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sha1_file: do not access pack if unneeded
[git/debian.git] / builtin / index-pack.c
blob04b9dcaf0f4ca90712cbb85cace521e226194f3b
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 struct strbuf tmp_file = STRBUF_INIT;
311 output_fd = odb_mkstemp(&tmp_file,
312 "pack/tmp_pack_XXXXXX");
313 pack_name = strbuf_detach(&tmp_file, NULL);
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 }
319 nothread_data.pack_fd = output_fd;
320 } else {
321 input_fd = open(pack_name, O_RDONLY);
322 if (input_fd < 0)
323 die_errno(_("cannot open packfile '%s'"), pack_name);
324 output_fd = -1;
325 nothread_data.pack_fd = input_fd;
326 }
327 git_SHA1_Init(&input_ctx);
328 return pack_name;
329 }
330
331 static void parse_pack_header(void)
332 {
333 struct pack_header *hdr = fill(sizeof(struct pack_header));
334
335 /* Header consistency check */
336 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
337 die(_("pack signature mismatch"));
338 if (!pack_version_ok(hdr->hdr_version))
339 die(_("pack version %"PRIu32" unsupported"),
340 ntohl(hdr->hdr_version));
341
342 nr_objects = ntohl(hdr->hdr_entries);
343 use(sizeof(struct pack_header));
344 }
345
346 static NORETURN void bad_object(off_t offset, const char *format,
347 ...) __attribute__((format (printf, 2, 3)));
348
349 static NORETURN void bad_object(off_t offset, const char *format, ...)
350 {
351 va_list params;
352 char buf[1024];
353
354 va_start(params, format);
355 vsnprintf(buf, sizeof(buf), format, params);
356 va_end(params);
357 die(_("pack has bad object at offset %"PRIuMAX": %s"),
358 (uintmax_t)offset, buf);
359 }
360
361 static inline struct thread_local *get_thread_data(void)
362 {
363 #ifndef NO_PTHREADS
364 if (threads_active)
365 return pthread_getspecific(key);
366 assert(!threads_active &&
367 "This should only be reached when all threads are gone");
368 #endif
369 return &nothread_data;
370 }
371
372 #ifndef NO_PTHREADS
373 static void set_thread_data(struct thread_local *data)
374 {
375 if (threads_active)
376 pthread_setspecific(key, data);
377 }
378 #endif
379
380 static struct base_data *alloc_base_data(void)
381 {
382 struct base_data *base = xcalloc(1, sizeof(struct base_data));
383 base->ref_last = -1;
384 base->ofs_last = -1;
385 return base;
386 }
387
388 static void free_base_data(struct base_data *c)
389 {
390 if (c->data) {
391 free(c->data);
392 c->data = NULL;
393 get_thread_data()->base_cache_used -= c->size;
394 }
395 }
396
397 static void prune_base_data(struct base_data *retain)
398 {
399 struct base_data *b;
400 struct thread_local *data = get_thread_data();
401 for (b = data->base_cache;
402 data->base_cache_used > delta_base_cache_limit && b;
403 b = b->child) {
404 if (b->data && b != retain)
405 free_base_data(b);
406 }
407 }
408
409 static void link_base_data(struct base_data *base, struct base_data *c)
410 {
411 if (base)
412 base->child = c;
413 else
414 get_thread_data()->base_cache = c;
415
416 c->base = base;
417 c->child = NULL;
418 if (c->data)
419 get_thread_data()->base_cache_used += c->size;
420 prune_base_data(c);
421 }
422
423 static void unlink_base_data(struct base_data *c)
424 {
425 struct base_data *base = c->base;
426 if (base)
427 base->child = NULL;
428 else
429 get_thread_data()->base_cache = NULL;
430 free_base_data(c);
431 }
432
433 static int is_delta_type(enum object_type type)
434 {
435 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
436 }
437
438 static void *unpack_entry_data(off_t offset, unsigned long size,
439 enum object_type type, unsigned char *sha1)
440 {
441 static char fixed_buf[8192];
442 int status;
443 git_zstream stream;
444 void *buf;
445 git_SHA_CTX c;
446 char hdr[32];
447 int hdrlen;
448
449 if (!is_delta_type(type)) {
450 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), size) + 1;
451 git_SHA1_Init(&c);
452 git_SHA1_Update(&c, hdr, hdrlen);
453 } else
454 sha1 = NULL;
455 if (type == OBJ_BLOB && size > big_file_threshold)
456 buf = fixed_buf;
457 else
458 buf = xmallocz(size);
459
460 memset(&stream, 0, sizeof(stream));
461 git_inflate_init(&stream);
462 stream.next_out = buf;
463 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
464
465 do {
466 unsigned char *last_out = stream.next_out;
467 stream.next_in = fill(1);
468 stream.avail_in = input_len;
469 status = git_inflate(&stream, 0);
470 use(input_len - stream.avail_in);
471 if (sha1)
472 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
473 if (buf == fixed_buf) {
474 stream.next_out = buf;
475 stream.avail_out = sizeof(fixed_buf);
476 }
477 } while (status == Z_OK);
478 if (stream.total_out != size || status != Z_STREAM_END)
479 bad_object(offset, _("inflate returned %d"), status);
480 git_inflate_end(&stream);
481 if (sha1)
482 git_SHA1_Final(sha1, &c);
483 return buf == fixed_buf ? NULL : buf;
484 }
485
486 static void *unpack_raw_entry(struct object_entry *obj,
487 off_t *ofs_offset,
488 unsigned char *ref_sha1,
489 unsigned char *sha1)
490 {
491 unsigned char *p;
492 unsigned long size, c;
493 off_t base_offset;
494 unsigned shift;
495 void *data;
496
497 obj->idx.offset = consumed_bytes;
498 input_crc32 = crc32(0, NULL, 0);
499
500 p = fill(1);
501 c = *p;
502 use(1);
503 obj->type = (c >> 4) & 7;
504 size = (c & 15);
505 shift = 4;
506 while (c & 0x80) {
507 p = fill(1);
508 c = *p;
509 use(1);
510 size += (c & 0x7f) << shift;
511 shift += 7;
512 }
513 obj->size = size;
514
515 switch (obj->type) {
516 case OBJ_REF_DELTA:
517 hashcpy(ref_sha1, fill(20));
518 use(20);
519 break;
520 case OBJ_OFS_DELTA:
521 p = fill(1);
522 c = *p;
523 use(1);
524 base_offset = c & 127;
525 while (c & 128) {
526 base_offset += 1;
527 if (!base_offset || MSB(base_offset, 7))
528 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
529 p = fill(1);
530 c = *p;
531 use(1);
532 base_offset = (base_offset << 7) + (c & 127);
533 }
534 *ofs_offset = obj->idx.offset - base_offset;
535 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
536 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
537 break;
538 case OBJ_COMMIT:
539 case OBJ_TREE:
540 case OBJ_BLOB:
541 case OBJ_TAG:
542 break;
543 default:
544 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
545 }
546 obj->hdr_size = consumed_bytes - obj->idx.offset;
547
548 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
549 obj->idx.crc32 = input_crc32;
550 return data;
551 }
552
553 static void *unpack_data(struct object_entry *obj,
554 int (*consume)(const unsigned char *, unsigned long, void *),
555 void *cb_data)
556 {
557 off_t from = obj[0].idx.offset + obj[0].hdr_size;
558 off_t len = obj[1].idx.offset - from;
559 unsigned char *data, *inbuf;
560 git_zstream stream;
561 int status;
562
563 data = xmallocz(consume ? 64*1024 : obj->size);
564 inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
565
566 memset(&stream, 0, sizeof(stream));
567 git_inflate_init(&stream);
568 stream.next_out = data;
569 stream.avail_out = consume ? 64*1024 : obj->size;
570
571 do {
572 ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
573 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
574 if (n < 0)
575 die_errno(_("cannot pread pack file"));
576 if (!n)
577 die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
578 "premature end of pack file, %"PRIuMAX" bytes missing",
579 (unsigned int)len),
580 (uintmax_t)len);
581 from += n;
582 len -= n;
583 stream.next_in = inbuf;
584 stream.avail_in = n;
585 if (!consume)
586 status = git_inflate(&stream, 0);
587 else {
588 do {
589 status = git_inflate(&stream, 0);
590 if (consume(data, stream.next_out - data, cb_data)) {
591 free(inbuf);
592 free(data);
593 return NULL;
594 }
595 stream.next_out = data;
596 stream.avail_out = 64*1024;
597 } while (status == Z_OK && stream.avail_in);
598 }
599 } while (len && status == Z_OK && !stream.avail_in);
600
601 /* This has been inflated OK when first encountered, so... */
602 if (status != Z_STREAM_END || stream.total_out != obj->size)
603 die(_("serious inflate inconsistency"));
604
605 git_inflate_end(&stream);
606 free(inbuf);
607 if (consume) {
608 free(data);
609 data = NULL;
610 }
611 return data;
612 }
613
614 static void *get_data_from_pack(struct object_entry *obj)
615 {
616 return unpack_data(obj, NULL, NULL);
617 }
618
619 static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
620 enum object_type type1,
621 enum object_type type2)
622 {
623 int cmp = type1 - type2;
624 if (cmp)
625 return cmp;
626 return offset1 < offset2 ? -1 :
627 offset1 > offset2 ? 1 :
628 0;
629 }
630
631 static int find_ofs_delta(const off_t offset, enum object_type type)
632 {
633 int first = 0, last = nr_ofs_deltas;
634
635 while (first < last) {
636 int next = (first + last) / 2;
637 struct ofs_delta_entry *delta = &ofs_deltas[next];
638 int cmp;
639
640 cmp = compare_ofs_delta_bases(offset, delta->offset,
641 type, objects[delta->obj_no].type);
642 if (!cmp)
643 return next;
644 if (cmp < 0) {
645 last = next;
646 continue;
647 }
648 first = next+1;
649 }
650 return -first-1;
651 }
652
653 static void find_ofs_delta_children(off_t offset,
654 int *first_index, int *last_index,
655 enum object_type type)
656 {
657 int first = find_ofs_delta(offset, type);
658 int last = first;
659 int end = nr_ofs_deltas - 1;
660
661 if (first < 0) {
662 *first_index = 0;
663 *last_index = -1;
664 return;
665 }
666 while (first > 0 && ofs_deltas[first - 1].offset == offset)
667 --first;
668 while (last < end && ofs_deltas[last + 1].offset == offset)
669 ++last;
670 *first_index = first;
671 *last_index = last;
672 }
673
674 static int compare_ref_delta_bases(const unsigned char *sha1,
675 const unsigned char *sha2,
676 enum object_type type1,
677 enum object_type type2)
678 {
679 int cmp = type1 - type2;
680 if (cmp)
681 return cmp;
682 return hashcmp(sha1, sha2);
683 }
684
685 static int find_ref_delta(const unsigned char *sha1, enum object_type type)
686 {
687 int first = 0, last = nr_ref_deltas;
688
689 while (first < last) {
690 int next = (first + last) / 2;
691 struct ref_delta_entry *delta = &ref_deltas[next];
692 int cmp;
693
694 cmp = compare_ref_delta_bases(sha1, delta->sha1,
695 type, objects[delta->obj_no].type);
696 if (!cmp)
697 return next;
698 if (cmp < 0) {
699 last = next;
700 continue;
701 }
702 first = next+1;
703 }
704 return -first-1;
705 }
706
707 static void find_ref_delta_children(const unsigned char *sha1,
708 int *first_index, int *last_index,
709 enum object_type type)
710 {
711 int first = find_ref_delta(sha1, type);
712 int last = first;
713 int end = nr_ref_deltas - 1;
714
715 if (first < 0) {
716 *first_index = 0;
717 *last_index = -1;
718 return;
719 }
720 while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
721 --first;
722 while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
723 ++last;
724 *first_index = first;
725 *last_index = last;
726 }
727
728 struct compare_data {
729 struct object_entry *entry;
730 struct git_istream *st;
731 unsigned char *buf;
732 unsigned long buf_size;
733 };
734
735 static int compare_objects(const unsigned char *buf, unsigned long size,
736 void *cb_data)
737 {
738 struct compare_data *data = cb_data;
739
740 if (data->buf_size < size) {
741 free(data->buf);
742 data->buf = xmalloc(size);
743 data->buf_size = size;
744 }
745
746 while (size) {
747 ssize_t len = read_istream(data->st, data->buf, size);
748 if (len == 0)
749 die(_("SHA1 COLLISION FOUND WITH %s !"),
750 oid_to_hex(&data->entry->idx.oid));
751 if (len < 0)
752 die(_("unable to read %s"),
753 oid_to_hex(&data->entry->idx.oid));
754 if (memcmp(buf, data->buf, len))
755 die(_("SHA1 COLLISION FOUND WITH %s !"),
756 oid_to_hex(&data->entry->idx.oid));
757 size -= len;
758 buf += len;
759 }
760 return 0;
761 }
762
763 static int check_collison(struct object_entry *entry)
764 {
765 struct compare_data data;
766 enum object_type type;
767 unsigned long size;
768
769 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
770 return -1;
771
772 memset(&data, 0, sizeof(data));
773 data.entry = entry;
774 data.st = open_istream(entry->idx.oid.hash, &type, &size, NULL);
775 if (!data.st)
776 return -1;
777 if (size != entry->size || type != entry->type)
778 die(_("SHA1 COLLISION FOUND WITH %s !"),
779 oid_to_hex(&entry->idx.oid));
780 unpack_data(entry, compare_objects, &data);
781 close_istream(data.st);
782 free(data.buf);
783 return 0;
784 }
785
786 static void sha1_object(const void *data, struct object_entry *obj_entry,
787 unsigned long size, enum object_type type,
788 const struct object_id *oid)
789 {
790 void *new_data = NULL;
791 int collision_test_needed = 0;
792
793 assert(data || obj_entry);
794
795 if (startup_info->have_repository) {
796 read_lock();
797 collision_test_needed = has_sha1_file_with_flags(oid->hash, HAS_SHA1_QUICK);
798 read_unlock();
799 }
800
801 if (collision_test_needed && !data) {
802 read_lock();
803 if (!check_collison(obj_entry))
804 collision_test_needed = 0;
805 read_unlock();
806 }
807 if (collision_test_needed) {
808 void *has_data;
809 enum object_type has_type;
810 unsigned long has_size;
811 read_lock();
812 has_type = sha1_object_info(oid->hash, &has_size);
813 if (has_type < 0)
814 die(_("cannot read existing object info %s"), oid_to_hex(oid));
815 if (has_type != type || has_size != size)
816 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
817 has_data = read_sha1_file(oid->hash, &has_type, &has_size);
818 read_unlock();
819 if (!data)
820 data = new_data = get_data_from_pack(obj_entry);
821 if (!has_data)
822 die(_("cannot read existing object %s"), oid_to_hex(oid));
823 if (size != has_size || type != has_type ||
824 memcmp(data, has_data, size) != 0)
825 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
826 free(has_data);
827 }
828
829 if (strict) {
830 read_lock();
831 if (type == OBJ_BLOB) {
832 struct blob *blob = lookup_blob(oid);
833 if (blob)
834 blob->object.flags |= FLAG_CHECKED;
835 else
836 die(_("invalid blob object %s"), oid_to_hex(oid));
837 } else {
838 struct object *obj;
839 int eaten;
840 void *buf = (void *) data;
841
842 assert(data && "data can only be NULL for large _blobs_");
843
844 /*
845 * we do not need to free the memory here, as the
846 * buf is deleted by the caller.
847 */
848 obj = parse_object_buffer(oid, type, size, buf,
849 &eaten);
850 if (!obj)
851 die(_("invalid %s"), typename(type));
852 if (do_fsck_object &&
853 fsck_object(obj, buf, size, &fsck_options))
854 die(_("Error in object"));
855 if (fsck_walk(obj, NULL, &fsck_options))
856 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
857
858 if (obj->type == OBJ_TREE) {
859 struct tree *item = (struct tree *) obj;
860 item->buffer = NULL;
861 obj->parsed = 0;
862 }
863 if (obj->type == OBJ_COMMIT) {
864 struct commit *commit = (struct commit *) obj;
865 if (detach_commit_buffer(commit, NULL) != data)
866 die("BUG: parse_object_buffer transmogrified our buffer");
867 }
868 obj->flags |= FLAG_CHECKED;
869 }
870 read_unlock();
871 }
872
873 free(new_data);
874 }
875
876 /*
877 * This function is part of find_unresolved_deltas(). There are two
878 * walkers going in the opposite ways.
879 *
880 * The first one in find_unresolved_deltas() traverses down from
881 * parent node to children, deflating nodes along the way. However,
882 * memory for deflated nodes is limited by delta_base_cache_limit, so
883 * at some point parent node's deflated content may be freed.
884 *
885 * The second walker is this function, which goes from current node up
886 * to top parent if necessary to deflate the node. In normal
887 * situation, its parent node would be already deflated, so it just
888 * needs to apply delta.
889 *
890 * In the worst case scenario, parent node is no longer deflated because
891 * we're running out of delta_base_cache_limit; we need to re-deflate
892 * parents, possibly up to the top base.
893 *
894 * All deflated objects here are subject to be freed if we exceed
895 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
896 * just need to make sure the last node is not freed.
897 */
898 static void *get_base_data(struct base_data *c)
899 {
900 if (!c->data) {
901 struct object_entry *obj = c->obj;
902 struct base_data **delta = NULL;
903 int delta_nr = 0, delta_alloc = 0;
904
905 while (is_delta_type(c->obj->type) && !c->data) {
906 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
907 delta[delta_nr++] = c;
908 c = c->base;
909 }
910 if (!delta_nr) {
911 c->data = get_data_from_pack(obj);
912 c->size = obj->size;
913 get_thread_data()->base_cache_used += c->size;
914 prune_base_data(c);
915 }
916 for (; delta_nr > 0; delta_nr--) {
917 void *base, *raw;
918 c = delta[delta_nr - 1];
919 obj = c->obj;
920 base = get_base_data(c->base);
921 raw = get_data_from_pack(obj);
922 c->data = patch_delta(
923 base, c->base->size,
924 raw, obj->size,
925 &c->size);
926 free(raw);
927 if (!c->data)
928 bad_object(obj->idx.offset, _("failed to apply delta"));
929 get_thread_data()->base_cache_used += c->size;
930 prune_base_data(c);
931 }
932 free(delta);
933 }
934 return c->data;
935 }
936
937 static void resolve_delta(struct object_entry *delta_obj,
938 struct base_data *base, struct base_data *result)
939 {
940 void *base_data, *delta_data;
941
942 if (show_stat) {
943 int i = delta_obj - objects;
944 int j = base->obj - objects;
945 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
946 deepest_delta_lock();
947 if (deepest_delta < obj_stat[i].delta_depth)
948 deepest_delta = obj_stat[i].delta_depth;
949 deepest_delta_unlock();
950 obj_stat[i].base_object_no = j;
951 }
952 delta_data = get_data_from_pack(delta_obj);
953 base_data = get_base_data(base);
954 result->obj = delta_obj;
955 result->data = patch_delta(base_data, base->size,
956 delta_data, delta_obj->size, &result->size);
957 free(delta_data);
958 if (!result->data)
959 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
960 hash_sha1_file(result->data, result->size,
961 typename(delta_obj->real_type),
962 delta_obj->idx.oid.hash);
963 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
964 &delta_obj->idx.oid);
965 counter_lock();
966 nr_resolved_deltas++;
967 counter_unlock();
968 }
969
970 /*
971 * Standard boolean compare-and-swap: atomically check whether "*type" is
972 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
973 * and return false.
974 */
975 static int compare_and_swap_type(signed char *type,
976 enum object_type want,
977 enum object_type set)
978 {
979 enum object_type old;
980
981 type_cas_lock();
982 old = *type;
983 if (old == want)
984 *type = set;
985 type_cas_unlock();
986
987 return old == want;
988 }
989
990 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
991 struct base_data *prev_base)
992 {
993 if (base->ref_last == -1 && base->ofs_last == -1) {
994 find_ref_delta_children(base->obj->idx.oid.hash,
995 &base->ref_first, &base->ref_last,
996 OBJ_REF_DELTA);
997
998 find_ofs_delta_children(base->obj->idx.offset,
999 &base->ofs_first, &base->ofs_last,
1000 OBJ_OFS_DELTA);
1001
1002 if (base->ref_last == -1 && base->ofs_last == -1) {
1003 free(base->data);
1004 return NULL;
1005 }
1006
1007 link_base_data(prev_base, base);
1008 }
1009
1010 if (base->ref_first <= base->ref_last) {
1011 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1012 struct base_data *result = alloc_base_data();
1013
1014 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1015 base->obj->real_type))
1016 die("BUG: child->real_type != OBJ_REF_DELTA");
1017
1018 resolve_delta(child, base, result);
1019 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1020 free_base_data(base);
1021
1022 base->ref_first++;
1023 return result;
1024 }
1025
1026 if (base->ofs_first <= base->ofs_last) {
1027 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1028 struct base_data *result = alloc_base_data();
1029
1030 assert(child->real_type == OBJ_OFS_DELTA);
1031 child->real_type = base->obj->real_type;
1032 resolve_delta(child, base, result);
1033 if (base->ofs_first == base->ofs_last)
1034 free_base_data(base);
1035
1036 base->ofs_first++;
1037 return result;
1038 }
1039
1040 unlink_base_data(base);
1041 return NULL;
1042 }
1043
1044 static void find_unresolved_deltas(struct base_data *base)
1045 {
1046 struct base_data *new_base, *prev_base = NULL;
1047 for (;;) {
1048 new_base = find_unresolved_deltas_1(base, prev_base);
1049
1050 if (new_base) {
1051 prev_base = base;
1052 base = new_base;
1053 } else {
1054 free(base);
1055 base = prev_base;
1056 if (!base)
1057 return;
1058 prev_base = base->base;
1059 }
1060 }
1061 }
1062
1063 static int compare_ofs_delta_entry(const void *a, const void *b)
1064 {
1065 const struct ofs_delta_entry *delta_a = a;
1066 const struct ofs_delta_entry *delta_b = b;
1067
1068 return delta_a->offset < delta_b->offset ? -1 :
1069 delta_a->offset > delta_b->offset ? 1 :
1070 0;
1071 }
1072
1073 static int compare_ref_delta_entry(const void *a, const void *b)
1074 {
1075 const struct ref_delta_entry *delta_a = a;
1076 const struct ref_delta_entry *delta_b = b;
1077
1078 return hashcmp(delta_a->sha1, delta_b->sha1);
1079 }
1080
1081 static void resolve_base(struct object_entry *obj)
1082 {
1083 struct base_data *base_obj = alloc_base_data();
1084 base_obj->obj = obj;
1085 base_obj->data = NULL;
1086 find_unresolved_deltas(base_obj);
1087 }
1088
1089 #ifndef NO_PTHREADS
1090 static void *threaded_second_pass(void *data)
1091 {
1092 set_thread_data(data);
1093 for (;;) {
1094 int i;
1095 counter_lock();
1096 display_progress(progress, nr_resolved_deltas);
1097 counter_unlock();
1098 work_lock();
1099 while (nr_dispatched < nr_objects &&
1100 is_delta_type(objects[nr_dispatched].type))
1101 nr_dispatched++;
1102 if (nr_dispatched >= nr_objects) {
1103 work_unlock();
1104 break;
1105 }
1106 i = nr_dispatched++;
1107 work_unlock();
1108
1109 resolve_base(&objects[i]);
1110 }
1111 return NULL;
1112 }
1113 #endif
1114
1115 /*
1116 * First pass:
1117 * - find locations of all objects;
1118 * - calculate SHA1 of all non-delta objects;
1119 * - remember base (SHA1 or offset) for all deltas.
1120 */
1121 static void parse_pack_objects(unsigned char *sha1)
1122 {
1123 int i, nr_delays = 0;
1124 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1125 unsigned char ref_delta_sha1[20];
1126 struct stat st;
1127
1128 if (verbose)
1129 progress = start_progress(
1130 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1131 nr_objects);
1132 for (i = 0; i < nr_objects; i++) {
1133 struct object_entry *obj = &objects[i];
1134 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1135 ref_delta_sha1,
1136 obj->idx.oid.hash);
1137 obj->real_type = obj->type;
1138 if (obj->type == OBJ_OFS_DELTA) {
1139 nr_ofs_deltas++;
1140 ofs_delta->obj_no = i;
1141 ofs_delta++;
1142 } else if (obj->type == OBJ_REF_DELTA) {
1143 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1144 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_sha1);
1145 ref_deltas[nr_ref_deltas].obj_no = i;
1146 nr_ref_deltas++;
1147 } else if (!data) {
1148 /* large blobs, check later */
1149 obj->real_type = OBJ_BAD;
1150 nr_delays++;
1151 } else
1152 sha1_object(data, NULL, obj->size, obj->type,
1153 &obj->idx.oid);
1154 free(data);
1155 display_progress(progress, i+1);
1156 }
1157 objects[i].idx.offset = consumed_bytes;
1158 stop_progress(&progress);
1159
1160 /* Check pack integrity */
1161 flush();
1162 git_SHA1_Final(sha1, &input_ctx);
1163 if (hashcmp(fill(20), sha1))
1164 die(_("pack is corrupted (SHA1 mismatch)"));
1165 use(20);
1166
1167 /* If input_fd is a file, we should have reached its end now. */
1168 if (fstat(input_fd, &st))
1169 die_errno(_("cannot fstat packfile"));
1170 if (S_ISREG(st.st_mode) &&
1171 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1172 die(_("pack has junk at the end"));
1173
1174 for (i = 0; i < nr_objects; i++) {
1175 struct object_entry *obj = &objects[i];
1176 if (obj->real_type != OBJ_BAD)
1177 continue;
1178 obj->real_type = obj->type;
1179 sha1_object(NULL, obj, obj->size, obj->type,
1180 &obj->idx.oid);
1181 nr_delays--;
1182 }
1183 if (nr_delays)
1184 die(_("confusion beyond insanity in parse_pack_objects()"));
1185 }
1186
1187 /*
1188 * Second pass:
1189 * - for all non-delta objects, look if it is used as a base for
1190 * deltas;
1191 * - if used as a base, uncompress the object and apply all deltas,
1192 * recursively checking if the resulting object is used as a base
1193 * for some more deltas.
1194 */
1195 static void resolve_deltas(void)
1196 {
1197 int i;
1198
1199 if (!nr_ofs_deltas && !nr_ref_deltas)
1200 return;
1201
1202 /* Sort deltas by base SHA1/offset for fast searching */
1203 QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
1204 QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
1205
1206 if (verbose || show_resolving_progress)
1207 progress = start_progress(_("Resolving deltas"),
1208 nr_ref_deltas + nr_ofs_deltas);
1209
1210 #ifndef NO_PTHREADS
1211 nr_dispatched = 0;
1212 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1213 init_thread();
1214 for (i = 0; i < nr_threads; i++) {
1215 int ret = pthread_create(&thread_data[i].thread, NULL,
1216 threaded_second_pass, thread_data + i);
1217 if (ret)
1218 die(_("unable to create thread: %s"),
1219 strerror(ret));
1220 }
1221 for (i = 0; i < nr_threads; i++)
1222 pthread_join(thread_data[i].thread, NULL);
1223 cleanup_thread();
1224 return;
1225 }
1226 #endif
1227
1228 for (i = 0; i < nr_objects; i++) {
1229 struct object_entry *obj = &objects[i];
1230
1231 if (is_delta_type(obj->type))
1232 continue;
1233 resolve_base(obj);
1234 display_progress(progress, nr_resolved_deltas);
1235 }
1236 }
1237
1238 /*
1239 * Third pass:
1240 * - append objects to convert thin pack to full pack if required
1241 * - write the final 20-byte SHA-1
1242 */
1243 static void fix_unresolved_deltas(struct sha1file *f);
1244 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1245 {
1246 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1247 stop_progress(&progress);
1248 /* Flush remaining pack final 20-byte SHA1. */
1249 flush();
1250 return;
1251 }
1252
1253 if (fix_thin_pack) {
1254 struct sha1file *f;
1255 unsigned char read_sha1[20], tail_sha1[20];
1256 struct strbuf msg = STRBUF_INIT;
1257 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1258 int nr_objects_initial = nr_objects;
1259 if (nr_unresolved <= 0)
1260 die(_("confusion beyond insanity"));
1261 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1262 memset(objects + nr_objects + 1, 0,
1263 nr_unresolved * sizeof(*objects));
1264 f = sha1fd(output_fd, curr_pack);
1265 fix_unresolved_deltas(f);
1266 strbuf_addf(&msg, Q_("completed with %d local object",
1267 "completed with %d local objects",
1268 nr_objects - nr_objects_initial),
1269 nr_objects - nr_objects_initial);
1270 stop_progress_msg(&progress, msg.buf);
1271 strbuf_release(&msg);
1272 sha1close(f, tail_sha1, 0);
1273 hashcpy(read_sha1, pack_sha1);
1274 fixup_pack_header_footer(output_fd, pack_sha1,
1275 curr_pack, nr_objects,
1276 read_sha1, consumed_bytes-20);
1277 if (hashcmp(read_sha1, tail_sha1) != 0)
1278 die(_("Unexpected tail checksum for %s "
1279 "(disk corruption?)"), curr_pack);
1280 }
1281 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1282 die(Q_("pack has %d unresolved delta",
1283 "pack has %d unresolved deltas",
1284 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1285 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1286 }
1287
1288 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1289 {
1290 git_zstream stream;
1291 int status;
1292 unsigned char outbuf[4096];
1293
1294 git_deflate_init(&stream, zlib_compression_level);
1295 stream.next_in = in;
1296 stream.avail_in = size;
1297
1298 do {
1299 stream.next_out = outbuf;
1300 stream.avail_out = sizeof(outbuf);
1301 status = git_deflate(&stream, Z_FINISH);
1302 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1303 } while (status == Z_OK);
1304
1305 if (status != Z_STREAM_END)
1306 die(_("unable to deflate appended object (%d)"), status);
1307 size = stream.total_out;
1308 git_deflate_end(&stream);
1309 return size;
1310 }
1311
1312 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1313 const unsigned char *sha1, void *buf,
1314 unsigned long size, enum object_type type)
1315 {
1316 struct object_entry *obj = &objects[nr_objects++];
1317 unsigned char header[10];
1318 unsigned long s = size;
1319 int n = 0;
1320 unsigned char c = (type << 4) | (s & 15);
1321 s >>= 4;
1322 while (s) {
1323 header[n++] = c | 0x80;
1324 c = s & 0x7f;
1325 s >>= 7;
1326 }
1327 header[n++] = c;
1328 crc32_begin(f);
1329 sha1write(f, header, n);
1330 obj[0].size = size;
1331 obj[0].hdr_size = n;
1332 obj[0].type = type;
1333 obj[0].real_type = type;
1334 obj[1].idx.offset = obj[0].idx.offset + n;
1335 obj[1].idx.offset += write_compressed(f, buf, size);
1336 obj[0].idx.crc32 = crc32_end(f);
1337 sha1flush(f);
1338 hashcpy(obj->idx.oid.hash, sha1);
1339 return obj;
1340 }
1341
1342 static int delta_pos_compare(const void *_a, const void *_b)
1343 {
1344 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1345 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1346 return a->obj_no - b->obj_no;
1347 }
1348
1349 static void fix_unresolved_deltas(struct sha1file *f)
1350 {
1351 struct ref_delta_entry **sorted_by_pos;
1352 int i;
1353
1354 /*
1355 * Since many unresolved deltas may well be themselves base objects
1356 * for more unresolved deltas, we really want to include the
1357 * smallest number of base objects that would cover as much delta
1358 * as possible by picking the
1359 * trunc deltas first, allowing for other deltas to resolve without
1360 * additional base objects. Since most base objects are to be found
1361 * before deltas depending on them, a good heuristic is to start
1362 * resolving deltas in the same order as their position in the pack.
1363 */
1364 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1365 for (i = 0; i < nr_ref_deltas; i++)
1366 sorted_by_pos[i] = &ref_deltas[i];
1367 QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
1368
1369 for (i = 0; i < nr_ref_deltas; i++) {
1370 struct ref_delta_entry *d = sorted_by_pos[i];
1371 enum object_type type;
1372 struct base_data *base_obj = alloc_base_data();
1373
1374 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1375 continue;
1376 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1377 if (!base_obj->data)
1378 continue;
1379
1380 if (check_sha1_signature(d->sha1, base_obj->data,
1381 base_obj->size, typename(type)))
1382 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1383 base_obj->obj = append_obj_to_pack(f, d->sha1,
1384 base_obj->data, base_obj->size, type);
1385 find_unresolved_deltas(base_obj);
1386 display_progress(progress, nr_resolved_deltas);
1387 }
1388 free(sorted_by_pos);
1389 }
1390
1391 static void final(const char *final_pack_name, const char *curr_pack_name,
1392 const char *final_index_name, const char *curr_index_name,
1393 const char *keep_name, const char *keep_msg,
1394 unsigned char *sha1)
1395 {
1396 const char *report = "pack";
1397 struct strbuf pack_name = STRBUF_INIT;
1398 struct strbuf index_name = STRBUF_INIT;
1399 struct strbuf keep_name_buf = STRBUF_INIT;
1400 int err;
1401
1402 if (!from_stdin) {
1403 close(input_fd);
1404 } else {
1405 fsync_or_die(output_fd, curr_pack_name);
1406 err = close(output_fd);
1407 if (err)
1408 die_errno(_("error while closing pack file"));
1409 }
1410
1411 if (keep_msg) {
1412 int keep_fd, keep_msg_len = strlen(keep_msg);
1413
1414 if (!keep_name)
1415 keep_name = odb_pack_name(&keep_name_buf, sha1, "keep");
1416
1417 keep_fd = odb_pack_keep(keep_name);
1418 if (keep_fd < 0) {
1419 if (errno != EEXIST)
1420 die_errno(_("cannot write keep file '%s'"),
1421 keep_name);
1422 } else {
1423 if (keep_msg_len > 0) {
1424 write_or_die(keep_fd, keep_msg, keep_msg_len);
1425 write_or_die(keep_fd, "\n", 1);
1426 }
1427 if (close(keep_fd) != 0)
1428 die_errno(_("cannot close written keep file '%s'"),
1429 keep_name);
1430 report = "keep";
1431 }
1432 }
1433
1434 if (final_pack_name != curr_pack_name) {
1435 if (!final_pack_name)
1436 final_pack_name = odb_pack_name(&pack_name, sha1, "pack");
1437 if (finalize_object_file(curr_pack_name, final_pack_name))
1438 die(_("cannot store pack file"));
1439 } else if (from_stdin)
1440 chmod(final_pack_name, 0444);
1441
1442 if (final_index_name != curr_index_name) {
1443 if (!final_index_name)
1444 final_index_name = odb_pack_name(&index_name, sha1, "idx");
1445 if (finalize_object_file(curr_index_name, final_index_name))
1446 die(_("cannot store index file"));
1447 } else
1448 chmod(final_index_name, 0444);
1449
1450 if (!from_stdin) {
1451 printf("%s\n", sha1_to_hex(sha1));
1452 } else {
1453 struct strbuf buf = STRBUF_INIT;
1454
1455 strbuf_addf(&buf, "%s\t%s\n", report, sha1_to_hex(sha1));
1456 write_or_die(1, buf.buf, buf.len);
1457 strbuf_release(&buf);
1458
1459 /*
1460 * Let's just mimic git-unpack-objects here and write
1461 * the last part of the input buffer to stdout.
1462 */
1463 while (input_len) {
1464 err = xwrite(1, input_buffer + input_offset, input_len);
1465 if (err <= 0)
1466 break;
1467 input_len -= err;
1468 input_offset += err;
1469 }
1470 }
1471
1472 strbuf_release(&index_name);
1473 strbuf_release(&pack_name);
1474 strbuf_release(&keep_name_buf);
1475 }
1476
1477 static int git_index_pack_config(const char *k, const char *v, void *cb)
1478 {
1479 struct pack_idx_option *opts = cb;
1480
1481 if (!strcmp(k, "pack.indexversion")) {
1482 opts->version = git_config_int(k, v);
1483 if (opts->version > 2)
1484 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1485 return 0;
1486 }
1487 if (!strcmp(k, "pack.threads")) {
1488 nr_threads = git_config_int(k, v);
1489 if (nr_threads < 0)
1490 die(_("invalid number of threads specified (%d)"),
1491 nr_threads);
1492 #ifdef NO_PTHREADS
1493 if (nr_threads != 1)
1494 warning(_("no threads support, ignoring %s"), k);
1495 nr_threads = 1;
1496 #endif
1497 return 0;
1498 }
1499 return git_default_config(k, v, cb);
1500 }
1501
1502 static int cmp_uint32(const void *a_, const void *b_)
1503 {
1504 uint32_t a = *((uint32_t *)a_);
1505 uint32_t b = *((uint32_t *)b_);
1506
1507 return (a < b) ? -1 : (a != b);
1508 }
1509
1510 static void read_v2_anomalous_offsets(struct packed_git *p,
1511 struct pack_idx_option *opts)
1512 {
1513 const uint32_t *idx1, *idx2;
1514 uint32_t i;
1515
1516 /* The address of the 4-byte offset table */
1517 idx1 = (((const uint32_t *)p->index_data)
1518 + 2 /* 8-byte header */
1519 + 256 /* fan out */
1520 + 5 * p->num_objects /* 20-byte SHA-1 table */
1521 + p->num_objects /* CRC32 table */
1522 );
1523
1524 /* The address of the 8-byte offset table */
1525 idx2 = idx1 + p->num_objects;
1526
1527 for (i = 0; i < p->num_objects; i++) {
1528 uint32_t off = ntohl(idx1[i]);
1529 if (!(off & 0x80000000))
1530 continue;
1531 off = off & 0x7fffffff;
1532 check_pack_index_ptr(p, &idx2[off * 2]);
1533 if (idx2[off * 2])
1534 continue;
1535 /*
1536 * The real offset is ntohl(idx2[off * 2]) in high 4
1537 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1538 * octets. But idx2[off * 2] is Zero!!!
1539 */
1540 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1541 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1542 }
1543
1544 QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
1545 }
1546
1547 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1548 {
1549 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1550
1551 if (!p)
1552 die(_("Cannot open existing pack file '%s'"), pack_name);
1553 if (open_pack_index(p))
1554 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1555
1556 /* Read the attributes from the existing idx file */
1557 opts->version = p->index_version;
1558
1559 if (opts->version == 2)
1560 read_v2_anomalous_offsets(p, opts);
1561
1562 /*
1563 * Get rid of the idx file as we do not need it anymore.
1564 * NEEDSWORK: extract this bit from free_pack_by_name() in
1565 * sha1_file.c, perhaps? It shouldn't matter very much as we
1566 * know we haven't installed this pack (hence we never have
1567 * read anything from it).
1568 */
1569 close_pack_index(p);
1570 free(p);
1571 }
1572
1573 static void show_pack_info(int stat_only)
1574 {
1575 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1576 unsigned long *chain_histogram = NULL;
1577
1578 if (deepest_delta)
1579 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1580
1581 for (i = 0; i < nr_objects; i++) {
1582 struct object_entry *obj = &objects[i];
1583
1584 if (is_delta_type(obj->type))
1585 chain_histogram[obj_stat[i].delta_depth - 1]++;
1586 if (stat_only)
1587 continue;
1588 printf("%s %-6s %lu %lu %"PRIuMAX,
1589 oid_to_hex(&obj->idx.oid),
1590 typename(obj->real_type), obj->size,
1591 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1592 (uintmax_t)obj->idx.offset);
1593 if (is_delta_type(obj->type)) {
1594 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1595 printf(" %u %s", obj_stat[i].delta_depth,
1596 oid_to_hex(&bobj->idx.oid));
1597 }
1598 putchar('\n');
1599 }
1600
1601 if (baseobjects)
1602 printf_ln(Q_("non delta: %d object",
1603 "non delta: %d objects",
1604 baseobjects),
1605 baseobjects);
1606 for (i = 0; i < deepest_delta; i++) {
1607 if (!chain_histogram[i])
1608 continue;
1609 printf_ln(Q_("chain length = %d: %lu object",
1610 "chain length = %d: %lu objects",
1611 chain_histogram[i]),
1612 i + 1,
1613 chain_histogram[i]);
1614 }
1615 }
1616
1617 static const char *derive_filename(const char *pack_name, const char *suffix,
1618 struct strbuf *buf)
1619 {
1620 size_t len;
1621 if (!strip_suffix(pack_name, ".pack", &len))
1622 die(_("packfile name '%s' does not end with '.pack'"),
1623 pack_name);
1624 strbuf_add(buf, pack_name, len);
1625 strbuf_addstr(buf, suffix);
1626 return buf->buf;
1627 }
1628
1629 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1630 {
1631 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1632 const char *curr_index;
1633 const char *index_name = NULL, *pack_name = NULL;
1634 const char *keep_name = NULL, *keep_msg = NULL;
1635 struct strbuf index_name_buf = STRBUF_INIT,
1636 keep_name_buf = STRBUF_INIT;
1637 struct pack_idx_entry **idx_objects;
1638 struct pack_idx_option opts;
1639 unsigned char pack_sha1[20];
1640 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1641 int report_end_of_input = 0;
1642
1643 if (argc == 2 && !strcmp(argv[1], "-h"))
1644 usage(index_pack_usage);
1645
1646 check_replace_refs = 0;
1647 fsck_options.walk = mark_link;
1648
1649 reset_pack_idx_option(&opts);
1650 git_config(git_index_pack_config, &opts);
1651 if (prefix && chdir(prefix))
1652 die(_("Cannot come back to cwd"));
1653
1654 for (i = 1; i < argc; i++) {
1655 const char *arg = argv[i];
1656
1657 if (*arg == '-') {
1658 if (!strcmp(arg, "--stdin")) {
1659 from_stdin = 1;
1660 } else if (!strcmp(arg, "--fix-thin")) {
1661 fix_thin_pack = 1;
1662 } else if (!strcmp(arg, "--strict")) {
1663 strict = 1;
1664 do_fsck_object = 1;
1665 } else if (skip_prefix(arg, "--strict=", &arg)) {
1666 strict = 1;
1667 do_fsck_object = 1;
1668 fsck_set_msg_types(&fsck_options, arg);
1669 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1670 strict = 1;
1671 check_self_contained_and_connected = 1;
1672 } else if (!strcmp(arg, "--verify")) {
1673 verify = 1;
1674 } else if (!strcmp(arg, "--verify-stat")) {
1675 verify = 1;
1676 show_stat = 1;
1677 } else if (!strcmp(arg, "--verify-stat-only")) {
1678 verify = 1;
1679 show_stat = 1;
1680 stat_only = 1;
1681 } else if (!strcmp(arg, "--keep")) {
1682 keep_msg = "";
1683 } else if (starts_with(arg, "--keep=")) {
1684 keep_msg = arg + 7;
1685 } else if (starts_with(arg, "--threads=")) {
1686 char *end;
1687 nr_threads = strtoul(arg+10, &end, 0);
1688 if (!arg[10] || *end || nr_threads < 0)
1689 usage(index_pack_usage);
1690 #ifdef NO_PTHREADS
1691 if (nr_threads != 1)
1692 warning(_("no threads support, "
1693 "ignoring %s"), arg);
1694 nr_threads = 1;
1695 #endif
1696 } else if (starts_with(arg, "--pack_header=")) {
1697 struct pack_header *hdr;
1698 char *c;
1699
1700 hdr = (struct pack_header *)input_buffer;
1701 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1702 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1703 if (*c != ',')
1704 die(_("bad %s"), arg);
1705 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1706 if (*c)
1707 die(_("bad %s"), arg);
1708 input_len = sizeof(*hdr);
1709 } else if (!strcmp(arg, "-v")) {
1710 verbose = 1;
1711 } else if (!strcmp(arg, "--show-resolving-progress")) {
1712 show_resolving_progress = 1;
1713 } else if (!strcmp(arg, "--report-end-of-input")) {
1714 report_end_of_input = 1;
1715 } else if (!strcmp(arg, "-o")) {
1716 if (index_name || (i+1) >= argc)
1717 usage(index_pack_usage);
1718 index_name = argv[++i];
1719 } else if (starts_with(arg, "--index-version=")) {
1720 char *c;
1721 opts.version = strtoul(arg + 16, &c, 10);
1722 if (opts.version > 2)
1723 die(_("bad %s"), arg);
1724 if (*c == ',')
1725 opts.off32_limit = strtoul(c+1, &c, 0);
1726 if (*c || opts.off32_limit & 0x80000000)
1727 die(_("bad %s"), arg);
1728 } else if (skip_prefix(arg, "--max-input-size=", &arg)) {
1729 max_input_size = strtoumax(arg, NULL, 10);
1730 } else
1731 usage(index_pack_usage);
1732 continue;
1733 }
1734
1735 if (pack_name)
1736 usage(index_pack_usage);
1737 pack_name = arg;
1738 }
1739
1740 if (!pack_name && !from_stdin)
1741 usage(index_pack_usage);
1742 if (fix_thin_pack && !from_stdin)
1743 die(_("--fix-thin cannot be used without --stdin"));
1744 if (from_stdin && !startup_info->have_repository)
1745 die(_("--stdin requires a git repository"));
1746 if (!index_name && pack_name)
1747 index_name = derive_filename(pack_name, ".idx", &index_name_buf);
1748 if (keep_msg && !keep_name && pack_name)
1749 keep_name = derive_filename(pack_name, ".keep", &keep_name_buf);
1750
1751 if (verify) {
1752 if (!index_name)
1753 die(_("--verify with no packfile name given"));
1754 read_idx_option(&opts, index_name);
1755 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1756 }
1757 if (strict)
1758 opts.flags |= WRITE_IDX_STRICT;
1759
1760 #ifndef NO_PTHREADS
1761 if (!nr_threads) {
1762 nr_threads = online_cpus();
1763 /* An experiment showed that more threads does not mean faster */
1764 if (nr_threads > 3)
1765 nr_threads = 3;
1766 }
1767 #endif
1768
1769 curr_pack = open_pack_file(pack_name);
1770 parse_pack_header();
1771 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1772 if (show_stat)
1773 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1774 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1775 parse_pack_objects(pack_sha1);
1776 if (report_end_of_input)
1777 write_in_full(2, "\0", 1);
1778 resolve_deltas();
1779 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1780 free(ofs_deltas);
1781 free(ref_deltas);
1782 if (strict)
1783 foreign_nr = check_objects();
1784
1785 if (show_stat)
1786 show_pack_info(stat_only);
1787
1788 ALLOC_ARRAY(idx_objects, nr_objects);
1789 for (i = 0; i < nr_objects; i++)
1790 idx_objects[i] = &objects[i].idx;
1791 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1792 free(idx_objects);
1793
1794 if (!verify)
1795 final(pack_name, curr_pack,
1796 index_name, curr_index,
1797 keep_name, keep_msg,
1798 pack_sha1);
1799 else
1800 close(input_fd);
1801 free(objects);
1802 strbuf_release(&index_name_buf);
1803 strbuf_release(&keep_name_buf);
1804 if (pack_name == NULL)
1805 free((void *) curr_pack);
1806 if (index_name == NULL)
1807 free((void *) curr_index);
1808
1809 /*
1810 * Let the caller know this pack is not self contained
1811 */
1812 if (check_self_contained_and_connected && foreign_nr)
1813 return 1;
1814
1815 return 0;
1816 }
git for Debian