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merge: fix misleading pre-merge check documentation
[git.git] / builtin / index-pack.c
blob7b2f7c04703f5eff8a1eda06ae59c0d22a8a1ab5
1 #include "builtin.h"
2 #include "config.h"
3 #include "delta.h"
4 #include "pack.h"
5 #include "csum-file.h"
6 #include "blob.h"
7 #include "commit.h"
8 #include "tag.h"
9 #include "tree.h"
10 #include "progress.h"
11 #include "fsck.h"
12 #include "exec_cmd.h"
13 #include "streaming.h"
14 #include "thread-utils.h"
15 #include "packfile.h"
16
17 static const char index_pack_usage[] =
18 "git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
19
20 struct object_entry {
21 struct pack_idx_entry idx;
22 unsigned long size;
23 unsigned char hdr_size;
24 signed char type;
25 signed char real_type;
26 };
27
28 struct object_stat {
29 unsigned delta_depth;
30 int base_object_no;
31 };
32
33 struct base_data {
34 struct base_data *base;
35 struct base_data *child;
36 struct object_entry *obj;
37 void *data;
38 unsigned long size;
39 int ref_first, ref_last;
40 int ofs_first, ofs_last;
41 };
42
43 struct thread_local {
44 #ifndef NO_PTHREADS
45 pthread_t thread;
46 #endif
47 struct base_data *base_cache;
48 size_t base_cache_used;
49 int pack_fd;
50 };
51
52 /* Remember to update object flag allocation in object.h */
53 #define FLAG_LINK (1u<<20)
54 #define FLAG_CHECKED (1u<<21)
55
56 struct ofs_delta_entry {
57 off_t offset;
58 int obj_no;
59 };
60
61 struct ref_delta_entry {
62 unsigned char sha1[20];
63 int obj_no;
64 };
65
66 static struct object_entry *objects;
67 static struct object_stat *obj_stat;
68 static struct ofs_delta_entry *ofs_deltas;
69 static struct ref_delta_entry *ref_deltas;
70 static struct thread_local nothread_data;
71 static int nr_objects;
72 static int nr_ofs_deltas;
73 static int nr_ref_deltas;
74 static int ref_deltas_alloc;
75 static int nr_resolved_deltas;
76 static int nr_threads;
77
78 static int from_stdin;
79 static int strict;
80 static int do_fsck_object;
81 static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
82 static int verbose;
83 static int show_resolving_progress;
84 static int show_stat;
85 static int check_self_contained_and_connected;
86
87 static struct progress *progress;
88
89 /* We always read in 4kB chunks. */
90 static unsigned char input_buffer[4096];
91 static unsigned int input_offset, input_len;
92 static off_t consumed_bytes;
93 static off_t max_input_size;
94 static unsigned deepest_delta;
95 static git_hash_ctx input_ctx;
96 static uint32_t input_crc32;
97 static int input_fd, output_fd;
98 static const char *curr_pack;
99
100 #ifndef NO_PTHREADS
101
102 static struct thread_local *thread_data;
103 static int nr_dispatched;
104 static int threads_active;
105
106 static pthread_mutex_t read_mutex;
107 #define read_lock() lock_mutex(&read_mutex)
108 #define read_unlock() unlock_mutex(&read_mutex)
109
110 static pthread_mutex_t counter_mutex;
111 #define counter_lock() lock_mutex(&counter_mutex)
112 #define counter_unlock() unlock_mutex(&counter_mutex)
113
114 static pthread_mutex_t work_mutex;
115 #define work_lock() lock_mutex(&work_mutex)
116 #define work_unlock() unlock_mutex(&work_mutex)
117
118 static pthread_mutex_t deepest_delta_mutex;
119 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
120 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
121
122 static pthread_mutex_t type_cas_mutex;
123 #define type_cas_lock() lock_mutex(&type_cas_mutex)
124 #define type_cas_unlock() unlock_mutex(&type_cas_mutex)
125
126 static pthread_key_t key;
127
128 static inline void lock_mutex(pthread_mutex_t *mutex)
129 {
130 if (threads_active)
131 pthread_mutex_lock(mutex);
132 }
133
134 static inline void unlock_mutex(pthread_mutex_t *mutex)
135 {
136 if (threads_active)
137 pthread_mutex_unlock(mutex);
138 }
139
140 /*
141 * Mutex and conditional variable can't be statically-initialized on Windows.
142 */
143 static void init_thread(void)
144 {
145 int i;
146 init_recursive_mutex(&read_mutex);
147 pthread_mutex_init(&counter_mutex, NULL);
148 pthread_mutex_init(&work_mutex, NULL);
149 pthread_mutex_init(&type_cas_mutex, NULL);
150 if (show_stat)
151 pthread_mutex_init(&deepest_delta_mutex, NULL);
152 pthread_key_create(&key, NULL);
153 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
154 for (i = 0; i < nr_threads; i++) {
155 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
156 if (thread_data[i].pack_fd == -1)
157 die_errno(_("unable to open %s"), curr_pack);
158 }
159
160 threads_active = 1;
161 }
162
163 static void cleanup_thread(void)
164 {
165 int i;
166 if (!threads_active)
167 return;
168 threads_active = 0;
169 pthread_mutex_destroy(&read_mutex);
170 pthread_mutex_destroy(&counter_mutex);
171 pthread_mutex_destroy(&work_mutex);
172 pthread_mutex_destroy(&type_cas_mutex);
173 if (show_stat)
174 pthread_mutex_destroy(&deepest_delta_mutex);
175 for (i = 0; i < nr_threads; i++)
176 close(thread_data[i].pack_fd);
177 pthread_key_delete(key);
178 free(thread_data);
179 }
180
181 #else
182
183 #define read_lock()
184 #define read_unlock()
185
186 #define counter_lock()
187 #define counter_unlock()
188
189 #define work_lock()
190 #define work_unlock()
191
192 #define deepest_delta_lock()
193 #define deepest_delta_unlock()
194
195 #define type_cas_lock()
196 #define type_cas_unlock()
197
198 #endif
199
200
201 static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
202 {
203 if (!obj)
204 return -1;
205
206 if (type != OBJ_ANY && obj->type != type)
207 die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
208
209 obj->flags |= FLAG_LINK;
210 return 0;
211 }
212
213 /* The content of each linked object must have been checked
214 or it must be already present in the object database */
215 static unsigned check_object(struct object *obj)
216 {
217 if (!obj)
218 return 0;
219
220 if (!(obj->flags & FLAG_LINK))
221 return 0;
222
223 if (!(obj->flags & FLAG_CHECKED)) {
224 unsigned long size;
225 int type = sha1_object_info(obj->oid.hash, &size);
226 if (type <= 0)
227 die(_("did not receive expected object %s"),
228 oid_to_hex(&obj->oid));
229 if (type != obj->type)
230 die(_("object %s: expected type %s, found %s"),
231 oid_to_hex(&obj->oid),
232 type_name(obj->type), type_name(type));
233 obj->flags |= FLAG_CHECKED;
234 return 1;
235 }
236
237 return 0;
238 }
239
240 static unsigned check_objects(void)
241 {
242 unsigned i, max, foreign_nr = 0;
243
244 max = get_max_object_index();
245 for (i = 0; i < max; i++)
246 foreign_nr += check_object(get_indexed_object(i));
247 return foreign_nr;
248 }
249
250
251 /* Discard current buffer used content. */
252 static void flush(void)
253 {
254 if (input_offset) {
255 if (output_fd >= 0)
256 write_or_die(output_fd, input_buffer, input_offset);
257 the_hash_algo->update_fn(&input_ctx, input_buffer, input_offset);
258 memmove(input_buffer, input_buffer + input_offset, input_len);
259 input_offset = 0;
260 }
261 }
262
263 /*
264 * Make sure at least "min" bytes are available in the buffer, and
265 * return the pointer to the buffer.
266 */
267 static void *fill(int min)
268 {
269 if (min <= input_len)
270 return input_buffer + input_offset;
271 if (min > sizeof(input_buffer))
272 die(Q_("cannot fill %d byte",
273 "cannot fill %d bytes",
274 min),
275 min);
276 flush();
277 do {
278 ssize_t ret = xread(input_fd, input_buffer + input_len,
279 sizeof(input_buffer) - input_len);
280 if (ret <= 0) {
281 if (!ret)
282 die(_("early EOF"));
283 die_errno(_("read error on input"));
284 }
285 input_len += ret;
286 if (from_stdin)
287 display_throughput(progress, consumed_bytes + input_len);
288 } while (input_len < min);
289 return input_buffer;
290 }
291
292 static void use(int bytes)
293 {
294 if (bytes > input_len)
295 die(_("used more bytes than were available"));
296 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
297 input_len -= bytes;
298 input_offset += bytes;
299
300 /* make sure off_t is sufficiently large not to wrap */
301 if (signed_add_overflows(consumed_bytes, bytes))
302 die(_("pack too large for current definition of off_t"));
303 consumed_bytes += bytes;
304 if (max_input_size && consumed_bytes > max_input_size)
305 die(_("pack exceeds maximum allowed size"));
306 }
307
308 static const char *open_pack_file(const char *pack_name)
309 {
310 if (from_stdin) {
311 input_fd = 0;
312 if (!pack_name) {
313 struct strbuf tmp_file = STRBUF_INIT;
314 output_fd = odb_mkstemp(&tmp_file,
315 "pack/tmp_pack_XXXXXX");
316 pack_name = strbuf_detach(&tmp_file, NULL);
317 } else {
318 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
319 if (output_fd < 0)
320 die_errno(_("unable to create '%s'"), pack_name);
321 }
322 nothread_data.pack_fd = output_fd;
323 } else {
324 input_fd = open(pack_name, O_RDONLY);
325 if (input_fd < 0)
326 die_errno(_("cannot open packfile '%s'"), pack_name);
327 output_fd = -1;
328 nothread_data.pack_fd = input_fd;
329 }
330 the_hash_algo->init_fn(&input_ctx);
331 return pack_name;
332 }
333
334 static void parse_pack_header(void)
335 {
336 struct pack_header *hdr = fill(sizeof(struct pack_header));
337
338 /* Header consistency check */
339 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
340 die(_("pack signature mismatch"));
341 if (!pack_version_ok(hdr->hdr_version))
342 die(_("pack version %"PRIu32" unsupported"),
343 ntohl(hdr->hdr_version));
344
345 nr_objects = ntohl(hdr->hdr_entries);
346 use(sizeof(struct pack_header));
347 }
348
349 static NORETURN void bad_object(off_t offset, const char *format,
350 ...) __attribute__((format (printf, 2, 3)));
351
352 static NORETURN void bad_object(off_t offset, const char *format, ...)
353 {
354 va_list params;
355 char buf[1024];
356
357 va_start(params, format);
358 vsnprintf(buf, sizeof(buf), format, params);
359 va_end(params);
360 die(_("pack has bad object at offset %"PRIuMAX": %s"),
361 (uintmax_t)offset, buf);
362 }
363
364 static inline struct thread_local *get_thread_data(void)
365 {
366 #ifndef NO_PTHREADS
367 if (threads_active)
368 return pthread_getspecific(key);
369 assert(!threads_active &&
370 "This should only be reached when all threads are gone");
371 #endif
372 return &nothread_data;
373 }
374
375 #ifndef NO_PTHREADS
376 static void set_thread_data(struct thread_local *data)
377 {
378 if (threads_active)
379 pthread_setspecific(key, data);
380 }
381 #endif
382
383 static struct base_data *alloc_base_data(void)
384 {
385 struct base_data *base = xcalloc(1, sizeof(struct base_data));
386 base->ref_last = -1;
387 base->ofs_last = -1;
388 return base;
389 }
390
391 static void free_base_data(struct base_data *c)
392 {
393 if (c->data) {
394 FREE_AND_NULL(c->data);
395 get_thread_data()->base_cache_used -= c->size;
396 }
397 }
398
399 static void prune_base_data(struct base_data *retain)
400 {
401 struct base_data *b;
402 struct thread_local *data = get_thread_data();
403 for (b = data->base_cache;
404 data->base_cache_used > delta_base_cache_limit && b;
405 b = b->child) {
406 if (b->data && b != retain)
407 free_base_data(b);
408 }
409 }
410
411 static void link_base_data(struct base_data *base, struct base_data *c)
412 {
413 if (base)
414 base->child = c;
415 else
416 get_thread_data()->base_cache = c;
417
418 c->base = base;
419 c->child = NULL;
420 if (c->data)
421 get_thread_data()->base_cache_used += c->size;
422 prune_base_data(c);
423 }
424
425 static void unlink_base_data(struct base_data *c)
426 {
427 struct base_data *base = c->base;
428 if (base)
429 base->child = NULL;
430 else
431 get_thread_data()->base_cache = NULL;
432 free_base_data(c);
433 }
434
435 static int is_delta_type(enum object_type type)
436 {
437 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
438 }
439
440 static void *unpack_entry_data(off_t offset, unsigned long size,
441 enum object_type type, struct object_id *oid)
442 {
443 static char fixed_buf[8192];
444 int status;
445 git_zstream stream;
446 void *buf;
447 git_hash_ctx c;
448 char hdr[32];
449 int hdrlen;
450
451 if (!is_delta_type(type)) {
452 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", type_name(type), size) + 1;
453 the_hash_algo->init_fn(&c);
454 the_hash_algo->update_fn(&c, hdr, hdrlen);
455 } else
456 oid = NULL;
457 if (type == OBJ_BLOB && size > big_file_threshold)
458 buf = fixed_buf;
459 else
460 buf = xmallocz(size);
461
462 memset(&stream, 0, sizeof(stream));
463 git_inflate_init(&stream);
464 stream.next_out = buf;
465 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
466
467 do {
468 unsigned char *last_out = stream.next_out;
469 stream.next_in = fill(1);
470 stream.avail_in = input_len;
471 status = git_inflate(&stream, 0);
472 use(input_len - stream.avail_in);
473 if (oid)
474 the_hash_algo->update_fn(&c, last_out, stream.next_out - last_out);
475 if (buf == fixed_buf) {
476 stream.next_out = buf;
477 stream.avail_out = sizeof(fixed_buf);
478 }
479 } while (status == Z_OK);
480 if (stream.total_out != size || status != Z_STREAM_END)
481 bad_object(offset, _("inflate returned %d"), status);
482 git_inflate_end(&stream);
483 if (oid)
484 the_hash_algo->final_fn(oid->hash, &c);
485 return buf == fixed_buf ? NULL : buf;
486 }
487
488 static void *unpack_raw_entry(struct object_entry *obj,
489 off_t *ofs_offset,
490 struct object_id *ref_oid,
491 struct object_id *oid)
492 {
493 unsigned char *p;
494 unsigned long size, c;
495 off_t base_offset;
496 unsigned shift;
497 void *data;
498
499 obj->idx.offset = consumed_bytes;
500 input_crc32 = crc32(0, NULL, 0);
501
502 p = fill(1);
503 c = *p;
504 use(1);
505 obj->type = (c >> 4) & 7;
506 size = (c & 15);
507 shift = 4;
508 while (c & 0x80) {
509 p = fill(1);
510 c = *p;
511 use(1);
512 size += (c & 0x7f) << shift;
513 shift += 7;
514 }
515 obj->size = size;
516
517 switch (obj->type) {
518 case OBJ_REF_DELTA:
519 hashcpy(ref_oid->hash, fill(the_hash_algo->rawsz));
520 use(the_hash_algo->rawsz);
521 break;
522 case OBJ_OFS_DELTA:
523 p = fill(1);
524 c = *p;
525 use(1);
526 base_offset = c & 127;
527 while (c & 128) {
528 base_offset += 1;
529 if (!base_offset || MSB(base_offset, 7))
530 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
531 p = fill(1);
532 c = *p;
533 use(1);
534 base_offset = (base_offset << 7) + (c & 127);
535 }
536 *ofs_offset = obj->idx.offset - base_offset;
537 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
538 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
539 break;
540 case OBJ_COMMIT:
541 case OBJ_TREE:
542 case OBJ_BLOB:
543 case OBJ_TAG:
544 break;
545 default:
546 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
547 }
548 obj->hdr_size = consumed_bytes - obj->idx.offset;
549
550 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, oid);
551 obj->idx.crc32 = input_crc32;
552 return data;
553 }
554
555 static void *unpack_data(struct object_entry *obj,
556 int (*consume)(const unsigned char *, unsigned long, void *),
557 void *cb_data)
558 {
559 off_t from = obj[0].idx.offset + obj[0].hdr_size;
560 off_t len = obj[1].idx.offset - from;
561 unsigned char *data, *inbuf;
562 git_zstream stream;
563 int status;
564
565 data = xmallocz(consume ? 64*1024 : obj->size);
566 inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
567
568 memset(&stream, 0, sizeof(stream));
569 git_inflate_init(&stream);
570 stream.next_out = data;
571 stream.avail_out = consume ? 64*1024 : obj->size;
572
573 do {
574 ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
575 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
576 if (n < 0)
577 die_errno(_("cannot pread pack file"));
578 if (!n)
579 die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
580 "premature end of pack file, %"PRIuMAX" bytes missing",
581 (unsigned int)len),
582 (uintmax_t)len);
583 from += n;
584 len -= n;
585 stream.next_in = inbuf;
586 stream.avail_in = n;
587 if (!consume)
588 status = git_inflate(&stream, 0);
589 else {
590 do {
591 status = git_inflate(&stream, 0);
592 if (consume(data, stream.next_out - data, cb_data)) {
593 free(inbuf);
594 free(data);
595 return NULL;
596 }
597 stream.next_out = data;
598 stream.avail_out = 64*1024;
599 } while (status == Z_OK && stream.avail_in);
600 }
601 } while (len && status == Z_OK && !stream.avail_in);
602
603 /* This has been inflated OK when first encountered, so... */
604 if (status != Z_STREAM_END || stream.total_out != obj->size)
605 die(_("serious inflate inconsistency"));
606
607 git_inflate_end(&stream);
608 free(inbuf);
609 if (consume) {
610 FREE_AND_NULL(data);
611 }
612 return data;
613 }
614
615 static void *get_data_from_pack(struct object_entry *obj)
616 {
617 return unpack_data(obj, NULL, NULL);
618 }
619
620 static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
621 enum object_type type1,
622 enum object_type type2)
623 {
624 int cmp = type1 - type2;
625 if (cmp)
626 return cmp;
627 return offset1 < offset2 ? -1 :
628 offset1 > offset2 ? 1 :
629 0;
630 }
631
632 static int find_ofs_delta(const off_t offset, enum object_type type)
633 {
634 int first = 0, last = nr_ofs_deltas;
635
636 while (first < last) {
637 int next = first + (last - first) / 2;
638 struct ofs_delta_entry *delta = &ofs_deltas[next];
639 int cmp;
640
641 cmp = compare_ofs_delta_bases(offset, delta->offset,
642 type, objects[delta->obj_no].type);
643 if (!cmp)
644 return next;
645 if (cmp < 0) {
646 last = next;
647 continue;
648 }
649 first = next+1;
650 }
651 return -first-1;
652 }
653
654 static void find_ofs_delta_children(off_t offset,
655 int *first_index, int *last_index,
656 enum object_type type)
657 {
658 int first = find_ofs_delta(offset, type);
659 int last = first;
660 int end = nr_ofs_deltas - 1;
661
662 if (first < 0) {
663 *first_index = 0;
664 *last_index = -1;
665 return;
666 }
667 while (first > 0 && ofs_deltas[first - 1].offset == offset)
668 --first;
669 while (last < end && ofs_deltas[last + 1].offset == offset)
670 ++last;
671 *first_index = first;
672 *last_index = last;
673 }
674
675 static int compare_ref_delta_bases(const unsigned char *sha1,
676 const unsigned char *sha2,
677 enum object_type type1,
678 enum object_type type2)
679 {
680 int cmp = type1 - type2;
681 if (cmp)
682 return cmp;
683 return hashcmp(sha1, sha2);
684 }
685
686 static int find_ref_delta(const unsigned char *sha1, enum object_type type)
687 {
688 int first = 0, last = nr_ref_deltas;
689
690 while (first < last) {
691 int next = first + (last - first) / 2;
692 struct ref_delta_entry *delta = &ref_deltas[next];
693 int cmp;
694
695 cmp = compare_ref_delta_bases(sha1, delta->sha1,
696 type, objects[delta->obj_no].type);
697 if (!cmp)
698 return next;
699 if (cmp < 0) {
700 last = next;
701 continue;
702 }
703 first = next+1;
704 }
705 return -first-1;
706 }
707
708 static void find_ref_delta_children(const unsigned char *sha1,
709 int *first_index, int *last_index,
710 enum object_type type)
711 {
712 int first = find_ref_delta(sha1, type);
713 int last = first;
714 int end = nr_ref_deltas - 1;
715
716 if (first < 0) {
717 *first_index = 0;
718 *last_index = -1;
719 return;
720 }
721 while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
722 --first;
723 while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
724 ++last;
725 *first_index = first;
726 *last_index = last;
727 }
728
729 struct compare_data {
730 struct object_entry *entry;
731 struct git_istream *st;
732 unsigned char *buf;
733 unsigned long buf_size;
734 };
735
736 static int compare_objects(const unsigned char *buf, unsigned long size,
737 void *cb_data)
738 {
739 struct compare_data *data = cb_data;
740
741 if (data->buf_size < size) {
742 free(data->buf);
743 data->buf = xmalloc(size);
744 data->buf_size = size;
745 }
746
747 while (size) {
748 ssize_t len = read_istream(data->st, data->buf, size);
749 if (len == 0)
750 die(_("SHA1 COLLISION FOUND WITH %s !"),
751 oid_to_hex(&data->entry->idx.oid));
752 if (len < 0)
753 die(_("unable to read %s"),
754 oid_to_hex(&data->entry->idx.oid));
755 if (memcmp(buf, data->buf, len))
756 die(_("SHA1 COLLISION FOUND WITH %s !"),
757 oid_to_hex(&data->entry->idx.oid));
758 size -= len;
759 buf += len;
760 }
761 return 0;
762 }
763
764 static int check_collison(struct object_entry *entry)
765 {
766 struct compare_data data;
767 enum object_type type;
768 unsigned long size;
769
770 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
771 return -1;
772
773 memset(&data, 0, sizeof(data));
774 data.entry = entry;
775 data.st = open_istream(entry->idx.oid.hash, &type, &size, NULL);
776 if (!data.st)
777 return -1;
778 if (size != entry->size || type != entry->type)
779 die(_("SHA1 COLLISION FOUND WITH %s !"),
780 oid_to_hex(&entry->idx.oid));
781 unpack_data(entry, compare_objects, &data);
782 close_istream(data.st);
783 free(data.buf);
784 return 0;
785 }
786
787 static void sha1_object(const void *data, struct object_entry *obj_entry,
788 unsigned long size, enum object_type type,
789 const struct object_id *oid)
790 {
791 void *new_data = NULL;
792 int collision_test_needed = 0;
793
794 assert(data || obj_entry);
795
796 if (startup_info->have_repository) {
797 read_lock();
798 collision_test_needed =
799 has_sha1_file_with_flags(oid->hash, OBJECT_INFO_QUICK);
800 read_unlock();
801 }
802
803 if (collision_test_needed && !data) {
804 read_lock();
805 if (!check_collison(obj_entry))
806 collision_test_needed = 0;
807 read_unlock();
808 }
809 if (collision_test_needed) {
810 void *has_data;
811 enum object_type has_type;
812 unsigned long has_size;
813 read_lock();
814 has_type = sha1_object_info(oid->hash, &has_size);
815 if (has_type < 0)
816 die(_("cannot read existing object info %s"), oid_to_hex(oid));
817 if (has_type != type || has_size != size)
818 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
819 has_data = read_sha1_file(oid->hash, &has_type, &has_size);
820 read_unlock();
821 if (!data)
822 data = new_data = get_data_from_pack(obj_entry);
823 if (!has_data)
824 die(_("cannot read existing object %s"), oid_to_hex(oid));
825 if (size != has_size || type != has_type ||
826 memcmp(data, has_data, size) != 0)
827 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
828 free(has_data);
829 }
830
831 if (strict || do_fsck_object) {
832 read_lock();
833 if (type == OBJ_BLOB) {
834 struct blob *blob = lookup_blob(oid);
835 if (blob)
836 blob->object.flags |= FLAG_CHECKED;
837 else
838 die(_("invalid blob object %s"), oid_to_hex(oid));
839 if (do_fsck_object &&
840 fsck_object(&blob->object, (void *)data, size, &fsck_options))
841 die(_("fsck error in packed object"));
842 } else {
843 struct object *obj;
844 int eaten;
845 void *buf = (void *) data;
846
847 assert(data && "data can only be NULL for large _blobs_");
848
849 /*
850 * we do not need to free the memory here, as the
851 * buf is deleted by the caller.
852 */
853 obj = parse_object_buffer(oid, type, size, buf,
854 &eaten);
855 if (!obj)
856 die(_("invalid %s"), type_name(type));
857 if (do_fsck_object &&
858 fsck_object(obj, buf, size, &fsck_options))
859 die(_("fsck error in packed object"));
860 if (strict && fsck_walk(obj, NULL, &fsck_options))
861 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
862
863 if (obj->type == OBJ_TREE) {
864 struct tree *item = (struct tree *) obj;
865 item->buffer = NULL;
866 obj->parsed = 0;
867 }
868 if (obj->type == OBJ_COMMIT) {
869 struct commit *commit = (struct commit *) obj;
870 if (detach_commit_buffer(commit, NULL) != data)
871 die("BUG: parse_object_buffer transmogrified our buffer");
872 }
873 obj->flags |= FLAG_CHECKED;
874 }
875 read_unlock();
876 }
877
878 free(new_data);
879 }
880
881 /*
882 * This function is part of find_unresolved_deltas(). There are two
883 * walkers going in the opposite ways.
884 *
885 * The first one in find_unresolved_deltas() traverses down from
886 * parent node to children, deflating nodes along the way. However,
887 * memory for deflated nodes is limited by delta_base_cache_limit, so
888 * at some point parent node's deflated content may be freed.
889 *
890 * The second walker is this function, which goes from current node up
891 * to top parent if necessary to deflate the node. In normal
892 * situation, its parent node would be already deflated, so it just
893 * needs to apply delta.
894 *
895 * In the worst case scenario, parent node is no longer deflated because
896 * we're running out of delta_base_cache_limit; we need to re-deflate
897 * parents, possibly up to the top base.
898 *
899 * All deflated objects here are subject to be freed if we exceed
900 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
901 * just need to make sure the last node is not freed.
902 */
903 static void *get_base_data(struct base_data *c)
904 {
905 if (!c->data) {
906 struct object_entry *obj = c->obj;
907 struct base_data **delta = NULL;
908 int delta_nr = 0, delta_alloc = 0;
909
910 while (is_delta_type(c->obj->type) && !c->data) {
911 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
912 delta[delta_nr++] = c;
913 c = c->base;
914 }
915 if (!delta_nr) {
916 c->data = get_data_from_pack(obj);
917 c->size = obj->size;
918 get_thread_data()->base_cache_used += c->size;
919 prune_base_data(c);
920 }
921 for (; delta_nr > 0; delta_nr--) {
922 void *base, *raw;
923 c = delta[delta_nr - 1];
924 obj = c->obj;
925 base = get_base_data(c->base);
926 raw = get_data_from_pack(obj);
927 c->data = patch_delta(
928 base, c->base->size,
929 raw, obj->size,
930 &c->size);
931 free(raw);
932 if (!c->data)
933 bad_object(obj->idx.offset, _("failed to apply delta"));
934 get_thread_data()->base_cache_used += c->size;
935 prune_base_data(c);
936 }
937 free(delta);
938 }
939 return c->data;
940 }
941
942 static void resolve_delta(struct object_entry *delta_obj,
943 struct base_data *base, struct base_data *result)
944 {
945 void *base_data, *delta_data;
946
947 if (show_stat) {
948 int i = delta_obj - objects;
949 int j = base->obj - objects;
950 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
951 deepest_delta_lock();
952 if (deepest_delta < obj_stat[i].delta_depth)
953 deepest_delta = obj_stat[i].delta_depth;
954 deepest_delta_unlock();
955 obj_stat[i].base_object_no = j;
956 }
957 delta_data = get_data_from_pack(delta_obj);
958 base_data = get_base_data(base);
959 result->obj = delta_obj;
960 result->data = patch_delta(base_data, base->size,
961 delta_data, delta_obj->size, &result->size);
962 free(delta_data);
963 if (!result->data)
964 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
965 hash_object_file(result->data, result->size,
966 type_name(delta_obj->real_type), &delta_obj->idx.oid);
967 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
968 &delta_obj->idx.oid);
969 counter_lock();
970 nr_resolved_deltas++;
971 counter_unlock();
972 }
973
974 /*
975 * Standard boolean compare-and-swap: atomically check whether "*type" is
976 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
977 * and return false.
978 */
979 static int compare_and_swap_type(signed char *type,
980 enum object_type want,
981 enum object_type set)
982 {
983 enum object_type old;
984
985 type_cas_lock();
986 old = *type;
987 if (old == want)
988 *type = set;
989 type_cas_unlock();
990
991 return old == want;
992 }
993
994 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
995 struct base_data *prev_base)
996 {
997 if (base->ref_last == -1 && base->ofs_last == -1) {
998 find_ref_delta_children(base->obj->idx.oid.hash,
999 &base->ref_first, &base->ref_last,
1000 OBJ_REF_DELTA);
1001
1002 find_ofs_delta_children(base->obj->idx.offset,
1003 &base->ofs_first, &base->ofs_last,
1004 OBJ_OFS_DELTA);
1005
1006 if (base->ref_last == -1 && base->ofs_last == -1) {
1007 free(base->data);
1008 return NULL;
1009 }
1010
1011 link_base_data(prev_base, base);
1012 }
1013
1014 if (base->ref_first <= base->ref_last) {
1015 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1016 struct base_data *result = alloc_base_data();
1017
1018 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1019 base->obj->real_type))
1020 die("BUG: child->real_type != OBJ_REF_DELTA");
1021
1022 resolve_delta(child, base, result);
1023 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1024 free_base_data(base);
1025
1026 base->ref_first++;
1027 return result;
1028 }
1029
1030 if (base->ofs_first <= base->ofs_last) {
1031 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1032 struct base_data *result = alloc_base_data();
1033
1034 assert(child->real_type == OBJ_OFS_DELTA);
1035 child->real_type = base->obj->real_type;
1036 resolve_delta(child, base, result);
1037 if (base->ofs_first == base->ofs_last)
1038 free_base_data(base);
1039
1040 base->ofs_first++;
1041 return result;
1042 }
1043
1044 unlink_base_data(base);
1045 return NULL;
1046 }
1047
1048 static void find_unresolved_deltas(struct base_data *base)
1049 {
1050 struct base_data *new_base, *prev_base = NULL;
1051 for (;;) {
1052 new_base = find_unresolved_deltas_1(base, prev_base);
1053
1054 if (new_base) {
1055 prev_base = base;
1056 base = new_base;
1057 } else {
1058 free(base);
1059 base = prev_base;
1060 if (!base)
1061 return;
1062 prev_base = base->base;
1063 }
1064 }
1065 }
1066
1067 static int compare_ofs_delta_entry(const void *a, const void *b)
1068 {
1069 const struct ofs_delta_entry *delta_a = a;
1070 const struct ofs_delta_entry *delta_b = b;
1071
1072 return delta_a->offset < delta_b->offset ? -1 :
1073 delta_a->offset > delta_b->offset ? 1 :
1074 0;
1075 }
1076
1077 static int compare_ref_delta_entry(const void *a, const void *b)
1078 {
1079 const struct ref_delta_entry *delta_a = a;
1080 const struct ref_delta_entry *delta_b = b;
1081
1082 return hashcmp(delta_a->sha1, delta_b->sha1);
1083 }
1084
1085 static void resolve_base(struct object_entry *obj)
1086 {
1087 struct base_data *base_obj = alloc_base_data();
1088 base_obj->obj = obj;
1089 base_obj->data = NULL;
1090 find_unresolved_deltas(base_obj);
1091 }
1092
1093 #ifndef NO_PTHREADS
1094 static void *threaded_second_pass(void *data)
1095 {
1096 set_thread_data(data);
1097 for (;;) {
1098 int i;
1099 counter_lock();
1100 display_progress(progress, nr_resolved_deltas);
1101 counter_unlock();
1102 work_lock();
1103 while (nr_dispatched < nr_objects &&
1104 is_delta_type(objects[nr_dispatched].type))
1105 nr_dispatched++;
1106 if (nr_dispatched >= nr_objects) {
1107 work_unlock();
1108 break;
1109 }
1110 i = nr_dispatched++;
1111 work_unlock();
1112
1113 resolve_base(&objects[i]);
1114 }
1115 return NULL;
1116 }
1117 #endif
1118
1119 /*
1120 * First pass:
1121 * - find locations of all objects;
1122 * - calculate SHA1 of all non-delta objects;
1123 * - remember base (SHA1 or offset) for all deltas.
1124 */
1125 static void parse_pack_objects(unsigned char *hash)
1126 {
1127 int i, nr_delays = 0;
1128 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1129 struct object_id ref_delta_oid;
1130 struct stat st;
1131
1132 if (verbose)
1133 progress = start_progress(
1134 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1135 nr_objects);
1136 for (i = 0; i < nr_objects; i++) {
1137 struct object_entry *obj = &objects[i];
1138 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1139 &ref_delta_oid,
1140 &obj->idx.oid);
1141 obj->real_type = obj->type;
1142 if (obj->type == OBJ_OFS_DELTA) {
1143 nr_ofs_deltas++;
1144 ofs_delta->obj_no = i;
1145 ofs_delta++;
1146 } else if (obj->type == OBJ_REF_DELTA) {
1147 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1148 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_oid.hash);
1149 ref_deltas[nr_ref_deltas].obj_no = i;
1150 nr_ref_deltas++;
1151 } else if (!data) {
1152 /* large blobs, check later */
1153 obj->real_type = OBJ_BAD;
1154 nr_delays++;
1155 } else
1156 sha1_object(data, NULL, obj->size, obj->type,
1157 &obj->idx.oid);
1158 free(data);
1159 display_progress(progress, i+1);
1160 }
1161 objects[i].idx.offset = consumed_bytes;
1162 stop_progress(&progress);
1163
1164 /* Check pack integrity */
1165 flush();
1166 the_hash_algo->final_fn(hash, &input_ctx);
1167 if (hashcmp(fill(the_hash_algo->rawsz), hash))
1168 die(_("pack is corrupted (SHA1 mismatch)"));
1169 use(the_hash_algo->rawsz);
1170
1171 /* If input_fd is a file, we should have reached its end now. */
1172 if (fstat(input_fd, &st))
1173 die_errno(_("cannot fstat packfile"));
1174 if (S_ISREG(st.st_mode) &&
1175 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1176 die(_("pack has junk at the end"));
1177
1178 for (i = 0; i < nr_objects; i++) {
1179 struct object_entry *obj = &objects[i];
1180 if (obj->real_type != OBJ_BAD)
1181 continue;
1182 obj->real_type = obj->type;
1183 sha1_object(NULL, obj, obj->size, obj->type,
1184 &obj->idx.oid);
1185 nr_delays--;
1186 }
1187 if (nr_delays)
1188 die(_("confusion beyond insanity in parse_pack_objects()"));
1189 }
1190
1191 /*
1192 * Second pass:
1193 * - for all non-delta objects, look if it is used as a base for
1194 * deltas;
1195 * - if used as a base, uncompress the object and apply all deltas,
1196 * recursively checking if the resulting object is used as a base
1197 * for some more deltas.
1198 */
1199 static void resolve_deltas(void)
1200 {
1201 int i;
1202
1203 if (!nr_ofs_deltas && !nr_ref_deltas)
1204 return;
1205
1206 /* Sort deltas by base SHA1/offset for fast searching */
1207 QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
1208 QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
1209
1210 if (verbose || show_resolving_progress)
1211 progress = start_progress(_("Resolving deltas"),
1212 nr_ref_deltas + nr_ofs_deltas);
1213
1214 #ifndef NO_PTHREADS
1215 nr_dispatched = 0;
1216 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1217 init_thread();
1218 for (i = 0; i < nr_threads; i++) {
1219 int ret = pthread_create(&thread_data[i].thread, NULL,
1220 threaded_second_pass, thread_data + i);
1221 if (ret)
1222 die(_("unable to create thread: %s"),
1223 strerror(ret));
1224 }
1225 for (i = 0; i < nr_threads; i++)
1226 pthread_join(thread_data[i].thread, NULL);
1227 cleanup_thread();
1228 return;
1229 }
1230 #endif
1231
1232 for (i = 0; i < nr_objects; i++) {
1233 struct object_entry *obj = &objects[i];
1234
1235 if (is_delta_type(obj->type))
1236 continue;
1237 resolve_base(obj);
1238 display_progress(progress, nr_resolved_deltas);
1239 }
1240 }
1241
1242 /*
1243 * Third pass:
1244 * - append objects to convert thin pack to full pack if required
1245 * - write the final pack hash
1246 */
1247 static void fix_unresolved_deltas(struct hashfile *f);
1248 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_hash)
1249 {
1250 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1251 stop_progress(&progress);
1252 /* Flush remaining pack final hash. */
1253 flush();
1254 return;
1255 }
1256
1257 if (fix_thin_pack) {
1258 struct hashfile *f;
1259 unsigned char read_hash[GIT_MAX_RAWSZ], tail_hash[GIT_MAX_RAWSZ];
1260 struct strbuf msg = STRBUF_INIT;
1261 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1262 int nr_objects_initial = nr_objects;
1263 if (nr_unresolved <= 0)
1264 die(_("confusion beyond insanity"));
1265 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1266 memset(objects + nr_objects + 1, 0,
1267 nr_unresolved * sizeof(*objects));
1268 f = hashfd(output_fd, curr_pack);
1269 fix_unresolved_deltas(f);
1270 strbuf_addf(&msg, Q_("completed with %d local object",
1271 "completed with %d local objects",
1272 nr_objects - nr_objects_initial),
1273 nr_objects - nr_objects_initial);
1274 stop_progress_msg(&progress, msg.buf);
1275 strbuf_release(&msg);
1276 hashclose(f, tail_hash, 0);
1277 hashcpy(read_hash, pack_hash);
1278 fixup_pack_header_footer(output_fd, pack_hash,
1279 curr_pack, nr_objects,
1280 read_hash, consumed_bytes-the_hash_algo->rawsz);
1281 if (hashcmp(read_hash, tail_hash) != 0)
1282 die(_("Unexpected tail checksum for %s "
1283 "(disk corruption?)"), curr_pack);
1284 }
1285 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1286 die(Q_("pack has %d unresolved delta",
1287 "pack has %d unresolved deltas",
1288 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1289 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1290 }
1291
1292 static int write_compressed(struct hashfile *f, void *in, unsigned int size)
1293 {
1294 git_zstream stream;
1295 int status;
1296 unsigned char outbuf[4096];
1297
1298 git_deflate_init(&stream, zlib_compression_level);
1299 stream.next_in = in;
1300 stream.avail_in = size;
1301
1302 do {
1303 stream.next_out = outbuf;
1304 stream.avail_out = sizeof(outbuf);
1305 status = git_deflate(&stream, Z_FINISH);
1306 hashwrite(f, outbuf, sizeof(outbuf) - stream.avail_out);
1307 } while (status == Z_OK);
1308
1309 if (status != Z_STREAM_END)
1310 die(_("unable to deflate appended object (%d)"), status);
1311 size = stream.total_out;
1312 git_deflate_end(&stream);
1313 return size;
1314 }
1315
1316 static struct object_entry *append_obj_to_pack(struct hashfile *f,
1317 const unsigned char *sha1, void *buf,
1318 unsigned long size, enum object_type type)
1319 {
1320 struct object_entry *obj = &objects[nr_objects++];
1321 unsigned char header[10];
1322 unsigned long s = size;
1323 int n = 0;
1324 unsigned char c = (type << 4) | (s & 15);
1325 s >>= 4;
1326 while (s) {
1327 header[n++] = c | 0x80;
1328 c = s & 0x7f;
1329 s >>= 7;
1330 }
1331 header[n++] = c;
1332 crc32_begin(f);
1333 hashwrite(f, header, n);
1334 obj[0].size = size;
1335 obj[0].hdr_size = n;
1336 obj[0].type = type;
1337 obj[0].real_type = type;
1338 obj[1].idx.offset = obj[0].idx.offset + n;
1339 obj[1].idx.offset += write_compressed(f, buf, size);
1340 obj[0].idx.crc32 = crc32_end(f);
1341 hashflush(f);
1342 hashcpy(obj->idx.oid.hash, sha1);
1343 return obj;
1344 }
1345
1346 static int delta_pos_compare(const void *_a, const void *_b)
1347 {
1348 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1349 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1350 return a->obj_no - b->obj_no;
1351 }
1352
1353 static void fix_unresolved_deltas(struct hashfile *f)
1354 {
1355 struct ref_delta_entry **sorted_by_pos;
1356 int i;
1357
1358 /*
1359 * Since many unresolved deltas may well be themselves base objects
1360 * for more unresolved deltas, we really want to include the
1361 * smallest number of base objects that would cover as much delta
1362 * as possible by picking the
1363 * trunc deltas first, allowing for other deltas to resolve without
1364 * additional base objects. Since most base objects are to be found
1365 * before deltas depending on them, a good heuristic is to start
1366 * resolving deltas in the same order as their position in the pack.
1367 */
1368 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1369 for (i = 0; i < nr_ref_deltas; i++)
1370 sorted_by_pos[i] = &ref_deltas[i];
1371 QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
1372
1373 for (i = 0; i < nr_ref_deltas; i++) {
1374 struct ref_delta_entry *d = sorted_by_pos[i];
1375 enum object_type type;
1376 struct base_data *base_obj = alloc_base_data();
1377
1378 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1379 continue;
1380 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1381 if (!base_obj->data)
1382 continue;
1383
1384 if (check_sha1_signature(d->sha1, base_obj->data,
1385 base_obj->size, type_name(type)))
1386 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1387 base_obj->obj = append_obj_to_pack(f, d->sha1,
1388 base_obj->data, base_obj->size, type);
1389 find_unresolved_deltas(base_obj);
1390 display_progress(progress, nr_resolved_deltas);
1391 }
1392 free(sorted_by_pos);
1393 }
1394
1395 static const char *derive_filename(const char *pack_name, const char *suffix,
1396 struct strbuf *buf)
1397 {
1398 size_t len;
1399 if (!strip_suffix(pack_name, ".pack", &len))
1400 die(_("packfile name '%s' does not end with '.pack'"),
1401 pack_name);
1402 strbuf_add(buf, pack_name, len);
1403 strbuf_addch(buf, '.');
1404 strbuf_addstr(buf, suffix);
1405 return buf->buf;
1406 }
1407
1408 static void write_special_file(const char *suffix, const char *msg,
1409 const char *pack_name, const unsigned char *hash,
1410 const char **report)
1411 {
1412 struct strbuf name_buf = STRBUF_INIT;
1413 const char *filename;
1414 int fd;
1415 int msg_len = strlen(msg);
1416
1417 if (pack_name)
1418 filename = derive_filename(pack_name, suffix, &name_buf);
1419 else
1420 filename = odb_pack_name(&name_buf, hash, suffix);
1421
1422 fd = odb_pack_keep(filename);
1423 if (fd < 0) {
1424 if (errno != EEXIST)
1425 die_errno(_("cannot write %s file '%s'"),
1426 suffix, filename);
1427 } else {
1428 if (msg_len > 0) {
1429 write_or_die(fd, msg, msg_len);
1430 write_or_die(fd, "\n", 1);
1431 }
1432 if (close(fd) != 0)
1433 die_errno(_("cannot close written %s file '%s'"),
1434 suffix, filename);
1435 if (report)
1436 *report = suffix;
1437 }
1438 strbuf_release(&name_buf);
1439 }
1440
1441 static void final(const char *final_pack_name, const char *curr_pack_name,
1442 const char *final_index_name, const char *curr_index_name,
1443 const char *keep_msg, const char *promisor_msg,
1444 unsigned char *hash)
1445 {
1446 const char *report = "pack";
1447 struct strbuf pack_name = STRBUF_INIT;
1448 struct strbuf index_name = STRBUF_INIT;
1449 int err;
1450
1451 if (!from_stdin) {
1452 close(input_fd);
1453 } else {
1454 fsync_or_die(output_fd, curr_pack_name);
1455 err = close(output_fd);
1456 if (err)
1457 die_errno(_("error while closing pack file"));
1458 }
1459
1460 if (keep_msg)
1461 write_special_file("keep", keep_msg, final_pack_name, hash,
1462 &report);
1463 if (promisor_msg)
1464 write_special_file("promisor", promisor_msg, final_pack_name,
1465 hash, NULL);
1466
1467 if (final_pack_name != curr_pack_name) {
1468 if (!final_pack_name)
1469 final_pack_name = odb_pack_name(&pack_name, hash, "pack");
1470 if (finalize_object_file(curr_pack_name, final_pack_name))
1471 die(_("cannot store pack file"));
1472 } else if (from_stdin)
1473 chmod(final_pack_name, 0444);
1474
1475 if (final_index_name != curr_index_name) {
1476 if (!final_index_name)
1477 final_index_name = odb_pack_name(&index_name, hash, "idx");
1478 if (finalize_object_file(curr_index_name, final_index_name))
1479 die(_("cannot store index file"));
1480 } else
1481 chmod(final_index_name, 0444);
1482
1483 if (do_fsck_object)
1484 add_packed_git(final_index_name, strlen(final_index_name), 0);
1485
1486 if (!from_stdin) {
1487 printf("%s\n", sha1_to_hex(hash));
1488 } else {
1489 struct strbuf buf = STRBUF_INIT;
1490
1491 strbuf_addf(&buf, "%s\t%s\n", report, sha1_to_hex(hash));
1492 write_or_die(1, buf.buf, buf.len);
1493 strbuf_release(&buf);
1494
1495 /*
1496 * Let's just mimic git-unpack-objects here and write
1497 * the last part of the input buffer to stdout.
1498 */
1499 while (input_len) {
1500 err = xwrite(1, input_buffer + input_offset, input_len);
1501 if (err <= 0)
1502 break;
1503 input_len -= err;
1504 input_offset += err;
1505 }
1506 }
1507
1508 strbuf_release(&index_name);
1509 strbuf_release(&pack_name);
1510 }
1511
1512 static int git_index_pack_config(const char *k, const char *v, void *cb)
1513 {
1514 struct pack_idx_option *opts = cb;
1515
1516 if (!strcmp(k, "pack.indexversion")) {
1517 opts->version = git_config_int(k, v);
1518 if (opts->version > 2)
1519 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1520 return 0;
1521 }
1522 if (!strcmp(k, "pack.threads")) {
1523 nr_threads = git_config_int(k, v);
1524 if (nr_threads < 0)
1525 die(_("invalid number of threads specified (%d)"),
1526 nr_threads);
1527 #ifdef NO_PTHREADS
1528 if (nr_threads != 1)
1529 warning(_("no threads support, ignoring %s"), k);
1530 nr_threads = 1;
1531 #endif
1532 return 0;
1533 }
1534 return git_default_config(k, v, cb);
1535 }
1536
1537 static int cmp_uint32(const void *a_, const void *b_)
1538 {
1539 uint32_t a = *((uint32_t *)a_);
1540 uint32_t b = *((uint32_t *)b_);
1541
1542 return (a < b) ? -1 : (a != b);
1543 }
1544
1545 static void read_v2_anomalous_offsets(struct packed_git *p,
1546 struct pack_idx_option *opts)
1547 {
1548 const uint32_t *idx1, *idx2;
1549 uint32_t i;
1550
1551 /* The address of the 4-byte offset table */
1552 idx1 = (((const uint32_t *)p->index_data)
1553 + 2 /* 8-byte header */
1554 + 256 /* fan out */
1555 + 5 * p->num_objects /* 20-byte SHA-1 table */
1556 + p->num_objects /* CRC32 table */
1557 );
1558
1559 /* The address of the 8-byte offset table */
1560 idx2 = idx1 + p->num_objects;
1561
1562 for (i = 0; i < p->num_objects; i++) {
1563 uint32_t off = ntohl(idx1[i]);
1564 if (!(off & 0x80000000))
1565 continue;
1566 off = off & 0x7fffffff;
1567 check_pack_index_ptr(p, &idx2[off * 2]);
1568 if (idx2[off * 2])
1569 continue;
1570 /*
1571 * The real offset is ntohl(idx2[off * 2]) in high 4
1572 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1573 * octets. But idx2[off * 2] is Zero!!!
1574 */
1575 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1576 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1577 }
1578
1579 QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
1580 }
1581
1582 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1583 {
1584 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1585
1586 if (!p)
1587 die(_("Cannot open existing pack file '%s'"), pack_name);
1588 if (open_pack_index(p))
1589 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1590
1591 /* Read the attributes from the existing idx file */
1592 opts->version = p->index_version;
1593
1594 if (opts->version == 2)
1595 read_v2_anomalous_offsets(p, opts);
1596
1597 /*
1598 * Get rid of the idx file as we do not need it anymore.
1599 * NEEDSWORK: extract this bit from free_pack_by_name() in
1600 * sha1_file.c, perhaps? It shouldn't matter very much as we
1601 * know we haven't installed this pack (hence we never have
1602 * read anything from it).
1603 */
1604 close_pack_index(p);
1605 free(p);
1606 }
1607
1608 static void show_pack_info(int stat_only)
1609 {
1610 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1611 unsigned long *chain_histogram = NULL;
1612
1613 if (deepest_delta)
1614 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1615
1616 for (i = 0; i < nr_objects; i++) {
1617 struct object_entry *obj = &objects[i];
1618
1619 if (is_delta_type(obj->type))
1620 chain_histogram[obj_stat[i].delta_depth - 1]++;
1621 if (stat_only)
1622 continue;
1623 printf("%s %-6s %lu %lu %"PRIuMAX,
1624 oid_to_hex(&obj->idx.oid),
1625 type_name(obj->real_type), obj->size,
1626 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1627 (uintmax_t)obj->idx.offset);
1628 if (is_delta_type(obj->type)) {
1629 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1630 printf(" %u %s", obj_stat[i].delta_depth,
1631 oid_to_hex(&bobj->idx.oid));
1632 }
1633 putchar('\n');
1634 }
1635
1636 if (baseobjects)
1637 printf_ln(Q_("non delta: %d object",
1638 "non delta: %d objects",
1639 baseobjects),
1640 baseobjects);
1641 for (i = 0; i < deepest_delta; i++) {
1642 if (!chain_histogram[i])
1643 continue;
1644 printf_ln(Q_("chain length = %d: %lu object",
1645 "chain length = %d: %lu objects",
1646 chain_histogram[i]),
1647 i + 1,
1648 chain_histogram[i]);
1649 }
1650 }
1651
1652 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1653 {
1654 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1655 const char *curr_index;
1656 const char *index_name = NULL, *pack_name = NULL;
1657 const char *keep_msg = NULL;
1658 const char *promisor_msg = NULL;
1659 struct strbuf index_name_buf = STRBUF_INIT;
1660 struct pack_idx_entry **idx_objects;
1661 struct pack_idx_option opts;
1662 unsigned char pack_hash[GIT_MAX_RAWSZ];
1663 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1664 int report_end_of_input = 0;
1665
1666 /*
1667 * index-pack never needs to fetch missing objects, since it only
1668 * accesses the repo to do hash collision checks
1669 */
1670 fetch_if_missing = 0;
1671
1672 if (argc == 2 && !strcmp(argv[1], "-h"))
1673 usage(index_pack_usage);
1674
1675 check_replace_refs = 0;
1676 fsck_options.walk = mark_link;
1677
1678 reset_pack_idx_option(&opts);
1679 git_config(git_index_pack_config, &opts);
1680 if (prefix && chdir(prefix))
1681 die(_("Cannot come back to cwd"));
1682
1683 for (i = 1; i < argc; i++) {
1684 const char *arg = argv[i];
1685
1686 if (*arg == '-') {
1687 if (!strcmp(arg, "--stdin")) {
1688 from_stdin = 1;
1689 } else if (!strcmp(arg, "--fix-thin")) {
1690 fix_thin_pack = 1;
1691 } else if (skip_to_optional_arg(arg, "--strict", &arg)) {
1692 strict = 1;
1693 do_fsck_object = 1;
1694 fsck_set_msg_types(&fsck_options, arg);
1695 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1696 strict = 1;
1697 check_self_contained_and_connected = 1;
1698 } else if (!strcmp(arg, "--fsck-objects")) {
1699 do_fsck_object = 1;
1700 } else if (!strcmp(arg, "--verify")) {
1701 verify = 1;
1702 } else if (!strcmp(arg, "--verify-stat")) {
1703 verify = 1;
1704 show_stat = 1;
1705 } else if (!strcmp(arg, "--verify-stat-only")) {
1706 verify = 1;
1707 show_stat = 1;
1708 stat_only = 1;
1709 } else if (skip_to_optional_arg(arg, "--keep", &keep_msg)) {
1710 ; /* nothing to do */
1711 } else if (skip_to_optional_arg(arg, "--promisor", &promisor_msg)) {
1712 ; /* already parsed */
1713 } else if (starts_with(arg, "--threads=")) {
1714 char *end;
1715 nr_threads = strtoul(arg+10, &end, 0);
1716 if (!arg[10] || *end || nr_threads < 0)
1717 usage(index_pack_usage);
1718 #ifdef NO_PTHREADS
1719 if (nr_threads != 1)
1720 warning(_("no threads support, "
1721 "ignoring %s"), arg);
1722 nr_threads = 1;
1723 #endif
1724 } else if (starts_with(arg, "--pack_header=")) {
1725 struct pack_header *hdr;
1726 char *c;
1727
1728 hdr = (struct pack_header *)input_buffer;
1729 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1730 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1731 if (*c != ',')
1732 die(_("bad %s"), arg);
1733 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1734 if (*c)
1735 die(_("bad %s"), arg);
1736 input_len = sizeof(*hdr);
1737 } else if (!strcmp(arg, "-v")) {
1738 verbose = 1;
1739 } else if (!strcmp(arg, "--show-resolving-progress")) {
1740 show_resolving_progress = 1;
1741 } else if (!strcmp(arg, "--report-end-of-input")) {
1742 report_end_of_input = 1;
1743 } else if (!strcmp(arg, "-o")) {
1744 if (index_name || (i+1) >= argc)
1745 usage(index_pack_usage);
1746 index_name = argv[++i];
1747 } else if (starts_with(arg, "--index-version=")) {
1748 char *c;
1749 opts.version = strtoul(arg + 16, &c, 10);
1750 if (opts.version > 2)
1751 die(_("bad %s"), arg);
1752 if (*c == ',')
1753 opts.off32_limit = strtoul(c+1, &c, 0);
1754 if (*c || opts.off32_limit & 0x80000000)
1755 die(_("bad %s"), arg);
1756 } else if (skip_prefix(arg, "--max-input-size=", &arg)) {
1757 max_input_size = strtoumax(arg, NULL, 10);
1758 } else
1759 usage(index_pack_usage);
1760 continue;
1761 }
1762
1763 if (pack_name)
1764 usage(index_pack_usage);
1765 pack_name = arg;
1766 }
1767
1768 if (!pack_name && !from_stdin)
1769 usage(index_pack_usage);
1770 if (fix_thin_pack && !from_stdin)
1771 die(_("--fix-thin cannot be used without --stdin"));
1772 if (from_stdin && !startup_info->have_repository)
1773 die(_("--stdin requires a git repository"));
1774 if (!index_name && pack_name)
1775 index_name = derive_filename(pack_name, "idx", &index_name_buf);
1776
1777 if (verify) {
1778 if (!index_name)
1779 die(_("--verify with no packfile name given"));
1780 read_idx_option(&opts, index_name);
1781 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1782 }
1783 if (strict)
1784 opts.flags |= WRITE_IDX_STRICT;
1785
1786 #ifndef NO_PTHREADS
1787 if (!nr_threads) {
1788 nr_threads = online_cpus();
1789 /* An experiment showed that more threads does not mean faster */
1790 if (nr_threads > 3)
1791 nr_threads = 3;
1792 }
1793 #endif
1794
1795 curr_pack = open_pack_file(pack_name);
1796 parse_pack_header();
1797 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1798 if (show_stat)
1799 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1800 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1801 parse_pack_objects(pack_hash);
1802 if (report_end_of_input)
1803 write_in_full(2, "\0", 1);
1804 resolve_deltas();
1805 conclude_pack(fix_thin_pack, curr_pack, pack_hash);
1806 free(ofs_deltas);
1807 free(ref_deltas);
1808 if (strict)
1809 foreign_nr = check_objects();
1810
1811 if (show_stat)
1812 show_pack_info(stat_only);
1813
1814 ALLOC_ARRAY(idx_objects, nr_objects);
1815 for (i = 0; i < nr_objects; i++)
1816 idx_objects[i] = &objects[i].idx;
1817 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_hash);
1818 free(idx_objects);
1819
1820 if (!verify)
1821 final(pack_name, curr_pack,
1822 index_name, curr_index,
1823 keep_msg, promisor_msg,
1824 pack_hash);
1825 else
1826 close(input_fd);
1827
1828 if (do_fsck_object && fsck_finish(&fsck_options))
1829 die(_("fsck error in pack objects"));
1830
1831 free(objects);
1832 strbuf_release(&index_name_buf);
1833 if (pack_name == NULL)
1834 free((void *) curr_pack);
1835 if (index_name == NULL)
1836 free((void *) curr_index);
1837
1838 /*
1839 * Let the caller know this pack is not self contained
1840 */
1841 if (check_self_contained_and_connected && foreign_nr)
1842 return 1;
1843
1844 return 0;
1845 }
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