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packed-backend.c: rename a bunch of things and update comments
[git.git] / builtin / index-pack.c
blobf2be145e128d819da3adeaed0d0a05218fbe1411
1 #include "builtin.h"
2 #include "config.h"
3 #include "delta.h"
4 #include "pack.h"
5 #include "csum-file.h"
6 #include "blob.h"
7 #include "commit.h"
8 #include "tag.h"
9 #include "tree.h"
10 #include "progress.h"
11 #include "fsck.h"
12 #include "exec_cmd.h"
13 #include "streaming.h"
14 #include "thread-utils.h"
15 #include "packfile.h"
16
17 static const char index_pack_usage[] =
18 "git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
19
20 struct object_entry {
21 struct pack_idx_entry idx;
22 unsigned long size;
23 unsigned char hdr_size;
24 signed char type;
25 signed char real_type;
26 };
27
28 struct object_stat {
29 unsigned delta_depth;
30 int base_object_no;
31 };
32
33 struct base_data {
34 struct base_data *base;
35 struct base_data *child;
36 struct object_entry *obj;
37 void *data;
38 unsigned long size;
39 int ref_first, ref_last;
40 int ofs_first, ofs_last;
41 };
42
43 struct thread_local {
44 #ifndef NO_PTHREADS
45 pthread_t thread;
46 #endif
47 struct base_data *base_cache;
48 size_t base_cache_used;
49 int pack_fd;
50 };
51
52 #define FLAG_LINK (1u<<20)
53 #define FLAG_CHECKED (1u<<21)
54
55 struct ofs_delta_entry {
56 off_t offset;
57 int obj_no;
58 };
59
60 struct ref_delta_entry {
61 unsigned char sha1[20];
62 int obj_no;
63 };
64
65 static struct object_entry *objects;
66 static struct object_stat *obj_stat;
67 static struct ofs_delta_entry *ofs_deltas;
68 static struct ref_delta_entry *ref_deltas;
69 static struct thread_local nothread_data;
70 static int nr_objects;
71 static int nr_ofs_deltas;
72 static int nr_ref_deltas;
73 static int ref_deltas_alloc;
74 static int nr_resolved_deltas;
75 static int nr_threads;
76
77 static int from_stdin;
78 static int strict;
79 static int do_fsck_object;
80 static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
81 static int verbose;
82 static int show_resolving_progress;
83 static int show_stat;
84 static int check_self_contained_and_connected;
85
86 static struct progress *progress;
87
88 /* We always read in 4kB chunks. */
89 static unsigned char input_buffer[4096];
90 static unsigned int input_offset, input_len;
91 static off_t consumed_bytes;
92 static off_t max_input_size;
93 static unsigned deepest_delta;
94 static git_SHA_CTX input_ctx;
95 static uint32_t input_crc32;
96 static int input_fd, output_fd;
97 static const char *curr_pack;
98
99 #ifndef NO_PTHREADS
100
101 static struct thread_local *thread_data;
102 static int nr_dispatched;
103 static int threads_active;
104
105 static pthread_mutex_t read_mutex;
106 #define read_lock() lock_mutex(&read_mutex)
107 #define read_unlock() unlock_mutex(&read_mutex)
108
109 static pthread_mutex_t counter_mutex;
110 #define counter_lock() lock_mutex(&counter_mutex)
111 #define counter_unlock() unlock_mutex(&counter_mutex)
112
113 static pthread_mutex_t work_mutex;
114 #define work_lock() lock_mutex(&work_mutex)
115 #define work_unlock() unlock_mutex(&work_mutex)
116
117 static pthread_mutex_t deepest_delta_mutex;
118 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
119 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
120
121 static pthread_mutex_t type_cas_mutex;
122 #define type_cas_lock() lock_mutex(&type_cas_mutex)
123 #define type_cas_unlock() unlock_mutex(&type_cas_mutex)
124
125 static pthread_key_t key;
126
127 static inline void lock_mutex(pthread_mutex_t *mutex)
128 {
129 if (threads_active)
130 pthread_mutex_lock(mutex);
131 }
132
133 static inline void unlock_mutex(pthread_mutex_t *mutex)
134 {
135 if (threads_active)
136 pthread_mutex_unlock(mutex);
137 }
138
139 /*
140 * Mutex and conditional variable can't be statically-initialized on Windows.
141 */
142 static void init_thread(void)
143 {
144 int i;
145 init_recursive_mutex(&read_mutex);
146 pthread_mutex_init(&counter_mutex, NULL);
147 pthread_mutex_init(&work_mutex, NULL);
148 pthread_mutex_init(&type_cas_mutex, NULL);
149 if (show_stat)
150 pthread_mutex_init(&deepest_delta_mutex, NULL);
151 pthread_key_create(&key, NULL);
152 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
153 for (i = 0; i < nr_threads; i++) {
154 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
155 if (thread_data[i].pack_fd == -1)
156 die_errno(_("unable to open %s"), curr_pack);
157 }
158
159 threads_active = 1;
160 }
161
162 static void cleanup_thread(void)
163 {
164 int i;
165 if (!threads_active)
166 return;
167 threads_active = 0;
168 pthread_mutex_destroy(&read_mutex);
169 pthread_mutex_destroy(&counter_mutex);
170 pthread_mutex_destroy(&work_mutex);
171 pthread_mutex_destroy(&type_cas_mutex);
172 if (show_stat)
173 pthread_mutex_destroy(&deepest_delta_mutex);
174 for (i = 0; i < nr_threads; i++)
175 close(thread_data[i].pack_fd);
176 pthread_key_delete(key);
177 free(thread_data);
178 }
179
180 #else
181
182 #define read_lock()
183 #define read_unlock()
184
185 #define counter_lock()
186 #define counter_unlock()
187
188 #define work_lock()
189 #define work_unlock()
190
191 #define deepest_delta_lock()
192 #define deepest_delta_unlock()
193
194 #define type_cas_lock()
195 #define type_cas_unlock()
196
197 #endif
198
199
200 static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
201 {
202 if (!obj)
203 return -1;
204
205 if (type != OBJ_ANY && obj->type != type)
206 die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
207
208 obj->flags |= FLAG_LINK;
209 return 0;
210 }
211
212 /* The content of each linked object must have been checked
213 or it must be already present in the object database */
214 static unsigned check_object(struct object *obj)
215 {
216 if (!obj)
217 return 0;
218
219 if (!(obj->flags & FLAG_LINK))
220 return 0;
221
222 if (!(obj->flags & FLAG_CHECKED)) {
223 unsigned long size;
224 int type = sha1_object_info(obj->oid.hash, &size);
225 if (type <= 0)
226 die(_("did not receive expected object %s"),
227 oid_to_hex(&obj->oid));
228 if (type != obj->type)
229 die(_("object %s: expected type %s, found %s"),
230 oid_to_hex(&obj->oid),
231 typename(obj->type), typename(type));
232 obj->flags |= FLAG_CHECKED;
233 return 1;
234 }
235
236 return 0;
237 }
238
239 static unsigned check_objects(void)
240 {
241 unsigned i, max, foreign_nr = 0;
242
243 max = get_max_object_index();
244 for (i = 0; i < max; i++)
245 foreign_nr += check_object(get_indexed_object(i));
246 return foreign_nr;
247 }
248
249
250 /* Discard current buffer used content. */
251 static void flush(void)
252 {
253 if (input_offset) {
254 if (output_fd >= 0)
255 write_or_die(output_fd, input_buffer, input_offset);
256 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
257 memmove(input_buffer, input_buffer + input_offset, input_len);
258 input_offset = 0;
259 }
260 }
261
262 /*
263 * Make sure at least "min" bytes are available in the buffer, and
264 * return the pointer to the buffer.
265 */
266 static void *fill(int min)
267 {
268 if (min <= input_len)
269 return input_buffer + input_offset;
270 if (min > sizeof(input_buffer))
271 die(Q_("cannot fill %d byte",
272 "cannot fill %d bytes",
273 min),
274 min);
275 flush();
276 do {
277 ssize_t ret = xread(input_fd, input_buffer + input_len,
278 sizeof(input_buffer) - input_len);
279 if (ret <= 0) {
280 if (!ret)
281 die(_("early EOF"));
282 die_errno(_("read error on input"));
283 }
284 input_len += ret;
285 if (from_stdin)
286 display_throughput(progress, consumed_bytes + input_len);
287 } while (input_len < min);
288 return input_buffer;
289 }
290
291 static void use(int bytes)
292 {
293 if (bytes > input_len)
294 die(_("used more bytes than were available"));
295 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
296 input_len -= bytes;
297 input_offset += bytes;
298
299 /* make sure off_t is sufficiently large not to wrap */
300 if (signed_add_overflows(consumed_bytes, bytes))
301 die(_("pack too large for current definition of off_t"));
302 consumed_bytes += bytes;
303 if (max_input_size && consumed_bytes > max_input_size)
304 die(_("pack exceeds maximum allowed size"));
305 }
306
307 static const char *open_pack_file(const char *pack_name)
308 {
309 if (from_stdin) {
310 input_fd = 0;
311 if (!pack_name) {
312 struct strbuf tmp_file = STRBUF_INIT;
313 output_fd = odb_mkstemp(&tmp_file,
314 "pack/tmp_pack_XXXXXX");
315 pack_name = strbuf_detach(&tmp_file, NULL);
316 } else {
317 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
318 if (output_fd < 0)
319 die_errno(_("unable to create '%s'"), pack_name);
320 }
321 nothread_data.pack_fd = output_fd;
322 } else {
323 input_fd = open(pack_name, O_RDONLY);
324 if (input_fd < 0)
325 die_errno(_("cannot open packfile '%s'"), pack_name);
326 output_fd = -1;
327 nothread_data.pack_fd = input_fd;
328 }
329 git_SHA1_Init(&input_ctx);
330 return pack_name;
331 }
332
333 static void parse_pack_header(void)
334 {
335 struct pack_header *hdr = fill(sizeof(struct pack_header));
336
337 /* Header consistency check */
338 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
339 die(_("pack signature mismatch"));
340 if (!pack_version_ok(hdr->hdr_version))
341 die(_("pack version %"PRIu32" unsupported"),
342 ntohl(hdr->hdr_version));
343
344 nr_objects = ntohl(hdr->hdr_entries);
345 use(sizeof(struct pack_header));
346 }
347
348 static NORETURN void bad_object(off_t offset, const char *format,
349 ...) __attribute__((format (printf, 2, 3)));
350
351 static NORETURN void bad_object(off_t offset, const char *format, ...)
352 {
353 va_list params;
354 char buf[1024];
355
356 va_start(params, format);
357 vsnprintf(buf, sizeof(buf), format, params);
358 va_end(params);
359 die(_("pack has bad object at offset %"PRIuMAX": %s"),
360 (uintmax_t)offset, buf);
361 }
362
363 static inline struct thread_local *get_thread_data(void)
364 {
365 #ifndef NO_PTHREADS
366 if (threads_active)
367 return pthread_getspecific(key);
368 assert(!threads_active &&
369 "This should only be reached when all threads are gone");
370 #endif
371 return &nothread_data;
372 }
373
374 #ifndef NO_PTHREADS
375 static void set_thread_data(struct thread_local *data)
376 {
377 if (threads_active)
378 pthread_setspecific(key, data);
379 }
380 #endif
381
382 static struct base_data *alloc_base_data(void)
383 {
384 struct base_data *base = xcalloc(1, sizeof(struct base_data));
385 base->ref_last = -1;
386 base->ofs_last = -1;
387 return base;
388 }
389
390 static void free_base_data(struct base_data *c)
391 {
392 if (c->data) {
393 FREE_AND_NULL(c->data);
394 get_thread_data()->base_cache_used -= c->size;
395 }
396 }
397
398 static void prune_base_data(struct base_data *retain)
399 {
400 struct base_data *b;
401 struct thread_local *data = get_thread_data();
402 for (b = data->base_cache;
403 data->base_cache_used > delta_base_cache_limit && b;
404 b = b->child) {
405 if (b->data && b != retain)
406 free_base_data(b);
407 }
408 }
409
410 static void link_base_data(struct base_data *base, struct base_data *c)
411 {
412 if (base)
413 base->child = c;
414 else
415 get_thread_data()->base_cache = c;
416
417 c->base = base;
418 c->child = NULL;
419 if (c->data)
420 get_thread_data()->base_cache_used += c->size;
421 prune_base_data(c);
422 }
423
424 static void unlink_base_data(struct base_data *c)
425 {
426 struct base_data *base = c->base;
427 if (base)
428 base->child = NULL;
429 else
430 get_thread_data()->base_cache = NULL;
431 free_base_data(c);
432 }
433
434 static int is_delta_type(enum object_type type)
435 {
436 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
437 }
438
439 static void *unpack_entry_data(off_t offset, unsigned long size,
440 enum object_type type, unsigned char *sha1)
441 {
442 static char fixed_buf[8192];
443 int status;
444 git_zstream stream;
445 void *buf;
446 git_SHA_CTX c;
447 char hdr[32];
448 int hdrlen;
449
450 if (!is_delta_type(type)) {
451 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), size) + 1;
452 git_SHA1_Init(&c);
453 git_SHA1_Update(&c, hdr, hdrlen);
454 } else
455 sha1 = NULL;
456 if (type == OBJ_BLOB && size > big_file_threshold)
457 buf = fixed_buf;
458 else
459 buf = xmallocz(size);
460
461 memset(&stream, 0, sizeof(stream));
462 git_inflate_init(&stream);
463 stream.next_out = buf;
464 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
465
466 do {
467 unsigned char *last_out = stream.next_out;
468 stream.next_in = fill(1);
469 stream.avail_in = input_len;
470 status = git_inflate(&stream, 0);
471 use(input_len - stream.avail_in);
472 if (sha1)
473 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
474 if (buf == fixed_buf) {
475 stream.next_out = buf;
476 stream.avail_out = sizeof(fixed_buf);
477 }
478 } while (status == Z_OK);
479 if (stream.total_out != size || status != Z_STREAM_END)
480 bad_object(offset, _("inflate returned %d"), status);
481 git_inflate_end(&stream);
482 if (sha1)
483 git_SHA1_Final(sha1, &c);
484 return buf == fixed_buf ? NULL : buf;
485 }
486
487 static void *unpack_raw_entry(struct object_entry *obj,
488 off_t *ofs_offset,
489 unsigned char *ref_sha1,
490 unsigned char *sha1)
491 {
492 unsigned char *p;
493 unsigned long size, c;
494 off_t base_offset;
495 unsigned shift;
496 void *data;
497
498 obj->idx.offset = consumed_bytes;
499 input_crc32 = crc32(0, NULL, 0);
500
501 p = fill(1);
502 c = *p;
503 use(1);
504 obj->type = (c >> 4) & 7;
505 size = (c & 15);
506 shift = 4;
507 while (c & 0x80) {
508 p = fill(1);
509 c = *p;
510 use(1);
511 size += (c & 0x7f) << shift;
512 shift += 7;
513 }
514 obj->size = size;
515
516 switch (obj->type) {
517 case OBJ_REF_DELTA:
518 hashcpy(ref_sha1, fill(20));
519 use(20);
520 break;
521 case OBJ_OFS_DELTA:
522 p = fill(1);
523 c = *p;
524 use(1);
525 base_offset = c & 127;
526 while (c & 128) {
527 base_offset += 1;
528 if (!base_offset || MSB(base_offset, 7))
529 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
530 p = fill(1);
531 c = *p;
532 use(1);
533 base_offset = (base_offset << 7) + (c & 127);
534 }
535 *ofs_offset = obj->idx.offset - base_offset;
536 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
537 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
538 break;
539 case OBJ_COMMIT:
540 case OBJ_TREE:
541 case OBJ_BLOB:
542 case OBJ_TAG:
543 break;
544 default:
545 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
546 }
547 obj->hdr_size = consumed_bytes - obj->idx.offset;
548
549 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
550 obj->idx.crc32 = input_crc32;
551 return data;
552 }
553
554 static void *unpack_data(struct object_entry *obj,
555 int (*consume)(const unsigned char *, unsigned long, void *),
556 void *cb_data)
557 {
558 off_t from = obj[0].idx.offset + obj[0].hdr_size;
559 off_t len = obj[1].idx.offset - from;
560 unsigned char *data, *inbuf;
561 git_zstream stream;
562 int status;
563
564 data = xmallocz(consume ? 64*1024 : obj->size);
565 inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
566
567 memset(&stream, 0, sizeof(stream));
568 git_inflate_init(&stream);
569 stream.next_out = data;
570 stream.avail_out = consume ? 64*1024 : obj->size;
571
572 do {
573 ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
574 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
575 if (n < 0)
576 die_errno(_("cannot pread pack file"));
577 if (!n)
578 die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
579 "premature end of pack file, %"PRIuMAX" bytes missing",
580 (unsigned int)len),
581 (uintmax_t)len);
582 from += n;
583 len -= n;
584 stream.next_in = inbuf;
585 stream.avail_in = n;
586 if (!consume)
587 status = git_inflate(&stream, 0);
588 else {
589 do {
590 status = git_inflate(&stream, 0);
591 if (consume(data, stream.next_out - data, cb_data)) {
592 free(inbuf);
593 free(data);
594 return NULL;
595 }
596 stream.next_out = data;
597 stream.avail_out = 64*1024;
598 } while (status == Z_OK && stream.avail_in);
599 }
600 } while (len && status == Z_OK && !stream.avail_in);
601
602 /* This has been inflated OK when first encountered, so... */
603 if (status != Z_STREAM_END || stream.total_out != obj->size)
604 die(_("serious inflate inconsistency"));
605
606 git_inflate_end(&stream);
607 free(inbuf);
608 if (consume) {
609 FREE_AND_NULL(data);
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 =
798 has_sha1_file_with_flags(oid->hash, OBJECT_INFO_QUICK);
799 read_unlock();
800 }
801
802 if (collision_test_needed && !data) {
803 read_lock();
804 if (!check_collison(obj_entry))
805 collision_test_needed = 0;
806 read_unlock();
807 }
808 if (collision_test_needed) {
809 void *has_data;
810 enum object_type has_type;
811 unsigned long has_size;
812 read_lock();
813 has_type = sha1_object_info(oid->hash, &has_size);
814 if (has_type < 0)
815 die(_("cannot read existing object info %s"), oid_to_hex(oid));
816 if (has_type != type || has_size != size)
817 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
818 has_data = read_sha1_file(oid->hash, &has_type, &has_size);
819 read_unlock();
820 if (!data)
821 data = new_data = get_data_from_pack(obj_entry);
822 if (!has_data)
823 die(_("cannot read existing object %s"), oid_to_hex(oid));
824 if (size != has_size || type != has_type ||
825 memcmp(data, has_data, size) != 0)
826 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
827 free(has_data);
828 }
829
830 if (strict) {
831 read_lock();
832 if (type == OBJ_BLOB) {
833 struct blob *blob = lookup_blob(oid);
834 if (blob)
835 blob->object.flags |= FLAG_CHECKED;
836 else
837 die(_("invalid blob object %s"), oid_to_hex(oid));
838 } else {
839 struct object *obj;
840 int eaten;
841 void *buf = (void *) data;
842
843 assert(data && "data can only be NULL for large _blobs_");
844
845 /*
846 * we do not need to free the memory here, as the
847 * buf is deleted by the caller.
848 */
849 obj = parse_object_buffer(oid, type, size, buf,
850 &eaten);
851 if (!obj)
852 die(_("invalid %s"), typename(type));
853 if (do_fsck_object &&
854 fsck_object(obj, buf, size, &fsck_options))
855 die(_("Error in object"));
856 if (fsck_walk(obj, NULL, &fsck_options))
857 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
858
859 if (obj->type == OBJ_TREE) {
860 struct tree *item = (struct tree *) obj;
861 item->buffer = NULL;
862 obj->parsed = 0;
863 }
864 if (obj->type == OBJ_COMMIT) {
865 struct commit *commit = (struct commit *) obj;
866 if (detach_commit_buffer(commit, NULL) != data)
867 die("BUG: parse_object_buffer transmogrified our buffer");
868 }
869 obj->flags |= FLAG_CHECKED;
870 }
871 read_unlock();
872 }
873
874 free(new_data);
875 }
876
877 /*
878 * This function is part of find_unresolved_deltas(). There are two
879 * walkers going in the opposite ways.
880 *
881 * The first one in find_unresolved_deltas() traverses down from
882 * parent node to children, deflating nodes along the way. However,
883 * memory for deflated nodes is limited by delta_base_cache_limit, so
884 * at some point parent node's deflated content may be freed.
885 *
886 * The second walker is this function, which goes from current node up
887 * to top parent if necessary to deflate the node. In normal
888 * situation, its parent node would be already deflated, so it just
889 * needs to apply delta.
890 *
891 * In the worst case scenario, parent node is no longer deflated because
892 * we're running out of delta_base_cache_limit; we need to re-deflate
893 * parents, possibly up to the top base.
894 *
895 * All deflated objects here are subject to be freed if we exceed
896 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
897 * just need to make sure the last node is not freed.
898 */
899 static void *get_base_data(struct base_data *c)
900 {
901 if (!c->data) {
902 struct object_entry *obj = c->obj;
903 struct base_data **delta = NULL;
904 int delta_nr = 0, delta_alloc = 0;
905
906 while (is_delta_type(c->obj->type) && !c->data) {
907 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
908 delta[delta_nr++] = c;
909 c = c->base;
910 }
911 if (!delta_nr) {
912 c->data = get_data_from_pack(obj);
913 c->size = obj->size;
914 get_thread_data()->base_cache_used += c->size;
915 prune_base_data(c);
916 }
917 for (; delta_nr > 0; delta_nr--) {
918 void *base, *raw;
919 c = delta[delta_nr - 1];
920 obj = c->obj;
921 base = get_base_data(c->base);
922 raw = get_data_from_pack(obj);
923 c->data = patch_delta(
924 base, c->base->size,
925 raw, obj->size,
926 &c->size);
927 free(raw);
928 if (!c->data)
929 bad_object(obj->idx.offset, _("failed to apply delta"));
930 get_thread_data()->base_cache_used += c->size;
931 prune_base_data(c);
932 }
933 free(delta);
934 }
935 return c->data;
936 }
937
938 static void resolve_delta(struct object_entry *delta_obj,
939 struct base_data *base, struct base_data *result)
940 {
941 void *base_data, *delta_data;
942
943 if (show_stat) {
944 int i = delta_obj - objects;
945 int j = base->obj - objects;
946 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
947 deepest_delta_lock();
948 if (deepest_delta < obj_stat[i].delta_depth)
949 deepest_delta = obj_stat[i].delta_depth;
950 deepest_delta_unlock();
951 obj_stat[i].base_object_no = j;
952 }
953 delta_data = get_data_from_pack(delta_obj);
954 base_data = get_base_data(base);
955 result->obj = delta_obj;
956 result->data = patch_delta(base_data, base->size,
957 delta_data, delta_obj->size, &result->size);
958 free(delta_data);
959 if (!result->data)
960 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
961 hash_sha1_file(result->data, result->size,
962 typename(delta_obj->real_type),
963 delta_obj->idx.oid.hash);
964 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
965 &delta_obj->idx.oid);
966 counter_lock();
967 nr_resolved_deltas++;
968 counter_unlock();
969 }
970
971 /*
972 * Standard boolean compare-and-swap: atomically check whether "*type" is
973 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
974 * and return false.
975 */
976 static int compare_and_swap_type(signed char *type,
977 enum object_type want,
978 enum object_type set)
979 {
980 enum object_type old;
981
982 type_cas_lock();
983 old = *type;
984 if (old == want)
985 *type = set;
986 type_cas_unlock();
987
988 return old == want;
989 }
990
991 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
992 struct base_data *prev_base)
993 {
994 if (base->ref_last == -1 && base->ofs_last == -1) {
995 find_ref_delta_children(base->obj->idx.oid.hash,
996 &base->ref_first, &base->ref_last,
997 OBJ_REF_DELTA);
998
999 find_ofs_delta_children(base->obj->idx.offset,
1000 &base->ofs_first, &base->ofs_last,
1001 OBJ_OFS_DELTA);
1002
1003 if (base->ref_last == -1 && base->ofs_last == -1) {
1004 free(base->data);
1005 return NULL;
1006 }
1007
1008 link_base_data(prev_base, base);
1009 }
1010
1011 if (base->ref_first <= base->ref_last) {
1012 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1013 struct base_data *result = alloc_base_data();
1014
1015 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1016 base->obj->real_type))
1017 die("BUG: child->real_type != OBJ_REF_DELTA");
1018
1019 resolve_delta(child, base, result);
1020 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1021 free_base_data(base);
1022
1023 base->ref_first++;
1024 return result;
1025 }
1026
1027 if (base->ofs_first <= base->ofs_last) {
1028 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1029 struct base_data *result = alloc_base_data();
1030
1031 assert(child->real_type == OBJ_OFS_DELTA);
1032 child->real_type = base->obj->real_type;
1033 resolve_delta(child, base, result);
1034 if (base->ofs_first == base->ofs_last)
1035 free_base_data(base);
1036
1037 base->ofs_first++;
1038 return result;
1039 }
1040
1041 unlink_base_data(base);
1042 return NULL;
1043 }
1044
1045 static void find_unresolved_deltas(struct base_data *base)
1046 {
1047 struct base_data *new_base, *prev_base = NULL;
1048 for (;;) {
1049 new_base = find_unresolved_deltas_1(base, prev_base);
1050
1051 if (new_base) {
1052 prev_base = base;
1053 base = new_base;
1054 } else {
1055 free(base);
1056 base = prev_base;
1057 if (!base)
1058 return;
1059 prev_base = base->base;
1060 }
1061 }
1062 }
1063
1064 static int compare_ofs_delta_entry(const void *a, const void *b)
1065 {
1066 const struct ofs_delta_entry *delta_a = a;
1067 const struct ofs_delta_entry *delta_b = b;
1068
1069 return delta_a->offset < delta_b->offset ? -1 :
1070 delta_a->offset > delta_b->offset ? 1 :
1071 0;
1072 }
1073
1074 static int compare_ref_delta_entry(const void *a, const void *b)
1075 {
1076 const struct ref_delta_entry *delta_a = a;
1077 const struct ref_delta_entry *delta_b = b;
1078
1079 return hashcmp(delta_a->sha1, delta_b->sha1);
1080 }
1081
1082 static void resolve_base(struct object_entry *obj)
1083 {
1084 struct base_data *base_obj = alloc_base_data();
1085 base_obj->obj = obj;
1086 base_obj->data = NULL;
1087 find_unresolved_deltas(base_obj);
1088 }
1089
1090 #ifndef NO_PTHREADS
1091 static void *threaded_second_pass(void *data)
1092 {
1093 set_thread_data(data);
1094 for (;;) {
1095 int i;
1096 counter_lock();
1097 display_progress(progress, nr_resolved_deltas);
1098 counter_unlock();
1099 work_lock();
1100 while (nr_dispatched < nr_objects &&
1101 is_delta_type(objects[nr_dispatched].type))
1102 nr_dispatched++;
1103 if (nr_dispatched >= nr_objects) {
1104 work_unlock();
1105 break;
1106 }
1107 i = nr_dispatched++;
1108 work_unlock();
1109
1110 resolve_base(&objects[i]);
1111 }
1112 return NULL;
1113 }
1114 #endif
1115
1116 /*
1117 * First pass:
1118 * - find locations of all objects;
1119 * - calculate SHA1 of all non-delta objects;
1120 * - remember base (SHA1 or offset) for all deltas.
1121 */
1122 static void parse_pack_objects(unsigned char *sha1)
1123 {
1124 int i, nr_delays = 0;
1125 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1126 unsigned char ref_delta_sha1[20];
1127 struct stat st;
1128
1129 if (verbose)
1130 progress = start_progress(
1131 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1132 nr_objects);
1133 for (i = 0; i < nr_objects; i++) {
1134 struct object_entry *obj = &objects[i];
1135 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1136 ref_delta_sha1,
1137 obj->idx.oid.hash);
1138 obj->real_type = obj->type;
1139 if (obj->type == OBJ_OFS_DELTA) {
1140 nr_ofs_deltas++;
1141 ofs_delta->obj_no = i;
1142 ofs_delta++;
1143 } else if (obj->type == OBJ_REF_DELTA) {
1144 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1145 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_sha1);
1146 ref_deltas[nr_ref_deltas].obj_no = i;
1147 nr_ref_deltas++;
1148 } else if (!data) {
1149 /* large blobs, check later */
1150 obj->real_type = OBJ_BAD;
1151 nr_delays++;
1152 } else
1153 sha1_object(data, NULL, obj->size, obj->type,
1154 &obj->idx.oid);
1155 free(data);
1156 display_progress(progress, i+1);
1157 }
1158 objects[i].idx.offset = consumed_bytes;
1159 stop_progress(&progress);
1160
1161 /* Check pack integrity */
1162 flush();
1163 git_SHA1_Final(sha1, &input_ctx);
1164 if (hashcmp(fill(20), sha1))
1165 die(_("pack is corrupted (SHA1 mismatch)"));
1166 use(20);
1167
1168 /* If input_fd is a file, we should have reached its end now. */
1169 if (fstat(input_fd, &st))
1170 die_errno(_("cannot fstat packfile"));
1171 if (S_ISREG(st.st_mode) &&
1172 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1173 die(_("pack has junk at the end"));
1174
1175 for (i = 0; i < nr_objects; i++) {
1176 struct object_entry *obj = &objects[i];
1177 if (obj->real_type != OBJ_BAD)
1178 continue;
1179 obj->real_type = obj->type;
1180 sha1_object(NULL, obj, obj->size, obj->type,
1181 &obj->idx.oid);
1182 nr_delays--;
1183 }
1184 if (nr_delays)
1185 die(_("confusion beyond insanity in parse_pack_objects()"));
1186 }
1187
1188 /*
1189 * Second pass:
1190 * - for all non-delta objects, look if it is used as a base for
1191 * deltas;
1192 * - if used as a base, uncompress the object and apply all deltas,
1193 * recursively checking if the resulting object is used as a base
1194 * for some more deltas.
1195 */
1196 static void resolve_deltas(void)
1197 {
1198 int i;
1199
1200 if (!nr_ofs_deltas && !nr_ref_deltas)
1201 return;
1202
1203 /* Sort deltas by base SHA1/offset for fast searching */
1204 QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
1205 QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
1206
1207 if (verbose || show_resolving_progress)
1208 progress = start_progress(_("Resolving deltas"),
1209 nr_ref_deltas + nr_ofs_deltas);
1210
1211 #ifndef NO_PTHREADS
1212 nr_dispatched = 0;
1213 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1214 init_thread();
1215 for (i = 0; i < nr_threads; i++) {
1216 int ret = pthread_create(&thread_data[i].thread, NULL,
1217 threaded_second_pass, thread_data + i);
1218 if (ret)
1219 die(_("unable to create thread: %s"),
1220 strerror(ret));
1221 }
1222 for (i = 0; i < nr_threads; i++)
1223 pthread_join(thread_data[i].thread, NULL);
1224 cleanup_thread();
1225 return;
1226 }
1227 #endif
1228
1229 for (i = 0; i < nr_objects; i++) {
1230 struct object_entry *obj = &objects[i];
1231
1232 if (is_delta_type(obj->type))
1233 continue;
1234 resolve_base(obj);
1235 display_progress(progress, nr_resolved_deltas);
1236 }
1237 }
1238
1239 /*
1240 * Third pass:
1241 * - append objects to convert thin pack to full pack if required
1242 * - write the final 20-byte SHA-1
1243 */
1244 static void fix_unresolved_deltas(struct sha1file *f);
1245 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1246 {
1247 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1248 stop_progress(&progress);
1249 /* Flush remaining pack final 20-byte SHA1. */
1250 flush();
1251 return;
1252 }
1253
1254 if (fix_thin_pack) {
1255 struct sha1file *f;
1256 unsigned char read_sha1[20], tail_sha1[20];
1257 struct strbuf msg = STRBUF_INIT;
1258 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1259 int nr_objects_initial = nr_objects;
1260 if (nr_unresolved <= 0)
1261 die(_("confusion beyond insanity"));
1262 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1263 memset(objects + nr_objects + 1, 0,
1264 nr_unresolved * sizeof(*objects));
1265 f = sha1fd(output_fd, curr_pack);
1266 fix_unresolved_deltas(f);
1267 strbuf_addf(&msg, Q_("completed with %d local object",
1268 "completed with %d local objects",
1269 nr_objects - nr_objects_initial),
1270 nr_objects - nr_objects_initial);
1271 stop_progress_msg(&progress, msg.buf);
1272 strbuf_release(&msg);
1273 sha1close(f, tail_sha1, 0);
1274 hashcpy(read_sha1, pack_sha1);
1275 fixup_pack_header_footer(output_fd, pack_sha1,
1276 curr_pack, nr_objects,
1277 read_sha1, consumed_bytes-20);
1278 if (hashcmp(read_sha1, tail_sha1) != 0)
1279 die(_("Unexpected tail checksum for %s "
1280 "(disk corruption?)"), curr_pack);
1281 }
1282 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1283 die(Q_("pack has %d unresolved delta",
1284 "pack has %d unresolved deltas",
1285 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1286 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1287 }
1288
1289 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1290 {
1291 git_zstream stream;
1292 int status;
1293 unsigned char outbuf[4096];
1294
1295 git_deflate_init(&stream, zlib_compression_level);
1296 stream.next_in = in;
1297 stream.avail_in = size;
1298
1299 do {
1300 stream.next_out = outbuf;
1301 stream.avail_out = sizeof(outbuf);
1302 status = git_deflate(&stream, Z_FINISH);
1303 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1304 } while (status == Z_OK);
1305
1306 if (status != Z_STREAM_END)
1307 die(_("unable to deflate appended object (%d)"), status);
1308 size = stream.total_out;
1309 git_deflate_end(&stream);
1310 return size;
1311 }
1312
1313 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1314 const unsigned char *sha1, void *buf,
1315 unsigned long size, enum object_type type)
1316 {
1317 struct object_entry *obj = &objects[nr_objects++];
1318 unsigned char header[10];
1319 unsigned long s = size;
1320 int n = 0;
1321 unsigned char c = (type << 4) | (s & 15);
1322 s >>= 4;
1323 while (s) {
1324 header[n++] = c | 0x80;
1325 c = s & 0x7f;
1326 s >>= 7;
1327 }
1328 header[n++] = c;
1329 crc32_begin(f);
1330 sha1write(f, header, n);
1331 obj[0].size = size;
1332 obj[0].hdr_size = n;
1333 obj[0].type = type;
1334 obj[0].real_type = type;
1335 obj[1].idx.offset = obj[0].idx.offset + n;
1336 obj[1].idx.offset += write_compressed(f, buf, size);
1337 obj[0].idx.crc32 = crc32_end(f);
1338 sha1flush(f);
1339 hashcpy(obj->idx.oid.hash, sha1);
1340 return obj;
1341 }
1342
1343 static int delta_pos_compare(const void *_a, const void *_b)
1344 {
1345 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1346 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1347 return a->obj_no - b->obj_no;
1348 }
1349
1350 static void fix_unresolved_deltas(struct sha1file *f)
1351 {
1352 struct ref_delta_entry **sorted_by_pos;
1353 int i;
1354
1355 /*
1356 * Since many unresolved deltas may well be themselves base objects
1357 * for more unresolved deltas, we really want to include the
1358 * smallest number of base objects that would cover as much delta
1359 * as possible by picking the
1360 * trunc deltas first, allowing for other deltas to resolve without
1361 * additional base objects. Since most base objects are to be found
1362 * before deltas depending on them, a good heuristic is to start
1363 * resolving deltas in the same order as their position in the pack.
1364 */
1365 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1366 for (i = 0; i < nr_ref_deltas; i++)
1367 sorted_by_pos[i] = &ref_deltas[i];
1368 QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
1369
1370 for (i = 0; i < nr_ref_deltas; i++) {
1371 struct ref_delta_entry *d = sorted_by_pos[i];
1372 enum object_type type;
1373 struct base_data *base_obj = alloc_base_data();
1374
1375 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1376 continue;
1377 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1378 if (!base_obj->data)
1379 continue;
1380
1381 if (check_sha1_signature(d->sha1, base_obj->data,
1382 base_obj->size, typename(type)))
1383 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1384 base_obj->obj = append_obj_to_pack(f, d->sha1,
1385 base_obj->data, base_obj->size, type);
1386 find_unresolved_deltas(base_obj);
1387 display_progress(progress, nr_resolved_deltas);
1388 }
1389 free(sorted_by_pos);
1390 }
1391
1392 static void final(const char *final_pack_name, const char *curr_pack_name,
1393 const char *final_index_name, const char *curr_index_name,
1394 const char *keep_name, const char *keep_msg,
1395 unsigned char *sha1)
1396 {
1397 const char *report = "pack";
1398 struct strbuf pack_name = STRBUF_INIT;
1399 struct strbuf index_name = STRBUF_INIT;
1400 struct strbuf keep_name_buf = STRBUF_INIT;
1401 int err;
1402
1403 if (!from_stdin) {
1404 close(input_fd);
1405 } else {
1406 fsync_or_die(output_fd, curr_pack_name);
1407 err = close(output_fd);
1408 if (err)
1409 die_errno(_("error while closing pack file"));
1410 }
1411
1412 if (keep_msg) {
1413 int keep_fd, keep_msg_len = strlen(keep_msg);
1414
1415 if (!keep_name)
1416 keep_name = odb_pack_name(&keep_name_buf, sha1, "keep");
1417
1418 keep_fd = odb_pack_keep(keep_name);
1419 if (keep_fd < 0) {
1420 if (errno != EEXIST)
1421 die_errno(_("cannot write keep file '%s'"),
1422 keep_name);
1423 } else {
1424 if (keep_msg_len > 0) {
1425 write_or_die(keep_fd, keep_msg, keep_msg_len);
1426 write_or_die(keep_fd, "\n", 1);
1427 }
1428 if (close(keep_fd) != 0)
1429 die_errno(_("cannot close written keep file '%s'"),
1430 keep_name);
1431 report = "keep";
1432 }
1433 }
1434
1435 if (final_pack_name != curr_pack_name) {
1436 if (!final_pack_name)
1437 final_pack_name = odb_pack_name(&pack_name, sha1, "pack");
1438 if (finalize_object_file(curr_pack_name, final_pack_name))
1439 die(_("cannot store pack file"));
1440 } else if (from_stdin)
1441 chmod(final_pack_name, 0444);
1442
1443 if (final_index_name != curr_index_name) {
1444 if (!final_index_name)
1445 final_index_name = odb_pack_name(&index_name, sha1, "idx");
1446 if (finalize_object_file(curr_index_name, final_index_name))
1447 die(_("cannot store index file"));
1448 } else
1449 chmod(final_index_name, 0444);
1450
1451 if (!from_stdin) {
1452 printf("%s\n", sha1_to_hex(sha1));
1453 } else {
1454 struct strbuf buf = STRBUF_INIT;
1455
1456 strbuf_addf(&buf, "%s\t%s\n", report, sha1_to_hex(sha1));
1457 write_or_die(1, buf.buf, buf.len);
1458 strbuf_release(&buf);
1459
1460 /*
1461 * Let's just mimic git-unpack-objects here and write
1462 * the last part of the input buffer to stdout.
1463 */
1464 while (input_len) {
1465 err = xwrite(1, input_buffer + input_offset, input_len);
1466 if (err <= 0)
1467 break;
1468 input_len -= err;
1469 input_offset += err;
1470 }
1471 }
1472
1473 strbuf_release(&index_name);
1474 strbuf_release(&pack_name);
1475 strbuf_release(&keep_name_buf);
1476 }
1477
1478 static int git_index_pack_config(const char *k, const char *v, void *cb)
1479 {
1480 struct pack_idx_option *opts = cb;
1481
1482 if (!strcmp(k, "pack.indexversion")) {
1483 opts->version = git_config_int(k, v);
1484 if (opts->version > 2)
1485 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1486 return 0;
1487 }
1488 if (!strcmp(k, "pack.threads")) {
1489 nr_threads = git_config_int(k, v);
1490 if (nr_threads < 0)
1491 die(_("invalid number of threads specified (%d)"),
1492 nr_threads);
1493 #ifdef NO_PTHREADS
1494 if (nr_threads != 1)
1495 warning(_("no threads support, ignoring %s"), k);
1496 nr_threads = 1;
1497 #endif
1498 return 0;
1499 }
1500 return git_default_config(k, v, cb);
1501 }
1502
1503 static int cmp_uint32(const void *a_, const void *b_)
1504 {
1505 uint32_t a = *((uint32_t *)a_);
1506 uint32_t b = *((uint32_t *)b_);
1507
1508 return (a < b) ? -1 : (a != b);
1509 }
1510
1511 static void read_v2_anomalous_offsets(struct packed_git *p,
1512 struct pack_idx_option *opts)
1513 {
1514 const uint32_t *idx1, *idx2;
1515 uint32_t i;
1516
1517 /* The address of the 4-byte offset table */
1518 idx1 = (((const uint32_t *)p->index_data)
1519 + 2 /* 8-byte header */
1520 + 256 /* fan out */
1521 + 5 * p->num_objects /* 20-byte SHA-1 table */
1522 + p->num_objects /* CRC32 table */
1523 );
1524
1525 /* The address of the 8-byte offset table */
1526 idx2 = idx1 + p->num_objects;
1527
1528 for (i = 0; i < p->num_objects; i++) {
1529 uint32_t off = ntohl(idx1[i]);
1530 if (!(off & 0x80000000))
1531 continue;
1532 off = off & 0x7fffffff;
1533 check_pack_index_ptr(p, &idx2[off * 2]);
1534 if (idx2[off * 2])
1535 continue;
1536 /*
1537 * The real offset is ntohl(idx2[off * 2]) in high 4
1538 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1539 * octets. But idx2[off * 2] is Zero!!!
1540 */
1541 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1542 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1543 }
1544
1545 QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
1546 }
1547
1548 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1549 {
1550 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1551
1552 if (!p)
1553 die(_("Cannot open existing pack file '%s'"), pack_name);
1554 if (open_pack_index(p))
1555 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1556
1557 /* Read the attributes from the existing idx file */
1558 opts->version = p->index_version;
1559
1560 if (opts->version == 2)
1561 read_v2_anomalous_offsets(p, opts);
1562
1563 /*
1564 * Get rid of the idx file as we do not need it anymore.
1565 * NEEDSWORK: extract this bit from free_pack_by_name() in
1566 * sha1_file.c, perhaps? It shouldn't matter very much as we
1567 * know we haven't installed this pack (hence we never have
1568 * read anything from it).
1569 */
1570 close_pack_index(p);
1571 free(p);
1572 }
1573
1574 static void show_pack_info(int stat_only)
1575 {
1576 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1577 unsigned long *chain_histogram = NULL;
1578
1579 if (deepest_delta)
1580 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1581
1582 for (i = 0; i < nr_objects; i++) {
1583 struct object_entry *obj = &objects[i];
1584
1585 if (is_delta_type(obj->type))
1586 chain_histogram[obj_stat[i].delta_depth - 1]++;
1587 if (stat_only)
1588 continue;
1589 printf("%s %-6s %lu %lu %"PRIuMAX,
1590 oid_to_hex(&obj->idx.oid),
1591 typename(obj->real_type), obj->size,
1592 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1593 (uintmax_t)obj->idx.offset);
1594 if (is_delta_type(obj->type)) {
1595 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1596 printf(" %u %s", obj_stat[i].delta_depth,
1597 oid_to_hex(&bobj->idx.oid));
1598 }
1599 putchar('\n');
1600 }
1601
1602 if (baseobjects)
1603 printf_ln(Q_("non delta: %d object",
1604 "non delta: %d objects",
1605 baseobjects),
1606 baseobjects);
1607 for (i = 0; i < deepest_delta; i++) {
1608 if (!chain_histogram[i])
1609 continue;
1610 printf_ln(Q_("chain length = %d: %lu object",
1611 "chain length = %d: %lu objects",
1612 chain_histogram[i]),
1613 i + 1,
1614 chain_histogram[i]);
1615 }
1616 }
1617
1618 static const char *derive_filename(const char *pack_name, const char *suffix,
1619 struct strbuf *buf)
1620 {
1621 size_t len;
1622 if (!strip_suffix(pack_name, ".pack", &len))
1623 die(_("packfile name '%s' does not end with '.pack'"),
1624 pack_name);
1625 strbuf_add(buf, pack_name, len);
1626 strbuf_addstr(buf, suffix);
1627 return buf->buf;
1628 }
1629
1630 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1631 {
1632 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1633 const char *curr_index;
1634 const char *index_name = NULL, *pack_name = NULL;
1635 const char *keep_name = NULL, *keep_msg = NULL;
1636 struct strbuf index_name_buf = STRBUF_INIT,
1637 keep_name_buf = STRBUF_INIT;
1638 struct pack_idx_entry **idx_objects;
1639 struct pack_idx_option opts;
1640 unsigned char pack_sha1[20];
1641 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1642 int report_end_of_input = 0;
1643
1644 if (argc == 2 && !strcmp(argv[1], "-h"))
1645 usage(index_pack_usage);
1646
1647 check_replace_refs = 0;
1648 fsck_options.walk = mark_link;
1649
1650 reset_pack_idx_option(&opts);
1651 git_config(git_index_pack_config, &opts);
1652 if (prefix && chdir(prefix))
1653 die(_("Cannot come back to cwd"));
1654
1655 for (i = 1; i < argc; i++) {
1656 const char *arg = argv[i];
1657
1658 if (*arg == '-') {
1659 if (!strcmp(arg, "--stdin")) {
1660 from_stdin = 1;
1661 } else if (!strcmp(arg, "--fix-thin")) {
1662 fix_thin_pack = 1;
1663 } else if (!strcmp(arg, "--strict")) {
1664 strict = 1;
1665 do_fsck_object = 1;
1666 } else if (skip_prefix(arg, "--strict=", &arg)) {
1667 strict = 1;
1668 do_fsck_object = 1;
1669 fsck_set_msg_types(&fsck_options, arg);
1670 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1671 strict = 1;
1672 check_self_contained_and_connected = 1;
1673 } else if (!strcmp(arg, "--verify")) {
1674 verify = 1;
1675 } else if (!strcmp(arg, "--verify-stat")) {
1676 verify = 1;
1677 show_stat = 1;
1678 } else if (!strcmp(arg, "--verify-stat-only")) {
1679 verify = 1;
1680 show_stat = 1;
1681 stat_only = 1;
1682 } else if (!strcmp(arg, "--keep")) {
1683 keep_msg = "";
1684 } else if (starts_with(arg, "--keep=")) {
1685 keep_msg = arg + 7;
1686 } else if (starts_with(arg, "--threads=")) {
1687 char *end;
1688 nr_threads = strtoul(arg+10, &end, 0);
1689 if (!arg[10] || *end || nr_threads < 0)
1690 usage(index_pack_usage);
1691 #ifdef NO_PTHREADS
1692 if (nr_threads != 1)
1693 warning(_("no threads support, "
1694 "ignoring %s"), arg);
1695 nr_threads = 1;
1696 #endif
1697 } else if (starts_with(arg, "--pack_header=")) {
1698 struct pack_header *hdr;
1699 char *c;
1700
1701 hdr = (struct pack_header *)input_buffer;
1702 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1703 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1704 if (*c != ',')
1705 die(_("bad %s"), arg);
1706 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1707 if (*c)
1708 die(_("bad %s"), arg);
1709 input_len = sizeof(*hdr);
1710 } else if (!strcmp(arg, "-v")) {
1711 verbose = 1;
1712 } else if (!strcmp(arg, "--show-resolving-progress")) {
1713 show_resolving_progress = 1;
1714 } else if (!strcmp(arg, "--report-end-of-input")) {
1715 report_end_of_input = 1;
1716 } else if (!strcmp(arg, "-o")) {
1717 if (index_name || (i+1) >= argc)
1718 usage(index_pack_usage);
1719 index_name = argv[++i];
1720 } else if (starts_with(arg, "--index-version=")) {
1721 char *c;
1722 opts.version = strtoul(arg + 16, &c, 10);
1723 if (opts.version > 2)
1724 die(_("bad %s"), arg);
1725 if (*c == ',')
1726 opts.off32_limit = strtoul(c+1, &c, 0);
1727 if (*c || opts.off32_limit & 0x80000000)
1728 die(_("bad %s"), arg);
1729 } else if (skip_prefix(arg, "--max-input-size=", &arg)) {
1730 max_input_size = strtoumax(arg, NULL, 10);
1731 } else
1732 usage(index_pack_usage);
1733 continue;
1734 }
1735
1736 if (pack_name)
1737 usage(index_pack_usage);
1738 pack_name = arg;
1739 }
1740
1741 if (!pack_name && !from_stdin)
1742 usage(index_pack_usage);
1743 if (fix_thin_pack && !from_stdin)
1744 die(_("--fix-thin cannot be used without --stdin"));
1745 if (from_stdin && !startup_info->have_repository)
1746 die(_("--stdin requires a git repository"));
1747 if (!index_name && pack_name)
1748 index_name = derive_filename(pack_name, ".idx", &index_name_buf);
1749 if (keep_msg && !keep_name && pack_name)
1750 keep_name = derive_filename(pack_name, ".keep", &keep_name_buf);
1751
1752 if (verify) {
1753 if (!index_name)
1754 die(_("--verify with no packfile name given"));
1755 read_idx_option(&opts, index_name);
1756 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1757 }
1758 if (strict)
1759 opts.flags |= WRITE_IDX_STRICT;
1760
1761 #ifndef NO_PTHREADS
1762 if (!nr_threads) {
1763 nr_threads = online_cpus();
1764 /* An experiment showed that more threads does not mean faster */
1765 if (nr_threads > 3)
1766 nr_threads = 3;
1767 }
1768 #endif
1769
1770 curr_pack = open_pack_file(pack_name);
1771 parse_pack_header();
1772 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1773 if (show_stat)
1774 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1775 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1776 parse_pack_objects(pack_sha1);
1777 if (report_end_of_input)
1778 write_in_full(2, "\0", 1);
1779 resolve_deltas();
1780 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1781 free(ofs_deltas);
1782 free(ref_deltas);
1783 if (strict)
1784 foreign_nr = check_objects();
1785
1786 if (show_stat)
1787 show_pack_info(stat_only);
1788
1789 ALLOC_ARRAY(idx_objects, nr_objects);
1790 for (i = 0; i < nr_objects; i++)
1791 idx_objects[i] = &objects[i].idx;
1792 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1793 free(idx_objects);
1794
1795 if (!verify)
1796 final(pack_name, curr_pack,
1797 index_name, curr_index,
1798 keep_name, keep_msg,
1799 pack_sha1);
1800 else
1801 close(input_fd);
1802 free(objects);
1803 strbuf_release(&index_name_buf);
1804 strbuf_release(&keep_name_buf);
1805 if (pack_name == NULL)
1806 free((void *) curr_pack);
1807 if (index_name == NULL)
1808 free((void *) curr_index);
1809
1810 /*
1811 * Let the caller know this pack is not self contained
1812 */
1813 if (check_self_contained_and_connected && foreign_nr)
1814 return 1;
1815
1816 return 0;
1817 }
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