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Merge branch 'kw/patch-ids-optim'
[git.git] / builtin / index-pack.c
blob1d2ea583a45507935ec2007d6c44f5e968a1aed5
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 unsigned deepest_delta;
91 static git_SHA_CTX input_ctx;
92 static uint32_t input_crc32;
93 static int input_fd, output_fd;
94 static const char *curr_pack;
95
96 #ifndef NO_PTHREADS
97
98 static struct thread_local *thread_data;
99 static int nr_dispatched;
100 static int threads_active;
101
102 static pthread_mutex_t read_mutex;
103 #define read_lock() lock_mutex(&read_mutex)
104 #define read_unlock() unlock_mutex(&read_mutex)
105
106 static pthread_mutex_t counter_mutex;
107 #define counter_lock() lock_mutex(&counter_mutex)
108 #define counter_unlock() unlock_mutex(&counter_mutex)
109
110 static pthread_mutex_t work_mutex;
111 #define work_lock() lock_mutex(&work_mutex)
112 #define work_unlock() unlock_mutex(&work_mutex)
113
114 static pthread_mutex_t deepest_delta_mutex;
115 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
116 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
117
118 static pthread_mutex_t type_cas_mutex;
119 #define type_cas_lock() lock_mutex(&type_cas_mutex)
120 #define type_cas_unlock() unlock_mutex(&type_cas_mutex)
121
122 static pthread_key_t key;
123
124 static inline void lock_mutex(pthread_mutex_t *mutex)
125 {
126 if (threads_active)
127 pthread_mutex_lock(mutex);
128 }
129
130 static inline void unlock_mutex(pthread_mutex_t *mutex)
131 {
132 if (threads_active)
133 pthread_mutex_unlock(mutex);
134 }
135
136 /*
137 * Mutex and conditional variable can't be statically-initialized on Windows.
138 */
139 static void init_thread(void)
140 {
141 int i;
142 init_recursive_mutex(&read_mutex);
143 pthread_mutex_init(&counter_mutex, NULL);
144 pthread_mutex_init(&work_mutex, NULL);
145 pthread_mutex_init(&type_cas_mutex, NULL);
146 if (show_stat)
147 pthread_mutex_init(&deepest_delta_mutex, NULL);
148 pthread_key_create(&key, NULL);
149 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
150 for (i = 0; i < nr_threads; i++) {
151 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
152 if (thread_data[i].pack_fd == -1)
153 die_errno(_("unable to open %s"), curr_pack);
154 }
155
156 threads_active = 1;
157 }
158
159 static void cleanup_thread(void)
160 {
161 int i;
162 if (!threads_active)
163 return;
164 threads_active = 0;
165 pthread_mutex_destroy(&read_mutex);
166 pthread_mutex_destroy(&counter_mutex);
167 pthread_mutex_destroy(&work_mutex);
168 pthread_mutex_destroy(&type_cas_mutex);
169 if (show_stat)
170 pthread_mutex_destroy(&deepest_delta_mutex);
171 for (i = 0; i < nr_threads; i++)
172 close(thread_data[i].pack_fd);
173 pthread_key_delete(key);
174 free(thread_data);
175 }
176
177 #else
178
179 #define read_lock()
180 #define read_unlock()
181
182 #define counter_lock()
183 #define counter_unlock()
184
185 #define work_lock()
186 #define work_unlock()
187
188 #define deepest_delta_lock()
189 #define deepest_delta_unlock()
190
191 #define type_cas_lock()
192 #define type_cas_unlock()
193
194 #endif
195
196
197 static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
198 {
199 if (!obj)
200 return -1;
201
202 if (type != OBJ_ANY && obj->type != type)
203 die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
204
205 obj->flags |= FLAG_LINK;
206 return 0;
207 }
208
209 /* The content of each linked object must have been checked
210 or it must be already present in the object database */
211 static unsigned check_object(struct object *obj)
212 {
213 if (!obj)
214 return 0;
215
216 if (!(obj->flags & FLAG_LINK))
217 return 0;
218
219 if (!(obj->flags & FLAG_CHECKED)) {
220 unsigned long size;
221 int type = sha1_object_info(obj->oid.hash, &size);
222 if (type <= 0)
223 die(_("did not receive expected object %s"),
224 oid_to_hex(&obj->oid));
225 if (type != obj->type)
226 die(_("object %s: expected type %s, found %s"),
227 oid_to_hex(&obj->oid),
228 typename(obj->type), typename(type));
229 obj->flags |= FLAG_CHECKED;
230 return 1;
231 }
232
233 return 0;
234 }
235
236 static unsigned check_objects(void)
237 {
238 unsigned i, max, foreign_nr = 0;
239
240 max = get_max_object_index();
241 for (i = 0; i < max; i++)
242 foreign_nr += check_object(get_indexed_object(i));
243 return foreign_nr;
244 }
245
246
247 /* Discard current buffer used content. */
248 static void flush(void)
249 {
250 if (input_offset) {
251 if (output_fd >= 0)
252 write_or_die(output_fd, input_buffer, input_offset);
253 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
254 memmove(input_buffer, input_buffer + input_offset, input_len);
255 input_offset = 0;
256 }
257 }
258
259 /*
260 * Make sure at least "min" bytes are available in the buffer, and
261 * return the pointer to the buffer.
262 */
263 static void *fill(int min)
264 {
265 if (min <= input_len)
266 return input_buffer + input_offset;
267 if (min > sizeof(input_buffer))
268 die(Q_("cannot fill %d byte",
269 "cannot fill %d bytes",
270 min),
271 min);
272 flush();
273 do {
274 ssize_t ret = xread(input_fd, input_buffer + input_len,
275 sizeof(input_buffer) - input_len);
276 if (ret <= 0) {
277 if (!ret)
278 die(_("early EOF"));
279 die_errno(_("read error on input"));
280 }
281 input_len += ret;
282 if (from_stdin)
283 display_throughput(progress, consumed_bytes + input_len);
284 } while (input_len < min);
285 return input_buffer;
286 }
287
288 static void use(int bytes)
289 {
290 if (bytes > input_len)
291 die(_("used more bytes than were available"));
292 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
293 input_len -= bytes;
294 input_offset += bytes;
295
296 /* make sure off_t is sufficiently large not to wrap */
297 if (signed_add_overflows(consumed_bytes, bytes))
298 die(_("pack too large for current definition of off_t"));
299 consumed_bytes += bytes;
300 }
301
302 static const char *open_pack_file(const char *pack_name)
303 {
304 if (from_stdin) {
305 input_fd = 0;
306 if (!pack_name) {
307 static char tmp_file[PATH_MAX];
308 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
309 "pack/tmp_pack_XXXXXX");
310 pack_name = xstrdup(tmp_file);
311 } else
312 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
313 if (output_fd < 0)
314 die_errno(_("unable to create '%s'"), pack_name);
315 nothread_data.pack_fd = output_fd;
316 } else {
317 input_fd = open(pack_name, O_RDONLY);
318 if (input_fd < 0)
319 die_errno(_("cannot open packfile '%s'"), pack_name);
320 output_fd = -1;
321 nothread_data.pack_fd = input_fd;
322 }
323 git_SHA1_Init(&input_ctx);
324 return pack_name;
325 }
326
327 static void parse_pack_header(void)
328 {
329 struct pack_header *hdr = fill(sizeof(struct pack_header));
330
331 /* Header consistency check */
332 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
333 die(_("pack signature mismatch"));
334 if (!pack_version_ok(hdr->hdr_version))
335 die(_("pack version %"PRIu32" unsupported"),
336 ntohl(hdr->hdr_version));
337
338 nr_objects = ntohl(hdr->hdr_entries);
339 use(sizeof(struct pack_header));
340 }
341
342 static NORETURN void bad_object(off_t offset, const char *format,
343 ...) __attribute__((format (printf, 2, 3)));
344
345 static NORETURN void bad_object(off_t offset, const char *format, ...)
346 {
347 va_list params;
348 char buf[1024];
349
350 va_start(params, format);
351 vsnprintf(buf, sizeof(buf), format, params);
352 va_end(params);
353 die(_("pack has bad object at offset %"PRIuMAX": %s"),
354 (uintmax_t)offset, buf);
355 }
356
357 static inline struct thread_local *get_thread_data(void)
358 {
359 #ifndef NO_PTHREADS
360 if (threads_active)
361 return pthread_getspecific(key);
362 assert(!threads_active &&
363 "This should only be reached when all threads are gone");
364 #endif
365 return &nothread_data;
366 }
367
368 #ifndef NO_PTHREADS
369 static void set_thread_data(struct thread_local *data)
370 {
371 if (threads_active)
372 pthread_setspecific(key, data);
373 }
374 #endif
375
376 static struct base_data *alloc_base_data(void)
377 {
378 struct base_data *base = xcalloc(1, sizeof(struct base_data));
379 base->ref_last = -1;
380 base->ofs_last = -1;
381 return base;
382 }
383
384 static void free_base_data(struct base_data *c)
385 {
386 if (c->data) {
387 free(c->data);
388 c->data = NULL;
389 get_thread_data()->base_cache_used -= c->size;
390 }
391 }
392
393 static void prune_base_data(struct base_data *retain)
394 {
395 struct base_data *b;
396 struct thread_local *data = get_thread_data();
397 for (b = data->base_cache;
398 data->base_cache_used > delta_base_cache_limit && b;
399 b = b->child) {
400 if (b->data && b != retain)
401 free_base_data(b);
402 }
403 }
404
405 static void link_base_data(struct base_data *base, struct base_data *c)
406 {
407 if (base)
408 base->child = c;
409 else
410 get_thread_data()->base_cache = c;
411
412 c->base = base;
413 c->child = NULL;
414 if (c->data)
415 get_thread_data()->base_cache_used += c->size;
416 prune_base_data(c);
417 }
418
419 static void unlink_base_data(struct base_data *c)
420 {
421 struct base_data *base = c->base;
422 if (base)
423 base->child = NULL;
424 else
425 get_thread_data()->base_cache = NULL;
426 free_base_data(c);
427 }
428
429 static int is_delta_type(enum object_type type)
430 {
431 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
432 }
433
434 static void *unpack_entry_data(off_t offset, unsigned long size,
435 enum object_type type, unsigned char *sha1)
436 {
437 static char fixed_buf[8192];
438 int status;
439 git_zstream stream;
440 void *buf;
441 git_SHA_CTX c;
442 char hdr[32];
443 int hdrlen;
444
445 if (!is_delta_type(type)) {
446 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), size) + 1;
447 git_SHA1_Init(&c);
448 git_SHA1_Update(&c, hdr, hdrlen);
449 } else
450 sha1 = NULL;
451 if (type == OBJ_BLOB && size > big_file_threshold)
452 buf = fixed_buf;
453 else
454 buf = xmallocz(size);
455
456 memset(&stream, 0, sizeof(stream));
457 git_inflate_init(&stream);
458 stream.next_out = buf;
459 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
460
461 do {
462 unsigned char *last_out = stream.next_out;
463 stream.next_in = fill(1);
464 stream.avail_in = input_len;
465 status = git_inflate(&stream, 0);
466 use(input_len - stream.avail_in);
467 if (sha1)
468 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
469 if (buf == fixed_buf) {
470 stream.next_out = buf;
471 stream.avail_out = sizeof(fixed_buf);
472 }
473 } while (status == Z_OK);
474 if (stream.total_out != size || status != Z_STREAM_END)
475 bad_object(offset, _("inflate returned %d"), status);
476 git_inflate_end(&stream);
477 if (sha1)
478 git_SHA1_Final(sha1, &c);
479 return buf == fixed_buf ? NULL : buf;
480 }
481
482 static void *unpack_raw_entry(struct object_entry *obj,
483 off_t *ofs_offset,
484 unsigned char *ref_sha1,
485 unsigned char *sha1)
486 {
487 unsigned char *p;
488 unsigned long size, c;
489 off_t base_offset;
490 unsigned shift;
491 void *data;
492
493 obj->idx.offset = consumed_bytes;
494 input_crc32 = crc32(0, NULL, 0);
495
496 p = fill(1);
497 c = *p;
498 use(1);
499 obj->type = (c >> 4) & 7;
500 size = (c & 15);
501 shift = 4;
502 while (c & 0x80) {
503 p = fill(1);
504 c = *p;
505 use(1);
506 size += (c & 0x7f) << shift;
507 shift += 7;
508 }
509 obj->size = size;
510
511 switch (obj->type) {
512 case OBJ_REF_DELTA:
513 hashcpy(ref_sha1, fill(20));
514 use(20);
515 break;
516 case OBJ_OFS_DELTA:
517 p = fill(1);
518 c = *p;
519 use(1);
520 base_offset = c & 127;
521 while (c & 128) {
522 base_offset += 1;
523 if (!base_offset || MSB(base_offset, 7))
524 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
525 p = fill(1);
526 c = *p;
527 use(1);
528 base_offset = (base_offset << 7) + (c & 127);
529 }
530 *ofs_offset = obj->idx.offset - base_offset;
531 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
532 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
533 break;
534 case OBJ_COMMIT:
535 case OBJ_TREE:
536 case OBJ_BLOB:
537 case OBJ_TAG:
538 break;
539 default:
540 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
541 }
542 obj->hdr_size = consumed_bytes - obj->idx.offset;
543
544 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
545 obj->idx.crc32 = input_crc32;
546 return data;
547 }
548
549 static void *unpack_data(struct object_entry *obj,
550 int (*consume)(const unsigned char *, unsigned long, void *),
551 void *cb_data)
552 {
553 off_t from = obj[0].idx.offset + obj[0].hdr_size;
554 off_t len = obj[1].idx.offset - from;
555 unsigned char *data, *inbuf;
556 git_zstream stream;
557 int status;
558
559 data = xmallocz(consume ? 64*1024 : obj->size);
560 inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
561
562 memset(&stream, 0, sizeof(stream));
563 git_inflate_init(&stream);
564 stream.next_out = data;
565 stream.avail_out = consume ? 64*1024 : obj->size;
566
567 do {
568 ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
569 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
570 if (n < 0)
571 die_errno(_("cannot pread pack file"));
572 if (!n)
573 die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
574 "premature end of pack file, %"PRIuMAX" bytes missing",
575 (unsigned int)len),
576 (uintmax_t)len);
577 from += n;
578 len -= n;
579 stream.next_in = inbuf;
580 stream.avail_in = n;
581 if (!consume)
582 status = git_inflate(&stream, 0);
583 else {
584 do {
585 status = git_inflate(&stream, 0);
586 if (consume(data, stream.next_out - data, cb_data)) {
587 free(inbuf);
588 free(data);
589 return NULL;
590 }
591 stream.next_out = data;
592 stream.avail_out = 64*1024;
593 } while (status == Z_OK && stream.avail_in);
594 }
595 } while (len && status == Z_OK && !stream.avail_in);
596
597 /* This has been inflated OK when first encountered, so... */
598 if (status != Z_STREAM_END || stream.total_out != obj->size)
599 die(_("serious inflate inconsistency"));
600
601 git_inflate_end(&stream);
602 free(inbuf);
603 if (consume) {
604 free(data);
605 data = NULL;
606 }
607 return data;
608 }
609
610 static void *get_data_from_pack(struct object_entry *obj)
611 {
612 return unpack_data(obj, NULL, NULL);
613 }
614
615 static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
616 enum object_type type1,
617 enum object_type type2)
618 {
619 int cmp = type1 - type2;
620 if (cmp)
621 return cmp;
622 return offset1 < offset2 ? -1 :
623 offset1 > offset2 ? 1 :
624 0;
625 }
626
627 static int find_ofs_delta(const off_t offset, enum object_type type)
628 {
629 int first = 0, last = nr_ofs_deltas;
630
631 while (first < last) {
632 int next = (first + last) / 2;
633 struct ofs_delta_entry *delta = &ofs_deltas[next];
634 int cmp;
635
636 cmp = compare_ofs_delta_bases(offset, delta->offset,
637 type, objects[delta->obj_no].type);
638 if (!cmp)
639 return next;
640 if (cmp < 0) {
641 last = next;
642 continue;
643 }
644 first = next+1;
645 }
646 return -first-1;
647 }
648
649 static void find_ofs_delta_children(off_t offset,
650 int *first_index, int *last_index,
651 enum object_type type)
652 {
653 int first = find_ofs_delta(offset, type);
654 int last = first;
655 int end = nr_ofs_deltas - 1;
656
657 if (first < 0) {
658 *first_index = 0;
659 *last_index = -1;
660 return;
661 }
662 while (first > 0 && ofs_deltas[first - 1].offset == offset)
663 --first;
664 while (last < end && ofs_deltas[last + 1].offset == offset)
665 ++last;
666 *first_index = first;
667 *last_index = last;
668 }
669
670 static int compare_ref_delta_bases(const unsigned char *sha1,
671 const unsigned char *sha2,
672 enum object_type type1,
673 enum object_type type2)
674 {
675 int cmp = type1 - type2;
676 if (cmp)
677 return cmp;
678 return hashcmp(sha1, sha2);
679 }
680
681 static int find_ref_delta(const unsigned char *sha1, enum object_type type)
682 {
683 int first = 0, last = nr_ref_deltas;
684
685 while (first < last) {
686 int next = (first + last) / 2;
687 struct ref_delta_entry *delta = &ref_deltas[next];
688 int cmp;
689
690 cmp = compare_ref_delta_bases(sha1, delta->sha1,
691 type, objects[delta->obj_no].type);
692 if (!cmp)
693 return next;
694 if (cmp < 0) {
695 last = next;
696 continue;
697 }
698 first = next+1;
699 }
700 return -first-1;
701 }
702
703 static void find_ref_delta_children(const unsigned char *sha1,
704 int *first_index, int *last_index,
705 enum object_type type)
706 {
707 int first = find_ref_delta(sha1, type);
708 int last = first;
709 int end = nr_ref_deltas - 1;
710
711 if (first < 0) {
712 *first_index = 0;
713 *last_index = -1;
714 return;
715 }
716 while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
717 --first;
718 while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
719 ++last;
720 *first_index = first;
721 *last_index = last;
722 }
723
724 struct compare_data {
725 struct object_entry *entry;
726 struct git_istream *st;
727 unsigned char *buf;
728 unsigned long buf_size;
729 };
730
731 static int compare_objects(const unsigned char *buf, unsigned long size,
732 void *cb_data)
733 {
734 struct compare_data *data = cb_data;
735
736 if (data->buf_size < size) {
737 free(data->buf);
738 data->buf = xmalloc(size);
739 data->buf_size = size;
740 }
741
742 while (size) {
743 ssize_t len = read_istream(data->st, data->buf, size);
744 if (len == 0)
745 die(_("SHA1 COLLISION FOUND WITH %s !"),
746 sha1_to_hex(data->entry->idx.sha1));
747 if (len < 0)
748 die(_("unable to read %s"),
749 sha1_to_hex(data->entry->idx.sha1));
750 if (memcmp(buf, data->buf, len))
751 die(_("SHA1 COLLISION FOUND WITH %s !"),
752 sha1_to_hex(data->entry->idx.sha1));
753 size -= len;
754 buf += len;
755 }
756 return 0;
757 }
758
759 static int check_collison(struct object_entry *entry)
760 {
761 struct compare_data data;
762 enum object_type type;
763 unsigned long size;
764
765 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
766 return -1;
767
768 memset(&data, 0, sizeof(data));
769 data.entry = entry;
770 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
771 if (!data.st)
772 return -1;
773 if (size != entry->size || type != entry->type)
774 die(_("SHA1 COLLISION FOUND WITH %s !"),
775 sha1_to_hex(entry->idx.sha1));
776 unpack_data(entry, compare_objects, &data);
777 close_istream(data.st);
778 free(data.buf);
779 return 0;
780 }
781
782 static void sha1_object(const void *data, struct object_entry *obj_entry,
783 unsigned long size, enum object_type type,
784 const unsigned char *sha1)
785 {
786 void *new_data = NULL;
787 int collision_test_needed;
788
789 assert(data || obj_entry);
790
791 read_lock();
792 collision_test_needed = has_sha1_file_with_flags(sha1, HAS_SHA1_QUICK);
793 read_unlock();
794
795 if (collision_test_needed && !data) {
796 read_lock();
797 if (!check_collison(obj_entry))
798 collision_test_needed = 0;
799 read_unlock();
800 }
801 if (collision_test_needed) {
802 void *has_data;
803 enum object_type has_type;
804 unsigned long has_size;
805 read_lock();
806 has_type = sha1_object_info(sha1, &has_size);
807 if (has_type != type || has_size != size)
808 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
809 has_data = read_sha1_file(sha1, &has_type, &has_size);
810 read_unlock();
811 if (!data)
812 data = new_data = get_data_from_pack(obj_entry);
813 if (!has_data)
814 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
815 if (size != has_size || type != has_type ||
816 memcmp(data, has_data, size) != 0)
817 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
818 free(has_data);
819 }
820
821 if (strict) {
822 read_lock();
823 if (type == OBJ_BLOB) {
824 struct blob *blob = lookup_blob(sha1);
825 if (blob)
826 blob->object.flags |= FLAG_CHECKED;
827 else
828 die(_("invalid blob object %s"), sha1_to_hex(sha1));
829 } else {
830 struct object *obj;
831 int eaten;
832 void *buf = (void *) data;
833
834 assert(data && "data can only be NULL for large _blobs_");
835
836 /*
837 * we do not need to free the memory here, as the
838 * buf is deleted by the caller.
839 */
840 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
841 if (!obj)
842 die(_("invalid %s"), typename(type));
843 if (do_fsck_object &&
844 fsck_object(obj, buf, size, &fsck_options))
845 die(_("Error in object"));
846 if (fsck_walk(obj, NULL, &fsck_options))
847 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
848
849 if (obj->type == OBJ_TREE) {
850 struct tree *item = (struct tree *) obj;
851 item->buffer = NULL;
852 obj->parsed = 0;
853 }
854 if (obj->type == OBJ_COMMIT) {
855 struct commit *commit = (struct commit *) obj;
856 if (detach_commit_buffer(commit, NULL) != data)
857 die("BUG: parse_object_buffer transmogrified our buffer");
858 }
859 obj->flags |= FLAG_CHECKED;
860 }
861 read_unlock();
862 }
863
864 free(new_data);
865 }
866
867 /*
868 * This function is part of find_unresolved_deltas(). There are two
869 * walkers going in the opposite ways.
870 *
871 * The first one in find_unresolved_deltas() traverses down from
872 * parent node to children, deflating nodes along the way. However,
873 * memory for deflated nodes is limited by delta_base_cache_limit, so
874 * at some point parent node's deflated content may be freed.
875 *
876 * The second walker is this function, which goes from current node up
877 * to top parent if necessary to deflate the node. In normal
878 * situation, its parent node would be already deflated, so it just
879 * needs to apply delta.
880 *
881 * In the worst case scenario, parent node is no longer deflated because
882 * we're running out of delta_base_cache_limit; we need to re-deflate
883 * parents, possibly up to the top base.
884 *
885 * All deflated objects here are subject to be freed if we exceed
886 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
887 * just need to make sure the last node is not freed.
888 */
889 static void *get_base_data(struct base_data *c)
890 {
891 if (!c->data) {
892 struct object_entry *obj = c->obj;
893 struct base_data **delta = NULL;
894 int delta_nr = 0, delta_alloc = 0;
895
896 while (is_delta_type(c->obj->type) && !c->data) {
897 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
898 delta[delta_nr++] = c;
899 c = c->base;
900 }
901 if (!delta_nr) {
902 c->data = get_data_from_pack(obj);
903 c->size = obj->size;
904 get_thread_data()->base_cache_used += c->size;
905 prune_base_data(c);
906 }
907 for (; delta_nr > 0; delta_nr--) {
908 void *base, *raw;
909 c = delta[delta_nr - 1];
910 obj = c->obj;
911 base = get_base_data(c->base);
912 raw = get_data_from_pack(obj);
913 c->data = patch_delta(
914 base, c->base->size,
915 raw, obj->size,
916 &c->size);
917 free(raw);
918 if (!c->data)
919 bad_object(obj->idx.offset, _("failed to apply delta"));
920 get_thread_data()->base_cache_used += c->size;
921 prune_base_data(c);
922 }
923 free(delta);
924 }
925 return c->data;
926 }
927
928 static void resolve_delta(struct object_entry *delta_obj,
929 struct base_data *base, struct base_data *result)
930 {
931 void *base_data, *delta_data;
932
933 if (show_stat) {
934 int i = delta_obj - objects;
935 int j = base->obj - objects;
936 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
937 deepest_delta_lock();
938 if (deepest_delta < obj_stat[i].delta_depth)
939 deepest_delta = obj_stat[i].delta_depth;
940 deepest_delta_unlock();
941 obj_stat[i].base_object_no = j;
942 }
943 delta_data = get_data_from_pack(delta_obj);
944 base_data = get_base_data(base);
945 result->obj = delta_obj;
946 result->data = patch_delta(base_data, base->size,
947 delta_data, delta_obj->size, &result->size);
948 free(delta_data);
949 if (!result->data)
950 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
951 hash_sha1_file(result->data, result->size,
952 typename(delta_obj->real_type), delta_obj->idx.sha1);
953 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
954 delta_obj->idx.sha1);
955 counter_lock();
956 nr_resolved_deltas++;
957 counter_unlock();
958 }
959
960 /*
961 * Standard boolean compare-and-swap: atomically check whether "*type" is
962 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
963 * and return false.
964 */
965 static int compare_and_swap_type(signed char *type,
966 enum object_type want,
967 enum object_type set)
968 {
969 enum object_type old;
970
971 type_cas_lock();
972 old = *type;
973 if (old == want)
974 *type = set;
975 type_cas_unlock();
976
977 return old == want;
978 }
979
980 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
981 struct base_data *prev_base)
982 {
983 if (base->ref_last == -1 && base->ofs_last == -1) {
984 find_ref_delta_children(base->obj->idx.sha1,
985 &base->ref_first, &base->ref_last,
986 OBJ_REF_DELTA);
987
988 find_ofs_delta_children(base->obj->idx.offset,
989 &base->ofs_first, &base->ofs_last,
990 OBJ_OFS_DELTA);
991
992 if (base->ref_last == -1 && base->ofs_last == -1) {
993 free(base->data);
994 return NULL;
995 }
996
997 link_base_data(prev_base, base);
998 }
999
1000 if (base->ref_first <= base->ref_last) {
1001 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1002 struct base_data *result = alloc_base_data();
1003
1004 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1005 base->obj->real_type))
1006 die("BUG: child->real_type != OBJ_REF_DELTA");
1007
1008 resolve_delta(child, base, result);
1009 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1010 free_base_data(base);
1011
1012 base->ref_first++;
1013 return result;
1014 }
1015
1016 if (base->ofs_first <= base->ofs_last) {
1017 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1018 struct base_data *result = alloc_base_data();
1019
1020 assert(child->real_type == OBJ_OFS_DELTA);
1021 child->real_type = base->obj->real_type;
1022 resolve_delta(child, base, result);
1023 if (base->ofs_first == base->ofs_last)
1024 free_base_data(base);
1025
1026 base->ofs_first++;
1027 return result;
1028 }
1029
1030 unlink_base_data(base);
1031 return NULL;
1032 }
1033
1034 static void find_unresolved_deltas(struct base_data *base)
1035 {
1036 struct base_data *new_base, *prev_base = NULL;
1037 for (;;) {
1038 new_base = find_unresolved_deltas_1(base, prev_base);
1039
1040 if (new_base) {
1041 prev_base = base;
1042 base = new_base;
1043 } else {
1044 free(base);
1045 base = prev_base;
1046 if (!base)
1047 return;
1048 prev_base = base->base;
1049 }
1050 }
1051 }
1052
1053 static int compare_ofs_delta_entry(const void *a, const void *b)
1054 {
1055 const struct ofs_delta_entry *delta_a = a;
1056 const struct ofs_delta_entry *delta_b = b;
1057
1058 return delta_a->offset < delta_b->offset ? -1 :
1059 delta_a->offset > delta_b->offset ? 1 :
1060 0;
1061 }
1062
1063 static int compare_ref_delta_entry(const void *a, const void *b)
1064 {
1065 const struct ref_delta_entry *delta_a = a;
1066 const struct ref_delta_entry *delta_b = b;
1067
1068 return hashcmp(delta_a->sha1, delta_b->sha1);
1069 }
1070
1071 static void resolve_base(struct object_entry *obj)
1072 {
1073 struct base_data *base_obj = alloc_base_data();
1074 base_obj->obj = obj;
1075 base_obj->data = NULL;
1076 find_unresolved_deltas(base_obj);
1077 }
1078
1079 #ifndef NO_PTHREADS
1080 static void *threaded_second_pass(void *data)
1081 {
1082 set_thread_data(data);
1083 for (;;) {
1084 int i;
1085 counter_lock();
1086 display_progress(progress, nr_resolved_deltas);
1087 counter_unlock();
1088 work_lock();
1089 while (nr_dispatched < nr_objects &&
1090 is_delta_type(objects[nr_dispatched].type))
1091 nr_dispatched++;
1092 if (nr_dispatched >= nr_objects) {
1093 work_unlock();
1094 break;
1095 }
1096 i = nr_dispatched++;
1097 work_unlock();
1098
1099 resolve_base(&objects[i]);
1100 }
1101 return NULL;
1102 }
1103 #endif
1104
1105 /*
1106 * First pass:
1107 * - find locations of all objects;
1108 * - calculate SHA1 of all non-delta objects;
1109 * - remember base (SHA1 or offset) for all deltas.
1110 */
1111 static void parse_pack_objects(unsigned char *sha1)
1112 {
1113 int i, nr_delays = 0;
1114 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1115 unsigned char ref_delta_sha1[20];
1116 struct stat st;
1117
1118 if (verbose)
1119 progress = start_progress(
1120 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1121 nr_objects);
1122 for (i = 0; i < nr_objects; i++) {
1123 struct object_entry *obj = &objects[i];
1124 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1125 ref_delta_sha1, obj->idx.sha1);
1126 obj->real_type = obj->type;
1127 if (obj->type == OBJ_OFS_DELTA) {
1128 nr_ofs_deltas++;
1129 ofs_delta->obj_no = i;
1130 ofs_delta++;
1131 } else if (obj->type == OBJ_REF_DELTA) {
1132 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1133 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_sha1);
1134 ref_deltas[nr_ref_deltas].obj_no = i;
1135 nr_ref_deltas++;
1136 } else if (!data) {
1137 /* large blobs, check later */
1138 obj->real_type = OBJ_BAD;
1139 nr_delays++;
1140 } else
1141 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1142 free(data);
1143 display_progress(progress, i+1);
1144 }
1145 objects[i].idx.offset = consumed_bytes;
1146 stop_progress(&progress);
1147
1148 /* Check pack integrity */
1149 flush();
1150 git_SHA1_Final(sha1, &input_ctx);
1151 if (hashcmp(fill(20), sha1))
1152 die(_("pack is corrupted (SHA1 mismatch)"));
1153 use(20);
1154
1155 /* If input_fd is a file, we should have reached its end now. */
1156 if (fstat(input_fd, &st))
1157 die_errno(_("cannot fstat packfile"));
1158 if (S_ISREG(st.st_mode) &&
1159 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1160 die(_("pack has junk at the end"));
1161
1162 for (i = 0; i < nr_objects; i++) {
1163 struct object_entry *obj = &objects[i];
1164 if (obj->real_type != OBJ_BAD)
1165 continue;
1166 obj->real_type = obj->type;
1167 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1168 nr_delays--;
1169 }
1170 if (nr_delays)
1171 die(_("confusion beyond insanity in parse_pack_objects()"));
1172 }
1173
1174 /*
1175 * Second pass:
1176 * - for all non-delta objects, look if it is used as a base for
1177 * deltas;
1178 * - if used as a base, uncompress the object and apply all deltas,
1179 * recursively checking if the resulting object is used as a base
1180 * for some more deltas.
1181 */
1182 static void resolve_deltas(void)
1183 {
1184 int i;
1185
1186 if (!nr_ofs_deltas && !nr_ref_deltas)
1187 return;
1188
1189 /* Sort deltas by base SHA1/offset for fast searching */
1190 qsort(ofs_deltas, nr_ofs_deltas, sizeof(struct ofs_delta_entry),
1191 compare_ofs_delta_entry);
1192 qsort(ref_deltas, nr_ref_deltas, sizeof(struct ref_delta_entry),
1193 compare_ref_delta_entry);
1194
1195 if (verbose || show_resolving_progress)
1196 progress = start_progress(_("Resolving deltas"),
1197 nr_ref_deltas + nr_ofs_deltas);
1198
1199 #ifndef NO_PTHREADS
1200 nr_dispatched = 0;
1201 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1202 init_thread();
1203 for (i = 0; i < nr_threads; i++) {
1204 int ret = pthread_create(&thread_data[i].thread, NULL,
1205 threaded_second_pass, thread_data + i);
1206 if (ret)
1207 die(_("unable to create thread: %s"),
1208 strerror(ret));
1209 }
1210 for (i = 0; i < nr_threads; i++)
1211 pthread_join(thread_data[i].thread, NULL);
1212 cleanup_thread();
1213 return;
1214 }
1215 #endif
1216
1217 for (i = 0; i < nr_objects; i++) {
1218 struct object_entry *obj = &objects[i];
1219
1220 if (is_delta_type(obj->type))
1221 continue;
1222 resolve_base(obj);
1223 display_progress(progress, nr_resolved_deltas);
1224 }
1225 }
1226
1227 /*
1228 * Third pass:
1229 * - append objects to convert thin pack to full pack if required
1230 * - write the final 20-byte SHA-1
1231 */
1232 static void fix_unresolved_deltas(struct sha1file *f);
1233 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1234 {
1235 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1236 stop_progress(&progress);
1237 /* Flush remaining pack final 20-byte SHA1. */
1238 flush();
1239 return;
1240 }
1241
1242 if (fix_thin_pack) {
1243 struct sha1file *f;
1244 unsigned char read_sha1[20], tail_sha1[20];
1245 struct strbuf msg = STRBUF_INIT;
1246 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1247 int nr_objects_initial = nr_objects;
1248 if (nr_unresolved <= 0)
1249 die(_("confusion beyond insanity"));
1250 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1251 memset(objects + nr_objects + 1, 0,
1252 nr_unresolved * sizeof(*objects));
1253 f = sha1fd(output_fd, curr_pack);
1254 fix_unresolved_deltas(f);
1255 strbuf_addf(&msg, Q_("completed with %d local object",
1256 "completed with %d local objects",
1257 nr_objects - nr_objects_initial),
1258 nr_objects - nr_objects_initial);
1259 stop_progress_msg(&progress, msg.buf);
1260 strbuf_release(&msg);
1261 sha1close(f, tail_sha1, 0);
1262 hashcpy(read_sha1, pack_sha1);
1263 fixup_pack_header_footer(output_fd, pack_sha1,
1264 curr_pack, nr_objects,
1265 read_sha1, consumed_bytes-20);
1266 if (hashcmp(read_sha1, tail_sha1) != 0)
1267 die(_("Unexpected tail checksum for %s "
1268 "(disk corruption?)"), curr_pack);
1269 }
1270 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1271 die(Q_("pack has %d unresolved delta",
1272 "pack has %d unresolved deltas",
1273 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1274 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1275 }
1276
1277 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1278 {
1279 git_zstream stream;
1280 int status;
1281 unsigned char outbuf[4096];
1282
1283 git_deflate_init(&stream, zlib_compression_level);
1284 stream.next_in = in;
1285 stream.avail_in = size;
1286
1287 do {
1288 stream.next_out = outbuf;
1289 stream.avail_out = sizeof(outbuf);
1290 status = git_deflate(&stream, Z_FINISH);
1291 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1292 } while (status == Z_OK);
1293
1294 if (status != Z_STREAM_END)
1295 die(_("unable to deflate appended object (%d)"), status);
1296 size = stream.total_out;
1297 git_deflate_end(&stream);
1298 return size;
1299 }
1300
1301 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1302 const unsigned char *sha1, void *buf,
1303 unsigned long size, enum object_type type)
1304 {
1305 struct object_entry *obj = &objects[nr_objects++];
1306 unsigned char header[10];
1307 unsigned long s = size;
1308 int n = 0;
1309 unsigned char c = (type << 4) | (s & 15);
1310 s >>= 4;
1311 while (s) {
1312 header[n++] = c | 0x80;
1313 c = s & 0x7f;
1314 s >>= 7;
1315 }
1316 header[n++] = c;
1317 crc32_begin(f);
1318 sha1write(f, header, n);
1319 obj[0].size = size;
1320 obj[0].hdr_size = n;
1321 obj[0].type = type;
1322 obj[0].real_type = type;
1323 obj[1].idx.offset = obj[0].idx.offset + n;
1324 obj[1].idx.offset += write_compressed(f, buf, size);
1325 obj[0].idx.crc32 = crc32_end(f);
1326 sha1flush(f);
1327 hashcpy(obj->idx.sha1, sha1);
1328 return obj;
1329 }
1330
1331 static int delta_pos_compare(const void *_a, const void *_b)
1332 {
1333 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1334 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1335 return a->obj_no - b->obj_no;
1336 }
1337
1338 static void fix_unresolved_deltas(struct sha1file *f)
1339 {
1340 struct ref_delta_entry **sorted_by_pos;
1341 int i;
1342
1343 /*
1344 * Since many unresolved deltas may well be themselves base objects
1345 * for more unresolved deltas, we really want to include the
1346 * smallest number of base objects that would cover as much delta
1347 * as possible by picking the
1348 * trunc deltas first, allowing for other deltas to resolve without
1349 * additional base objects. Since most base objects are to be found
1350 * before deltas depending on them, a good heuristic is to start
1351 * resolving deltas in the same order as their position in the pack.
1352 */
1353 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1354 for (i = 0; i < nr_ref_deltas; i++)
1355 sorted_by_pos[i] = &ref_deltas[i];
1356 qsort(sorted_by_pos, nr_ref_deltas, sizeof(*sorted_by_pos), delta_pos_compare);
1357
1358 for (i = 0; i < nr_ref_deltas; i++) {
1359 struct ref_delta_entry *d = sorted_by_pos[i];
1360 enum object_type type;
1361 struct base_data *base_obj = alloc_base_data();
1362
1363 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1364 continue;
1365 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1366 if (!base_obj->data)
1367 continue;
1368
1369 if (check_sha1_signature(d->sha1, base_obj->data,
1370 base_obj->size, typename(type)))
1371 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1372 base_obj->obj = append_obj_to_pack(f, d->sha1,
1373 base_obj->data, base_obj->size, type);
1374 find_unresolved_deltas(base_obj);
1375 display_progress(progress, nr_resolved_deltas);
1376 }
1377 free(sorted_by_pos);
1378 }
1379
1380 static void final(const char *final_pack_name, const char *curr_pack_name,
1381 const char *final_index_name, const char *curr_index_name,
1382 const char *keep_name, const char *keep_msg,
1383 unsigned char *sha1)
1384 {
1385 const char *report = "pack";
1386 char name[PATH_MAX];
1387 int err;
1388
1389 if (!from_stdin) {
1390 close(input_fd);
1391 } else {
1392 fsync_or_die(output_fd, curr_pack_name);
1393 err = close(output_fd);
1394 if (err)
1395 die_errno(_("error while closing pack file"));
1396 }
1397
1398 if (keep_msg) {
1399 int keep_fd, keep_msg_len = strlen(keep_msg);
1400
1401 if (!keep_name)
1402 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1403 else
1404 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1405
1406 if (keep_fd < 0) {
1407 if (errno != EEXIST)
1408 die_errno(_("cannot write keep file '%s'"),
1409 keep_name ? keep_name : name);
1410 } else {
1411 if (keep_msg_len > 0) {
1412 write_or_die(keep_fd, keep_msg, keep_msg_len);
1413 write_or_die(keep_fd, "\n", 1);
1414 }
1415 if (close(keep_fd) != 0)
1416 die_errno(_("cannot close written keep file '%s'"),
1417 keep_name ? keep_name : name);
1418 report = "keep";
1419 }
1420 }
1421
1422 if (final_pack_name != curr_pack_name) {
1423 if (!final_pack_name) {
1424 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1425 get_object_directory(), sha1_to_hex(sha1));
1426 final_pack_name = name;
1427 }
1428 if (finalize_object_file(curr_pack_name, final_pack_name))
1429 die(_("cannot store pack file"));
1430 } else if (from_stdin)
1431 chmod(final_pack_name, 0444);
1432
1433 if (final_index_name != curr_index_name) {
1434 if (!final_index_name) {
1435 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1436 get_object_directory(), sha1_to_hex(sha1));
1437 final_index_name = name;
1438 }
1439 if (finalize_object_file(curr_index_name, final_index_name))
1440 die(_("cannot store index file"));
1441 } else
1442 chmod(final_index_name, 0444);
1443
1444 if (!from_stdin) {
1445 printf("%s\n", sha1_to_hex(sha1));
1446 } else {
1447 char buf[48];
1448 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1449 report, sha1_to_hex(sha1));
1450 write_or_die(1, buf, len);
1451
1452 /*
1453 * Let's just mimic git-unpack-objects here and write
1454 * the last part of the input buffer to stdout.
1455 */
1456 while (input_len) {
1457 err = xwrite(1, input_buffer + input_offset, input_len);
1458 if (err <= 0)
1459 break;
1460 input_len -= err;
1461 input_offset += err;
1462 }
1463 }
1464 }
1465
1466 static int git_index_pack_config(const char *k, const char *v, void *cb)
1467 {
1468 struct pack_idx_option *opts = cb;
1469
1470 if (!strcmp(k, "pack.indexversion")) {
1471 opts->version = git_config_int(k, v);
1472 if (opts->version > 2)
1473 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1474 return 0;
1475 }
1476 if (!strcmp(k, "pack.threads")) {
1477 nr_threads = git_config_int(k, v);
1478 if (nr_threads < 0)
1479 die(_("invalid number of threads specified (%d)"),
1480 nr_threads);
1481 #ifdef NO_PTHREADS
1482 if (nr_threads != 1)
1483 warning(_("no threads support, ignoring %s"), k);
1484 nr_threads = 1;
1485 #endif
1486 return 0;
1487 }
1488 return git_default_config(k, v, cb);
1489 }
1490
1491 static int cmp_uint32(const void *a_, const void *b_)
1492 {
1493 uint32_t a = *((uint32_t *)a_);
1494 uint32_t b = *((uint32_t *)b_);
1495
1496 return (a < b) ? -1 : (a != b);
1497 }
1498
1499 static void read_v2_anomalous_offsets(struct packed_git *p,
1500 struct pack_idx_option *opts)
1501 {
1502 const uint32_t *idx1, *idx2;
1503 uint32_t i;
1504
1505 /* The address of the 4-byte offset table */
1506 idx1 = (((const uint32_t *)p->index_data)
1507 + 2 /* 8-byte header */
1508 + 256 /* fan out */
1509 + 5 * p->num_objects /* 20-byte SHA-1 table */
1510 + p->num_objects /* CRC32 table */
1511 );
1512
1513 /* The address of the 8-byte offset table */
1514 idx2 = idx1 + p->num_objects;
1515
1516 for (i = 0; i < p->num_objects; i++) {
1517 uint32_t off = ntohl(idx1[i]);
1518 if (!(off & 0x80000000))
1519 continue;
1520 off = off & 0x7fffffff;
1521 check_pack_index_ptr(p, &idx2[off * 2]);
1522 if (idx2[off * 2])
1523 continue;
1524 /*
1525 * The real offset is ntohl(idx2[off * 2]) in high 4
1526 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1527 * octets. But idx2[off * 2] is Zero!!!
1528 */
1529 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1530 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1531 }
1532
1533 if (1 < opts->anomaly_nr)
1534 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1535 }
1536
1537 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1538 {
1539 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1540
1541 if (!p)
1542 die(_("Cannot open existing pack file '%s'"), pack_name);
1543 if (open_pack_index(p))
1544 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1545
1546 /* Read the attributes from the existing idx file */
1547 opts->version = p->index_version;
1548
1549 if (opts->version == 2)
1550 read_v2_anomalous_offsets(p, opts);
1551
1552 /*
1553 * Get rid of the idx file as we do not need it anymore.
1554 * NEEDSWORK: extract this bit from free_pack_by_name() in
1555 * sha1_file.c, perhaps? It shouldn't matter very much as we
1556 * know we haven't installed this pack (hence we never have
1557 * read anything from it).
1558 */
1559 close_pack_index(p);
1560 free(p);
1561 }
1562
1563 static void show_pack_info(int stat_only)
1564 {
1565 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1566 unsigned long *chain_histogram = NULL;
1567
1568 if (deepest_delta)
1569 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1570
1571 for (i = 0; i < nr_objects; i++) {
1572 struct object_entry *obj = &objects[i];
1573
1574 if (is_delta_type(obj->type))
1575 chain_histogram[obj_stat[i].delta_depth - 1]++;
1576 if (stat_only)
1577 continue;
1578 printf("%s %-6s %lu %lu %"PRIuMAX,
1579 sha1_to_hex(obj->idx.sha1),
1580 typename(obj->real_type), obj->size,
1581 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1582 (uintmax_t)obj->idx.offset);
1583 if (is_delta_type(obj->type)) {
1584 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1585 printf(" %u %s", obj_stat[i].delta_depth, sha1_to_hex(bobj->idx.sha1));
1586 }
1587 putchar('\n');
1588 }
1589
1590 if (baseobjects)
1591 printf_ln(Q_("non delta: %d object",
1592 "non delta: %d objects",
1593 baseobjects),
1594 baseobjects);
1595 for (i = 0; i < deepest_delta; i++) {
1596 if (!chain_histogram[i])
1597 continue;
1598 printf_ln(Q_("chain length = %d: %lu object",
1599 "chain length = %d: %lu objects",
1600 chain_histogram[i]),
1601 i + 1,
1602 chain_histogram[i]);
1603 }
1604 }
1605
1606 static const char *derive_filename(const char *pack_name, const char *suffix,
1607 struct strbuf *buf)
1608 {
1609 size_t len;
1610 if (!strip_suffix(pack_name, ".pack", &len))
1611 die(_("packfile name '%s' does not end with '.pack'"),
1612 pack_name);
1613 strbuf_add(buf, pack_name, len);
1614 strbuf_addstr(buf, suffix);
1615 return buf->buf;
1616 }
1617
1618 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1619 {
1620 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1621 const char *curr_index;
1622 const char *index_name = NULL, *pack_name = NULL;
1623 const char *keep_name = NULL, *keep_msg = NULL;
1624 struct strbuf index_name_buf = STRBUF_INIT,
1625 keep_name_buf = STRBUF_INIT;
1626 struct pack_idx_entry **idx_objects;
1627 struct pack_idx_option opts;
1628 unsigned char pack_sha1[20];
1629 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1630 int report_end_of_input = 0;
1631
1632 if (argc == 2 && !strcmp(argv[1], "-h"))
1633 usage(index_pack_usage);
1634
1635 check_replace_refs = 0;
1636 fsck_options.walk = mark_link;
1637
1638 reset_pack_idx_option(&opts);
1639 git_config(git_index_pack_config, &opts);
1640 if (prefix && chdir(prefix))
1641 die(_("Cannot come back to cwd"));
1642
1643 for (i = 1; i < argc; i++) {
1644 const char *arg = argv[i];
1645
1646 if (*arg == '-') {
1647 if (!strcmp(arg, "--stdin")) {
1648 from_stdin = 1;
1649 } else if (!strcmp(arg, "--fix-thin")) {
1650 fix_thin_pack = 1;
1651 } else if (!strcmp(arg, "--strict")) {
1652 strict = 1;
1653 do_fsck_object = 1;
1654 } else if (skip_prefix(arg, "--strict=", &arg)) {
1655 strict = 1;
1656 do_fsck_object = 1;
1657 fsck_set_msg_types(&fsck_options, arg);
1658 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1659 strict = 1;
1660 check_self_contained_and_connected = 1;
1661 } else if (!strcmp(arg, "--verify")) {
1662 verify = 1;
1663 } else if (!strcmp(arg, "--verify-stat")) {
1664 verify = 1;
1665 show_stat = 1;
1666 } else if (!strcmp(arg, "--verify-stat-only")) {
1667 verify = 1;
1668 show_stat = 1;
1669 stat_only = 1;
1670 } else if (!strcmp(arg, "--keep")) {
1671 keep_msg = "";
1672 } else if (starts_with(arg, "--keep=")) {
1673 keep_msg = arg + 7;
1674 } else if (starts_with(arg, "--threads=")) {
1675 char *end;
1676 nr_threads = strtoul(arg+10, &end, 0);
1677 if (!arg[10] || *end || nr_threads < 0)
1678 usage(index_pack_usage);
1679 #ifdef NO_PTHREADS
1680 if (nr_threads != 1)
1681 warning(_("no threads support, "
1682 "ignoring %s"), arg);
1683 nr_threads = 1;
1684 #endif
1685 } else if (starts_with(arg, "--pack_header=")) {
1686 struct pack_header *hdr;
1687 char *c;
1688
1689 hdr = (struct pack_header *)input_buffer;
1690 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1691 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1692 if (*c != ',')
1693 die(_("bad %s"), arg);
1694 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1695 if (*c)
1696 die(_("bad %s"), arg);
1697 input_len = sizeof(*hdr);
1698 } else if (!strcmp(arg, "-v")) {
1699 verbose = 1;
1700 } else if (!strcmp(arg, "--show-resolving-progress")) {
1701 show_resolving_progress = 1;
1702 } else if (!strcmp(arg, "--report-end-of-input")) {
1703 report_end_of_input = 1;
1704 } else if (!strcmp(arg, "-o")) {
1705 if (index_name || (i+1) >= argc)
1706 usage(index_pack_usage);
1707 index_name = argv[++i];
1708 } else if (starts_with(arg, "--index-version=")) {
1709 char *c;
1710 opts.version = strtoul(arg + 16, &c, 10);
1711 if (opts.version > 2)
1712 die(_("bad %s"), arg);
1713 if (*c == ',')
1714 opts.off32_limit = strtoul(c+1, &c, 0);
1715 if (*c || opts.off32_limit & 0x80000000)
1716 die(_("bad %s"), arg);
1717 } else
1718 usage(index_pack_usage);
1719 continue;
1720 }
1721
1722 if (pack_name)
1723 usage(index_pack_usage);
1724 pack_name = arg;
1725 }
1726
1727 if (!pack_name && !from_stdin)
1728 usage(index_pack_usage);
1729 if (fix_thin_pack && !from_stdin)
1730 die(_("--fix-thin cannot be used without --stdin"));
1731 if (!index_name && pack_name)
1732 index_name = derive_filename(pack_name, ".idx", &index_name_buf);
1733 if (keep_msg && !keep_name && pack_name)
1734 keep_name = derive_filename(pack_name, ".keep", &keep_name_buf);
1735
1736 if (verify) {
1737 if (!index_name)
1738 die(_("--verify with no packfile name given"));
1739 read_idx_option(&opts, index_name);
1740 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1741 }
1742 if (strict)
1743 opts.flags |= WRITE_IDX_STRICT;
1744
1745 #ifndef NO_PTHREADS
1746 if (!nr_threads) {
1747 nr_threads = online_cpus();
1748 /* An experiment showed that more threads does not mean faster */
1749 if (nr_threads > 3)
1750 nr_threads = 3;
1751 }
1752 #endif
1753
1754 curr_pack = open_pack_file(pack_name);
1755 parse_pack_header();
1756 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1757 if (show_stat)
1758 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1759 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1760 parse_pack_objects(pack_sha1);
1761 if (report_end_of_input)
1762 write_in_full(2, "\0", 1);
1763 resolve_deltas();
1764 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1765 free(ofs_deltas);
1766 free(ref_deltas);
1767 if (strict)
1768 foreign_nr = check_objects();
1769
1770 if (show_stat)
1771 show_pack_info(stat_only);
1772
1773 ALLOC_ARRAY(idx_objects, nr_objects);
1774 for (i = 0; i < nr_objects; i++)
1775 idx_objects[i] = &objects[i].idx;
1776 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1777 free(idx_objects);
1778
1779 if (!verify)
1780 final(pack_name, curr_pack,
1781 index_name, curr_index,
1782 keep_name, keep_msg,
1783 pack_sha1);
1784 else
1785 close(input_fd);
1786 free(objects);
1787 strbuf_release(&index_name_buf);
1788 strbuf_release(&keep_name_buf);
1789 if (pack_name == NULL)
1790 free((void *) curr_pack);
1791 if (index_name == NULL)
1792 free((void *) curr_index);
1793
1794 /*
1795 * Let the caller know this pack is not self contained
1796 */
1797 if (check_self_contained_and_connected && foreign_nr)
1798 return 1;
1799
1800 return 0;
1801 }
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