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"
14static 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>])";
17struct object_entry {
19 struct pack_idx_entry idx;
20 unsigned long size;
21 unsigned int hdr_size;
22 enum object_type type;
23 enum object_type real_type;
24 unsigned delta_depth;
25 int base_object_no;
26};
27union delta_base {
29 unsigned char sha1[20];
30 off_t offset;
31};
32struct base_data {
34 struct base_data *base;
35 struct base_data *child;
36 struct object_entry *obj;
37 void *data;
38 unsigned long size;
39 int ref_first, ref_last;
40 int ofs_first, ofs_last;
41};
42#if !defined(NO_PTHREADS) && defined(NO_PREAD)
44/* NO_PREAD uses compat/pread.c, which is not thread-safe. Disable threading. */
45#define NO_PTHREADS
46#endif
47struct thread_local {
49#ifndef NO_PTHREADS
50 pthread_t thread;
51#endif
52 struct base_data *base_cache;
53 size_t base_cache_used;
54};
55/*
57 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
58 * to memcmp() only the first 20 bytes.
59 */
60#define UNION_BASE_SZ 20
61#define FLAG_LINK (1u<<20)
63#define FLAG_CHECKED (1u<<21)
64struct delta_entry {
66 union delta_base base;
67 int obj_no;
68};
69static struct object_entry *objects;
71static struct delta_entry *deltas;
72static struct thread_local nothread_data;
73static int nr_objects;
74static int nr_deltas;
75static int nr_resolved_deltas;
76static int nr_threads;
77static int from_stdin;
79static int strict;
80static int verbose;
81static struct progress *progress;
83/* We always read in 4kB chunks. */
85static unsigned char input_buffer[4096];
86static unsigned int input_offset, input_len;
87static off_t consumed_bytes;
88static unsigned deepest_delta;
89static git_SHA_CTX input_ctx;
90static uint32_t input_crc32;
91static int input_fd, output_fd, pack_fd;
92#ifndef NO_PTHREADS
94static struct thread_local *thread_data;
96static int nr_dispatched;
97static int threads_active;
98static pthread_mutex_t read_mutex;
100#define read_lock() lock_mutex(&read_mutex)
101#define read_unlock() unlock_mutex(&read_mutex)
102static pthread_mutex_t counter_mutex;
104#define counter_lock() lock_mutex(&counter_mutex)
105#define counter_unlock() unlock_mutex(&counter_mutex)
106static pthread_mutex_t work_mutex;
108#define work_lock() lock_mutex(&work_mutex)
109#define work_unlock() unlock_mutex(&work_mutex)
110static pthread_key_t key;
112static inline void lock_mutex(pthread_mutex_t *mutex)
114{
115 if (threads_active)
116 pthread_mutex_lock(mutex);
117}
118static inline void unlock_mutex(pthread_mutex_t *mutex)
120{
121 if (threads_active)
122 pthread_mutex_unlock(mutex);
123}
124/*
126 * Mutex and conditional variable can't be statically-initialized on Windows.
127 */
128static void init_thread(void)
129{
130 init_recursive_mutex(&read_mutex);
131 pthread_mutex_init(&counter_mutex, NULL);
132 pthread_mutex_init(&work_mutex, NULL);
133 pthread_key_create(&key, NULL);
134 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
135 threads_active = 1;
136}
137static void cleanup_thread(void)
139{
140 if (!threads_active)
141 return;
142 threads_active = 0;
143 pthread_mutex_destroy(&read_mutex);
144 pthread_mutex_destroy(&counter_mutex);
145 pthread_mutex_destroy(&work_mutex);
146 pthread_key_delete(key);
147 free(thread_data);
148}
149#else
151#define read_lock()
153#define read_unlock()
154#define counter_lock()
156#define counter_unlock()
157#define work_lock()
159#define work_unlock()
160#endif
162static int mark_link(struct object *obj, int type, void *data)
165{
166 if (!obj)
167 return -1;
168 if (type != OBJ_ANY && obj->type != type)
170 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
171 obj->flags |= FLAG_LINK;
173 return 0;
174}
175/* The content of each linked object must have been checked
177 or it must be already present in the object database */
178static void check_object(struct object *obj)
179{
180 if (!obj)
181 return;
182 if (!(obj->flags & FLAG_LINK))
184 return;
185 if (!(obj->flags & FLAG_CHECKED)) {
187 unsigned long size;
188 int type = sha1_object_info(obj->sha1, &size);
189 if (type != obj->type || type <= 0)
190 die(_("object of unexpected type"));
191 obj->flags |= FLAG_CHECKED;
192 return;
193 }
194}
195static void check_objects(void)
197{
198 unsigned i, max;
199 max = get_max_object_index();
201 for (i = 0; i < max; i++)
202 check_object(get_indexed_object(i));
203}
204/* Discard current buffer used content. */
207static void flush(void)
208{
209 if (input_offset) {
210 if (output_fd >= 0)
211 write_or_die(output_fd, input_buffer, input_offset);
212 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
213 memmove(input_buffer, input_buffer + input_offset, input_len);
214 input_offset = 0;
215 }
216}
217/*
219 * Make sure at least "min" bytes are available in the buffer, and
220 * return the pointer to the buffer.
221 */
222static void *fill(int min)
223{
224 if (min <= input_len)
225 return input_buffer + input_offset;
226 if (min > sizeof(input_buffer))
227 die(Q_("cannot fill %d byte",
228 "cannot fill %d bytes",
229 min),
230 min);
231 flush();
232 do {
233 ssize_t ret = xread(input_fd, input_buffer + input_len,
234 sizeof(input_buffer) - input_len);
235 if (ret <= 0) {
236 if (!ret)
237 die(_("early EOF"));
238 die_errno(_("read error on input"));
239 }
240 input_len += ret;
241 if (from_stdin)
242 display_throughput(progress, consumed_bytes + input_len);
243 } while (input_len < min);
244 return input_buffer;
245}
246static void use(int bytes)
248{
249 if (bytes > input_len)
250 die(_("used more bytes than were available"));
251 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
252 input_len -= bytes;
253 input_offset += bytes;
254 /* make sure off_t is sufficiently large not to wrap */
256 if (signed_add_overflows(consumed_bytes, bytes))
257 die(_("pack too large for current definition of off_t"));
258 consumed_bytes += bytes;
259}
260static const char *open_pack_file(const char *pack_name)
262{
263 if (from_stdin) {
264 input_fd = 0;
265 if (!pack_name) {
266 static char tmp_file[PATH_MAX];
267 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
268 "pack/tmp_pack_XXXXXX");
269 pack_name = xstrdup(tmp_file);
270 } else
271 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
272 if (output_fd < 0)
273 die_errno(_("unable to create '%s'"), pack_name);
274 pack_fd = output_fd;
275 } else {
276 input_fd = open(pack_name, O_RDONLY);
277 if (input_fd < 0)
278 die_errno(_("cannot open packfile '%s'"), pack_name);
279 output_fd = -1;
280 pack_fd = input_fd;
281 }
282 git_SHA1_Init(&input_ctx);
283 return pack_name;
284}
285static void parse_pack_header(void)
287{
288 struct pack_header *hdr = fill(sizeof(struct pack_header));
289 /* Header consistency check */
291 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
292 die(_("pack signature mismatch"));
293 if (!pack_version_ok(hdr->hdr_version))
294 die("pack version %"PRIu32" unsupported",
295 ntohl(hdr->hdr_version));
296 nr_objects = ntohl(hdr->hdr_entries);
298 use(sizeof(struct pack_header));
299}
300static NORETURN void bad_object(unsigned long offset, const char *format,
302 ...) __attribute__((format (printf, 2, 3)));
303static NORETURN void bad_object(unsigned long offset, const char *format, ...)
305{
306 va_list params;
307 char buf[1024];
308 va_start(params, format);
310 vsnprintf(buf, sizeof(buf), format, params);
311 va_end(params);
312 die(_("pack has bad object at offset %lu: %s"), offset, buf);
313}
314static inline struct thread_local *get_thread_data(void)
316{
317#ifndef NO_PTHREADS
318 if (threads_active)
319 return pthread_getspecific(key);
320 assert(!threads_active &&
321 "This should only be reached when all threads are gone");
322#endif
323 return ¬hread_data;
324}
325#ifndef NO_PTHREADS
327static void set_thread_data(struct thread_local *data)
328{
329 if (threads_active)
330 pthread_setspecific(key, data);
331}
332#endif
333static struct base_data *alloc_base_data(void)
335{
336 struct base_data *base = xmalloc(sizeof(struct base_data));
337 memset(base, 0, sizeof(*base));
338 base->ref_last = -1;
339 base->ofs_last = -1;
340 return base;
341}
342static void free_base_data(struct base_data *c)
344{
345 if (c->data) {
346 free(c->data);
347 c->data = NULL;
348 get_thread_data()->base_cache_used -= c->size;
349 }
350}
351static void prune_base_data(struct base_data *retain)
353{
354 struct base_data *b;
355 struct thread_local *data = get_thread_data();
356 for (b = data->base_cache;
357 data->base_cache_used > delta_base_cache_limit && b;
358 b = b->child) {
359 if (b->data && b != retain)
360 free_base_data(b);
361 }
362}
363static void link_base_data(struct base_data *base, struct base_data *c)
365{
366 if (base)
367 base->child = c;
368 else
369 get_thread_data()->base_cache = c;
370 c->base = base;
372 c->child = NULL;
373 if (c->data)
374 get_thread_data()->base_cache_used += c->size;
375 prune_base_data(c);
376}
377static void unlink_base_data(struct base_data *c)
379{
380 struct base_data *base = c->base;
381 if (base)
382 base->child = NULL;
383 else
384 get_thread_data()->base_cache = NULL;
385 free_base_data(c);
386}
387static int is_delta_type(enum object_type type)
389{
390 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
391}
392static void *unpack_entry_data(unsigned long offset, unsigned long size,
394 enum object_type type, unsigned char *sha1)
395{
396 static char fixed_buf[8192];
397 int status;
398 git_zstream stream;
399 void *buf;
400 git_SHA_CTX c;
401 char hdr[32];
402 int hdrlen;
403 if (!is_delta_type(type)) {
405 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
406 git_SHA1_Init(&c);
407 git_SHA1_Update(&c, hdr, hdrlen);
408 } else
409 sha1 = NULL;
410 if (type == OBJ_BLOB && size > big_file_threshold)
411 buf = fixed_buf;
412 else
413 buf = xmalloc(size);
414 memset(&stream, 0, sizeof(stream));
416 git_inflate_init(&stream);
417 stream.next_out = buf;
418 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
419 do {
421 unsigned char *last_out = stream.next_out;
422 stream.next_in = fill(1);
423 stream.avail_in = input_len;
424 status = git_inflate(&stream, 0);
425 use(input_len - stream.avail_in);
426 if (sha1)
427 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
428 if (buf == fixed_buf) {
429 stream.next_out = buf;
430 stream.avail_out = sizeof(fixed_buf);
431 }
432 } while (status == Z_OK);
433 if (stream.total_out != size || status != Z_STREAM_END)
434 bad_object(offset, _("inflate returned %d"), status);
435 git_inflate_end(&stream);
436 if (sha1)
437 git_SHA1_Final(sha1, &c);
438 return buf == fixed_buf ? NULL : buf;
439}
440static void *unpack_raw_entry(struct object_entry *obj,
442 union delta_base *delta_base,
443 unsigned char *sha1)
444{
445 unsigned char *p;
446 unsigned long size, c;
447 off_t base_offset;
448 unsigned shift;
449 void *data;
450 obj->idx.offset = consumed_bytes;
452 input_crc32 = crc32(0, NULL, 0);
453 p = fill(1);
455 c = *p;
456 use(1);
457 obj->type = (c >> 4) & 7;
458 size = (c & 15);
459 shift = 4;
460 while (c & 0x80) {
461 p = fill(1);
462 c = *p;
463 use(1);
464 size += (c & 0x7f) << shift;
465 shift += 7;
466 }
467 obj->size = size;
468 switch (obj->type) {
470 case OBJ_REF_DELTA:
471 hashcpy(delta_base->sha1, fill(20));
472 use(20);
473 break;
474 case OBJ_OFS_DELTA:
475 memset(delta_base, 0, sizeof(*delta_base));
476 p = fill(1);
477 c = *p;
478 use(1);
479 base_offset = c & 127;
480 while (c & 128) {
481 base_offset += 1;
482 if (!base_offset || MSB(base_offset, 7))
483 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
484 p = fill(1);
485 c = *p;
486 use(1);
487 base_offset = (base_offset << 7) + (c & 127);
488 }
489 delta_base->offset = obj->idx.offset - base_offset;
490 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
491 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
492 break;
493 case OBJ_COMMIT:
494 case OBJ_TREE:
495 case OBJ_BLOB:
496 case OBJ_TAG:
497 break;
498 default:
499 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
500 }
501 obj->hdr_size = consumed_bytes - obj->idx.offset;
502 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
504 obj->idx.crc32 = input_crc32;
505 return data;
506}
507static void *unpack_data(struct object_entry *obj,
509 int (*consume)(const unsigned char *, unsigned long, void *),
510 void *cb_data)
511{
512 off_t from = obj[0].idx.offset + obj[0].hdr_size;
513 unsigned long len = obj[1].idx.offset - from;
514 unsigned char *data, *inbuf;
515 git_zstream stream;
516 int status;
517 data = xmalloc(consume ? 64*1024 : obj->size);
519 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
520 memset(&stream, 0, sizeof(stream));
522 git_inflate_init(&stream);
523 stream.next_out = data;
524 stream.avail_out = consume ? 64*1024 : obj->size;
525 do {
527 unsigned char *last_out = stream.next_out;
528 ssize_t n = (len < 64*1024) ? len : 64*1024;
529 n = pread(pack_fd, inbuf, n, from);
530 if (n < 0)
531 die_errno(_("cannot pread pack file"));
532 if (!n)
533 die(Q_("premature end of pack file, %lu byte missing",
534 "premature end of pack file, %lu bytes missing",
535 len),
536 len);
537 from += n;
538 len -= n;
539 stream.next_in = inbuf;
540 stream.avail_in = n;
541 status = git_inflate(&stream, 0);
542 if (consume) {
543 if (consume(last_out, stream.next_out - last_out, cb_data)) {
544 free(inbuf);
545 free(data);
546 return NULL;
547 }
548 stream.next_out = data;
549 stream.avail_out = 64*1024;
550 }
551 } while (len && status == Z_OK && !stream.avail_in);
552 /* This has been inflated OK when first encountered, so... */
554 if (status != Z_STREAM_END || stream.total_out != obj->size)
555 die(_("serious inflate inconsistency"));
556 git_inflate_end(&stream);
558 free(inbuf);
559 if (consume) {
560 free(data);
561 data = NULL;
562 }
563 return data;
564}
565static void *get_data_from_pack(struct object_entry *obj)
567{
568 return unpack_data(obj, NULL, NULL);
569}
570static int compare_delta_bases(const union delta_base *base1,
572 const union delta_base *base2,
573 enum object_type type1,
574 enum object_type type2)
575{
576 int cmp = type1 - type2;
577 if (cmp)
578 return cmp;
579 return memcmp(base1, base2, UNION_BASE_SZ);
580}
581static int find_delta(const union delta_base *base, enum object_type type)
583{
584 int first = 0, last = nr_deltas;
585 while (first < last) {
587 int next = (first + last) / 2;
588 struct delta_entry *delta = &deltas[next];
589 int cmp;
590 cmp = compare_delta_bases(base, &delta->base,
592 type, objects[delta->obj_no].type);
593 if (!cmp)
594 return next;
595 if (cmp < 0) {
596 last = next;
597 continue;
598 }
599 first = next+1;
600 }
601 return -first-1;
602}
603static void find_delta_children(const union delta_base *base,
605 int *first_index, int *last_index,
606 enum object_type type)
607{
608 int first = find_delta(base, type);
609 int last = first;
610 int end = nr_deltas - 1;
611 if (first < 0) {
613 *first_index = 0;
614 *last_index = -1;
615 return;
616 }
617 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
618 --first;
619 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
620 ++last;
621 *first_index = first;
622 *last_index = last;
623}
624struct compare_data {
626 struct object_entry *entry;
627 struct git_istream *st;
628 unsigned char *buf;
629 unsigned long buf_size;
630};
631static int compare_objects(const unsigned char *buf, unsigned long size,
633 void *cb_data)
634{
635 struct compare_data *data = cb_data;
636 if (data->buf_size < size) {
638 free(data->buf);
639 data->buf = xmalloc(size);
640 data->buf_size = size;
641 }
642 while (size) {
644 ssize_t len = read_istream(data->st, data->buf, size);
645 if (len == 0)
646 die(_("SHA1 COLLISION FOUND WITH %s !"),
647 sha1_to_hex(data->entry->idx.sha1));
648 if (len < 0)
649 die(_("unable to read %s"),
650 sha1_to_hex(data->entry->idx.sha1));
651 if (memcmp(buf, data->buf, len))
652 die(_("SHA1 COLLISION FOUND WITH %s !"),
653 sha1_to_hex(data->entry->idx.sha1));
654 size -= len;
655 buf += len;
656 }
657 return 0;
658}
659static int check_collison(struct object_entry *entry)
661{
662 struct compare_data data;
663 enum object_type type;
664 unsigned long size;
665 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
667 return -1;
668 memset(&data, 0, sizeof(data));
670 data.entry = entry;
671 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
672 if (!data.st)
673 return -1;
674 if (size != entry->size || type != entry->type)
675 die(_("SHA1 COLLISION FOUND WITH %s !"),
676 sha1_to_hex(entry->idx.sha1));
677 unpack_data(entry, compare_objects, &data);
678 close_istream(data.st);
679 free(data.buf);
680 return 0;
681}
682static void sha1_object(const void *data, struct object_entry *obj_entry,
684 unsigned long size, enum object_type type,
685 const unsigned char *sha1)
686{
687 void *new_data = NULL;
688 int collision_test_needed;
689 assert(data || obj_entry);
691 read_lock();
693 collision_test_needed = has_sha1_file(sha1);
694 read_unlock();
695 if (collision_test_needed && !data) {
697 read_lock();
698 if (!check_collison(obj_entry))
699 collision_test_needed = 0;
700 read_unlock();
701 }
702 if (collision_test_needed) {
703 void *has_data;
704 enum object_type has_type;
705 unsigned long has_size;
706 read_lock();
707 has_type = sha1_object_info(sha1, &has_size);
708 if (has_type != type || has_size != size)
709 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
710 has_data = read_sha1_file(sha1, &has_type, &has_size);
711 read_unlock();
712 if (!data)
713 data = new_data = get_data_from_pack(obj_entry);
714 if (!has_data)
715 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
716 if (size != has_size || type != has_type ||
717 memcmp(data, has_data, size) != 0)
718 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
719 free(has_data);
720 }
721 if (strict) {
723 read_lock();
724 if (type == OBJ_BLOB) {
725 struct blob *blob = lookup_blob(sha1);
726 if (blob)
727 blob->object.flags |= FLAG_CHECKED;
728 else
729 die(_("invalid blob object %s"), sha1_to_hex(sha1));
730 } else {
731 struct object *obj;
732 int eaten;
733 void *buf = (void *) data;
734 if (!buf)
736 buf = new_data = get_data_from_pack(obj_entry);
737 /*
739 * we do not need to free the memory here, as the
740 * buf is deleted by the caller.
741 */
742 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
743 if (!obj)
744 die(_("invalid %s"), typename(type));
745 if (fsck_object(obj, 1, fsck_error_function))
746 die(_("Error in object"));
747 if (fsck_walk(obj, mark_link, NULL))
748 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
749 if (obj->type == OBJ_TREE) {
751 struct tree *item = (struct tree *) obj;
752 item->buffer = NULL;
753 }
754 if (obj->type == OBJ_COMMIT) {
755 struct commit *commit = (struct commit *) obj;
756 commit->buffer = NULL;
757 }
758 obj->flags |= FLAG_CHECKED;
759 }
760 read_unlock();
761 }
762 free(new_data);
764}
765/*
767 * This function is part of find_unresolved_deltas(). There are two
768 * walkers going in the opposite ways.
769 *
770 * The first one in find_unresolved_deltas() traverses down from
771 * parent node to children, deflating nodes along the way. However,
772 * memory for deflated nodes is limited by delta_base_cache_limit, so
773 * at some point parent node's deflated content may be freed.
774 *
775 * The second walker is this function, which goes from current node up
776 * to top parent if necessary to deflate the node. In normal
777 * situation, its parent node would be already deflated, so it just
778 * needs to apply delta.
779 *
780 * In the worst case scenario, parent node is no longer deflated because
781 * we're running out of delta_base_cache_limit; we need to re-deflate
782 * parents, possibly up to the top base.
783 *
784 * All deflated objects here are subject to be freed if we exceed
785 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
786 * just need to make sure the last node is not freed.
787 */
788static void *get_base_data(struct base_data *c)
789{
790 if (!c->data) {
791 struct object_entry *obj = c->obj;
792 struct base_data **delta = NULL;
793 int delta_nr = 0, delta_alloc = 0;
794 while (is_delta_type(c->obj->type) && !c->data) {
796 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
797 delta[delta_nr++] = c;
798 c = c->base;
799 }
800 if (!delta_nr) {
801 c->data = get_data_from_pack(obj);
802 c->size = obj->size;
803 get_thread_data()->base_cache_used += c->size;
804 prune_base_data(c);
805 }
806 for (; delta_nr > 0; delta_nr--) {
807 void *base, *raw;
808 c = delta[delta_nr - 1];
809 obj = c->obj;
810 base = get_base_data(c->base);
811 raw = get_data_from_pack(obj);
812 c->data = patch_delta(
813 base, c->base->size,
814 raw, obj->size,
815 &c->size);
816 free(raw);
817 if (!c->data)
818 bad_object(obj->idx.offset, _("failed to apply delta"));
819 get_thread_data()->base_cache_used += c->size;
820 prune_base_data(c);
821 }
822 free(delta);
823 }
824 return c->data;
825}
826static void resolve_delta(struct object_entry *delta_obj,
828 struct base_data *base, struct base_data *result)
829{
830 void *base_data, *delta_data;
831 delta_obj->real_type = base->obj->real_type;
833 delta_obj->delta_depth = base->obj->delta_depth + 1;
834 if (deepest_delta < delta_obj->delta_depth)
835 deepest_delta = delta_obj->delta_depth;
836 delta_obj->base_object_no = base->obj - objects;
837 delta_data = get_data_from_pack(delta_obj);
838 base_data = get_base_data(base);
839 result->obj = delta_obj;
840 result->data = patch_delta(base_data, base->size,
841 delta_data, delta_obj->size, &result->size);
842 free(delta_data);
843 if (!result->data)
844 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
845 hash_sha1_file(result->data, result->size,
846 typename(delta_obj->real_type), delta_obj->idx.sha1);
847 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
848 delta_obj->idx.sha1);
849 counter_lock();
850 nr_resolved_deltas++;
851 counter_unlock();
852}
853static struct base_data *find_unresolved_deltas_1(struct base_data *base,
855 struct base_data *prev_base)
856{
857 if (base->ref_last == -1 && base->ofs_last == -1) {
858 union delta_base base_spec;
859 hashcpy(base_spec.sha1, base->obj->idx.sha1);
861 find_delta_children(&base_spec,
862 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
863 memset(&base_spec, 0, sizeof(base_spec));
865 base_spec.offset = base->obj->idx.offset;
866 find_delta_children(&base_spec,
867 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
868 if (base->ref_last == -1 && base->ofs_last == -1) {
870 free(base->data);
871 return NULL;
872 }
873 link_base_data(prev_base, base);
875 }
876 if (base->ref_first <= base->ref_last) {
878 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
879 struct base_data *result = alloc_base_data();
880 assert(child->real_type == OBJ_REF_DELTA);
882 resolve_delta(child, base, result);
883 if (base->ref_first == base->ref_last && base->ofs_last == -1)
884 free_base_data(base);
885 base->ref_first++;
887 return result;
888 }
889 if (base->ofs_first <= base->ofs_last) {
891 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
892 struct base_data *result = alloc_base_data();
893 assert(child->real_type == OBJ_OFS_DELTA);
895 resolve_delta(child, base, result);
896 if (base->ofs_first == base->ofs_last)
897 free_base_data(base);
898 base->ofs_first++;
900 return result;
901 }
902 unlink_base_data(base);
904 return NULL;
905}
906static void find_unresolved_deltas(struct base_data *base)
908{
909 struct base_data *new_base, *prev_base = NULL;
910 for (;;) {
911 new_base = find_unresolved_deltas_1(base, prev_base);
912 if (new_base) {
914 prev_base = base;
915 base = new_base;
916 } else {
917 free(base);
918 base = prev_base;
919 if (!base)
920 return;
921 prev_base = base->base;
922 }
923 }
924}
925static int compare_delta_entry(const void *a, const void *b)
927{
928 const struct delta_entry *delta_a = a;
929 const struct delta_entry *delta_b = b;
930 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
932 return compare_delta_bases(&delta_a->base, &delta_b->base,
933 objects[delta_a->obj_no].type,
934 objects[delta_b->obj_no].type);
935}
936static void resolve_base(struct object_entry *obj)
938{
939 struct base_data *base_obj = alloc_base_data();
940 base_obj->obj = obj;
941 base_obj->data = NULL;
942 find_unresolved_deltas(base_obj);
943}
944#ifndef NO_PTHREADS
946static void *threaded_second_pass(void *data)
947{
948 set_thread_data(data);
949 for (;;) {
950 int i;
951 work_lock();
952 display_progress(progress, nr_resolved_deltas);
953 while (nr_dispatched < nr_objects &&
954 is_delta_type(objects[nr_dispatched].type))
955 nr_dispatched++;
956 if (nr_dispatched >= nr_objects) {
957 work_unlock();
958 break;
959 }
960 i = nr_dispatched++;
961 work_unlock();
962 resolve_base(&objects[i]);
964 }
965 return NULL;
966}
967#endif
968/*
970 * First pass:
971 * - find locations of all objects;
972 * - calculate SHA1 of all non-delta objects;
973 * - remember base (SHA1 or offset) for all deltas.
974 */
975static void parse_pack_objects(unsigned char *sha1)
976{
977 int i, nr_delays = 0;
978 struct delta_entry *delta = deltas;
979 struct stat st;
980 if (verbose)
982 progress = start_progress(
983 from_stdin ? _("Receiving objects") : _("Indexing objects"),
984 nr_objects);
985 for (i = 0; i < nr_objects; i++) {
986 struct object_entry *obj = &objects[i];
987 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
988 obj->real_type = obj->type;
989 if (is_delta_type(obj->type)) {
990 nr_deltas++;
991 delta->obj_no = i;
992 delta++;
993 } else if (!data) {
994 /* large blobs, check later */
995 obj->real_type = OBJ_BAD;
996 nr_delays++;
997 } else
998 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
999 free(data);
1000 display_progress(progress, i+1);
1001 }
1002 objects[i].idx.offset = consumed_bytes;
1003 stop_progress(&progress);
1004 /* Check pack integrity */
1006 flush();
1007 git_SHA1_Final(sha1, &input_ctx);
1008 if (hashcmp(fill(20), sha1))
1009 die(_("pack is corrupted (SHA1 mismatch)"));
1010 use(20);
1011 /* If input_fd is a file, we should have reached its end now. */
1013 if (fstat(input_fd, &st))
1014 die_errno(_("cannot fstat packfile"));
1015 if (S_ISREG(st.st_mode) &&
1016 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1017 die(_("pack has junk at the end"));
1018 for (i = 0; i < nr_objects; i++) {
1020 struct object_entry *obj = &objects[i];
1021 if (obj->real_type != OBJ_BAD)
1022 continue;
1023 obj->real_type = obj->type;
1024 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1025 nr_delays--;
1026 }
1027 if (nr_delays)
1028 die(_("confusion beyond insanity in parse_pack_objects()"));
1029}
1030/*
1032 * Second pass:
1033 * - for all non-delta objects, look if it is used as a base for
1034 * deltas;
1035 * - if used as a base, uncompress the object and apply all deltas,
1036 * recursively checking if the resulting object is used as a base
1037 * for some more deltas.
1038 */
1039static void resolve_deltas(void)
1040{
1041 int i;
1042 if (!nr_deltas)
1044 return;
1045 /* Sort deltas by base SHA1/offset for fast searching */
1047 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1048 compare_delta_entry);
1049 if (verbose)
1051 progress = start_progress(_("Resolving deltas"), nr_deltas);
1052#ifndef NO_PTHREADS
1054 nr_dispatched = 0;
1055 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1056 init_thread();
1057 for (i = 0; i < nr_threads; i++) {
1058 int ret = pthread_create(&thread_data[i].thread, NULL,
1059 threaded_second_pass, thread_data + i);
1060 if (ret)
1061 die("unable to create thread: %s", strerror(ret));
1062 }
1063 for (i = 0; i < nr_threads; i++)
1064 pthread_join(thread_data[i].thread, NULL);
1065 cleanup_thread();
1066 return;
1067 }
1068#endif
1069 for (i = 0; i < nr_objects; i++) {
1071 struct object_entry *obj = &objects[i];
1072 if (is_delta_type(obj->type))
1074 continue;
1075 resolve_base(obj);
1076 display_progress(progress, nr_resolved_deltas);
1077 }
1078}
1079/*
1081 * Third pass:
1082 * - append objects to convert thin pack to full pack if required
1083 * - write the final 20-byte SHA-1
1084 */
1085static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1086static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1087{
1088 if (nr_deltas == nr_resolved_deltas) {
1089 stop_progress(&progress);
1090 /* Flush remaining pack final 20-byte SHA1. */
1091 flush();
1092 return;
1093 }
1094 if (fix_thin_pack) {
1096 struct sha1file *f;
1097 unsigned char read_sha1[20], tail_sha1[20];
1098 char msg[48];
1099 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1100 int nr_objects_initial = nr_objects;
1101 if (nr_unresolved <= 0)
1102 die(_("confusion beyond insanity"));
1103 objects = xrealloc(objects,
1104 (nr_objects + nr_unresolved + 1)
1105 * sizeof(*objects));
1106 f = sha1fd(output_fd, curr_pack);
1107 fix_unresolved_deltas(f, nr_unresolved);
1108 sprintf(msg, "completed with %d local objects",
1109 nr_objects - nr_objects_initial);
1110 stop_progress_msg(&progress, msg);
1111 sha1close(f, tail_sha1, 0);
1112 hashcpy(read_sha1, pack_sha1);
1113 fixup_pack_header_footer(output_fd, pack_sha1,
1114 curr_pack, nr_objects,
1115 read_sha1, consumed_bytes-20);
1116 if (hashcmp(read_sha1, tail_sha1) != 0)
1117 die("Unexpected tail checksum for %s "
1118 "(disk corruption?)", curr_pack);
1119 }
1120 if (nr_deltas != nr_resolved_deltas)
1121 die(Q_("pack has %d unresolved delta",
1122 "pack has %d unresolved deltas",
1123 nr_deltas - nr_resolved_deltas),
1124 nr_deltas - nr_resolved_deltas);
1125}
1126static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1128{
1129 git_zstream stream;
1130 int status;
1131 unsigned char outbuf[4096];
1132 memset(&stream, 0, sizeof(stream));
1134 git_deflate_init(&stream, zlib_compression_level);
1135 stream.next_in = in;
1136 stream.avail_in = size;
1137 do {
1139 stream.next_out = outbuf;
1140 stream.avail_out = sizeof(outbuf);
1141 status = git_deflate(&stream, Z_FINISH);
1142 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1143 } while (status == Z_OK);
1144 if (status != Z_STREAM_END)
1146 die(_("unable to deflate appended object (%d)"), status);
1147 size = stream.total_out;
1148 git_deflate_end(&stream);
1149 return size;
1150}
1151static struct object_entry *append_obj_to_pack(struct sha1file *f,
1153 const unsigned char *sha1, void *buf,
1154 unsigned long size, enum object_type type)
1155{
1156 struct object_entry *obj = &objects[nr_objects++];
1157 unsigned char header[10];
1158 unsigned long s = size;
1159 int n = 0;
1160 unsigned char c = (type << 4) | (s & 15);
1161 s >>= 4;
1162 while (s) {
1163 header[n++] = c | 0x80;
1164 c = s & 0x7f;
1165 s >>= 7;
1166 }
1167 header[n++] = c;
1168 crc32_begin(f);
1169 sha1write(f, header, n);
1170 obj[0].size = size;
1171 obj[0].hdr_size = n;
1172 obj[0].type = type;
1173 obj[0].real_type = type;
1174 obj[1].idx.offset = obj[0].idx.offset + n;
1175 obj[1].idx.offset += write_compressed(f, buf, size);
1176 obj[0].idx.crc32 = crc32_end(f);
1177 sha1flush(f);
1178 hashcpy(obj->idx.sha1, sha1);
1179 return obj;
1180}
1181static int delta_pos_compare(const void *_a, const void *_b)
1183{
1184 struct delta_entry *a = *(struct delta_entry **)_a;
1185 struct delta_entry *b = *(struct delta_entry **)_b;
1186 return a->obj_no - b->obj_no;
1187}
1188static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1190{
1191 struct delta_entry **sorted_by_pos;
1192 int i, n = 0;
1193 /*
1195 * Since many unresolved deltas may well be themselves base objects
1196 * for more unresolved deltas, we really want to include the
1197 * smallest number of base objects that would cover as much delta
1198 * as possible by picking the
1199 * trunc deltas first, allowing for other deltas to resolve without
1200 * additional base objects. Since most base objects are to be found
1201 * before deltas depending on them, a good heuristic is to start
1202 * resolving deltas in the same order as their position in the pack.
1203 */
1204 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1205 for (i = 0; i < nr_deltas; i++) {
1206 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1207 continue;
1208 sorted_by_pos[n++] = &deltas[i];
1209 }
1210 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1211 for (i = 0; i < n; i++) {
1213 struct delta_entry *d = sorted_by_pos[i];
1214 enum object_type type;
1215 struct base_data *base_obj = alloc_base_data();
1216 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1218 continue;
1219 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1220 if (!base_obj->data)
1221 continue;
1222 if (check_sha1_signature(d->base.sha1, base_obj->data,
1224 base_obj->size, typename(type)))
1225 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1226 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1227 base_obj->data, base_obj->size, type);
1228 find_unresolved_deltas(base_obj);
1229 display_progress(progress, nr_resolved_deltas);
1230 }
1231 free(sorted_by_pos);
1232}
1233static void final(const char *final_pack_name, const char *curr_pack_name,
1235 const char *final_index_name, const char *curr_index_name,
1236 const char *keep_name, const char *keep_msg,
1237 unsigned char *sha1)
1238{
1239 const char *report = "pack";
1240 char name[PATH_MAX];
1241 int err;
1242 if (!from_stdin) {
1244 close(input_fd);
1245 } else {
1246 fsync_or_die(output_fd, curr_pack_name);
1247 err = close(output_fd);
1248 if (err)
1249 die_errno(_("error while closing pack file"));
1250 }
1251 if (keep_msg) {
1253 int keep_fd, keep_msg_len = strlen(keep_msg);
1254 if (!keep_name)
1256 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1257 else
1258 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1259 if (keep_fd < 0) {
1261 if (errno != EEXIST)
1262 die_errno(_("cannot write keep file '%s'"),
1263 keep_name);
1264 } else {
1265 if (keep_msg_len > 0) {
1266 write_or_die(keep_fd, keep_msg, keep_msg_len);
1267 write_or_die(keep_fd, "\n", 1);
1268 }
1269 if (close(keep_fd) != 0)
1270 die_errno(_("cannot close written keep file '%s'"),
1271 keep_name);
1272 report = "keep";
1273 }
1274 }
1275 if (final_pack_name != curr_pack_name) {
1277 if (!final_pack_name) {
1278 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1279 get_object_directory(), sha1_to_hex(sha1));
1280 final_pack_name = name;
1281 }
1282 if (move_temp_to_file(curr_pack_name, final_pack_name))
1283 die(_("cannot store pack file"));
1284 } else if (from_stdin)
1285 chmod(final_pack_name, 0444);
1286 if (final_index_name != curr_index_name) {
1288 if (!final_index_name) {
1289 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1290 get_object_directory(), sha1_to_hex(sha1));
1291 final_index_name = name;
1292 }
1293 if (move_temp_to_file(curr_index_name, final_index_name))
1294 die(_("cannot store index file"));
1295 } else
1296 chmod(final_index_name, 0444);
1297 if (!from_stdin) {
1299 printf("%s\n", sha1_to_hex(sha1));
1300 } else {
1301 char buf[48];
1302 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1303 report, sha1_to_hex(sha1));
1304 write_or_die(1, buf, len);
1305 /*
1307 * Let's just mimic git-unpack-objects here and write
1308 * the last part of the input buffer to stdout.
1309 */
1310 while (input_len) {
1311 err = xwrite(1, input_buffer + input_offset, input_len);
1312 if (err <= 0)
1313 break;
1314 input_len -= err;
1315 input_offset += err;
1316 }
1317 }
1318}
1319static int git_index_pack_config(const char *k, const char *v, void *cb)
1321{
1322 struct pack_idx_option *opts = cb;
1323 if (!strcmp(k, "pack.indexversion")) {
1325 opts->version = git_config_int(k, v);
1326 if (opts->version > 2)
1327 die("bad pack.indexversion=%"PRIu32, opts->version);
1328 return 0;
1329 }
1330 if (!strcmp(k, "pack.threads")) {
1331 nr_threads = git_config_int(k, v);
1332 if (nr_threads < 0)
1333 die("invalid number of threads specified (%d)",
1334 nr_threads);
1335#ifdef NO_PTHREADS
1336 if (nr_threads != 1)
1337 warning("no threads support, ignoring %s", k);
1338 nr_threads = 1;
1339#endif
1340 return 0;
1341 }
1342 return git_default_config(k, v, cb);
1343}
1344static int cmp_uint32(const void *a_, const void *b_)
1346{
1347 uint32_t a = *((uint32_t *)a_);
1348 uint32_t b = *((uint32_t *)b_);
1349 return (a < b) ? -1 : (a != b);
1351}
1352static void read_v2_anomalous_offsets(struct packed_git *p,
1354 struct pack_idx_option *opts)
1355{
1356 const uint32_t *idx1, *idx2;
1357 uint32_t i;
1358 /* The address of the 4-byte offset table */
1360 idx1 = (((const uint32_t *)p->index_data)
1361 + 2 /* 8-byte header */
1362 + 256 /* fan out */
1363 + 5 * p->num_objects /* 20-byte SHA-1 table */
1364 + p->num_objects /* CRC32 table */
1365 );
1366 /* The address of the 8-byte offset table */
1368 idx2 = idx1 + p->num_objects;
1369 for (i = 0; i < p->num_objects; i++) {
1371 uint32_t off = ntohl(idx1[i]);
1372 if (!(off & 0x80000000))
1373 continue;
1374 off = off & 0x7fffffff;
1375 if (idx2[off * 2])
1376 continue;
1377 /*
1378 * The real offset is ntohl(idx2[off * 2]) in high 4
1379 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1380 * octets. But idx2[off * 2] is Zero!!!
1381 */
1382 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1383 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1384 }
1385 if (1 < opts->anomaly_nr)
1387 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1388}
1389static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1391{
1392 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1393 if (!p)
1395 die(_("Cannot open existing pack file '%s'"), pack_name);
1396 if (open_pack_index(p))
1397 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1398 /* Read the attributes from the existing idx file */
1400 opts->version = p->index_version;
1401 if (opts->version == 2)
1403 read_v2_anomalous_offsets(p, opts);
1404 /*
1406 * Get rid of the idx file as we do not need it anymore.
1407 * NEEDSWORK: extract this bit from free_pack_by_name() in
1408 * sha1_file.c, perhaps? It shouldn't matter very much as we
1409 * know we haven't installed this pack (hence we never have
1410 * read anything from it).
1411 */
1412 close_pack_index(p);
1413 free(p);
1414}
1415static void show_pack_info(int stat_only)
1417{
1418 int i, baseobjects = nr_objects - nr_deltas;
1419 unsigned long *chain_histogram = NULL;
1420 if (deepest_delta)
1422 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1423 for (i = 0; i < nr_objects; i++) {
1425 struct object_entry *obj = &objects[i];
1426 if (is_delta_type(obj->type))
1428 chain_histogram[obj->delta_depth - 1]++;
1429 if (stat_only)
1430 continue;
1431 printf("%s %-6s %lu %lu %"PRIuMAX,
1432 sha1_to_hex(obj->idx.sha1),
1433 typename(obj->real_type), obj->size,
1434 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1435 (uintmax_t)obj->idx.offset);
1436 if (is_delta_type(obj->type)) {
1437 struct object_entry *bobj = &objects[obj->base_object_no];
1438 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1439 }
1440 putchar('\n');
1441 }
1442 if (baseobjects)
1444 printf_ln(Q_("non delta: %d object",
1445 "non delta: %d objects",
1446 baseobjects),
1447 baseobjects);
1448 for (i = 0; i < deepest_delta; i++) {
1449 if (!chain_histogram[i])
1450 continue;
1451 printf_ln(Q_("chain length = %d: %lu object",
1452 "chain length = %d: %lu objects",
1453 chain_histogram[i]),
1454 i + 1,
1455 chain_histogram[i]);
1456 }
1457}
1458int cmd_index_pack(int argc, const char **argv, const char *prefix)
1460{
1461 int i, fix_thin_pack = 0, verify = 0, stat_only = 0, stat = 0;
1462 const char *curr_pack, *curr_index;
1463 const char *index_name = NULL, *pack_name = NULL;
1464 const char *keep_name = NULL, *keep_msg = NULL;
1465 char *index_name_buf = NULL, *keep_name_buf = NULL;
1466 struct pack_idx_entry **idx_objects;
1467 struct pack_idx_option opts;
1468 unsigned char pack_sha1[20];
1469 if (argc == 2 && !strcmp(argv[1], "-h"))
1471 usage(index_pack_usage);
1472 read_replace_refs = 0;
1474 reset_pack_idx_option(&opts);
1476 git_config(git_index_pack_config, &opts);
1477 if (prefix && chdir(prefix))
1478 die(_("Cannot come back to cwd"));
1479 for (i = 1; i < argc; i++) {
1481 const char *arg = argv[i];
1482 if (*arg == '-') {
1484 if (!strcmp(arg, "--stdin")) {
1485 from_stdin = 1;
1486 } else if (!strcmp(arg, "--fix-thin")) {
1487 fix_thin_pack = 1;
1488 } else if (!strcmp(arg, "--strict")) {
1489 strict = 1;
1490 } else if (!strcmp(arg, "--verify")) {
1491 verify = 1;
1492 } else if (!strcmp(arg, "--verify-stat")) {
1493 verify = 1;
1494 stat = 1;
1495 } else if (!strcmp(arg, "--verify-stat-only")) {
1496 verify = 1;
1497 stat = 1;
1498 stat_only = 1;
1499 } else if (!strcmp(arg, "--keep")) {
1500 keep_msg = "";
1501 } else if (!prefixcmp(arg, "--keep=")) {
1502 keep_msg = arg + 7;
1503 } else if (!prefixcmp(arg, "--threads=")) {
1504 char *end;
1505 nr_threads = strtoul(arg+10, &end, 0);
1506 if (!arg[10] || *end || nr_threads < 0)
1507 usage(index_pack_usage);
1508#ifdef NO_PTHREADS
1509 if (nr_threads != 1)
1510 warning("no threads support, "
1511 "ignoring %s", arg);
1512 nr_threads = 1;
1513#endif
1514 } else if (!prefixcmp(arg, "--pack_header=")) {
1515 struct pack_header *hdr;
1516 char *c;
1517 hdr = (struct pack_header *)input_buffer;
1519 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1520 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1521 if (*c != ',')
1522 die(_("bad %s"), arg);
1523 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1524 if (*c)
1525 die(_("bad %s"), arg);
1526 input_len = sizeof(*hdr);
1527 } else if (!strcmp(arg, "-v")) {
1528 verbose = 1;
1529 } else if (!strcmp(arg, "-o")) {
1530 if (index_name || (i+1) >= argc)
1531 usage(index_pack_usage);
1532 index_name = argv[++i];
1533 } else if (!prefixcmp(arg, "--index-version=")) {
1534 char *c;
1535 opts.version = strtoul(arg + 16, &c, 10);
1536 if (opts.version > 2)
1537 die(_("bad %s"), arg);
1538 if (*c == ',')
1539 opts.off32_limit = strtoul(c+1, &c, 0);
1540 if (*c || opts.off32_limit & 0x80000000)
1541 die(_("bad %s"), arg);
1542 } else
1543 usage(index_pack_usage);
1544 continue;
1545 }
1546 if (pack_name)
1548 usage(index_pack_usage);
1549 pack_name = arg;
1550 }
1551 if (!pack_name && !from_stdin)
1553 usage(index_pack_usage);
1554 if (fix_thin_pack && !from_stdin)
1555 die(_("--fix-thin cannot be used without --stdin"));
1556 if (!index_name && pack_name) {
1557 int len = strlen(pack_name);
1558 if (!has_extension(pack_name, ".pack"))
1559 die(_("packfile name '%s' does not end with '.pack'"),
1560 pack_name);
1561 index_name_buf = xmalloc(len);
1562 memcpy(index_name_buf, pack_name, len - 5);
1563 strcpy(index_name_buf + len - 5, ".idx");
1564 index_name = index_name_buf;
1565 }
1566 if (keep_msg && !keep_name && pack_name) {
1567 int len = strlen(pack_name);
1568 if (!has_extension(pack_name, ".pack"))
1569 die(_("packfile name '%s' does not end with '.pack'"),
1570 pack_name);
1571 keep_name_buf = xmalloc(len);
1572 memcpy(keep_name_buf, pack_name, len - 5);
1573 strcpy(keep_name_buf + len - 5, ".keep");
1574 keep_name = keep_name_buf;
1575 }
1576 if (verify) {
1577 if (!index_name)
1578 die(_("--verify with no packfile name given"));
1579 read_idx_option(&opts, index_name);
1580 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1581 }
1582 if (strict)
1583 opts.flags |= WRITE_IDX_STRICT;
1584#ifndef NO_PTHREADS
1586 if (!nr_threads) {
1587 nr_threads = online_cpus();
1588 /* An experiment showed that more threads does not mean faster */
1589 if (nr_threads > 3)
1590 nr_threads = 3;
1591 }
1592#endif
1593 curr_pack = open_pack_file(pack_name);
1595 parse_pack_header();
1596 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1597 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1598 parse_pack_objects(pack_sha1);
1599 resolve_deltas();
1600 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1601 free(deltas);
1602 if (strict)
1603 check_objects();
1604 if (stat)
1606 show_pack_info(stat_only);
1607 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1609 for (i = 0; i < nr_objects; i++)
1610 idx_objects[i] = &objects[i].idx;
1611 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1612 free(idx_objects);
1613 if (!verify)
1615 final(pack_name, curr_pack,
1616 index_name, curr_index,
1617 keep_name, keep_msg,
1618 pack_sha1);
1619 else
1620 close(input_fd);
1621 free(objects);
1622 free(index_name_buf);
1623 free(keep_name_buf);
1624 if (pack_name == NULL)
1625 free((void *) curr_pack);
1626 if (index_name == NULL)
1627 free((void *) curr_index);
1628 return 0;
1630}