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_THREAD_SAFE_PREAD)
44/* pread() emulation 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 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 if (!consume)
541 status = git_inflate(&stream, 0);
542 else {
543 do {
544 status = git_inflate(&stream, 0);
545 if (consume(data, stream.next_out - data, cb_data)) {
546 free(inbuf);
547 free(data);
548 return NULL;
549 }
550 stream.next_out = data;
551 stream.avail_out = 64*1024;
552 } while (status == Z_OK && stream.avail_in);
553 }
554 } while (len && status == Z_OK && !stream.avail_in);
555 /* This has been inflated OK when first encountered, so... */
557 if (status != Z_STREAM_END || stream.total_out != obj->size)
558 die(_("serious inflate inconsistency"));
559 git_inflate_end(&stream);
561 free(inbuf);
562 if (consume) {
563 free(data);
564 data = NULL;
565 }
566 return data;
567}
568static void *get_data_from_pack(struct object_entry *obj)
570{
571 return unpack_data(obj, NULL, NULL);
572}
573static int compare_delta_bases(const union delta_base *base1,
575 const union delta_base *base2,
576 enum object_type type1,
577 enum object_type type2)
578{
579 int cmp = type1 - type2;
580 if (cmp)
581 return cmp;
582 return memcmp(base1, base2, UNION_BASE_SZ);
583}
584static int find_delta(const union delta_base *base, enum object_type type)
586{
587 int first = 0, last = nr_deltas;
588 while (first < last) {
590 int next = (first + last) / 2;
591 struct delta_entry *delta = &deltas[next];
592 int cmp;
593 cmp = compare_delta_bases(base, &delta->base,
595 type, objects[delta->obj_no].type);
596 if (!cmp)
597 return next;
598 if (cmp < 0) {
599 last = next;
600 continue;
601 }
602 first = next+1;
603 }
604 return -first-1;
605}
606static void find_delta_children(const union delta_base *base,
608 int *first_index, int *last_index,
609 enum object_type type)
610{
611 int first = find_delta(base, type);
612 int last = first;
613 int end = nr_deltas - 1;
614 if (first < 0) {
616 *first_index = 0;
617 *last_index = -1;
618 return;
619 }
620 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
621 --first;
622 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
623 ++last;
624 *first_index = first;
625 *last_index = last;
626}
627struct compare_data {
629 struct object_entry *entry;
630 struct git_istream *st;
631 unsigned char *buf;
632 unsigned long buf_size;
633};
634static int compare_objects(const unsigned char *buf, unsigned long size,
636 void *cb_data)
637{
638 struct compare_data *data = cb_data;
639 if (data->buf_size < size) {
641 free(data->buf);
642 data->buf = xmalloc(size);
643 data->buf_size = size;
644 }
645 while (size) {
647 ssize_t len = read_istream(data->st, data->buf, size);
648 if (len == 0)
649 die(_("SHA1 COLLISION FOUND WITH %s !"),
650 sha1_to_hex(data->entry->idx.sha1));
651 if (len < 0)
652 die(_("unable to read %s"),
653 sha1_to_hex(data->entry->idx.sha1));
654 if (memcmp(buf, data->buf, len))
655 die(_("SHA1 COLLISION FOUND WITH %s !"),
656 sha1_to_hex(data->entry->idx.sha1));
657 size -= len;
658 buf += len;
659 }
660 return 0;
661}
662static int check_collison(struct object_entry *entry)
664{
665 struct compare_data data;
666 enum object_type type;
667 unsigned long size;
668 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
670 return -1;
671 memset(&data, 0, sizeof(data));
673 data.entry = entry;
674 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
675 if (!data.st)
676 return -1;
677 if (size != entry->size || type != entry->type)
678 die(_("SHA1 COLLISION FOUND WITH %s !"),
679 sha1_to_hex(entry->idx.sha1));
680 unpack_data(entry, compare_objects, &data);
681 close_istream(data.st);
682 free(data.buf);
683 return 0;
684}
685static void sha1_object(const void *data, struct object_entry *obj_entry,
687 unsigned long size, enum object_type type,
688 const unsigned char *sha1)
689{
690 void *new_data = NULL;
691 int collision_test_needed;
692 assert(data || obj_entry);
694 read_lock();
696 collision_test_needed = has_sha1_file(sha1);
697 read_unlock();
698 if (collision_test_needed && !data) {
700 read_lock();
701 if (!check_collison(obj_entry))
702 collision_test_needed = 0;
703 read_unlock();
704 }
705 if (collision_test_needed) {
706 void *has_data;
707 enum object_type has_type;
708 unsigned long has_size;
709 read_lock();
710 has_type = sha1_object_info(sha1, &has_size);
711 if (has_type != type || has_size != size)
712 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
713 has_data = read_sha1_file(sha1, &has_type, &has_size);
714 read_unlock();
715 if (!data)
716 data = new_data = get_data_from_pack(obj_entry);
717 if (!has_data)
718 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
719 if (size != has_size || type != has_type ||
720 memcmp(data, has_data, size) != 0)
721 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
722 free(has_data);
723 }
724 if (strict) {
726 read_lock();
727 if (type == OBJ_BLOB) {
728 struct blob *blob = lookup_blob(sha1);
729 if (blob)
730 blob->object.flags |= FLAG_CHECKED;
731 else
732 die(_("invalid blob object %s"), sha1_to_hex(sha1));
733 } else {
734 struct object *obj;
735 int eaten;
736 void *buf = (void *) data;
737 if (!buf)
739 buf = new_data = get_data_from_pack(obj_entry);
740 /*
742 * we do not need to free the memory here, as the
743 * buf is deleted by the caller.
744 */
745 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
746 if (!obj)
747 die(_("invalid %s"), typename(type));
748 if (fsck_object(obj, 1, fsck_error_function))
749 die(_("Error in object"));
750 if (fsck_walk(obj, mark_link, NULL))
751 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
752 if (obj->type == OBJ_TREE) {
754 struct tree *item = (struct tree *) obj;
755 item->buffer = NULL;
756 }
757 if (obj->type == OBJ_COMMIT) {
758 struct commit *commit = (struct commit *) obj;
759 commit->buffer = NULL;
760 }
761 obj->flags |= FLAG_CHECKED;
762 }
763 read_unlock();
764 }
765 free(new_data);
767}
768/*
770 * This function is part of find_unresolved_deltas(). There are two
771 * walkers going in the opposite ways.
772 *
773 * The first one in find_unresolved_deltas() traverses down from
774 * parent node to children, deflating nodes along the way. However,
775 * memory for deflated nodes is limited by delta_base_cache_limit, so
776 * at some point parent node's deflated content may be freed.
777 *
778 * The second walker is this function, which goes from current node up
779 * to top parent if necessary to deflate the node. In normal
780 * situation, its parent node would be already deflated, so it just
781 * needs to apply delta.
782 *
783 * In the worst case scenario, parent node is no longer deflated because
784 * we're running out of delta_base_cache_limit; we need to re-deflate
785 * parents, possibly up to the top base.
786 *
787 * All deflated objects here are subject to be freed if we exceed
788 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
789 * just need to make sure the last node is not freed.
790 */
791static void *get_base_data(struct base_data *c)
792{
793 if (!c->data) {
794 struct object_entry *obj = c->obj;
795 struct base_data **delta = NULL;
796 int delta_nr = 0, delta_alloc = 0;
797 while (is_delta_type(c->obj->type) && !c->data) {
799 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
800 delta[delta_nr++] = c;
801 c = c->base;
802 }
803 if (!delta_nr) {
804 c->data = get_data_from_pack(obj);
805 c->size = obj->size;
806 get_thread_data()->base_cache_used += c->size;
807 prune_base_data(c);
808 }
809 for (; delta_nr > 0; delta_nr--) {
810 void *base, *raw;
811 c = delta[delta_nr - 1];
812 obj = c->obj;
813 base = get_base_data(c->base);
814 raw = get_data_from_pack(obj);
815 c->data = patch_delta(
816 base, c->base->size,
817 raw, obj->size,
818 &c->size);
819 free(raw);
820 if (!c->data)
821 bad_object(obj->idx.offset, _("failed to apply delta"));
822 get_thread_data()->base_cache_used += c->size;
823 prune_base_data(c);
824 }
825 free(delta);
826 }
827 return c->data;
828}
829static void resolve_delta(struct object_entry *delta_obj,
831 struct base_data *base, struct base_data *result)
832{
833 void *base_data, *delta_data;
834 delta_obj->real_type = base->obj->real_type;
836 delta_obj->delta_depth = base->obj->delta_depth + 1;
837 if (deepest_delta < delta_obj->delta_depth)
838 deepest_delta = delta_obj->delta_depth;
839 delta_obj->base_object_no = base->obj - objects;
840 delta_data = get_data_from_pack(delta_obj);
841 base_data = get_base_data(base);
842 result->obj = delta_obj;
843 result->data = patch_delta(base_data, base->size,
844 delta_data, delta_obj->size, &result->size);
845 free(delta_data);
846 if (!result->data)
847 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
848 hash_sha1_file(result->data, result->size,
849 typename(delta_obj->real_type), delta_obj->idx.sha1);
850 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
851 delta_obj->idx.sha1);
852 counter_lock();
853 nr_resolved_deltas++;
854 counter_unlock();
855}
856static struct base_data *find_unresolved_deltas_1(struct base_data *base,
858 struct base_data *prev_base)
859{
860 if (base->ref_last == -1 && base->ofs_last == -1) {
861 union delta_base base_spec;
862 hashcpy(base_spec.sha1, base->obj->idx.sha1);
864 find_delta_children(&base_spec,
865 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
866 memset(&base_spec, 0, sizeof(base_spec));
868 base_spec.offset = base->obj->idx.offset;
869 find_delta_children(&base_spec,
870 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
871 if (base->ref_last == -1 && base->ofs_last == -1) {
873 free(base->data);
874 return NULL;
875 }
876 link_base_data(prev_base, base);
878 }
879 if (base->ref_first <= base->ref_last) {
881 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
882 struct base_data *result = alloc_base_data();
883 assert(child->real_type == OBJ_REF_DELTA);
885 resolve_delta(child, base, result);
886 if (base->ref_first == base->ref_last && base->ofs_last == -1)
887 free_base_data(base);
888 base->ref_first++;
890 return result;
891 }
892 if (base->ofs_first <= base->ofs_last) {
894 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
895 struct base_data *result = alloc_base_data();
896 assert(child->real_type == OBJ_OFS_DELTA);
898 resolve_delta(child, base, result);
899 if (base->ofs_first == base->ofs_last)
900 free_base_data(base);
901 base->ofs_first++;
903 return result;
904 }
905 unlink_base_data(base);
907 return NULL;
908}
909static void find_unresolved_deltas(struct base_data *base)
911{
912 struct base_data *new_base, *prev_base = NULL;
913 for (;;) {
914 new_base = find_unresolved_deltas_1(base, prev_base);
915 if (new_base) {
917 prev_base = base;
918 base = new_base;
919 } else {
920 free(base);
921 base = prev_base;
922 if (!base)
923 return;
924 prev_base = base->base;
925 }
926 }
927}
928static int compare_delta_entry(const void *a, const void *b)
930{
931 const struct delta_entry *delta_a = a;
932 const struct delta_entry *delta_b = b;
933 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
935 return compare_delta_bases(&delta_a->base, &delta_b->base,
936 objects[delta_a->obj_no].type,
937 objects[delta_b->obj_no].type);
938}
939static void resolve_base(struct object_entry *obj)
941{
942 struct base_data *base_obj = alloc_base_data();
943 base_obj->obj = obj;
944 base_obj->data = NULL;
945 find_unresolved_deltas(base_obj);
946}
947#ifndef NO_PTHREADS
949static void *threaded_second_pass(void *data)
950{
951 set_thread_data(data);
952 for (;;) {
953 int i;
954 work_lock();
955 display_progress(progress, nr_resolved_deltas);
956 while (nr_dispatched < nr_objects &&
957 is_delta_type(objects[nr_dispatched].type))
958 nr_dispatched++;
959 if (nr_dispatched >= nr_objects) {
960 work_unlock();
961 break;
962 }
963 i = nr_dispatched++;
964 work_unlock();
965 resolve_base(&objects[i]);
967 }
968 return NULL;
969}
970#endif
971/*
973 * First pass:
974 * - find locations of all objects;
975 * - calculate SHA1 of all non-delta objects;
976 * - remember base (SHA1 or offset) for all deltas.
977 */
978static void parse_pack_objects(unsigned char *sha1)
979{
980 int i, nr_delays = 0;
981 struct delta_entry *delta = deltas;
982 struct stat st;
983 if (verbose)
985 progress = start_progress(
986 from_stdin ? _("Receiving objects") : _("Indexing objects"),
987 nr_objects);
988 for (i = 0; i < nr_objects; i++) {
989 struct object_entry *obj = &objects[i];
990 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
991 obj->real_type = obj->type;
992 if (is_delta_type(obj->type)) {
993 nr_deltas++;
994 delta->obj_no = i;
995 delta++;
996 } else if (!data) {
997 /* large blobs, check later */
998 obj->real_type = OBJ_BAD;
999 nr_delays++;
1000 } else
1001 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1002 free(data);
1003 display_progress(progress, i+1);
1004 }
1005 objects[i].idx.offset = consumed_bytes;
1006 stop_progress(&progress);
1007 /* Check pack integrity */
1009 flush();
1010 git_SHA1_Final(sha1, &input_ctx);
1011 if (hashcmp(fill(20), sha1))
1012 die(_("pack is corrupted (SHA1 mismatch)"));
1013 use(20);
1014 /* If input_fd is a file, we should have reached its end now. */
1016 if (fstat(input_fd, &st))
1017 die_errno(_("cannot fstat packfile"));
1018 if (S_ISREG(st.st_mode) &&
1019 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1020 die(_("pack has junk at the end"));
1021 for (i = 0; i < nr_objects; i++) {
1023 struct object_entry *obj = &objects[i];
1024 if (obj->real_type != OBJ_BAD)
1025 continue;
1026 obj->real_type = obj->type;
1027 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1028 nr_delays--;
1029 }
1030 if (nr_delays)
1031 die(_("confusion beyond insanity in parse_pack_objects()"));
1032}
1033/*
1035 * Second pass:
1036 * - for all non-delta objects, look if it is used as a base for
1037 * deltas;
1038 * - if used as a base, uncompress the object and apply all deltas,
1039 * recursively checking if the resulting object is used as a base
1040 * for some more deltas.
1041 */
1042static void resolve_deltas(void)
1043{
1044 int i;
1045 if (!nr_deltas)
1047 return;
1048 /* Sort deltas by base SHA1/offset for fast searching */
1050 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1051 compare_delta_entry);
1052 if (verbose)
1054 progress = start_progress(_("Resolving deltas"), nr_deltas);
1055#ifndef NO_PTHREADS
1057 nr_dispatched = 0;
1058 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1059 init_thread();
1060 for (i = 0; i < nr_threads; i++) {
1061 int ret = pthread_create(&thread_data[i].thread, NULL,
1062 threaded_second_pass, thread_data + i);
1063 if (ret)
1064 die(_("unable to create thread: %s"),
1065 strerror(ret));
1066 }
1067 for (i = 0; i < nr_threads; i++)
1068 pthread_join(thread_data[i].thread, NULL);
1069 cleanup_thread();
1070 return;
1071 }
1072#endif
1073 for (i = 0; i < nr_objects; i++) {
1075 struct object_entry *obj = &objects[i];
1076 if (is_delta_type(obj->type))
1078 continue;
1079 resolve_base(obj);
1080 display_progress(progress, nr_resolved_deltas);
1081 }
1082}
1083/*
1085 * Third pass:
1086 * - append objects to convert thin pack to full pack if required
1087 * - write the final 20-byte SHA-1
1088 */
1089static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1090static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1091{
1092 if (nr_deltas == nr_resolved_deltas) {
1093 stop_progress(&progress);
1094 /* Flush remaining pack final 20-byte SHA1. */
1095 flush();
1096 return;
1097 }
1098 if (fix_thin_pack) {
1100 struct sha1file *f;
1101 unsigned char read_sha1[20], tail_sha1[20];
1102 struct strbuf msg = STRBUF_INIT;
1103 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1104 int nr_objects_initial = nr_objects;
1105 if (nr_unresolved <= 0)
1106 die(_("confusion beyond insanity"));
1107 objects = xrealloc(objects,
1108 (nr_objects + nr_unresolved + 1)
1109 * sizeof(*objects));
1110 f = sha1fd(output_fd, curr_pack);
1111 fix_unresolved_deltas(f, nr_unresolved);
1112 strbuf_addf(&msg, _("completed with %d local objects"),
1113 nr_objects - nr_objects_initial);
1114 stop_progress_msg(&progress, msg.buf);
1115 strbuf_release(&msg);
1116 sha1close(f, tail_sha1, 0);
1117 hashcpy(read_sha1, pack_sha1);
1118 fixup_pack_header_footer(output_fd, pack_sha1,
1119 curr_pack, nr_objects,
1120 read_sha1, consumed_bytes-20);
1121 if (hashcmp(read_sha1, tail_sha1) != 0)
1122 die(_("Unexpected tail checksum for %s "
1123 "(disk corruption?)"), curr_pack);
1124 }
1125 if (nr_deltas != nr_resolved_deltas)
1126 die(Q_("pack has %d unresolved delta",
1127 "pack has %d unresolved deltas",
1128 nr_deltas - nr_resolved_deltas),
1129 nr_deltas - nr_resolved_deltas);
1130}
1131static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1133{
1134 git_zstream stream;
1135 int status;
1136 unsigned char outbuf[4096];
1137 memset(&stream, 0, sizeof(stream));
1139 git_deflate_init(&stream, zlib_compression_level);
1140 stream.next_in = in;
1141 stream.avail_in = size;
1142 do {
1144 stream.next_out = outbuf;
1145 stream.avail_out = sizeof(outbuf);
1146 status = git_deflate(&stream, Z_FINISH);
1147 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1148 } while (status == Z_OK);
1149 if (status != Z_STREAM_END)
1151 die(_("unable to deflate appended object (%d)"), status);
1152 size = stream.total_out;
1153 git_deflate_end(&stream);
1154 return size;
1155}
1156static struct object_entry *append_obj_to_pack(struct sha1file *f,
1158 const unsigned char *sha1, void *buf,
1159 unsigned long size, enum object_type type)
1160{
1161 struct object_entry *obj = &objects[nr_objects++];
1162 unsigned char header[10];
1163 unsigned long s = size;
1164 int n = 0;
1165 unsigned char c = (type << 4) | (s & 15);
1166 s >>= 4;
1167 while (s) {
1168 header[n++] = c | 0x80;
1169 c = s & 0x7f;
1170 s >>= 7;
1171 }
1172 header[n++] = c;
1173 crc32_begin(f);
1174 sha1write(f, header, n);
1175 obj[0].size = size;
1176 obj[0].hdr_size = n;
1177 obj[0].type = type;
1178 obj[0].real_type = type;
1179 obj[1].idx.offset = obj[0].idx.offset + n;
1180 obj[1].idx.offset += write_compressed(f, buf, size);
1181 obj[0].idx.crc32 = crc32_end(f);
1182 sha1flush(f);
1183 hashcpy(obj->idx.sha1, sha1);
1184 return obj;
1185}
1186static int delta_pos_compare(const void *_a, const void *_b)
1188{
1189 struct delta_entry *a = *(struct delta_entry **)_a;
1190 struct delta_entry *b = *(struct delta_entry **)_b;
1191 return a->obj_no - b->obj_no;
1192}
1193static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1195{
1196 struct delta_entry **sorted_by_pos;
1197 int i, n = 0;
1198 /*
1200 * Since many unresolved deltas may well be themselves base objects
1201 * for more unresolved deltas, we really want to include the
1202 * smallest number of base objects that would cover as much delta
1203 * as possible by picking the
1204 * trunc deltas first, allowing for other deltas to resolve without
1205 * additional base objects. Since most base objects are to be found
1206 * before deltas depending on them, a good heuristic is to start
1207 * resolving deltas in the same order as their position in the pack.
1208 */
1209 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1210 for (i = 0; i < nr_deltas; i++) {
1211 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1212 continue;
1213 sorted_by_pos[n++] = &deltas[i];
1214 }
1215 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1216 for (i = 0; i < n; i++) {
1218 struct delta_entry *d = sorted_by_pos[i];
1219 enum object_type type;
1220 struct base_data *base_obj = alloc_base_data();
1221 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1223 continue;
1224 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1225 if (!base_obj->data)
1226 continue;
1227 if (check_sha1_signature(d->base.sha1, base_obj->data,
1229 base_obj->size, typename(type)))
1230 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1231 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1232 base_obj->data, base_obj->size, type);
1233 find_unresolved_deltas(base_obj);
1234 display_progress(progress, nr_resolved_deltas);
1235 }
1236 free(sorted_by_pos);
1237}
1238static void final(const char *final_pack_name, const char *curr_pack_name,
1240 const char *final_index_name, const char *curr_index_name,
1241 const char *keep_name, const char *keep_msg,
1242 unsigned char *sha1)
1243{
1244 const char *report = "pack";
1245 char name[PATH_MAX];
1246 int err;
1247 if (!from_stdin) {
1249 close(input_fd);
1250 } else {
1251 fsync_or_die(output_fd, curr_pack_name);
1252 err = close(output_fd);
1253 if (err)
1254 die_errno(_("error while closing pack file"));
1255 }
1256 if (keep_msg) {
1258 int keep_fd, keep_msg_len = strlen(keep_msg);
1259 if (!keep_name)
1261 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1262 else
1263 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1264 if (keep_fd < 0) {
1266 if (errno != EEXIST)
1267 die_errno(_("cannot write keep file '%s'"),
1268 keep_name);
1269 } else {
1270 if (keep_msg_len > 0) {
1271 write_or_die(keep_fd, keep_msg, keep_msg_len);
1272 write_or_die(keep_fd, "\n", 1);
1273 }
1274 if (close(keep_fd) != 0)
1275 die_errno(_("cannot close written keep file '%s'"),
1276 keep_name);
1277 report = "keep";
1278 }
1279 }
1280 if (final_pack_name != curr_pack_name) {
1282 if (!final_pack_name) {
1283 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1284 get_object_directory(), sha1_to_hex(sha1));
1285 final_pack_name = name;
1286 }
1287 if (move_temp_to_file(curr_pack_name, final_pack_name))
1288 die(_("cannot store pack file"));
1289 } else if (from_stdin)
1290 chmod(final_pack_name, 0444);
1291 if (final_index_name != curr_index_name) {
1293 if (!final_index_name) {
1294 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1295 get_object_directory(), sha1_to_hex(sha1));
1296 final_index_name = name;
1297 }
1298 if (move_temp_to_file(curr_index_name, final_index_name))
1299 die(_("cannot store index file"));
1300 } else
1301 chmod(final_index_name, 0444);
1302 if (!from_stdin) {
1304 printf("%s\n", sha1_to_hex(sha1));
1305 } else {
1306 char buf[48];
1307 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1308 report, sha1_to_hex(sha1));
1309 write_or_die(1, buf, len);
1310 /*
1312 * Let's just mimic git-unpack-objects here and write
1313 * the last part of the input buffer to stdout.
1314 */
1315 while (input_len) {
1316 err = xwrite(1, input_buffer + input_offset, input_len);
1317 if (err <= 0)
1318 break;
1319 input_len -= err;
1320 input_offset += err;
1321 }
1322 }
1323}
1324static int git_index_pack_config(const char *k, const char *v, void *cb)
1326{
1327 struct pack_idx_option *opts = cb;
1328 if (!strcmp(k, "pack.indexversion")) {
1330 opts->version = git_config_int(k, v);
1331 if (opts->version > 2)
1332 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1333 return 0;
1334 }
1335 if (!strcmp(k, "pack.threads")) {
1336 nr_threads = git_config_int(k, v);
1337 if (nr_threads < 0)
1338 die(_("invalid number of threads specified (%d)"),
1339 nr_threads);
1340#ifdef NO_PTHREADS
1341 if (nr_threads != 1)
1342 warning(_("no threads support, ignoring %s"), k);
1343 nr_threads = 1;
1344#endif
1345 return 0;
1346 }
1347 return git_default_config(k, v, cb);
1348}
1349static int cmp_uint32(const void *a_, const void *b_)
1351{
1352 uint32_t a = *((uint32_t *)a_);
1353 uint32_t b = *((uint32_t *)b_);
1354 return (a < b) ? -1 : (a != b);
1356}
1357static void read_v2_anomalous_offsets(struct packed_git *p,
1359 struct pack_idx_option *opts)
1360{
1361 const uint32_t *idx1, *idx2;
1362 uint32_t i;
1363 /* The address of the 4-byte offset table */
1365 idx1 = (((const uint32_t *)p->index_data)
1366 + 2 /* 8-byte header */
1367 + 256 /* fan out */
1368 + 5 * p->num_objects /* 20-byte SHA-1 table */
1369 + p->num_objects /* CRC32 table */
1370 );
1371 /* The address of the 8-byte offset table */
1373 idx2 = idx1 + p->num_objects;
1374 for (i = 0; i < p->num_objects; i++) {
1376 uint32_t off = ntohl(idx1[i]);
1377 if (!(off & 0x80000000))
1378 continue;
1379 off = off & 0x7fffffff;
1380 if (idx2[off * 2])
1381 continue;
1382 /*
1383 * The real offset is ntohl(idx2[off * 2]) in high 4
1384 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1385 * octets. But idx2[off * 2] is Zero!!!
1386 */
1387 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1388 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1389 }
1390 if (1 < opts->anomaly_nr)
1392 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1393}
1394static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1396{
1397 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1398 if (!p)
1400 die(_("Cannot open existing pack file '%s'"), pack_name);
1401 if (open_pack_index(p))
1402 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1403 /* Read the attributes from the existing idx file */
1405 opts->version = p->index_version;
1406 if (opts->version == 2)
1408 read_v2_anomalous_offsets(p, opts);
1409 /*
1411 * Get rid of the idx file as we do not need it anymore.
1412 * NEEDSWORK: extract this bit from free_pack_by_name() in
1413 * sha1_file.c, perhaps? It shouldn't matter very much as we
1414 * know we haven't installed this pack (hence we never have
1415 * read anything from it).
1416 */
1417 close_pack_index(p);
1418 free(p);
1419}
1420static void show_pack_info(int stat_only)
1422{
1423 int i, baseobjects = nr_objects - nr_deltas;
1424 unsigned long *chain_histogram = NULL;
1425 if (deepest_delta)
1427 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1428 for (i = 0; i < nr_objects; i++) {
1430 struct object_entry *obj = &objects[i];
1431 if (is_delta_type(obj->type))
1433 chain_histogram[obj->delta_depth - 1]++;
1434 if (stat_only)
1435 continue;
1436 printf("%s %-6s %lu %lu %"PRIuMAX,
1437 sha1_to_hex(obj->idx.sha1),
1438 typename(obj->real_type), obj->size,
1439 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1440 (uintmax_t)obj->idx.offset);
1441 if (is_delta_type(obj->type)) {
1442 struct object_entry *bobj = &objects[obj->base_object_no];
1443 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1444 }
1445 putchar('\n');
1446 }
1447 if (baseobjects)
1449 printf_ln(Q_("non delta: %d object",
1450 "non delta: %d objects",
1451 baseobjects),
1452 baseobjects);
1453 for (i = 0; i < deepest_delta; i++) {
1454 if (!chain_histogram[i])
1455 continue;
1456 printf_ln(Q_("chain length = %d: %lu object",
1457 "chain length = %d: %lu objects",
1458 chain_histogram[i]),
1459 i + 1,
1460 chain_histogram[i]);
1461 }
1462}
1463int cmd_index_pack(int argc, const char **argv, const char *prefix)
1465{
1466 int i, fix_thin_pack = 0, verify = 0, stat_only = 0, stat = 0;
1467 const char *curr_pack, *curr_index;
1468 const char *index_name = NULL, *pack_name = NULL;
1469 const char *keep_name = NULL, *keep_msg = NULL;
1470 char *index_name_buf = NULL, *keep_name_buf = NULL;
1471 struct pack_idx_entry **idx_objects;
1472 struct pack_idx_option opts;
1473 unsigned char pack_sha1[20];
1474 if (argc == 2 && !strcmp(argv[1], "-h"))
1476 usage(index_pack_usage);
1477 read_replace_refs = 0;
1479 reset_pack_idx_option(&opts);
1481 git_config(git_index_pack_config, &opts);
1482 if (prefix && chdir(prefix))
1483 die(_("Cannot come back to cwd"));
1484 for (i = 1; i < argc; i++) {
1486 const char *arg = argv[i];
1487 if (*arg == '-') {
1489 if (!strcmp(arg, "--stdin")) {
1490 from_stdin = 1;
1491 } else if (!strcmp(arg, "--fix-thin")) {
1492 fix_thin_pack = 1;
1493 } else if (!strcmp(arg, "--strict")) {
1494 strict = 1;
1495 } else if (!strcmp(arg, "--verify")) {
1496 verify = 1;
1497 } else if (!strcmp(arg, "--verify-stat")) {
1498 verify = 1;
1499 stat = 1;
1500 } else if (!strcmp(arg, "--verify-stat-only")) {
1501 verify = 1;
1502 stat = 1;
1503 stat_only = 1;
1504 } else if (!strcmp(arg, "--keep")) {
1505 keep_msg = "";
1506 } else if (!prefixcmp(arg, "--keep=")) {
1507 keep_msg = arg + 7;
1508 } else if (!prefixcmp(arg, "--threads=")) {
1509 char *end;
1510 nr_threads = strtoul(arg+10, &end, 0);
1511 if (!arg[10] || *end || nr_threads < 0)
1512 usage(index_pack_usage);
1513#ifdef NO_PTHREADS
1514 if (nr_threads != 1)
1515 warning(_("no threads support, "
1516 "ignoring %s"), arg);
1517 nr_threads = 1;
1518#endif
1519 } else if (!prefixcmp(arg, "--pack_header=")) {
1520 struct pack_header *hdr;
1521 char *c;
1522 hdr = (struct pack_header *)input_buffer;
1524 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1525 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1526 if (*c != ',')
1527 die(_("bad %s"), arg);
1528 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1529 if (*c)
1530 die(_("bad %s"), arg);
1531 input_len = sizeof(*hdr);
1532 } else if (!strcmp(arg, "-v")) {
1533 verbose = 1;
1534 } else if (!strcmp(arg, "-o")) {
1535 if (index_name || (i+1) >= argc)
1536 usage(index_pack_usage);
1537 index_name = argv[++i];
1538 } else if (!prefixcmp(arg, "--index-version=")) {
1539 char *c;
1540 opts.version = strtoul(arg + 16, &c, 10);
1541 if (opts.version > 2)
1542 die(_("bad %s"), arg);
1543 if (*c == ',')
1544 opts.off32_limit = strtoul(c+1, &c, 0);
1545 if (*c || opts.off32_limit & 0x80000000)
1546 die(_("bad %s"), arg);
1547 } else
1548 usage(index_pack_usage);
1549 continue;
1550 }
1551 if (pack_name)
1553 usage(index_pack_usage);
1554 pack_name = arg;
1555 }
1556 if (!pack_name && !from_stdin)
1558 usage(index_pack_usage);
1559 if (fix_thin_pack && !from_stdin)
1560 die(_("--fix-thin cannot be used without --stdin"));
1561 if (!index_name && pack_name) {
1562 int len = strlen(pack_name);
1563 if (!has_extension(pack_name, ".pack"))
1564 die(_("packfile name '%s' does not end with '.pack'"),
1565 pack_name);
1566 index_name_buf = xmalloc(len);
1567 memcpy(index_name_buf, pack_name, len - 5);
1568 strcpy(index_name_buf + len - 5, ".idx");
1569 index_name = index_name_buf;
1570 }
1571 if (keep_msg && !keep_name && pack_name) {
1572 int len = strlen(pack_name);
1573 if (!has_extension(pack_name, ".pack"))
1574 die(_("packfile name '%s' does not end with '.pack'"),
1575 pack_name);
1576 keep_name_buf = xmalloc(len);
1577 memcpy(keep_name_buf, pack_name, len - 5);
1578 strcpy(keep_name_buf + len - 5, ".keep");
1579 keep_name = keep_name_buf;
1580 }
1581 if (verify) {
1582 if (!index_name)
1583 die(_("--verify with no packfile name given"));
1584 read_idx_option(&opts, index_name);
1585 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1586 }
1587 if (strict)
1588 opts.flags |= WRITE_IDX_STRICT;
1589#ifndef NO_PTHREADS
1591 if (!nr_threads) {
1592 nr_threads = online_cpus();
1593 /* An experiment showed that more threads does not mean faster */
1594 if (nr_threads > 3)
1595 nr_threads = 3;
1596 }
1597#endif
1598 curr_pack = open_pack_file(pack_name);
1600 parse_pack_header();
1601 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1602 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1603 parse_pack_objects(pack_sha1);
1604 resolve_deltas();
1605 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1606 free(deltas);
1607 if (strict)
1608 check_objects();
1609 if (stat)
1611 show_pack_info(stat_only);
1612 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1614 for (i = 0; i < nr_objects; i++)
1615 idx_objects[i] = &objects[i].idx;
1616 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1617 free(idx_objects);
1618 if (!verify)
1620 final(pack_name, curr_pack,
1621 index_name, curr_index,
1622 keep_name, keep_msg,
1623 pack_sha1);
1624 else
1625 close(input_fd);
1626 free(objects);
1627 free(index_name_buf);
1628 free(keep_name_buf);
1629 if (pack_name == NULL)
1630 free((void *) curr_pack);
1631 if (index_name == NULL)
1632 free((void *) curr_index);
1633 return 0;
1635}