8fe9df5eba1322a0fc45883d2cf66bd8ca1614bb
1#include "builtin.h"
2#include "delta.h"
3#include "pack.h"
4#include "csum-file.h"
5#include "blob.h"
6#include "commit.h"
7#include "tag.h"
8#include "tree.h"
9#include "progress.h"
10#include "fsck.h"
11#include "exec_cmd.h"
12#include "streaming.h"
13#include "thread-utils.h"
14
15static const char index_pack_usage[] =
16"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
17
18struct object_entry {
19 struct pack_idx_entry idx;
20 unsigned long size;
21 unsigned int hdr_size;
22 enum object_type type;
23 enum object_type real_type;
24 unsigned delta_depth;
25 int base_object_no;
26};
27
28union delta_base {
29 unsigned char sha1[20];
30 off_t offset;
31};
32
33struct base_data {
34 struct base_data *base;
35 struct base_data *child;
36 struct object_entry *obj;
37 void *data;
38 unsigned long size;
39 int ref_first, ref_last;
40 int ofs_first, ofs_last;
41};
42
43#if !defined(NO_PTHREADS) && defined(NO_THREAD_SAFE_PREAD)
44/* pread() emulation is not thread-safe. Disable threading. */
45#define NO_PTHREADS
46#endif
47
48struct 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
56/*
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
62#define FLAG_LINK (1u<<20)
63#define FLAG_CHECKED (1u<<21)
64
65struct delta_entry {
66 union delta_base base;
67 int obj_no;
68};
69
70static 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;
77
78static int from_stdin;
79static int strict;
80static int verbose;
81static int show_stat;
82
83static struct progress *progress;
84
85/* We always read in 4kB chunks. */
86static unsigned char input_buffer[4096];
87static unsigned int input_offset, input_len;
88static off_t consumed_bytes;
89static unsigned deepest_delta;
90static git_SHA_CTX input_ctx;
91static uint32_t input_crc32;
92static int input_fd, output_fd, pack_fd;
93
94#ifndef NO_PTHREADS
95
96static struct thread_local *thread_data;
97static int nr_dispatched;
98static int threads_active;
99
100static pthread_mutex_t read_mutex;
101#define read_lock() lock_mutex(&read_mutex)
102#define read_unlock() unlock_mutex(&read_mutex)
103
104static pthread_mutex_t counter_mutex;
105#define counter_lock() lock_mutex(&counter_mutex)
106#define counter_unlock() unlock_mutex(&counter_mutex)
107
108static pthread_mutex_t work_mutex;
109#define work_lock() lock_mutex(&work_mutex)
110#define work_unlock() unlock_mutex(&work_mutex)
111
112static pthread_mutex_t deepest_delta_mutex;
113#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
114#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
115
116static pthread_key_t key;
117
118static inline void lock_mutex(pthread_mutex_t *mutex)
119{
120 if (threads_active)
121 pthread_mutex_lock(mutex);
122}
123
124static inline void unlock_mutex(pthread_mutex_t *mutex)
125{
126 if (threads_active)
127 pthread_mutex_unlock(mutex);
128}
129
130/*
131 * Mutex and conditional variable can't be statically-initialized on Windows.
132 */
133static void init_thread(void)
134{
135 init_recursive_mutex(&read_mutex);
136 pthread_mutex_init(&counter_mutex, NULL);
137 pthread_mutex_init(&work_mutex, NULL);
138 if (show_stat)
139 pthread_mutex_init(&deepest_delta_mutex, NULL);
140 pthread_key_create(&key, NULL);
141 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
142 threads_active = 1;
143}
144
145static void cleanup_thread(void)
146{
147 if (!threads_active)
148 return;
149 threads_active = 0;
150 pthread_mutex_destroy(&read_mutex);
151 pthread_mutex_destroy(&counter_mutex);
152 pthread_mutex_destroy(&work_mutex);
153 if (show_stat)
154 pthread_mutex_destroy(&deepest_delta_mutex);
155 pthread_key_delete(key);
156 free(thread_data);
157}
158
159#else
160
161#define read_lock()
162#define read_unlock()
163
164#define counter_lock()
165#define counter_unlock()
166
167#define work_lock()
168#define work_unlock()
169
170#define deepest_delta_lock()
171#define deepest_delta_unlock()
172
173#endif
174
175
176static int mark_link(struct object *obj, int type, void *data)
177{
178 if (!obj)
179 return -1;
180
181 if (type != OBJ_ANY && obj->type != type)
182 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
183
184 obj->flags |= FLAG_LINK;
185 return 0;
186}
187
188/* The content of each linked object must have been checked
189 or it must be already present in the object database */
190static void check_object(struct object *obj)
191{
192 if (!obj)
193 return;
194
195 if (!(obj->flags & FLAG_LINK))
196 return;
197
198 if (!(obj->flags & FLAG_CHECKED)) {
199 unsigned long size;
200 int type = sha1_object_info(obj->sha1, &size);
201 if (type != obj->type || type <= 0)
202 die(_("object of unexpected type"));
203 obj->flags |= FLAG_CHECKED;
204 return;
205 }
206}
207
208static void check_objects(void)
209{
210 unsigned i, max;
211
212 max = get_max_object_index();
213 for (i = 0; i < max; i++)
214 check_object(get_indexed_object(i));
215}
216
217
218/* Discard current buffer used content. */
219static void flush(void)
220{
221 if (input_offset) {
222 if (output_fd >= 0)
223 write_or_die(output_fd, input_buffer, input_offset);
224 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
225 memmove(input_buffer, input_buffer + input_offset, input_len);
226 input_offset = 0;
227 }
228}
229
230/*
231 * Make sure at least "min" bytes are available in the buffer, and
232 * return the pointer to the buffer.
233 */
234static void *fill(int min)
235{
236 if (min <= input_len)
237 return input_buffer + input_offset;
238 if (min > sizeof(input_buffer))
239 die(Q_("cannot fill %d byte",
240 "cannot fill %d bytes",
241 min),
242 min);
243 flush();
244 do {
245 ssize_t ret = xread(input_fd, input_buffer + input_len,
246 sizeof(input_buffer) - input_len);
247 if (ret <= 0) {
248 if (!ret)
249 die(_("early EOF"));
250 die_errno(_("read error on input"));
251 }
252 input_len += ret;
253 if (from_stdin)
254 display_throughput(progress, consumed_bytes + input_len);
255 } while (input_len < min);
256 return input_buffer;
257}
258
259static void use(int bytes)
260{
261 if (bytes > input_len)
262 die(_("used more bytes than were available"));
263 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
264 input_len -= bytes;
265 input_offset += bytes;
266
267 /* make sure off_t is sufficiently large not to wrap */
268 if (signed_add_overflows(consumed_bytes, bytes))
269 die(_("pack too large for current definition of off_t"));
270 consumed_bytes += bytes;
271}
272
273static const char *open_pack_file(const char *pack_name)
274{
275 if (from_stdin) {
276 input_fd = 0;
277 if (!pack_name) {
278 static char tmp_file[PATH_MAX];
279 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
280 "pack/tmp_pack_XXXXXX");
281 pack_name = xstrdup(tmp_file);
282 } else
283 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
284 if (output_fd < 0)
285 die_errno(_("unable to create '%s'"), pack_name);
286 pack_fd = output_fd;
287 } else {
288 input_fd = open(pack_name, O_RDONLY);
289 if (input_fd < 0)
290 die_errno(_("cannot open packfile '%s'"), pack_name);
291 output_fd = -1;
292 pack_fd = input_fd;
293 }
294 git_SHA1_Init(&input_ctx);
295 return pack_name;
296}
297
298static void parse_pack_header(void)
299{
300 struct pack_header *hdr = fill(sizeof(struct pack_header));
301
302 /* Header consistency check */
303 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
304 die(_("pack signature mismatch"));
305 if (!pack_version_ok(hdr->hdr_version))
306 die("pack version %"PRIu32" unsupported",
307 ntohl(hdr->hdr_version));
308
309 nr_objects = ntohl(hdr->hdr_entries);
310 use(sizeof(struct pack_header));
311}
312
313static NORETURN void bad_object(unsigned long offset, const char *format,
314 ...) __attribute__((format (printf, 2, 3)));
315
316static NORETURN void bad_object(unsigned long offset, const char *format, ...)
317{
318 va_list params;
319 char buf[1024];
320
321 va_start(params, format);
322 vsnprintf(buf, sizeof(buf), format, params);
323 va_end(params);
324 die(_("pack has bad object at offset %lu: %s"), offset, buf);
325}
326
327static inline struct thread_local *get_thread_data(void)
328{
329#ifndef NO_PTHREADS
330 if (threads_active)
331 return pthread_getspecific(key);
332 assert(!threads_active &&
333 "This should only be reached when all threads are gone");
334#endif
335 return ¬hread_data;
336}
337
338#ifndef NO_PTHREADS
339static void set_thread_data(struct thread_local *data)
340{
341 if (threads_active)
342 pthread_setspecific(key, data);
343}
344#endif
345
346static struct base_data *alloc_base_data(void)
347{
348 struct base_data *base = xmalloc(sizeof(struct base_data));
349 memset(base, 0, sizeof(*base));
350 base->ref_last = -1;
351 base->ofs_last = -1;
352 return base;
353}
354
355static void free_base_data(struct base_data *c)
356{
357 if (c->data) {
358 free(c->data);
359 c->data = NULL;
360 get_thread_data()->base_cache_used -= c->size;
361 }
362}
363
364static void prune_base_data(struct base_data *retain)
365{
366 struct base_data *b;
367 struct thread_local *data = get_thread_data();
368 for (b = data->base_cache;
369 data->base_cache_used > delta_base_cache_limit && b;
370 b = b->child) {
371 if (b->data && b != retain)
372 free_base_data(b);
373 }
374}
375
376static void link_base_data(struct base_data *base, struct base_data *c)
377{
378 if (base)
379 base->child = c;
380 else
381 get_thread_data()->base_cache = c;
382
383 c->base = base;
384 c->child = NULL;
385 if (c->data)
386 get_thread_data()->base_cache_used += c->size;
387 prune_base_data(c);
388}
389
390static void unlink_base_data(struct base_data *c)
391{
392 struct base_data *base = c->base;
393 if (base)
394 base->child = NULL;
395 else
396 get_thread_data()->base_cache = NULL;
397 free_base_data(c);
398}
399
400static int is_delta_type(enum object_type type)
401{
402 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
403}
404
405static void *unpack_entry_data(unsigned long offset, unsigned long size,
406 enum object_type type, unsigned char *sha1)
407{
408 static char fixed_buf[8192];
409 int status;
410 git_zstream stream;
411 void *buf;
412 git_SHA_CTX c;
413 char hdr[32];
414 int hdrlen;
415
416 if (!is_delta_type(type)) {
417 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
418 git_SHA1_Init(&c);
419 git_SHA1_Update(&c, hdr, hdrlen);
420 } else
421 sha1 = NULL;
422 if (type == OBJ_BLOB && size > big_file_threshold)
423 buf = fixed_buf;
424 else
425 buf = xmalloc(size);
426
427 memset(&stream, 0, sizeof(stream));
428 git_inflate_init(&stream);
429 stream.next_out = buf;
430 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
431
432 do {
433 unsigned char *last_out = stream.next_out;
434 stream.next_in = fill(1);
435 stream.avail_in = input_len;
436 status = git_inflate(&stream, 0);
437 use(input_len - stream.avail_in);
438 if (sha1)
439 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
440 if (buf == fixed_buf) {
441 stream.next_out = buf;
442 stream.avail_out = sizeof(fixed_buf);
443 }
444 } while (status == Z_OK);
445 if (stream.total_out != size || status != Z_STREAM_END)
446 bad_object(offset, _("inflate returned %d"), status);
447 git_inflate_end(&stream);
448 if (sha1)
449 git_SHA1_Final(sha1, &c);
450 return buf == fixed_buf ? NULL : buf;
451}
452
453static void *unpack_raw_entry(struct object_entry *obj,
454 union delta_base *delta_base,
455 unsigned char *sha1)
456{
457 unsigned char *p;
458 unsigned long size, c;
459 off_t base_offset;
460 unsigned shift;
461 void *data;
462
463 obj->idx.offset = consumed_bytes;
464 input_crc32 = crc32(0, NULL, 0);
465
466 p = fill(1);
467 c = *p;
468 use(1);
469 obj->type = (c >> 4) & 7;
470 size = (c & 15);
471 shift = 4;
472 while (c & 0x80) {
473 p = fill(1);
474 c = *p;
475 use(1);
476 size += (c & 0x7f) << shift;
477 shift += 7;
478 }
479 obj->size = size;
480
481 switch (obj->type) {
482 case OBJ_REF_DELTA:
483 hashcpy(delta_base->sha1, fill(20));
484 use(20);
485 break;
486 case OBJ_OFS_DELTA:
487 memset(delta_base, 0, sizeof(*delta_base));
488 p = fill(1);
489 c = *p;
490 use(1);
491 base_offset = c & 127;
492 while (c & 128) {
493 base_offset += 1;
494 if (!base_offset || MSB(base_offset, 7))
495 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
496 p = fill(1);
497 c = *p;
498 use(1);
499 base_offset = (base_offset << 7) + (c & 127);
500 }
501 delta_base->offset = obj->idx.offset - base_offset;
502 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
503 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
504 break;
505 case OBJ_COMMIT:
506 case OBJ_TREE:
507 case OBJ_BLOB:
508 case OBJ_TAG:
509 break;
510 default:
511 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
512 }
513 obj->hdr_size = consumed_bytes - obj->idx.offset;
514
515 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
516 obj->idx.crc32 = input_crc32;
517 return data;
518}
519
520static void *unpack_data(struct object_entry *obj,
521 int (*consume)(const unsigned char *, unsigned long, void *),
522 void *cb_data)
523{
524 off_t from = obj[0].idx.offset + obj[0].hdr_size;
525 unsigned long len = obj[1].idx.offset - from;
526 unsigned char *data, *inbuf;
527 git_zstream stream;
528 int status;
529
530 data = xmalloc(consume ? 64*1024 : obj->size);
531 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
532
533 memset(&stream, 0, sizeof(stream));
534 git_inflate_init(&stream);
535 stream.next_out = data;
536 stream.avail_out = consume ? 64*1024 : obj->size;
537
538 do {
539 ssize_t n = (len < 64*1024) ? len : 64*1024;
540 n = pread(pack_fd, inbuf, n, from);
541 if (n < 0)
542 die_errno(_("cannot pread pack file"));
543 if (!n)
544 die(Q_("premature end of pack file, %lu byte missing",
545 "premature end of pack file, %lu bytes missing",
546 len),
547 len);
548 from += n;
549 len -= n;
550 stream.next_in = inbuf;
551 stream.avail_in = n;
552 if (!consume)
553 status = git_inflate(&stream, 0);
554 else {
555 do {
556 status = git_inflate(&stream, 0);
557 if (consume(data, stream.next_out - data, cb_data)) {
558 free(inbuf);
559 free(data);
560 return NULL;
561 }
562 stream.next_out = data;
563 stream.avail_out = 64*1024;
564 } while (status == Z_OK && stream.avail_in);
565 }
566 } while (len && status == Z_OK && !stream.avail_in);
567
568 /* This has been inflated OK when first encountered, so... */
569 if (status != Z_STREAM_END || stream.total_out != obj->size)
570 die(_("serious inflate inconsistency"));
571
572 git_inflate_end(&stream);
573 free(inbuf);
574 if (consume) {
575 free(data);
576 data = NULL;
577 }
578 return data;
579}
580
581static void *get_data_from_pack(struct object_entry *obj)
582{
583 return unpack_data(obj, NULL, NULL);
584}
585
586static int compare_delta_bases(const union delta_base *base1,
587 const union delta_base *base2,
588 enum object_type type1,
589 enum object_type type2)
590{
591 int cmp = type1 - type2;
592 if (cmp)
593 return cmp;
594 return memcmp(base1, base2, UNION_BASE_SZ);
595}
596
597static int find_delta(const union delta_base *base, enum object_type type)
598{
599 int first = 0, last = nr_deltas;
600
601 while (first < last) {
602 int next = (first + last) / 2;
603 struct delta_entry *delta = &deltas[next];
604 int cmp;
605
606 cmp = compare_delta_bases(base, &delta->base,
607 type, objects[delta->obj_no].type);
608 if (!cmp)
609 return next;
610 if (cmp < 0) {
611 last = next;
612 continue;
613 }
614 first = next+1;
615 }
616 return -first-1;
617}
618
619static void find_delta_children(const union delta_base *base,
620 int *first_index, int *last_index,
621 enum object_type type)
622{
623 int first = find_delta(base, type);
624 int last = first;
625 int end = nr_deltas - 1;
626
627 if (first < 0) {
628 *first_index = 0;
629 *last_index = -1;
630 return;
631 }
632 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
633 --first;
634 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
635 ++last;
636 *first_index = first;
637 *last_index = last;
638}
639
640struct compare_data {
641 struct object_entry *entry;
642 struct git_istream *st;
643 unsigned char *buf;
644 unsigned long buf_size;
645};
646
647static int compare_objects(const unsigned char *buf, unsigned long size,
648 void *cb_data)
649{
650 struct compare_data *data = cb_data;
651
652 if (data->buf_size < size) {
653 free(data->buf);
654 data->buf = xmalloc(size);
655 data->buf_size = size;
656 }
657
658 while (size) {
659 ssize_t len = read_istream(data->st, data->buf, size);
660 if (len == 0)
661 die(_("SHA1 COLLISION FOUND WITH %s !"),
662 sha1_to_hex(data->entry->idx.sha1));
663 if (len < 0)
664 die(_("unable to read %s"),
665 sha1_to_hex(data->entry->idx.sha1));
666 if (memcmp(buf, data->buf, len))
667 die(_("SHA1 COLLISION FOUND WITH %s !"),
668 sha1_to_hex(data->entry->idx.sha1));
669 size -= len;
670 buf += len;
671 }
672 return 0;
673}
674
675static int check_collison(struct object_entry *entry)
676{
677 struct compare_data data;
678 enum object_type type;
679 unsigned long size;
680
681 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
682 return -1;
683
684 memset(&data, 0, sizeof(data));
685 data.entry = entry;
686 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
687 if (!data.st)
688 return -1;
689 if (size != entry->size || type != entry->type)
690 die(_("SHA1 COLLISION FOUND WITH %s !"),
691 sha1_to_hex(entry->idx.sha1));
692 unpack_data(entry, compare_objects, &data);
693 close_istream(data.st);
694 free(data.buf);
695 return 0;
696}
697
698static void sha1_object(const void *data, struct object_entry *obj_entry,
699 unsigned long size, enum object_type type,
700 const unsigned char *sha1)
701{
702 void *new_data = NULL;
703 int collision_test_needed;
704
705 assert(data || obj_entry);
706
707 read_lock();
708 collision_test_needed = has_sha1_file(sha1);
709 read_unlock();
710
711 if (collision_test_needed && !data) {
712 read_lock();
713 if (!check_collison(obj_entry))
714 collision_test_needed = 0;
715 read_unlock();
716 }
717 if (collision_test_needed) {
718 void *has_data;
719 enum object_type has_type;
720 unsigned long has_size;
721 read_lock();
722 has_type = sha1_object_info(sha1, &has_size);
723 if (has_type != type || has_size != size)
724 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
725 has_data = read_sha1_file(sha1, &has_type, &has_size);
726 read_unlock();
727 if (!data)
728 data = new_data = get_data_from_pack(obj_entry);
729 if (!has_data)
730 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
731 if (size != has_size || type != has_type ||
732 memcmp(data, has_data, size) != 0)
733 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
734 free(has_data);
735 }
736
737 if (strict) {
738 read_lock();
739 if (type == OBJ_BLOB) {
740 struct blob *blob = lookup_blob(sha1);
741 if (blob)
742 blob->object.flags |= FLAG_CHECKED;
743 else
744 die(_("invalid blob object %s"), sha1_to_hex(sha1));
745 } else {
746 struct object *obj;
747 int eaten;
748 void *buf = (void *) data;
749
750 if (!buf)
751 buf = new_data = get_data_from_pack(obj_entry);
752
753 /*
754 * we do not need to free the memory here, as the
755 * buf is deleted by the caller.
756 */
757 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
758 if (!obj)
759 die(_("invalid %s"), typename(type));
760 if (fsck_object(obj, 1, fsck_error_function))
761 die(_("Error in object"));
762 if (fsck_walk(obj, mark_link, NULL))
763 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
764
765 if (obj->type == OBJ_TREE) {
766 struct tree *item = (struct tree *) obj;
767 item->buffer = NULL;
768 }
769 if (obj->type == OBJ_COMMIT) {
770 struct commit *commit = (struct commit *) obj;
771 commit->buffer = NULL;
772 }
773 obj->flags |= FLAG_CHECKED;
774 }
775 read_unlock();
776 }
777
778 free(new_data);
779}
780
781/*
782 * This function is part of find_unresolved_deltas(). There are two
783 * walkers going in the opposite ways.
784 *
785 * The first one in find_unresolved_deltas() traverses down from
786 * parent node to children, deflating nodes along the way. However,
787 * memory for deflated nodes is limited by delta_base_cache_limit, so
788 * at some point parent node's deflated content may be freed.
789 *
790 * The second walker is this function, which goes from current node up
791 * to top parent if necessary to deflate the node. In normal
792 * situation, its parent node would be already deflated, so it just
793 * needs to apply delta.
794 *
795 * In the worst case scenario, parent node is no longer deflated because
796 * we're running out of delta_base_cache_limit; we need to re-deflate
797 * parents, possibly up to the top base.
798 *
799 * All deflated objects here are subject to be freed if we exceed
800 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
801 * just need to make sure the last node is not freed.
802 */
803static void *get_base_data(struct base_data *c)
804{
805 if (!c->data) {
806 struct object_entry *obj = c->obj;
807 struct base_data **delta = NULL;
808 int delta_nr = 0, delta_alloc = 0;
809
810 while (is_delta_type(c->obj->type) && !c->data) {
811 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
812 delta[delta_nr++] = c;
813 c = c->base;
814 }
815 if (!delta_nr) {
816 c->data = get_data_from_pack(obj);
817 c->size = obj->size;
818 get_thread_data()->base_cache_used += c->size;
819 prune_base_data(c);
820 }
821 for (; delta_nr > 0; delta_nr--) {
822 void *base, *raw;
823 c = delta[delta_nr - 1];
824 obj = c->obj;
825 base = get_base_data(c->base);
826 raw = get_data_from_pack(obj);
827 c->data = patch_delta(
828 base, c->base->size,
829 raw, obj->size,
830 &c->size);
831 free(raw);
832 if (!c->data)
833 bad_object(obj->idx.offset, _("failed to apply delta"));
834 get_thread_data()->base_cache_used += c->size;
835 prune_base_data(c);
836 }
837 free(delta);
838 }
839 return c->data;
840}
841
842static void resolve_delta(struct object_entry *delta_obj,
843 struct base_data *base, struct base_data *result)
844{
845 void *base_data, *delta_data;
846
847 delta_obj->real_type = base->obj->real_type;
848 if (show_stat) {
849 delta_obj->delta_depth = base->obj->delta_depth + 1;
850 deepest_delta_lock();
851 if (deepest_delta < delta_obj->delta_depth)
852 deepest_delta = delta_obj->delta_depth;
853 deepest_delta_unlock();
854 }
855 delta_obj->base_object_no = base->obj - objects;
856 delta_data = get_data_from_pack(delta_obj);
857 base_data = get_base_data(base);
858 result->obj = delta_obj;
859 result->data = patch_delta(base_data, base->size,
860 delta_data, delta_obj->size, &result->size);
861 free(delta_data);
862 if (!result->data)
863 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
864 hash_sha1_file(result->data, result->size,
865 typename(delta_obj->real_type), delta_obj->idx.sha1);
866 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
867 delta_obj->idx.sha1);
868 counter_lock();
869 nr_resolved_deltas++;
870 counter_unlock();
871}
872
873static struct base_data *find_unresolved_deltas_1(struct base_data *base,
874 struct base_data *prev_base)
875{
876 if (base->ref_last == -1 && base->ofs_last == -1) {
877 union delta_base base_spec;
878
879 hashcpy(base_spec.sha1, base->obj->idx.sha1);
880 find_delta_children(&base_spec,
881 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
882
883 memset(&base_spec, 0, sizeof(base_spec));
884 base_spec.offset = base->obj->idx.offset;
885 find_delta_children(&base_spec,
886 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
887
888 if (base->ref_last == -1 && base->ofs_last == -1) {
889 free(base->data);
890 return NULL;
891 }
892
893 link_base_data(prev_base, base);
894 }
895
896 if (base->ref_first <= base->ref_last) {
897 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
898 struct base_data *result = alloc_base_data();
899
900 assert(child->real_type == OBJ_REF_DELTA);
901 resolve_delta(child, base, result);
902 if (base->ref_first == base->ref_last && base->ofs_last == -1)
903 free_base_data(base);
904
905 base->ref_first++;
906 return result;
907 }
908
909 if (base->ofs_first <= base->ofs_last) {
910 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
911 struct base_data *result = alloc_base_data();
912
913 assert(child->real_type == OBJ_OFS_DELTA);
914 resolve_delta(child, base, result);
915 if (base->ofs_first == base->ofs_last)
916 free_base_data(base);
917
918 base->ofs_first++;
919 return result;
920 }
921
922 unlink_base_data(base);
923 return NULL;
924}
925
926static void find_unresolved_deltas(struct base_data *base)
927{
928 struct base_data *new_base, *prev_base = NULL;
929 for (;;) {
930 new_base = find_unresolved_deltas_1(base, prev_base);
931
932 if (new_base) {
933 prev_base = base;
934 base = new_base;
935 } else {
936 free(base);
937 base = prev_base;
938 if (!base)
939 return;
940 prev_base = base->base;
941 }
942 }
943}
944
945static int compare_delta_entry(const void *a, const void *b)
946{
947 const struct delta_entry *delta_a = a;
948 const struct delta_entry *delta_b = b;
949
950 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
951 return compare_delta_bases(&delta_a->base, &delta_b->base,
952 objects[delta_a->obj_no].type,
953 objects[delta_b->obj_no].type);
954}
955
956static void resolve_base(struct object_entry *obj)
957{
958 struct base_data *base_obj = alloc_base_data();
959 base_obj->obj = obj;
960 base_obj->data = NULL;
961 find_unresolved_deltas(base_obj);
962}
963
964#ifndef NO_PTHREADS
965static void *threaded_second_pass(void *data)
966{
967 set_thread_data(data);
968 for (;;) {
969 int i;
970 work_lock();
971 display_progress(progress, nr_resolved_deltas);
972 while (nr_dispatched < nr_objects &&
973 is_delta_type(objects[nr_dispatched].type))
974 nr_dispatched++;
975 if (nr_dispatched >= nr_objects) {
976 work_unlock();
977 break;
978 }
979 i = nr_dispatched++;
980 work_unlock();
981
982 resolve_base(&objects[i]);
983 }
984 return NULL;
985}
986#endif
987
988/*
989 * First pass:
990 * - find locations of all objects;
991 * - calculate SHA1 of all non-delta objects;
992 * - remember base (SHA1 or offset) for all deltas.
993 */
994static void parse_pack_objects(unsigned char *sha1)
995{
996 int i, nr_delays = 0;
997 struct delta_entry *delta = deltas;
998 struct stat st;
999
1000 if (verbose)
1001 progress = start_progress(
1002 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1003 nr_objects);
1004 for (i = 0; i < nr_objects; i++) {
1005 struct object_entry *obj = &objects[i];
1006 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
1007 obj->real_type = obj->type;
1008 if (is_delta_type(obj->type)) {
1009 nr_deltas++;
1010 delta->obj_no = i;
1011 delta++;
1012 } else if (!data) {
1013 /* large blobs, check later */
1014 obj->real_type = OBJ_BAD;
1015 nr_delays++;
1016 } else
1017 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1018 free(data);
1019 display_progress(progress, i+1);
1020 }
1021 objects[i].idx.offset = consumed_bytes;
1022 stop_progress(&progress);
1023
1024 /* Check pack integrity */
1025 flush();
1026 git_SHA1_Final(sha1, &input_ctx);
1027 if (hashcmp(fill(20), sha1))
1028 die(_("pack is corrupted (SHA1 mismatch)"));
1029 use(20);
1030
1031 /* If input_fd is a file, we should have reached its end now. */
1032 if (fstat(input_fd, &st))
1033 die_errno(_("cannot fstat packfile"));
1034 if (S_ISREG(st.st_mode) &&
1035 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1036 die(_("pack has junk at the end"));
1037
1038 for (i = 0; i < nr_objects; i++) {
1039 struct object_entry *obj = &objects[i];
1040 if (obj->real_type != OBJ_BAD)
1041 continue;
1042 obj->real_type = obj->type;
1043 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1044 nr_delays--;
1045 }
1046 if (nr_delays)
1047 die(_("confusion beyond insanity in parse_pack_objects()"));
1048}
1049
1050/*
1051 * Second pass:
1052 * - for all non-delta objects, look if it is used as a base for
1053 * deltas;
1054 * - if used as a base, uncompress the object and apply all deltas,
1055 * recursively checking if the resulting object is used as a base
1056 * for some more deltas.
1057 */
1058static void resolve_deltas(void)
1059{
1060 int i;
1061
1062 if (!nr_deltas)
1063 return;
1064
1065 /* Sort deltas by base SHA1/offset for fast searching */
1066 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1067 compare_delta_entry);
1068
1069 if (verbose)
1070 progress = start_progress(_("Resolving deltas"), nr_deltas);
1071
1072#ifndef NO_PTHREADS
1073 nr_dispatched = 0;
1074 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1075 init_thread();
1076 for (i = 0; i < nr_threads; i++) {
1077 int ret = pthread_create(&thread_data[i].thread, NULL,
1078 threaded_second_pass, thread_data + i);
1079 if (ret)
1080 die("unable to create thread: %s", strerror(ret));
1081 }
1082 for (i = 0; i < nr_threads; i++)
1083 pthread_join(thread_data[i].thread, NULL);
1084 cleanup_thread();
1085 return;
1086 }
1087#endif
1088
1089 for (i = 0; i < nr_objects; i++) {
1090 struct object_entry *obj = &objects[i];
1091
1092 if (is_delta_type(obj->type))
1093 continue;
1094 resolve_base(obj);
1095 display_progress(progress, nr_resolved_deltas);
1096 }
1097}
1098
1099/*
1100 * Third pass:
1101 * - append objects to convert thin pack to full pack if required
1102 * - write the final 20-byte SHA-1
1103 */
1104static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1105static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1106{
1107 if (nr_deltas == nr_resolved_deltas) {
1108 stop_progress(&progress);
1109 /* Flush remaining pack final 20-byte SHA1. */
1110 flush();
1111 return;
1112 }
1113
1114 if (fix_thin_pack) {
1115 struct sha1file *f;
1116 unsigned char read_sha1[20], tail_sha1[20];
1117 char msg[48];
1118 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1119 int nr_objects_initial = nr_objects;
1120 if (nr_unresolved <= 0)
1121 die(_("confusion beyond insanity"));
1122 objects = xrealloc(objects,
1123 (nr_objects + nr_unresolved + 1)
1124 * sizeof(*objects));
1125 f = sha1fd(output_fd, curr_pack);
1126 fix_unresolved_deltas(f, nr_unresolved);
1127 sprintf(msg, "completed with %d local objects",
1128 nr_objects - nr_objects_initial);
1129 stop_progress_msg(&progress, msg);
1130 sha1close(f, tail_sha1, 0);
1131 hashcpy(read_sha1, pack_sha1);
1132 fixup_pack_header_footer(output_fd, pack_sha1,
1133 curr_pack, nr_objects,
1134 read_sha1, consumed_bytes-20);
1135 if (hashcmp(read_sha1, tail_sha1) != 0)
1136 die("Unexpected tail checksum for %s "
1137 "(disk corruption?)", curr_pack);
1138 }
1139 if (nr_deltas != nr_resolved_deltas)
1140 die(Q_("pack has %d unresolved delta",
1141 "pack has %d unresolved deltas",
1142 nr_deltas - nr_resolved_deltas),
1143 nr_deltas - nr_resolved_deltas);
1144}
1145
1146static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1147{
1148 git_zstream stream;
1149 int status;
1150 unsigned char outbuf[4096];
1151
1152 memset(&stream, 0, sizeof(stream));
1153 git_deflate_init(&stream, zlib_compression_level);
1154 stream.next_in = in;
1155 stream.avail_in = size;
1156
1157 do {
1158 stream.next_out = outbuf;
1159 stream.avail_out = sizeof(outbuf);
1160 status = git_deflate(&stream, Z_FINISH);
1161 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1162 } while (status == Z_OK);
1163
1164 if (status != Z_STREAM_END)
1165 die(_("unable to deflate appended object (%d)"), status);
1166 size = stream.total_out;
1167 git_deflate_end(&stream);
1168 return size;
1169}
1170
1171static struct object_entry *append_obj_to_pack(struct sha1file *f,
1172 const unsigned char *sha1, void *buf,
1173 unsigned long size, enum object_type type)
1174{
1175 struct object_entry *obj = &objects[nr_objects++];
1176 unsigned char header[10];
1177 unsigned long s = size;
1178 int n = 0;
1179 unsigned char c = (type << 4) | (s & 15);
1180 s >>= 4;
1181 while (s) {
1182 header[n++] = c | 0x80;
1183 c = s & 0x7f;
1184 s >>= 7;
1185 }
1186 header[n++] = c;
1187 crc32_begin(f);
1188 sha1write(f, header, n);
1189 obj[0].size = size;
1190 obj[0].hdr_size = n;
1191 obj[0].type = type;
1192 obj[0].real_type = type;
1193 obj[1].idx.offset = obj[0].idx.offset + n;
1194 obj[1].idx.offset += write_compressed(f, buf, size);
1195 obj[0].idx.crc32 = crc32_end(f);
1196 sha1flush(f);
1197 hashcpy(obj->idx.sha1, sha1);
1198 return obj;
1199}
1200
1201static int delta_pos_compare(const void *_a, const void *_b)
1202{
1203 struct delta_entry *a = *(struct delta_entry **)_a;
1204 struct delta_entry *b = *(struct delta_entry **)_b;
1205 return a->obj_no - b->obj_no;
1206}
1207
1208static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1209{
1210 struct delta_entry **sorted_by_pos;
1211 int i, n = 0;
1212
1213 /*
1214 * Since many unresolved deltas may well be themselves base objects
1215 * for more unresolved deltas, we really want to include the
1216 * smallest number of base objects that would cover as much delta
1217 * as possible by picking the
1218 * trunc deltas first, allowing for other deltas to resolve without
1219 * additional base objects. Since most base objects are to be found
1220 * before deltas depending on them, a good heuristic is to start
1221 * resolving deltas in the same order as their position in the pack.
1222 */
1223 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1224 for (i = 0; i < nr_deltas; i++) {
1225 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1226 continue;
1227 sorted_by_pos[n++] = &deltas[i];
1228 }
1229 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1230
1231 for (i = 0; i < n; i++) {
1232 struct delta_entry *d = sorted_by_pos[i];
1233 enum object_type type;
1234 struct base_data *base_obj = alloc_base_data();
1235
1236 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1237 continue;
1238 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1239 if (!base_obj->data)
1240 continue;
1241
1242 if (check_sha1_signature(d->base.sha1, base_obj->data,
1243 base_obj->size, typename(type)))
1244 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1245 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1246 base_obj->data, base_obj->size, type);
1247 find_unresolved_deltas(base_obj);
1248 display_progress(progress, nr_resolved_deltas);
1249 }
1250 free(sorted_by_pos);
1251}
1252
1253static void final(const char *final_pack_name, const char *curr_pack_name,
1254 const char *final_index_name, const char *curr_index_name,
1255 const char *keep_name, const char *keep_msg,
1256 unsigned char *sha1)
1257{
1258 const char *report = "pack";
1259 char name[PATH_MAX];
1260 int err;
1261
1262 if (!from_stdin) {
1263 close(input_fd);
1264 } else {
1265 fsync_or_die(output_fd, curr_pack_name);
1266 err = close(output_fd);
1267 if (err)
1268 die_errno(_("error while closing pack file"));
1269 }
1270
1271 if (keep_msg) {
1272 int keep_fd, keep_msg_len = strlen(keep_msg);
1273
1274 if (!keep_name)
1275 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1276 else
1277 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1278
1279 if (keep_fd < 0) {
1280 if (errno != EEXIST)
1281 die_errno(_("cannot write keep file '%s'"),
1282 keep_name);
1283 } else {
1284 if (keep_msg_len > 0) {
1285 write_or_die(keep_fd, keep_msg, keep_msg_len);
1286 write_or_die(keep_fd, "\n", 1);
1287 }
1288 if (close(keep_fd) != 0)
1289 die_errno(_("cannot close written keep file '%s'"),
1290 keep_name);
1291 report = "keep";
1292 }
1293 }
1294
1295 if (final_pack_name != curr_pack_name) {
1296 if (!final_pack_name) {
1297 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1298 get_object_directory(), sha1_to_hex(sha1));
1299 final_pack_name = name;
1300 }
1301 if (move_temp_to_file(curr_pack_name, final_pack_name))
1302 die(_("cannot store pack file"));
1303 } else if (from_stdin)
1304 chmod(final_pack_name, 0444);
1305
1306 if (final_index_name != curr_index_name) {
1307 if (!final_index_name) {
1308 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1309 get_object_directory(), sha1_to_hex(sha1));
1310 final_index_name = name;
1311 }
1312 if (move_temp_to_file(curr_index_name, final_index_name))
1313 die(_("cannot store index file"));
1314 } else
1315 chmod(final_index_name, 0444);
1316
1317 if (!from_stdin) {
1318 printf("%s\n", sha1_to_hex(sha1));
1319 } else {
1320 char buf[48];
1321 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1322 report, sha1_to_hex(sha1));
1323 write_or_die(1, buf, len);
1324
1325 /*
1326 * Let's just mimic git-unpack-objects here and write
1327 * the last part of the input buffer to stdout.
1328 */
1329 while (input_len) {
1330 err = xwrite(1, input_buffer + input_offset, input_len);
1331 if (err <= 0)
1332 break;
1333 input_len -= err;
1334 input_offset += err;
1335 }
1336 }
1337}
1338
1339static int git_index_pack_config(const char *k, const char *v, void *cb)
1340{
1341 struct pack_idx_option *opts = cb;
1342
1343 if (!strcmp(k, "pack.indexversion")) {
1344 opts->version = git_config_int(k, v);
1345 if (opts->version > 2)
1346 die("bad pack.indexversion=%"PRIu32, opts->version);
1347 return 0;
1348 }
1349 if (!strcmp(k, "pack.threads")) {
1350 nr_threads = git_config_int(k, v);
1351 if (nr_threads < 0)
1352 die("invalid number of threads specified (%d)",
1353 nr_threads);
1354#ifdef NO_PTHREADS
1355 if (nr_threads != 1)
1356 warning("no threads support, ignoring %s", k);
1357 nr_threads = 1;
1358#endif
1359 return 0;
1360 }
1361 return git_default_config(k, v, cb);
1362}
1363
1364static int cmp_uint32(const void *a_, const void *b_)
1365{
1366 uint32_t a = *((uint32_t *)a_);
1367 uint32_t b = *((uint32_t *)b_);
1368
1369 return (a < b) ? -1 : (a != b);
1370}
1371
1372static void read_v2_anomalous_offsets(struct packed_git *p,
1373 struct pack_idx_option *opts)
1374{
1375 const uint32_t *idx1, *idx2;
1376 uint32_t i;
1377
1378 /* The address of the 4-byte offset table */
1379 idx1 = (((const uint32_t *)p->index_data)
1380 + 2 /* 8-byte header */
1381 + 256 /* fan out */
1382 + 5 * p->num_objects /* 20-byte SHA-1 table */
1383 + p->num_objects /* CRC32 table */
1384 );
1385
1386 /* The address of the 8-byte offset table */
1387 idx2 = idx1 + p->num_objects;
1388
1389 for (i = 0; i < p->num_objects; i++) {
1390 uint32_t off = ntohl(idx1[i]);
1391 if (!(off & 0x80000000))
1392 continue;
1393 off = off & 0x7fffffff;
1394 if (idx2[off * 2])
1395 continue;
1396 /*
1397 * The real offset is ntohl(idx2[off * 2]) in high 4
1398 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1399 * octets. But idx2[off * 2] is Zero!!!
1400 */
1401 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1402 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1403 }
1404
1405 if (1 < opts->anomaly_nr)
1406 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1407}
1408
1409static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1410{
1411 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1412
1413 if (!p)
1414 die(_("Cannot open existing pack file '%s'"), pack_name);
1415 if (open_pack_index(p))
1416 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1417
1418 /* Read the attributes from the existing idx file */
1419 opts->version = p->index_version;
1420
1421 if (opts->version == 2)
1422 read_v2_anomalous_offsets(p, opts);
1423
1424 /*
1425 * Get rid of the idx file as we do not need it anymore.
1426 * NEEDSWORK: extract this bit from free_pack_by_name() in
1427 * sha1_file.c, perhaps? It shouldn't matter very much as we
1428 * know we haven't installed this pack (hence we never have
1429 * read anything from it).
1430 */
1431 close_pack_index(p);
1432 free(p);
1433}
1434
1435static void show_pack_info(int stat_only)
1436{
1437 int i, baseobjects = nr_objects - nr_deltas;
1438 unsigned long *chain_histogram = NULL;
1439
1440 if (deepest_delta)
1441 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1442
1443 for (i = 0; i < nr_objects; i++) {
1444 struct object_entry *obj = &objects[i];
1445
1446 if (is_delta_type(obj->type))
1447 chain_histogram[obj->delta_depth - 1]++;
1448 if (stat_only)
1449 continue;
1450 printf("%s %-6s %lu %lu %"PRIuMAX,
1451 sha1_to_hex(obj->idx.sha1),
1452 typename(obj->real_type), obj->size,
1453 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1454 (uintmax_t)obj->idx.offset);
1455 if (is_delta_type(obj->type)) {
1456 struct object_entry *bobj = &objects[obj->base_object_no];
1457 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1458 }
1459 putchar('\n');
1460 }
1461
1462 if (baseobjects)
1463 printf_ln(Q_("non delta: %d object",
1464 "non delta: %d objects",
1465 baseobjects),
1466 baseobjects);
1467 for (i = 0; i < deepest_delta; i++) {
1468 if (!chain_histogram[i])
1469 continue;
1470 printf_ln(Q_("chain length = %d: %lu object",
1471 "chain length = %d: %lu objects",
1472 chain_histogram[i]),
1473 i + 1,
1474 chain_histogram[i]);
1475 }
1476}
1477
1478int cmd_index_pack(int argc, const char **argv, const char *prefix)
1479{
1480 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1481 const char *curr_pack, *curr_index;
1482 const char *index_name = NULL, *pack_name = NULL;
1483 const char *keep_name = NULL, *keep_msg = NULL;
1484 char *index_name_buf = NULL, *keep_name_buf = NULL;
1485 struct pack_idx_entry **idx_objects;
1486 struct pack_idx_option opts;
1487 unsigned char pack_sha1[20];
1488
1489 if (argc == 2 && !strcmp(argv[1], "-h"))
1490 usage(index_pack_usage);
1491
1492 read_replace_refs = 0;
1493
1494 reset_pack_idx_option(&opts);
1495 git_config(git_index_pack_config, &opts);
1496 if (prefix && chdir(prefix))
1497 die(_("Cannot come back to cwd"));
1498
1499 for (i = 1; i < argc; i++) {
1500 const char *arg = argv[i];
1501
1502 if (*arg == '-') {
1503 if (!strcmp(arg, "--stdin")) {
1504 from_stdin = 1;
1505 } else if (!strcmp(arg, "--fix-thin")) {
1506 fix_thin_pack = 1;
1507 } else if (!strcmp(arg, "--strict")) {
1508 strict = 1;
1509 } else if (!strcmp(arg, "--verify")) {
1510 verify = 1;
1511 } else if (!strcmp(arg, "--verify-stat")) {
1512 verify = 1;
1513 show_stat = 1;
1514 } else if (!strcmp(arg, "--verify-stat-only")) {
1515 verify = 1;
1516 show_stat = 1;
1517 stat_only = 1;
1518 } else if (!strcmp(arg, "--keep")) {
1519 keep_msg = "";
1520 } else if (!prefixcmp(arg, "--keep=")) {
1521 keep_msg = arg + 7;
1522 } else if (!prefixcmp(arg, "--threads=")) {
1523 char *end;
1524 nr_threads = strtoul(arg+10, &end, 0);
1525 if (!arg[10] || *end || nr_threads < 0)
1526 usage(index_pack_usage);
1527#ifdef NO_PTHREADS
1528 if (nr_threads != 1)
1529 warning("no threads support, "
1530 "ignoring %s", arg);
1531 nr_threads = 1;
1532#endif
1533 } else if (!prefixcmp(arg, "--pack_header=")) {
1534 struct pack_header *hdr;
1535 char *c;
1536
1537 hdr = (struct pack_header *)input_buffer;
1538 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1539 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1540 if (*c != ',')
1541 die(_("bad %s"), arg);
1542 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1543 if (*c)
1544 die(_("bad %s"), arg);
1545 input_len = sizeof(*hdr);
1546 } else if (!strcmp(arg, "-v")) {
1547 verbose = 1;
1548 } else if (!strcmp(arg, "-o")) {
1549 if (index_name || (i+1) >= argc)
1550 usage(index_pack_usage);
1551 index_name = argv[++i];
1552 } else if (!prefixcmp(arg, "--index-version=")) {
1553 char *c;
1554 opts.version = strtoul(arg + 16, &c, 10);
1555 if (opts.version > 2)
1556 die(_("bad %s"), arg);
1557 if (*c == ',')
1558 opts.off32_limit = strtoul(c+1, &c, 0);
1559 if (*c || opts.off32_limit & 0x80000000)
1560 die(_("bad %s"), arg);
1561 } else
1562 usage(index_pack_usage);
1563 continue;
1564 }
1565
1566 if (pack_name)
1567 usage(index_pack_usage);
1568 pack_name = arg;
1569 }
1570
1571 if (!pack_name && !from_stdin)
1572 usage(index_pack_usage);
1573 if (fix_thin_pack && !from_stdin)
1574 die(_("--fix-thin cannot be used without --stdin"));
1575 if (!index_name && pack_name) {
1576 int len = strlen(pack_name);
1577 if (!has_extension(pack_name, ".pack"))
1578 die(_("packfile name '%s' does not end with '.pack'"),
1579 pack_name);
1580 index_name_buf = xmalloc(len);
1581 memcpy(index_name_buf, pack_name, len - 5);
1582 strcpy(index_name_buf + len - 5, ".idx");
1583 index_name = index_name_buf;
1584 }
1585 if (keep_msg && !keep_name && pack_name) {
1586 int len = strlen(pack_name);
1587 if (!has_extension(pack_name, ".pack"))
1588 die(_("packfile name '%s' does not end with '.pack'"),
1589 pack_name);
1590 keep_name_buf = xmalloc(len);
1591 memcpy(keep_name_buf, pack_name, len - 5);
1592 strcpy(keep_name_buf + len - 5, ".keep");
1593 keep_name = keep_name_buf;
1594 }
1595 if (verify) {
1596 if (!index_name)
1597 die(_("--verify with no packfile name given"));
1598 read_idx_option(&opts, index_name);
1599 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1600 }
1601 if (strict)
1602 opts.flags |= WRITE_IDX_STRICT;
1603
1604#ifndef NO_PTHREADS
1605 if (!nr_threads) {
1606 nr_threads = online_cpus();
1607 /* An experiment showed that more threads does not mean faster */
1608 if (nr_threads > 3)
1609 nr_threads = 3;
1610 }
1611#endif
1612
1613 curr_pack = open_pack_file(pack_name);
1614 parse_pack_header();
1615 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1616 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1617 parse_pack_objects(pack_sha1);
1618 resolve_deltas();
1619 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1620 free(deltas);
1621 if (strict)
1622 check_objects();
1623
1624 if (show_stat)
1625 show_pack_info(stat_only);
1626
1627 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1628 for (i = 0; i < nr_objects; i++)
1629 idx_objects[i] = &objects[i].idx;
1630 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1631 free(idx_objects);
1632
1633 if (!verify)
1634 final(pack_name, curr_pack,
1635 index_name, curr_index,
1636 keep_name, keep_msg,
1637 pack_sha1);
1638 else
1639 close(input_fd);
1640 free(objects);
1641 free(index_name_buf);
1642 free(keep_name_buf);
1643 if (pack_name == NULL)
1644 free((void *) curr_pack);
1645 if (index_name == NULL)
1646 free((void *) curr_index);
1647
1648 return 0;
1649}