entry->in_pack_offset + used, NULL);
1217 entry->in_pack_header_size = used + 20;
1218 break;
1219 case OBJ_OFS_DELTA:
1220 buf = use_pack(p, &w_curs,
1221 entry->in_pack_offset + used, NULL);
1222 used_0 = 0;
1223 c = buf[used_0++];
1224 ofs = c & 127;
1225 while (c & 128) {
1226 ofs += 1;
03d66015
NP
1227 if (!ofs || MSB(ofs, 7)) {
1228 error("delta base offset overflow in pack for %s",
1229 sha1_to_hex(entry->idx.sha1));
1230 goto give_up;
1231 }
5c49c116
NP
1232 c = buf[used_0++];
1233 ofs = (ofs << 7) + (c & 127);
780e6e73 1234 }
5c49c116 1235 ofs = entry->in_pack_offset - ofs;
03d66015
NP
1236 if (ofs <= 0 || ofs >= entry->in_pack_offset) {
1237 error("delta base offset out of bound for %s",
1238 sha1_to_hex(entry->idx.sha1));
1239 goto give_up;
1240 }
a7de7130 1241 if (reuse_delta && !entry->preferred_base) {
3449f8c4
NP
1242 struct revindex_entry *revidx;
1243 revidx = find_pack_revindex(p, ofs);
08698b1e
NP
1244 if (!revidx)
1245 goto give_up;
3449f8c4
NP
1246 base_ref = nth_packed_object_sha1(p, revidx->nr);
1247 }
5c49c116
NP
1248 entry->in_pack_header_size = used + used_0;
1249 break;
780e6e73 1250 }
780e6e73 1251
5c49c116
NP
1252 if (base_ref && (base_entry = locate_object_entry(base_ref))) {
1253 /*
1254 * If base_ref was set above that means we wish to
1255 * reuse delta data, and we even found that base
1256 * in the list of objects we want to pack. Goodie!
1257 *
1258 * Depth value does not matter - find_deltas() will
1259 * never consider reused delta as the base object to
1260 * deltify other objects against, in order to avoid
1261 * circular deltas.
3f9ac8d2 1262 */
780e6e73 1263 entry->type = entry->in_pack_type;
5c49c116 1264 entry->delta = base_entry;
64bd76b1 1265 entry->delta_size = entry->size;
15b4d577
JH
1266 entry->delta_sibling = base_entry->delta_child;
1267 base_entry->delta_child = entry;
5c49c116
NP
1268 unuse_pack(&w_curs);
1269 return;
1270 }
ab7cd7bb 1271
5c49c116
NP
1272 if (entry->type) {
1273 /*
1274 * This must be a delta and we already know what the
1275 * final object type is. Let's extract the actual
1276 * object size from the delta header.
1277 */
1278 entry->size = get_size_from_delta(p, &w_curs,
1279 entry->in_pack_offset + entry->in_pack_header_size);
03d66015
NP
1280 if (entry->size == 0)
1281 goto give_up;
5c49c116 1282 unuse_pack(&w_curs);
3f9ac8d2
JH
1283 return;
1284 }
5c49c116
NP
1285
1286 /*
1287 * No choice but to fall back to the recursive delta walk
1288 * with sha1_object_info() to find about the object type
1289 * at this point...
1290 */
03d66015 1291 give_up:
5c49c116 1292 unuse_pack(&w_curs);
36e4d74a 1293 }
3f9ac8d2 1294
aa7e44bf 1295 entry->type = sha1_object_info(entry->idx.sha1, &entry->size);
6d6f9cdd
SP
1296 /*
1297 * The error condition is checked in prepare_pack(). This is
1298 * to permit a missing preferred base object to be ignored
1299 * as a preferred base. Doing so can result in a larger
1300 * pack file, but the transfer will still take place.
1301 */
3f9ac8d2
JH
1302}
1303
5c49c116
NP
1304static int pack_offset_sort(const void *_a, const void *_b)
1305{
1306 const struct object_entry *a = *(struct object_entry **)_a;
1307 const struct object_entry *b = *(struct object_entry **)_b;
1308
1309 /* avoid filesystem trashing with loose objects */
1310 if (!a->in_pack && !b->in_pack)
aa7e44bf 1311 return hashcmp(a->idx.sha1, b->idx.sha1);
5c49c116
NP
1312
1313 if (a->in_pack < b->in_pack)
1314 return -1;
1315 if (a->in_pack > b->in_pack)
1316 return 1;
1317 return a->in_pack_offset < b->in_pack_offset ? -1 :
1318 (a->in_pack_offset > b->in_pack_offset);
1319}
1320
c323ac7d
LT
1321static void get_object_details(void)
1322{
7cadf491 1323 uint32_t i;
5c49c116
NP
1324 struct object_entry **sorted_by_offset;
1325
1326 sorted_by_offset = xcalloc(nr_objects, sizeof(struct object_entry *));
1327 for (i = 0; i < nr_objects; i++)
1328 sorted_by_offset[i] = objects + i;
1329 qsort(sorted_by_offset, nr_objects, sizeof(*sorted_by_offset), pack_offset_sort);
c323ac7d 1330
15366280
JH
1331 for (i = 0; i < nr_objects; i++) {
1332 struct object_entry *entry = sorted_by_offset[i];
1333 check_object(entry);
1334 if (big_file_threshold <= entry->size)
1335 entry->no_try_delta = 1;
1336 }
3449f8c4 1337
5c49c116 1338 free(sorted_by_offset);
c323ac7d
LT
1339}
1340
b904166c
NP
1341/*
1342 * We search for deltas in a list sorted by type, by filename hash, and then
1343 * by size, so that we see progressively smaller and smaller files.
1344 * That's because we prefer deltas to be from the bigger file
1345 * to the smaller -- deletes are potentially cheaper, but perhaps
1346 * more importantly, the bigger file is likely the more recent
1347 * one. The deepest deltas are therefore the oldest objects which are
1348 * less susceptible to be accessed often.
1349 */
9668cf59 1350static int type_size_sort(const void *_a, const void *_b)
c323ac7d 1351{
9668cf59
NP
1352 const struct object_entry *a = *(struct object_entry **)_a;
1353 const struct object_entry *b = *(struct object_entry **)_b;
1354
c323ac7d 1355 if (a->type > b->type)
27225f2e 1356 return -1;
b904166c 1357 if (a->type < b->type)
27225f2e 1358 return 1;
b904166c 1359 if (a->hash > b->hash)
7a979d99 1360 return -1;
b904166c 1361 if (a->hash < b->hash)
7a979d99 1362 return 1;
b904166c 1363 if (a->preferred_base > b->preferred_base)
c323ac7d 1364 return -1;
b904166c
NP
1365 if (a->preferred_base < b->preferred_base)
1366 return 1;
c323ac7d 1367 if (a->size > b->size)
b904166c
NP
1368 return -1;
1369 if (a->size < b->size)
c323ac7d 1370 return 1;
b904166c 1371 return a < b ? -1 : (a > b); /* newest first */
c323ac7d
LT
1372}
1373
1374struct unpacked {
1375 struct object_entry *entry;
1376 void *data;
f6c7081a 1377 struct delta_index *index;
5a235b5e 1378 unsigned depth;
c323ac7d
LT
1379};
1380
d250626c
NP
1381static int delta_cacheable(unsigned long src_size, unsigned long trg_size,
1382 unsigned long delta_size)
074b2eea
MK
1383{
1384 if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size)
1385 return 0;
1386
e3dfddb3
MK
1387 if (delta_size < cache_max_small_delta_size)
1388 return 1;
1389
074b2eea
MK
1390 /* cache delta, if objects are large enough compared to delta size */
1391 if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10))
1392 return 1;
1393
1394 return 0;
1395}
1396
7eb151d6 1397#ifndef NO_PTHREADS
8ecce684 1398
44626dc7 1399static pthread_mutex_t read_mutex;
8ecce684
NP
1400#define read_lock() pthread_mutex_lock(&read_mutex)
1401#define read_unlock() pthread_mutex_unlock(&read_mutex)
1402
44626dc7 1403static pthread_mutex_t cache_mutex;
3c701839
NP
1404#define cache_lock() pthread_mutex_lock(&cache_mutex)
1405#define cache_unlock() pthread_mutex_unlock(&cache_mutex)
1406
44626dc7 1407static pthread_mutex_t progress_mutex;
8ecce684
NP
1408#define progress_lock() pthread_mutex_lock(&progress_mutex)
1409#define progress_unlock() pthread_mutex_unlock(&progress_mutex)
1410
1411#else
1412
e1ef8673
JH
1413#define read_lock() (void)0
1414#define read_unlock() (void)0
1415#define cache_lock() (void)0
1416#define cache_unlock() (void)0
1417#define progress_lock() (void)0
1418#define progress_unlock() (void)0
8ecce684
NP
1419
1420#endif
1421
f6c7081a 1422static int try_delta(struct unpacked *trg, struct unpacked *src,
ef0316fc 1423 unsigned max_depth, unsigned long *mem_usage)
c323ac7d 1424{
f6c7081a
NP
1425 struct object_entry *trg_entry = trg->entry;
1426 struct object_entry *src_entry = src->entry;
560b25a8 1427 unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
c83f032e 1428 unsigned ref_depth;
21666f1a 1429 enum object_type type;
c323ac7d
LT
1430 void *delta_buf;
1431
1432 /* Don't bother doing diffs between different types */
f6c7081a 1433 if (trg_entry->type != src_entry->type)
c323ac7d
LT
1434 return -1;
1435
51d1e83f 1436 /*
15f07e06
JK
1437 * We do not bother to try a delta that we discarded on an
1438 * earlier try, but only when reusing delta data. Note that
1439 * src_entry that is marked as the preferred_base should always
1440 * be considered, as even if we produce a suboptimal delta against
1441 * it, we will still save the transfer cost, as we already know
1442 * the other side has it and we won't send src_entry at all.
51d1e83f 1443 */
a7de7130 1444 if (reuse_delta && trg_entry->in_pack &&
e9195b58 1445 trg_entry->in_pack == src_entry->in_pack &&
15f07e06 1446 !src_entry->preferred_base &&
e9195b58
JH
1447 trg_entry->in_pack_type != OBJ_REF_DELTA &&
1448 trg_entry->in_pack_type != OBJ_OFS_DELTA)
51d1e83f
LT
1449 return 0;
1450
898b14ce 1451 /* Let's not bust the allowed depth. */
5a235b5e 1452 if (src->depth >= max_depth)
d116a45a 1453 return 0;
c323ac7d 1454
c3b06a69 1455 /* Now some size filtering heuristics. */
560b25a8 1456 trg_size = trg_entry->size;
c83f032e
NP
1457 if (!trg_entry->delta) {
1458 max_size = trg_size/2 - 20;
1459 ref_depth = 1;
1460 } else {
1461 max_size = trg_entry->delta_size;
5a235b5e 1462 ref_depth = trg->depth;
c83f032e 1463 }
720fe22d 1464 max_size = (uint64_t)max_size * (max_depth - src->depth) /
c83f032e 1465 (max_depth - ref_depth + 1);
c3b06a69
NP
1466 if (max_size == 0)
1467 return 0;
f6c7081a 1468 src_size = src_entry->size;
560b25a8 1469 sizediff = src_size < trg_size ? trg_size - src_size : 0;
27225f2e 1470 if (sizediff >= max_size)
f527cb8c 1471 return 0;
a1dab41a
BD
1472 if (trg_size < src_size / 32)
1473 return 0;
f6c7081a 1474
560b25a8
NP
1475 /* Load data if not already done */
1476 if (!trg->data) {
8ecce684 1477 read_lock();
aa7e44bf 1478 trg->data = read_sha1_file(trg_entry->idx.sha1, &type, &sz);
8ecce684 1479 read_unlock();
2e3404c3
JH
1480 if (!trg->data)
1481 die("object %s cannot be read",
1482 sha1_to_hex(trg_entry->idx.sha1));
560b25a8
NP
1483 if (sz != trg_size)
1484 die("object %s inconsistent object length (%lu vs %lu)",
aa7e44bf 1485 sha1_to_hex(trg_entry->idx.sha1), sz, trg_size);
ef0316fc 1486 *mem_usage += sz;
560b25a8
NP
1487 }
1488 if (!src->data) {
8ecce684 1489 read_lock();
aa7e44bf 1490 src->data = read_sha1_file(src_entry->idx.sha1, &type, &sz);
8ecce684 1491 read_unlock();
71064a95
NP
1492 if (!src->data) {
1493 if (src_entry->preferred_base) {
1494 static int warned = 0;
1495 if (!warned++)
1496 warning("object %s cannot be read",
1497 sha1_to_hex(src_entry->idx.sha1));
1498 /*
1499 * Those objects are not included in the
1500 * resulting pack. Be resilient and ignore
1501 * them if they can't be read, in case the
1502 * pack could be created nevertheless.
1503 */
1504 return 0;
1505 }
2e3404c3
JH
1506 die("object %s cannot be read",
1507 sha1_to_hex(src_entry->idx.sha1));
71064a95 1508 }
560b25a8
NP
1509 if (sz != src_size)
1510 die("object %s inconsistent object length (%lu vs %lu)",
aa7e44bf 1511 sha1_to_hex(src_entry->idx.sha1), sz, src_size);
ef0316fc 1512 *mem_usage += sz;
560b25a8
NP
1513 }
1514 if (!src->index) {
1515 src->index = create_delta_index(src->data, src_size);
a588d88a
MK
1516 if (!src->index) {
1517 static int warned = 0;
1518 if (!warned++)
1519 warning("suboptimal pack - out of memory");
1520 return 0;
1521 }
ef0316fc 1522 *mem_usage += sizeof_delta_index(src->index);
560b25a8
NP
1523 }
1524
1525 delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
c323ac7d 1526 if (!delta_buf)
75c42d8c 1527 return 0;
f6c7081a 1528
9e2d57a0 1529 if (trg_entry->delta) {
848d732c
BD
1530 /* Prefer only shallower same-sized deltas. */
1531 if (delta_size == trg_entry->delta_size &&
5a235b5e 1532 src->depth + 1 >= trg->depth) {
848d732c
BD
1533 free(delta_buf);
1534 return 0;
1535 }
074b2eea 1536 }
9e2d57a0 1537
3c701839
NP
1538 /*
1539 * Handle memory allocation outside of the cache
1540 * accounting lock. Compiler will optimize the strangeness
7eb151d6 1541 * away when NO_PTHREADS is defined.
3c701839 1542 */
8e0f7003 1543 free(trg_entry->delta_data);
3c701839 1544 cache_lock();
9e2d57a0
NP
1545 if (trg_entry->delta_data) {
1546 delta_cache_size -= trg_entry->delta_size;
9e2d57a0
NP
1547 trg_entry->delta_data = NULL;
1548 }
d250626c 1549 if (delta_cacheable(src_size, trg_size, delta_size)) {
b7a28f78 1550 delta_cache_size += delta_size;
3c701839
NP
1551 cache_unlock();
1552 trg_entry->delta_data = xrealloc(delta_buf, delta_size);
1553 } else {
1554 cache_unlock();
074b2eea 1555 free(delta_buf);
3c701839
NP
1556 }
1557
b7a28f78
NP
1558 trg_entry->delta = src_entry;
1559 trg_entry->delta_size = delta_size;
1560 trg->depth = src->depth + 1;
1561
f6c7081a 1562 return 1;
c323ac7d
LT
1563}
1564
898b14ce 1565static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
b2504a0d 1566{
898b14ce
NP
1567 struct object_entry *child = me->delta_child;
1568 unsigned int m = n;
1569 while (child) {
1570 unsigned int c = check_delta_limit(child, n + 1);
1571 if (m < c)
1572 m = c;
1573 child = child->delta_sibling;
1574 }
1575 return m;
b2504a0d
NP
1576}
1577
75ad235c 1578static unsigned long free_unpacked(struct unpacked *n)
a97773ce 1579{
ef0316fc 1580 unsigned long freed_mem = sizeof_delta_index(n->index);
a97773ce
BD
1581 free_delta_index(n->index);
1582 n->index = NULL;
1583 if (n->data) {
ef0316fc 1584 freed_mem += n->entry->size;
a97773ce
BD
1585 free(n->data);
1586 n->data = NULL;
a97773ce
BD
1587 }
1588 n->entry = NULL;
7d7baa5e 1589 n->depth = 0;
ef0316fc 1590 return freed_mem;
a97773ce
BD
1591}
1592
384b32c0 1593static void find_deltas(struct object_entry **list, unsigned *list_size,
e334977d 1594 int window, int depth, unsigned *processed)
c323ac7d 1595{
384b32c0 1596 uint32_t i, idx = 0, count = 0;
7cadf491 1597 struct unpacked *array;
ef0316fc 1598 unsigned long mem_usage = 0;
c323ac7d 1599
19d4b416 1600 array = xcalloc(window, sizeof(struct unpacked));
21fcd1bd 1601
384b32c0 1602 for (;;) {
421b488a 1603 struct object_entry *entry;
c323ac7d 1604 struct unpacked *n = array + idx;
ef0316fc 1605 int j, max_depth, best_base = -1;
c323ac7d 1606
384b32c0
NP
1607 progress_lock();
1608 if (!*list_size) {
1609 progress_unlock();
1610 break;
1611 }
421b488a 1612 entry = *list++;
384b32c0
NP
1613 (*list_size)--;
1614 if (!entry->preferred_base) {
1615 (*processed)++;
1616 display_progress(progress_state, *processed);
1617 }
1618 progress_unlock();
1619
ef0316fc 1620 mem_usage -= free_unpacked(n);
c323ac7d 1621 n->entry = entry;
ab7cd7bb 1622
a97773ce 1623 while (window_memory_limit &&
ef0316fc 1624 mem_usage > window_memory_limit &&
a97773ce
BD
1625 count > 1) {
1626 uint32_t tail = (idx + window - count) % window;
75ad235c 1627 mem_usage -= free_unpacked(array + tail);
a97773ce
BD
1628 count--;
1629 }
1630
75d39853
NP
1631 /* We do not compute delta to *create* objects we are not
1632 * going to pack.
1633 */
1634 if (entry->preferred_base)
1635 goto next;
1636
898b14ce
NP
1637 /*
1638 * If the current object is at pack edge, take the depth the
1639 * objects that depend on the current object into account
1640 * otherwise they would become too deep.
1641 */
1642 max_depth = depth;
1643 if (entry->delta_child) {
1644 max_depth -= check_delta_limit(entry, 0);
1645 if (max_depth <= 0)
1646 goto next;
1647 }
1648
78817c15
LT
1649 j = window;
1650 while (--j > 0) {
77639870 1651 int ret;
7cadf491 1652 uint32_t other_idx = idx + j;
c323ac7d 1653 struct unpacked *m;
78817c15
LT
1654 if (other_idx >= window)
1655 other_idx -= window;
c323ac7d
LT
1656 m = array + other_idx;
1657 if (!m->entry)
1658 break;
ef0316fc 1659 ret = try_delta(n, m, max_depth, &mem_usage);
77639870 1660 if (ret < 0)
c323ac7d 1661 break;
77639870
JH
1662 else if (ret > 0)
1663 best_base = other_idx;
c323ac7d 1664 }
898b14ce 1665
ed4a9031
NP
1666 /*
1667 * If we decided to cache the delta data, then it is best
1668 * to compress it right away. First because we have to do
1669 * it anyway, and doing it here while we're threaded will
1670 * save a lot of time in the non threaded write phase,
1671 * as well as allow for caching more deltas within
1672 * the same cache size limit.
1673 * ...
1674 * But only if not writing to stdout, since in that case
1675 * the network is most likely throttling writes anyway,
1676 * and therefore it is best to go to the write phase ASAP
1677 * instead, as we can afford spending more time compressing
1678 * between writes at that moment.
1679 */
1680 if (entry->delta_data && !pack_to_stdout) {
1681 entry->z_delta_size = do_compress(&entry->delta_data,
1682 entry->delta_size);
1683 cache_lock();
1684 delta_cache_size -= entry->delta_size;
1685 delta_cache_size += entry->z_delta_size;
1686 cache_unlock();
1687 }
1688
70ca1a3f
JH
1689 /* if we made n a delta, and if n is already at max
1690 * depth, leaving it in the window is pointless. we
1691 * should evict it first.
70ca1a3f 1692 */
70baf5d4 1693 if (entry->delta && max_depth <= n->depth)
70ca1a3f 1694 continue;
ff45715c 1695
77639870
JH
1696 /*
1697 * Move the best delta base up in the window, after the
1698 * currently deltified object, to keep it longer. It will
1699 * be the first base object to be attempted next.
1700 */
1701 if (entry->delta) {
1702 struct unpacked swap = array[best_base];
1703 int dist = (window + idx - best_base) % window;
1704 int dst = best_base;
1705 while (dist--) {
1706 int src = (dst + 1) % window;
1707 array[dst] = array[src];
1708 dst = src;
1709 }
1710 array[dst] = swap;
1711 }
1712
898b14ce 1713 next:
521a4f4c 1714 idx++;
a97773ce
BD
1715 if (count + 1 < window)
1716 count++;
521a4f4c
LT
1717 if (idx >= window)
1718 idx = 0;
384b32c0 1719 }
adee7bdf 1720
f6c7081a 1721 for (i = 0; i < window; ++i) {
ff45715c 1722 free_delta_index(array[i].index);
adee7bdf 1723 free(array[i].data);
f6c7081a 1724 }
adee7bdf 1725 free(array);
c323ac7d
LT
1726}
1727
7eb151d6 1728#ifndef NO_PTHREADS
8ecce684 1729
a9a74636
NP
1730static void try_to_free_from_threads(size_t size)
1731{
1732 read_lock();
1733 release_pack_memory(size, -1);
1734 read_unlock();
1735}
1736
bc9b2175 1737static try_to_free_t old_try_to_free_routine;
851c34b0 1738
50f22ada
JS
1739/*
1740 * The main thread waits on the condition that (at least) one of the workers
1741 * has stopped working (which is indicated in the .working member of
1742 * struct thread_params).
1743 * When a work thread has completed its work, it sets .working to 0 and
1744 * signals the main thread and waits on the condition that .data_ready
1745 * becomes 1.
1746 */
1747
8ecce684
NP
1748struct thread_params {
1749 pthread_t thread;
1750 struct object_entry **list;
1751 unsigned list_size;
384b32c0 1752 unsigned remaining;
8ecce684
NP
1753 int window;
1754 int depth;
50f22ada
JS
1755 int working;
1756 int data_ready;
1757 pthread_mutex_t mutex;
1758 pthread_cond_t cond;
8ecce684
NP
1759 unsigned *processed;
1760};
1761
44626dc7
AH
1762static pthread_cond_t progress_cond;
1763
1764/*
1765 * Mutex and conditional variable can't be statically-initialized on Windows.
1766 */
1767static void init_threaded_search(void)
1768{
93749194 1769 init_recursive_mutex(&read_mutex);
44626dc7
AH
1770 pthread_mutex_init(&cache_mutex, NULL);
1771 pthread_mutex_init(&progress_mutex, NULL);
1772 pthread_cond_init(&progress_cond, NULL);
851c34b0 1773 old_try_to_free_routine = set_try_to_free_routine(try_to_free_from_threads);
44626dc7
AH
1774}
1775
1776static void cleanup_threaded_search(void)
1777{
851c34b0 1778 set_try_to_free_routine(old_try_to_free_routine);
44626dc7
AH
1779 pthread_cond_destroy(&progress_cond);
1780 pthread_mutex_destroy(&read_mutex);
1781 pthread_mutex_destroy(&cache_mutex);
1782 pthread_mutex_destroy(&progress_mutex);
1783}
c2a33679 1784
8ecce684
NP
1785static void *threaded_find_deltas(void *arg)
1786{
c2a33679
NP
1787 struct thread_params *me = arg;
1788
50f22ada 1789 while (me->remaining) {
384b32c0 1790 find_deltas(me->list, &me->remaining,
c2a33679 1791 me->window, me->depth, me->processed);
50f22ada
JS
1792
1793 progress_lock();
1794 me->working = 0;
1795 pthread_cond_signal(&progress_cond);
1796 progress_unlock();
1797
1798 /*
1799 * We must not set ->data_ready before we wait on the
1800 * condition because the main thread may have set it to 1
1801 * before we get here. In order to be sure that new
1802 * work is available if we see 1 in ->data_ready, it
1803 * was initialized to 0 before this thread was spawned
1804 * and we reset it to 0 right away.
1805 */
1806 pthread_mutex_lock(&me->mutex);
1807 while (!me->data_ready)
1808 pthread_cond_wait(&me->cond, &me->mutex);
1809 me->data_ready = 0;
1810 pthread_mutex_unlock(&me->mutex);
c2a33679 1811 }
50f22ada
JS
1812 /* leave ->working 1 so that this doesn't get more work assigned */
1813 return NULL;
8ecce684
NP
1814}
1815
8ecce684
NP
1816static void ll_find_deltas(struct object_entry **list, unsigned list_size,
1817 int window, int depth, unsigned *processed)
1818{
dcda3614 1819 struct thread_params *p;
384b32c0 1820 int i, ret, active_threads = 0;
c2a33679 1821
44626dc7
AH
1822 init_threaded_search();
1823
ef055571
NP
1824 if (!delta_search_threads) /* --threads=0 means autodetect */
1825 delta_search_threads = online_cpus();
367f4a43 1826 if (delta_search_threads <= 1) {
384b32c0 1827 find_deltas(list, &list_size, window, depth, processed);
44626dc7 1828 cleanup_threaded_search();
367f4a43
NP
1829 return;
1830 }
43cc2b42 1831 if (progress > pack_to_stdout)
b6c29915 1832 fprintf(stderr, "Delta compression using up to %d threads.\n",
43cc2b42 1833 delta_search_threads);
dcda3614 1834 p = xcalloc(delta_search_threads, sizeof(*p));
367f4a43 1835
50f22ada 1836 /* Partition the work amongst work threads. */
367f4a43 1837 for (i = 0; i < delta_search_threads; i++) {
50f22ada
JS
1838 unsigned sub_size = list_size / (delta_search_threads - i);
1839
bf874896
NP
1840 /* don't use too small segments or no deltas will be found */
1841 if (sub_size < 2*window && i+1 < delta_search_threads)
1842 sub_size = 0;
1843
8ecce684
NP
1844 p[i].window = window;
1845 p[i].depth = depth;
1846 p[i].processed = processed;
50f22ada
JS
1847 p[i].working = 1;
1848 p[i].data_ready = 0;
c2a33679 1849
59921b4b 1850 /* try to split chunks on "path" boundaries */
6fc74703
NP
1851 while (sub_size && sub_size < list_size &&
1852 list[sub_size]->hash &&
384b32c0
NP
1853 list[sub_size]->hash == list[sub_size-1]->hash)
1854 sub_size++;
1855
50f22ada
JS
1856 p[i].list = list;
1857 p[i].list_size = sub_size;
1858 p[i].remaining = sub_size;
59921b4b 1859
384b32c0
NP
1860 list += sub_size;
1861 list_size -= sub_size;
1862 }
1863
50f22ada
JS
1864 /* Start work threads. */
1865 for (i = 0; i < delta_search_threads; i++) {
1866 if (!p[i].list_size)
1867 continue;
68e6a4f8
JS
1868 pthread_mutex_init(&p[i].mutex, NULL);
1869 pthread_cond_init(&p[i].cond, NULL);
50f22ada
JS
1870 ret = pthread_create(&p[i].thread, NULL,
1871 threaded_find_deltas, &p[i]);
1872 if (ret)
1873 die("unable to create thread: %s", strerror(ret));
1874 active_threads++;
1875 }
1876
384b32c0
NP
1877 /*
1878 * Now let's wait for work completion. Each time a thread is done
1879 * with its work, we steal half of the remaining work from the
1880 * thread with the largest number of unprocessed objects and give
1881 * it to that newly idle thread. This ensure good load balancing
1882 * until the remaining object list segments are simply too short
1883 * to be worth splitting anymore.
1884 */
50f22ada
JS
1885 while (active_threads) {
1886 struct thread_params *target = NULL;
384b32c0
NP
1887 struct thread_params *victim = NULL;
1888 unsigned sub_size = 0;
384b32c0
NP
1889
1890 progress_lock();
50f22ada
JS
1891 for (;;) {
1892 for (i = 0; !target && i < delta_search_threads; i++)
1893 if (!p[i].working)
1894 target = &p[i];
1895 if (target)
1896 break;
1897 pthread_cond_wait(&progress_cond, &progress_mutex);
1898 }
1899
384b32c0
NP
1900 for (i = 0; i < delta_search_threads; i++)
1901 if (p[i].remaining > 2*window &&
1902 (!victim || victim->remaining < p[i].remaining))
1903 victim = &p[i];
1904 if (victim) {
1905 sub_size = victim->remaining / 2;
1906 list = victim->list + victim->list_size - sub_size;
1907 while (sub_size && list[0]->hash &&
1908 list[0]->hash == list[-1]->hash) {
1909 list++;
1910 sub_size--;
1911 }
eb9688ff
NP
1912 if (!sub_size) {
1913 /*
1914 * It is possible for some "paths" to have
1915 * so many objects that no hash boundary
1916 * might be found. Let's just steal the
1917 * exact half in that case.
1918 */
1919 sub_size = victim->remaining / 2;
1920 list -= sub_size;
1921 }
384b32c0
NP
1922 target->list = list;
1923 victim->list_size -= sub_size;
1924 victim->remaining -= sub_size;
1925 }
384b32c0
NP
1926 target->list_size = sub_size;
1927 target->remaining = sub_size;
50f22ada
JS
1928 target->working = 1;
1929 progress_unlock();
1930
1931 pthread_mutex_lock(&target->mutex);
1932 target->data_ready = 1;
1933 pthread_cond_signal(&target->cond);
1934 pthread_mutex_unlock(&target->mutex);
c2a33679 1935
384b32c0 1936 if (!sub_size) {
b81d9af7 1937 pthread_join(target->thread, NULL);
50f22ada
JS
1938 pthread_cond_destroy(&target->cond);
1939 pthread_mutex_destroy(&target->mutex);
384b32c0 1940 active_threads--;
c2a33679 1941 }
50f22ada 1942 }
44626dc7 1943 cleanup_threaded_search();
dcda3614 1944 free(p);
8ecce684
NP
1945}
1946
1947#else
384b32c0 1948#define ll_find_deltas(l, s, w, d, p) find_deltas(l, &s, w, d, p)
8ecce684
NP
1949#endif
1950
f0a24aa5
SP
1951static int add_ref_tag(const char *path, const unsigned char *sha1, int flag, void *cb_data)
1952{
1953 unsigned char peeled[20];
1954
1955 if (!prefixcmp(path, "refs/tags/") && /* is a tag? */
1956 !peel_ref(path, peeled) && /* peelable? */
1957 !is_null_sha1(peeled) && /* annotated tag? */
1958 locate_object_entry(peeled)) /* object packed? */
1959 add_object_entry(sha1, OBJ_TAG, NULL, 0);
1960 return 0;
1961}
1962
f3123c4a
JH
1963static void prepare_pack(int window, int depth)
1964{
9668cf59 1965 struct object_entry **delta_list;
6e1c2344
RJ
1966 uint32_t i, nr_deltas;
1967 unsigned n;
9668cf59 1968
3f9ac8d2 1969 get_object_details();
9668cf59 1970
0e8189e2
NP
1971 /*
1972 * If we're locally repacking then we need to be doubly careful
1973 * from now on in order to make sure no stealth corruption gets
1974 * propagated to the new pack. Clients receiving streamed packs
1975 * should validate everything they get anyway so no need to incur
1976 * the additional cost here in that case.
1977 */
1978 if (!pack_to_stdout)
1979 do_check_packed_object_crc = 1;
1980
75d39853 1981 if (!nr_objects || !window || !depth)
9668cf59
NP
1982 return;
1983
1984 delta_list = xmalloc(nr_objects * sizeof(*delta_list));
75d39853
NP
1985 nr_deltas = n = 0;
1986
1987 for (i = 0; i < nr_objects; i++) {
1988 struct object_entry *entry = objects + i;
1989
1990 if (entry->delta)
1991 /* This happens if we decided to reuse existing
a7de7130 1992 * delta from a pack. "reuse_delta &&" is implied.
75d39853
NP
1993 */
1994 continue;
1995
1996 if (entry->size < 50)
1997 continue;
1998
1999 if (entry->no_try_delta)
2000 continue;
2001
6d6f9cdd 2002 if (!entry->preferred_base) {
75d39853 2003 nr_deltas++;
6d6f9cdd
SP
2004 if (entry->type < 0)
2005 die("unable to get type of object %s",
2006 sha1_to_hex(entry->idx.sha1));
eede9f42
NP
2007 } else {
2008 if (entry->type < 0) {
2009 /*
2010 * This object is not found, but we
2011 * don't have to include it anyway.
2012 */
2013 continue;
2014 }
6d6f9cdd 2015 }
75d39853
NP
2016
2017 delta_list[n++] = entry;
2018 }
2019
2f8b8947 2020 if (nr_deltas && n > 1) {
e334977d
NP
2021 unsigned nr_done = 0;
2022 if (progress)
dc6a0757
NP
2023 progress_state = start_progress("Compressing objects",
2024 nr_deltas);
75d39853 2025 qsort(delta_list, n, sizeof(*delta_list), type_size_sort);
8ecce684 2026 ll_find_deltas(delta_list, n, window+1, depth, &nr_done);
4d4fcc54 2027 stop_progress(&progress_state);
e334977d
NP
2028 if (nr_done != nr_deltas)
2029 die("inconsistency with delta count");
75d39853 2030 }
9668cf59 2031 free(delta_list);
f3123c4a
JH
2032}
2033
ef90d6d4 2034static int git_pack_config(const char *k, const char *v, void *cb)
4812a93a 2035{
eeefa7c9 2036 if (!strcmp(k, "pack.window")) {
4812a93a
JK
2037 window = git_config_int(k, v);
2038 return 0;
2039 }
a97773ce
BD
2040 if (!strcmp(k, "pack.windowmemory")) {
2041 window_memory_limit = git_config_ulong(k, v);
2042 return 0;
2043 }
2044 if (!strcmp(k, "pack.depth")) {
842aaf93
TT
2045 depth = git_config_int(k, v);
2046 return 0;
2047 }
960ccca6
DH
2048 if (!strcmp(k, "pack.compression")) {
2049 int level = git_config_int(k, v);
2050 if (level == -1)
2051 level = Z_DEFAULT_COMPRESSION;
2052 else if (level < 0 || level > Z_BEST_COMPRESSION)
2053 die("bad pack compression level %d", level);
2054 pack_compression_level = level;
2055 pack_compression_seen = 1;
2056 return 0;
2057 }
074b2eea
MK
2058 if (!strcmp(k, "pack.deltacachesize")) {
2059 max_delta_cache_size = git_config_int(k, v);
2060 return 0;
2061 }
e3dfddb3
MK
2062 if (!strcmp(k, "pack.deltacachelimit")) {
2063 cache_max_small_delta_size = git_config_int(k, v);
2064 return 0;
2065 }
693b86ff
NP
2066 if (!strcmp(k, "pack.threads")) {
2067 delta_search_threads = git_config_int(k, v);
833e3df1 2068 if (delta_search_threads < 0)
693b86ff
NP
2069 die("invalid number of threads specified (%d)",
2070 delta_search_threads);
7eb151d6 2071#ifdef NO_PTHREADS
833e3df1 2072 if (delta_search_threads != 1)
693b86ff
NP
2073 warning("no threads support, ignoring %s", k);
2074#endif
2075 return 0;
2076 }
4d00bda2 2077 if (!strcmp(k, "pack.indexversion")) {
ebcfb379
JH
2078 pack_idx_opts.version = git_config_int(k, v);
2079 if (pack_idx_opts.version > 2)
6e1c2344 2080 die("bad pack.indexversion=%"PRIu32,
ebcfb379 2081 pack_idx_opts.version);
4d00bda2
NP
2082 return 0;
2083 }
ef90d6d4 2084 return git_default_config(k, v, cb);
4812a93a
JK
2085}
2086
b5d97e6b 2087static void read_object_list_from_stdin(void)
c323ac7d 2088{
b5d97e6b
JH
2089 char line[40 + 1 + PATH_MAX + 2];
2090 unsigned char sha1[20];
b2504a0d 2091
da93d12b 2092 for (;;) {
da93d12b
LT
2093 if (!fgets(line, sizeof(line), stdin)) {
2094 if (feof(stdin))
2095 break;
2096 if (!ferror(stdin))
2097 die("fgets returned NULL, not EOF, not error!");
687dd75c 2098 if (errno != EINTR)
d824cbba 2099 die_errno("fgets");
687dd75c
JH
2100 clearerr(stdin);
2101 continue;
da93d12b 2102 }
7a979d99
JH
2103 if (line[0] == '-') {
2104 if (get_sha1_hex(line+1, sha1))
2105 die("expected edge sha1, got garbage:\n %s",
b5d97e6b 2106 line);
8d1d8f83 2107 add_preferred_base(sha1);
7a979d99 2108 continue;
21fcd1bd 2109 }
c323ac7d 2110 if (get_sha1_hex(line, sha1))
ef07618f 2111 die("expected sha1, got garbage:\n %s", line);
b5d97e6b 2112
bc32fed5
JH
2113 add_preferred_base_object(line+41);
2114 add_object_entry(sha1, 0, line+41, 0);
c323ac7d 2115 }
b5d97e6b
JH
2116}
2117
08cdfb13
JH
2118#define OBJECT_ADDED (1u<<20)
2119
11c211fa 2120static void show_commit(struct commit *commit, void *data)
b5d97e6b 2121{
bc32fed5 2122 add_object_entry(commit->object.sha1, OBJ_COMMIT, NULL, 0);
08cdfb13 2123 commit->object.flags |= OBJECT_ADDED;
b5d97e6b
JH
2124}
2125
49473672
JH
2126static void show_object(struct object *obj,
2127 const struct name_path *path, const char *last,
2128 void *data)
b5d97e6b 2129{
cf2ab916
LT
2130 char *name = path_name(path, last);
2131
8d2dfc49
LT
2132 add_preferred_base_object(name);
2133 add_object_entry(obj->sha1, obj->type, name, 0);
2134 obj->flags |= OBJECT_ADDED;
2135
2136 /*
2137 * We will have generated the hash from the name,
2138 * but not saved a pointer to it - we can free it
2139 */
2140 free((char *)name);
b5d97e6b
JH
2141}
2142
8d1d8f83
JH
2143static void show_edge(struct commit *commit)
2144{
2145 add_preferred_base(commit->object.sha1);
2146}
2147
08cdfb13
JH
2148struct in_pack_object {
2149 off_t offset;
2150 struct object *object;
2151};
2152
2153struct in_pack {
2154 int alloc;
2155 int nr;
2156 struct in_pack_object *array;
2157};
2158
2159static void mark_in_pack_object(struct object *object, struct packed_git *p, struct in_pack *in_pack)
2160{
2161 in_pack->array[in_pack->nr].offset = find_pack_entry_one(object->sha1, p);
2162 in_pack->array[in_pack->nr].object = object;
2163 in_pack->nr++;
2164}
2165
2166/*
2167 * Compare the objects in the offset order, in order to emulate the
f18d244a 2168 * "git rev-list --objects" output that produced the pack originally.
08cdfb13
JH
2169 */
2170static int ofscmp(const void *a_, const void *b_)
2171{
2172 struct in_pack_object *a = (struct in_pack_object *)a_;
2173 struct in_pack_object *b = (struct in_pack_object *)b_;
2174
2175 if (a->offset < b->offset)
2176 return -1;
2177 else if (a->offset > b->offset)
2178 return 1;
2179 else
2180 return hashcmp(a->object->sha1, b->object->sha1);
2181}
2182
2183static void add_objects_in_unpacked_packs(struct rev_info *revs)
2184{
2185 struct packed_git *p;
2186 struct in_pack in_pack;
2187 uint32_t i;
2188
2189 memset(&in_pack, 0, sizeof(in_pack));
2190
2191 for (p = packed_git; p; p = p->next) {
2192 const unsigned char *sha1;
2193 struct object *o;
2194
79bc4c71 2195 if (!p->pack_local || p->pack_keep)
08cdfb13
JH
2196 continue;
2197 if (open_pack_index(p))
2198 die("cannot open pack index");
2199
2200 ALLOC_GROW(in_pack.array,
2201 in_pack.nr + p->num_objects,
2202 in_pack.alloc);
2203
2204 for (i = 0; i < p->num_objects; i++) {
2205 sha1 = nth_packed_object_sha1(p, i);
2206 o = lookup_unknown_object(sha1);
2207 if (!(o->flags & OBJECT_ADDED))
2208 mark_in_pack_object(o, p, &in_pack);
2209 o->flags |= OBJECT_ADDED;
2210 }
2211 }
2212
2213 if (in_pack.nr) {
2214 qsort(in_pack.array, in_pack.nr, sizeof(in_pack.array[0]),
2215 ofscmp);
2216 for (i = 0; i < in_pack.nr; i++) {
2217 struct object *o = in_pack.array[i].object;
2218 add_object_entry(o->sha1, o->type, "", 0);
2219 }
2220 }
2221 free(in_pack.array);
2222}
2223
094085e3
BC
2224static int has_sha1_pack_kept_or_nonlocal(const unsigned char *sha1)
2225{
2226 static struct packed_git *last_found = (void *)1;
2227 struct packed_git *p;
2228
2229 p = (last_found != (void *)1) ? last_found : packed_git;
2230
2231 while (p) {
2232 if ((!p->pack_local || p->pack_keep) &&
2233 find_pack_entry_one(sha1, p)) {
2234 last_found = p;
2235 return 1;
2236 }
2237 if (p == last_found)
2238 p = packed_git;
2239 else
2240 p = p->next;
2241 if (p == last_found)
2242 p = p->next;
2243 }
2244 return 0;
2245}
2246
ca11b212
NP
2247static void loosen_unused_packed_objects(struct rev_info *revs)
2248{
2249 struct packed_git *p;
2250 uint32_t i;
2251 const unsigned char *sha1;
2252
2253 for (p = packed_git; p; p = p->next) {
79bc4c71 2254 if (!p->pack_local || p->pack_keep)
ca11b212
NP
2255 continue;
2256
2257 if (open_pack_index(p))
2258 die("cannot open pack index");
2259
2260 for (i = 0; i < p->num_objects; i++) {
2261 sha1 = nth_packed_object_sha1(p, i);
094085e3
BC
2262 if (!locate_object_entry(sha1) &&
2263 !has_sha1_pack_kept_or_nonlocal(sha1))
ca11b212
NP
2264 if (force_object_loose(sha1, p->mtime))
2265 die("unable to force loose object");
2266 }
2267 }
2268}
2269
8d1d8f83 2270static void get_object_list(int ac, const char **av)
b5d97e6b
JH
2271{
2272 struct rev_info revs;
2273 char line[1000];
b5d97e6b
JH
2274 int flags = 0;
2275
b5d97e6b
JH
2276 init_revisions(&revs, NULL);
2277 save_commit_buffer = 0;
b5d97e6b
JH
2278 setup_revisions(ac, av, &revs, NULL);
2279
b5d97e6b
JH
2280 while (fgets(line, sizeof(line), stdin) != NULL) {
2281 int len = strlen(line);
872c930d 2282 if (len && line[len - 1] == '\n')
b5d97e6b
JH
2283 line[--len] = 0;
2284 if (!len)
2285 break;
2286 if (*line == '-') {
2287 if (!strcmp(line, "--not")) {
2288 flags ^= UNINTERESTING;
2289 continue;
2290 }
2291 die("not a rev '%s'", line);
2292 }
2293 if (handle_revision_arg(line, &revs, flags, 1))
2294 die("bad revision '%s'", line);
2295 }
2296
3d51e1b5
MK
2297 if (prepare_revision_walk(&revs))
2298 die("revision walk setup failed");
8d1d8f83 2299 mark_edges_uninteresting(revs.commits, &revs, show_edge);
11c211fa 2300 traverse_commit_list(&revs, show_commit, show_object, NULL);
08cdfb13
JH
2301
2302 if (keep_unreachable)
2303 add_objects_in_unpacked_packs(&revs);
ca11b212
NP
2304 if (unpack_unreachable)
2305 loosen_unused_packed_objects(&revs);
b5d97e6b
JH
2306}
2307
2308int cmd_pack_objects(int argc, const char **argv, const char *prefix)
2309{
b5d97e6b 2310 int use_internal_rev_list = 0;
8d1d8f83 2311 int thin = 0;
4f366275 2312 int all_progress_implied = 0;
7cadf491 2313 uint32_t i;
ffa84ffb
RD
2314 const char **rp_av;
2315 int rp_ac_alloc = 64;
8d1d8f83
JH
2316 int rp_ac;
2317
dae556bd
CC
2318 read_replace_refs = 0;
2319
ffa84ffb
RD
2320 rp_av = xcalloc(rp_ac_alloc, sizeof(*rp_av));
2321
8d1d8f83
JH
2322 rp_av[0] = "pack-objects";
2323 rp_av[1] = "--objects"; /* --thin will make it --objects-edge */
2324 rp_ac = 2;
b5d97e6b 2325
ebcfb379 2326 reset_pack_idx_option(&pack_idx_opts);
ef90d6d4 2327 git_config(git_pack_config, NULL);
960ccca6
DH
2328 if (!pack_compression_seen && core_compression_seen)
2329 pack_compression_level = core_compression_level;
b5d97e6b
JH
2330
2331 progress = isatty(2);
2332 for (i = 1; i < argc; i++) {
2333 const char *arg = argv[i];
2334
2335 if (*arg != '-')
2336 break;
2337
2338 if (!strcmp("--non-empty", arg)) {
2339 non_empty = 1;
2340 continue;
2341 }
2342 if (!strcmp("--local", arg)) {
2343 local = 1;
2344 continue;
2345 }
b5d97e6b
JH
2346 if (!strcmp("--incremental", arg)) {
2347 incremental = 1;
2348 continue;
2349 }
e96fb9b8
BC
2350 if (!strcmp("--honor-pack-keep", arg)) {
2351 ignore_packed_keep = 1;
2352 continue;
2353 }
960ccca6
DH
2354 if (!prefixcmp(arg, "--compression=")) {
2355 char *end;
2356 int level = strtoul(arg+14, &end, 0);
2357 if (!arg[14] || *end)
2358 usage(pack_usage);
2359 if (level == -1)
2360 level = Z_DEFAULT_COMPRESSION;
2361 else if (level < 0 || level > Z_BEST_COMPRESSION)
2362 die("bad pack compression level %d", level);
2363 pack_compression_level = level;
2364 continue;
2365 }
6b94b1a0 2366 if (!prefixcmp(arg, "--max-pack-size=")) {
2b84b5a8 2367 pack_size_limit_cfg = 0;
07cf0f24 2368 if (!git_parse_ulong(arg+16, &pack_size_limit))
6b94b1a0
DH
2369 usage(pack_usage);
2370 continue;
2371 }
599065a3 2372 if (!prefixcmp(arg, "--window=")) {
b5d97e6b
JH
2373 char *end;
2374 window = strtoul(arg+9, &end, 0);
2375 if (!arg[9] || *end)
2376 usage(pack_usage);
2377 continue;
2378 }
a97773ce
BD
2379 if (!prefixcmp(arg, "--window-memory=")) {
2380 if (!git_parse_ulong(arg+16, &window_memory_limit))
2381 usage(pack_usage);
2382 continue;
2383 }
367f4a43
NP
2384 if (!prefixcmp(arg, "--threads=")) {
2385 char *end;
2386 delta_search_threads = strtoul(arg+10, &end, 0);
833e3df1 2387 if (!arg[10] || *end || delta_search_threads < 0)
367f4a43 2388 usage(pack_usage);
7eb151d6 2389#ifdef NO_PTHREADS
833e3df1 2390 if (delta_search_threads != 1)
367f4a43
NP
2391 warning("no threads support, "
2392 "ignoring %s", arg);
2393#endif
2394 continue;
2395 }
599065a3 2396 if (!prefixcmp(arg, "--depth=")) {
b5d97e6b
JH
2397 char *end;
2398 depth = strtoul(arg+8, &end, 0);
2399 if (!arg[8] || *end)
2400 usage(pack_usage);
2401 continue;
2402 }
2403 if (!strcmp("--progress", arg)) {
2404 progress = 1;
2405 continue;
2406 }
231f240b
NP
2407 if (!strcmp("--all-progress", arg)) {
2408 progress = 2;
2409 continue;
2410 }
4f366275
NP
2411 if (!strcmp("--all-progress-implied", arg)) {
2412 all_progress_implied = 1;
2413 continue;
2414 }
b5d97e6b
JH
2415 if (!strcmp("-q", arg)) {
2416 progress = 0;
2417 continue;
2418 }
2419 if (!strcmp("--no-reuse-delta", arg)) {
a7de7130 2420 reuse_delta = 0;
b5d97e6b
JH
2421 continue;
2422 }
fa736f72 2423 if (!strcmp("--no-reuse-object", arg)) {
a7de7130 2424 reuse_object = reuse_delta = 0;
fa736f72
NP
2425 continue;
2426 }
be6b1914 2427 if (!strcmp("--delta-base-offset", arg)) {
780e6e73 2428 allow_ofs_delta = 1;
be6b1914
NP
2429 continue;
2430 }
b5d97e6b
JH
2431 if (!strcmp("--stdout", arg)) {
2432 pack_to_stdout = 1;
2433 continue;
2434 }
2435 if (!strcmp("--revs", arg)) {
2436 use_internal_rev_list = 1;
2437 continue;
2438 }
08cdfb13
JH
2439 if (!strcmp("--keep-unreachable", arg)) {
2440 keep_unreachable = 1;
2441 continue;
2442 }
ca11b212
NP
2443 if (!strcmp("--unpack-unreachable", arg)) {
2444 unpack_unreachable = 1;
2445 continue;
2446 }
f0a24aa5
SP
2447 if (!strcmp("--include-tag", arg)) {
2448 include_tag = 1;
2449 continue;
2450 }
8d1d8f83 2451 if (!strcmp("--unpacked", arg) ||
63049292 2452 !strcmp("--reflog", arg) ||
8d1d8f83
JH
2453 !strcmp("--all", arg)) {
2454 use_internal_rev_list = 1;
ffa84ffb
RD
2455 if (rp_ac >= rp_ac_alloc - 1) {
2456 rp_ac_alloc = alloc_nr(rp_ac_alloc);
2457 rp_av = xrealloc(rp_av,
2458 rp_ac_alloc * sizeof(*rp_av));
2459 }
8d1d8f83 2460 rp_av[rp_ac++] = arg;
b5d97e6b
JH
2461 continue;
2462 }
8d1d8f83
JH
2463 if (!strcmp("--thin", arg)) {
2464 use_internal_rev_list = 1;
2465 thin = 1;
2466 rp_av[1] = "--objects-edge";
b5d97e6b 2467 continue;
4ba7d711
NP
2468 }
2469 if (!prefixcmp(arg, "--index-version=")) {
2470 char *c;
ebcfb379
JH
2471 pack_idx_opts.version = strtoul(arg + 16, &c, 10);
2472 if (pack_idx_opts.version > 2)
4ba7d711 2473 die("bad %s", arg);
6a301345 2474 if (*c == ',' && c[1])
ebcfb379
JH
2475 pack_idx_opts.off32_limit = strtoul(c+1, &c, 0);
2476 if (*c || pack_idx_opts.off32_limit & 0x80000000)
4ba7d711
NP
2477 die("bad %s", arg);
2478 continue;
b5d97e6b 2479 }
7f3140cd
JS
2480 if (!strcmp(arg, "--keep-true-parents")) {
2481 grafts_replace_parents = 0;
2482 continue;
2483 }
b5d97e6b
JH
2484 usage(pack_usage);
2485 }
2486
b5d97e6b
JH
2487 if (!pack_to_stdout)
2488 base_name = argv[i++];
2489
3a2ec52e 2490 if (pack_to_stdout != !base_name || argv[i])
b5d97e6b
JH
2491 usage(pack_usage);
2492
2b84b5a8
JS
2493 if (!pack_to_stdout && !pack_size_limit)
2494 pack_size_limit = pack_size_limit_cfg;
01c12a23
DH
2495 if (pack_to_stdout && pack_size_limit)
2496 die("--max-pack-size cannot be used to build a pack for transfer.");
07cf0f24
NP
2497 if (pack_size_limit && pack_size_limit < 1024*1024) {
2498 warning("minimum pack size limit is 1 MiB");
2499 pack_size_limit = 1024*1024;
2500 }
01c12a23 2501
8d1d8f83
JH
2502 if (!pack_to_stdout && thin)
2503 die("--thin cannot be used to build an indexable pack.");
b5d97e6b 2504
ca11b212
NP
2505 if (keep_unreachable && unpack_unreachable)
2506 die("--keep-unreachable and --unpack-unreachable are incompatible.");
2507
4f366275
NP
2508 if (progress && all_progress_implied)
2509 progress = 2;
2510
b5d97e6b
JH
2511 prepare_packed_git();
2512
13aaf148 2513 if (progress)
dc6a0757 2514 progress_state = start_progress("Counting objects", 0);
b5d97e6b
JH
2515 if (!use_internal_rev_list)
2516 read_object_list_from_stdin();
8d1d8f83
JH
2517 else {
2518 rp_av[rp_ac] = NULL;
2519 get_object_list(rp_ac, rp_av);
2520 }
0ef95f72 2521 cleanup_preferred_base();
f0a24aa5
SP
2522 if (include_tag && nr_result)
2523 for_each_ref(add_ref_tag, NULL);
4d4fcc54 2524 stop_progress(&progress_state);
96a02f8f 2525
f0b0af1b 2526 if (non_empty && !nr_result)
1c4a2912 2527 return 0;
f7ae6a93
NP
2528 if (nr_result)
2529 prepare_pack(window, depth);
d01fb92f 2530 write_pack_file();
ab7cd7bb 2531 if (progress)
6e1c2344
RJ
2532 fprintf(stderr, "Total %"PRIu32" (delta %"PRIu32"),"
2533 " reused %"PRIu32" (delta %"PRIu32")\n",
67c08ce1 2534 written, written_delta, reused, reused_delta);
c323ac7d
LT
2535 return 0;
2536}