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index-pack: reduce object_entry size to save memory
[git/mjg.git] / builtin / index-pack.c
blob9d854fb751931840449b2d5dc0b30c9edcb6164c
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 union delta_base {
32 unsigned char sha1[20];
33 off_t offset;
34 };
35
36 struct base_data {
37 struct base_data *base;
38 struct base_data *child;
39 struct object_entry *obj;
40 void *data;
41 unsigned long size;
42 int ref_first, ref_last;
43 int ofs_first, ofs_last;
44 };
45
46 struct thread_local {
47 #ifndef NO_PTHREADS
48 pthread_t thread;
49 #endif
50 struct base_data *base_cache;
51 size_t base_cache_used;
52 int pack_fd;
53 };
54
55 /*
56 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
57 * to memcmp() only the first 20 bytes.
58 */
59 #define UNION_BASE_SZ 20
60
61 #define FLAG_LINK (1u<<20)
62 #define FLAG_CHECKED (1u<<21)
63
64 struct delta_entry {
65 union delta_base base;
66 int obj_no;
67 };
68
69 static struct object_entry *objects;
70 static struct object_stat *obj_stat;
71 static struct delta_entry *deltas;
72 static struct thread_local nothread_data;
73 static int nr_objects;
74 static int nr_deltas;
75 static int nr_resolved_deltas;
76 static int nr_threads;
77
78 static int from_stdin;
79 static int strict;
80 static int do_fsck_object;
81 static int verbose;
82 static int show_stat;
83 static int check_self_contained_and_connected;
84
85 static struct progress *progress;
86
87 /* We always read in 4kB chunks. */
88 static unsigned char input_buffer[4096];
89 static unsigned int input_offset, input_len;
90 static off_t consumed_bytes;
91 static unsigned deepest_delta;
92 static git_SHA_CTX input_ctx;
93 static uint32_t input_crc32;
94 static int input_fd, output_fd;
95 static const char *curr_pack;
96
97 #ifndef NO_PTHREADS
98
99 static struct thread_local *thread_data;
100 static int nr_dispatched;
101 static int threads_active;
102
103 static pthread_mutex_t read_mutex;
104 #define read_lock() lock_mutex(&read_mutex)
105 #define read_unlock() unlock_mutex(&read_mutex)
106
107 static pthread_mutex_t counter_mutex;
108 #define counter_lock() lock_mutex(&counter_mutex)
109 #define counter_unlock() unlock_mutex(&counter_mutex)
110
111 static pthread_mutex_t work_mutex;
112 #define work_lock() lock_mutex(&work_mutex)
113 #define work_unlock() unlock_mutex(&work_mutex)
114
115 static pthread_mutex_t deepest_delta_mutex;
116 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
117 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
118
119 static pthread_mutex_t type_cas_mutex;
120 #define type_cas_lock() lock_mutex(&type_cas_mutex)
121 #define type_cas_unlock() unlock_mutex(&type_cas_mutex)
122
123 static pthread_key_t key;
124
125 static inline void lock_mutex(pthread_mutex_t *mutex)
126 {
127 if (threads_active)
128 pthread_mutex_lock(mutex);
129 }
130
131 static inline void unlock_mutex(pthread_mutex_t *mutex)
132 {
133 if (threads_active)
134 pthread_mutex_unlock(mutex);
135 }
136
137 /*
138 * Mutex and conditional variable can't be statically-initialized on Windows.
139 */
140 static void init_thread(void)
141 {
142 int i;
143 init_recursive_mutex(&read_mutex);
144 pthread_mutex_init(&counter_mutex, NULL);
145 pthread_mutex_init(&work_mutex, NULL);
146 pthread_mutex_init(&type_cas_mutex, NULL);
147 if (show_stat)
148 pthread_mutex_init(&deepest_delta_mutex, NULL);
149 pthread_key_create(&key, NULL);
150 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
151 for (i = 0; i < nr_threads; i++) {
152 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
153 if (thread_data[i].pack_fd == -1)
154 die_errno(_("unable to open %s"), curr_pack);
155 }
156
157 threads_active = 1;
158 }
159
160 static void cleanup_thread(void)
161 {
162 int i;
163 if (!threads_active)
164 return;
165 threads_active = 0;
166 pthread_mutex_destroy(&read_mutex);
167 pthread_mutex_destroy(&counter_mutex);
168 pthread_mutex_destroy(&work_mutex);
169 pthread_mutex_destroy(&type_cas_mutex);
170 if (show_stat)
171 pthread_mutex_destroy(&deepest_delta_mutex);
172 for (i = 0; i < nr_threads; i++)
173 close(thread_data[i].pack_fd);
174 pthread_key_delete(key);
175 free(thread_data);
176 }
177
178 #else
179
180 #define read_lock()
181 #define read_unlock()
182
183 #define counter_lock()
184 #define counter_unlock()
185
186 #define work_lock()
187 #define work_unlock()
188
189 #define deepest_delta_lock()
190 #define deepest_delta_unlock()
191
192 #define type_cas_lock()
193 #define type_cas_unlock()
194
195 #endif
196
197
198 static int mark_link(struct object *obj, int type, void *data)
199 {
200 if (!obj)
201 return -1;
202
203 if (type != OBJ_ANY && obj->type != type)
204 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
205
206 obj->flags |= FLAG_LINK;
207 return 0;
208 }
209
210 /* The content of each linked object must have been checked
211 or it must be already present in the object database */
212 static unsigned check_object(struct object *obj)
213 {
214 if (!obj)
215 return 0;
216
217 if (!(obj->flags & FLAG_LINK))
218 return 0;
219
220 if (!(obj->flags & FLAG_CHECKED)) {
221 unsigned long size;
222 int type = sha1_object_info(obj->sha1, &size);
223 if (type <= 0)
224 die(_("did not receive expected object %s"),
225 sha1_to_hex(obj->sha1));
226 if (type != obj->type)
227 die(_("object %s: expected type %s, found %s"),
228 sha1_to_hex(obj->sha1),
229 typename(obj->type), typename(type));
230 obj->flags |= FLAG_CHECKED;
231 return 1;
232 }
233
234 return 0;
235 }
236
237 static unsigned check_objects(void)
238 {
239 unsigned i, max, foreign_nr = 0;
240
241 max = get_max_object_index();
242 for (i = 0; i < max; i++)
243 foreign_nr += check_object(get_indexed_object(i));
244 return foreign_nr;
245 }
246
247
248 /* Discard current buffer used content. */
249 static void flush(void)
250 {
251 if (input_offset) {
252 if (output_fd >= 0)
253 write_or_die(output_fd, input_buffer, input_offset);
254 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
255 memmove(input_buffer, input_buffer + input_offset, input_len);
256 input_offset = 0;
257 }
258 }
259
260 /*
261 * Make sure at least "min" bytes are available in the buffer, and
262 * return the pointer to the buffer.
263 */
264 static void *fill(int min)
265 {
266 if (min <= input_len)
267 return input_buffer + input_offset;
268 if (min > sizeof(input_buffer))
269 die(Q_("cannot fill %d byte",
270 "cannot fill %d bytes",
271 min),
272 min);
273 flush();
274 do {
275 ssize_t ret = xread(input_fd, input_buffer + input_len,
276 sizeof(input_buffer) - input_len);
277 if (ret <= 0) {
278 if (!ret)
279 die(_("early EOF"));
280 die_errno(_("read error on input"));
281 }
282 input_len += ret;
283 if (from_stdin)
284 display_throughput(progress, consumed_bytes + input_len);
285 } while (input_len < min);
286 return input_buffer;
287 }
288
289 static void use(int bytes)
290 {
291 if (bytes > input_len)
292 die(_("used more bytes than were available"));
293 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
294 input_len -= bytes;
295 input_offset += bytes;
296
297 /* make sure off_t is sufficiently large not to wrap */
298 if (signed_add_overflows(consumed_bytes, bytes))
299 die(_("pack too large for current definition of off_t"));
300 consumed_bytes += bytes;
301 }
302
303 static const char *open_pack_file(const char *pack_name)
304 {
305 if (from_stdin) {
306 input_fd = 0;
307 if (!pack_name) {
308 static char tmp_file[PATH_MAX];
309 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
310 "pack/tmp_pack_XXXXXX");
311 pack_name = xstrdup(tmp_file);
312 } else
313 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
314 if (output_fd < 0)
315 die_errno(_("unable to create '%s'"), pack_name);
316 nothread_data.pack_fd = output_fd;
317 } else {
318 input_fd = open(pack_name, O_RDONLY);
319 if (input_fd < 0)
320 die_errno(_("cannot open packfile '%s'"), pack_name);
321 output_fd = -1;
322 nothread_data.pack_fd = input_fd;
323 }
324 git_SHA1_Init(&input_ctx);
325 return pack_name;
326 }
327
328 static void parse_pack_header(void)
329 {
330 struct pack_header *hdr = fill(sizeof(struct pack_header));
331
332 /* Header consistency check */
333 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
334 die(_("pack signature mismatch"));
335 if (!pack_version_ok(hdr->hdr_version))
336 die(_("pack version %"PRIu32" unsupported"),
337 ntohl(hdr->hdr_version));
338
339 nr_objects = ntohl(hdr->hdr_entries);
340 use(sizeof(struct pack_header));
341 }
342
343 static NORETURN void bad_object(unsigned long offset, const char *format,
344 ...) __attribute__((format (printf, 2, 3)));
345
346 static NORETURN void bad_object(unsigned long offset, const char *format, ...)
347 {
348 va_list params;
349 char buf[1024];
350
351 va_start(params, format);
352 vsnprintf(buf, sizeof(buf), format, params);
353 va_end(params);
354 die(_("pack has bad object at offset %lu: %s"), 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(unsigned long 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 = sprintf(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 union delta_base *delta_base,
484 unsigned char *sha1)
485 {
486 unsigned char *p;
487 unsigned long size, c;
488 off_t base_offset;
489 unsigned shift;
490 void *data;
491
492 obj->idx.offset = consumed_bytes;
493 input_crc32 = crc32(0, NULL, 0);
494
495 p = fill(1);
496 c = *p;
497 use(1);
498 obj->type = (c >> 4) & 7;
499 size = (c & 15);
500 shift = 4;
501 while (c & 0x80) {
502 p = fill(1);
503 c = *p;
504 use(1);
505 size += (c & 0x7f) << shift;
506 shift += 7;
507 }
508 obj->size = size;
509
510 switch (obj->type) {
511 case OBJ_REF_DELTA:
512 hashcpy(delta_base->sha1, fill(20));
513 use(20);
514 break;
515 case OBJ_OFS_DELTA:
516 memset(delta_base, 0, sizeof(*delta_base));
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 delta_base->offset = obj->idx.offset - base_offset;
531 if (delta_base->offset <= 0 || delta_base->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 unsigned long 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) ? 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) ? 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, %lu byte missing",
574 "premature end of pack file, %lu bytes missing",
575 len),
576 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_delta_bases(const union delta_base *base1,
616 const union delta_base *base2,
617 enum object_type type1,
618 enum object_type type2)
619 {
620 int cmp = type1 - type2;
621 if (cmp)
622 return cmp;
623 return memcmp(base1, base2, UNION_BASE_SZ);
624 }
625
626 static int find_delta(const union delta_base *base, enum object_type type)
627 {
628 int first = 0, last = nr_deltas;
629
630 while (first < last) {
631 int next = (first + last) / 2;
632 struct delta_entry *delta = &deltas[next];
633 int cmp;
634
635 cmp = compare_delta_bases(base, &delta->base,
636 type, objects[delta->obj_no].type);
637 if (!cmp)
638 return next;
639 if (cmp < 0) {
640 last = next;
641 continue;
642 }
643 first = next+1;
644 }
645 return -first-1;
646 }
647
648 static void find_delta_children(const union delta_base *base,
649 int *first_index, int *last_index,
650 enum object_type type)
651 {
652 int first = find_delta(base, type);
653 int last = first;
654 int end = nr_deltas - 1;
655
656 if (first < 0) {
657 *first_index = 0;
658 *last_index = -1;
659 return;
660 }
661 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
662 --first;
663 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
664 ++last;
665 *first_index = first;
666 *last_index = last;
667 }
668
669 struct compare_data {
670 struct object_entry *entry;
671 struct git_istream *st;
672 unsigned char *buf;
673 unsigned long buf_size;
674 };
675
676 static int compare_objects(const unsigned char *buf, unsigned long size,
677 void *cb_data)
678 {
679 struct compare_data *data = cb_data;
680
681 if (data->buf_size < size) {
682 free(data->buf);
683 data->buf = xmalloc(size);
684 data->buf_size = size;
685 }
686
687 while (size) {
688 ssize_t len = read_istream(data->st, data->buf, size);
689 if (len == 0)
690 die(_("SHA1 COLLISION FOUND WITH %s !"),
691 sha1_to_hex(data->entry->idx.sha1));
692 if (len < 0)
693 die(_("unable to read %s"),
694 sha1_to_hex(data->entry->idx.sha1));
695 if (memcmp(buf, data->buf, len))
696 die(_("SHA1 COLLISION FOUND WITH %s !"),
697 sha1_to_hex(data->entry->idx.sha1));
698 size -= len;
699 buf += len;
700 }
701 return 0;
702 }
703
704 static int check_collison(struct object_entry *entry)
705 {
706 struct compare_data data;
707 enum object_type type;
708 unsigned long size;
709
710 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
711 return -1;
712
713 memset(&data, 0, sizeof(data));
714 data.entry = entry;
715 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
716 if (!data.st)
717 return -1;
718 if (size != entry->size || type != entry->type)
719 die(_("SHA1 COLLISION FOUND WITH %s !"),
720 sha1_to_hex(entry->idx.sha1));
721 unpack_data(entry, compare_objects, &data);
722 close_istream(data.st);
723 free(data.buf);
724 return 0;
725 }
726
727 static void sha1_object(const void *data, struct object_entry *obj_entry,
728 unsigned long size, enum object_type type,
729 const unsigned char *sha1)
730 {
731 void *new_data = NULL;
732 int collision_test_needed;
733
734 assert(data || obj_entry);
735
736 read_lock();
737 collision_test_needed = has_sha1_file(sha1);
738 read_unlock();
739
740 if (collision_test_needed && !data) {
741 read_lock();
742 if (!check_collison(obj_entry))
743 collision_test_needed = 0;
744 read_unlock();
745 }
746 if (collision_test_needed) {
747 void *has_data;
748 enum object_type has_type;
749 unsigned long has_size;
750 read_lock();
751 has_type = sha1_object_info(sha1, &has_size);
752 if (has_type != type || has_size != size)
753 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
754 has_data = read_sha1_file(sha1, &has_type, &has_size);
755 read_unlock();
756 if (!data)
757 data = new_data = get_data_from_pack(obj_entry);
758 if (!has_data)
759 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
760 if (size != has_size || type != has_type ||
761 memcmp(data, has_data, size) != 0)
762 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
763 free(has_data);
764 }
765
766 if (strict) {
767 read_lock();
768 if (type == OBJ_BLOB) {
769 struct blob *blob = lookup_blob(sha1);
770 if (blob)
771 blob->object.flags |= FLAG_CHECKED;
772 else
773 die(_("invalid blob object %s"), sha1_to_hex(sha1));
774 } else {
775 struct object *obj;
776 int eaten;
777 void *buf = (void *) data;
778
779 assert(data && "data can only be NULL for large _blobs_");
780
781 /*
782 * we do not need to free the memory here, as the
783 * buf is deleted by the caller.
784 */
785 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
786 if (!obj)
787 die(_("invalid %s"), typename(type));
788 if (do_fsck_object &&
789 fsck_object(obj, buf, size, 1,
790 fsck_error_function))
791 die(_("Error in object"));
792 if (fsck_walk(obj, mark_link, NULL))
793 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
794
795 if (obj->type == OBJ_TREE) {
796 struct tree *item = (struct tree *) obj;
797 item->buffer = NULL;
798 obj->parsed = 0;
799 }
800 if (obj->type == OBJ_COMMIT) {
801 struct commit *commit = (struct commit *) obj;
802 if (detach_commit_buffer(commit, NULL) != data)
803 die("BUG: parse_object_buffer transmogrified our buffer");
804 }
805 obj->flags |= FLAG_CHECKED;
806 }
807 read_unlock();
808 }
809
810 free(new_data);
811 }
812
813 /*
814 * This function is part of find_unresolved_deltas(). There are two
815 * walkers going in the opposite ways.
816 *
817 * The first one in find_unresolved_deltas() traverses down from
818 * parent node to children, deflating nodes along the way. However,
819 * memory for deflated nodes is limited by delta_base_cache_limit, so
820 * at some point parent node's deflated content may be freed.
821 *
822 * The second walker is this function, which goes from current node up
823 * to top parent if necessary to deflate the node. In normal
824 * situation, its parent node would be already deflated, so it just
825 * needs to apply delta.
826 *
827 * In the worst case scenario, parent node is no longer deflated because
828 * we're running out of delta_base_cache_limit; we need to re-deflate
829 * parents, possibly up to the top base.
830 *
831 * All deflated objects here are subject to be freed if we exceed
832 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
833 * just need to make sure the last node is not freed.
834 */
835 static void *get_base_data(struct base_data *c)
836 {
837 if (!c->data) {
838 struct object_entry *obj = c->obj;
839 struct base_data **delta = NULL;
840 int delta_nr = 0, delta_alloc = 0;
841
842 while (is_delta_type(c->obj->type) && !c->data) {
843 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
844 delta[delta_nr++] = c;
845 c = c->base;
846 }
847 if (!delta_nr) {
848 c->data = get_data_from_pack(obj);
849 c->size = obj->size;
850 get_thread_data()->base_cache_used += c->size;
851 prune_base_data(c);
852 }
853 for (; delta_nr > 0; delta_nr--) {
854 void *base, *raw;
855 c = delta[delta_nr - 1];
856 obj = c->obj;
857 base = get_base_data(c->base);
858 raw = get_data_from_pack(obj);
859 c->data = patch_delta(
860 base, c->base->size,
861 raw, obj->size,
862 &c->size);
863 free(raw);
864 if (!c->data)
865 bad_object(obj->idx.offset, _("failed to apply delta"));
866 get_thread_data()->base_cache_used += c->size;
867 prune_base_data(c);
868 }
869 free(delta);
870 }
871 return c->data;
872 }
873
874 static void resolve_delta(struct object_entry *delta_obj,
875 struct base_data *base, struct base_data *result)
876 {
877 void *base_data, *delta_data;
878
879 if (show_stat) {
880 int i = delta_obj - objects;
881 int j = base->obj - objects;
882 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
883 deepest_delta_lock();
884 if (deepest_delta < obj_stat[i].delta_depth)
885 deepest_delta = obj_stat[i].delta_depth;
886 deepest_delta_unlock();
887 obj_stat[i].base_object_no = j;
888 }
889 delta_data = get_data_from_pack(delta_obj);
890 base_data = get_base_data(base);
891 result->obj = delta_obj;
892 result->data = patch_delta(base_data, base->size,
893 delta_data, delta_obj->size, &result->size);
894 free(delta_data);
895 if (!result->data)
896 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
897 hash_sha1_file(result->data, result->size,
898 typename(delta_obj->real_type), delta_obj->idx.sha1);
899 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
900 delta_obj->idx.sha1);
901 counter_lock();
902 nr_resolved_deltas++;
903 counter_unlock();
904 }
905
906 /*
907 * Standard boolean compare-and-swap: atomically check whether "*type" is
908 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
909 * and return false.
910 */
911 static int compare_and_swap_type(signed char *type,
912 enum object_type want,
913 enum object_type set)
914 {
915 enum object_type old;
916
917 type_cas_lock();
918 old = *type;
919 if (old == want)
920 *type = set;
921 type_cas_unlock();
922
923 return old == want;
924 }
925
926 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
927 struct base_data *prev_base)
928 {
929 if (base->ref_last == -1 && base->ofs_last == -1) {
930 union delta_base base_spec;
931
932 hashcpy(base_spec.sha1, base->obj->idx.sha1);
933 find_delta_children(&base_spec,
934 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
935
936 memset(&base_spec, 0, sizeof(base_spec));
937 base_spec.offset = base->obj->idx.offset;
938 find_delta_children(&base_spec,
939 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
940
941 if (base->ref_last == -1 && base->ofs_last == -1) {
942 free(base->data);
943 return NULL;
944 }
945
946 link_base_data(prev_base, base);
947 }
948
949 if (base->ref_first <= base->ref_last) {
950 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
951 struct base_data *result = alloc_base_data();
952
953 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
954 base->obj->real_type))
955 die("BUG: child->real_type != OBJ_REF_DELTA");
956
957 resolve_delta(child, base, result);
958 if (base->ref_first == base->ref_last && base->ofs_last == -1)
959 free_base_data(base);
960
961 base->ref_first++;
962 return result;
963 }
964
965 if (base->ofs_first <= base->ofs_last) {
966 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
967 struct base_data *result = alloc_base_data();
968
969 assert(child->real_type == OBJ_OFS_DELTA);
970 child->real_type = base->obj->real_type;
971 resolve_delta(child, base, result);
972 if (base->ofs_first == base->ofs_last)
973 free_base_data(base);
974
975 base->ofs_first++;
976 return result;
977 }
978
979 unlink_base_data(base);
980 return NULL;
981 }
982
983 static void find_unresolved_deltas(struct base_data *base)
984 {
985 struct base_data *new_base, *prev_base = NULL;
986 for (;;) {
987 new_base = find_unresolved_deltas_1(base, prev_base);
988
989 if (new_base) {
990 prev_base = base;
991 base = new_base;
992 } else {
993 free(base);
994 base = prev_base;
995 if (!base)
996 return;
997 prev_base = base->base;
998 }
999 }
1000 }
1001
1002 static int compare_delta_entry(const void *a, const void *b)
1003 {
1004 const struct delta_entry *delta_a = a;
1005 const struct delta_entry *delta_b = b;
1006
1007 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
1008 return compare_delta_bases(&delta_a->base, &delta_b->base,
1009 objects[delta_a->obj_no].type,
1010 objects[delta_b->obj_no].type);
1011 }
1012
1013 static void resolve_base(struct object_entry *obj)
1014 {
1015 struct base_data *base_obj = alloc_base_data();
1016 base_obj->obj = obj;
1017 base_obj->data = NULL;
1018 find_unresolved_deltas(base_obj);
1019 }
1020
1021 #ifndef NO_PTHREADS
1022 static void *threaded_second_pass(void *data)
1023 {
1024 set_thread_data(data);
1025 for (;;) {
1026 int i;
1027 counter_lock();
1028 display_progress(progress, nr_resolved_deltas);
1029 counter_unlock();
1030 work_lock();
1031 while (nr_dispatched < nr_objects &&
1032 is_delta_type(objects[nr_dispatched].type))
1033 nr_dispatched++;
1034 if (nr_dispatched >= nr_objects) {
1035 work_unlock();
1036 break;
1037 }
1038 i = nr_dispatched++;
1039 work_unlock();
1040
1041 resolve_base(&objects[i]);
1042 }
1043 return NULL;
1044 }
1045 #endif
1046
1047 /*
1048 * First pass:
1049 * - find locations of all objects;
1050 * - calculate SHA1 of all non-delta objects;
1051 * - remember base (SHA1 or offset) for all deltas.
1052 */
1053 static void parse_pack_objects(unsigned char *sha1)
1054 {
1055 int i, nr_delays = 0;
1056 struct delta_entry *delta = deltas;
1057 struct stat st;
1058
1059 if (verbose)
1060 progress = start_progress(
1061 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1062 nr_objects);
1063 for (i = 0; i < nr_objects; i++) {
1064 struct object_entry *obj = &objects[i];
1065 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
1066 obj->real_type = obj->type;
1067 if (is_delta_type(obj->type)) {
1068 nr_deltas++;
1069 delta->obj_no = i;
1070 delta++;
1071 } else if (!data) {
1072 /* large blobs, check later */
1073 obj->real_type = OBJ_BAD;
1074 nr_delays++;
1075 } else
1076 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1077 free(data);
1078 display_progress(progress, i+1);
1079 }
1080 objects[i].idx.offset = consumed_bytes;
1081 stop_progress(&progress);
1082
1083 /* Check pack integrity */
1084 flush();
1085 git_SHA1_Final(sha1, &input_ctx);
1086 if (hashcmp(fill(20), sha1))
1087 die(_("pack is corrupted (SHA1 mismatch)"));
1088 use(20);
1089
1090 /* If input_fd is a file, we should have reached its end now. */
1091 if (fstat(input_fd, &st))
1092 die_errno(_("cannot fstat packfile"));
1093 if (S_ISREG(st.st_mode) &&
1094 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1095 die(_("pack has junk at the end"));
1096
1097 for (i = 0; i < nr_objects; i++) {
1098 struct object_entry *obj = &objects[i];
1099 if (obj->real_type != OBJ_BAD)
1100 continue;
1101 obj->real_type = obj->type;
1102 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1103 nr_delays--;
1104 }
1105 if (nr_delays)
1106 die(_("confusion beyond insanity in parse_pack_objects()"));
1107 }
1108
1109 /*
1110 * Second pass:
1111 * - for all non-delta objects, look if it is used as a base for
1112 * deltas;
1113 * - if used as a base, uncompress the object and apply all deltas,
1114 * recursively checking if the resulting object is used as a base
1115 * for some more deltas.
1116 */
1117 static void resolve_deltas(void)
1118 {
1119 int i;
1120
1121 if (!nr_deltas)
1122 return;
1123
1124 /* Sort deltas by base SHA1/offset for fast searching */
1125 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1126 compare_delta_entry);
1127
1128 if (verbose)
1129 progress = start_progress(_("Resolving deltas"), nr_deltas);
1130
1131 #ifndef NO_PTHREADS
1132 nr_dispatched = 0;
1133 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1134 init_thread();
1135 for (i = 0; i < nr_threads; i++) {
1136 int ret = pthread_create(&thread_data[i].thread, NULL,
1137 threaded_second_pass, thread_data + i);
1138 if (ret)
1139 die(_("unable to create thread: %s"),
1140 strerror(ret));
1141 }
1142 for (i = 0; i < nr_threads; i++)
1143 pthread_join(thread_data[i].thread, NULL);
1144 cleanup_thread();
1145 return;
1146 }
1147 #endif
1148
1149 for (i = 0; i < nr_objects; i++) {
1150 struct object_entry *obj = &objects[i];
1151
1152 if (is_delta_type(obj->type))
1153 continue;
1154 resolve_base(obj);
1155 display_progress(progress, nr_resolved_deltas);
1156 }
1157 }
1158
1159 /*
1160 * Third pass:
1161 * - append objects to convert thin pack to full pack if required
1162 * - write the final 20-byte SHA-1
1163 */
1164 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1165 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1166 {
1167 if (nr_deltas == nr_resolved_deltas) {
1168 stop_progress(&progress);
1169 /* Flush remaining pack final 20-byte SHA1. */
1170 flush();
1171 return;
1172 }
1173
1174 if (fix_thin_pack) {
1175 struct sha1file *f;
1176 unsigned char read_sha1[20], tail_sha1[20];
1177 struct strbuf msg = STRBUF_INIT;
1178 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1179 int nr_objects_initial = nr_objects;
1180 if (nr_unresolved <= 0)
1181 die(_("confusion beyond insanity"));
1182 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1183 memset(objects + nr_objects + 1, 0,
1184 nr_unresolved * sizeof(*objects));
1185 f = sha1fd(output_fd, curr_pack);
1186 fix_unresolved_deltas(f, nr_unresolved);
1187 strbuf_addf(&msg, _("completed with %d local objects"),
1188 nr_objects - nr_objects_initial);
1189 stop_progress_msg(&progress, msg.buf);
1190 strbuf_release(&msg);
1191 sha1close(f, tail_sha1, 0);
1192 hashcpy(read_sha1, pack_sha1);
1193 fixup_pack_header_footer(output_fd, pack_sha1,
1194 curr_pack, nr_objects,
1195 read_sha1, consumed_bytes-20);
1196 if (hashcmp(read_sha1, tail_sha1) != 0)
1197 die(_("Unexpected tail checksum for %s "
1198 "(disk corruption?)"), curr_pack);
1199 }
1200 if (nr_deltas != nr_resolved_deltas)
1201 die(Q_("pack has %d unresolved delta",
1202 "pack has %d unresolved deltas",
1203 nr_deltas - nr_resolved_deltas),
1204 nr_deltas - nr_resolved_deltas);
1205 }
1206
1207 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1208 {
1209 git_zstream stream;
1210 int status;
1211 unsigned char outbuf[4096];
1212
1213 memset(&stream, 0, sizeof(stream));
1214 git_deflate_init(&stream, zlib_compression_level);
1215 stream.next_in = in;
1216 stream.avail_in = size;
1217
1218 do {
1219 stream.next_out = outbuf;
1220 stream.avail_out = sizeof(outbuf);
1221 status = git_deflate(&stream, Z_FINISH);
1222 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1223 } while (status == Z_OK);
1224
1225 if (status != Z_STREAM_END)
1226 die(_("unable to deflate appended object (%d)"), status);
1227 size = stream.total_out;
1228 git_deflate_end(&stream);
1229 return size;
1230 }
1231
1232 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1233 const unsigned char *sha1, void *buf,
1234 unsigned long size, enum object_type type)
1235 {
1236 struct object_entry *obj = &objects[nr_objects++];
1237 unsigned char header[10];
1238 unsigned long s = size;
1239 int n = 0;
1240 unsigned char c = (type << 4) | (s & 15);
1241 s >>= 4;
1242 while (s) {
1243 header[n++] = c | 0x80;
1244 c = s & 0x7f;
1245 s >>= 7;
1246 }
1247 header[n++] = c;
1248 crc32_begin(f);
1249 sha1write(f, header, n);
1250 obj[0].size = size;
1251 obj[0].hdr_size = n;
1252 obj[0].type = type;
1253 obj[0].real_type = type;
1254 obj[1].idx.offset = obj[0].idx.offset + n;
1255 obj[1].idx.offset += write_compressed(f, buf, size);
1256 obj[0].idx.crc32 = crc32_end(f);
1257 sha1flush(f);
1258 hashcpy(obj->idx.sha1, sha1);
1259 return obj;
1260 }
1261
1262 static int delta_pos_compare(const void *_a, const void *_b)
1263 {
1264 struct delta_entry *a = *(struct delta_entry **)_a;
1265 struct delta_entry *b = *(struct delta_entry **)_b;
1266 return a->obj_no - b->obj_no;
1267 }
1268
1269 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1270 {
1271 struct delta_entry **sorted_by_pos;
1272 int i, n = 0;
1273
1274 /*
1275 * Since many unresolved deltas may well be themselves base objects
1276 * for more unresolved deltas, we really want to include the
1277 * smallest number of base objects that would cover as much delta
1278 * as possible by picking the
1279 * trunc deltas first, allowing for other deltas to resolve without
1280 * additional base objects. Since most base objects are to be found
1281 * before deltas depending on them, a good heuristic is to start
1282 * resolving deltas in the same order as their position in the pack.
1283 */
1284 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1285 for (i = 0; i < nr_deltas; i++) {
1286 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1287 continue;
1288 sorted_by_pos[n++] = &deltas[i];
1289 }
1290 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1291
1292 for (i = 0; i < n; i++) {
1293 struct delta_entry *d = sorted_by_pos[i];
1294 enum object_type type;
1295 struct base_data *base_obj = alloc_base_data();
1296
1297 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1298 continue;
1299 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1300 if (!base_obj->data)
1301 continue;
1302
1303 if (check_sha1_signature(d->base.sha1, base_obj->data,
1304 base_obj->size, typename(type)))
1305 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1306 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1307 base_obj->data, base_obj->size, type);
1308 find_unresolved_deltas(base_obj);
1309 display_progress(progress, nr_resolved_deltas);
1310 }
1311 free(sorted_by_pos);
1312 }
1313
1314 static void final(const char *final_pack_name, const char *curr_pack_name,
1315 const char *final_index_name, const char *curr_index_name,
1316 const char *keep_name, const char *keep_msg,
1317 unsigned char *sha1)
1318 {
1319 const char *report = "pack";
1320 char name[PATH_MAX];
1321 int err;
1322
1323 if (!from_stdin) {
1324 close(input_fd);
1325 } else {
1326 fsync_or_die(output_fd, curr_pack_name);
1327 err = close(output_fd);
1328 if (err)
1329 die_errno(_("error while closing pack file"));
1330 }
1331
1332 if (keep_msg) {
1333 int keep_fd, keep_msg_len = strlen(keep_msg);
1334
1335 if (!keep_name)
1336 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1337 else
1338 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1339
1340 if (keep_fd < 0) {
1341 if (errno != EEXIST)
1342 die_errno(_("cannot write keep file '%s'"),
1343 keep_name ? keep_name : name);
1344 } else {
1345 if (keep_msg_len > 0) {
1346 write_or_die(keep_fd, keep_msg, keep_msg_len);
1347 write_or_die(keep_fd, "\n", 1);
1348 }
1349 if (close(keep_fd) != 0)
1350 die_errno(_("cannot close written keep file '%s'"),
1351 keep_name ? keep_name : name);
1352 report = "keep";
1353 }
1354 }
1355
1356 if (final_pack_name != curr_pack_name) {
1357 if (!final_pack_name) {
1358 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1359 get_object_directory(), sha1_to_hex(sha1));
1360 final_pack_name = name;
1361 }
1362 if (move_temp_to_file(curr_pack_name, final_pack_name))
1363 die(_("cannot store pack file"));
1364 } else if (from_stdin)
1365 chmod(final_pack_name, 0444);
1366
1367 if (final_index_name != curr_index_name) {
1368 if (!final_index_name) {
1369 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1370 get_object_directory(), sha1_to_hex(sha1));
1371 final_index_name = name;
1372 }
1373 if (move_temp_to_file(curr_index_name, final_index_name))
1374 die(_("cannot store index file"));
1375 } else
1376 chmod(final_index_name, 0444);
1377
1378 if (!from_stdin) {
1379 printf("%s\n", sha1_to_hex(sha1));
1380 } else {
1381 char buf[48];
1382 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1383 report, sha1_to_hex(sha1));
1384 write_or_die(1, buf, len);
1385
1386 /*
1387 * Let's just mimic git-unpack-objects here and write
1388 * the last part of the input buffer to stdout.
1389 */
1390 while (input_len) {
1391 err = xwrite(1, input_buffer + input_offset, input_len);
1392 if (err <= 0)
1393 break;
1394 input_len -= err;
1395 input_offset += err;
1396 }
1397 }
1398 }
1399
1400 static int git_index_pack_config(const char *k, const char *v, void *cb)
1401 {
1402 struct pack_idx_option *opts = cb;
1403
1404 if (!strcmp(k, "pack.indexversion")) {
1405 opts->version = git_config_int(k, v);
1406 if (opts->version > 2)
1407 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1408 return 0;
1409 }
1410 if (!strcmp(k, "pack.threads")) {
1411 nr_threads = git_config_int(k, v);
1412 if (nr_threads < 0)
1413 die(_("invalid number of threads specified (%d)"),
1414 nr_threads);
1415 #ifdef NO_PTHREADS
1416 if (nr_threads != 1)
1417 warning(_("no threads support, ignoring %s"), k);
1418 nr_threads = 1;
1419 #endif
1420 return 0;
1421 }
1422 return git_default_config(k, v, cb);
1423 }
1424
1425 static int cmp_uint32(const void *a_, const void *b_)
1426 {
1427 uint32_t a = *((uint32_t *)a_);
1428 uint32_t b = *((uint32_t *)b_);
1429
1430 return (a < b) ? -1 : (a != b);
1431 }
1432
1433 static void read_v2_anomalous_offsets(struct packed_git *p,
1434 struct pack_idx_option *opts)
1435 {
1436 const uint32_t *idx1, *idx2;
1437 uint32_t i;
1438
1439 /* The address of the 4-byte offset table */
1440 idx1 = (((const uint32_t *)p->index_data)
1441 + 2 /* 8-byte header */
1442 + 256 /* fan out */
1443 + 5 * p->num_objects /* 20-byte SHA-1 table */
1444 + p->num_objects /* CRC32 table */
1445 );
1446
1447 /* The address of the 8-byte offset table */
1448 idx2 = idx1 + p->num_objects;
1449
1450 for (i = 0; i < p->num_objects; i++) {
1451 uint32_t off = ntohl(idx1[i]);
1452 if (!(off & 0x80000000))
1453 continue;
1454 off = off & 0x7fffffff;
1455 if (idx2[off * 2])
1456 continue;
1457 /*
1458 * The real offset is ntohl(idx2[off * 2]) in high 4
1459 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1460 * octets. But idx2[off * 2] is Zero!!!
1461 */
1462 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1463 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1464 }
1465
1466 if (1 < opts->anomaly_nr)
1467 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1468 }
1469
1470 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1471 {
1472 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1473
1474 if (!p)
1475 die(_("Cannot open existing pack file '%s'"), pack_name);
1476 if (open_pack_index(p))
1477 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1478
1479 /* Read the attributes from the existing idx file */
1480 opts->version = p->index_version;
1481
1482 if (opts->version == 2)
1483 read_v2_anomalous_offsets(p, opts);
1484
1485 /*
1486 * Get rid of the idx file as we do not need it anymore.
1487 * NEEDSWORK: extract this bit from free_pack_by_name() in
1488 * sha1_file.c, perhaps? It shouldn't matter very much as we
1489 * know we haven't installed this pack (hence we never have
1490 * read anything from it).
1491 */
1492 close_pack_index(p);
1493 free(p);
1494 }
1495
1496 static void show_pack_info(int stat_only)
1497 {
1498 int i, baseobjects = nr_objects - nr_deltas;
1499 unsigned long *chain_histogram = NULL;
1500
1501 if (deepest_delta)
1502 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1503
1504 for (i = 0; i < nr_objects; i++) {
1505 struct object_entry *obj = &objects[i];
1506
1507 if (is_delta_type(obj->type))
1508 chain_histogram[obj_stat[i].delta_depth - 1]++;
1509 if (stat_only)
1510 continue;
1511 printf("%s %-6s %lu %lu %"PRIuMAX,
1512 sha1_to_hex(obj->idx.sha1),
1513 typename(obj->real_type), obj->size,
1514 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1515 (uintmax_t)obj->idx.offset);
1516 if (is_delta_type(obj->type)) {
1517 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1518 printf(" %u %s", obj_stat[i].delta_depth, sha1_to_hex(bobj->idx.sha1));
1519 }
1520 putchar('\n');
1521 }
1522
1523 if (baseobjects)
1524 printf_ln(Q_("non delta: %d object",
1525 "non delta: %d objects",
1526 baseobjects),
1527 baseobjects);
1528 for (i = 0; i < deepest_delta; i++) {
1529 if (!chain_histogram[i])
1530 continue;
1531 printf_ln(Q_("chain length = %d: %lu object",
1532 "chain length = %d: %lu objects",
1533 chain_histogram[i]),
1534 i + 1,
1535 chain_histogram[i]);
1536 }
1537 }
1538
1539 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1540 {
1541 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1542 const char *curr_index;
1543 const char *index_name = NULL, *pack_name = NULL;
1544 const char *keep_name = NULL, *keep_msg = NULL;
1545 struct strbuf index_name_buf = STRBUF_INIT,
1546 keep_name_buf = STRBUF_INIT;
1547 struct pack_idx_entry **idx_objects;
1548 struct pack_idx_option opts;
1549 unsigned char pack_sha1[20];
1550 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1551
1552 if (argc == 2 && !strcmp(argv[1], "-h"))
1553 usage(index_pack_usage);
1554
1555 check_replace_refs = 0;
1556
1557 reset_pack_idx_option(&opts);
1558 git_config(git_index_pack_config, &opts);
1559 if (prefix && chdir(prefix))
1560 die(_("Cannot come back to cwd"));
1561
1562 for (i = 1; i < argc; i++) {
1563 const char *arg = argv[i];
1564
1565 if (*arg == '-') {
1566 if (!strcmp(arg, "--stdin")) {
1567 from_stdin = 1;
1568 } else if (!strcmp(arg, "--fix-thin")) {
1569 fix_thin_pack = 1;
1570 } else if (!strcmp(arg, "--strict")) {
1571 strict = 1;
1572 do_fsck_object = 1;
1573 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1574 strict = 1;
1575 check_self_contained_and_connected = 1;
1576 } else if (!strcmp(arg, "--verify")) {
1577 verify = 1;
1578 } else if (!strcmp(arg, "--verify-stat")) {
1579 verify = 1;
1580 show_stat = 1;
1581 } else if (!strcmp(arg, "--verify-stat-only")) {
1582 verify = 1;
1583 show_stat = 1;
1584 stat_only = 1;
1585 } else if (!strcmp(arg, "--keep")) {
1586 keep_msg = "";
1587 } else if (starts_with(arg, "--keep=")) {
1588 keep_msg = arg + 7;
1589 } else if (starts_with(arg, "--threads=")) {
1590 char *end;
1591 nr_threads = strtoul(arg+10, &end, 0);
1592 if (!arg[10] || *end || nr_threads < 0)
1593 usage(index_pack_usage);
1594 #ifdef NO_PTHREADS
1595 if (nr_threads != 1)
1596 warning(_("no threads support, "
1597 "ignoring %s"), arg);
1598 nr_threads = 1;
1599 #endif
1600 } else if (starts_with(arg, "--pack_header=")) {
1601 struct pack_header *hdr;
1602 char *c;
1603
1604 hdr = (struct pack_header *)input_buffer;
1605 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1606 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1607 if (*c != ',')
1608 die(_("bad %s"), arg);
1609 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1610 if (*c)
1611 die(_("bad %s"), arg);
1612 input_len = sizeof(*hdr);
1613 } else if (!strcmp(arg, "-v")) {
1614 verbose = 1;
1615 } else if (!strcmp(arg, "-o")) {
1616 if (index_name || (i+1) >= argc)
1617 usage(index_pack_usage);
1618 index_name = argv[++i];
1619 } else if (starts_with(arg, "--index-version=")) {
1620 char *c;
1621 opts.version = strtoul(arg + 16, &c, 10);
1622 if (opts.version > 2)
1623 die(_("bad %s"), arg);
1624 if (*c == ',')
1625 opts.off32_limit = strtoul(c+1, &c, 0);
1626 if (*c || opts.off32_limit & 0x80000000)
1627 die(_("bad %s"), arg);
1628 } else
1629 usage(index_pack_usage);
1630 continue;
1631 }
1632
1633 if (pack_name)
1634 usage(index_pack_usage);
1635 pack_name = arg;
1636 }
1637
1638 if (!pack_name && !from_stdin)
1639 usage(index_pack_usage);
1640 if (fix_thin_pack && !from_stdin)
1641 die(_("--fix-thin cannot be used without --stdin"));
1642 if (!index_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(&index_name_buf, pack_name, len);
1648 strbuf_addstr(&index_name_buf, ".idx");
1649 index_name = index_name_buf.buf;
1650 }
1651 if (keep_msg && !keep_name && pack_name) {
1652 size_t len;
1653 if (!strip_suffix(pack_name, ".pack", &len))
1654 die(_("packfile name '%s' does not end with '.pack'"),
1655 pack_name);
1656 strbuf_add(&keep_name_buf, pack_name, len);
1657 strbuf_addstr(&keep_name_buf, ".idx");
1658 keep_name = keep_name_buf.buf;
1659 }
1660 if (verify) {
1661 if (!index_name)
1662 die(_("--verify with no packfile name given"));
1663 read_idx_option(&opts, index_name);
1664 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1665 }
1666 if (strict)
1667 opts.flags |= WRITE_IDX_STRICT;
1668
1669 #ifndef NO_PTHREADS
1670 if (!nr_threads) {
1671 nr_threads = online_cpus();
1672 /* An experiment showed that more threads does not mean faster */
1673 if (nr_threads > 3)
1674 nr_threads = 3;
1675 }
1676 #endif
1677
1678 curr_pack = open_pack_file(pack_name);
1679 parse_pack_header();
1680 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1681 if (show_stat)
1682 obj_stat = xcalloc(nr_objects + 1, sizeof(struct object_stat));
1683 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1684 parse_pack_objects(pack_sha1);
1685 resolve_deltas();
1686 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1687 free(deltas);
1688 if (strict)
1689 foreign_nr = check_objects();
1690
1691 if (show_stat)
1692 show_pack_info(stat_only);
1693
1694 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1695 for (i = 0; i < nr_objects; i++)
1696 idx_objects[i] = &objects[i].idx;
1697 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1698 free(idx_objects);
1699
1700 if (!verify)
1701 final(pack_name, curr_pack,
1702 index_name, curr_index,
1703 keep_name, keep_msg,
1704 pack_sha1);
1705 else
1706 close(input_fd);
1707 free(objects);
1708 strbuf_release(&index_name_buf);
1709 strbuf_release(&keep_name_buf);
1710 if (pack_name == NULL)
1711 free((void *) curr_pack);
1712 if (index_name == NULL)
1713 free((void *) curr_index);
1714
1715 /*
1716 * Let the caller know this pack is not self contained
1717 */
1718 if (check_self_contained_and_connected && foreign_nr)
1719 return 1;
1720
1721 return 0;
1722 }
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