walker: drop fields of `struct walker` which are always 1
[git/git.git] / builtin / index-pack.c
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 } else {
840 struct object *obj;
841 int eaten;
842 void *buf = (void *) data;
843
844 assert(data && "data can only be NULL for large _blobs_");
845
846 /*
847 * we do not need to free the memory here, as the
848 * buf is deleted by the caller.
849 */
850 obj = parse_object_buffer(oid, type, size, buf,
851 &eaten);
852 if (!obj)
853 die(_("invalid %s"), type_name(type));
854 if (do_fsck_object &&
855 fsck_object(obj, buf, size, &fsck_options))
856 die(_("Error in object"));
857 if (strict && fsck_walk(obj, NULL, &fsck_options))
858 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
859
860 if (obj->type == OBJ_TREE) {
861 struct tree *item = (struct tree *) obj;
862 item->buffer = NULL;
863 obj->parsed = 0;
864 }
865 if (obj->type == OBJ_COMMIT) {
866 struct commit *commit = (struct commit *) obj;
867 if (detach_commit_buffer(commit, NULL) != data)
868 die("BUG: parse_object_buffer transmogrified our buffer");
869 }
870 obj->flags |= FLAG_CHECKED;
871 }
872 read_unlock();
873 }
874
875 free(new_data);
876 }
877
878 /*
879 * This function is part of find_unresolved_deltas(). There are two
880 * walkers going in the opposite ways.
881 *
882 * The first one in find_unresolved_deltas() traverses down from
883 * parent node to children, deflating nodes along the way. However,
884 * memory for deflated nodes is limited by delta_base_cache_limit, so
885 * at some point parent node's deflated content may be freed.
886 *
887 * The second walker is this function, which goes from current node up
888 * to top parent if necessary to deflate the node. In normal
889 * situation, its parent node would be already deflated, so it just
890 * needs to apply delta.
891 *
892 * In the worst case scenario, parent node is no longer deflated because
893 * we're running out of delta_base_cache_limit; we need to re-deflate
894 * parents, possibly up to the top base.
895 *
896 * All deflated objects here are subject to be freed if we exceed
897 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
898 * just need to make sure the last node is not freed.
899 */
900 static void *get_base_data(struct base_data *c)
901 {
902 if (!c->data) {
903 struct object_entry *obj = c->obj;
904 struct base_data **delta = NULL;
905 int delta_nr = 0, delta_alloc = 0;
906
907 while (is_delta_type(c->obj->type) && !c->data) {
908 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
909 delta[delta_nr++] = c;
910 c = c->base;
911 }
912 if (!delta_nr) {
913 c->data = get_data_from_pack(obj);
914 c->size = obj->size;
915 get_thread_data()->base_cache_used += c->size;
916 prune_base_data(c);
917 }
918 for (; delta_nr > 0; delta_nr--) {
919 void *base, *raw;
920 c = delta[delta_nr - 1];
921 obj = c->obj;
922 base = get_base_data(c->base);
923 raw = get_data_from_pack(obj);
924 c->data = patch_delta(
925 base, c->base->size,
926 raw, obj->size,
927 &c->size);
928 free(raw);
929 if (!c->data)
930 bad_object(obj->idx.offset, _("failed to apply delta"));
931 get_thread_data()->base_cache_used += c->size;
932 prune_base_data(c);
933 }
934 free(delta);
935 }
936 return c->data;
937 }
938
939 static void resolve_delta(struct object_entry *delta_obj,
940 struct base_data *base, struct base_data *result)
941 {
942 void *base_data, *delta_data;
943
944 if (show_stat) {
945 int i = delta_obj - objects;
946 int j = base->obj - objects;
947 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
948 deepest_delta_lock();
949 if (deepest_delta < obj_stat[i].delta_depth)
950 deepest_delta = obj_stat[i].delta_depth;
951 deepest_delta_unlock();
952 obj_stat[i].base_object_no = j;
953 }
954 delta_data = get_data_from_pack(delta_obj);
955 base_data = get_base_data(base);
956 result->obj = delta_obj;
957 result->data = patch_delta(base_data, base->size,
958 delta_data, delta_obj->size, &result->size);
959 free(delta_data);
960 if (!result->data)
961 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
962 hash_object_file(result->data, result->size,
963 type_name(delta_obj->real_type), &delta_obj->idx.oid);
964 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
965 &delta_obj->idx.oid);
966 counter_lock();
967 nr_resolved_deltas++;
968 counter_unlock();
969 }
970
971 /*
972 * Standard boolean compare-and-swap: atomically check whether "*type" is
973 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
974 * and return false.
975 */
976 static int compare_and_swap_type(signed char *type,
977 enum object_type want,
978 enum object_type set)
979 {
980 enum object_type old;
981
982 type_cas_lock();
983 old = *type;
984 if (old == want)
985 *type = set;
986 type_cas_unlock();
987
988 return old == want;
989 }
990
991 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
992 struct base_data *prev_base)
993 {
994 if (base->ref_last == -1 && base->ofs_last == -1) {
995 find_ref_delta_children(base->obj->idx.oid.hash,
996 &base->ref_first, &base->ref_last,
997 OBJ_REF_DELTA);
998
999 find_ofs_delta_children(base->obj->idx.offset,
1000 &base->ofs_first, &base->ofs_last,
1001 OBJ_OFS_DELTA);
1002
1003 if (base->ref_last == -1 && base->ofs_last == -1) {
1004 free(base->data);
1005 return NULL;
1006 }
1007
1008 link_base_data(prev_base, base);
1009 }
1010
1011 if (base->ref_first <= base->ref_last) {
1012 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1013 struct base_data *result = alloc_base_data();
1014
1015 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1016 base->obj->real_type))
1017 die("BUG: child->real_type != OBJ_REF_DELTA");
1018
1019 resolve_delta(child, base, result);
1020 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1021 free_base_data(base);
1022
1023 base->ref_first++;
1024 return result;
1025 }
1026
1027 if (base->ofs_first <= base->ofs_last) {
1028 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1029 struct base_data *result = alloc_base_data();
1030
1031 assert(child->real_type == OBJ_OFS_DELTA);
1032 child->real_type = base->obj->real_type;
1033 resolve_delta(child, base, result);
1034 if (base->ofs_first == base->ofs_last)
1035 free_base_data(base);
1036
1037 base->ofs_first++;
1038 return result;
1039 }
1040
1041 unlink_base_data(base);
1042 return NULL;
1043 }
1044
1045 static void find_unresolved_deltas(struct base_data *base)
1046 {
1047 struct base_data *new_base, *prev_base = NULL;
1048 for (;;) {
1049 new_base = find_unresolved_deltas_1(base, prev_base);
1050
1051 if (new_base) {
1052 prev_base = base;
1053 base = new_base;
1054 } else {
1055 free(base);
1056 base = prev_base;
1057 if (!base)
1058 return;
1059 prev_base = base->base;
1060 }
1061 }
1062 }
1063
1064 static int compare_ofs_delta_entry(const void *a, const void *b)
1065 {
1066 const struct ofs_delta_entry *delta_a = a;
1067 const struct ofs_delta_entry *delta_b = b;
1068
1069 return delta_a->offset < delta_b->offset ? -1 :
1070 delta_a->offset > delta_b->offset ? 1 :
1071 0;
1072 }
1073
1074 static int compare_ref_delta_entry(const void *a, const void *b)
1075 {
1076 const struct ref_delta_entry *delta_a = a;
1077 const struct ref_delta_entry *delta_b = b;
1078
1079 return hashcmp(delta_a->sha1, delta_b->sha1);
1080 }
1081
1082 static void resolve_base(struct object_entry *obj)
1083 {
1084 struct base_data *base_obj = alloc_base_data();
1085 base_obj->obj = obj;
1086 base_obj->data = NULL;
1087 find_unresolved_deltas(base_obj);
1088 }
1089
1090 #ifndef NO_PTHREADS
1091 static void *threaded_second_pass(void *data)
1092 {
1093 set_thread_data(data);
1094 for (;;) {
1095 int i;
1096 counter_lock();
1097 display_progress(progress, nr_resolved_deltas);
1098 counter_unlock();
1099 work_lock();
1100 while (nr_dispatched < nr_objects &&
1101 is_delta_type(objects[nr_dispatched].type))
1102 nr_dispatched++;
1103 if (nr_dispatched >= nr_objects) {
1104 work_unlock();
1105 break;
1106 }
1107 i = nr_dispatched++;
1108 work_unlock();
1109
1110 resolve_base(&objects[i]);
1111 }
1112 return NULL;
1113 }
1114 #endif
1115
1116 /*
1117 * First pass:
1118 * - find locations of all objects;
1119 * - calculate SHA1 of all non-delta objects;
1120 * - remember base (SHA1 or offset) for all deltas.
1121 */
1122 static void parse_pack_objects(unsigned char *hash)
1123 {
1124 int i, nr_delays = 0;
1125 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1126 struct object_id ref_delta_oid;
1127 struct stat st;
1128
1129 if (verbose)
1130 progress = start_progress(
1131 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1132 nr_objects);
1133 for (i = 0; i < nr_objects; i++) {
1134 struct object_entry *obj = &objects[i];
1135 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1136 &ref_delta_oid,
1137 &obj->idx.oid);
1138 obj->real_type = obj->type;
1139 if (obj->type == OBJ_OFS_DELTA) {
1140 nr_ofs_deltas++;
1141 ofs_delta->obj_no = i;
1142 ofs_delta++;
1143 } else if (obj->type == OBJ_REF_DELTA) {
1144 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1145 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_oid.hash);
1146 ref_deltas[nr_ref_deltas].obj_no = i;
1147 nr_ref_deltas++;
1148 } else if (!data) {
1149 /* large blobs, check later */
1150 obj->real_type = OBJ_BAD;
1151 nr_delays++;
1152 } else
1153 sha1_object(data, NULL, obj->size, obj->type,
1154 &obj->idx.oid);
1155 free(data);
1156 display_progress(progress, i+1);
1157 }
1158 objects[i].idx.offset = consumed_bytes;
1159 stop_progress(&progress);
1160
1161 /* Check pack integrity */
1162 flush();
1163 the_hash_algo->final_fn(hash, &input_ctx);
1164 if (hashcmp(fill(the_hash_algo->rawsz), hash))
1165 die(_("pack is corrupted (SHA1 mismatch)"));
1166 use(the_hash_algo->rawsz);
1167
1168 /* If input_fd is a file, we should have reached its end now. */
1169 if (fstat(input_fd, &st))
1170 die_errno(_("cannot fstat packfile"));
1171 if (S_ISREG(st.st_mode) &&
1172 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1173 die(_("pack has junk at the end"));
1174
1175 for (i = 0; i < nr_objects; i++) {
1176 struct object_entry *obj = &objects[i];
1177 if (obj->real_type != OBJ_BAD)
1178 continue;
1179 obj->real_type = obj->type;
1180 sha1_object(NULL, obj, obj->size, obj->type,
1181 &obj->idx.oid);
1182 nr_delays--;
1183 }
1184 if (nr_delays)
1185 die(_("confusion beyond insanity in parse_pack_objects()"));
1186 }
1187
1188 /*
1189 * Second pass:
1190 * - for all non-delta objects, look if it is used as a base for
1191 * deltas;
1192 * - if used as a base, uncompress the object and apply all deltas,
1193 * recursively checking if the resulting object is used as a base
1194 * for some more deltas.
1195 */
1196 static void resolve_deltas(void)
1197 {
1198 int i;
1199
1200 if (!nr_ofs_deltas && !nr_ref_deltas)
1201 return;
1202
1203 /* Sort deltas by base SHA1/offset for fast searching */
1204 QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
1205 QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
1206
1207 if (verbose || show_resolving_progress)
1208 progress = start_progress(_("Resolving deltas"),
1209 nr_ref_deltas + nr_ofs_deltas);
1210
1211 #ifndef NO_PTHREADS
1212 nr_dispatched = 0;
1213 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1214 init_thread();
1215 for (i = 0; i < nr_threads; i++) {
1216 int ret = pthread_create(&thread_data[i].thread, NULL,
1217 threaded_second_pass, thread_data + i);
1218 if (ret)
1219 die(_("unable to create thread: %s"),
1220 strerror(ret));
1221 }
1222 for (i = 0; i < nr_threads; i++)
1223 pthread_join(thread_data[i].thread, NULL);
1224 cleanup_thread();
1225 return;
1226 }
1227 #endif
1228
1229 for (i = 0; i < nr_objects; i++) {
1230 struct object_entry *obj = &objects[i];
1231
1232 if (is_delta_type(obj->type))
1233 continue;
1234 resolve_base(obj);
1235 display_progress(progress, nr_resolved_deltas);
1236 }
1237 }
1238
1239 /*
1240 * Third pass:
1241 * - append objects to convert thin pack to full pack if required
1242 * - write the final pack hash
1243 */
1244 static void fix_unresolved_deltas(struct hashfile *f);
1245 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_hash)
1246 {
1247 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1248 stop_progress(&progress);
1249 /* Flush remaining pack final hash. */
1250 flush();
1251 return;
1252 }
1253
1254 if (fix_thin_pack) {
1255 struct hashfile *f;
1256 unsigned char read_hash[GIT_MAX_RAWSZ], tail_hash[GIT_MAX_RAWSZ];
1257 struct strbuf msg = STRBUF_INIT;
1258 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1259 int nr_objects_initial = nr_objects;
1260 if (nr_unresolved <= 0)
1261 die(_("confusion beyond insanity"));
1262 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1263 memset(objects + nr_objects + 1, 0,
1264 nr_unresolved * sizeof(*objects));
1265 f = hashfd(output_fd, curr_pack);
1266 fix_unresolved_deltas(f);
1267 strbuf_addf(&msg, Q_("completed with %d local object",
1268 "completed with %d local objects",
1269 nr_objects - nr_objects_initial),
1270 nr_objects - nr_objects_initial);
1271 stop_progress_msg(&progress, msg.buf);
1272 strbuf_release(&msg);
1273 hashclose(f, tail_hash, 0);
1274 hashcpy(read_hash, pack_hash);
1275 fixup_pack_header_footer(output_fd, pack_hash,
1276 curr_pack, nr_objects,
1277 read_hash, consumed_bytes-the_hash_algo->rawsz);
1278 if (hashcmp(read_hash, tail_hash) != 0)
1279 die(_("Unexpected tail checksum for %s "
1280 "(disk corruption?)"), curr_pack);
1281 }
1282 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1283 die(Q_("pack has %d unresolved delta",
1284 "pack has %d unresolved deltas",
1285 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1286 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1287 }
1288
1289 static int write_compressed(struct hashfile *f, void *in, unsigned int size)
1290 {
1291 git_zstream stream;
1292 int status;
1293 unsigned char outbuf[4096];
1294
1295 git_deflate_init(&stream, zlib_compression_level);
1296 stream.next_in = in;
1297 stream.avail_in = size;
1298
1299 do {
1300 stream.next_out = outbuf;
1301 stream.avail_out = sizeof(outbuf);
1302 status = git_deflate(&stream, Z_FINISH);
1303 hashwrite(f, outbuf, sizeof(outbuf) - stream.avail_out);
1304 } while (status == Z_OK);
1305
1306 if (status != Z_STREAM_END)
1307 die(_("unable to deflate appended object (%d)"), status);
1308 size = stream.total_out;
1309 git_deflate_end(&stream);
1310 return size;
1311 }
1312
1313 static struct object_entry *append_obj_to_pack(struct hashfile *f,
1314 const unsigned char *sha1, void *buf,
1315 unsigned long size, enum object_type type)
1316 {
1317 struct object_entry *obj = &objects[nr_objects++];
1318 unsigned char header[10];
1319 unsigned long s = size;
1320 int n = 0;
1321 unsigned char c = (type << 4) | (s & 15);
1322 s >>= 4;
1323 while (s) {
1324 header[n++] = c | 0x80;
1325 c = s & 0x7f;
1326 s >>= 7;
1327 }
1328 header[n++] = c;
1329 crc32_begin(f);
1330 hashwrite(f, header, n);
1331 obj[0].size = size;
1332 obj[0].hdr_size = n;
1333 obj[0].type = type;
1334 obj[0].real_type = type;
1335 obj[1].idx.offset = obj[0].idx.offset + n;
1336 obj[1].idx.offset += write_compressed(f, buf, size);
1337 obj[0].idx.crc32 = crc32_end(f);
1338 hashflush(f);
1339 hashcpy(obj->idx.oid.hash, sha1);
1340 return obj;
1341 }
1342
1343 static int delta_pos_compare(const void *_a, const void *_b)
1344 {
1345 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1346 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1347 return a->obj_no - b->obj_no;
1348 }
1349
1350 static void fix_unresolved_deltas(struct hashfile *f)
1351 {
1352 struct ref_delta_entry **sorted_by_pos;
1353 int i;
1354
1355 /*
1356 * Since many unresolved deltas may well be themselves base objects
1357 * for more unresolved deltas, we really want to include the
1358 * smallest number of base objects that would cover as much delta
1359 * as possible by picking the
1360 * trunc deltas first, allowing for other deltas to resolve without
1361 * additional base objects. Since most base objects are to be found
1362 * before deltas depending on them, a good heuristic is to start
1363 * resolving deltas in the same order as their position in the pack.
1364 */
1365 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1366 for (i = 0; i < nr_ref_deltas; i++)
1367 sorted_by_pos[i] = &ref_deltas[i];
1368 QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
1369
1370 for (i = 0; i < nr_ref_deltas; i++) {
1371 struct ref_delta_entry *d = sorted_by_pos[i];
1372 enum object_type type;
1373 struct base_data *base_obj = alloc_base_data();
1374
1375 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1376 continue;
1377 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1378 if (!base_obj->data)
1379 continue;
1380
1381 if (check_sha1_signature(d->sha1, base_obj->data,
1382 base_obj->size, type_name(type)))
1383 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1384 base_obj->obj = append_obj_to_pack(f, d->sha1,
1385 base_obj->data, base_obj->size, type);
1386 find_unresolved_deltas(base_obj);
1387 display_progress(progress, nr_resolved_deltas);
1388 }
1389 free(sorted_by_pos);
1390 }
1391
1392 static const char *derive_filename(const char *pack_name, const char *suffix,
1393 struct strbuf *buf)
1394 {
1395 size_t len;
1396 if (!strip_suffix(pack_name, ".pack", &len))
1397 die(_("packfile name '%s' does not end with '.pack'"),
1398 pack_name);
1399 strbuf_add(buf, pack_name, len);
1400 strbuf_addch(buf, '.');
1401 strbuf_addstr(buf, suffix);
1402 return buf->buf;
1403 }
1404
1405 static void write_special_file(const char *suffix, const char *msg,
1406 const char *pack_name, const unsigned char *hash,
1407 const char **report)
1408 {
1409 struct strbuf name_buf = STRBUF_INIT;
1410 const char *filename;
1411 int fd;
1412 int msg_len = strlen(msg);
1413
1414 if (pack_name)
1415 filename = derive_filename(pack_name, suffix, &name_buf);
1416 else
1417 filename = odb_pack_name(&name_buf, hash, suffix);
1418
1419 fd = odb_pack_keep(filename);
1420 if (fd < 0) {
1421 if (errno != EEXIST)
1422 die_errno(_("cannot write %s file '%s'"),
1423 suffix, filename);
1424 } else {
1425 if (msg_len > 0) {
1426 write_or_die(fd, msg, msg_len);
1427 write_or_die(fd, "\n", 1);
1428 }
1429 if (close(fd) != 0)
1430 die_errno(_("cannot close written %s file '%s'"),
1431 suffix, filename);
1432 if (report)
1433 *report = suffix;
1434 }
1435 strbuf_release(&name_buf);
1436 }
1437
1438 static void final(const char *final_pack_name, const char *curr_pack_name,
1439 const char *final_index_name, const char *curr_index_name,
1440 const char *keep_msg, const char *promisor_msg,
1441 unsigned char *hash)
1442 {
1443 const char *report = "pack";
1444 struct strbuf pack_name = STRBUF_INIT;
1445 struct strbuf index_name = STRBUF_INIT;
1446 int err;
1447
1448 if (!from_stdin) {
1449 close(input_fd);
1450 } else {
1451 fsync_or_die(output_fd, curr_pack_name);
1452 err = close(output_fd);
1453 if (err)
1454 die_errno(_("error while closing pack file"));
1455 }
1456
1457 if (keep_msg)
1458 write_special_file("keep", keep_msg, final_pack_name, hash,
1459 &report);
1460 if (promisor_msg)
1461 write_special_file("promisor", promisor_msg, final_pack_name,
1462 hash, NULL);
1463
1464 if (final_pack_name != curr_pack_name) {
1465 if (!final_pack_name)
1466 final_pack_name = odb_pack_name(&pack_name, hash, "pack");
1467 if (finalize_object_file(curr_pack_name, final_pack_name))
1468 die(_("cannot store pack file"));
1469 } else if (from_stdin)
1470 chmod(final_pack_name, 0444);
1471
1472 if (final_index_name != curr_index_name) {
1473 if (!final_index_name)
1474 final_index_name = odb_pack_name(&index_name, hash, "idx");
1475 if (finalize_object_file(curr_index_name, final_index_name))
1476 die(_("cannot store index file"));
1477 } else
1478 chmod(final_index_name, 0444);
1479
1480 if (!from_stdin) {
1481 printf("%s\n", sha1_to_hex(hash));
1482 } else {
1483 struct strbuf buf = STRBUF_INIT;
1484
1485 strbuf_addf(&buf, "%s\t%s\n", report, sha1_to_hex(hash));
1486 write_or_die(1, buf.buf, buf.len);
1487 strbuf_release(&buf);
1488
1489 /*
1490 * Let's just mimic git-unpack-objects here and write
1491 * the last part of the input buffer to stdout.
1492 */
1493 while (input_len) {
1494 err = xwrite(1, input_buffer + input_offset, input_len);
1495 if (err <= 0)
1496 break;
1497 input_len -= err;
1498 input_offset += err;
1499 }
1500 }
1501
1502 strbuf_release(&index_name);
1503 strbuf_release(&pack_name);
1504 }
1505
1506 static int git_index_pack_config(const char *k, const char *v, void *cb)
1507 {
1508 struct pack_idx_option *opts = cb;
1509
1510 if (!strcmp(k, "pack.indexversion")) {
1511 opts->version = git_config_int(k, v);
1512 if (opts->version > 2)
1513 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1514 return 0;
1515 }
1516 if (!strcmp(k, "pack.threads")) {
1517 nr_threads = git_config_int(k, v);
1518 if (nr_threads < 0)
1519 die(_("invalid number of threads specified (%d)"),
1520 nr_threads);
1521 #ifdef NO_PTHREADS
1522 if (nr_threads != 1)
1523 warning(_("no threads support, ignoring %s"), k);
1524 nr_threads = 1;
1525 #endif
1526 return 0;
1527 }
1528 return git_default_config(k, v, cb);
1529 }
1530
1531 static int cmp_uint32(const void *a_, const void *b_)
1532 {
1533 uint32_t a = *((uint32_t *)a_);
1534 uint32_t b = *((uint32_t *)b_);
1535
1536 return (a < b) ? -1 : (a != b);
1537 }
1538
1539 static void read_v2_anomalous_offsets(struct packed_git *p,
1540 struct pack_idx_option *opts)
1541 {
1542 const uint32_t *idx1, *idx2;
1543 uint32_t i;
1544
1545 /* The address of the 4-byte offset table */
1546 idx1 = (((const uint32_t *)p->index_data)
1547 + 2 /* 8-byte header */
1548 + 256 /* fan out */
1549 + 5 * p->num_objects /* 20-byte SHA-1 table */
1550 + p->num_objects /* CRC32 table */
1551 );
1552
1553 /* The address of the 8-byte offset table */
1554 idx2 = idx1 + p->num_objects;
1555
1556 for (i = 0; i < p->num_objects; i++) {
1557 uint32_t off = ntohl(idx1[i]);
1558 if (!(off & 0x80000000))
1559 continue;
1560 off = off & 0x7fffffff;
1561 check_pack_index_ptr(p, &idx2[off * 2]);
1562 if (idx2[off * 2])
1563 continue;
1564 /*
1565 * The real offset is ntohl(idx2[off * 2]) in high 4
1566 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1567 * octets. But idx2[off * 2] is Zero!!!
1568 */
1569 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1570 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1571 }
1572
1573 QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
1574 }
1575
1576 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1577 {
1578 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1579
1580 if (!p)
1581 die(_("Cannot open existing pack file '%s'"), pack_name);
1582 if (open_pack_index(p))
1583 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1584
1585 /* Read the attributes from the existing idx file */
1586 opts->version = p->index_version;
1587
1588 if (opts->version == 2)
1589 read_v2_anomalous_offsets(p, opts);
1590
1591 /*
1592 * Get rid of the idx file as we do not need it anymore.
1593 * NEEDSWORK: extract this bit from free_pack_by_name() in
1594 * sha1_file.c, perhaps? It shouldn't matter very much as we
1595 * know we haven't installed this pack (hence we never have
1596 * read anything from it).
1597 */
1598 close_pack_index(p);
1599 free(p);
1600 }
1601
1602 static void show_pack_info(int stat_only)
1603 {
1604 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1605 unsigned long *chain_histogram = NULL;
1606
1607 if (deepest_delta)
1608 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1609
1610 for (i = 0; i < nr_objects; i++) {
1611 struct object_entry *obj = &objects[i];
1612
1613 if (is_delta_type(obj->type))
1614 chain_histogram[obj_stat[i].delta_depth - 1]++;
1615 if (stat_only)
1616 continue;
1617 printf("%s %-6s %lu %lu %"PRIuMAX,
1618 oid_to_hex(&obj->idx.oid),
1619 type_name(obj->real_type), obj->size,
1620 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1621 (uintmax_t)obj->idx.offset);
1622 if (is_delta_type(obj->type)) {
1623 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1624 printf(" %u %s", obj_stat[i].delta_depth,
1625 oid_to_hex(&bobj->idx.oid));
1626 }
1627 putchar('\n');
1628 }
1629
1630 if (baseobjects)
1631 printf_ln(Q_("non delta: %d object",
1632 "non delta: %d objects",
1633 baseobjects),
1634 baseobjects);
1635 for (i = 0; i < deepest_delta; i++) {
1636 if (!chain_histogram[i])
1637 continue;
1638 printf_ln(Q_("chain length = %d: %lu object",
1639 "chain length = %d: %lu objects",
1640 chain_histogram[i]),
1641 i + 1,
1642 chain_histogram[i]);
1643 }
1644 }
1645
1646 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1647 {
1648 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1649 const char *curr_index;
1650 const char *index_name = NULL, *pack_name = NULL;
1651 const char *keep_msg = NULL;
1652 const char *promisor_msg = NULL;
1653 struct strbuf index_name_buf = STRBUF_INIT;
1654 struct pack_idx_entry **idx_objects;
1655 struct pack_idx_option opts;
1656 unsigned char pack_hash[GIT_MAX_RAWSZ];
1657 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1658 int report_end_of_input = 0;
1659
1660 /*
1661 * index-pack never needs to fetch missing objects, since it only
1662 * accesses the repo to do hash collision checks
1663 */
1664 fetch_if_missing = 0;
1665
1666 if (argc == 2 && !strcmp(argv[1], "-h"))
1667 usage(index_pack_usage);
1668
1669 check_replace_refs = 0;
1670 fsck_options.walk = mark_link;
1671
1672 reset_pack_idx_option(&opts);
1673 git_config(git_index_pack_config, &opts);
1674 if (prefix && chdir(prefix))
1675 die(_("Cannot come back to cwd"));
1676
1677 for (i = 1; i < argc; i++) {
1678 const char *arg = argv[i];
1679
1680 if (*arg == '-') {
1681 if (!strcmp(arg, "--stdin")) {
1682 from_stdin = 1;
1683 } else if (!strcmp(arg, "--fix-thin")) {
1684 fix_thin_pack = 1;
1685 } else if (skip_to_optional_arg(arg, "--strict", &arg)) {
1686 strict = 1;
1687 do_fsck_object = 1;
1688 fsck_set_msg_types(&fsck_options, arg);
1689 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1690 strict = 1;
1691 check_self_contained_and_connected = 1;
1692 } else if (!strcmp(arg, "--fsck-objects")) {
1693 do_fsck_object = 1;
1694 } else if (!strcmp(arg, "--verify")) {
1695 verify = 1;
1696 } else if (!strcmp(arg, "--verify-stat")) {
1697 verify = 1;
1698 show_stat = 1;
1699 } else if (!strcmp(arg, "--verify-stat-only")) {
1700 verify = 1;
1701 show_stat = 1;
1702 stat_only = 1;
1703 } else if (skip_to_optional_arg(arg, "--keep", &keep_msg)) {
1704 ; /* nothing to do */
1705 } else if (skip_to_optional_arg(arg, "--promisor", &promisor_msg)) {
1706 ; /* already parsed */
1707 } else if (starts_with(arg, "--threads=")) {
1708 char *end;
1709 nr_threads = strtoul(arg+10, &end, 0);
1710 if (!arg[10] || *end || nr_threads < 0)
1711 usage(index_pack_usage);
1712 #ifdef NO_PTHREADS
1713 if (nr_threads != 1)
1714 warning(_("no threads support, "
1715 "ignoring %s"), arg);
1716 nr_threads = 1;
1717 #endif
1718 } else if (starts_with(arg, "--pack_header=")) {
1719 struct pack_header *hdr;
1720 char *c;
1721
1722 hdr = (struct pack_header *)input_buffer;
1723 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1724 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1725 if (*c != ',')
1726 die(_("bad %s"), arg);
1727 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1728 if (*c)
1729 die(_("bad %s"), arg);
1730 input_len = sizeof(*hdr);
1731 } else if (!strcmp(arg, "-v")) {
1732 verbose = 1;
1733 } else if (!strcmp(arg, "--show-resolving-progress")) {
1734 show_resolving_progress = 1;
1735 } else if (!strcmp(arg, "--report-end-of-input")) {
1736 report_end_of_input = 1;
1737 } else if (!strcmp(arg, "-o")) {
1738 if (index_name || (i+1) >= argc)
1739 usage(index_pack_usage);
1740 index_name = argv[++i];
1741 } else if (starts_with(arg, "--index-version=")) {
1742 char *c;
1743 opts.version = strtoul(arg + 16, &c, 10);
1744 if (opts.version > 2)
1745 die(_("bad %s"), arg);
1746 if (*c == ',')
1747 opts.off32_limit = strtoul(c+1, &c, 0);
1748 if (*c || opts.off32_limit & 0x80000000)
1749 die(_("bad %s"), arg);
1750 } else if (skip_prefix(arg, "--max-input-size=", &arg)) {
1751 max_input_size = strtoumax(arg, NULL, 10);
1752 } else
1753 usage(index_pack_usage);
1754 continue;
1755 }
1756
1757 if (pack_name)
1758 usage(index_pack_usage);
1759 pack_name = arg;
1760 }
1761
1762 if (!pack_name && !from_stdin)
1763 usage(index_pack_usage);
1764 if (fix_thin_pack && !from_stdin)
1765 die(_("--fix-thin cannot be used without --stdin"));
1766 if (from_stdin && !startup_info->have_repository)
1767 die(_("--stdin requires a git repository"));
1768 if (!index_name && pack_name)
1769 index_name = derive_filename(pack_name, "idx", &index_name_buf);
1770
1771 if (verify) {
1772 if (!index_name)
1773 die(_("--verify with no packfile name given"));
1774 read_idx_option(&opts, index_name);
1775 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1776 }
1777 if (strict)
1778 opts.flags |= WRITE_IDX_STRICT;
1779
1780 #ifndef NO_PTHREADS
1781 if (!nr_threads) {
1782 nr_threads = online_cpus();
1783 /* An experiment showed that more threads does not mean faster */
1784 if (nr_threads > 3)
1785 nr_threads = 3;
1786 }
1787 #endif
1788
1789 curr_pack = open_pack_file(pack_name);
1790 parse_pack_header();
1791 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1792 if (show_stat)
1793 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1794 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1795 parse_pack_objects(pack_hash);
1796 if (report_end_of_input)
1797 write_in_full(2, "\0", 1);
1798 resolve_deltas();
1799 conclude_pack(fix_thin_pack, curr_pack, pack_hash);
1800 free(ofs_deltas);
1801 free(ref_deltas);
1802 if (strict)
1803 foreign_nr = check_objects();
1804
1805 if (show_stat)
1806 show_pack_info(stat_only);
1807
1808 ALLOC_ARRAY(idx_objects, nr_objects);
1809 for (i = 0; i < nr_objects; i++)
1810 idx_objects[i] = &objects[i].idx;
1811 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_hash);
1812 free(idx_objects);
1813
1814 if (!verify)
1815 final(pack_name, curr_pack,
1816 index_name, curr_index,
1817 keep_msg, promisor_msg,
1818 pack_hash);
1819 else
1820 close(input_fd);
1821 free(objects);
1822 strbuf_release(&index_name_buf);
1823 if (pack_name == NULL)
1824 free((void *) curr_pack);
1825 if (index_name == NULL)
1826 free((void *) curr_index);
1827
1828 /*
1829 * Let the caller know this pack is not self contained
1830 */
1831 if (check_self_contained_and_connected && foreign_nr)
1832 return 1;
1833
1834 return 0;
1835 }