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Merge branch 'dt/cat-file-follow-symlinks'
[git.git] / builtin / index-pack.c
blob7ea2020d821004569a6913d9cf550149032a1b96
1 #include "builtin.h"
2 #include "delta.h"
3 #include "pack.h"
4 #include "csum-file.h"
5 #include "blob.h"
6 #include "commit.h"
7 #include "tag.h"
8 #include "tree.h"
9 #include "progress.h"
10 #include "fsck.h"
11 #include "exec_cmd.h"
12 #include "streaming.h"
13 #include "thread-utils.h"
14
15 static const char index_pack_usage[] =
16 "git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
17
18 struct object_entry {
19 struct pack_idx_entry idx;
20 unsigned long size;
21 unsigned char hdr_size;
22 signed char type;
23 signed char real_type;
24 };
25
26 struct object_stat {
27 unsigned delta_depth;
28 int base_object_no;
29 };
30
31 struct base_data {
32 struct base_data *base;
33 struct base_data *child;
34 struct object_entry *obj;
35 void *data;
36 unsigned long size;
37 int ref_first, ref_last;
38 int ofs_first, ofs_last;
39 };
40
41 struct thread_local {
42 #ifndef NO_PTHREADS
43 pthread_t thread;
44 #endif
45 struct base_data *base_cache;
46 size_t base_cache_used;
47 int pack_fd;
48 };
49
50 #define FLAG_LINK (1u<<20)
51 #define FLAG_CHECKED (1u<<21)
52
53 struct ofs_delta_entry {
54 off_t offset;
55 int obj_no;
56 };
57
58 struct ref_delta_entry {
59 unsigned char sha1[20];
60 int obj_no;
61 };
62
63 static struct object_entry *objects;
64 static struct object_stat *obj_stat;
65 static struct ofs_delta_entry *ofs_deltas;
66 static struct ref_delta_entry *ref_deltas;
67 static struct thread_local nothread_data;
68 static int nr_objects;
69 static int nr_ofs_deltas;
70 static int nr_ref_deltas;
71 static int ref_deltas_alloc;
72 static int nr_resolved_deltas;
73 static int nr_threads;
74
75 static int from_stdin;
76 static int strict;
77 static int do_fsck_object;
78 static int verbose;
79 static int show_stat;
80 static int check_self_contained_and_connected;
81
82 static struct progress *progress;
83
84 /* We always read in 4kB chunks. */
85 static unsigned char input_buffer[4096];
86 static unsigned int input_offset, input_len;
87 static off_t consumed_bytes;
88 static unsigned deepest_delta;
89 static git_SHA_CTX input_ctx;
90 static uint32_t input_crc32;
91 static int input_fd, output_fd;
92 static const char *curr_pack;
93
94 #ifndef NO_PTHREADS
95
96 static struct thread_local *thread_data;
97 static int nr_dispatched;
98 static int threads_active;
99
100 static pthread_mutex_t read_mutex;
101 #define read_lock() lock_mutex(&read_mutex)
102 #define read_unlock() unlock_mutex(&read_mutex)
103
104 static pthread_mutex_t counter_mutex;
105 #define counter_lock() lock_mutex(&counter_mutex)
106 #define counter_unlock() unlock_mutex(&counter_mutex)
107
108 static pthread_mutex_t work_mutex;
109 #define work_lock() lock_mutex(&work_mutex)
110 #define work_unlock() unlock_mutex(&work_mutex)
111
112 static pthread_mutex_t deepest_delta_mutex;
113 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
114 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
115
116 static pthread_mutex_t type_cas_mutex;
117 #define type_cas_lock() lock_mutex(&type_cas_mutex)
118 #define type_cas_unlock() unlock_mutex(&type_cas_mutex)
119
120 static pthread_key_t key;
121
122 static inline void lock_mutex(pthread_mutex_t *mutex)
123 {
124 if (threads_active)
125 pthread_mutex_lock(mutex);
126 }
127
128 static inline void unlock_mutex(pthread_mutex_t *mutex)
129 {
130 if (threads_active)
131 pthread_mutex_unlock(mutex);
132 }
133
134 /*
135 * Mutex and conditional variable can't be statically-initialized on Windows.
136 */
137 static void init_thread(void)
138 {
139 int i;
140 init_recursive_mutex(&read_mutex);
141 pthread_mutex_init(&counter_mutex, NULL);
142 pthread_mutex_init(&work_mutex, NULL);
143 pthread_mutex_init(&type_cas_mutex, NULL);
144 if (show_stat)
145 pthread_mutex_init(&deepest_delta_mutex, NULL);
146 pthread_key_create(&key, NULL);
147 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
148 for (i = 0; i < nr_threads; i++) {
149 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
150 if (thread_data[i].pack_fd == -1)
151 die_errno(_("unable to open %s"), curr_pack);
152 }
153
154 threads_active = 1;
155 }
156
157 static void cleanup_thread(void)
158 {
159 int i;
160 if (!threads_active)
161 return;
162 threads_active = 0;
163 pthread_mutex_destroy(&read_mutex);
164 pthread_mutex_destroy(&counter_mutex);
165 pthread_mutex_destroy(&work_mutex);
166 pthread_mutex_destroy(&type_cas_mutex);
167 if (show_stat)
168 pthread_mutex_destroy(&deepest_delta_mutex);
169 for (i = 0; i < nr_threads; i++)
170 close(thread_data[i].pack_fd);
171 pthread_key_delete(key);
172 free(thread_data);
173 }
174
175 #else
176
177 #define read_lock()
178 #define read_unlock()
179
180 #define counter_lock()
181 #define counter_unlock()
182
183 #define work_lock()
184 #define work_unlock()
185
186 #define deepest_delta_lock()
187 #define deepest_delta_unlock()
188
189 #define type_cas_lock()
190 #define type_cas_unlock()
191
192 #endif
193
194
195 static int mark_link(struct object *obj, int type, void *data)
196 {
197 if (!obj)
198 return -1;
199
200 if (type != OBJ_ANY && obj->type != type)
201 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
202
203 obj->flags |= FLAG_LINK;
204 return 0;
205 }
206
207 /* The content of each linked object must have been checked
208 or it must be already present in the object database */
209 static unsigned check_object(struct object *obj)
210 {
211 if (!obj)
212 return 0;
213
214 if (!(obj->flags & FLAG_LINK))
215 return 0;
216
217 if (!(obj->flags & FLAG_CHECKED)) {
218 unsigned long size;
219 int type = sha1_object_info(obj->sha1, &size);
220 if (type <= 0)
221 die(_("did not receive expected object %s"),
222 sha1_to_hex(obj->sha1));
223 if (type != obj->type)
224 die(_("object %s: expected type %s, found %s"),
225 sha1_to_hex(obj->sha1),
226 typename(obj->type), typename(type));
227 obj->flags |= FLAG_CHECKED;
228 return 1;
229 }
230
231 return 0;
232 }
233
234 static unsigned check_objects(void)
235 {
236 unsigned i, max, foreign_nr = 0;
237
238 max = get_max_object_index();
239 for (i = 0; i < max; i++)
240 foreign_nr += check_object(get_indexed_object(i));
241 return foreign_nr;
242 }
243
244
245 /* Discard current buffer used content. */
246 static void flush(void)
247 {
248 if (input_offset) {
249 if (output_fd >= 0)
250 write_or_die(output_fd, input_buffer, input_offset);
251 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
252 memmove(input_buffer, input_buffer + input_offset, input_len);
253 input_offset = 0;
254 }
255 }
256
257 /*
258 * Make sure at least "min" bytes are available in the buffer, and
259 * return the pointer to the buffer.
260 */
261 static void *fill(int min)
262 {
263 if (min <= input_len)
264 return input_buffer + input_offset;
265 if (min > sizeof(input_buffer))
266 die(Q_("cannot fill %d byte",
267 "cannot fill %d bytes",
268 min),
269 min);
270 flush();
271 do {
272 ssize_t ret = xread(input_fd, input_buffer + input_len,
273 sizeof(input_buffer) - input_len);
274 if (ret <= 0) {
275 if (!ret)
276 die(_("early EOF"));
277 die_errno(_("read error on input"));
278 }
279 input_len += ret;
280 if (from_stdin)
281 display_throughput(progress, consumed_bytes + input_len);
282 } while (input_len < min);
283 return input_buffer;
284 }
285
286 static void use(int bytes)
287 {
288 if (bytes > input_len)
289 die(_("used more bytes than were available"));
290 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
291 input_len -= bytes;
292 input_offset += bytes;
293
294 /* make sure off_t is sufficiently large not to wrap */
295 if (signed_add_overflows(consumed_bytes, bytes))
296 die(_("pack too large for current definition of off_t"));
297 consumed_bytes += bytes;
298 }
299
300 static const char *open_pack_file(const char *pack_name)
301 {
302 if (from_stdin) {
303 input_fd = 0;
304 if (!pack_name) {
305 static char tmp_file[PATH_MAX];
306 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
307 "pack/tmp_pack_XXXXXX");
308 pack_name = xstrdup(tmp_file);
309 } else
310 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
311 if (output_fd < 0)
312 die_errno(_("unable to create '%s'"), pack_name);
313 nothread_data.pack_fd = output_fd;
314 } else {
315 input_fd = open(pack_name, O_RDONLY);
316 if (input_fd < 0)
317 die_errno(_("cannot open packfile '%s'"), pack_name);
318 output_fd = -1;
319 nothread_data.pack_fd = input_fd;
320 }
321 git_SHA1_Init(&input_ctx);
322 return pack_name;
323 }
324
325 static void parse_pack_header(void)
326 {
327 struct pack_header *hdr = fill(sizeof(struct pack_header));
328
329 /* Header consistency check */
330 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
331 die(_("pack signature mismatch"));
332 if (!pack_version_ok(hdr->hdr_version))
333 die(_("pack version %"PRIu32" unsupported"),
334 ntohl(hdr->hdr_version));
335
336 nr_objects = ntohl(hdr->hdr_entries);
337 use(sizeof(struct pack_header));
338 }
339
340 static NORETURN void bad_object(unsigned long offset, const char *format,
341 ...) __attribute__((format (printf, 2, 3)));
342
343 static NORETURN void bad_object(unsigned long offset, const char *format, ...)
344 {
345 va_list params;
346 char buf[1024];
347
348 va_start(params, format);
349 vsnprintf(buf, sizeof(buf), format, params);
350 va_end(params);
351 die(_("pack has bad object at offset %lu: %s"), offset, buf);
352 }
353
354 static inline struct thread_local *get_thread_data(void)
355 {
356 #ifndef NO_PTHREADS
357 if (threads_active)
358 return pthread_getspecific(key);
359 assert(!threads_active &&
360 "This should only be reached when all threads are gone");
361 #endif
362 return &nothread_data;
363 }
364
365 #ifndef NO_PTHREADS
366 static void set_thread_data(struct thread_local *data)
367 {
368 if (threads_active)
369 pthread_setspecific(key, data);
370 }
371 #endif
372
373 static struct base_data *alloc_base_data(void)
374 {
375 struct base_data *base = xcalloc(1, sizeof(struct base_data));
376 base->ref_last = -1;
377 base->ofs_last = -1;
378 return base;
379 }
380
381 static void free_base_data(struct base_data *c)
382 {
383 if (c->data) {
384 free(c->data);
385 c->data = NULL;
386 get_thread_data()->base_cache_used -= c->size;
387 }
388 }
389
390 static void prune_base_data(struct base_data *retain)
391 {
392 struct base_data *b;
393 struct thread_local *data = get_thread_data();
394 for (b = data->base_cache;
395 data->base_cache_used > delta_base_cache_limit && b;
396 b = b->child) {
397 if (b->data && b != retain)
398 free_base_data(b);
399 }
400 }
401
402 static void link_base_data(struct base_data *base, struct base_data *c)
403 {
404 if (base)
405 base->child = c;
406 else
407 get_thread_data()->base_cache = c;
408
409 c->base = base;
410 c->child = NULL;
411 if (c->data)
412 get_thread_data()->base_cache_used += c->size;
413 prune_base_data(c);
414 }
415
416 static void unlink_base_data(struct base_data *c)
417 {
418 struct base_data *base = c->base;
419 if (base)
420 base->child = NULL;
421 else
422 get_thread_data()->base_cache = NULL;
423 free_base_data(c);
424 }
425
426 static int is_delta_type(enum object_type type)
427 {
428 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
429 }
430
431 static void *unpack_entry_data(unsigned long offset, unsigned long size,
432 enum object_type type, unsigned char *sha1)
433 {
434 static char fixed_buf[8192];
435 int status;
436 git_zstream stream;
437 void *buf;
438 git_SHA_CTX c;
439 char hdr[32];
440 int hdrlen;
441
442 if (!is_delta_type(type)) {
443 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
444 git_SHA1_Init(&c);
445 git_SHA1_Update(&c, hdr, hdrlen);
446 } else
447 sha1 = NULL;
448 if (type == OBJ_BLOB && size > big_file_threshold)
449 buf = fixed_buf;
450 else
451 buf = xmallocz(size);
452
453 memset(&stream, 0, sizeof(stream));
454 git_inflate_init(&stream);
455 stream.next_out = buf;
456 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
457
458 do {
459 unsigned char *last_out = stream.next_out;
460 stream.next_in = fill(1);
461 stream.avail_in = input_len;
462 status = git_inflate(&stream, 0);
463 use(input_len - stream.avail_in);
464 if (sha1)
465 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
466 if (buf == fixed_buf) {
467 stream.next_out = buf;
468 stream.avail_out = sizeof(fixed_buf);
469 }
470 } while (status == Z_OK);
471 if (stream.total_out != size || status != Z_STREAM_END)
472 bad_object(offset, _("inflate returned %d"), status);
473 git_inflate_end(&stream);
474 if (sha1)
475 git_SHA1_Final(sha1, &c);
476 return buf == fixed_buf ? NULL : buf;
477 }
478
479 static void *unpack_raw_entry(struct object_entry *obj,
480 off_t *ofs_offset,
481 unsigned char *ref_sha1,
482 unsigned char *sha1)
483 {
484 unsigned char *p;
485 unsigned long size, c;
486 off_t base_offset;
487 unsigned shift;
488 void *data;
489
490 obj->idx.offset = consumed_bytes;
491 input_crc32 = crc32(0, NULL, 0);
492
493 p = fill(1);
494 c = *p;
495 use(1);
496 obj->type = (c >> 4) & 7;
497 size = (c & 15);
498 shift = 4;
499 while (c & 0x80) {
500 p = fill(1);
501 c = *p;
502 use(1);
503 size += (c & 0x7f) << shift;
504 shift += 7;
505 }
506 obj->size = size;
507
508 switch (obj->type) {
509 case OBJ_REF_DELTA:
510 hashcpy(ref_sha1, fill(20));
511 use(20);
512 break;
513 case OBJ_OFS_DELTA:
514 p = fill(1);
515 c = *p;
516 use(1);
517 base_offset = c & 127;
518 while (c & 128) {
519 base_offset += 1;
520 if (!base_offset || MSB(base_offset, 7))
521 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
522 p = fill(1);
523 c = *p;
524 use(1);
525 base_offset = (base_offset << 7) + (c & 127);
526 }
527 *ofs_offset = obj->idx.offset - base_offset;
528 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
529 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
530 break;
531 case OBJ_COMMIT:
532 case OBJ_TREE:
533 case OBJ_BLOB:
534 case OBJ_TAG:
535 break;
536 default:
537 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
538 }
539 obj->hdr_size = consumed_bytes - obj->idx.offset;
540
541 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
542 obj->idx.crc32 = input_crc32;
543 return data;
544 }
545
546 static void *unpack_data(struct object_entry *obj,
547 int (*consume)(const unsigned char *, unsigned long, void *),
548 void *cb_data)
549 {
550 off_t from = obj[0].idx.offset + obj[0].hdr_size;
551 unsigned long len = obj[1].idx.offset - from;
552 unsigned char *data, *inbuf;
553 git_zstream stream;
554 int status;
555
556 data = xmallocz(consume ? 64*1024 : obj->size);
557 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
558
559 memset(&stream, 0, sizeof(stream));
560 git_inflate_init(&stream);
561 stream.next_out = data;
562 stream.avail_out = consume ? 64*1024 : obj->size;
563
564 do {
565 ssize_t n = (len < 64*1024) ? len : 64*1024;
566 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
567 if (n < 0)
568 die_errno(_("cannot pread pack file"));
569 if (!n)
570 die(Q_("premature end of pack file, %lu byte missing",
571 "premature end of pack file, %lu bytes missing",
572 len),
573 len);
574 from += n;
575 len -= n;
576 stream.next_in = inbuf;
577 stream.avail_in = n;
578 if (!consume)
579 status = git_inflate(&stream, 0);
580 else {
581 do {
582 status = git_inflate(&stream, 0);
583 if (consume(data, stream.next_out - data, cb_data)) {
584 free(inbuf);
585 free(data);
586 return NULL;
587 }
588 stream.next_out = data;
589 stream.avail_out = 64*1024;
590 } while (status == Z_OK && stream.avail_in);
591 }
592 } while (len && status == Z_OK && !stream.avail_in);
593
594 /* This has been inflated OK when first encountered, so... */
595 if (status != Z_STREAM_END || stream.total_out != obj->size)
596 die(_("serious inflate inconsistency"));
597
598 git_inflate_end(&stream);
599 free(inbuf);
600 if (consume) {
601 free(data);
602 data = NULL;
603 }
604 return data;
605 }
606
607 static void *get_data_from_pack(struct object_entry *obj)
608 {
609 return unpack_data(obj, NULL, NULL);
610 }
611
612 static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
613 enum object_type type1,
614 enum object_type type2)
615 {
616 int cmp = type1 - type2;
617 if (cmp)
618 return cmp;
619 return offset1 - offset2;
620 }
621
622 static int find_ofs_delta(const off_t offset, enum object_type type)
623 {
624 int first = 0, last = nr_ofs_deltas;
625
626 while (first < last) {
627 int next = (first + last) / 2;
628 struct ofs_delta_entry *delta = &ofs_deltas[next];
629 int cmp;
630
631 cmp = compare_ofs_delta_bases(offset, delta->offset,
632 type, objects[delta->obj_no].type);
633 if (!cmp)
634 return next;
635 if (cmp < 0) {
636 last = next;
637 continue;
638 }
639 first = next+1;
640 }
641 return -first-1;
642 }
643
644 static void find_ofs_delta_children(off_t offset,
645 int *first_index, int *last_index,
646 enum object_type type)
647 {
648 int first = find_ofs_delta(offset, type);
649 int last = first;
650 int end = nr_ofs_deltas - 1;
651
652 if (first < 0) {
653 *first_index = 0;
654 *last_index = -1;
655 return;
656 }
657 while (first > 0 && ofs_deltas[first - 1].offset == offset)
658 --first;
659 while (last < end && ofs_deltas[last + 1].offset == offset)
660 ++last;
661 *first_index = first;
662 *last_index = last;
663 }
664
665 static int compare_ref_delta_bases(const unsigned char *sha1,
666 const unsigned char *sha2,
667 enum object_type type1,
668 enum object_type type2)
669 {
670 int cmp = type1 - type2;
671 if (cmp)
672 return cmp;
673 return hashcmp(sha1, sha2);
674 }
675
676 static int find_ref_delta(const unsigned char *sha1, enum object_type type)
677 {
678 int first = 0, last = nr_ref_deltas;
679
680 while (first < last) {
681 int next = (first + last) / 2;
682 struct ref_delta_entry *delta = &ref_deltas[next];
683 int cmp;
684
685 cmp = compare_ref_delta_bases(sha1, delta->sha1,
686 type, objects[delta->obj_no].type);
687 if (!cmp)
688 return next;
689 if (cmp < 0) {
690 last = next;
691 continue;
692 }
693 first = next+1;
694 }
695 return -first-1;
696 }
697
698 static void find_ref_delta_children(const unsigned char *sha1,
699 int *first_index, int *last_index,
700 enum object_type type)
701 {
702 int first = find_ref_delta(sha1, type);
703 int last = first;
704 int end = nr_ref_deltas - 1;
705
706 if (first < 0) {
707 *first_index = 0;
708 *last_index = -1;
709 return;
710 }
711 while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
712 --first;
713 while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
714 ++last;
715 *first_index = first;
716 *last_index = last;
717 }
718
719 struct compare_data {
720 struct object_entry *entry;
721 struct git_istream *st;
722 unsigned char *buf;
723 unsigned long buf_size;
724 };
725
726 static int compare_objects(const unsigned char *buf, unsigned long size,
727 void *cb_data)
728 {
729 struct compare_data *data = cb_data;
730
731 if (data->buf_size < size) {
732 free(data->buf);
733 data->buf = xmalloc(size);
734 data->buf_size = size;
735 }
736
737 while (size) {
738 ssize_t len = read_istream(data->st, data->buf, size);
739 if (len == 0)
740 die(_("SHA1 COLLISION FOUND WITH %s !"),
741 sha1_to_hex(data->entry->idx.sha1));
742 if (len < 0)
743 die(_("unable to read %s"),
744 sha1_to_hex(data->entry->idx.sha1));
745 if (memcmp(buf, data->buf, len))
746 die(_("SHA1 COLLISION FOUND WITH %s !"),
747 sha1_to_hex(data->entry->idx.sha1));
748 size -= len;
749 buf += len;
750 }
751 return 0;
752 }
753
754 static int check_collison(struct object_entry *entry)
755 {
756 struct compare_data data;
757 enum object_type type;
758 unsigned long size;
759
760 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
761 return -1;
762
763 memset(&data, 0, sizeof(data));
764 data.entry = entry;
765 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
766 if (!data.st)
767 return -1;
768 if (size != entry->size || type != entry->type)
769 die(_("SHA1 COLLISION FOUND WITH %s !"),
770 sha1_to_hex(entry->idx.sha1));
771 unpack_data(entry, compare_objects, &data);
772 close_istream(data.st);
773 free(data.buf);
774 return 0;
775 }
776
777 static void sha1_object(const void *data, struct object_entry *obj_entry,
778 unsigned long size, enum object_type type,
779 const unsigned char *sha1)
780 {
781 void *new_data = NULL;
782 int collision_test_needed;
783
784 assert(data || obj_entry);
785
786 read_lock();
787 collision_test_needed = has_sha1_file(sha1);
788 read_unlock();
789
790 if (collision_test_needed && !data) {
791 read_lock();
792 if (!check_collison(obj_entry))
793 collision_test_needed = 0;
794 read_unlock();
795 }
796 if (collision_test_needed) {
797 void *has_data;
798 enum object_type has_type;
799 unsigned long has_size;
800 read_lock();
801 has_type = sha1_object_info(sha1, &has_size);
802 if (has_type != type || has_size != size)
803 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
804 has_data = read_sha1_file(sha1, &has_type, &has_size);
805 read_unlock();
806 if (!data)
807 data = new_data = get_data_from_pack(obj_entry);
808 if (!has_data)
809 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
810 if (size != has_size || type != has_type ||
811 memcmp(data, has_data, size) != 0)
812 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
813 free(has_data);
814 }
815
816 if (strict) {
817 read_lock();
818 if (type == OBJ_BLOB) {
819 struct blob *blob = lookup_blob(sha1);
820 if (blob)
821 blob->object.flags |= FLAG_CHECKED;
822 else
823 die(_("invalid blob object %s"), sha1_to_hex(sha1));
824 } else {
825 struct object *obj;
826 int eaten;
827 void *buf = (void *) data;
828
829 assert(data && "data can only be NULL for large _blobs_");
830
831 /*
832 * we do not need to free the memory here, as the
833 * buf is deleted by the caller.
834 */
835 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
836 if (!obj)
837 die(_("invalid %s"), typename(type));
838 if (do_fsck_object &&
839 fsck_object(obj, buf, size, 1,
840 fsck_error_function))
841 die(_("Error in object"));
842 if (fsck_walk(obj, mark_link, NULL))
843 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
844
845 if (obj->type == OBJ_TREE) {
846 struct tree *item = (struct tree *) obj;
847 item->buffer = NULL;
848 obj->parsed = 0;
849 }
850 if (obj->type == OBJ_COMMIT) {
851 struct commit *commit = (struct commit *) obj;
852 if (detach_commit_buffer(commit, NULL) != data)
853 die("BUG: parse_object_buffer transmogrified our buffer");
854 }
855 obj->flags |= FLAG_CHECKED;
856 }
857 read_unlock();
858 }
859
860 free(new_data);
861 }
862
863 /*
864 * This function is part of find_unresolved_deltas(). There are two
865 * walkers going in the opposite ways.
866 *
867 * The first one in find_unresolved_deltas() traverses down from
868 * parent node to children, deflating nodes along the way. However,
869 * memory for deflated nodes is limited by delta_base_cache_limit, so
870 * at some point parent node's deflated content may be freed.
871 *
872 * The second walker is this function, which goes from current node up
873 * to top parent if necessary to deflate the node. In normal
874 * situation, its parent node would be already deflated, so it just
875 * needs to apply delta.
876 *
877 * In the worst case scenario, parent node is no longer deflated because
878 * we're running out of delta_base_cache_limit; we need to re-deflate
879 * parents, possibly up to the top base.
880 *
881 * All deflated objects here are subject to be freed if we exceed
882 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
883 * just need to make sure the last node is not freed.
884 */
885 static void *get_base_data(struct base_data *c)
886 {
887 if (!c->data) {
888 struct object_entry *obj = c->obj;
889 struct base_data **delta = NULL;
890 int delta_nr = 0, delta_alloc = 0;
891
892 while (is_delta_type(c->obj->type) && !c->data) {
893 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
894 delta[delta_nr++] = c;
895 c = c->base;
896 }
897 if (!delta_nr) {
898 c->data = get_data_from_pack(obj);
899 c->size = obj->size;
900 get_thread_data()->base_cache_used += c->size;
901 prune_base_data(c);
902 }
903 for (; delta_nr > 0; delta_nr--) {
904 void *base, *raw;
905 c = delta[delta_nr - 1];
906 obj = c->obj;
907 base = get_base_data(c->base);
908 raw = get_data_from_pack(obj);
909 c->data = patch_delta(
910 base, c->base->size,
911 raw, obj->size,
912 &c->size);
913 free(raw);
914 if (!c->data)
915 bad_object(obj->idx.offset, _("failed to apply delta"));
916 get_thread_data()->base_cache_used += c->size;
917 prune_base_data(c);
918 }
919 free(delta);
920 }
921 return c->data;
922 }
923
924 static void resolve_delta(struct object_entry *delta_obj,
925 struct base_data *base, struct base_data *result)
926 {
927 void *base_data, *delta_data;
928
929 if (show_stat) {
930 int i = delta_obj - objects;
931 int j = base->obj - objects;
932 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
933 deepest_delta_lock();
934 if (deepest_delta < obj_stat[i].delta_depth)
935 deepest_delta = obj_stat[i].delta_depth;
936 deepest_delta_unlock();
937 obj_stat[i].base_object_no = j;
938 }
939 delta_data = get_data_from_pack(delta_obj);
940 base_data = get_base_data(base);
941 result->obj = delta_obj;
942 result->data = patch_delta(base_data, base->size,
943 delta_data, delta_obj->size, &result->size);
944 free(delta_data);
945 if (!result->data)
946 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
947 hash_sha1_file(result->data, result->size,
948 typename(delta_obj->real_type), delta_obj->idx.sha1);
949 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
950 delta_obj->idx.sha1);
951 counter_lock();
952 nr_resolved_deltas++;
953 counter_unlock();
954 }
955
956 /*
957 * Standard boolean compare-and-swap: atomically check whether "*type" is
958 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
959 * and return false.
960 */
961 static int compare_and_swap_type(signed char *type,
962 enum object_type want,
963 enum object_type set)
964 {
965 enum object_type old;
966
967 type_cas_lock();
968 old = *type;
969 if (old == want)
970 *type = set;
971 type_cas_unlock();
972
973 return old == want;
974 }
975
976 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
977 struct base_data *prev_base)
978 {
979 if (base->ref_last == -1 && base->ofs_last == -1) {
980 find_ref_delta_children(base->obj->idx.sha1,
981 &base->ref_first, &base->ref_last,
982 OBJ_REF_DELTA);
983
984 find_ofs_delta_children(base->obj->idx.offset,
985 &base->ofs_first, &base->ofs_last,
986 OBJ_OFS_DELTA);
987
988 if (base->ref_last == -1 && base->ofs_last == -1) {
989 free(base->data);
990 return NULL;
991 }
992
993 link_base_data(prev_base, base);
994 }
995
996 if (base->ref_first <= base->ref_last) {
997 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
998 struct base_data *result = alloc_base_data();
999
1000 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1001 base->obj->real_type))
1002 die("BUG: child->real_type != OBJ_REF_DELTA");
1003
1004 resolve_delta(child, base, result);
1005 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1006 free_base_data(base);
1007
1008 base->ref_first++;
1009 return result;
1010 }
1011
1012 if (base->ofs_first <= base->ofs_last) {
1013 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1014 struct base_data *result = alloc_base_data();
1015
1016 assert(child->real_type == OBJ_OFS_DELTA);
1017 child->real_type = base->obj->real_type;
1018 resolve_delta(child, base, result);
1019 if (base->ofs_first == base->ofs_last)
1020 free_base_data(base);
1021
1022 base->ofs_first++;
1023 return result;
1024 }
1025
1026 unlink_base_data(base);
1027 return NULL;
1028 }
1029
1030 static void find_unresolved_deltas(struct base_data *base)
1031 {
1032 struct base_data *new_base, *prev_base = NULL;
1033 for (;;) {
1034 new_base = find_unresolved_deltas_1(base, prev_base);
1035
1036 if (new_base) {
1037 prev_base = base;
1038 base = new_base;
1039 } else {
1040 free(base);
1041 base = prev_base;
1042 if (!base)
1043 return;
1044 prev_base = base->base;
1045 }
1046 }
1047 }
1048
1049 static int compare_ofs_delta_entry(const void *a, const void *b)
1050 {
1051 const struct ofs_delta_entry *delta_a = a;
1052 const struct ofs_delta_entry *delta_b = b;
1053
1054 return delta_a->offset - delta_b->offset;
1055 }
1056
1057 static int compare_ref_delta_entry(const void *a, const void *b)
1058 {
1059 const struct ref_delta_entry *delta_a = a;
1060 const struct ref_delta_entry *delta_b = b;
1061
1062 return hashcmp(delta_a->sha1, delta_b->sha1);
1063 }
1064
1065 static void resolve_base(struct object_entry *obj)
1066 {
1067 struct base_data *base_obj = alloc_base_data();
1068 base_obj->obj = obj;
1069 base_obj->data = NULL;
1070 find_unresolved_deltas(base_obj);
1071 }
1072
1073 #ifndef NO_PTHREADS
1074 static void *threaded_second_pass(void *data)
1075 {
1076 set_thread_data(data);
1077 for (;;) {
1078 int i;
1079 counter_lock();
1080 display_progress(progress, nr_resolved_deltas);
1081 counter_unlock();
1082 work_lock();
1083 while (nr_dispatched < nr_objects &&
1084 is_delta_type(objects[nr_dispatched].type))
1085 nr_dispatched++;
1086 if (nr_dispatched >= nr_objects) {
1087 work_unlock();
1088 break;
1089 }
1090 i = nr_dispatched++;
1091 work_unlock();
1092
1093 resolve_base(&objects[i]);
1094 }
1095 return NULL;
1096 }
1097 #endif
1098
1099 /*
1100 * First pass:
1101 * - find locations of all objects;
1102 * - calculate SHA1 of all non-delta objects;
1103 * - remember base (SHA1 or offset) for all deltas.
1104 */
1105 static void parse_pack_objects(unsigned char *sha1)
1106 {
1107 int i, nr_delays = 0;
1108 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1109 unsigned char ref_delta_sha1[20];
1110 struct stat st;
1111
1112 if (verbose)
1113 progress = start_progress(
1114 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1115 nr_objects);
1116 for (i = 0; i < nr_objects; i++) {
1117 struct object_entry *obj = &objects[i];
1118 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1119 ref_delta_sha1, obj->idx.sha1);
1120 obj->real_type = obj->type;
1121 if (obj->type == OBJ_OFS_DELTA) {
1122 nr_ofs_deltas++;
1123 ofs_delta->obj_no = i;
1124 ofs_delta++;
1125 } else if (obj->type == OBJ_REF_DELTA) {
1126 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1127 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_sha1);
1128 ref_deltas[nr_ref_deltas].obj_no = i;
1129 nr_ref_deltas++;
1130 } else if (!data) {
1131 /* large blobs, check later */
1132 obj->real_type = OBJ_BAD;
1133 nr_delays++;
1134 } else
1135 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1136 free(data);
1137 display_progress(progress, i+1);
1138 }
1139 objects[i].idx.offset = consumed_bytes;
1140 stop_progress(&progress);
1141
1142 /* Check pack integrity */
1143 flush();
1144 git_SHA1_Final(sha1, &input_ctx);
1145 if (hashcmp(fill(20), sha1))
1146 die(_("pack is corrupted (SHA1 mismatch)"));
1147 use(20);
1148
1149 /* If input_fd is a file, we should have reached its end now. */
1150 if (fstat(input_fd, &st))
1151 die_errno(_("cannot fstat packfile"));
1152 if (S_ISREG(st.st_mode) &&
1153 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1154 die(_("pack has junk at the end"));
1155
1156 for (i = 0; i < nr_objects; i++) {
1157 struct object_entry *obj = &objects[i];
1158 if (obj->real_type != OBJ_BAD)
1159 continue;
1160 obj->real_type = obj->type;
1161 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1162 nr_delays--;
1163 }
1164 if (nr_delays)
1165 die(_("confusion beyond insanity in parse_pack_objects()"));
1166 }
1167
1168 /*
1169 * Second pass:
1170 * - for all non-delta objects, look if it is used as a base for
1171 * deltas;
1172 * - if used as a base, uncompress the object and apply all deltas,
1173 * recursively checking if the resulting object is used as a base
1174 * for some more deltas.
1175 */
1176 static void resolve_deltas(void)
1177 {
1178 int i;
1179
1180 if (!nr_ofs_deltas && !nr_ref_deltas)
1181 return;
1182
1183 /* Sort deltas by base SHA1/offset for fast searching */
1184 qsort(ofs_deltas, nr_ofs_deltas, sizeof(struct ofs_delta_entry),
1185 compare_ofs_delta_entry);
1186 qsort(ref_deltas, nr_ref_deltas, sizeof(struct ref_delta_entry),
1187 compare_ref_delta_entry);
1188
1189 if (verbose)
1190 progress = start_progress(_("Resolving deltas"),
1191 nr_ref_deltas + nr_ofs_deltas);
1192
1193 #ifndef NO_PTHREADS
1194 nr_dispatched = 0;
1195 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1196 init_thread();
1197 for (i = 0; i < nr_threads; i++) {
1198 int ret = pthread_create(&thread_data[i].thread, NULL,
1199 threaded_second_pass, thread_data + i);
1200 if (ret)
1201 die(_("unable to create thread: %s"),
1202 strerror(ret));
1203 }
1204 for (i = 0; i < nr_threads; i++)
1205 pthread_join(thread_data[i].thread, NULL);
1206 cleanup_thread();
1207 return;
1208 }
1209 #endif
1210
1211 for (i = 0; i < nr_objects; i++) {
1212 struct object_entry *obj = &objects[i];
1213
1214 if (is_delta_type(obj->type))
1215 continue;
1216 resolve_base(obj);
1217 display_progress(progress, nr_resolved_deltas);
1218 }
1219 }
1220
1221 /*
1222 * Third pass:
1223 * - append objects to convert thin pack to full pack if required
1224 * - write the final 20-byte SHA-1
1225 */
1226 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1227 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1228 {
1229 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1230 stop_progress(&progress);
1231 /* Flush remaining pack final 20-byte SHA1. */
1232 flush();
1233 return;
1234 }
1235
1236 if (fix_thin_pack) {
1237 struct sha1file *f;
1238 unsigned char read_sha1[20], tail_sha1[20];
1239 struct strbuf msg = STRBUF_INIT;
1240 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1241 int nr_objects_initial = nr_objects;
1242 if (nr_unresolved <= 0)
1243 die(_("confusion beyond insanity"));
1244 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1245 memset(objects + nr_objects + 1, 0,
1246 nr_unresolved * sizeof(*objects));
1247 f = sha1fd(output_fd, curr_pack);
1248 fix_unresolved_deltas(f, nr_unresolved);
1249 strbuf_addf(&msg, _("completed with %d local objects"),
1250 nr_objects - nr_objects_initial);
1251 stop_progress_msg(&progress, msg.buf);
1252 strbuf_release(&msg);
1253 sha1close(f, tail_sha1, 0);
1254 hashcpy(read_sha1, pack_sha1);
1255 fixup_pack_header_footer(output_fd, pack_sha1,
1256 curr_pack, nr_objects,
1257 read_sha1, consumed_bytes-20);
1258 if (hashcmp(read_sha1, tail_sha1) != 0)
1259 die(_("Unexpected tail checksum for %s "
1260 "(disk corruption?)"), curr_pack);
1261 }
1262 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1263 die(Q_("pack has %d unresolved delta",
1264 "pack has %d unresolved deltas",
1265 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1266 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1267 }
1268
1269 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1270 {
1271 git_zstream stream;
1272 int status;
1273 unsigned char outbuf[4096];
1274
1275 git_deflate_init(&stream, zlib_compression_level);
1276 stream.next_in = in;
1277 stream.avail_in = size;
1278
1279 do {
1280 stream.next_out = outbuf;
1281 stream.avail_out = sizeof(outbuf);
1282 status = git_deflate(&stream, Z_FINISH);
1283 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1284 } while (status == Z_OK);
1285
1286 if (status != Z_STREAM_END)
1287 die(_("unable to deflate appended object (%d)"), status);
1288 size = stream.total_out;
1289 git_deflate_end(&stream);
1290 return size;
1291 }
1292
1293 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1294 const unsigned char *sha1, void *buf,
1295 unsigned long size, enum object_type type)
1296 {
1297 struct object_entry *obj = &objects[nr_objects++];
1298 unsigned char header[10];
1299 unsigned long s = size;
1300 int n = 0;
1301 unsigned char c = (type << 4) | (s & 15);
1302 s >>= 4;
1303 while (s) {
1304 header[n++] = c | 0x80;
1305 c = s & 0x7f;
1306 s >>= 7;
1307 }
1308 header[n++] = c;
1309 crc32_begin(f);
1310 sha1write(f, header, n);
1311 obj[0].size = size;
1312 obj[0].hdr_size = n;
1313 obj[0].type = type;
1314 obj[0].real_type = type;
1315 obj[1].idx.offset = obj[0].idx.offset + n;
1316 obj[1].idx.offset += write_compressed(f, buf, size);
1317 obj[0].idx.crc32 = crc32_end(f);
1318 sha1flush(f);
1319 hashcpy(obj->idx.sha1, sha1);
1320 return obj;
1321 }
1322
1323 static int delta_pos_compare(const void *_a, const void *_b)
1324 {
1325 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1326 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1327 return a->obj_no - b->obj_no;
1328 }
1329
1330 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1331 {
1332 struct ref_delta_entry **sorted_by_pos;
1333 int i, n = 0;
1334
1335 /*
1336 * Since many unresolved deltas may well be themselves base objects
1337 * for more unresolved deltas, we really want to include the
1338 * smallest number of base objects that would cover as much delta
1339 * as possible by picking the
1340 * trunc deltas first, allowing for other deltas to resolve without
1341 * additional base objects. Since most base objects are to be found
1342 * before deltas depending on them, a good heuristic is to start
1343 * resolving deltas in the same order as their position in the pack.
1344 */
1345 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1346 for (i = 0; i < nr_ref_deltas; i++)
1347 sorted_by_pos[n++] = &ref_deltas[i];
1348 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1349
1350 for (i = 0; i < n; i++) {
1351 struct ref_delta_entry *d = sorted_by_pos[i];
1352 enum object_type type;
1353 struct base_data *base_obj = alloc_base_data();
1354
1355 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1356 continue;
1357 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1358 if (!base_obj->data)
1359 continue;
1360
1361 if (check_sha1_signature(d->sha1, base_obj->data,
1362 base_obj->size, typename(type)))
1363 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1364 base_obj->obj = append_obj_to_pack(f, d->sha1,
1365 base_obj->data, base_obj->size, type);
1366 find_unresolved_deltas(base_obj);
1367 display_progress(progress, nr_resolved_deltas);
1368 }
1369 free(sorted_by_pos);
1370 }
1371
1372 static void final(const char *final_pack_name, const char *curr_pack_name,
1373 const char *final_index_name, const char *curr_index_name,
1374 const char *keep_name, const char *keep_msg,
1375 unsigned char *sha1)
1376 {
1377 const char *report = "pack";
1378 char name[PATH_MAX];
1379 int err;
1380
1381 if (!from_stdin) {
1382 close(input_fd);
1383 } else {
1384 fsync_or_die(output_fd, curr_pack_name);
1385 err = close(output_fd);
1386 if (err)
1387 die_errno(_("error while closing pack file"));
1388 }
1389
1390 if (keep_msg) {
1391 int keep_fd, keep_msg_len = strlen(keep_msg);
1392
1393 if (!keep_name)
1394 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1395 else
1396 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1397
1398 if (keep_fd < 0) {
1399 if (errno != EEXIST)
1400 die_errno(_("cannot write keep file '%s'"),
1401 keep_name ? keep_name : name);
1402 } else {
1403 if (keep_msg_len > 0) {
1404 write_or_die(keep_fd, keep_msg, keep_msg_len);
1405 write_or_die(keep_fd, "\n", 1);
1406 }
1407 if (close(keep_fd) != 0)
1408 die_errno(_("cannot close written keep file '%s'"),
1409 keep_name ? keep_name : name);
1410 report = "keep";
1411 }
1412 }
1413
1414 if (final_pack_name != curr_pack_name) {
1415 if (!final_pack_name) {
1416 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1417 get_object_directory(), sha1_to_hex(sha1));
1418 final_pack_name = name;
1419 }
1420 if (move_temp_to_file(curr_pack_name, final_pack_name))
1421 die(_("cannot store pack file"));
1422 } else if (from_stdin)
1423 chmod(final_pack_name, 0444);
1424
1425 if (final_index_name != curr_index_name) {
1426 if (!final_index_name) {
1427 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1428 get_object_directory(), sha1_to_hex(sha1));
1429 final_index_name = name;
1430 }
1431 if (move_temp_to_file(curr_index_name, final_index_name))
1432 die(_("cannot store index file"));
1433 } else
1434 chmod(final_index_name, 0444);
1435
1436 if (!from_stdin) {
1437 printf("%s\n", sha1_to_hex(sha1));
1438 } else {
1439 char buf[48];
1440 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1441 report, sha1_to_hex(sha1));
1442 write_or_die(1, buf, len);
1443
1444 /*
1445 * Let's just mimic git-unpack-objects here and write
1446 * the last part of the input buffer to stdout.
1447 */
1448 while (input_len) {
1449 err = xwrite(1, input_buffer + input_offset, input_len);
1450 if (err <= 0)
1451 break;
1452 input_len -= err;
1453 input_offset += err;
1454 }
1455 }
1456 }
1457
1458 static int git_index_pack_config(const char *k, const char *v, void *cb)
1459 {
1460 struct pack_idx_option *opts = cb;
1461
1462 if (!strcmp(k, "pack.indexversion")) {
1463 opts->version = git_config_int(k, v);
1464 if (opts->version > 2)
1465 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1466 return 0;
1467 }
1468 if (!strcmp(k, "pack.threads")) {
1469 nr_threads = git_config_int(k, v);
1470 if (nr_threads < 0)
1471 die(_("invalid number of threads specified (%d)"),
1472 nr_threads);
1473 #ifdef NO_PTHREADS
1474 if (nr_threads != 1)
1475 warning(_("no threads support, ignoring %s"), k);
1476 nr_threads = 1;
1477 #endif
1478 return 0;
1479 }
1480 return git_default_config(k, v, cb);
1481 }
1482
1483 static int cmp_uint32(const void *a_, const void *b_)
1484 {
1485 uint32_t a = *((uint32_t *)a_);
1486 uint32_t b = *((uint32_t *)b_);
1487
1488 return (a < b) ? -1 : (a != b);
1489 }
1490
1491 static void read_v2_anomalous_offsets(struct packed_git *p,
1492 struct pack_idx_option *opts)
1493 {
1494 const uint32_t *idx1, *idx2;
1495 uint32_t i;
1496
1497 /* The address of the 4-byte offset table */
1498 idx1 = (((const uint32_t *)p->index_data)
1499 + 2 /* 8-byte header */
1500 + 256 /* fan out */
1501 + 5 * p->num_objects /* 20-byte SHA-1 table */
1502 + p->num_objects /* CRC32 table */
1503 );
1504
1505 /* The address of the 8-byte offset table */
1506 idx2 = idx1 + p->num_objects;
1507
1508 for (i = 0; i < p->num_objects; i++) {
1509 uint32_t off = ntohl(idx1[i]);
1510 if (!(off & 0x80000000))
1511 continue;
1512 off = off & 0x7fffffff;
1513 if (idx2[off * 2])
1514 continue;
1515 /*
1516 * The real offset is ntohl(idx2[off * 2]) in high 4
1517 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1518 * octets. But idx2[off * 2] is Zero!!!
1519 */
1520 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1521 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1522 }
1523
1524 if (1 < opts->anomaly_nr)
1525 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1526 }
1527
1528 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1529 {
1530 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1531
1532 if (!p)
1533 die(_("Cannot open existing pack file '%s'"), pack_name);
1534 if (open_pack_index(p))
1535 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1536
1537 /* Read the attributes from the existing idx file */
1538 opts->version = p->index_version;
1539
1540 if (opts->version == 2)
1541 read_v2_anomalous_offsets(p, opts);
1542
1543 /*
1544 * Get rid of the idx file as we do not need it anymore.
1545 * NEEDSWORK: extract this bit from free_pack_by_name() in
1546 * sha1_file.c, perhaps? It shouldn't matter very much as we
1547 * know we haven't installed this pack (hence we never have
1548 * read anything from it).
1549 */
1550 close_pack_index(p);
1551 free(p);
1552 }
1553
1554 static void show_pack_info(int stat_only)
1555 {
1556 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1557 unsigned long *chain_histogram = NULL;
1558
1559 if (deepest_delta)
1560 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1561
1562 for (i = 0; i < nr_objects; i++) {
1563 struct object_entry *obj = &objects[i];
1564
1565 if (is_delta_type(obj->type))
1566 chain_histogram[obj_stat[i].delta_depth - 1]++;
1567 if (stat_only)
1568 continue;
1569 printf("%s %-6s %lu %lu %"PRIuMAX,
1570 sha1_to_hex(obj->idx.sha1),
1571 typename(obj->real_type), obj->size,
1572 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1573 (uintmax_t)obj->idx.offset);
1574 if (is_delta_type(obj->type)) {
1575 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1576 printf(" %u %s", obj_stat[i].delta_depth, sha1_to_hex(bobj->idx.sha1));
1577 }
1578 putchar('\n');
1579 }
1580
1581 if (baseobjects)
1582 printf_ln(Q_("non delta: %d object",
1583 "non delta: %d objects",
1584 baseobjects),
1585 baseobjects);
1586 for (i = 0; i < deepest_delta; i++) {
1587 if (!chain_histogram[i])
1588 continue;
1589 printf_ln(Q_("chain length = %d: %lu object",
1590 "chain length = %d: %lu objects",
1591 chain_histogram[i]),
1592 i + 1,
1593 chain_histogram[i]);
1594 }
1595 }
1596
1597 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1598 {
1599 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1600 const char *curr_index;
1601 const char *index_name = NULL, *pack_name = NULL;
1602 const char *keep_name = NULL, *keep_msg = NULL;
1603 struct strbuf index_name_buf = STRBUF_INIT,
1604 keep_name_buf = STRBUF_INIT;
1605 struct pack_idx_entry **idx_objects;
1606 struct pack_idx_option opts;
1607 unsigned char pack_sha1[20];
1608 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1609
1610 if (argc == 2 && !strcmp(argv[1], "-h"))
1611 usage(index_pack_usage);
1612
1613 check_replace_refs = 0;
1614
1615 reset_pack_idx_option(&opts);
1616 git_config(git_index_pack_config, &opts);
1617 if (prefix && chdir(prefix))
1618 die(_("Cannot come back to cwd"));
1619
1620 for (i = 1; i < argc; i++) {
1621 const char *arg = argv[i];
1622
1623 if (*arg == '-') {
1624 if (!strcmp(arg, "--stdin")) {
1625 from_stdin = 1;
1626 } else if (!strcmp(arg, "--fix-thin")) {
1627 fix_thin_pack = 1;
1628 } else if (!strcmp(arg, "--strict")) {
1629 strict = 1;
1630 do_fsck_object = 1;
1631 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1632 strict = 1;
1633 check_self_contained_and_connected = 1;
1634 } else if (!strcmp(arg, "--verify")) {
1635 verify = 1;
1636 } else if (!strcmp(arg, "--verify-stat")) {
1637 verify = 1;
1638 show_stat = 1;
1639 } else if (!strcmp(arg, "--verify-stat-only")) {
1640 verify = 1;
1641 show_stat = 1;
1642 stat_only = 1;
1643 } else if (!strcmp(arg, "--keep")) {
1644 keep_msg = "";
1645 } else if (starts_with(arg, "--keep=")) {
1646 keep_msg = arg + 7;
1647 } else if (starts_with(arg, "--threads=")) {
1648 char *end;
1649 nr_threads = strtoul(arg+10, &end, 0);
1650 if (!arg[10] || *end || nr_threads < 0)
1651 usage(index_pack_usage);
1652 #ifdef NO_PTHREADS
1653 if (nr_threads != 1)
1654 warning(_("no threads support, "
1655 "ignoring %s"), arg);
1656 nr_threads = 1;
1657 #endif
1658 } else if (starts_with(arg, "--pack_header=")) {
1659 struct pack_header *hdr;
1660 char *c;
1661
1662 hdr = (struct pack_header *)input_buffer;
1663 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1664 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1665 if (*c != ',')
1666 die(_("bad %s"), arg);
1667 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1668 if (*c)
1669 die(_("bad %s"), arg);
1670 input_len = sizeof(*hdr);
1671 } else if (!strcmp(arg, "-v")) {
1672 verbose = 1;
1673 } else if (!strcmp(arg, "-o")) {
1674 if (index_name || (i+1) >= argc)
1675 usage(index_pack_usage);
1676 index_name = argv[++i];
1677 } else if (starts_with(arg, "--index-version=")) {
1678 char *c;
1679 opts.version = strtoul(arg + 16, &c, 10);
1680 if (opts.version > 2)
1681 die(_("bad %s"), arg);
1682 if (*c == ',')
1683 opts.off32_limit = strtoul(c+1, &c, 0);
1684 if (*c || opts.off32_limit & 0x80000000)
1685 die(_("bad %s"), arg);
1686 } else
1687 usage(index_pack_usage);
1688 continue;
1689 }
1690
1691 if (pack_name)
1692 usage(index_pack_usage);
1693 pack_name = arg;
1694 }
1695
1696 if (!pack_name && !from_stdin)
1697 usage(index_pack_usage);
1698 if (fix_thin_pack && !from_stdin)
1699 die(_("--fix-thin cannot be used without --stdin"));
1700 if (!index_name && pack_name) {
1701 size_t len;
1702 if (!strip_suffix(pack_name, ".pack", &len))
1703 die(_("packfile name '%s' does not end with '.pack'"),
1704 pack_name);
1705 strbuf_add(&index_name_buf, pack_name, len);
1706 strbuf_addstr(&index_name_buf, ".idx");
1707 index_name = index_name_buf.buf;
1708 }
1709 if (keep_msg && !keep_name && pack_name) {
1710 size_t len;
1711 if (!strip_suffix(pack_name, ".pack", &len))
1712 die(_("packfile name '%s' does not end with '.pack'"),
1713 pack_name);
1714 strbuf_add(&keep_name_buf, pack_name, len);
1715 strbuf_addstr(&keep_name_buf, ".idx");
1716 keep_name = keep_name_buf.buf;
1717 }
1718 if (verify) {
1719 if (!index_name)
1720 die(_("--verify with no packfile name given"));
1721 read_idx_option(&opts, index_name);
1722 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1723 }
1724 if (strict)
1725 opts.flags |= WRITE_IDX_STRICT;
1726
1727 #ifndef NO_PTHREADS
1728 if (!nr_threads) {
1729 nr_threads = online_cpus();
1730 /* An experiment showed that more threads does not mean faster */
1731 if (nr_threads > 3)
1732 nr_threads = 3;
1733 }
1734 #endif
1735
1736 curr_pack = open_pack_file(pack_name);
1737 parse_pack_header();
1738 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1739 if (show_stat)
1740 obj_stat = xcalloc(nr_objects + 1, sizeof(struct object_stat));
1741 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1742 parse_pack_objects(pack_sha1);
1743 resolve_deltas();
1744 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1745 free(ofs_deltas);
1746 free(ref_deltas);
1747 if (strict)
1748 foreign_nr = check_objects();
1749
1750 if (show_stat)
1751 show_pack_info(stat_only);
1752
1753 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1754 for (i = 0; i < nr_objects; i++)
1755 idx_objects[i] = &objects[i].idx;
1756 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1757 free(idx_objects);
1758
1759 if (!verify)
1760 final(pack_name, curr_pack,
1761 index_name, curr_index,
1762 keep_name, keep_msg,
1763 pack_sha1);
1764 else
1765 close(input_fd);
1766 free(objects);
1767 strbuf_release(&index_name_buf);
1768 strbuf_release(&keep_name_buf);
1769 if (pack_name == NULL)
1770 free((void *) curr_pack);
1771 if (index_name == NULL)
1772 free((void *) curr_index);
1773
1774 /*
1775 * Let the caller know this pack is not self contained
1776 */
1777 if (check_self_contained_and_connected && foreign_nr)
1778 return 1;
1779
1780 return 0;
1781 }
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