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pack-objects: refactor unpack-unreachable expiration check
[git.git] / builtin / index-pack.c
blob792c66ca5932638e11f2587f928a6b98c08e7854
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 int hdr_size;
22 enum object_type type;
23 enum object_type real_type;
24 unsigned delta_depth;
25 int base_object_no;
26 };
27
28 union delta_base {
29 unsigned char sha1[20];
30 off_t offset;
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 /*
53 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
54 * to memcmp() only the first 20 bytes.
55 */
56 #define UNION_BASE_SZ 20
57
58 #define FLAG_LINK (1u<<20)
59 #define FLAG_CHECKED (1u<<21)
60
61 struct delta_entry {
62 union delta_base base;
63 int obj_no;
64 };
65
66 static struct object_entry *objects;
67 static struct delta_entry *deltas;
68 static struct thread_local nothread_data;
69 static int nr_objects;
70 static int nr_deltas;
71 static int nr_resolved_deltas;
72 static int nr_threads;
73
74 static int from_stdin;
75 static int strict;
76 static int do_fsck_object;
77 static int verbose;
78 static int show_stat;
79 static int check_self_contained_and_connected;
80
81 static struct progress *progress;
82
83 /* We always read in 4kB chunks. */
84 static unsigned char input_buffer[4096];
85 static unsigned int input_offset, input_len;
86 static off_t consumed_bytes;
87 static unsigned deepest_delta;
88 static git_SHA_CTX input_ctx;
89 static uint32_t input_crc32;
90 static int input_fd, output_fd;
91 static const char *curr_pack;
92
93 #ifndef NO_PTHREADS
94
95 static struct thread_local *thread_data;
96 static int nr_dispatched;
97 static int threads_active;
98
99 static pthread_mutex_t read_mutex;
100 #define read_lock() lock_mutex(&read_mutex)
101 #define read_unlock() unlock_mutex(&read_mutex)
102
103 static pthread_mutex_t counter_mutex;
104 #define counter_lock() lock_mutex(&counter_mutex)
105 #define counter_unlock() unlock_mutex(&counter_mutex)
106
107 static pthread_mutex_t work_mutex;
108 #define work_lock() lock_mutex(&work_mutex)
109 #define work_unlock() unlock_mutex(&work_mutex)
110
111 static pthread_mutex_t deepest_delta_mutex;
112 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
113 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
114
115 static pthread_mutex_t type_cas_mutex;
116 #define type_cas_lock() lock_mutex(&type_cas_mutex)
117 #define type_cas_unlock() unlock_mutex(&type_cas_mutex)
118
119 static pthread_key_t key;
120
121 static inline void lock_mutex(pthread_mutex_t *mutex)
122 {
123 if (threads_active)
124 pthread_mutex_lock(mutex);
125 }
126
127 static inline void unlock_mutex(pthread_mutex_t *mutex)
128 {
129 if (threads_active)
130 pthread_mutex_unlock(mutex);
131 }
132
133 /*
134 * Mutex and conditional variable can't be statically-initialized on Windows.
135 */
136 static void init_thread(void)
137 {
138 int i;
139 init_recursive_mutex(&read_mutex);
140 pthread_mutex_init(&counter_mutex, NULL);
141 pthread_mutex_init(&work_mutex, NULL);
142 pthread_mutex_init(&type_cas_mutex, NULL);
143 if (show_stat)
144 pthread_mutex_init(&deepest_delta_mutex, NULL);
145 pthread_key_create(&key, NULL);
146 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
147 for (i = 0; i < nr_threads; i++) {
148 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
149 if (thread_data[i].pack_fd == -1)
150 die_errno(_("unable to open %s"), curr_pack);
151 }
152
153 threads_active = 1;
154 }
155
156 static void cleanup_thread(void)
157 {
158 int i;
159 if (!threads_active)
160 return;
161 threads_active = 0;
162 pthread_mutex_destroy(&read_mutex);
163 pthread_mutex_destroy(&counter_mutex);
164 pthread_mutex_destroy(&work_mutex);
165 pthread_mutex_destroy(&type_cas_mutex);
166 if (show_stat)
167 pthread_mutex_destroy(&deepest_delta_mutex);
168 for (i = 0; i < nr_threads; i++)
169 close(thread_data[i].pack_fd);
170 pthread_key_delete(key);
171 free(thread_data);
172 }
173
174 #else
175
176 #define read_lock()
177 #define read_unlock()
178
179 #define counter_lock()
180 #define counter_unlock()
181
182 #define work_lock()
183 #define work_unlock()
184
185 #define deepest_delta_lock()
186 #define deepest_delta_unlock()
187
188 #endif
189
190
191 static int mark_link(struct object *obj, int type, void *data)
192 {
193 if (!obj)
194 return -1;
195
196 if (type != OBJ_ANY && obj->type != type)
197 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
198
199 obj->flags |= FLAG_LINK;
200 return 0;
201 }
202
203 /* The content of each linked object must have been checked
204 or it must be already present in the object database */
205 static unsigned check_object(struct object *obj)
206 {
207 if (!obj)
208 return 0;
209
210 if (!(obj->flags & FLAG_LINK))
211 return 0;
212
213 if (!(obj->flags & FLAG_CHECKED)) {
214 unsigned long size;
215 int type = sha1_object_info(obj->sha1, &size);
216 if (type <= 0)
217 die(_("did not receive expected object %s"),
218 sha1_to_hex(obj->sha1));
219 if (type != obj->type)
220 die(_("object %s: expected type %s, found %s"),
221 sha1_to_hex(obj->sha1),
222 typename(obj->type), typename(type));
223 obj->flags |= FLAG_CHECKED;
224 return 1;
225 }
226
227 return 0;
228 }
229
230 static unsigned check_objects(void)
231 {
232 unsigned i, max, foreign_nr = 0;
233
234 max = get_max_object_index();
235 for (i = 0; i < max; i++)
236 foreign_nr += check_object(get_indexed_object(i));
237 return foreign_nr;
238 }
239
240
241 /* Discard current buffer used content. */
242 static void flush(void)
243 {
244 if (input_offset) {
245 if (output_fd >= 0)
246 write_or_die(output_fd, input_buffer, input_offset);
247 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
248 memmove(input_buffer, input_buffer + input_offset, input_len);
249 input_offset = 0;
250 }
251 }
252
253 /*
254 * Make sure at least "min" bytes are available in the buffer, and
255 * return the pointer to the buffer.
256 */
257 static void *fill(int min)
258 {
259 if (min <= input_len)
260 return input_buffer + input_offset;
261 if (min > sizeof(input_buffer))
262 die(Q_("cannot fill %d byte",
263 "cannot fill %d bytes",
264 min),
265 min);
266 flush();
267 do {
268 ssize_t ret = xread(input_fd, input_buffer + input_len,
269 sizeof(input_buffer) - input_len);
270 if (ret <= 0) {
271 if (!ret)
272 die(_("early EOF"));
273 die_errno(_("read error on input"));
274 }
275 input_len += ret;
276 if (from_stdin)
277 display_throughput(progress, consumed_bytes + input_len);
278 } while (input_len < min);
279 return input_buffer;
280 }
281
282 static void use(int bytes)
283 {
284 if (bytes > input_len)
285 die(_("used more bytes than were available"));
286 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
287 input_len -= bytes;
288 input_offset += bytes;
289
290 /* make sure off_t is sufficiently large not to wrap */
291 if (signed_add_overflows(consumed_bytes, bytes))
292 die(_("pack too large for current definition of off_t"));
293 consumed_bytes += bytes;
294 }
295
296 static const char *open_pack_file(const char *pack_name)
297 {
298 if (from_stdin) {
299 input_fd = 0;
300 if (!pack_name) {
301 static char tmp_file[PATH_MAX];
302 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
303 "pack/tmp_pack_XXXXXX");
304 pack_name = xstrdup(tmp_file);
305 } else
306 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
307 if (output_fd < 0)
308 die_errno(_("unable to create '%s'"), pack_name);
309 nothread_data.pack_fd = output_fd;
310 } else {
311 input_fd = open(pack_name, O_RDONLY);
312 if (input_fd < 0)
313 die_errno(_("cannot open packfile '%s'"), pack_name);
314 output_fd = -1;
315 nothread_data.pack_fd = input_fd;
316 }
317 git_SHA1_Init(&input_ctx);
318 return pack_name;
319 }
320
321 static void parse_pack_header(void)
322 {
323 struct pack_header *hdr = fill(sizeof(struct pack_header));
324
325 /* Header consistency check */
326 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
327 die(_("pack signature mismatch"));
328 if (!pack_version_ok(hdr->hdr_version))
329 die(_("pack version %"PRIu32" unsupported"),
330 ntohl(hdr->hdr_version));
331
332 nr_objects = ntohl(hdr->hdr_entries);
333 use(sizeof(struct pack_header));
334 }
335
336 static NORETURN void bad_object(unsigned long offset, const char *format,
337 ...) __attribute__((format (printf, 2, 3)));
338
339 static NORETURN void bad_object(unsigned long offset, const char *format, ...)
340 {
341 va_list params;
342 char buf[1024];
343
344 va_start(params, format);
345 vsnprintf(buf, sizeof(buf), format, params);
346 va_end(params);
347 die(_("pack has bad object at offset %lu: %s"), offset, buf);
348 }
349
350 static inline struct thread_local *get_thread_data(void)
351 {
352 #ifndef NO_PTHREADS
353 if (threads_active)
354 return pthread_getspecific(key);
355 assert(!threads_active &&
356 "This should only be reached when all threads are gone");
357 #endif
358 return &nothread_data;
359 }
360
361 #ifndef NO_PTHREADS
362 static void set_thread_data(struct thread_local *data)
363 {
364 if (threads_active)
365 pthread_setspecific(key, data);
366 }
367 #endif
368
369 static struct base_data *alloc_base_data(void)
370 {
371 struct base_data *base = xcalloc(1, sizeof(struct base_data));
372 base->ref_last = -1;
373 base->ofs_last = -1;
374 return base;
375 }
376
377 static void free_base_data(struct base_data *c)
378 {
379 if (c->data) {
380 free(c->data);
381 c->data = NULL;
382 get_thread_data()->base_cache_used -= c->size;
383 }
384 }
385
386 static void prune_base_data(struct base_data *retain)
387 {
388 struct base_data *b;
389 struct thread_local *data = get_thread_data();
390 for (b = data->base_cache;
391 data->base_cache_used > delta_base_cache_limit && b;
392 b = b->child) {
393 if (b->data && b != retain)
394 free_base_data(b);
395 }
396 }
397
398 static void link_base_data(struct base_data *base, struct base_data *c)
399 {
400 if (base)
401 base->child = c;
402 else
403 get_thread_data()->base_cache = c;
404
405 c->base = base;
406 c->child = NULL;
407 if (c->data)
408 get_thread_data()->base_cache_used += c->size;
409 prune_base_data(c);
410 }
411
412 static void unlink_base_data(struct base_data *c)
413 {
414 struct base_data *base = c->base;
415 if (base)
416 base->child = NULL;
417 else
418 get_thread_data()->base_cache = NULL;
419 free_base_data(c);
420 }
421
422 static int is_delta_type(enum object_type type)
423 {
424 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
425 }
426
427 static void *unpack_entry_data(unsigned long offset, unsigned long size,
428 enum object_type type, unsigned char *sha1)
429 {
430 static char fixed_buf[8192];
431 int status;
432 git_zstream stream;
433 void *buf;
434 git_SHA_CTX c;
435 char hdr[32];
436 int hdrlen;
437
438 if (!is_delta_type(type)) {
439 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
440 git_SHA1_Init(&c);
441 git_SHA1_Update(&c, hdr, hdrlen);
442 } else
443 sha1 = NULL;
444 if (type == OBJ_BLOB && size > big_file_threshold)
445 buf = fixed_buf;
446 else
447 buf = xmalloc(size);
448
449 memset(&stream, 0, sizeof(stream));
450 git_inflate_init(&stream);
451 stream.next_out = buf;
452 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
453
454 do {
455 unsigned char *last_out = stream.next_out;
456 stream.next_in = fill(1);
457 stream.avail_in = input_len;
458 status = git_inflate(&stream, 0);
459 use(input_len - stream.avail_in);
460 if (sha1)
461 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
462 if (buf == fixed_buf) {
463 stream.next_out = buf;
464 stream.avail_out = sizeof(fixed_buf);
465 }
466 } while (status == Z_OK);
467 if (stream.total_out != size || status != Z_STREAM_END)
468 bad_object(offset, _("inflate returned %d"), status);
469 git_inflate_end(&stream);
470 if (sha1)
471 git_SHA1_Final(sha1, &c);
472 return buf == fixed_buf ? NULL : buf;
473 }
474
475 static void *unpack_raw_entry(struct object_entry *obj,
476 union delta_base *delta_base,
477 unsigned char *sha1)
478 {
479 unsigned char *p;
480 unsigned long size, c;
481 off_t base_offset;
482 unsigned shift;
483 void *data;
484
485 obj->idx.offset = consumed_bytes;
486 input_crc32 = crc32(0, NULL, 0);
487
488 p = fill(1);
489 c = *p;
490 use(1);
491 obj->type = (c >> 4) & 7;
492 size = (c & 15);
493 shift = 4;
494 while (c & 0x80) {
495 p = fill(1);
496 c = *p;
497 use(1);
498 size += (c & 0x7f) << shift;
499 shift += 7;
500 }
501 obj->size = size;
502
503 switch (obj->type) {
504 case OBJ_REF_DELTA:
505 hashcpy(delta_base->sha1, fill(20));
506 use(20);
507 break;
508 case OBJ_OFS_DELTA:
509 memset(delta_base, 0, sizeof(*delta_base));
510 p = fill(1);
511 c = *p;
512 use(1);
513 base_offset = c & 127;
514 while (c & 128) {
515 base_offset += 1;
516 if (!base_offset || MSB(base_offset, 7))
517 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
518 p = fill(1);
519 c = *p;
520 use(1);
521 base_offset = (base_offset << 7) + (c & 127);
522 }
523 delta_base->offset = obj->idx.offset - base_offset;
524 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
525 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
526 break;
527 case OBJ_COMMIT:
528 case OBJ_TREE:
529 case OBJ_BLOB:
530 case OBJ_TAG:
531 break;
532 default:
533 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
534 }
535 obj->hdr_size = consumed_bytes - obj->idx.offset;
536
537 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
538 obj->idx.crc32 = input_crc32;
539 return data;
540 }
541
542 static void *unpack_data(struct object_entry *obj,
543 int (*consume)(const unsigned char *, unsigned long, void *),
544 void *cb_data)
545 {
546 off_t from = obj[0].idx.offset + obj[0].hdr_size;
547 unsigned long len = obj[1].idx.offset - from;
548 unsigned char *data, *inbuf;
549 git_zstream stream;
550 int status;
551
552 data = xmalloc(consume ? 64*1024 : obj->size);
553 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
554
555 memset(&stream, 0, sizeof(stream));
556 git_inflate_init(&stream);
557 stream.next_out = data;
558 stream.avail_out = consume ? 64*1024 : obj->size;
559
560 do {
561 ssize_t n = (len < 64*1024) ? len : 64*1024;
562 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
563 if (n < 0)
564 die_errno(_("cannot pread pack file"));
565 if (!n)
566 die(Q_("premature end of pack file, %lu byte missing",
567 "premature end of pack file, %lu bytes missing",
568 len),
569 len);
570 from += n;
571 len -= n;
572 stream.next_in = inbuf;
573 stream.avail_in = n;
574 if (!consume)
575 status = git_inflate(&stream, 0);
576 else {
577 do {
578 status = git_inflate(&stream, 0);
579 if (consume(data, stream.next_out - data, cb_data)) {
580 free(inbuf);
581 free(data);
582 return NULL;
583 }
584 stream.next_out = data;
585 stream.avail_out = 64*1024;
586 } while (status == Z_OK && stream.avail_in);
587 }
588 } while (len && status == Z_OK && !stream.avail_in);
589
590 /* This has been inflated OK when first encountered, so... */
591 if (status != Z_STREAM_END || stream.total_out != obj->size)
592 die(_("serious inflate inconsistency"));
593
594 git_inflate_end(&stream);
595 free(inbuf);
596 if (consume) {
597 free(data);
598 data = NULL;
599 }
600 return data;
601 }
602
603 static void *get_data_from_pack(struct object_entry *obj)
604 {
605 return unpack_data(obj, NULL, NULL);
606 }
607
608 static int compare_delta_bases(const union delta_base *base1,
609 const union delta_base *base2,
610 enum object_type type1,
611 enum object_type type2)
612 {
613 int cmp = type1 - type2;
614 if (cmp)
615 return cmp;
616 return memcmp(base1, base2, UNION_BASE_SZ);
617 }
618
619 static int find_delta(const union delta_base *base, enum object_type type)
620 {
621 int first = 0, last = nr_deltas;
622
623 while (first < last) {
624 int next = (first + last) / 2;
625 struct delta_entry *delta = &deltas[next];
626 int cmp;
627
628 cmp = compare_delta_bases(base, &delta->base,
629 type, objects[delta->obj_no].type);
630 if (!cmp)
631 return next;
632 if (cmp < 0) {
633 last = next;
634 continue;
635 }
636 first = next+1;
637 }
638 return -first-1;
639 }
640
641 static void find_delta_children(const union delta_base *base,
642 int *first_index, int *last_index,
643 enum object_type type)
644 {
645 int first = find_delta(base, type);
646 int last = first;
647 int end = nr_deltas - 1;
648
649 if (first < 0) {
650 *first_index = 0;
651 *last_index = -1;
652 return;
653 }
654 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
655 --first;
656 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
657 ++last;
658 *first_index = first;
659 *last_index = last;
660 }
661
662 struct compare_data {
663 struct object_entry *entry;
664 struct git_istream *st;
665 unsigned char *buf;
666 unsigned long buf_size;
667 };
668
669 static int compare_objects(const unsigned char *buf, unsigned long size,
670 void *cb_data)
671 {
672 struct compare_data *data = cb_data;
673
674 if (data->buf_size < size) {
675 free(data->buf);
676 data->buf = xmalloc(size);
677 data->buf_size = size;
678 }
679
680 while (size) {
681 ssize_t len = read_istream(data->st, data->buf, size);
682 if (len == 0)
683 die(_("SHA1 COLLISION FOUND WITH %s !"),
684 sha1_to_hex(data->entry->idx.sha1));
685 if (len < 0)
686 die(_("unable to read %s"),
687 sha1_to_hex(data->entry->idx.sha1));
688 if (memcmp(buf, data->buf, len))
689 die(_("SHA1 COLLISION FOUND WITH %s !"),
690 sha1_to_hex(data->entry->idx.sha1));
691 size -= len;
692 buf += len;
693 }
694 return 0;
695 }
696
697 static int check_collison(struct object_entry *entry)
698 {
699 struct compare_data data;
700 enum object_type type;
701 unsigned long size;
702
703 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
704 return -1;
705
706 memset(&data, 0, sizeof(data));
707 data.entry = entry;
708 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
709 if (!data.st)
710 return -1;
711 if (size != entry->size || type != entry->type)
712 die(_("SHA1 COLLISION FOUND WITH %s !"),
713 sha1_to_hex(entry->idx.sha1));
714 unpack_data(entry, compare_objects, &data);
715 close_istream(data.st);
716 free(data.buf);
717 return 0;
718 }
719
720 static void sha1_object(const void *data, struct object_entry *obj_entry,
721 unsigned long size, enum object_type type,
722 const unsigned char *sha1)
723 {
724 void *new_data = NULL;
725 int collision_test_needed;
726
727 assert(data || obj_entry);
728
729 read_lock();
730 collision_test_needed = has_sha1_file(sha1);
731 read_unlock();
732
733 if (collision_test_needed && !data) {
734 read_lock();
735 if (!check_collison(obj_entry))
736 collision_test_needed = 0;
737 read_unlock();
738 }
739 if (collision_test_needed) {
740 void *has_data;
741 enum object_type has_type;
742 unsigned long has_size;
743 read_lock();
744 has_type = sha1_object_info(sha1, &has_size);
745 if (has_type != type || has_size != size)
746 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
747 has_data = read_sha1_file(sha1, &has_type, &has_size);
748 read_unlock();
749 if (!data)
750 data = new_data = get_data_from_pack(obj_entry);
751 if (!has_data)
752 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
753 if (size != has_size || type != has_type ||
754 memcmp(data, has_data, size) != 0)
755 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
756 free(has_data);
757 }
758
759 if (strict) {
760 read_lock();
761 if (type == OBJ_BLOB) {
762 struct blob *blob = lookup_blob(sha1);
763 if (blob)
764 blob->object.flags |= FLAG_CHECKED;
765 else
766 die(_("invalid blob object %s"), sha1_to_hex(sha1));
767 } else {
768 struct object *obj;
769 int eaten;
770 void *buf = (void *) data;
771
772 assert(data && "data can only be NULL for large _blobs_");
773
774 /*
775 * we do not need to free the memory here, as the
776 * buf is deleted by the caller.
777 */
778 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
779 if (!obj)
780 die(_("invalid %s"), typename(type));
781 if (do_fsck_object &&
782 fsck_object(obj, buf, size, 1,
783 fsck_error_function))
784 die(_("Error in object"));
785 if (fsck_walk(obj, mark_link, NULL))
786 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
787
788 if (obj->type == OBJ_TREE) {
789 struct tree *item = (struct tree *) obj;
790 item->buffer = NULL;
791 obj->parsed = 0;
792 }
793 if (obj->type == OBJ_COMMIT) {
794 struct commit *commit = (struct commit *) obj;
795 if (detach_commit_buffer(commit, NULL) != data)
796 die("BUG: parse_object_buffer transmogrified our buffer");
797 }
798 obj->flags |= FLAG_CHECKED;
799 }
800 read_unlock();
801 }
802
803 free(new_data);
804 }
805
806 /*
807 * This function is part of find_unresolved_deltas(). There are two
808 * walkers going in the opposite ways.
809 *
810 * The first one in find_unresolved_deltas() traverses down from
811 * parent node to children, deflating nodes along the way. However,
812 * memory for deflated nodes is limited by delta_base_cache_limit, so
813 * at some point parent node's deflated content may be freed.
814 *
815 * The second walker is this function, which goes from current node up
816 * to top parent if necessary to deflate the node. In normal
817 * situation, its parent node would be already deflated, so it just
818 * needs to apply delta.
819 *
820 * In the worst case scenario, parent node is no longer deflated because
821 * we're running out of delta_base_cache_limit; we need to re-deflate
822 * parents, possibly up to the top base.
823 *
824 * All deflated objects here are subject to be freed if we exceed
825 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
826 * just need to make sure the last node is not freed.
827 */
828 static void *get_base_data(struct base_data *c)
829 {
830 if (!c->data) {
831 struct object_entry *obj = c->obj;
832 struct base_data **delta = NULL;
833 int delta_nr = 0, delta_alloc = 0;
834
835 while (is_delta_type(c->obj->type) && !c->data) {
836 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
837 delta[delta_nr++] = c;
838 c = c->base;
839 }
840 if (!delta_nr) {
841 c->data = get_data_from_pack(obj);
842 c->size = obj->size;
843 get_thread_data()->base_cache_used += c->size;
844 prune_base_data(c);
845 }
846 for (; delta_nr > 0; delta_nr--) {
847 void *base, *raw;
848 c = delta[delta_nr - 1];
849 obj = c->obj;
850 base = get_base_data(c->base);
851 raw = get_data_from_pack(obj);
852 c->data = patch_delta(
853 base, c->base->size,
854 raw, obj->size,
855 &c->size);
856 free(raw);
857 if (!c->data)
858 bad_object(obj->idx.offset, _("failed to apply delta"));
859 get_thread_data()->base_cache_used += c->size;
860 prune_base_data(c);
861 }
862 free(delta);
863 }
864 return c->data;
865 }
866
867 static void resolve_delta(struct object_entry *delta_obj,
868 struct base_data *base, struct base_data *result)
869 {
870 void *base_data, *delta_data;
871
872 if (show_stat) {
873 delta_obj->delta_depth = base->obj->delta_depth + 1;
874 deepest_delta_lock();
875 if (deepest_delta < delta_obj->delta_depth)
876 deepest_delta = delta_obj->delta_depth;
877 deepest_delta_unlock();
878 }
879 delta_obj->base_object_no = base->obj - objects;
880 delta_data = get_data_from_pack(delta_obj);
881 base_data = get_base_data(base);
882 result->obj = delta_obj;
883 result->data = patch_delta(base_data, base->size,
884 delta_data, delta_obj->size, &result->size);
885 free(delta_data);
886 if (!result->data)
887 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
888 hash_sha1_file(result->data, result->size,
889 typename(delta_obj->real_type), delta_obj->idx.sha1);
890 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
891 delta_obj->idx.sha1);
892 counter_lock();
893 nr_resolved_deltas++;
894 counter_unlock();
895 }
896
897 /*
898 * Standard boolean compare-and-swap: atomically check whether "*type" is
899 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
900 * and return false.
901 */
902 static int compare_and_swap_type(enum object_type *type,
903 enum object_type want,
904 enum object_type set)
905 {
906 enum object_type old;
907
908 type_cas_lock();
909 old = *type;
910 if (old == want)
911 *type = set;
912 type_cas_unlock();
913
914 return old == want;
915 }
916
917 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
918 struct base_data *prev_base)
919 {
920 if (base->ref_last == -1 && base->ofs_last == -1) {
921 union delta_base base_spec;
922
923 hashcpy(base_spec.sha1, base->obj->idx.sha1);
924 find_delta_children(&base_spec,
925 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
926
927 memset(&base_spec, 0, sizeof(base_spec));
928 base_spec.offset = base->obj->idx.offset;
929 find_delta_children(&base_spec,
930 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
931
932 if (base->ref_last == -1 && base->ofs_last == -1) {
933 free(base->data);
934 return NULL;
935 }
936
937 link_base_data(prev_base, base);
938 }
939
940 if (base->ref_first <= base->ref_last) {
941 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
942 struct base_data *result = alloc_base_data();
943
944 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
945 base->obj->real_type))
946 die("BUG: child->real_type != OBJ_REF_DELTA");
947
948 resolve_delta(child, base, result);
949 if (base->ref_first == base->ref_last && base->ofs_last == -1)
950 free_base_data(base);
951
952 base->ref_first++;
953 return result;
954 }
955
956 if (base->ofs_first <= base->ofs_last) {
957 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
958 struct base_data *result = alloc_base_data();
959
960 assert(child->real_type == OBJ_OFS_DELTA);
961 child->real_type = base->obj->real_type;
962 resolve_delta(child, base, result);
963 if (base->ofs_first == base->ofs_last)
964 free_base_data(base);
965
966 base->ofs_first++;
967 return result;
968 }
969
970 unlink_base_data(base);
971 return NULL;
972 }
973
974 static void find_unresolved_deltas(struct base_data *base)
975 {
976 struct base_data *new_base, *prev_base = NULL;
977 for (;;) {
978 new_base = find_unresolved_deltas_1(base, prev_base);
979
980 if (new_base) {
981 prev_base = base;
982 base = new_base;
983 } else {
984 free(base);
985 base = prev_base;
986 if (!base)
987 return;
988 prev_base = base->base;
989 }
990 }
991 }
992
993 static int compare_delta_entry(const void *a, const void *b)
994 {
995 const struct delta_entry *delta_a = a;
996 const struct delta_entry *delta_b = b;
997
998 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
999 return compare_delta_bases(&delta_a->base, &delta_b->base,
1000 objects[delta_a->obj_no].type,
1001 objects[delta_b->obj_no].type);
1002 }
1003
1004 static void resolve_base(struct object_entry *obj)
1005 {
1006 struct base_data *base_obj = alloc_base_data();
1007 base_obj->obj = obj;
1008 base_obj->data = NULL;
1009 find_unresolved_deltas(base_obj);
1010 }
1011
1012 #ifndef NO_PTHREADS
1013 static void *threaded_second_pass(void *data)
1014 {
1015 set_thread_data(data);
1016 for (;;) {
1017 int i;
1018 counter_lock();
1019 display_progress(progress, nr_resolved_deltas);
1020 counter_unlock();
1021 work_lock();
1022 while (nr_dispatched < nr_objects &&
1023 is_delta_type(objects[nr_dispatched].type))
1024 nr_dispatched++;
1025 if (nr_dispatched >= nr_objects) {
1026 work_unlock();
1027 break;
1028 }
1029 i = nr_dispatched++;
1030 work_unlock();
1031
1032 resolve_base(&objects[i]);
1033 }
1034 return NULL;
1035 }
1036 #endif
1037
1038 /*
1039 * First pass:
1040 * - find locations of all objects;
1041 * - calculate SHA1 of all non-delta objects;
1042 * - remember base (SHA1 or offset) for all deltas.
1043 */
1044 static void parse_pack_objects(unsigned char *sha1)
1045 {
1046 int i, nr_delays = 0;
1047 struct delta_entry *delta = deltas;
1048 struct stat st;
1049
1050 if (verbose)
1051 progress = start_progress(
1052 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1053 nr_objects);
1054 for (i = 0; i < nr_objects; i++) {
1055 struct object_entry *obj = &objects[i];
1056 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
1057 obj->real_type = obj->type;
1058 if (is_delta_type(obj->type)) {
1059 nr_deltas++;
1060 delta->obj_no = i;
1061 delta++;
1062 } else if (!data) {
1063 /* large blobs, check later */
1064 obj->real_type = OBJ_BAD;
1065 nr_delays++;
1066 } else
1067 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1068 free(data);
1069 display_progress(progress, i+1);
1070 }
1071 objects[i].idx.offset = consumed_bytes;
1072 stop_progress(&progress);
1073
1074 /* Check pack integrity */
1075 flush();
1076 git_SHA1_Final(sha1, &input_ctx);
1077 if (hashcmp(fill(20), sha1))
1078 die(_("pack is corrupted (SHA1 mismatch)"));
1079 use(20);
1080
1081 /* If input_fd is a file, we should have reached its end now. */
1082 if (fstat(input_fd, &st))
1083 die_errno(_("cannot fstat packfile"));
1084 if (S_ISREG(st.st_mode) &&
1085 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1086 die(_("pack has junk at the end"));
1087
1088 for (i = 0; i < nr_objects; i++) {
1089 struct object_entry *obj = &objects[i];
1090 if (obj->real_type != OBJ_BAD)
1091 continue;
1092 obj->real_type = obj->type;
1093 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1094 nr_delays--;
1095 }
1096 if (nr_delays)
1097 die(_("confusion beyond insanity in parse_pack_objects()"));
1098 }
1099
1100 /*
1101 * Second pass:
1102 * - for all non-delta objects, look if it is used as a base for
1103 * deltas;
1104 * - if used as a base, uncompress the object and apply all deltas,
1105 * recursively checking if the resulting object is used as a base
1106 * for some more deltas.
1107 */
1108 static void resolve_deltas(void)
1109 {
1110 int i;
1111
1112 if (!nr_deltas)
1113 return;
1114
1115 /* Sort deltas by base SHA1/offset for fast searching */
1116 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1117 compare_delta_entry);
1118
1119 if (verbose)
1120 progress = start_progress(_("Resolving deltas"), nr_deltas);
1121
1122 #ifndef NO_PTHREADS
1123 nr_dispatched = 0;
1124 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1125 init_thread();
1126 for (i = 0; i < nr_threads; i++) {
1127 int ret = pthread_create(&thread_data[i].thread, NULL,
1128 threaded_second_pass, thread_data + i);
1129 if (ret)
1130 die(_("unable to create thread: %s"),
1131 strerror(ret));
1132 }
1133 for (i = 0; i < nr_threads; i++)
1134 pthread_join(thread_data[i].thread, NULL);
1135 cleanup_thread();
1136 return;
1137 }
1138 #endif
1139
1140 for (i = 0; i < nr_objects; i++) {
1141 struct object_entry *obj = &objects[i];
1142
1143 if (is_delta_type(obj->type))
1144 continue;
1145 resolve_base(obj);
1146 display_progress(progress, nr_resolved_deltas);
1147 }
1148 }
1149
1150 /*
1151 * Third pass:
1152 * - append objects to convert thin pack to full pack if required
1153 * - write the final 20-byte SHA-1
1154 */
1155 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1156 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1157 {
1158 if (nr_deltas == nr_resolved_deltas) {
1159 stop_progress(&progress);
1160 /* Flush remaining pack final 20-byte SHA1. */
1161 flush();
1162 return;
1163 }
1164
1165 if (fix_thin_pack) {
1166 struct sha1file *f;
1167 unsigned char read_sha1[20], tail_sha1[20];
1168 struct strbuf msg = STRBUF_INIT;
1169 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1170 int nr_objects_initial = nr_objects;
1171 if (nr_unresolved <= 0)
1172 die(_("confusion beyond insanity"));
1173 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1174 memset(objects + nr_objects + 1, 0,
1175 nr_unresolved * sizeof(*objects));
1176 f = sha1fd(output_fd, curr_pack);
1177 fix_unresolved_deltas(f, nr_unresolved);
1178 strbuf_addf(&msg, _("completed with %d local objects"),
1179 nr_objects - nr_objects_initial);
1180 stop_progress_msg(&progress, msg.buf);
1181 strbuf_release(&msg);
1182 sha1close(f, tail_sha1, 0);
1183 hashcpy(read_sha1, pack_sha1);
1184 fixup_pack_header_footer(output_fd, pack_sha1,
1185 curr_pack, nr_objects,
1186 read_sha1, consumed_bytes-20);
1187 if (hashcmp(read_sha1, tail_sha1) != 0)
1188 die(_("Unexpected tail checksum for %s "
1189 "(disk corruption?)"), curr_pack);
1190 }
1191 if (nr_deltas != nr_resolved_deltas)
1192 die(Q_("pack has %d unresolved delta",
1193 "pack has %d unresolved deltas",
1194 nr_deltas - nr_resolved_deltas),
1195 nr_deltas - nr_resolved_deltas);
1196 }
1197
1198 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1199 {
1200 git_zstream stream;
1201 int status;
1202 unsigned char outbuf[4096];
1203
1204 memset(&stream, 0, sizeof(stream));
1205 git_deflate_init(&stream, zlib_compression_level);
1206 stream.next_in = in;
1207 stream.avail_in = size;
1208
1209 do {
1210 stream.next_out = outbuf;
1211 stream.avail_out = sizeof(outbuf);
1212 status = git_deflate(&stream, Z_FINISH);
1213 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1214 } while (status == Z_OK);
1215
1216 if (status != Z_STREAM_END)
1217 die(_("unable to deflate appended object (%d)"), status);
1218 size = stream.total_out;
1219 git_deflate_end(&stream);
1220 return size;
1221 }
1222
1223 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1224 const unsigned char *sha1, void *buf,
1225 unsigned long size, enum object_type type)
1226 {
1227 struct object_entry *obj = &objects[nr_objects++];
1228 unsigned char header[10];
1229 unsigned long s = size;
1230 int n = 0;
1231 unsigned char c = (type << 4) | (s & 15);
1232 s >>= 4;
1233 while (s) {
1234 header[n++] = c | 0x80;
1235 c = s & 0x7f;
1236 s >>= 7;
1237 }
1238 header[n++] = c;
1239 crc32_begin(f);
1240 sha1write(f, header, n);
1241 obj[0].size = size;
1242 obj[0].hdr_size = n;
1243 obj[0].type = type;
1244 obj[0].real_type = type;
1245 obj[1].idx.offset = obj[0].idx.offset + n;
1246 obj[1].idx.offset += write_compressed(f, buf, size);
1247 obj[0].idx.crc32 = crc32_end(f);
1248 sha1flush(f);
1249 hashcpy(obj->idx.sha1, sha1);
1250 return obj;
1251 }
1252
1253 static int delta_pos_compare(const void *_a, const void *_b)
1254 {
1255 struct delta_entry *a = *(struct delta_entry **)_a;
1256 struct delta_entry *b = *(struct delta_entry **)_b;
1257 return a->obj_no - b->obj_no;
1258 }
1259
1260 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1261 {
1262 struct delta_entry **sorted_by_pos;
1263 int i, n = 0;
1264
1265 /*
1266 * Since many unresolved deltas may well be themselves base objects
1267 * for more unresolved deltas, we really want to include the
1268 * smallest number of base objects that would cover as much delta
1269 * as possible by picking the
1270 * trunc deltas first, allowing for other deltas to resolve without
1271 * additional base objects. Since most base objects are to be found
1272 * before deltas depending on them, a good heuristic is to start
1273 * resolving deltas in the same order as their position in the pack.
1274 */
1275 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1276 for (i = 0; i < nr_deltas; i++) {
1277 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1278 continue;
1279 sorted_by_pos[n++] = &deltas[i];
1280 }
1281 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1282
1283 for (i = 0; i < n; i++) {
1284 struct delta_entry *d = sorted_by_pos[i];
1285 enum object_type type;
1286 struct base_data *base_obj = alloc_base_data();
1287
1288 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1289 continue;
1290 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1291 if (!base_obj->data)
1292 continue;
1293
1294 if (check_sha1_signature(d->base.sha1, base_obj->data,
1295 base_obj->size, typename(type)))
1296 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1297 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1298 base_obj->data, base_obj->size, type);
1299 find_unresolved_deltas(base_obj);
1300 display_progress(progress, nr_resolved_deltas);
1301 }
1302 free(sorted_by_pos);
1303 }
1304
1305 static void final(const char *final_pack_name, const char *curr_pack_name,
1306 const char *final_index_name, const char *curr_index_name,
1307 const char *keep_name, const char *keep_msg,
1308 unsigned char *sha1)
1309 {
1310 const char *report = "pack";
1311 char name[PATH_MAX];
1312 int err;
1313
1314 if (!from_stdin) {
1315 close(input_fd);
1316 } else {
1317 fsync_or_die(output_fd, curr_pack_name);
1318 err = close(output_fd);
1319 if (err)
1320 die_errno(_("error while closing pack file"));
1321 }
1322
1323 if (keep_msg) {
1324 int keep_fd, keep_msg_len = strlen(keep_msg);
1325
1326 if (!keep_name)
1327 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1328 else
1329 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1330
1331 if (keep_fd < 0) {
1332 if (errno != EEXIST)
1333 die_errno(_("cannot write keep file '%s'"),
1334 keep_name ? keep_name : name);
1335 } else {
1336 if (keep_msg_len > 0) {
1337 write_or_die(keep_fd, keep_msg, keep_msg_len);
1338 write_or_die(keep_fd, "\n", 1);
1339 }
1340 if (close(keep_fd) != 0)
1341 die_errno(_("cannot close written keep file '%s'"),
1342 keep_name ? keep_name : name);
1343 report = "keep";
1344 }
1345 }
1346
1347 if (final_pack_name != curr_pack_name) {
1348 if (!final_pack_name) {
1349 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1350 get_object_directory(), sha1_to_hex(sha1));
1351 final_pack_name = name;
1352 }
1353 if (move_temp_to_file(curr_pack_name, final_pack_name))
1354 die(_("cannot store pack file"));
1355 } else if (from_stdin)
1356 chmod(final_pack_name, 0444);
1357
1358 if (final_index_name != curr_index_name) {
1359 if (!final_index_name) {
1360 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1361 get_object_directory(), sha1_to_hex(sha1));
1362 final_index_name = name;
1363 }
1364 if (move_temp_to_file(curr_index_name, final_index_name))
1365 die(_("cannot store index file"));
1366 } else
1367 chmod(final_index_name, 0444);
1368
1369 if (!from_stdin) {
1370 printf("%s\n", sha1_to_hex(sha1));
1371 } else {
1372 char buf[48];
1373 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1374 report, sha1_to_hex(sha1));
1375 write_or_die(1, buf, len);
1376
1377 /*
1378 * Let's just mimic git-unpack-objects here and write
1379 * the last part of the input buffer to stdout.
1380 */
1381 while (input_len) {
1382 err = xwrite(1, input_buffer + input_offset, input_len);
1383 if (err <= 0)
1384 break;
1385 input_len -= err;
1386 input_offset += err;
1387 }
1388 }
1389 }
1390
1391 static int git_index_pack_config(const char *k, const char *v, void *cb)
1392 {
1393 struct pack_idx_option *opts = cb;
1394
1395 if (!strcmp(k, "pack.indexversion")) {
1396 opts->version = git_config_int(k, v);
1397 if (opts->version > 2)
1398 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1399 return 0;
1400 }
1401 if (!strcmp(k, "pack.threads")) {
1402 nr_threads = git_config_int(k, v);
1403 if (nr_threads < 0)
1404 die(_("invalid number of threads specified (%d)"),
1405 nr_threads);
1406 #ifdef NO_PTHREADS
1407 if (nr_threads != 1)
1408 warning(_("no threads support, ignoring %s"), k);
1409 nr_threads = 1;
1410 #endif
1411 return 0;
1412 }
1413 return git_default_config(k, v, cb);
1414 }
1415
1416 static int cmp_uint32(const void *a_, const void *b_)
1417 {
1418 uint32_t a = *((uint32_t *)a_);
1419 uint32_t b = *((uint32_t *)b_);
1420
1421 return (a < b) ? -1 : (a != b);
1422 }
1423
1424 static void read_v2_anomalous_offsets(struct packed_git *p,
1425 struct pack_idx_option *opts)
1426 {
1427 const uint32_t *idx1, *idx2;
1428 uint32_t i;
1429
1430 /* The address of the 4-byte offset table */
1431 idx1 = (((const uint32_t *)p->index_data)
1432 + 2 /* 8-byte header */
1433 + 256 /* fan out */
1434 + 5 * p->num_objects /* 20-byte SHA-1 table */
1435 + p->num_objects /* CRC32 table */
1436 );
1437
1438 /* The address of the 8-byte offset table */
1439 idx2 = idx1 + p->num_objects;
1440
1441 for (i = 0; i < p->num_objects; i++) {
1442 uint32_t off = ntohl(idx1[i]);
1443 if (!(off & 0x80000000))
1444 continue;
1445 off = off & 0x7fffffff;
1446 if (idx2[off * 2])
1447 continue;
1448 /*
1449 * The real offset is ntohl(idx2[off * 2]) in high 4
1450 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1451 * octets. But idx2[off * 2] is Zero!!!
1452 */
1453 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1454 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1455 }
1456
1457 if (1 < opts->anomaly_nr)
1458 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1459 }
1460
1461 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1462 {
1463 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1464
1465 if (!p)
1466 die(_("Cannot open existing pack file '%s'"), pack_name);
1467 if (open_pack_index(p))
1468 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1469
1470 /* Read the attributes from the existing idx file */
1471 opts->version = p->index_version;
1472
1473 if (opts->version == 2)
1474 read_v2_anomalous_offsets(p, opts);
1475
1476 /*
1477 * Get rid of the idx file as we do not need it anymore.
1478 * NEEDSWORK: extract this bit from free_pack_by_name() in
1479 * sha1_file.c, perhaps? It shouldn't matter very much as we
1480 * know we haven't installed this pack (hence we never have
1481 * read anything from it).
1482 */
1483 close_pack_index(p);
1484 free(p);
1485 }
1486
1487 static void show_pack_info(int stat_only)
1488 {
1489 int i, baseobjects = nr_objects - nr_deltas;
1490 unsigned long *chain_histogram = NULL;
1491
1492 if (deepest_delta)
1493 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1494
1495 for (i = 0; i < nr_objects; i++) {
1496 struct object_entry *obj = &objects[i];
1497
1498 if (is_delta_type(obj->type))
1499 chain_histogram[obj->delta_depth - 1]++;
1500 if (stat_only)
1501 continue;
1502 printf("%s %-6s %lu %lu %"PRIuMAX,
1503 sha1_to_hex(obj->idx.sha1),
1504 typename(obj->real_type), obj->size,
1505 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1506 (uintmax_t)obj->idx.offset);
1507 if (is_delta_type(obj->type)) {
1508 struct object_entry *bobj = &objects[obj->base_object_no];
1509 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1510 }
1511 putchar('\n');
1512 }
1513
1514 if (baseobjects)
1515 printf_ln(Q_("non delta: %d object",
1516 "non delta: %d objects",
1517 baseobjects),
1518 baseobjects);
1519 for (i = 0; i < deepest_delta; i++) {
1520 if (!chain_histogram[i])
1521 continue;
1522 printf_ln(Q_("chain length = %d: %lu object",
1523 "chain length = %d: %lu objects",
1524 chain_histogram[i]),
1525 i + 1,
1526 chain_histogram[i]);
1527 }
1528 }
1529
1530 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1531 {
1532 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1533 const char *curr_index;
1534 const char *index_name = NULL, *pack_name = NULL;
1535 const char *keep_name = NULL, *keep_msg = NULL;
1536 struct strbuf index_name_buf = STRBUF_INIT,
1537 keep_name_buf = STRBUF_INIT;
1538 struct pack_idx_entry **idx_objects;
1539 struct pack_idx_option opts;
1540 unsigned char pack_sha1[20];
1541 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1542
1543 if (argc == 2 && !strcmp(argv[1], "-h"))
1544 usage(index_pack_usage);
1545
1546 check_replace_refs = 0;
1547
1548 reset_pack_idx_option(&opts);
1549 git_config(git_index_pack_config, &opts);
1550 if (prefix && chdir(prefix))
1551 die(_("Cannot come back to cwd"));
1552
1553 for (i = 1; i < argc; i++) {
1554 const char *arg = argv[i];
1555
1556 if (*arg == '-') {
1557 if (!strcmp(arg, "--stdin")) {
1558 from_stdin = 1;
1559 } else if (!strcmp(arg, "--fix-thin")) {
1560 fix_thin_pack = 1;
1561 } else if (!strcmp(arg, "--strict")) {
1562 strict = 1;
1563 do_fsck_object = 1;
1564 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1565 strict = 1;
1566 check_self_contained_and_connected = 1;
1567 } else if (!strcmp(arg, "--verify")) {
1568 verify = 1;
1569 } else if (!strcmp(arg, "--verify-stat")) {
1570 verify = 1;
1571 show_stat = 1;
1572 } else if (!strcmp(arg, "--verify-stat-only")) {
1573 verify = 1;
1574 show_stat = 1;
1575 stat_only = 1;
1576 } else if (!strcmp(arg, "--keep")) {
1577 keep_msg = "";
1578 } else if (starts_with(arg, "--keep=")) {
1579 keep_msg = arg + 7;
1580 } else if (starts_with(arg, "--threads=")) {
1581 char *end;
1582 nr_threads = strtoul(arg+10, &end, 0);
1583 if (!arg[10] || *end || nr_threads < 0)
1584 usage(index_pack_usage);
1585 #ifdef NO_PTHREADS
1586 if (nr_threads != 1)
1587 warning(_("no threads support, "
1588 "ignoring %s"), arg);
1589 nr_threads = 1;
1590 #endif
1591 } else if (starts_with(arg, "--pack_header=")) {
1592 struct pack_header *hdr;
1593 char *c;
1594
1595 hdr = (struct pack_header *)input_buffer;
1596 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1597 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1598 if (*c != ',')
1599 die(_("bad %s"), arg);
1600 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1601 if (*c)
1602 die(_("bad %s"), arg);
1603 input_len = sizeof(*hdr);
1604 } else if (!strcmp(arg, "-v")) {
1605 verbose = 1;
1606 } else if (!strcmp(arg, "-o")) {
1607 if (index_name || (i+1) >= argc)
1608 usage(index_pack_usage);
1609 index_name = argv[++i];
1610 } else if (starts_with(arg, "--index-version=")) {
1611 char *c;
1612 opts.version = strtoul(arg + 16, &c, 10);
1613 if (opts.version > 2)
1614 die(_("bad %s"), arg);
1615 if (*c == ',')
1616 opts.off32_limit = strtoul(c+1, &c, 0);
1617 if (*c || opts.off32_limit & 0x80000000)
1618 die(_("bad %s"), arg);
1619 } else
1620 usage(index_pack_usage);
1621 continue;
1622 }
1623
1624 if (pack_name)
1625 usage(index_pack_usage);
1626 pack_name = arg;
1627 }
1628
1629 if (!pack_name && !from_stdin)
1630 usage(index_pack_usage);
1631 if (fix_thin_pack && !from_stdin)
1632 die(_("--fix-thin cannot be used without --stdin"));
1633 if (!index_name && pack_name) {
1634 size_t len;
1635 if (!strip_suffix(pack_name, ".pack", &len))
1636 die(_("packfile name '%s' does not end with '.pack'"),
1637 pack_name);
1638 strbuf_add(&index_name_buf, pack_name, len);
1639 strbuf_addstr(&index_name_buf, ".idx");
1640 index_name = index_name_buf.buf;
1641 }
1642 if (keep_msg && !keep_name && pack_name) {
1643 size_t len;
1644 if (!strip_suffix(pack_name, ".pack", &len))
1645 die(_("packfile name '%s' does not end with '.pack'"),
1646 pack_name);
1647 strbuf_add(&keep_name_buf, pack_name, len);
1648 strbuf_addstr(&keep_name_buf, ".idx");
1649 keep_name = keep_name_buf.buf;
1650 }
1651 if (verify) {
1652 if (!index_name)
1653 die(_("--verify with no packfile name given"));
1654 read_idx_option(&opts, index_name);
1655 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1656 }
1657 if (strict)
1658 opts.flags |= WRITE_IDX_STRICT;
1659
1660 #ifndef NO_PTHREADS
1661 if (!nr_threads) {
1662 nr_threads = online_cpus();
1663 /* An experiment showed that more threads does not mean faster */
1664 if (nr_threads > 3)
1665 nr_threads = 3;
1666 }
1667 #endif
1668
1669 curr_pack = open_pack_file(pack_name);
1670 parse_pack_header();
1671 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1672 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1673 parse_pack_objects(pack_sha1);
1674 resolve_deltas();
1675 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1676 free(deltas);
1677 if (strict)
1678 foreign_nr = check_objects();
1679
1680 if (show_stat)
1681 show_pack_info(stat_only);
1682
1683 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1684 for (i = 0; i < nr_objects; i++)
1685 idx_objects[i] = &objects[i].idx;
1686 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1687 free(idx_objects);
1688
1689 if (!verify)
1690 final(pack_name, curr_pack,
1691 index_name, curr_index,
1692 keep_name, keep_msg,
1693 pack_sha1);
1694 else
1695 close(input_fd);
1696 free(objects);
1697 strbuf_release(&index_name_buf);
1698 strbuf_release(&keep_name_buf);
1699 if (pack_name == NULL)
1700 free((void *) curr_pack);
1701 if (index_name == NULL)
1702 free((void *) curr_index);
1703
1704 /*
1705 * Let the caller know this pack is not self contained
1706 */
1707 if (check_self_contained_and_connected && foreign_nr)
1708 return 1;
1709
1710 return 0;
1711 }
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