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};
42struct thread_local {
44#ifndef NO_PTHREADS
45 pthread_t thread;
46#endif
47 struct base_data *base_cache;
48 size_t base_cache_used;
49 int pack_fd;
50};
51/*
53 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
54 * to memcmp() only the first 20 bytes.
55 */
56#define UNION_BASE_SZ 20
57#define FLAG_LINK (1u<<20)
59#define FLAG_CHECKED (1u<<21)
60struct delta_entry {
62 union delta_base base;
63 int obj_no;
64};
65static struct object_entry *objects;
67static struct delta_entry *deltas;
68static struct thread_local nothread_data;
69static int nr_objects;
70static int nr_deltas;
71static int nr_resolved_deltas;
72static int nr_threads;
73static int from_stdin;
75static int strict;
76static int do_fsck_object;
77static int verbose;
78static int show_stat;
79static int check_self_contained_and_connected;
80static struct progress *progress;
82/* We always read in 4kB chunks. */
84static unsigned char input_buffer[4096];
85static unsigned int input_offset, input_len;
86static off_t consumed_bytes;
87static unsigned deepest_delta;
88static git_SHA_CTX input_ctx;
89static uint32_t input_crc32;
90static int input_fd, output_fd;
91static const char *curr_pack;
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_mutex_t deepest_delta_mutex;
112#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
113#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
114static pthread_mutex_t type_cas_mutex;
116#define type_cas_lock() lock_mutex(&type_cas_mutex)
117#define type_cas_unlock() unlock_mutex(&type_cas_mutex)
118static pthread_key_t key;
120static inline void lock_mutex(pthread_mutex_t *mutex)
122{
123 if (threads_active)
124 pthread_mutex_lock(mutex);
125}
126static inline void unlock_mutex(pthread_mutex_t *mutex)
128{
129 if (threads_active)
130 pthread_mutex_unlock(mutex);
131}
132/*
134 * Mutex and conditional variable can't be statically-initialized on Windows.
135 */
136static void init_thread(void)
137{
138 int i;
139 init_recursive_mutex(&read_mutex);
140 pthread_mutex_init(&counter_mutex, NULL);
141 pthread_mutex_init(&work_mutex, NULL);
142 pthread_mutex_init(&type_cas_mutex, NULL);
143 if (show_stat)
144 pthread_mutex_init(&deepest_delta_mutex, NULL);
145 pthread_key_create(&key, NULL);
146 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
147 for (i = 0; i < nr_threads; i++) {
148 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
149 if (thread_data[i].pack_fd == -1)
150 die_errno(_("unable to open %s"), curr_pack);
151 }
152 threads_active = 1;
154}
155static void cleanup_thread(void)
157{
158 int i;
159 if (!threads_active)
160 return;
161 threads_active = 0;
162 pthread_mutex_destroy(&read_mutex);
163 pthread_mutex_destroy(&counter_mutex);
164 pthread_mutex_destroy(&work_mutex);
165 pthread_mutex_destroy(&type_cas_mutex);
166 if (show_stat)
167 pthread_mutex_destroy(&deepest_delta_mutex);
168 for (i = 0; i < nr_threads; i++)
169 close(thread_data[i].pack_fd);
170 pthread_key_delete(key);
171 free(thread_data);
172}
173#else
175#define read_lock()
177#define read_unlock()
178#define counter_lock()
180#define counter_unlock()
181#define work_lock()
183#define work_unlock()
184#define deepest_delta_lock()
186#define deepest_delta_unlock()
187#endif
189static int mark_link(struct object *obj, int type, void *data)
192{
193 if (!obj)
194 return -1;
195 if (type != OBJ_ANY && obj->type != type)
197 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
198 obj->flags |= FLAG_LINK;
200 return 0;
201}
202/* The content of each linked object must have been checked
204 or it must be already present in the object database */
205static unsigned check_object(struct object *obj)
206{
207 if (!obj)
208 return 0;
209 if (!(obj->flags & FLAG_LINK))
211 return 0;
212 if (!(obj->flags & FLAG_CHECKED)) {
214 unsigned long size;
215 int type = sha1_object_info(obj->sha1, &size);
216 if (type <= 0)
217 die(_("did not receive expected object %s"),
218 sha1_to_hex(obj->sha1));
219 if (type != obj->type)
220 die(_("object %s: expected type %s, found %s"),
221 sha1_to_hex(obj->sha1),
222 typename(obj->type), typename(type));
223 obj->flags |= FLAG_CHECKED;
224 return 1;
225 }
226 return 0;
228}
229static unsigned check_objects(void)
231{
232 unsigned i, max, foreign_nr = 0;
233 max = get_max_object_index();
235 for (i = 0; i < max; i++)
236 foreign_nr += check_object(get_indexed_object(i));
237 return foreign_nr;
238}
239/* Discard current buffer used content. */
242static void flush(void)
243{
244 if (input_offset) {
245 if (output_fd >= 0)
246 write_or_die(output_fd, input_buffer, input_offset);
247 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
248 memmove(input_buffer, input_buffer + input_offset, input_len);
249 input_offset = 0;
250 }
251}
252/*
254 * Make sure at least "min" bytes are available in the buffer, and
255 * return the pointer to the buffer.
256 */
257static void *fill(int min)
258{
259 if (min <= input_len)
260 return input_buffer + input_offset;
261 if (min > sizeof(input_buffer))
262 die(Q_("cannot fill %d byte",
263 "cannot fill %d bytes",
264 min),
265 min);
266 flush();
267 do {
268 ssize_t ret = xread(input_fd, input_buffer + input_len,
269 sizeof(input_buffer) - input_len);
270 if (ret <= 0) {
271 if (!ret)
272 die(_("early EOF"));
273 die_errno(_("read error on input"));
274 }
275 input_len += ret;
276 if (from_stdin)
277 display_throughput(progress, consumed_bytes + input_len);
278 } while (input_len < min);
279 return input_buffer;
280}
281static void use(int bytes)
283{
284 if (bytes > input_len)
285 die(_("used more bytes than were available"));
286 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
287 input_len -= bytes;
288 input_offset += bytes;
289 /* make sure off_t is sufficiently large not to wrap */
291 if (signed_add_overflows(consumed_bytes, bytes))
292 die(_("pack too large for current definition of off_t"));
293 consumed_bytes += bytes;
294}
295static const char *open_pack_file(const char *pack_name)
297{
298 if (from_stdin) {
299 input_fd = 0;
300 if (!pack_name) {
301 static char tmp_file[PATH_MAX];
302 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
303 "pack/tmp_pack_XXXXXX");
304 pack_name = xstrdup(tmp_file);
305 } else
306 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
307 if (output_fd < 0)
308 die_errno(_("unable to create '%s'"), pack_name);
309 nothread_data.pack_fd = output_fd;
310 } else {
311 input_fd = open(pack_name, O_RDONLY);
312 if (input_fd < 0)
313 die_errno(_("cannot open packfile '%s'"), pack_name);
314 output_fd = -1;
315 nothread_data.pack_fd = input_fd;
316 }
317 git_SHA1_Init(&input_ctx);
318 return pack_name;
319}
320static void parse_pack_header(void)
322{
323 struct pack_header *hdr = fill(sizeof(struct pack_header));
324 /* Header consistency check */
326 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
327 die(_("pack signature mismatch"));
328 if (!pack_version_ok(hdr->hdr_version))
329 die(_("pack version %"PRIu32" unsupported"),
330 ntohl(hdr->hdr_version));
331 nr_objects = ntohl(hdr->hdr_entries);
333 use(sizeof(struct pack_header));
334}
335static NORETURN void bad_object(unsigned long offset, const char *format,
337 ...) __attribute__((format (printf, 2, 3)));
338static NORETURN void bad_object(unsigned long offset, const char *format, ...)
340{
341 va_list params;
342 char buf[1024];
343 va_start(params, format);
345 vsnprintf(buf, sizeof(buf), format, params);
346 va_end(params);
347 die(_("pack has bad object at offset %lu: %s"), offset, buf);
348}
349static inline struct thread_local *get_thread_data(void)
351{
352#ifndef NO_PTHREADS
353 if (threads_active)
354 return pthread_getspecific(key);
355 assert(!threads_active &&
356 "This should only be reached when all threads are gone");
357#endif
358 return ¬hread_data;
359}
360#ifndef NO_PTHREADS
362static void set_thread_data(struct thread_local *data)
363{
364 if (threads_active)
365 pthread_setspecific(key, data);
366}
367#endif
368static struct base_data *alloc_base_data(void)
370{
371 struct base_data *base = xcalloc(1, sizeof(struct base_data));
372 base->ref_last = -1;
373 base->ofs_last = -1;
374 return base;
375}
376static void free_base_data(struct base_data *c)
378{
379 if (c->data) {
380 free(c->data);
381 c->data = NULL;
382 get_thread_data()->base_cache_used -= c->size;
383 }
384}
385static void prune_base_data(struct base_data *retain)
387{
388 struct base_data *b;
389 struct thread_local *data = get_thread_data();
390 for (b = data->base_cache;
391 data->base_cache_used > delta_base_cache_limit && b;
392 b = b->child) {
393 if (b->data && b != retain)
394 free_base_data(b);
395 }
396}
397static void link_base_data(struct base_data *base, struct base_data *c)
399{
400 if (base)
401 base->child = c;
402 else
403 get_thread_data()->base_cache = c;
404 c->base = base;
406 c->child = NULL;
407 if (c->data)
408 get_thread_data()->base_cache_used += c->size;
409 prune_base_data(c);
410}
411static void unlink_base_data(struct base_data *c)
413{
414 struct base_data *base = c->base;
415 if (base)
416 base->child = NULL;
417 else
418 get_thread_data()->base_cache = NULL;
419 free_base_data(c);
420}
421static int is_delta_type(enum object_type type)
423{
424 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
425}
426static void *unpack_entry_data(unsigned long offset, unsigned long size,
428 enum object_type type, unsigned char *sha1)
429{
430 static char fixed_buf[8192];
431 int status;
432 git_zstream stream;
433 void *buf;
434 git_SHA_CTX c;
435 char hdr[32];
436 int hdrlen;
437 if (!is_delta_type(type)) {
439 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
440 git_SHA1_Init(&c);
441 git_SHA1_Update(&c, hdr, hdrlen);
442 } else
443 sha1 = NULL;
444 if (type == OBJ_BLOB && size > big_file_threshold)
445 buf = fixed_buf;
446 else
447 buf = xmalloc(size);
448 memset(&stream, 0, sizeof(stream));
450 git_inflate_init(&stream);
451 stream.next_out = buf;
452 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
453 do {
455 unsigned char *last_out = stream.next_out;
456 stream.next_in = fill(1);
457 stream.avail_in = input_len;
458 status = git_inflate(&stream, 0);
459 use(input_len - stream.avail_in);
460 if (sha1)
461 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
462 if (buf == fixed_buf) {
463 stream.next_out = buf;
464 stream.avail_out = sizeof(fixed_buf);
465 }
466 } while (status == Z_OK);
467 if (stream.total_out != size || status != Z_STREAM_END)
468 bad_object(offset, _("inflate returned %d"), status);
469 git_inflate_end(&stream);
470 if (sha1)
471 git_SHA1_Final(sha1, &c);
472 return buf == fixed_buf ? NULL : buf;
473}
474static void *unpack_raw_entry(struct object_entry *obj,
476 union delta_base *delta_base,
477 unsigned char *sha1)
478{
479 unsigned char *p;
480 unsigned long size, c;
481 off_t base_offset;
482 unsigned shift;
483 void *data;
484 obj->idx.offset = consumed_bytes;
486 input_crc32 = crc32(0, NULL, 0);
487 p = fill(1);
489 c = *p;
490 use(1);
491 obj->type = (c >> 4) & 7;
492 size = (c & 15);
493 shift = 4;
494 while (c & 0x80) {
495 p = fill(1);
496 c = *p;
497 use(1);
498 size += (c & 0x7f) << shift;
499 shift += 7;
500 }
501 obj->size = size;
502 switch (obj->type) {
504 case OBJ_REF_DELTA:
505 hashcpy(delta_base->sha1, fill(20));
506 use(20);
507 break;
508 case OBJ_OFS_DELTA:
509 memset(delta_base, 0, sizeof(*delta_base));
510 p = fill(1);
511 c = *p;
512 use(1);
513 base_offset = c & 127;
514 while (c & 128) {
515 base_offset += 1;
516 if (!base_offset || MSB(base_offset, 7))
517 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
518 p = fill(1);
519 c = *p;
520 use(1);
521 base_offset = (base_offset << 7) + (c & 127);
522 }
523 delta_base->offset = obj->idx.offset - base_offset;
524 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
525 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
526 break;
527 case OBJ_COMMIT:
528 case OBJ_TREE:
529 case OBJ_BLOB:
530 case OBJ_TAG:
531 break;
532 default:
533 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
534 }
535 obj->hdr_size = consumed_bytes - obj->idx.offset;
536 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
538 obj->idx.crc32 = input_crc32;
539 return data;
540}
541static void *unpack_data(struct object_entry *obj,
543 int (*consume)(const unsigned char *, unsigned long, void *),
544 void *cb_data)
545{
546 off_t from = obj[0].idx.offset + obj[0].hdr_size;
547 unsigned long len = obj[1].idx.offset - from;
548 unsigned char *data, *inbuf;
549 git_zstream stream;
550 int status;
551 data = xmalloc(consume ? 64*1024 : obj->size);
553 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
554 memset(&stream, 0, sizeof(stream));
556 git_inflate_init(&stream);
557 stream.next_out = data;
558 stream.avail_out = consume ? 64*1024 : obj->size;
559 do {
561 ssize_t n = (len < 64*1024) ? len : 64*1024;
562 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
563 if (n < 0)
564 die_errno(_("cannot pread pack file"));
565 if (!n)
566 die(Q_("premature end of pack file, %lu byte missing",
567 "premature end of pack file, %lu bytes missing",
568 len),
569 len);
570 from += n;
571 len -= n;
572 stream.next_in = inbuf;
573 stream.avail_in = n;
574 if (!consume)
575 status = git_inflate(&stream, 0);
576 else {
577 do {
578 status = git_inflate(&stream, 0);
579 if (consume(data, stream.next_out - data, cb_data)) {
580 free(inbuf);
581 free(data);
582 return NULL;
583 }
584 stream.next_out = data;
585 stream.avail_out = 64*1024;
586 } while (status == Z_OK && stream.avail_in);
587 }
588 } while (len && status == Z_OK && !stream.avail_in);
589 /* This has been inflated OK when first encountered, so... */
591 if (status != Z_STREAM_END || stream.total_out != obj->size)
592 die(_("serious inflate inconsistency"));
593 git_inflate_end(&stream);
595 free(inbuf);
596 if (consume) {
597 free(data);
598 data = NULL;
599 }
600 return data;
601}
602static void *get_data_from_pack(struct object_entry *obj)
604{
605 return unpack_data(obj, NULL, NULL);
606}
607static int compare_delta_bases(const union delta_base *base1,
609 const union delta_base *base2,
610 enum object_type type1,
611 enum object_type type2)
612{
613 int cmp = type1 - type2;
614 if (cmp)
615 return cmp;
616 return memcmp(base1, base2, UNION_BASE_SZ);
617}
618static int find_delta(const union delta_base *base, enum object_type type)
620{
621 int first = 0, last = nr_deltas;
622 while (first < last) {
624 int next = (first + last) / 2;
625 struct delta_entry *delta = &deltas[next];
626 int cmp;
627 cmp = compare_delta_bases(base, &delta->base,
629 type, objects[delta->obj_no].type);
630 if (!cmp)
631 return next;
632 if (cmp < 0) {
633 last = next;
634 continue;
635 }
636 first = next+1;
637 }
638 return -first-1;
639}
640static void find_delta_children(const union delta_base *base,
642 int *first_index, int *last_index,
643 enum object_type type)
644{
645 int first = find_delta(base, type);
646 int last = first;
647 int end = nr_deltas - 1;
648 if (first < 0) {
650 *first_index = 0;
651 *last_index = -1;
652 return;
653 }
654 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
655 --first;
656 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
657 ++last;
658 *first_index = first;
659 *last_index = last;
660}
661struct compare_data {
663 struct object_entry *entry;
664 struct git_istream *st;
665 unsigned char *buf;
666 unsigned long buf_size;
667};
668static int compare_objects(const unsigned char *buf, unsigned long size,
670 void *cb_data)
671{
672 struct compare_data *data = cb_data;
673 if (data->buf_size < size) {
675 free(data->buf);
676 data->buf = xmalloc(size);
677 data->buf_size = size;
678 }
679 while (size) {
681 ssize_t len = read_istream(data->st, data->buf, size);
682 if (len == 0)
683 die(_("SHA1 COLLISION FOUND WITH %s !"),
684 sha1_to_hex(data->entry->idx.sha1));
685 if (len < 0)
686 die(_("unable to read %s"),
687 sha1_to_hex(data->entry->idx.sha1));
688 if (memcmp(buf, data->buf, len))
689 die(_("SHA1 COLLISION FOUND WITH %s !"),
690 sha1_to_hex(data->entry->idx.sha1));
691 size -= len;
692 buf += len;
693 }
694 return 0;
695}
696static int check_collison(struct object_entry *entry)
698{
699 struct compare_data data;
700 enum object_type type;
701 unsigned long size;
702 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
704 return -1;
705 memset(&data, 0, sizeof(data));
707 data.entry = entry;
708 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
709 if (!data.st)
710 return -1;
711 if (size != entry->size || type != entry->type)
712 die(_("SHA1 COLLISION FOUND WITH %s !"),
713 sha1_to_hex(entry->idx.sha1));
714 unpack_data(entry, compare_objects, &data);
715 close_istream(data.st);
716 free(data.buf);
717 return 0;
718}
719static void sha1_object(const void *data, struct object_entry *obj_entry,
721 unsigned long size, enum object_type type,
722 const unsigned char *sha1)
723{
724 void *new_data = NULL;
725 int collision_test_needed;
726 assert(data || obj_entry);
728 read_lock();
730 collision_test_needed = has_sha1_file(sha1);
731 read_unlock();
732 if (collision_test_needed && !data) {
734 read_lock();
735 if (!check_collison(obj_entry))
736 collision_test_needed = 0;
737 read_unlock();
738 }
739 if (collision_test_needed) {
740 void *has_data;
741 enum object_type has_type;
742 unsigned long has_size;
743 read_lock();
744 has_type = sha1_object_info(sha1, &has_size);
745 if (has_type != type || has_size != size)
746 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
747 has_data = read_sha1_file(sha1, &has_type, &has_size);
748 read_unlock();
749 if (!data)
750 data = new_data = get_data_from_pack(obj_entry);
751 if (!has_data)
752 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
753 if (size != has_size || type != has_type ||
754 memcmp(data, has_data, size) != 0)
755 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
756 free(has_data);
757 }
758 if (strict) {
760 read_lock();
761 if (type == OBJ_BLOB) {
762 struct blob *blob = lookup_blob(sha1);
763 if (blob)
764 blob->object.flags |= FLAG_CHECKED;
765 else
766 die(_("invalid blob object %s"), sha1_to_hex(sha1));
767 } else {
768 struct object *obj;
769 int eaten;
770 void *buf = (void *) data;
771 assert(data && "data can only be NULL for large _blobs_");
773 /*
775 * we do not need to free the memory here, as the
776 * buf is deleted by the caller.
777 */
778 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
779 if (!obj)
780 die(_("invalid %s"), typename(type));
781 if (do_fsck_object &&
782 fsck_object(obj, 1, fsck_error_function))
783 die(_("Error in object"));
784 if (fsck_walk(obj, mark_link, NULL))
785 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
786 if (obj->type == OBJ_TREE) {
788 struct tree *item = (struct tree *) obj;
789 item->buffer = NULL;
790 obj->parsed = 0;
791 }
792 if (obj->type == OBJ_COMMIT) {
793 struct commit *commit = (struct commit *) obj;
794 if (detach_commit_buffer(commit, NULL) != data)
795 die("BUG: parse_object_buffer transmogrified our buffer");
796 }
797 obj->flags |= FLAG_CHECKED;
798 }
799 read_unlock();
800 }
801 free(new_data);
803}
804/*
806 * This function is part of find_unresolved_deltas(). There are two
807 * walkers going in the opposite ways.
808 *
809 * The first one in find_unresolved_deltas() traverses down from
810 * parent node to children, deflating nodes along the way. However,
811 * memory for deflated nodes is limited by delta_base_cache_limit, so
812 * at some point parent node's deflated content may be freed.
813 *
814 * The second walker is this function, which goes from current node up
815 * to top parent if necessary to deflate the node. In normal
816 * situation, its parent node would be already deflated, so it just
817 * needs to apply delta.
818 *
819 * In the worst case scenario, parent node is no longer deflated because
820 * we're running out of delta_base_cache_limit; we need to re-deflate
821 * parents, possibly up to the top base.
822 *
823 * All deflated objects here are subject to be freed if we exceed
824 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
825 * just need to make sure the last node is not freed.
826 */
827static void *get_base_data(struct base_data *c)
828{
829 if (!c->data) {
830 struct object_entry *obj = c->obj;
831 struct base_data **delta = NULL;
832 int delta_nr = 0, delta_alloc = 0;
833 while (is_delta_type(c->obj->type) && !c->data) {
835 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
836 delta[delta_nr++] = c;
837 c = c->base;
838 }
839 if (!delta_nr) {
840 c->data = get_data_from_pack(obj);
841 c->size = obj->size;
842 get_thread_data()->base_cache_used += c->size;
843 prune_base_data(c);
844 }
845 for (; delta_nr > 0; delta_nr--) {
846 void *base, *raw;
847 c = delta[delta_nr - 1];
848 obj = c->obj;
849 base = get_base_data(c->base);
850 raw = get_data_from_pack(obj);
851 c->data = patch_delta(
852 base, c->base->size,
853 raw, obj->size,
854 &c->size);
855 free(raw);
856 if (!c->data)
857 bad_object(obj->idx.offset, _("failed to apply delta"));
858 get_thread_data()->base_cache_used += c->size;
859 prune_base_data(c);
860 }
861 free(delta);
862 }
863 return c->data;
864}
865static void resolve_delta(struct object_entry *delta_obj,
867 struct base_data *base, struct base_data *result)
868{
869 void *base_data, *delta_data;
870 if (show_stat) {
872 delta_obj->delta_depth = base->obj->delta_depth + 1;
873 deepest_delta_lock();
874 if (deepest_delta < delta_obj->delta_depth)
875 deepest_delta = delta_obj->delta_depth;
876 deepest_delta_unlock();
877 }
878 delta_obj->base_object_no = base->obj - objects;
879 delta_data = get_data_from_pack(delta_obj);
880 base_data = get_base_data(base);
881 result->obj = delta_obj;
882 result->data = patch_delta(base_data, base->size,
883 delta_data, delta_obj->size, &result->size);
884 free(delta_data);
885 if (!result->data)
886 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
887 hash_sha1_file(result->data, result->size,
888 typename(delta_obj->real_type), delta_obj->idx.sha1);
889 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
890 delta_obj->idx.sha1);
891 counter_lock();
892 nr_resolved_deltas++;
893 counter_unlock();
894}
895/*
897 * Standard boolean compare-and-swap: atomically check whether "*type" is
898 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
899 * and return false.
900 */
901static int compare_and_swap_type(enum object_type *type,
902 enum object_type want,
903 enum object_type set)
904{
905 enum object_type old;
906 type_cas_lock();
908 old = *type;
909 if (old == want)
910 *type = set;
911 type_cas_unlock();
912 return old == want;
914}
915static struct base_data *find_unresolved_deltas_1(struct base_data *base,
917 struct base_data *prev_base)
918{
919 if (base->ref_last == -1 && base->ofs_last == -1) {
920 union delta_base base_spec;
921 hashcpy(base_spec.sha1, base->obj->idx.sha1);
923 find_delta_children(&base_spec,
924 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
925 memset(&base_spec, 0, sizeof(base_spec));
927 base_spec.offset = base->obj->idx.offset;
928 find_delta_children(&base_spec,
929 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
930 if (base->ref_last == -1 && base->ofs_last == -1) {
932 free(base->data);
933 return NULL;
934 }
935 link_base_data(prev_base, base);
937 }
938 if (base->ref_first <= base->ref_last) {
940 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
941 struct base_data *result = alloc_base_data();
942 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
944 base->obj->real_type))
945 die("BUG: child->real_type != OBJ_REF_DELTA");
946 resolve_delta(child, base, result);
948 if (base->ref_first == base->ref_last && base->ofs_last == -1)
949 free_base_data(base);
950 base->ref_first++;
952 return result;
953 }
954 if (base->ofs_first <= base->ofs_last) {
956 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
957 struct base_data *result = alloc_base_data();
958 assert(child->real_type == OBJ_OFS_DELTA);
960 child->real_type = base->obj->real_type;
961 resolve_delta(child, base, result);
962 if (base->ofs_first == base->ofs_last)
963 free_base_data(base);
964 base->ofs_first++;
966 return result;
967 }
968 unlink_base_data(base);
970 return NULL;
971}
972static void find_unresolved_deltas(struct base_data *base)
974{
975 struct base_data *new_base, *prev_base = NULL;
976 for (;;) {
977 new_base = find_unresolved_deltas_1(base, prev_base);
978 if (new_base) {
980 prev_base = base;
981 base = new_base;
982 } else {
983 free(base);
984 base = prev_base;
985 if (!base)
986 return;
987 prev_base = base->base;
988 }
989 }
990}
991static int compare_delta_entry(const void *a, const void *b)
993{
994 const struct delta_entry *delta_a = a;
995 const struct delta_entry *delta_b = b;
996 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
998 return compare_delta_bases(&delta_a->base, &delta_b->base,
999 objects[delta_a->obj_no].type,
1000 objects[delta_b->obj_no].type);
1001}
1002static void resolve_base(struct object_entry *obj)
1004{
1005 struct base_data *base_obj = alloc_base_data();
1006 base_obj->obj = obj;
1007 base_obj->data = NULL;
1008 find_unresolved_deltas(base_obj);
1009}
1010#ifndef NO_PTHREADS
1012static void *threaded_second_pass(void *data)
1013{
1014 set_thread_data(data);
1015 for (;;) {
1016 int i;
1017 counter_lock();
1018 display_progress(progress, nr_resolved_deltas);
1019 counter_unlock();
1020 work_lock();
1021 while (nr_dispatched < nr_objects &&
1022 is_delta_type(objects[nr_dispatched].type))
1023 nr_dispatched++;
1024 if (nr_dispatched >= nr_objects) {
1025 work_unlock();
1026 break;
1027 }
1028 i = nr_dispatched++;
1029 work_unlock();
1030 resolve_base(&objects[i]);
1032 }
1033 return NULL;
1034}
1035#endif
1036/*
1038 * First pass:
1039 * - find locations of all objects;
1040 * - calculate SHA1 of all non-delta objects;
1041 * - remember base (SHA1 or offset) for all deltas.
1042 */
1043static void parse_pack_objects(unsigned char *sha1)
1044{
1045 int i, nr_delays = 0;
1046 struct delta_entry *delta = deltas;
1047 struct stat st;
1048 if (verbose)
1050 progress = start_progress(
1051 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1052 nr_objects);
1053 for (i = 0; i < nr_objects; i++) {
1054 struct object_entry *obj = &objects[i];
1055 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
1056 obj->real_type = obj->type;
1057 if (is_delta_type(obj->type)) {
1058 nr_deltas++;
1059 delta->obj_no = i;
1060 delta++;
1061 } else if (!data) {
1062 /* large blobs, check later */
1063 obj->real_type = OBJ_BAD;
1064 nr_delays++;
1065 } else
1066 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1067 free(data);
1068 display_progress(progress, i+1);
1069 }
1070 objects[i].idx.offset = consumed_bytes;
1071 stop_progress(&progress);
1072 /* Check pack integrity */
1074 flush();
1075 git_SHA1_Final(sha1, &input_ctx);
1076 if (hashcmp(fill(20), sha1))
1077 die(_("pack is corrupted (SHA1 mismatch)"));
1078 use(20);
1079 /* If input_fd is a file, we should have reached its end now. */
1081 if (fstat(input_fd, &st))
1082 die_errno(_("cannot fstat packfile"));
1083 if (S_ISREG(st.st_mode) &&
1084 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1085 die(_("pack has junk at the end"));
1086 for (i = 0; i < nr_objects; i++) {
1088 struct object_entry *obj = &objects[i];
1089 if (obj->real_type != OBJ_BAD)
1090 continue;
1091 obj->real_type = obj->type;
1092 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1093 nr_delays--;
1094 }
1095 if (nr_delays)
1096 die(_("confusion beyond insanity in parse_pack_objects()"));
1097}
1098/*
1100 * Second pass:
1101 * - for all non-delta objects, look if it is used as a base for
1102 * deltas;
1103 * - if used as a base, uncompress the object and apply all deltas,
1104 * recursively checking if the resulting object is used as a base
1105 * for some more deltas.
1106 */
1107static void resolve_deltas(void)
1108{
1109 int i;
1110 if (!nr_deltas)
1112 return;
1113 /* Sort deltas by base SHA1/offset for fast searching */
1115 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1116 compare_delta_entry);
1117 if (verbose)
1119 progress = start_progress(_("Resolving deltas"), nr_deltas);
1120#ifndef NO_PTHREADS
1122 nr_dispatched = 0;
1123 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1124 init_thread();
1125 for (i = 0; i < nr_threads; i++) {
1126 int ret = pthread_create(&thread_data[i].thread, NULL,
1127 threaded_second_pass, thread_data + i);
1128 if (ret)
1129 die(_("unable to create thread: %s"),
1130 strerror(ret));
1131 }
1132 for (i = 0; i < nr_threads; i++)
1133 pthread_join(thread_data[i].thread, NULL);
1134 cleanup_thread();
1135 return;
1136 }
1137#endif
1138 for (i = 0; i < nr_objects; i++) {
1140 struct object_entry *obj = &objects[i];
1141 if (is_delta_type(obj->type))
1143 continue;
1144 resolve_base(obj);
1145 display_progress(progress, nr_resolved_deltas);
1146 }
1147}
1148/*
1150 * Third pass:
1151 * - append objects to convert thin pack to full pack if required
1152 * - write the final 20-byte SHA-1
1153 */
1154static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1155static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1156{
1157 if (nr_deltas == nr_resolved_deltas) {
1158 stop_progress(&progress);
1159 /* Flush remaining pack final 20-byte SHA1. */
1160 flush();
1161 return;
1162 }
1163 if (fix_thin_pack) {
1165 struct sha1file *f;
1166 unsigned char read_sha1[20], tail_sha1[20];
1167 struct strbuf msg = STRBUF_INIT;
1168 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1169 int nr_objects_initial = nr_objects;
1170 if (nr_unresolved <= 0)
1171 die(_("confusion beyond insanity"));
1172 objects = xrealloc(objects,
1173 (nr_objects + nr_unresolved + 1)
1174 * sizeof(*objects));
1175 memset(objects + nr_objects + 1, 0,
1176 nr_unresolved * sizeof(*objects));
1177 f = sha1fd(output_fd, curr_pack);
1178 fix_unresolved_deltas(f, nr_unresolved);
1179 strbuf_addf(&msg, _("completed with %d local objects"),
1180 nr_objects - nr_objects_initial);
1181 stop_progress_msg(&progress, msg.buf);
1182 strbuf_release(&msg);
1183 sha1close(f, tail_sha1, 0);
1184 hashcpy(read_sha1, pack_sha1);
1185 fixup_pack_header_footer(output_fd, pack_sha1,
1186 curr_pack, nr_objects,
1187 read_sha1, consumed_bytes-20);
1188 if (hashcmp(read_sha1, tail_sha1) != 0)
1189 die(_("Unexpected tail checksum for %s "
1190 "(disk corruption?)"), curr_pack);
1191 }
1192 if (nr_deltas != nr_resolved_deltas)
1193 die(Q_("pack has %d unresolved delta",
1194 "pack has %d unresolved deltas",
1195 nr_deltas - nr_resolved_deltas),
1196 nr_deltas - nr_resolved_deltas);
1197}
1198static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1200{
1201 git_zstream stream;
1202 int status;
1203 unsigned char outbuf[4096];
1204 memset(&stream, 0, sizeof(stream));
1206 git_deflate_init(&stream, zlib_compression_level);
1207 stream.next_in = in;
1208 stream.avail_in = size;
1209 do {
1211 stream.next_out = outbuf;
1212 stream.avail_out = sizeof(outbuf);
1213 status = git_deflate(&stream, Z_FINISH);
1214 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1215 } while (status == Z_OK);
1216 if (status != Z_STREAM_END)
1218 die(_("unable to deflate appended object (%d)"), status);
1219 size = stream.total_out;
1220 git_deflate_end(&stream);
1221 return size;
1222}
1223static struct object_entry *append_obj_to_pack(struct sha1file *f,
1225 const unsigned char *sha1, void *buf,
1226 unsigned long size, enum object_type type)
1227{
1228 struct object_entry *obj = &objects[nr_objects++];
1229 unsigned char header[10];
1230 unsigned long s = size;
1231 int n = 0;
1232 unsigned char c = (type << 4) | (s & 15);
1233 s >>= 4;
1234 while (s) {
1235 header[n++] = c | 0x80;
1236 c = s & 0x7f;
1237 s >>= 7;
1238 }
1239 header[n++] = c;
1240 crc32_begin(f);
1241 sha1write(f, header, n);
1242 obj[0].size = size;
1243 obj[0].hdr_size = n;
1244 obj[0].type = type;
1245 obj[0].real_type = type;
1246 obj[1].idx.offset = obj[0].idx.offset + n;
1247 obj[1].idx.offset += write_compressed(f, buf, size);
1248 obj[0].idx.crc32 = crc32_end(f);
1249 sha1flush(f);
1250 hashcpy(obj->idx.sha1, sha1);
1251 return obj;
1252}
1253static int delta_pos_compare(const void *_a, const void *_b)
1255{
1256 struct delta_entry *a = *(struct delta_entry **)_a;
1257 struct delta_entry *b = *(struct delta_entry **)_b;
1258 return a->obj_no - b->obj_no;
1259}
1260static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1262{
1263 struct delta_entry **sorted_by_pos;
1264 int i, n = 0;
1265 /*
1267 * Since many unresolved deltas may well be themselves base objects
1268 * for more unresolved deltas, we really want to include the
1269 * smallest number of base objects that would cover as much delta
1270 * as possible by picking the
1271 * trunc deltas first, allowing for other deltas to resolve without
1272 * additional base objects. Since most base objects are to be found
1273 * before deltas depending on them, a good heuristic is to start
1274 * resolving deltas in the same order as their position in the pack.
1275 */
1276 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1277 for (i = 0; i < nr_deltas; i++) {
1278 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1279 continue;
1280 sorted_by_pos[n++] = &deltas[i];
1281 }
1282 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1283 for (i = 0; i < n; i++) {
1285 struct delta_entry *d = sorted_by_pos[i];
1286 enum object_type type;
1287 struct base_data *base_obj = alloc_base_data();
1288 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1290 continue;
1291 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1292 if (!base_obj->data)
1293 continue;
1294 if (check_sha1_signature(d->base.sha1, base_obj->data,
1296 base_obj->size, typename(type)))
1297 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1298 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1299 base_obj->data, base_obj->size, type);
1300 find_unresolved_deltas(base_obj);
1301 display_progress(progress, nr_resolved_deltas);
1302 }
1303 free(sorted_by_pos);
1304}
1305static void final(const char *final_pack_name, const char *curr_pack_name,
1307 const char *final_index_name, const char *curr_index_name,
1308 const char *keep_name, const char *keep_msg,
1309 unsigned char *sha1)
1310{
1311 const char *report = "pack";
1312 char name[PATH_MAX];
1313 int err;
1314 if (!from_stdin) {
1316 close(input_fd);
1317 } else {
1318 fsync_or_die(output_fd, curr_pack_name);
1319 err = close(output_fd);
1320 if (err)
1321 die_errno(_("error while closing pack file"));
1322 }
1323 if (keep_msg) {
1325 int keep_fd, keep_msg_len = strlen(keep_msg);
1326 if (!keep_name)
1328 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1329 else
1330 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1331 if (keep_fd < 0) {
1333 if (errno != EEXIST)
1334 die_errno(_("cannot write keep file '%s'"),
1335 keep_name ? keep_name : name);
1336 } else {
1337 if (keep_msg_len > 0) {
1338 write_or_die(keep_fd, keep_msg, keep_msg_len);
1339 write_or_die(keep_fd, "\n", 1);
1340 }
1341 if (close(keep_fd) != 0)
1342 die_errno(_("cannot close written keep file '%s'"),
1343 keep_name ? keep_name : name);
1344 report = "keep";
1345 }
1346 }
1347 if (final_pack_name != curr_pack_name) {
1349 if (!final_pack_name) {
1350 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1351 get_object_directory(), sha1_to_hex(sha1));
1352 final_pack_name = name;
1353 }
1354 if (move_temp_to_file(curr_pack_name, final_pack_name))
1355 die(_("cannot store pack file"));
1356 } else if (from_stdin)
1357 chmod(final_pack_name, 0444);
1358 if (final_index_name != curr_index_name) {
1360 if (!final_index_name) {
1361 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1362 get_object_directory(), sha1_to_hex(sha1));
1363 final_index_name = name;
1364 }
1365 if (move_temp_to_file(curr_index_name, final_index_name))
1366 die(_("cannot store index file"));
1367 } else
1368 chmod(final_index_name, 0444);
1369 if (!from_stdin) {
1371 printf("%s\n", sha1_to_hex(sha1));
1372 } else {
1373 char buf[48];
1374 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1375 report, sha1_to_hex(sha1));
1376 write_or_die(1, buf, len);
1377 /*
1379 * Let's just mimic git-unpack-objects here and write
1380 * the last part of the input buffer to stdout.
1381 */
1382 while (input_len) {
1383 err = xwrite(1, input_buffer + input_offset, input_len);
1384 if (err <= 0)
1385 break;
1386 input_len -= err;
1387 input_offset += err;
1388 }
1389 }
1390}
1391static int git_index_pack_config(const char *k, const char *v, void *cb)
1393{
1394 struct pack_idx_option *opts = cb;
1395 if (!strcmp(k, "pack.indexversion")) {
1397 opts->version = git_config_int(k, v);
1398 if (opts->version > 2)
1399 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1400 return 0;
1401 }
1402 if (!strcmp(k, "pack.threads")) {
1403 nr_threads = git_config_int(k, v);
1404 if (nr_threads < 0)
1405 die(_("invalid number of threads specified (%d)"),
1406 nr_threads);
1407#ifdef NO_PTHREADS
1408 if (nr_threads != 1)
1409 warning(_("no threads support, ignoring %s"), k);
1410 nr_threads = 1;
1411#endif
1412 return 0;
1413 }
1414 return git_default_config(k, v, cb);
1415}
1416static int cmp_uint32(const void *a_, const void *b_)
1418{
1419 uint32_t a = *((uint32_t *)a_);
1420 uint32_t b = *((uint32_t *)b_);
1421 return (a < b) ? -1 : (a != b);
1423}
1424static void read_v2_anomalous_offsets(struct packed_git *p,
1426 struct pack_idx_option *opts)
1427{
1428 const uint32_t *idx1, *idx2;
1429 uint32_t i;
1430 /* The address of the 4-byte offset table */
1432 idx1 = (((const uint32_t *)p->index_data)
1433 + 2 /* 8-byte header */
1434 + 256 /* fan out */
1435 + 5 * p->num_objects /* 20-byte SHA-1 table */
1436 + p->num_objects /* CRC32 table */
1437 );
1438 /* The address of the 8-byte offset table */
1440 idx2 = idx1 + p->num_objects;
1441 for (i = 0; i < p->num_objects; i++) {
1443 uint32_t off = ntohl(idx1[i]);
1444 if (!(off & 0x80000000))
1445 continue;
1446 off = off & 0x7fffffff;
1447 if (idx2[off * 2])
1448 continue;
1449 /*
1450 * The real offset is ntohl(idx2[off * 2]) in high 4
1451 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1452 * octets. But idx2[off * 2] is Zero!!!
1453 */
1454 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1455 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1456 }
1457 if (1 < opts->anomaly_nr)
1459 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1460}
1461static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1463{
1464 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1465 if (!p)
1467 die(_("Cannot open existing pack file '%s'"), pack_name);
1468 if (open_pack_index(p))
1469 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1470 /* Read the attributes from the existing idx file */
1472 opts->version = p->index_version;
1473 if (opts->version == 2)
1475 read_v2_anomalous_offsets(p, opts);
1476 /*
1478 * Get rid of the idx file as we do not need it anymore.
1479 * NEEDSWORK: extract this bit from free_pack_by_name() in
1480 * sha1_file.c, perhaps? It shouldn't matter very much as we
1481 * know we haven't installed this pack (hence we never have
1482 * read anything from it).
1483 */
1484 close_pack_index(p);
1485 free(p);
1486}
1487static void show_pack_info(int stat_only)
1489{
1490 int i, baseobjects = nr_objects - nr_deltas;
1491 unsigned long *chain_histogram = NULL;
1492 if (deepest_delta)
1494 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1495 for (i = 0; i < nr_objects; i++) {
1497 struct object_entry *obj = &objects[i];
1498 if (is_delta_type(obj->type))
1500 chain_histogram[obj->delta_depth - 1]++;
1501 if (stat_only)
1502 continue;
1503 printf("%s %-6s %lu %lu %"PRIuMAX,
1504 sha1_to_hex(obj->idx.sha1),
1505 typename(obj->real_type), obj->size,
1506 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1507 (uintmax_t)obj->idx.offset);
1508 if (is_delta_type(obj->type)) {
1509 struct object_entry *bobj = &objects[obj->base_object_no];
1510 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1511 }
1512 putchar('\n');
1513 }
1514 if (baseobjects)
1516 printf_ln(Q_("non delta: %d object",
1517 "non delta: %d objects",
1518 baseobjects),
1519 baseobjects);
1520 for (i = 0; i < deepest_delta; i++) {
1521 if (!chain_histogram[i])
1522 continue;
1523 printf_ln(Q_("chain length = %d: %lu object",
1524 "chain length = %d: %lu objects",
1525 chain_histogram[i]),
1526 i + 1,
1527 chain_histogram[i]);
1528 }
1529}
1530int cmd_index_pack(int argc, const char **argv, const char *prefix)
1532{
1533 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1534 const char *curr_index;
1535 const char *index_name = NULL, *pack_name = NULL;
1536 const char *keep_name = NULL, *keep_msg = NULL;
1537 struct strbuf index_name_buf = STRBUF_INIT,
1538 keep_name_buf = STRBUF_INIT;
1539 struct pack_idx_entry **idx_objects;
1540 struct pack_idx_option opts;
1541 unsigned char pack_sha1[20];
1542 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1543 if (argc == 2 && !strcmp(argv[1], "-h"))
1545 usage(index_pack_usage);
1546 check_replace_refs = 0;
1548 reset_pack_idx_option(&opts);
1550 git_config(git_index_pack_config, &opts);
1551 if (prefix && chdir(prefix))
1552 die(_("Cannot come back to cwd"));
1553 for (i = 1; i < argc; i++) {
1555 const char *arg = argv[i];
1556 if (*arg == '-') {
1558 if (!strcmp(arg, "--stdin")) {
1559 from_stdin = 1;
1560 } else if (!strcmp(arg, "--fix-thin")) {
1561 fix_thin_pack = 1;
1562 } else if (!strcmp(arg, "--strict")) {
1563 strict = 1;
1564 do_fsck_object = 1;
1565 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1566 strict = 1;
1567 check_self_contained_and_connected = 1;
1568 } else if (!strcmp(arg, "--verify")) {
1569 verify = 1;
1570 } else if (!strcmp(arg, "--verify-stat")) {
1571 verify = 1;
1572 show_stat = 1;
1573 } else if (!strcmp(arg, "--verify-stat-only")) {
1574 verify = 1;
1575 show_stat = 1;
1576 stat_only = 1;
1577 } else if (!strcmp(arg, "--keep")) {
1578 keep_msg = "";
1579 } else if (starts_with(arg, "--keep=")) {
1580 keep_msg = arg + 7;
1581 } else if (starts_with(arg, "--threads=")) {
1582 char *end;
1583 nr_threads = strtoul(arg+10, &end, 0);
1584 if (!arg[10] || *end || nr_threads < 0)
1585 usage(index_pack_usage);
1586#ifdef NO_PTHREADS
1587 if (nr_threads != 1)
1588 warning(_("no threads support, "
1589 "ignoring %s"), arg);
1590 nr_threads = 1;
1591#endif
1592 } else if (starts_with(arg, "--pack_header=")) {
1593 struct pack_header *hdr;
1594 char *c;
1595 hdr = (struct pack_header *)input_buffer;
1597 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1598 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1599 if (*c != ',')
1600 die(_("bad %s"), arg);
1601 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1602 if (*c)
1603 die(_("bad %s"), arg);
1604 input_len = sizeof(*hdr);
1605 } else if (!strcmp(arg, "-v")) {
1606 verbose = 1;
1607 } else if (!strcmp(arg, "-o")) {
1608 if (index_name || (i+1) >= argc)
1609 usage(index_pack_usage);
1610 index_name = argv[++i];
1611 } else if (starts_with(arg, "--index-version=")) {
1612 char *c;
1613 opts.version = strtoul(arg + 16, &c, 10);
1614 if (opts.version > 2)
1615 die(_("bad %s"), arg);
1616 if (*c == ',')
1617 opts.off32_limit = strtoul(c+1, &c, 0);
1618 if (*c || opts.off32_limit & 0x80000000)
1619 die(_("bad %s"), arg);
1620 } else
1621 usage(index_pack_usage);
1622 continue;
1623 }
1624 if (pack_name)
1626 usage(index_pack_usage);
1627 pack_name = arg;
1628 }
1629 if (!pack_name && !from_stdin)
1631 usage(index_pack_usage);
1632 if (fix_thin_pack && !from_stdin)
1633 die(_("--fix-thin cannot be used without --stdin"));
1634 if (!index_name && pack_name) {
1635 size_t len;
1636 if (!strip_suffix(pack_name, ".pack", &len))
1637 die(_("packfile name '%s' does not end with '.pack'"),
1638 pack_name);
1639 strbuf_add(&index_name_buf, pack_name, len);
1640 strbuf_addstr(&index_name_buf, ".idx");
1641 index_name = index_name_buf.buf;
1642 }
1643 if (keep_msg && !keep_name && pack_name) {
1644 size_t len;
1645 if (!strip_suffix(pack_name, ".pack", &len))
1646 die(_("packfile name '%s' does not end with '.pack'"),
1647 pack_name);
1648 strbuf_add(&keep_name_buf, pack_name, len);
1649 strbuf_addstr(&keep_name_buf, ".idx");
1650 keep_name = keep_name_buf.buf;
1651 }
1652 if (verify) {
1653 if (!index_name)
1654 die(_("--verify with no packfile name given"));
1655 read_idx_option(&opts, index_name);
1656 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1657 }
1658 if (strict)
1659 opts.flags |= WRITE_IDX_STRICT;
1660#ifndef NO_PTHREADS
1662 if (!nr_threads) {
1663 nr_threads = online_cpus();
1664 /* An experiment showed that more threads does not mean faster */
1665 if (nr_threads > 3)
1666 nr_threads = 3;
1667 }
1668#endif
1669 curr_pack = open_pack_file(pack_name);
1671 parse_pack_header();
1672 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1673 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1674 parse_pack_objects(pack_sha1);
1675 resolve_deltas();
1676 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1677 free(deltas);
1678 if (strict)
1679 foreign_nr = check_objects();
1680 if (show_stat)
1682 show_pack_info(stat_only);
1683 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1685 for (i = 0; i < nr_objects; i++)
1686 idx_objects[i] = &objects[i].idx;
1687 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1688 free(idx_objects);
1689 if (!verify)
1691 final(pack_name, curr_pack,
1692 index_name, curr_index,
1693 keep_name, keep_msg,
1694 pack_sha1);
1695 else
1696 close(input_fd);
1697 free(objects);
1698 strbuf_release(&index_name_buf);
1699 strbuf_release(&keep_name_buf);
1700 if (pack_name == NULL)
1701 free((void *) curr_pack);
1702 if (index_name == NULL)
1703 free((void *) curr_index);
1704 /*
1706 * Let the caller know this pack is not self contained
1707 */
1708 if (check_self_contained_and_connected && foreign_nr)
1709 return 1;
1710 return 0;
1712}