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sha1_name: make wraparound of the index into ring-buffer explicit
[git.git] / builtin / index-pack.c
blob0a27bab11b6b5a1b162c4dfef34c645c7d5f14ad
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 struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
79 static int verbose;
80 static int show_resolving_progress;
81 static int show_stat;
82 static int check_self_contained_and_connected;
83
84 static struct progress *progress;
85
86 /* We always read in 4kB chunks. */
87 static unsigned char input_buffer[4096];
88 static unsigned int input_offset, input_len;
89 static off_t consumed_bytes;
90 static off_t max_input_size;
91 static unsigned deepest_delta;
92 static git_SHA_CTX input_ctx;
93 static uint32_t input_crc32;
94 static int input_fd, output_fd;
95 static const char *curr_pack;
96
97 #ifndef NO_PTHREADS
98
99 static struct thread_local *thread_data;
100 static int nr_dispatched;
101 static int threads_active;
102
103 static pthread_mutex_t read_mutex;
104 #define read_lock() lock_mutex(&read_mutex)
105 #define read_unlock() unlock_mutex(&read_mutex)
106
107 static pthread_mutex_t counter_mutex;
108 #define counter_lock() lock_mutex(&counter_mutex)
109 #define counter_unlock() unlock_mutex(&counter_mutex)
110
111 static pthread_mutex_t work_mutex;
112 #define work_lock() lock_mutex(&work_mutex)
113 #define work_unlock() unlock_mutex(&work_mutex)
114
115 static pthread_mutex_t deepest_delta_mutex;
116 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
117 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
118
119 static pthread_mutex_t type_cas_mutex;
120 #define type_cas_lock() lock_mutex(&type_cas_mutex)
121 #define type_cas_unlock() unlock_mutex(&type_cas_mutex)
122
123 static pthread_key_t key;
124
125 static inline void lock_mutex(pthread_mutex_t *mutex)
126 {
127 if (threads_active)
128 pthread_mutex_lock(mutex);
129 }
130
131 static inline void unlock_mutex(pthread_mutex_t *mutex)
132 {
133 if (threads_active)
134 pthread_mutex_unlock(mutex);
135 }
136
137 /*
138 * Mutex and conditional variable can't be statically-initialized on Windows.
139 */
140 static void init_thread(void)
141 {
142 int i;
143 init_recursive_mutex(&read_mutex);
144 pthread_mutex_init(&counter_mutex, NULL);
145 pthread_mutex_init(&work_mutex, NULL);
146 pthread_mutex_init(&type_cas_mutex, NULL);
147 if (show_stat)
148 pthread_mutex_init(&deepest_delta_mutex, NULL);
149 pthread_key_create(&key, NULL);
150 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
151 for (i = 0; i < nr_threads; i++) {
152 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
153 if (thread_data[i].pack_fd == -1)
154 die_errno(_("unable to open %s"), curr_pack);
155 }
156
157 threads_active = 1;
158 }
159
160 static void cleanup_thread(void)
161 {
162 int i;
163 if (!threads_active)
164 return;
165 threads_active = 0;
166 pthread_mutex_destroy(&read_mutex);
167 pthread_mutex_destroy(&counter_mutex);
168 pthread_mutex_destroy(&work_mutex);
169 pthread_mutex_destroy(&type_cas_mutex);
170 if (show_stat)
171 pthread_mutex_destroy(&deepest_delta_mutex);
172 for (i = 0; i < nr_threads; i++)
173 close(thread_data[i].pack_fd);
174 pthread_key_delete(key);
175 free(thread_data);
176 }
177
178 #else
179
180 #define read_lock()
181 #define read_unlock()
182
183 #define counter_lock()
184 #define counter_unlock()
185
186 #define work_lock()
187 #define work_unlock()
188
189 #define deepest_delta_lock()
190 #define deepest_delta_unlock()
191
192 #define type_cas_lock()
193 #define type_cas_unlock()
194
195 #endif
196
197
198 static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
199 {
200 if (!obj)
201 return -1;
202
203 if (type != OBJ_ANY && obj->type != type)
204 die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
205
206 obj->flags |= FLAG_LINK;
207 return 0;
208 }
209
210 /* The content of each linked object must have been checked
211 or it must be already present in the object database */
212 static unsigned check_object(struct object *obj)
213 {
214 if (!obj)
215 return 0;
216
217 if (!(obj->flags & FLAG_LINK))
218 return 0;
219
220 if (!(obj->flags & FLAG_CHECKED)) {
221 unsigned long size;
222 int type = sha1_object_info(obj->oid.hash, &size);
223 if (type <= 0)
224 die(_("did not receive expected object %s"),
225 oid_to_hex(&obj->oid));
226 if (type != obj->type)
227 die(_("object %s: expected type %s, found %s"),
228 oid_to_hex(&obj->oid),
229 typename(obj->type), typename(type));
230 obj->flags |= FLAG_CHECKED;
231 return 1;
232 }
233
234 return 0;
235 }
236
237 static unsigned check_objects(void)
238 {
239 unsigned i, max, foreign_nr = 0;
240
241 max = get_max_object_index();
242 for (i = 0; i < max; i++)
243 foreign_nr += check_object(get_indexed_object(i));
244 return foreign_nr;
245 }
246
247
248 /* Discard current buffer used content. */
249 static void flush(void)
250 {
251 if (input_offset) {
252 if (output_fd >= 0)
253 write_or_die(output_fd, input_buffer, input_offset);
254 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
255 memmove(input_buffer, input_buffer + input_offset, input_len);
256 input_offset = 0;
257 }
258 }
259
260 /*
261 * Make sure at least "min" bytes are available in the buffer, and
262 * return the pointer to the buffer.
263 */
264 static void *fill(int min)
265 {
266 if (min <= input_len)
267 return input_buffer + input_offset;
268 if (min > sizeof(input_buffer))
269 die(Q_("cannot fill %d byte",
270 "cannot fill %d bytes",
271 min),
272 min);
273 flush();
274 do {
275 ssize_t ret = xread(input_fd, input_buffer + input_len,
276 sizeof(input_buffer) - input_len);
277 if (ret <= 0) {
278 if (!ret)
279 die(_("early EOF"));
280 die_errno(_("read error on input"));
281 }
282 input_len += ret;
283 if (from_stdin)
284 display_throughput(progress, consumed_bytes + input_len);
285 } while (input_len < min);
286 return input_buffer;
287 }
288
289 static void use(int bytes)
290 {
291 if (bytes > input_len)
292 die(_("used more bytes than were available"));
293 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
294 input_len -= bytes;
295 input_offset += bytes;
296
297 /* make sure off_t is sufficiently large not to wrap */
298 if (signed_add_overflows(consumed_bytes, bytes))
299 die(_("pack too large for current definition of off_t"));
300 consumed_bytes += bytes;
301 if (max_input_size && consumed_bytes > max_input_size)
302 die(_("pack exceeds maximum allowed size"));
303 }
304
305 static const char *open_pack_file(const char *pack_name)
306 {
307 if (from_stdin) {
308 input_fd = 0;
309 if (!pack_name) {
310 static char tmp_file[PATH_MAX];
311 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
312 "pack/tmp_pack_XXXXXX");
313 pack_name = xstrdup(tmp_file);
314 } else
315 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
316 if (output_fd < 0)
317 die_errno(_("unable to create '%s'"), pack_name);
318 nothread_data.pack_fd = output_fd;
319 } else {
320 input_fd = open(pack_name, O_RDONLY);
321 if (input_fd < 0)
322 die_errno(_("cannot open packfile '%s'"), pack_name);
323 output_fd = -1;
324 nothread_data.pack_fd = input_fd;
325 }
326 git_SHA1_Init(&input_ctx);
327 return pack_name;
328 }
329
330 static void parse_pack_header(void)
331 {
332 struct pack_header *hdr = fill(sizeof(struct pack_header));
333
334 /* Header consistency check */
335 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
336 die(_("pack signature mismatch"));
337 if (!pack_version_ok(hdr->hdr_version))
338 die(_("pack version %"PRIu32" unsupported"),
339 ntohl(hdr->hdr_version));
340
341 nr_objects = ntohl(hdr->hdr_entries);
342 use(sizeof(struct pack_header));
343 }
344
345 static NORETURN void bad_object(off_t offset, const char *format,
346 ...) __attribute__((format (printf, 2, 3)));
347
348 static NORETURN void bad_object(off_t offset, const char *format, ...)
349 {
350 va_list params;
351 char buf[1024];
352
353 va_start(params, format);
354 vsnprintf(buf, sizeof(buf), format, params);
355 va_end(params);
356 die(_("pack has bad object at offset %"PRIuMAX": %s"),
357 (uintmax_t)offset, buf);
358 }
359
360 static inline struct thread_local *get_thread_data(void)
361 {
362 #ifndef NO_PTHREADS
363 if (threads_active)
364 return pthread_getspecific(key);
365 assert(!threads_active &&
366 "This should only be reached when all threads are gone");
367 #endif
368 return &nothread_data;
369 }
370
371 #ifndef NO_PTHREADS
372 static void set_thread_data(struct thread_local *data)
373 {
374 if (threads_active)
375 pthread_setspecific(key, data);
376 }
377 #endif
378
379 static struct base_data *alloc_base_data(void)
380 {
381 struct base_data *base = xcalloc(1, sizeof(struct base_data));
382 base->ref_last = -1;
383 base->ofs_last = -1;
384 return base;
385 }
386
387 static void free_base_data(struct base_data *c)
388 {
389 if (c->data) {
390 free(c->data);
391 c->data = NULL;
392 get_thread_data()->base_cache_used -= c->size;
393 }
394 }
395
396 static void prune_base_data(struct base_data *retain)
397 {
398 struct base_data *b;
399 struct thread_local *data = get_thread_data();
400 for (b = data->base_cache;
401 data->base_cache_used > delta_base_cache_limit && b;
402 b = b->child) {
403 if (b->data && b != retain)
404 free_base_data(b);
405 }
406 }
407
408 static void link_base_data(struct base_data *base, struct base_data *c)
409 {
410 if (base)
411 base->child = c;
412 else
413 get_thread_data()->base_cache = c;
414
415 c->base = base;
416 c->child = NULL;
417 if (c->data)
418 get_thread_data()->base_cache_used += c->size;
419 prune_base_data(c);
420 }
421
422 static void unlink_base_data(struct base_data *c)
423 {
424 struct base_data *base = c->base;
425 if (base)
426 base->child = NULL;
427 else
428 get_thread_data()->base_cache = NULL;
429 free_base_data(c);
430 }
431
432 static int is_delta_type(enum object_type type)
433 {
434 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
435 }
436
437 static void *unpack_entry_data(off_t offset, unsigned long size,
438 enum object_type type, unsigned char *sha1)
439 {
440 static char fixed_buf[8192];
441 int status;
442 git_zstream stream;
443 void *buf;
444 git_SHA_CTX c;
445 char hdr[32];
446 int hdrlen;
447
448 if (!is_delta_type(type)) {
449 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), size) + 1;
450 git_SHA1_Init(&c);
451 git_SHA1_Update(&c, hdr, hdrlen);
452 } else
453 sha1 = NULL;
454 if (type == OBJ_BLOB && size > big_file_threshold)
455 buf = fixed_buf;
456 else
457 buf = xmallocz(size);
458
459 memset(&stream, 0, sizeof(stream));
460 git_inflate_init(&stream);
461 stream.next_out = buf;
462 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
463
464 do {
465 unsigned char *last_out = stream.next_out;
466 stream.next_in = fill(1);
467 stream.avail_in = input_len;
468 status = git_inflate(&stream, 0);
469 use(input_len - stream.avail_in);
470 if (sha1)
471 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
472 if (buf == fixed_buf) {
473 stream.next_out = buf;
474 stream.avail_out = sizeof(fixed_buf);
475 }
476 } while (status == Z_OK);
477 if (stream.total_out != size || status != Z_STREAM_END)
478 bad_object(offset, _("inflate returned %d"), status);
479 git_inflate_end(&stream);
480 if (sha1)
481 git_SHA1_Final(sha1, &c);
482 return buf == fixed_buf ? NULL : buf;
483 }
484
485 static void *unpack_raw_entry(struct object_entry *obj,
486 off_t *ofs_offset,
487 unsigned char *ref_sha1,
488 unsigned char *sha1)
489 {
490 unsigned char *p;
491 unsigned long size, c;
492 off_t base_offset;
493 unsigned shift;
494 void *data;
495
496 obj->idx.offset = consumed_bytes;
497 input_crc32 = crc32(0, NULL, 0);
498
499 p = fill(1);
500 c = *p;
501 use(1);
502 obj->type = (c >> 4) & 7;
503 size = (c & 15);
504 shift = 4;
505 while (c & 0x80) {
506 p = fill(1);
507 c = *p;
508 use(1);
509 size += (c & 0x7f) << shift;
510 shift += 7;
511 }
512 obj->size = size;
513
514 switch (obj->type) {
515 case OBJ_REF_DELTA:
516 hashcpy(ref_sha1, fill(20));
517 use(20);
518 break;
519 case OBJ_OFS_DELTA:
520 p = fill(1);
521 c = *p;
522 use(1);
523 base_offset = c & 127;
524 while (c & 128) {
525 base_offset += 1;
526 if (!base_offset || MSB(base_offset, 7))
527 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
528 p = fill(1);
529 c = *p;
530 use(1);
531 base_offset = (base_offset << 7) + (c & 127);
532 }
533 *ofs_offset = obj->idx.offset - base_offset;
534 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
535 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
536 break;
537 case OBJ_COMMIT:
538 case OBJ_TREE:
539 case OBJ_BLOB:
540 case OBJ_TAG:
541 break;
542 default:
543 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
544 }
545 obj->hdr_size = consumed_bytes - obj->idx.offset;
546
547 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
548 obj->idx.crc32 = input_crc32;
549 return data;
550 }
551
552 static void *unpack_data(struct object_entry *obj,
553 int (*consume)(const unsigned char *, unsigned long, void *),
554 void *cb_data)
555 {
556 off_t from = obj[0].idx.offset + obj[0].hdr_size;
557 off_t len = obj[1].idx.offset - from;
558 unsigned char *data, *inbuf;
559 git_zstream stream;
560 int status;
561
562 data = xmallocz(consume ? 64*1024 : obj->size);
563 inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
564
565 memset(&stream, 0, sizeof(stream));
566 git_inflate_init(&stream);
567 stream.next_out = data;
568 stream.avail_out = consume ? 64*1024 : obj->size;
569
570 do {
571 ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
572 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
573 if (n < 0)
574 die_errno(_("cannot pread pack file"));
575 if (!n)
576 die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
577 "premature end of pack file, %"PRIuMAX" bytes missing",
578 (unsigned int)len),
579 (uintmax_t)len);
580 from += n;
581 len -= n;
582 stream.next_in = inbuf;
583 stream.avail_in = n;
584 if (!consume)
585 status = git_inflate(&stream, 0);
586 else {
587 do {
588 status = git_inflate(&stream, 0);
589 if (consume(data, stream.next_out - data, cb_data)) {
590 free(inbuf);
591 free(data);
592 return NULL;
593 }
594 stream.next_out = data;
595 stream.avail_out = 64*1024;
596 } while (status == Z_OK && stream.avail_in);
597 }
598 } while (len && status == Z_OK && !stream.avail_in);
599
600 /* This has been inflated OK when first encountered, so... */
601 if (status != Z_STREAM_END || stream.total_out != obj->size)
602 die(_("serious inflate inconsistency"));
603
604 git_inflate_end(&stream);
605 free(inbuf);
606 if (consume) {
607 free(data);
608 data = NULL;
609 }
610 return data;
611 }
612
613 static void *get_data_from_pack(struct object_entry *obj)
614 {
615 return unpack_data(obj, NULL, NULL);
616 }
617
618 static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
619 enum object_type type1,
620 enum object_type type2)
621 {
622 int cmp = type1 - type2;
623 if (cmp)
624 return cmp;
625 return offset1 < offset2 ? -1 :
626 offset1 > offset2 ? 1 :
627 0;
628 }
629
630 static int find_ofs_delta(const off_t offset, enum object_type type)
631 {
632 int first = 0, last = nr_ofs_deltas;
633
634 while (first < last) {
635 int next = (first + last) / 2;
636 struct ofs_delta_entry *delta = &ofs_deltas[next];
637 int cmp;
638
639 cmp = compare_ofs_delta_bases(offset, delta->offset,
640 type, objects[delta->obj_no].type);
641 if (!cmp)
642 return next;
643 if (cmp < 0) {
644 last = next;
645 continue;
646 }
647 first = next+1;
648 }
649 return -first-1;
650 }
651
652 static void find_ofs_delta_children(off_t offset,
653 int *first_index, int *last_index,
654 enum object_type type)
655 {
656 int first = find_ofs_delta(offset, type);
657 int last = first;
658 int end = nr_ofs_deltas - 1;
659
660 if (first < 0) {
661 *first_index = 0;
662 *last_index = -1;
663 return;
664 }
665 while (first > 0 && ofs_deltas[first - 1].offset == offset)
666 --first;
667 while (last < end && ofs_deltas[last + 1].offset == offset)
668 ++last;
669 *first_index = first;
670 *last_index = last;
671 }
672
673 static int compare_ref_delta_bases(const unsigned char *sha1,
674 const unsigned char *sha2,
675 enum object_type type1,
676 enum object_type type2)
677 {
678 int cmp = type1 - type2;
679 if (cmp)
680 return cmp;
681 return hashcmp(sha1, sha2);
682 }
683
684 static int find_ref_delta(const unsigned char *sha1, enum object_type type)
685 {
686 int first = 0, last = nr_ref_deltas;
687
688 while (first < last) {
689 int next = (first + last) / 2;
690 struct ref_delta_entry *delta = &ref_deltas[next];
691 int cmp;
692
693 cmp = compare_ref_delta_bases(sha1, delta->sha1,
694 type, objects[delta->obj_no].type);
695 if (!cmp)
696 return next;
697 if (cmp < 0) {
698 last = next;
699 continue;
700 }
701 first = next+1;
702 }
703 return -first-1;
704 }
705
706 static void find_ref_delta_children(const unsigned char *sha1,
707 int *first_index, int *last_index,
708 enum object_type type)
709 {
710 int first = find_ref_delta(sha1, type);
711 int last = first;
712 int end = nr_ref_deltas - 1;
713
714 if (first < 0) {
715 *first_index = 0;
716 *last_index = -1;
717 return;
718 }
719 while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
720 --first;
721 while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
722 ++last;
723 *first_index = first;
724 *last_index = last;
725 }
726
727 struct compare_data {
728 struct object_entry *entry;
729 struct git_istream *st;
730 unsigned char *buf;
731 unsigned long buf_size;
732 };
733
734 static int compare_objects(const unsigned char *buf, unsigned long size,
735 void *cb_data)
736 {
737 struct compare_data *data = cb_data;
738
739 if (data->buf_size < size) {
740 free(data->buf);
741 data->buf = xmalloc(size);
742 data->buf_size = size;
743 }
744
745 while (size) {
746 ssize_t len = read_istream(data->st, data->buf, size);
747 if (len == 0)
748 die(_("SHA1 COLLISION FOUND WITH %s !"),
749 sha1_to_hex(data->entry->idx.sha1));
750 if (len < 0)
751 die(_("unable to read %s"),
752 sha1_to_hex(data->entry->idx.sha1));
753 if (memcmp(buf, data->buf, len))
754 die(_("SHA1 COLLISION FOUND WITH %s !"),
755 sha1_to_hex(data->entry->idx.sha1));
756 size -= len;
757 buf += len;
758 }
759 return 0;
760 }
761
762 static int check_collison(struct object_entry *entry)
763 {
764 struct compare_data data;
765 enum object_type type;
766 unsigned long size;
767
768 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
769 return -1;
770
771 memset(&data, 0, sizeof(data));
772 data.entry = entry;
773 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
774 if (!data.st)
775 return -1;
776 if (size != entry->size || type != entry->type)
777 die(_("SHA1 COLLISION FOUND WITH %s !"),
778 sha1_to_hex(entry->idx.sha1));
779 unpack_data(entry, compare_objects, &data);
780 close_istream(data.st);
781 free(data.buf);
782 return 0;
783 }
784
785 static void sha1_object(const void *data, struct object_entry *obj_entry,
786 unsigned long size, enum object_type type,
787 const unsigned char *sha1)
788 {
789 void *new_data = NULL;
790 int collision_test_needed;
791
792 assert(data || obj_entry);
793
794 read_lock();
795 collision_test_needed = has_sha1_file_with_flags(sha1, HAS_SHA1_QUICK);
796 read_unlock();
797
798 if (collision_test_needed && !data) {
799 read_lock();
800 if (!check_collison(obj_entry))
801 collision_test_needed = 0;
802 read_unlock();
803 }
804 if (collision_test_needed) {
805 void *has_data;
806 enum object_type has_type;
807 unsigned long has_size;
808 read_lock();
809 has_type = sha1_object_info(sha1, &has_size);
810 if (has_type != type || has_size != size)
811 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
812 has_data = read_sha1_file(sha1, &has_type, &has_size);
813 read_unlock();
814 if (!data)
815 data = new_data = get_data_from_pack(obj_entry);
816 if (!has_data)
817 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
818 if (size != has_size || type != has_type ||
819 memcmp(data, has_data, size) != 0)
820 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
821 free(has_data);
822 }
823
824 if (strict) {
825 read_lock();
826 if (type == OBJ_BLOB) {
827 struct blob *blob = lookup_blob(sha1);
828 if (blob)
829 blob->object.flags |= FLAG_CHECKED;
830 else
831 die(_("invalid blob object %s"), sha1_to_hex(sha1));
832 } else {
833 struct object *obj;
834 int eaten;
835 void *buf = (void *) data;
836
837 assert(data && "data can only be NULL for large _blobs_");
838
839 /*
840 * we do not need to free the memory here, as the
841 * buf is deleted by the caller.
842 */
843 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
844 if (!obj)
845 die(_("invalid %s"), typename(type));
846 if (do_fsck_object &&
847 fsck_object(obj, buf, size, &fsck_options))
848 die(_("Error in object"));
849 if (fsck_walk(obj, NULL, &fsck_options))
850 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
851
852 if (obj->type == OBJ_TREE) {
853 struct tree *item = (struct tree *) obj;
854 item->buffer = NULL;
855 obj->parsed = 0;
856 }
857 if (obj->type == OBJ_COMMIT) {
858 struct commit *commit = (struct commit *) obj;
859 if (detach_commit_buffer(commit, NULL) != data)
860 die("BUG: parse_object_buffer transmogrified our buffer");
861 }
862 obj->flags |= FLAG_CHECKED;
863 }
864 read_unlock();
865 }
866
867 free(new_data);
868 }
869
870 /*
871 * This function is part of find_unresolved_deltas(). There are two
872 * walkers going in the opposite ways.
873 *
874 * The first one in find_unresolved_deltas() traverses down from
875 * parent node to children, deflating nodes along the way. However,
876 * memory for deflated nodes is limited by delta_base_cache_limit, so
877 * at some point parent node's deflated content may be freed.
878 *
879 * The second walker is this function, which goes from current node up
880 * to top parent if necessary to deflate the node. In normal
881 * situation, its parent node would be already deflated, so it just
882 * needs to apply delta.
883 *
884 * In the worst case scenario, parent node is no longer deflated because
885 * we're running out of delta_base_cache_limit; we need to re-deflate
886 * parents, possibly up to the top base.
887 *
888 * All deflated objects here are subject to be freed if we exceed
889 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
890 * just need to make sure the last node is not freed.
891 */
892 static void *get_base_data(struct base_data *c)
893 {
894 if (!c->data) {
895 struct object_entry *obj = c->obj;
896 struct base_data **delta = NULL;
897 int delta_nr = 0, delta_alloc = 0;
898
899 while (is_delta_type(c->obj->type) && !c->data) {
900 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
901 delta[delta_nr++] = c;
902 c = c->base;
903 }
904 if (!delta_nr) {
905 c->data = get_data_from_pack(obj);
906 c->size = obj->size;
907 get_thread_data()->base_cache_used += c->size;
908 prune_base_data(c);
909 }
910 for (; delta_nr > 0; delta_nr--) {
911 void *base, *raw;
912 c = delta[delta_nr - 1];
913 obj = c->obj;
914 base = get_base_data(c->base);
915 raw = get_data_from_pack(obj);
916 c->data = patch_delta(
917 base, c->base->size,
918 raw, obj->size,
919 &c->size);
920 free(raw);
921 if (!c->data)
922 bad_object(obj->idx.offset, _("failed to apply delta"));
923 get_thread_data()->base_cache_used += c->size;
924 prune_base_data(c);
925 }
926 free(delta);
927 }
928 return c->data;
929 }
930
931 static void resolve_delta(struct object_entry *delta_obj,
932 struct base_data *base, struct base_data *result)
933 {
934 void *base_data, *delta_data;
935
936 if (show_stat) {
937 int i = delta_obj - objects;
938 int j = base->obj - objects;
939 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
940 deepest_delta_lock();
941 if (deepest_delta < obj_stat[i].delta_depth)
942 deepest_delta = obj_stat[i].delta_depth;
943 deepest_delta_unlock();
944 obj_stat[i].base_object_no = j;
945 }
946 delta_data = get_data_from_pack(delta_obj);
947 base_data = get_base_data(base);
948 result->obj = delta_obj;
949 result->data = patch_delta(base_data, base->size,
950 delta_data, delta_obj->size, &result->size);
951 free(delta_data);
952 if (!result->data)
953 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
954 hash_sha1_file(result->data, result->size,
955 typename(delta_obj->real_type), delta_obj->idx.sha1);
956 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
957 delta_obj->idx.sha1);
958 counter_lock();
959 nr_resolved_deltas++;
960 counter_unlock();
961 }
962
963 /*
964 * Standard boolean compare-and-swap: atomically check whether "*type" is
965 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
966 * and return false.
967 */
968 static int compare_and_swap_type(signed char *type,
969 enum object_type want,
970 enum object_type set)
971 {
972 enum object_type old;
973
974 type_cas_lock();
975 old = *type;
976 if (old == want)
977 *type = set;
978 type_cas_unlock();
979
980 return old == want;
981 }
982
983 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
984 struct base_data *prev_base)
985 {
986 if (base->ref_last == -1 && base->ofs_last == -1) {
987 find_ref_delta_children(base->obj->idx.sha1,
988 &base->ref_first, &base->ref_last,
989 OBJ_REF_DELTA);
990
991 find_ofs_delta_children(base->obj->idx.offset,
992 &base->ofs_first, &base->ofs_last,
993 OBJ_OFS_DELTA);
994
995 if (base->ref_last == -1 && base->ofs_last == -1) {
996 free(base->data);
997 return NULL;
998 }
999
1000 link_base_data(prev_base, base);
1001 }
1002
1003 if (base->ref_first <= base->ref_last) {
1004 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1005 struct base_data *result = alloc_base_data();
1006
1007 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1008 base->obj->real_type))
1009 die("BUG: child->real_type != OBJ_REF_DELTA");
1010
1011 resolve_delta(child, base, result);
1012 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1013 free_base_data(base);
1014
1015 base->ref_first++;
1016 return result;
1017 }
1018
1019 if (base->ofs_first <= base->ofs_last) {
1020 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1021 struct base_data *result = alloc_base_data();
1022
1023 assert(child->real_type == OBJ_OFS_DELTA);
1024 child->real_type = base->obj->real_type;
1025 resolve_delta(child, base, result);
1026 if (base->ofs_first == base->ofs_last)
1027 free_base_data(base);
1028
1029 base->ofs_first++;
1030 return result;
1031 }
1032
1033 unlink_base_data(base);
1034 return NULL;
1035 }
1036
1037 static void find_unresolved_deltas(struct base_data *base)
1038 {
1039 struct base_data *new_base, *prev_base = NULL;
1040 for (;;) {
1041 new_base = find_unresolved_deltas_1(base, prev_base);
1042
1043 if (new_base) {
1044 prev_base = base;
1045 base = new_base;
1046 } else {
1047 free(base);
1048 base = prev_base;
1049 if (!base)
1050 return;
1051 prev_base = base->base;
1052 }
1053 }
1054 }
1055
1056 static int compare_ofs_delta_entry(const void *a, const void *b)
1057 {
1058 const struct ofs_delta_entry *delta_a = a;
1059 const struct ofs_delta_entry *delta_b = b;
1060
1061 return delta_a->offset < delta_b->offset ? -1 :
1062 delta_a->offset > delta_b->offset ? 1 :
1063 0;
1064 }
1065
1066 static int compare_ref_delta_entry(const void *a, const void *b)
1067 {
1068 const struct ref_delta_entry *delta_a = a;
1069 const struct ref_delta_entry *delta_b = b;
1070
1071 return hashcmp(delta_a->sha1, delta_b->sha1);
1072 }
1073
1074 static void resolve_base(struct object_entry *obj)
1075 {
1076 struct base_data *base_obj = alloc_base_data();
1077 base_obj->obj = obj;
1078 base_obj->data = NULL;
1079 find_unresolved_deltas(base_obj);
1080 }
1081
1082 #ifndef NO_PTHREADS
1083 static void *threaded_second_pass(void *data)
1084 {
1085 set_thread_data(data);
1086 for (;;) {
1087 int i;
1088 counter_lock();
1089 display_progress(progress, nr_resolved_deltas);
1090 counter_unlock();
1091 work_lock();
1092 while (nr_dispatched < nr_objects &&
1093 is_delta_type(objects[nr_dispatched].type))
1094 nr_dispatched++;
1095 if (nr_dispatched >= nr_objects) {
1096 work_unlock();
1097 break;
1098 }
1099 i = nr_dispatched++;
1100 work_unlock();
1101
1102 resolve_base(&objects[i]);
1103 }
1104 return NULL;
1105 }
1106 #endif
1107
1108 /*
1109 * First pass:
1110 * - find locations of all objects;
1111 * - calculate SHA1 of all non-delta objects;
1112 * - remember base (SHA1 or offset) for all deltas.
1113 */
1114 static void parse_pack_objects(unsigned char *sha1)
1115 {
1116 int i, nr_delays = 0;
1117 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1118 unsigned char ref_delta_sha1[20];
1119 struct stat st;
1120
1121 if (verbose)
1122 progress = start_progress(
1123 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1124 nr_objects);
1125 for (i = 0; i < nr_objects; i++) {
1126 struct object_entry *obj = &objects[i];
1127 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1128 ref_delta_sha1, obj->idx.sha1);
1129 obj->real_type = obj->type;
1130 if (obj->type == OBJ_OFS_DELTA) {
1131 nr_ofs_deltas++;
1132 ofs_delta->obj_no = i;
1133 ofs_delta++;
1134 } else if (obj->type == OBJ_REF_DELTA) {
1135 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1136 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_sha1);
1137 ref_deltas[nr_ref_deltas].obj_no = i;
1138 nr_ref_deltas++;
1139 } else if (!data) {
1140 /* large blobs, check later */
1141 obj->real_type = OBJ_BAD;
1142 nr_delays++;
1143 } else
1144 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1145 free(data);
1146 display_progress(progress, i+1);
1147 }
1148 objects[i].idx.offset = consumed_bytes;
1149 stop_progress(&progress);
1150
1151 /* Check pack integrity */
1152 flush();
1153 git_SHA1_Final(sha1, &input_ctx);
1154 if (hashcmp(fill(20), sha1))
1155 die(_("pack is corrupted (SHA1 mismatch)"));
1156 use(20);
1157
1158 /* If input_fd is a file, we should have reached its end now. */
1159 if (fstat(input_fd, &st))
1160 die_errno(_("cannot fstat packfile"));
1161 if (S_ISREG(st.st_mode) &&
1162 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1163 die(_("pack has junk at the end"));
1164
1165 for (i = 0; i < nr_objects; i++) {
1166 struct object_entry *obj = &objects[i];
1167 if (obj->real_type != OBJ_BAD)
1168 continue;
1169 obj->real_type = obj->type;
1170 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1171 nr_delays--;
1172 }
1173 if (nr_delays)
1174 die(_("confusion beyond insanity in parse_pack_objects()"));
1175 }
1176
1177 /*
1178 * Second pass:
1179 * - for all non-delta objects, look if it is used as a base for
1180 * deltas;
1181 * - if used as a base, uncompress the object and apply all deltas,
1182 * recursively checking if the resulting object is used as a base
1183 * for some more deltas.
1184 */
1185 static void resolve_deltas(void)
1186 {
1187 int i;
1188
1189 if (!nr_ofs_deltas && !nr_ref_deltas)
1190 return;
1191
1192 /* Sort deltas by base SHA1/offset for fast searching */
1193 QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
1194 QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
1195
1196 if (verbose || show_resolving_progress)
1197 progress = start_progress(_("Resolving deltas"),
1198 nr_ref_deltas + nr_ofs_deltas);
1199
1200 #ifndef NO_PTHREADS
1201 nr_dispatched = 0;
1202 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1203 init_thread();
1204 for (i = 0; i < nr_threads; i++) {
1205 int ret = pthread_create(&thread_data[i].thread, NULL,
1206 threaded_second_pass, thread_data + i);
1207 if (ret)
1208 die(_("unable to create thread: %s"),
1209 strerror(ret));
1210 }
1211 for (i = 0; i < nr_threads; i++)
1212 pthread_join(thread_data[i].thread, NULL);
1213 cleanup_thread();
1214 return;
1215 }
1216 #endif
1217
1218 for (i = 0; i < nr_objects; i++) {
1219 struct object_entry *obj = &objects[i];
1220
1221 if (is_delta_type(obj->type))
1222 continue;
1223 resolve_base(obj);
1224 display_progress(progress, nr_resolved_deltas);
1225 }
1226 }
1227
1228 /*
1229 * Third pass:
1230 * - append objects to convert thin pack to full pack if required
1231 * - write the final 20-byte SHA-1
1232 */
1233 static void fix_unresolved_deltas(struct sha1file *f);
1234 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1235 {
1236 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1237 stop_progress(&progress);
1238 /* Flush remaining pack final 20-byte SHA1. */
1239 flush();
1240 return;
1241 }
1242
1243 if (fix_thin_pack) {
1244 struct sha1file *f;
1245 unsigned char read_sha1[20], tail_sha1[20];
1246 struct strbuf msg = STRBUF_INIT;
1247 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1248 int nr_objects_initial = nr_objects;
1249 if (nr_unresolved <= 0)
1250 die(_("confusion beyond insanity"));
1251 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1252 memset(objects + nr_objects + 1, 0,
1253 nr_unresolved * sizeof(*objects));
1254 f = sha1fd(output_fd, curr_pack);
1255 fix_unresolved_deltas(f);
1256 strbuf_addf(&msg, Q_("completed with %d local object",
1257 "completed with %d local objects",
1258 nr_objects - nr_objects_initial),
1259 nr_objects - nr_objects_initial);
1260 stop_progress_msg(&progress, msg.buf);
1261 strbuf_release(&msg);
1262 sha1close(f, tail_sha1, 0);
1263 hashcpy(read_sha1, pack_sha1);
1264 fixup_pack_header_footer(output_fd, pack_sha1,
1265 curr_pack, nr_objects,
1266 read_sha1, consumed_bytes-20);
1267 if (hashcmp(read_sha1, tail_sha1) != 0)
1268 die(_("Unexpected tail checksum for %s "
1269 "(disk corruption?)"), curr_pack);
1270 }
1271 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1272 die(Q_("pack has %d unresolved delta",
1273 "pack has %d unresolved deltas",
1274 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1275 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1276 }
1277
1278 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1279 {
1280 git_zstream stream;
1281 int status;
1282 unsigned char outbuf[4096];
1283
1284 git_deflate_init(&stream, zlib_compression_level);
1285 stream.next_in = in;
1286 stream.avail_in = size;
1287
1288 do {
1289 stream.next_out = outbuf;
1290 stream.avail_out = sizeof(outbuf);
1291 status = git_deflate(&stream, Z_FINISH);
1292 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1293 } while (status == Z_OK);
1294
1295 if (status != Z_STREAM_END)
1296 die(_("unable to deflate appended object (%d)"), status);
1297 size = stream.total_out;
1298 git_deflate_end(&stream);
1299 return size;
1300 }
1301
1302 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1303 const unsigned char *sha1, void *buf,
1304 unsigned long size, enum object_type type)
1305 {
1306 struct object_entry *obj = &objects[nr_objects++];
1307 unsigned char header[10];
1308 unsigned long s = size;
1309 int n = 0;
1310 unsigned char c = (type << 4) | (s & 15);
1311 s >>= 4;
1312 while (s) {
1313 header[n++] = c | 0x80;
1314 c = s & 0x7f;
1315 s >>= 7;
1316 }
1317 header[n++] = c;
1318 crc32_begin(f);
1319 sha1write(f, header, n);
1320 obj[0].size = size;
1321 obj[0].hdr_size = n;
1322 obj[0].type = type;
1323 obj[0].real_type = type;
1324 obj[1].idx.offset = obj[0].idx.offset + n;
1325 obj[1].idx.offset += write_compressed(f, buf, size);
1326 obj[0].idx.crc32 = crc32_end(f);
1327 sha1flush(f);
1328 hashcpy(obj->idx.sha1, sha1);
1329 return obj;
1330 }
1331
1332 static int delta_pos_compare(const void *_a, const void *_b)
1333 {
1334 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1335 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1336 return a->obj_no - b->obj_no;
1337 }
1338
1339 static void fix_unresolved_deltas(struct sha1file *f)
1340 {
1341 struct ref_delta_entry **sorted_by_pos;
1342 int i;
1343
1344 /*
1345 * Since many unresolved deltas may well be themselves base objects
1346 * for more unresolved deltas, we really want to include the
1347 * smallest number of base objects that would cover as much delta
1348 * as possible by picking the
1349 * trunc deltas first, allowing for other deltas to resolve without
1350 * additional base objects. Since most base objects are to be found
1351 * before deltas depending on them, a good heuristic is to start
1352 * resolving deltas in the same order as their position in the pack.
1353 */
1354 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1355 for (i = 0; i < nr_ref_deltas; i++)
1356 sorted_by_pos[i] = &ref_deltas[i];
1357 QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
1358
1359 for (i = 0; i < nr_ref_deltas; i++) {
1360 struct ref_delta_entry *d = sorted_by_pos[i];
1361 enum object_type type;
1362 struct base_data *base_obj = alloc_base_data();
1363
1364 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1365 continue;
1366 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1367 if (!base_obj->data)
1368 continue;
1369
1370 if (check_sha1_signature(d->sha1, base_obj->data,
1371 base_obj->size, typename(type)))
1372 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1373 base_obj->obj = append_obj_to_pack(f, d->sha1,
1374 base_obj->data, base_obj->size, type);
1375 find_unresolved_deltas(base_obj);
1376 display_progress(progress, nr_resolved_deltas);
1377 }
1378 free(sorted_by_pos);
1379 }
1380
1381 static void final(const char *final_pack_name, const char *curr_pack_name,
1382 const char *final_index_name, const char *curr_index_name,
1383 const char *keep_name, const char *keep_msg,
1384 unsigned char *sha1)
1385 {
1386 const char *report = "pack";
1387 char name[PATH_MAX];
1388 int err;
1389
1390 if (!from_stdin) {
1391 close(input_fd);
1392 } else {
1393 fsync_or_die(output_fd, curr_pack_name);
1394 err = close(output_fd);
1395 if (err)
1396 die_errno(_("error while closing pack file"));
1397 }
1398
1399 if (keep_msg) {
1400 int keep_fd, keep_msg_len = strlen(keep_msg);
1401
1402 if (!keep_name)
1403 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1404 else
1405 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1406
1407 if (keep_fd < 0) {
1408 if (errno != EEXIST)
1409 die_errno(_("cannot write keep file '%s'"),
1410 keep_name ? keep_name : name);
1411 } else {
1412 if (keep_msg_len > 0) {
1413 write_or_die(keep_fd, keep_msg, keep_msg_len);
1414 write_or_die(keep_fd, "\n", 1);
1415 }
1416 if (close(keep_fd) != 0)
1417 die_errno(_("cannot close written keep file '%s'"),
1418 keep_name ? keep_name : name);
1419 report = "keep";
1420 }
1421 }
1422
1423 if (final_pack_name != curr_pack_name) {
1424 if (!final_pack_name) {
1425 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1426 get_object_directory(), sha1_to_hex(sha1));
1427 final_pack_name = name;
1428 }
1429 if (finalize_object_file(curr_pack_name, final_pack_name))
1430 die(_("cannot store pack file"));
1431 } else if (from_stdin)
1432 chmod(final_pack_name, 0444);
1433
1434 if (final_index_name != curr_index_name) {
1435 if (!final_index_name) {
1436 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1437 get_object_directory(), sha1_to_hex(sha1));
1438 final_index_name = name;
1439 }
1440 if (finalize_object_file(curr_index_name, final_index_name))
1441 die(_("cannot store index file"));
1442 } else
1443 chmod(final_index_name, 0444);
1444
1445 if (!from_stdin) {
1446 printf("%s\n", sha1_to_hex(sha1));
1447 } else {
1448 char buf[48];
1449 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1450 report, sha1_to_hex(sha1));
1451 write_or_die(1, buf, len);
1452
1453 /*
1454 * Let's just mimic git-unpack-objects here and write
1455 * the last part of the input buffer to stdout.
1456 */
1457 while (input_len) {
1458 err = xwrite(1, input_buffer + input_offset, input_len);
1459 if (err <= 0)
1460 break;
1461 input_len -= err;
1462 input_offset += err;
1463 }
1464 }
1465 }
1466
1467 static int git_index_pack_config(const char *k, const char *v, void *cb)
1468 {
1469 struct pack_idx_option *opts = cb;
1470
1471 if (!strcmp(k, "pack.indexversion")) {
1472 opts->version = git_config_int(k, v);
1473 if (opts->version > 2)
1474 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1475 return 0;
1476 }
1477 if (!strcmp(k, "pack.threads")) {
1478 nr_threads = git_config_int(k, v);
1479 if (nr_threads < 0)
1480 die(_("invalid number of threads specified (%d)"),
1481 nr_threads);
1482 #ifdef NO_PTHREADS
1483 if (nr_threads != 1)
1484 warning(_("no threads support, ignoring %s"), k);
1485 nr_threads = 1;
1486 #endif
1487 return 0;
1488 }
1489 return git_default_config(k, v, cb);
1490 }
1491
1492 static int cmp_uint32(const void *a_, const void *b_)
1493 {
1494 uint32_t a = *((uint32_t *)a_);
1495 uint32_t b = *((uint32_t *)b_);
1496
1497 return (a < b) ? -1 : (a != b);
1498 }
1499
1500 static void read_v2_anomalous_offsets(struct packed_git *p,
1501 struct pack_idx_option *opts)
1502 {
1503 const uint32_t *idx1, *idx2;
1504 uint32_t i;
1505
1506 /* The address of the 4-byte offset table */
1507 idx1 = (((const uint32_t *)p->index_data)
1508 + 2 /* 8-byte header */
1509 + 256 /* fan out */
1510 + 5 * p->num_objects /* 20-byte SHA-1 table */
1511 + p->num_objects /* CRC32 table */
1512 );
1513
1514 /* The address of the 8-byte offset table */
1515 idx2 = idx1 + p->num_objects;
1516
1517 for (i = 0; i < p->num_objects; i++) {
1518 uint32_t off = ntohl(idx1[i]);
1519 if (!(off & 0x80000000))
1520 continue;
1521 off = off & 0x7fffffff;
1522 check_pack_index_ptr(p, &idx2[off * 2]);
1523 if (idx2[off * 2])
1524 continue;
1525 /*
1526 * The real offset is ntohl(idx2[off * 2]) in high 4
1527 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1528 * octets. But idx2[off * 2] is Zero!!!
1529 */
1530 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1531 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1532 }
1533
1534 QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
1535 }
1536
1537 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1538 {
1539 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1540
1541 if (!p)
1542 die(_("Cannot open existing pack file '%s'"), pack_name);
1543 if (open_pack_index(p))
1544 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1545
1546 /* Read the attributes from the existing idx file */
1547 opts->version = p->index_version;
1548
1549 if (opts->version == 2)
1550 read_v2_anomalous_offsets(p, opts);
1551
1552 /*
1553 * Get rid of the idx file as we do not need it anymore.
1554 * NEEDSWORK: extract this bit from free_pack_by_name() in
1555 * sha1_file.c, perhaps? It shouldn't matter very much as we
1556 * know we haven't installed this pack (hence we never have
1557 * read anything from it).
1558 */
1559 close_pack_index(p);
1560 free(p);
1561 }
1562
1563 static void show_pack_info(int stat_only)
1564 {
1565 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1566 unsigned long *chain_histogram = NULL;
1567
1568 if (deepest_delta)
1569 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1570
1571 for (i = 0; i < nr_objects; i++) {
1572 struct object_entry *obj = &objects[i];
1573
1574 if (is_delta_type(obj->type))
1575 chain_histogram[obj_stat[i].delta_depth - 1]++;
1576 if (stat_only)
1577 continue;
1578 printf("%s %-6s %lu %lu %"PRIuMAX,
1579 sha1_to_hex(obj->idx.sha1),
1580 typename(obj->real_type), obj->size,
1581 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1582 (uintmax_t)obj->idx.offset);
1583 if (is_delta_type(obj->type)) {
1584 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1585 printf(" %u %s", obj_stat[i].delta_depth, sha1_to_hex(bobj->idx.sha1));
1586 }
1587 putchar('\n');
1588 }
1589
1590 if (baseobjects)
1591 printf_ln(Q_("non delta: %d object",
1592 "non delta: %d objects",
1593 baseobjects),
1594 baseobjects);
1595 for (i = 0; i < deepest_delta; i++) {
1596 if (!chain_histogram[i])
1597 continue;
1598 printf_ln(Q_("chain length = %d: %lu object",
1599 "chain length = %d: %lu objects",
1600 chain_histogram[i]),
1601 i + 1,
1602 chain_histogram[i]);
1603 }
1604 }
1605
1606 static const char *derive_filename(const char *pack_name, const char *suffix,
1607 struct strbuf *buf)
1608 {
1609 size_t len;
1610 if (!strip_suffix(pack_name, ".pack", &len))
1611 die(_("packfile name '%s' does not end with '.pack'"),
1612 pack_name);
1613 strbuf_add(buf, pack_name, len);
1614 strbuf_addstr(buf, suffix);
1615 return buf->buf;
1616 }
1617
1618 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1619 {
1620 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1621 const char *curr_index;
1622 const char *index_name = NULL, *pack_name = NULL;
1623 const char *keep_name = NULL, *keep_msg = NULL;
1624 struct strbuf index_name_buf = STRBUF_INIT,
1625 keep_name_buf = STRBUF_INIT;
1626 struct pack_idx_entry **idx_objects;
1627 struct pack_idx_option opts;
1628 unsigned char pack_sha1[20];
1629 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1630 int report_end_of_input = 0;
1631
1632 if (argc == 2 && !strcmp(argv[1], "-h"))
1633 usage(index_pack_usage);
1634
1635 check_replace_refs = 0;
1636 fsck_options.walk = mark_link;
1637
1638 reset_pack_idx_option(&opts);
1639 git_config(git_index_pack_config, &opts);
1640 if (prefix && chdir(prefix))
1641 die(_("Cannot come back to cwd"));
1642
1643 for (i = 1; i < argc; i++) {
1644 const char *arg = argv[i];
1645
1646 if (*arg == '-') {
1647 if (!strcmp(arg, "--stdin")) {
1648 from_stdin = 1;
1649 } else if (!strcmp(arg, "--fix-thin")) {
1650 fix_thin_pack = 1;
1651 } else if (!strcmp(arg, "--strict")) {
1652 strict = 1;
1653 do_fsck_object = 1;
1654 } else if (skip_prefix(arg, "--strict=", &arg)) {
1655 strict = 1;
1656 do_fsck_object = 1;
1657 fsck_set_msg_types(&fsck_options, arg);
1658 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1659 strict = 1;
1660 check_self_contained_and_connected = 1;
1661 } else if (!strcmp(arg, "--verify")) {
1662 verify = 1;
1663 } else if (!strcmp(arg, "--verify-stat")) {
1664 verify = 1;
1665 show_stat = 1;
1666 } else if (!strcmp(arg, "--verify-stat-only")) {
1667 verify = 1;
1668 show_stat = 1;
1669 stat_only = 1;
1670 } else if (!strcmp(arg, "--keep")) {
1671 keep_msg = "";
1672 } else if (starts_with(arg, "--keep=")) {
1673 keep_msg = arg + 7;
1674 } else if (starts_with(arg, "--threads=")) {
1675 char *end;
1676 nr_threads = strtoul(arg+10, &end, 0);
1677 if (!arg[10] || *end || nr_threads < 0)
1678 usage(index_pack_usage);
1679 #ifdef NO_PTHREADS
1680 if (nr_threads != 1)
1681 warning(_("no threads support, "
1682 "ignoring %s"), arg);
1683 nr_threads = 1;
1684 #endif
1685 } else if (starts_with(arg, "--pack_header=")) {
1686 struct pack_header *hdr;
1687 char *c;
1688
1689 hdr = (struct pack_header *)input_buffer;
1690 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1691 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1692 if (*c != ',')
1693 die(_("bad %s"), arg);
1694 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1695 if (*c)
1696 die(_("bad %s"), arg);
1697 input_len = sizeof(*hdr);
1698 } else if (!strcmp(arg, "-v")) {
1699 verbose = 1;
1700 } else if (!strcmp(arg, "--show-resolving-progress")) {
1701 show_resolving_progress = 1;
1702 } else if (!strcmp(arg, "--report-end-of-input")) {
1703 report_end_of_input = 1;
1704 } else if (!strcmp(arg, "-o")) {
1705 if (index_name || (i+1) >= argc)
1706 usage(index_pack_usage);
1707 index_name = argv[++i];
1708 } else if (starts_with(arg, "--index-version=")) {
1709 char *c;
1710 opts.version = strtoul(arg + 16, &c, 10);
1711 if (opts.version > 2)
1712 die(_("bad %s"), arg);
1713 if (*c == ',')
1714 opts.off32_limit = strtoul(c+1, &c, 0);
1715 if (*c || opts.off32_limit & 0x80000000)
1716 die(_("bad %s"), arg);
1717 } else if (skip_prefix(arg, "--max-input-size=", &arg)) {
1718 max_input_size = strtoumax(arg, NULL, 10);
1719 } else
1720 usage(index_pack_usage);
1721 continue;
1722 }
1723
1724 if (pack_name)
1725 usage(index_pack_usage);
1726 pack_name = arg;
1727 }
1728
1729 if (!pack_name && !from_stdin)
1730 usage(index_pack_usage);
1731 if (fix_thin_pack && !from_stdin)
1732 die(_("--fix-thin cannot be used without --stdin"));
1733 if (!index_name && pack_name)
1734 index_name = derive_filename(pack_name, ".idx", &index_name_buf);
1735 if (keep_msg && !keep_name && pack_name)
1736 keep_name = derive_filename(pack_name, ".keep", &keep_name_buf);
1737
1738 if (verify) {
1739 if (!index_name)
1740 die(_("--verify with no packfile name given"));
1741 read_idx_option(&opts, index_name);
1742 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1743 }
1744 if (strict)
1745 opts.flags |= WRITE_IDX_STRICT;
1746
1747 #ifndef NO_PTHREADS
1748 if (!nr_threads) {
1749 nr_threads = online_cpus();
1750 /* An experiment showed that more threads does not mean faster */
1751 if (nr_threads > 3)
1752 nr_threads = 3;
1753 }
1754 #endif
1755
1756 curr_pack = open_pack_file(pack_name);
1757 parse_pack_header();
1758 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1759 if (show_stat)
1760 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1761 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1762 parse_pack_objects(pack_sha1);
1763 if (report_end_of_input)
1764 write_in_full(2, "\0", 1);
1765 resolve_deltas();
1766 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1767 free(ofs_deltas);
1768 free(ref_deltas);
1769 if (strict)
1770 foreign_nr = check_objects();
1771
1772 if (show_stat)
1773 show_pack_info(stat_only);
1774
1775 ALLOC_ARRAY(idx_objects, nr_objects);
1776 for (i = 0; i < nr_objects; i++)
1777 idx_objects[i] = &objects[i].idx;
1778 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1779 free(idx_objects);
1780
1781 if (!verify)
1782 final(pack_name, curr_pack,
1783 index_name, curr_index,
1784 keep_name, keep_msg,
1785 pack_sha1);
1786 else
1787 close(input_fd);
1788 free(objects);
1789 strbuf_release(&index_name_buf);
1790 strbuf_release(&keep_name_buf);
1791 if (pack_name == NULL)
1792 free((void *) curr_pack);
1793 if (index_name == NULL)
1794 free((void *) curr_index);
1795
1796 /*
1797 * Let the caller know this pack is not self contained
1798 */
1799 if (check_self_contained_and_connected && foreign_nr)
1800 return 1;
1801
1802 return 0;
1803 }
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