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 "thread-utils.h"
13static const char index_pack_usage[] =
15"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
16struct object_entry {
18 struct pack_idx_entry idx;
19 unsigned long size;
20 unsigned int hdr_size;
21 enum object_type type;
22 enum object_type real_type;
23 unsigned delta_depth;
24 int base_object_no;
25};
26union delta_base {
28 unsigned char sha1[20];
29 off_t offset;
30};
31struct base_data {
33 struct base_data *base;
34 struct base_data *child;
35 struct object_entry *obj;
36 void *data;
37 unsigned long size;
38 int ref_first, ref_last;
39 int ofs_first, ofs_last;
40};
41#if !defined(NO_PTHREADS) && defined(NO_PREAD)
43/* NO_PREAD uses compat/pread.c, which is not thread-safe. Disable threading. */
44#define NO_PTHREADS
45#endif
46struct thread_local {
48#ifndef NO_PTHREADS
49 pthread_t thread;
50#endif
51 struct base_data *base_cache;
52 size_t base_cache_used;
53};
54/*
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#define FLAG_LINK (1u<<20)
62#define FLAG_CHECKED (1u<<21)
63struct delta_entry {
65 union delta_base base;
66 int obj_no;
67};
68static struct object_entry *objects;
70static struct delta_entry *deltas;
71static struct thread_local nothread_data;
72static int nr_objects;
73static int nr_deltas;
74static int nr_resolved_deltas;
75static int nr_threads;
76static int from_stdin;
78static int strict;
79static int verbose;
80static struct progress *progress;
82/* We always read in 4kB chunks. */
84static unsigned char input_buffer[4096];
85static unsigned int input_offset, input_len;
86static off_t consumed_bytes;
87static unsigned deepest_delta;
88static git_SHA_CTX input_ctx;
89static uint32_t input_crc32;
90static int input_fd, output_fd, pack_fd;
91#ifndef NO_PTHREADS
93static struct thread_local *thread_data;
95static int nr_dispatched;
96static int threads_active;
97static pthread_mutex_t read_mutex;
99#define read_lock() lock_mutex(&read_mutex)
100#define read_unlock() unlock_mutex(&read_mutex)
101static pthread_mutex_t counter_mutex;
103#define counter_lock() lock_mutex(&counter_mutex)
104#define counter_unlock() unlock_mutex(&counter_mutex)
105static pthread_mutex_t work_mutex;
107#define work_lock() lock_mutex(&work_mutex)
108#define work_unlock() unlock_mutex(&work_mutex)
109static pthread_key_t key;
111static inline void lock_mutex(pthread_mutex_t *mutex)
113{
114 if (threads_active)
115 pthread_mutex_lock(mutex);
116}
117static inline void unlock_mutex(pthread_mutex_t *mutex)
119{
120 if (threads_active)
121 pthread_mutex_unlock(mutex);
122}
123/*
125 * Mutex and conditional variable can't be statically-initialized on Windows.
126 */
127static void init_thread(void)
128{
129 init_recursive_mutex(&read_mutex);
130 pthread_mutex_init(&counter_mutex, NULL);
131 pthread_mutex_init(&work_mutex, NULL);
132 pthread_key_create(&key, NULL);
133 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
134 threads_active = 1;
135}
136static void cleanup_thread(void)
138{
139 if (!threads_active)
140 return;
141 threads_active = 0;
142 pthread_mutex_destroy(&read_mutex);
143 pthread_mutex_destroy(&counter_mutex);
144 pthread_mutex_destroy(&work_mutex);
145 pthread_key_delete(key);
146 free(thread_data);
147}
148#else
150#define read_lock()
152#define read_unlock()
153#define counter_lock()
155#define counter_unlock()
156#define work_lock()
158#define work_unlock()
159#endif
161static int mark_link(struct object *obj, int type, void *data)
164{
165 if (!obj)
166 return -1;
167 if (type != OBJ_ANY && obj->type != type)
169 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
170 obj->flags |= FLAG_LINK;
172 return 0;
173}
174/* The content of each linked object must have been checked
176 or it must be already present in the object database */
177static void check_object(struct object *obj)
178{
179 if (!obj)
180 return;
181 if (!(obj->flags & FLAG_LINK))
183 return;
184 if (!(obj->flags & FLAG_CHECKED)) {
186 unsigned long size;
187 int type = sha1_object_info(obj->sha1, &size);
188 if (type != obj->type || type <= 0)
189 die(_("object of unexpected type"));
190 obj->flags |= FLAG_CHECKED;
191 return;
192 }
193}
194static void check_objects(void)
196{
197 unsigned i, max;
198 max = get_max_object_index();
200 for (i = 0; i < max; i++)
201 check_object(get_indexed_object(i));
202}
203/* Discard current buffer used content. */
206static void flush(void)
207{
208 if (input_offset) {
209 if (output_fd >= 0)
210 write_or_die(output_fd, input_buffer, input_offset);
211 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
212 memmove(input_buffer, input_buffer + input_offset, input_len);
213 input_offset = 0;
214 }
215}
216/*
218 * Make sure at least "min" bytes are available in the buffer, and
219 * return the pointer to the buffer.
220 */
221static void *fill(int min)
222{
223 if (min <= input_len)
224 return input_buffer + input_offset;
225 if (min > sizeof(input_buffer))
226 die(Q_("cannot fill %d byte",
227 "cannot fill %d bytes",
228 min),
229 min);
230 flush();
231 do {
232 ssize_t ret = xread(input_fd, input_buffer + input_len,
233 sizeof(input_buffer) - input_len);
234 if (ret <= 0) {
235 if (!ret)
236 die(_("early EOF"));
237 die_errno(_("read error on input"));
238 }
239 input_len += ret;
240 if (from_stdin)
241 display_throughput(progress, consumed_bytes + input_len);
242 } while (input_len < min);
243 return input_buffer;
244}
245static void use(int bytes)
247{
248 if (bytes > input_len)
249 die(_("used more bytes than were available"));
250 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
251 input_len -= bytes;
252 input_offset += bytes;
253 /* make sure off_t is sufficiently large not to wrap */
255 if (signed_add_overflows(consumed_bytes, bytes))
256 die(_("pack too large for current definition of off_t"));
257 consumed_bytes += bytes;
258}
259static const char *open_pack_file(const char *pack_name)
261{
262 if (from_stdin) {
263 input_fd = 0;
264 if (!pack_name) {
265 static char tmp_file[PATH_MAX];
266 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
267 "pack/tmp_pack_XXXXXX");
268 pack_name = xstrdup(tmp_file);
269 } else
270 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
271 if (output_fd < 0)
272 die_errno(_("unable to create '%s'"), pack_name);
273 pack_fd = output_fd;
274 } else {
275 input_fd = open(pack_name, O_RDONLY);
276 if (input_fd < 0)
277 die_errno(_("cannot open packfile '%s'"), pack_name);
278 output_fd = -1;
279 pack_fd = input_fd;
280 }
281 git_SHA1_Init(&input_ctx);
282 return pack_name;
283}
284static void parse_pack_header(void)
286{
287 struct pack_header *hdr = fill(sizeof(struct pack_header));
288 /* Header consistency check */
290 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
291 die(_("pack signature mismatch"));
292 if (!pack_version_ok(hdr->hdr_version))
293 die("pack version %"PRIu32" unsupported",
294 ntohl(hdr->hdr_version));
295 nr_objects = ntohl(hdr->hdr_entries);
297 use(sizeof(struct pack_header));
298}
299static NORETURN void bad_object(unsigned long offset, const char *format,
301 ...) __attribute__((format (printf, 2, 3)));
302static NORETURN void bad_object(unsigned long offset, const char *format, ...)
304{
305 va_list params;
306 char buf[1024];
307 va_start(params, format);
309 vsnprintf(buf, sizeof(buf), format, params);
310 va_end(params);
311 die(_("pack has bad object at offset %lu: %s"), offset, buf);
312}
313static inline struct thread_local *get_thread_data(void)
315{
316#ifndef NO_PTHREADS
317 if (threads_active)
318 return pthread_getspecific(key);
319 assert(!threads_active &&
320 "This should only be reached when all threads are gone");
321#endif
322 return ¬hread_data;
323}
324#ifndef NO_PTHREADS
326static void set_thread_data(struct thread_local *data)
327{
328 if (threads_active)
329 pthread_setspecific(key, data);
330}
331#endif
332static struct base_data *alloc_base_data(void)
334{
335 struct base_data *base = xmalloc(sizeof(struct base_data));
336 memset(base, 0, sizeof(*base));
337 base->ref_last = -1;
338 base->ofs_last = -1;
339 return base;
340}
341static void free_base_data(struct base_data *c)
343{
344 if (c->data) {
345 free(c->data);
346 c->data = NULL;
347 get_thread_data()->base_cache_used -= c->size;
348 }
349}
350static void prune_base_data(struct base_data *retain)
352{
353 struct base_data *b;
354 struct thread_local *data = get_thread_data();
355 for (b = data->base_cache;
356 data->base_cache_used > delta_base_cache_limit && b;
357 b = b->child) {
358 if (b->data && b != retain)
359 free_base_data(b);
360 }
361}
362static void link_base_data(struct base_data *base, struct base_data *c)
364{
365 if (base)
366 base->child = c;
367 else
368 get_thread_data()->base_cache = c;
369 c->base = base;
371 c->child = NULL;
372 if (c->data)
373 get_thread_data()->base_cache_used += c->size;
374 prune_base_data(c);
375}
376static void unlink_base_data(struct base_data *c)
378{
379 struct base_data *base = c->base;
380 if (base)
381 base->child = NULL;
382 else
383 get_thread_data()->base_cache = NULL;
384 free_base_data(c);
385}
386static int is_delta_type(enum object_type type)
388{
389 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
390}
391static void *unpack_entry_data(unsigned long offset, unsigned long size,
393 enum object_type type, unsigned char *sha1)
394{
395 static char fixed_buf[8192];
396 int status;
397 git_zstream stream;
398 void *buf;
399 git_SHA_CTX c;
400 char hdr[32];
401 int hdrlen;
402 if (!is_delta_type(type)) {
404 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
405 git_SHA1_Init(&c);
406 git_SHA1_Update(&c, hdr, hdrlen);
407 } else
408 sha1 = NULL;
409 if (type == OBJ_BLOB && size > big_file_threshold)
410 buf = fixed_buf;
411 else
412 buf = xmalloc(size);
413 memset(&stream, 0, sizeof(stream));
415 git_inflate_init(&stream);
416 stream.next_out = buf;
417 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
418 do {
420 unsigned char *last_out = stream.next_out;
421 stream.next_in = fill(1);
422 stream.avail_in = input_len;
423 status = git_inflate(&stream, 0);
424 use(input_len - stream.avail_in);
425 if (sha1)
426 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
427 if (buf == fixed_buf) {
428 stream.next_out = buf;
429 stream.avail_out = sizeof(fixed_buf);
430 }
431 } while (status == Z_OK);
432 if (stream.total_out != size || status != Z_STREAM_END)
433 bad_object(offset, _("inflate returned %d"), status);
434 git_inflate_end(&stream);
435 if (sha1)
436 git_SHA1_Final(sha1, &c);
437 return buf == fixed_buf ? NULL : buf;
438}
439static void *unpack_raw_entry(struct object_entry *obj,
441 union delta_base *delta_base,
442 unsigned char *sha1)
443{
444 unsigned char *p;
445 unsigned long size, c;
446 off_t base_offset;
447 unsigned shift;
448 void *data;
449 obj->idx.offset = consumed_bytes;
451 input_crc32 = crc32(0, NULL, 0);
452 p = fill(1);
454 c = *p;
455 use(1);
456 obj->type = (c >> 4) & 7;
457 size = (c & 15);
458 shift = 4;
459 while (c & 0x80) {
460 p = fill(1);
461 c = *p;
462 use(1);
463 size += (c & 0x7f) << shift;
464 shift += 7;
465 }
466 obj->size = size;
467 switch (obj->type) {
469 case OBJ_REF_DELTA:
470 hashcpy(delta_base->sha1, fill(20));
471 use(20);
472 break;
473 case OBJ_OFS_DELTA:
474 memset(delta_base, 0, sizeof(*delta_base));
475 p = fill(1);
476 c = *p;
477 use(1);
478 base_offset = c & 127;
479 while (c & 128) {
480 base_offset += 1;
481 if (!base_offset || MSB(base_offset, 7))
482 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
483 p = fill(1);
484 c = *p;
485 use(1);
486 base_offset = (base_offset << 7) + (c & 127);
487 }
488 delta_base->offset = obj->idx.offset - base_offset;
489 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
490 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
491 break;
492 case OBJ_COMMIT:
493 case OBJ_TREE:
494 case OBJ_BLOB:
495 case OBJ_TAG:
496 break;
497 default:
498 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
499 }
500 obj->hdr_size = consumed_bytes - obj->idx.offset;
501 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
503 obj->idx.crc32 = input_crc32;
504 return data;
505}
506static void *unpack_data(struct object_entry *obj,
508 int (*consume)(const unsigned char *, unsigned long, void *),
509 void *cb_data)
510{
511 off_t from = obj[0].idx.offset + obj[0].hdr_size;
512 unsigned long len = obj[1].idx.offset - from;
513 unsigned char *data, *inbuf;
514 git_zstream stream;
515 int status;
516 data = xmalloc(consume ? 64*1024 : obj->size);
518 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
519 memset(&stream, 0, sizeof(stream));
521 git_inflate_init(&stream);
522 stream.next_out = data;
523 stream.avail_out = consume ? 64*1024 : obj->size;
524 do {
526 unsigned char *last_out = stream.next_out;
527 ssize_t n = (len < 64*1024) ? len : 64*1024;
528 n = pread(pack_fd, inbuf, n, from);
529 if (n < 0)
530 die_errno(_("cannot pread pack file"));
531 if (!n)
532 die(Q_("premature end of pack file, %lu byte missing",
533 "premature end of pack file, %lu bytes missing",
534 len),
535 len);
536 from += n;
537 len -= n;
538 stream.next_in = inbuf;
539 stream.avail_in = n;
540 status = git_inflate(&stream, 0);
541 if (consume) {
542 if (consume(last_out, stream.next_out - last_out, cb_data)) {
543 free(inbuf);
544 free(data);
545 return NULL;
546 }
547 stream.next_out = data;
548 stream.avail_out = 64*1024;
549 }
550 } while (len && status == Z_OK && !stream.avail_in);
551 /* This has been inflated OK when first encountered, so... */
553 if (status != Z_STREAM_END || stream.total_out != obj->size)
554 die(_("serious inflate inconsistency"));
555 git_inflate_end(&stream);
557 free(inbuf);
558 if (consume) {
559 free(data);
560 data = NULL;
561 }
562 return data;
563}
564static void *get_data_from_pack(struct object_entry *obj)
566{
567 return unpack_data(obj, NULL, NULL);
568}
569static int compare_delta_bases(const union delta_base *base1,
571 const union delta_base *base2,
572 enum object_type type1,
573 enum object_type type2)
574{
575 int cmp = type1 - type2;
576 if (cmp)
577 return cmp;
578 return memcmp(base1, base2, UNION_BASE_SZ);
579}
580static int find_delta(const union delta_base *base, enum object_type type)
582{
583 int first = 0, last = nr_deltas;
584 while (first < last) {
586 int next = (first + last) / 2;
587 struct delta_entry *delta = &deltas[next];
588 int cmp;
589 cmp = compare_delta_bases(base, &delta->base,
591 type, objects[delta->obj_no].type);
592 if (!cmp)
593 return next;
594 if (cmp < 0) {
595 last = next;
596 continue;
597 }
598 first = next+1;
599 }
600 return -first-1;
601}
602static void find_delta_children(const union delta_base *base,
604 int *first_index, int *last_index,
605 enum object_type type)
606{
607 int first = find_delta(base, type);
608 int last = first;
609 int end = nr_deltas - 1;
610 if (first < 0) {
612 *first_index = 0;
613 *last_index = -1;
614 return;
615 }
616 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
617 --first;
618 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
619 ++last;
620 *first_index = first;
621 *last_index = last;
622}
623static void sha1_object(const void *data, struct object_entry *obj_entry,
625 unsigned long size, enum object_type type,
626 const unsigned char *sha1)
627{
628 void *new_data = NULL;
629 assert(data || obj_entry);
631 read_lock();
633 if (has_sha1_file(sha1)) {
634 void *has_data;
635 enum object_type has_type;
636 unsigned long has_size;
637 if (!data)
638 data = new_data = get_data_from_pack(obj_entry);
639 has_data = read_sha1_file(sha1, &has_type, &has_size);
640 read_unlock();
641 if (!has_data)
642 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
643 if (size != has_size || type != has_type ||
644 memcmp(data, has_data, size) != 0)
645 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
646 free(has_data);
647 } else
648 read_unlock();
649 if (strict) {
651 read_lock();
652 if (type == OBJ_BLOB) {
653 struct blob *blob = lookup_blob(sha1);
654 if (blob)
655 blob->object.flags |= FLAG_CHECKED;
656 else
657 die(_("invalid blob object %s"), sha1_to_hex(sha1));
658 } else {
659 struct object *obj;
660 int eaten;
661 void *buf = (void *) data;
662 if (!buf)
664 buf = new_data = get_data_from_pack(obj_entry);
665 /*
667 * we do not need to free the memory here, as the
668 * buf is deleted by the caller.
669 */
670 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
671 if (!obj)
672 die(_("invalid %s"), typename(type));
673 if (fsck_object(obj, 1, fsck_error_function))
674 die(_("Error in object"));
675 if (fsck_walk(obj, mark_link, NULL))
676 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
677 if (obj->type == OBJ_TREE) {
679 struct tree *item = (struct tree *) obj;
680 item->buffer = NULL;
681 }
682 if (obj->type == OBJ_COMMIT) {
683 struct commit *commit = (struct commit *) obj;
684 commit->buffer = NULL;
685 }
686 obj->flags |= FLAG_CHECKED;
687 }
688 read_unlock();
689 }
690 free(new_data);
692}
693/*
695 * This function is part of find_unresolved_deltas(). There are two
696 * walkers going in the opposite ways.
697 *
698 * The first one in find_unresolved_deltas() traverses down from
699 * parent node to children, deflating nodes along the way. However,
700 * memory for deflated nodes is limited by delta_base_cache_limit, so
701 * at some point parent node's deflated content may be freed.
702 *
703 * The second walker is this function, which goes from current node up
704 * to top parent if necessary to deflate the node. In normal
705 * situation, its parent node would be already deflated, so it just
706 * needs to apply delta.
707 *
708 * In the worst case scenario, parent node is no longer deflated because
709 * we're running out of delta_base_cache_limit; we need to re-deflate
710 * parents, possibly up to the top base.
711 *
712 * All deflated objects here are subject to be freed if we exceed
713 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
714 * just need to make sure the last node is not freed.
715 */
716static void *get_base_data(struct base_data *c)
717{
718 if (!c->data) {
719 struct object_entry *obj = c->obj;
720 struct base_data **delta = NULL;
721 int delta_nr = 0, delta_alloc = 0;
722 while (is_delta_type(c->obj->type) && !c->data) {
724 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
725 delta[delta_nr++] = c;
726 c = c->base;
727 }
728 if (!delta_nr) {
729 c->data = get_data_from_pack(obj);
730 c->size = obj->size;
731 get_thread_data()->base_cache_used += c->size;
732 prune_base_data(c);
733 }
734 for (; delta_nr > 0; delta_nr--) {
735 void *base, *raw;
736 c = delta[delta_nr - 1];
737 obj = c->obj;
738 base = get_base_data(c->base);
739 raw = get_data_from_pack(obj);
740 c->data = patch_delta(
741 base, c->base->size,
742 raw, obj->size,
743 &c->size);
744 free(raw);
745 if (!c->data)
746 bad_object(obj->idx.offset, _("failed to apply delta"));
747 get_thread_data()->base_cache_used += c->size;
748 prune_base_data(c);
749 }
750 free(delta);
751 }
752 return c->data;
753}
754static void resolve_delta(struct object_entry *delta_obj,
756 struct base_data *base, struct base_data *result)
757{
758 void *base_data, *delta_data;
759 delta_obj->real_type = base->obj->real_type;
761 delta_obj->delta_depth = base->obj->delta_depth + 1;
762 if (deepest_delta < delta_obj->delta_depth)
763 deepest_delta = delta_obj->delta_depth;
764 delta_obj->base_object_no = base->obj - objects;
765 delta_data = get_data_from_pack(delta_obj);
766 base_data = get_base_data(base);
767 result->obj = delta_obj;
768 result->data = patch_delta(base_data, base->size,
769 delta_data, delta_obj->size, &result->size);
770 free(delta_data);
771 if (!result->data)
772 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
773 hash_sha1_file(result->data, result->size,
774 typename(delta_obj->real_type), delta_obj->idx.sha1);
775 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
776 delta_obj->idx.sha1);
777 counter_lock();
778 nr_resolved_deltas++;
779 counter_unlock();
780}
781static struct base_data *find_unresolved_deltas_1(struct base_data *base,
783 struct base_data *prev_base)
784{
785 if (base->ref_last == -1 && base->ofs_last == -1) {
786 union delta_base base_spec;
787 hashcpy(base_spec.sha1, base->obj->idx.sha1);
789 find_delta_children(&base_spec,
790 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
791 memset(&base_spec, 0, sizeof(base_spec));
793 base_spec.offset = base->obj->idx.offset;
794 find_delta_children(&base_spec,
795 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
796 if (base->ref_last == -1 && base->ofs_last == -1) {
798 free(base->data);
799 return NULL;
800 }
801 link_base_data(prev_base, base);
803 }
804 if (base->ref_first <= base->ref_last) {
806 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
807 struct base_data *result = alloc_base_data();
808 assert(child->real_type == OBJ_REF_DELTA);
810 resolve_delta(child, base, result);
811 if (base->ref_first == base->ref_last && base->ofs_last == -1)
812 free_base_data(base);
813 base->ref_first++;
815 return result;
816 }
817 if (base->ofs_first <= base->ofs_last) {
819 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
820 struct base_data *result = alloc_base_data();
821 assert(child->real_type == OBJ_OFS_DELTA);
823 resolve_delta(child, base, result);
824 if (base->ofs_first == base->ofs_last)
825 free_base_data(base);
826 base->ofs_first++;
828 return result;
829 }
830 unlink_base_data(base);
832 return NULL;
833}
834static void find_unresolved_deltas(struct base_data *base)
836{
837 struct base_data *new_base, *prev_base = NULL;
838 for (;;) {
839 new_base = find_unresolved_deltas_1(base, prev_base);
840 if (new_base) {
842 prev_base = base;
843 base = new_base;
844 } else {
845 free(base);
846 base = prev_base;
847 if (!base)
848 return;
849 prev_base = base->base;
850 }
851 }
852}
853static int compare_delta_entry(const void *a, const void *b)
855{
856 const struct delta_entry *delta_a = a;
857 const struct delta_entry *delta_b = b;
858 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
860 return compare_delta_bases(&delta_a->base, &delta_b->base,
861 objects[delta_a->obj_no].type,
862 objects[delta_b->obj_no].type);
863}
864static void resolve_base(struct object_entry *obj)
866{
867 struct base_data *base_obj = alloc_base_data();
868 base_obj->obj = obj;
869 base_obj->data = NULL;
870 find_unresolved_deltas(base_obj);
871}
872#ifndef NO_PTHREADS
874static void *threaded_second_pass(void *data)
875{
876 set_thread_data(data);
877 for (;;) {
878 int i;
879 work_lock();
880 display_progress(progress, nr_resolved_deltas);
881 while (nr_dispatched < nr_objects &&
882 is_delta_type(objects[nr_dispatched].type))
883 nr_dispatched++;
884 if (nr_dispatched >= nr_objects) {
885 work_unlock();
886 break;
887 }
888 i = nr_dispatched++;
889 work_unlock();
890 resolve_base(&objects[i]);
892 }
893 return NULL;
894}
895#endif
896/*
898 * First pass:
899 * - find locations of all objects;
900 * - calculate SHA1 of all non-delta objects;
901 * - remember base (SHA1 or offset) for all deltas.
902 */
903static void parse_pack_objects(unsigned char *sha1)
904{
905 int i, nr_delays = 0;
906 struct delta_entry *delta = deltas;
907 struct stat st;
908 if (verbose)
910 progress = start_progress(
911 from_stdin ? _("Receiving objects") : _("Indexing objects"),
912 nr_objects);
913 for (i = 0; i < nr_objects; i++) {
914 struct object_entry *obj = &objects[i];
915 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
916 obj->real_type = obj->type;
917 if (is_delta_type(obj->type)) {
918 nr_deltas++;
919 delta->obj_no = i;
920 delta++;
921 } else if (!data) {
922 /* large blobs, check later */
923 obj->real_type = OBJ_BAD;
924 nr_delays++;
925 } else
926 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
927 free(data);
928 display_progress(progress, i+1);
929 }
930 objects[i].idx.offset = consumed_bytes;
931 stop_progress(&progress);
932 /* Check pack integrity */
934 flush();
935 git_SHA1_Final(sha1, &input_ctx);
936 if (hashcmp(fill(20), sha1))
937 die(_("pack is corrupted (SHA1 mismatch)"));
938 use(20);
939 /* If input_fd is a file, we should have reached its end now. */
941 if (fstat(input_fd, &st))
942 die_errno(_("cannot fstat packfile"));
943 if (S_ISREG(st.st_mode) &&
944 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
945 die(_("pack has junk at the end"));
946 for (i = 0; i < nr_objects; i++) {
948 struct object_entry *obj = &objects[i];
949 if (obj->real_type != OBJ_BAD)
950 continue;
951 obj->real_type = obj->type;
952 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
953 nr_delays--;
954 }
955 if (nr_delays)
956 die(_("confusion beyond insanity in parse_pack_objects()"));
957}
958/*
960 * Second pass:
961 * - for all non-delta objects, look if it is used as a base for
962 * deltas;
963 * - if used as a base, uncompress the object and apply all deltas,
964 * recursively checking if the resulting object is used as a base
965 * for some more deltas.
966 */
967static void resolve_deltas(void)
968{
969 int i;
970 if (!nr_deltas)
972 return;
973 /* Sort deltas by base SHA1/offset for fast searching */
975 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
976 compare_delta_entry);
977 if (verbose)
979 progress = start_progress(_("Resolving deltas"), nr_deltas);
980#ifndef NO_PTHREADS
982 nr_dispatched = 0;
983 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
984 init_thread();
985 for (i = 0; i < nr_threads; i++) {
986 int ret = pthread_create(&thread_data[i].thread, NULL,
987 threaded_second_pass, thread_data + i);
988 if (ret)
989 die("unable to create thread: %s", strerror(ret));
990 }
991 for (i = 0; i < nr_threads; i++)
992 pthread_join(thread_data[i].thread, NULL);
993 cleanup_thread();
994 return;
995 }
996#endif
997 for (i = 0; i < nr_objects; i++) {
999 struct object_entry *obj = &objects[i];
1000 if (is_delta_type(obj->type))
1002 continue;
1003 resolve_base(obj);
1004 display_progress(progress, nr_resolved_deltas);
1005 }
1006}
1007/*
1009 * Third pass:
1010 * - append objects to convert thin pack to full pack if required
1011 * - write the final 20-byte SHA-1
1012 */
1013static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1014static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1015{
1016 if (nr_deltas == nr_resolved_deltas) {
1017 stop_progress(&progress);
1018 /* Flush remaining pack final 20-byte SHA1. */
1019 flush();
1020 return;
1021 }
1022 if (fix_thin_pack) {
1024 struct sha1file *f;
1025 unsigned char read_sha1[20], tail_sha1[20];
1026 char msg[48];
1027 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1028 int nr_objects_initial = nr_objects;
1029 if (nr_unresolved <= 0)
1030 die(_("confusion beyond insanity"));
1031 objects = xrealloc(objects,
1032 (nr_objects + nr_unresolved + 1)
1033 * sizeof(*objects));
1034 f = sha1fd(output_fd, curr_pack);
1035 fix_unresolved_deltas(f, nr_unresolved);
1036 sprintf(msg, "completed with %d local objects",
1037 nr_objects - nr_objects_initial);
1038 stop_progress_msg(&progress, msg);
1039 sha1close(f, tail_sha1, 0);
1040 hashcpy(read_sha1, pack_sha1);
1041 fixup_pack_header_footer(output_fd, pack_sha1,
1042 curr_pack, nr_objects,
1043 read_sha1, consumed_bytes-20);
1044 if (hashcmp(read_sha1, tail_sha1) != 0)
1045 die("Unexpected tail checksum for %s "
1046 "(disk corruption?)", curr_pack);
1047 }
1048 if (nr_deltas != nr_resolved_deltas)
1049 die(Q_("pack has %d unresolved delta",
1050 "pack has %d unresolved deltas",
1051 nr_deltas - nr_resolved_deltas),
1052 nr_deltas - nr_resolved_deltas);
1053}
1054static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1056{
1057 git_zstream stream;
1058 int status;
1059 unsigned char outbuf[4096];
1060 memset(&stream, 0, sizeof(stream));
1062 git_deflate_init(&stream, zlib_compression_level);
1063 stream.next_in = in;
1064 stream.avail_in = size;
1065 do {
1067 stream.next_out = outbuf;
1068 stream.avail_out = sizeof(outbuf);
1069 status = git_deflate(&stream, Z_FINISH);
1070 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1071 } while (status == Z_OK);
1072 if (status != Z_STREAM_END)
1074 die(_("unable to deflate appended object (%d)"), status);
1075 size = stream.total_out;
1076 git_deflate_end(&stream);
1077 return size;
1078}
1079static struct object_entry *append_obj_to_pack(struct sha1file *f,
1081 const unsigned char *sha1, void *buf,
1082 unsigned long size, enum object_type type)
1083{
1084 struct object_entry *obj = &objects[nr_objects++];
1085 unsigned char header[10];
1086 unsigned long s = size;
1087 int n = 0;
1088 unsigned char c = (type << 4) | (s & 15);
1089 s >>= 4;
1090 while (s) {
1091 header[n++] = c | 0x80;
1092 c = s & 0x7f;
1093 s >>= 7;
1094 }
1095 header[n++] = c;
1096 crc32_begin(f);
1097 sha1write(f, header, n);
1098 obj[0].size = size;
1099 obj[0].hdr_size = n;
1100 obj[0].type = type;
1101 obj[0].real_type = type;
1102 obj[1].idx.offset = obj[0].idx.offset + n;
1103 obj[1].idx.offset += write_compressed(f, buf, size);
1104 obj[0].idx.crc32 = crc32_end(f);
1105 sha1flush(f);
1106 hashcpy(obj->idx.sha1, sha1);
1107 return obj;
1108}
1109static int delta_pos_compare(const void *_a, const void *_b)
1111{
1112 struct delta_entry *a = *(struct delta_entry **)_a;
1113 struct delta_entry *b = *(struct delta_entry **)_b;
1114 return a->obj_no - b->obj_no;
1115}
1116static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1118{
1119 struct delta_entry **sorted_by_pos;
1120 int i, n = 0;
1121 /*
1123 * Since many unresolved deltas may well be themselves base objects
1124 * for more unresolved deltas, we really want to include the
1125 * smallest number of base objects that would cover as much delta
1126 * as possible by picking the
1127 * trunc deltas first, allowing for other deltas to resolve without
1128 * additional base objects. Since most base objects are to be found
1129 * before deltas depending on them, a good heuristic is to start
1130 * resolving deltas in the same order as their position in the pack.
1131 */
1132 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1133 for (i = 0; i < nr_deltas; i++) {
1134 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1135 continue;
1136 sorted_by_pos[n++] = &deltas[i];
1137 }
1138 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1139 for (i = 0; i < n; i++) {
1141 struct delta_entry *d = sorted_by_pos[i];
1142 enum object_type type;
1143 struct base_data *base_obj = alloc_base_data();
1144 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1146 continue;
1147 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1148 if (!base_obj->data)
1149 continue;
1150 if (check_sha1_signature(d->base.sha1, base_obj->data,
1152 base_obj->size, typename(type)))
1153 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1154 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1155 base_obj->data, base_obj->size, type);
1156 find_unresolved_deltas(base_obj);
1157 display_progress(progress, nr_resolved_deltas);
1158 }
1159 free(sorted_by_pos);
1160}
1161static void final(const char *final_pack_name, const char *curr_pack_name,
1163 const char *final_index_name, const char *curr_index_name,
1164 const char *keep_name, const char *keep_msg,
1165 unsigned char *sha1)
1166{
1167 const char *report = "pack";
1168 char name[PATH_MAX];
1169 int err;
1170 if (!from_stdin) {
1172 close(input_fd);
1173 } else {
1174 fsync_or_die(output_fd, curr_pack_name);
1175 err = close(output_fd);
1176 if (err)
1177 die_errno(_("error while closing pack file"));
1178 }
1179 if (keep_msg) {
1181 int keep_fd, keep_msg_len = strlen(keep_msg);
1182 if (!keep_name)
1184 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1185 else
1186 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1187 if (keep_fd < 0) {
1189 if (errno != EEXIST)
1190 die_errno(_("cannot write keep file '%s'"),
1191 keep_name);
1192 } else {
1193 if (keep_msg_len > 0) {
1194 write_or_die(keep_fd, keep_msg, keep_msg_len);
1195 write_or_die(keep_fd, "\n", 1);
1196 }
1197 if (close(keep_fd) != 0)
1198 die_errno(_("cannot close written keep file '%s'"),
1199 keep_name);
1200 report = "keep";
1201 }
1202 }
1203 if (final_pack_name != curr_pack_name) {
1205 if (!final_pack_name) {
1206 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1207 get_object_directory(), sha1_to_hex(sha1));
1208 final_pack_name = name;
1209 }
1210 if (move_temp_to_file(curr_pack_name, final_pack_name))
1211 die(_("cannot store pack file"));
1212 } else if (from_stdin)
1213 chmod(final_pack_name, 0444);
1214 if (final_index_name != curr_index_name) {
1216 if (!final_index_name) {
1217 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1218 get_object_directory(), sha1_to_hex(sha1));
1219 final_index_name = name;
1220 }
1221 if (move_temp_to_file(curr_index_name, final_index_name))
1222 die(_("cannot store index file"));
1223 } else
1224 chmod(final_index_name, 0444);
1225 if (!from_stdin) {
1227 printf("%s\n", sha1_to_hex(sha1));
1228 } else {
1229 char buf[48];
1230 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1231 report, sha1_to_hex(sha1));
1232 write_or_die(1, buf, len);
1233 /*
1235 * Let's just mimic git-unpack-objects here and write
1236 * the last part of the input buffer to stdout.
1237 */
1238 while (input_len) {
1239 err = xwrite(1, input_buffer + input_offset, input_len);
1240 if (err <= 0)
1241 break;
1242 input_len -= err;
1243 input_offset += err;
1244 }
1245 }
1246}
1247static int git_index_pack_config(const char *k, const char *v, void *cb)
1249{
1250 struct pack_idx_option *opts = cb;
1251 if (!strcmp(k, "pack.indexversion")) {
1253 opts->version = git_config_int(k, v);
1254 if (opts->version > 2)
1255 die("bad pack.indexversion=%"PRIu32, opts->version);
1256 return 0;
1257 }
1258 if (!strcmp(k, "pack.threads")) {
1259 nr_threads = git_config_int(k, v);
1260 if (nr_threads < 0)
1261 die("invalid number of threads specified (%d)",
1262 nr_threads);
1263#ifdef NO_PTHREADS
1264 if (nr_threads != 1)
1265 warning("no threads support, ignoring %s", k);
1266 nr_threads = 1;
1267#endif
1268 return 0;
1269 }
1270 return git_default_config(k, v, cb);
1271}
1272static int cmp_uint32(const void *a_, const void *b_)
1274{
1275 uint32_t a = *((uint32_t *)a_);
1276 uint32_t b = *((uint32_t *)b_);
1277 return (a < b) ? -1 : (a != b);
1279}
1280static void read_v2_anomalous_offsets(struct packed_git *p,
1282 struct pack_idx_option *opts)
1283{
1284 const uint32_t *idx1, *idx2;
1285 uint32_t i;
1286 /* The address of the 4-byte offset table */
1288 idx1 = (((const uint32_t *)p->index_data)
1289 + 2 /* 8-byte header */
1290 + 256 /* fan out */
1291 + 5 * p->num_objects /* 20-byte SHA-1 table */
1292 + p->num_objects /* CRC32 table */
1293 );
1294 /* The address of the 8-byte offset table */
1296 idx2 = idx1 + p->num_objects;
1297 for (i = 0; i < p->num_objects; i++) {
1299 uint32_t off = ntohl(idx1[i]);
1300 if (!(off & 0x80000000))
1301 continue;
1302 off = off & 0x7fffffff;
1303 if (idx2[off * 2])
1304 continue;
1305 /*
1306 * The real offset is ntohl(idx2[off * 2]) in high 4
1307 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1308 * octets. But idx2[off * 2] is Zero!!!
1309 */
1310 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1311 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1312 }
1313 if (1 < opts->anomaly_nr)
1315 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1316}
1317static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1319{
1320 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1321 if (!p)
1323 die(_("Cannot open existing pack file '%s'"), pack_name);
1324 if (open_pack_index(p))
1325 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1326 /* Read the attributes from the existing idx file */
1328 opts->version = p->index_version;
1329 if (opts->version == 2)
1331 read_v2_anomalous_offsets(p, opts);
1332 /*
1334 * Get rid of the idx file as we do not need it anymore.
1335 * NEEDSWORK: extract this bit from free_pack_by_name() in
1336 * sha1_file.c, perhaps? It shouldn't matter very much as we
1337 * know we haven't installed this pack (hence we never have
1338 * read anything from it).
1339 */
1340 close_pack_index(p);
1341 free(p);
1342}
1343static void show_pack_info(int stat_only)
1345{
1346 int i, baseobjects = nr_objects - nr_deltas;
1347 unsigned long *chain_histogram = NULL;
1348 if (deepest_delta)
1350 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1351 for (i = 0; i < nr_objects; i++) {
1353 struct object_entry *obj = &objects[i];
1354 if (is_delta_type(obj->type))
1356 chain_histogram[obj->delta_depth - 1]++;
1357 if (stat_only)
1358 continue;
1359 printf("%s %-6s %lu %lu %"PRIuMAX,
1360 sha1_to_hex(obj->idx.sha1),
1361 typename(obj->real_type), obj->size,
1362 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1363 (uintmax_t)obj->idx.offset);
1364 if (is_delta_type(obj->type)) {
1365 struct object_entry *bobj = &objects[obj->base_object_no];
1366 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1367 }
1368 putchar('\n');
1369 }
1370 if (baseobjects)
1372 printf_ln(Q_("non delta: %d object",
1373 "non delta: %d objects",
1374 baseobjects),
1375 baseobjects);
1376 for (i = 0; i < deepest_delta; i++) {
1377 if (!chain_histogram[i])
1378 continue;
1379 printf_ln(Q_("chain length = %d: %lu object",
1380 "chain length = %d: %lu objects",
1381 chain_histogram[i]),
1382 i + 1,
1383 chain_histogram[i]);
1384 }
1385}
1386int cmd_index_pack(int argc, const char **argv, const char *prefix)
1388{
1389 int i, fix_thin_pack = 0, verify = 0, stat_only = 0, stat = 0;
1390 const char *curr_pack, *curr_index;
1391 const char *index_name = NULL, *pack_name = NULL;
1392 const char *keep_name = NULL, *keep_msg = NULL;
1393 char *index_name_buf = NULL, *keep_name_buf = NULL;
1394 struct pack_idx_entry **idx_objects;
1395 struct pack_idx_option opts;
1396 unsigned char pack_sha1[20];
1397 if (argc == 2 && !strcmp(argv[1], "-h"))
1399 usage(index_pack_usage);
1400 read_replace_refs = 0;
1402 reset_pack_idx_option(&opts);
1404 git_config(git_index_pack_config, &opts);
1405 if (prefix && chdir(prefix))
1406 die(_("Cannot come back to cwd"));
1407 for (i = 1; i < argc; i++) {
1409 const char *arg = argv[i];
1410 if (*arg == '-') {
1412 if (!strcmp(arg, "--stdin")) {
1413 from_stdin = 1;
1414 } else if (!strcmp(arg, "--fix-thin")) {
1415 fix_thin_pack = 1;
1416 } else if (!strcmp(arg, "--strict")) {
1417 strict = 1;
1418 } else if (!strcmp(arg, "--verify")) {
1419 verify = 1;
1420 } else if (!strcmp(arg, "--verify-stat")) {
1421 verify = 1;
1422 stat = 1;
1423 } else if (!strcmp(arg, "--verify-stat-only")) {
1424 verify = 1;
1425 stat = 1;
1426 stat_only = 1;
1427 } else if (!strcmp(arg, "--keep")) {
1428 keep_msg = "";
1429 } else if (!prefixcmp(arg, "--keep=")) {
1430 keep_msg = arg + 7;
1431 } else if (!prefixcmp(arg, "--threads=")) {
1432 char *end;
1433 nr_threads = strtoul(arg+10, &end, 0);
1434 if (!arg[10] || *end || nr_threads < 0)
1435 usage(index_pack_usage);
1436#ifdef NO_PTHREADS
1437 if (nr_threads != 1)
1438 warning("no threads support, "
1439 "ignoring %s", arg);
1440 nr_threads = 1;
1441#endif
1442 } else if (!prefixcmp(arg, "--pack_header=")) {
1443 struct pack_header *hdr;
1444 char *c;
1445 hdr = (struct pack_header *)input_buffer;
1447 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1448 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1449 if (*c != ',')
1450 die(_("bad %s"), arg);
1451 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1452 if (*c)
1453 die(_("bad %s"), arg);
1454 input_len = sizeof(*hdr);
1455 } else if (!strcmp(arg, "-v")) {
1456 verbose = 1;
1457 } else if (!strcmp(arg, "-o")) {
1458 if (index_name || (i+1) >= argc)
1459 usage(index_pack_usage);
1460 index_name = argv[++i];
1461 } else if (!prefixcmp(arg, "--index-version=")) {
1462 char *c;
1463 opts.version = strtoul(arg + 16, &c, 10);
1464 if (opts.version > 2)
1465 die(_("bad %s"), arg);
1466 if (*c == ',')
1467 opts.off32_limit = strtoul(c+1, &c, 0);
1468 if (*c || opts.off32_limit & 0x80000000)
1469 die(_("bad %s"), arg);
1470 } else
1471 usage(index_pack_usage);
1472 continue;
1473 }
1474 if (pack_name)
1476 usage(index_pack_usage);
1477 pack_name = arg;
1478 }
1479 if (!pack_name && !from_stdin)
1481 usage(index_pack_usage);
1482 if (fix_thin_pack && !from_stdin)
1483 die(_("--fix-thin cannot be used without --stdin"));
1484 if (!index_name && pack_name) {
1485 int len = strlen(pack_name);
1486 if (!has_extension(pack_name, ".pack"))
1487 die(_("packfile name '%s' does not end with '.pack'"),
1488 pack_name);
1489 index_name_buf = xmalloc(len);
1490 memcpy(index_name_buf, pack_name, len - 5);
1491 strcpy(index_name_buf + len - 5, ".idx");
1492 index_name = index_name_buf;
1493 }
1494 if (keep_msg && !keep_name && pack_name) {
1495 int len = strlen(pack_name);
1496 if (!has_extension(pack_name, ".pack"))
1497 die(_("packfile name '%s' does not end with '.pack'"),
1498 pack_name);
1499 keep_name_buf = xmalloc(len);
1500 memcpy(keep_name_buf, pack_name, len - 5);
1501 strcpy(keep_name_buf + len - 5, ".keep");
1502 keep_name = keep_name_buf;
1503 }
1504 if (verify) {
1505 if (!index_name)
1506 die(_("--verify with no packfile name given"));
1507 read_idx_option(&opts, index_name);
1508 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1509 }
1510 if (strict)
1511 opts.flags |= WRITE_IDX_STRICT;
1512#ifndef NO_PTHREADS
1514 if (!nr_threads) {
1515 nr_threads = online_cpus();
1516 /* An experiment showed that more threads does not mean faster */
1517 if (nr_threads > 3)
1518 nr_threads = 3;
1519 }
1520#endif
1521 curr_pack = open_pack_file(pack_name);
1523 parse_pack_header();
1524 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1525 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1526 parse_pack_objects(pack_sha1);
1527 resolve_deltas();
1528 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1529 free(deltas);
1530 if (strict)
1531 check_objects();
1532 if (stat)
1534 show_pack_info(stat_only);
1535 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1537 for (i = 0; i < nr_objects; i++)
1538 idx_objects[i] = &objects[i].idx;
1539 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1540 free(idx_objects);
1541 if (!verify)
1543 final(pack_name, curr_pack,
1544 index_name, curr_index,
1545 keep_name, keep_msg,
1546 pack_sha1);
1547 else
1548 close(input_fd);
1549 free(objects);
1550 free(index_name_buf);
1551 free(keep_name_buf);
1552 if (pack_name == NULL)
1553 free((void *) curr_pack);
1554 if (index_name == NULL)
1555 free((void *) curr_index);
1556 return 0;
1558}