1#include "builtin.h"
2#include "config.h"
3#include "delta.h"
4#include "pack.h"
5#include "csum-file.h"
6#include "blob.h"
7#include "commit.h"
8#include "tag.h"
9#include "tree.h"
10#include "progress.h"
11#include "fsck.h"
12#include "exec-cmd.h"
13#include "streaming.h"
14#include "thread-utils.h"
15#include "packfile.h"
16#include "object-store.h"
17static const char index_pack_usage[] =
19"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
20struct object_entry {
22 struct pack_idx_entry idx;
23 unsigned long size;
24 unsigned char hdr_size;
25 signed char type;
26 signed char real_type;
27};
28struct object_stat {
30 unsigned delta_depth;
31 int base_object_no;
32};
33struct base_data {
35 struct base_data *base;
36 struct base_data *child;
37 struct object_entry *obj;
38 void *data;
39 unsigned long size;
40 int ref_first, ref_last;
41 int ofs_first, ofs_last;
42};
43struct thread_local {
45#ifndef NO_PTHREADS
46 pthread_t thread;
47#endif
48 struct base_data *base_cache;
49 size_t base_cache_used;
50 int pack_fd;
51};
52/* Remember to update object flag allocation in object.h */
54#define FLAG_LINK (1u<<20)
55#define FLAG_CHECKED (1u<<21)
56struct ofs_delta_entry {
58 off_t offset;
59 int obj_no;
60};
61struct ref_delta_entry {
63 struct object_id oid;
64 int obj_no;
65};
66static struct object_entry *objects;
68static struct object_stat *obj_stat;
69static struct ofs_delta_entry *ofs_deltas;
70static struct ref_delta_entry *ref_deltas;
71static struct thread_local nothread_data;
72static int nr_objects;
73static int nr_ofs_deltas;
74static int nr_ref_deltas;
75static int ref_deltas_alloc;
76static int nr_resolved_deltas;
77static int nr_threads;
78static int from_stdin;
80static int strict;
81static int do_fsck_object;
82static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
83static int verbose;
84static int show_resolving_progress;
85static int show_stat;
86static int check_self_contained_and_connected;
87static struct progress *progress;
89/* We always read in 4kB chunks. */
91static unsigned char input_buffer[4096];
92static unsigned int input_offset, input_len;
93static off_t consumed_bytes;
94static off_t max_input_size;
95static unsigned deepest_delta;
96static git_hash_ctx input_ctx;
97static uint32_t input_crc32;
98static int input_fd, output_fd;
99static const char *curr_pack;
100#ifndef NO_PTHREADS
102static struct thread_local *thread_data;
104static int nr_dispatched;
105static int threads_active;
106static pthread_mutex_t read_mutex;
108#define read_lock() lock_mutex(&read_mutex)
109#define read_unlock() unlock_mutex(&read_mutex)
110static pthread_mutex_t counter_mutex;
112#define counter_lock() lock_mutex(&counter_mutex)
113#define counter_unlock() unlock_mutex(&counter_mutex)
114static pthread_mutex_t work_mutex;
116#define work_lock() lock_mutex(&work_mutex)
117#define work_unlock() unlock_mutex(&work_mutex)
118static pthread_mutex_t deepest_delta_mutex;
120#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
121#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
122static pthread_mutex_t type_cas_mutex;
124#define type_cas_lock() lock_mutex(&type_cas_mutex)
125#define type_cas_unlock() unlock_mutex(&type_cas_mutex)
126static pthread_key_t key;
128static inline void lock_mutex(pthread_mutex_t *mutex)
130{
131 if (threads_active)
132 pthread_mutex_lock(mutex);
133}
134static inline void unlock_mutex(pthread_mutex_t *mutex)
136{
137 if (threads_active)
138 pthread_mutex_unlock(mutex);
139}
140/*
142 * Mutex and conditional variable can't be statically-initialized on Windows.
143 */
144static void init_thread(void)
145{
146 int i;
147 init_recursive_mutex(&read_mutex);
148 pthread_mutex_init(&counter_mutex, NULL);
149 pthread_mutex_init(&work_mutex, NULL);
150 pthread_mutex_init(&type_cas_mutex, NULL);
151 if (show_stat)
152 pthread_mutex_init(&deepest_delta_mutex, NULL);
153 pthread_key_create(&key, NULL);
154 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
155 for (i = 0; i < nr_threads; i++) {
156 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
157 if (thread_data[i].pack_fd == -1)
158 die_errno(_("unable to open %s"), curr_pack);
159 }
160 threads_active = 1;
162}
163static void cleanup_thread(void)
165{
166 int i;
167 if (!threads_active)
168 return;
169 threads_active = 0;
170 pthread_mutex_destroy(&read_mutex);
171 pthread_mutex_destroy(&counter_mutex);
172 pthread_mutex_destroy(&work_mutex);
173 pthread_mutex_destroy(&type_cas_mutex);
174 if (show_stat)
175 pthread_mutex_destroy(&deepest_delta_mutex);
176 for (i = 0; i < nr_threads; i++)
177 close(thread_data[i].pack_fd);
178 pthread_key_delete(key);
179 free(thread_data);
180}
181#else
183#define read_lock()
185#define read_unlock()
186#define counter_lock()
188#define counter_unlock()
189#define work_lock()
191#define work_unlock()
192#define deepest_delta_lock()
194#define deepest_delta_unlock()
195#define type_cas_lock()
197#define type_cas_unlock()
198#endif
200static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
203{
204 if (!obj)
205 return -1;
206 if (type != OBJ_ANY && obj->type != type)
208 die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
209 obj->flags |= FLAG_LINK;
211 return 0;
212}
213/* The content of each linked object must have been checked
215 or it must be already present in the object database */
216static unsigned check_object(struct object *obj)
217{
218 if (!obj)
219 return 0;
220 if (!(obj->flags & FLAG_LINK))
222 return 0;
223 if (!(obj->flags & FLAG_CHECKED)) {
225 unsigned long size;
226 int type = oid_object_info(the_repository, &obj->oid, &size);
227 if (type <= 0)
228 die(_("did not receive expected object %s"),
229 oid_to_hex(&obj->oid));
230 if (type != obj->type)
231 die(_("object %s: expected type %s, found %s"),
232 oid_to_hex(&obj->oid),
233 type_name(obj->type), type_name(type));
234 obj->flags |= FLAG_CHECKED;
235 return 1;
236 }
237 return 0;
239}
240static unsigned check_objects(void)
242{
243 unsigned i, max, foreign_nr = 0;
244 max = get_max_object_index();
246 for (i = 0; i < max; i++)
247 foreign_nr += check_object(get_indexed_object(i));
248 return foreign_nr;
249}
250/* Discard current buffer used content. */
253static void flush(void)
254{
255 if (input_offset) {
256 if (output_fd >= 0)
257 write_or_die(output_fd, input_buffer, input_offset);
258 the_hash_algo->update_fn(&input_ctx, input_buffer, input_offset);
259 memmove(input_buffer, input_buffer + input_offset, input_len);
260 input_offset = 0;
261 }
262}
263/*
265 * Make sure at least "min" bytes are available in the buffer, and
266 * return the pointer to the buffer.
267 */
268static void *fill(int min)
269{
270 if (min <= input_len)
271 return input_buffer + input_offset;
272 if (min > sizeof(input_buffer))
273 die(Q_("cannot fill %d byte",
274 "cannot fill %d bytes",
275 min),
276 min);
277 flush();
278 do {
279 ssize_t ret = xread(input_fd, input_buffer + input_len,
280 sizeof(input_buffer) - input_len);
281 if (ret <= 0) {
282 if (!ret)
283 die(_("early EOF"));
284 die_errno(_("read error on input"));
285 }
286 input_len += ret;
287 if (from_stdin)
288 display_throughput(progress, consumed_bytes + input_len);
289 } while (input_len < min);
290 return input_buffer;
291}
292static void use(int bytes)
294{
295 if (bytes > input_len)
296 die(_("used more bytes than were available"));
297 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
298 input_len -= bytes;
299 input_offset += bytes;
300 /* make sure off_t is sufficiently large not to wrap */
302 if (signed_add_overflows(consumed_bytes, bytes))
303 die(_("pack too large for current definition of off_t"));
304 consumed_bytes += bytes;
305 if (max_input_size && consumed_bytes > max_input_size)
306 die(_("pack exceeds maximum allowed size"));
307}
308static const char *open_pack_file(const char *pack_name)
310{
311 if (from_stdin) {
312 input_fd = 0;
313 if (!pack_name) {
314 struct strbuf tmp_file = STRBUF_INIT;
315 output_fd = odb_mkstemp(&tmp_file,
316 "pack/tmp_pack_XXXXXX");
317 pack_name = strbuf_detach(&tmp_file, NULL);
318 } else {
319 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
320 if (output_fd < 0)
321 die_errno(_("unable to create '%s'"), pack_name);
322 }
323 nothread_data.pack_fd = output_fd;
324 } else {
325 input_fd = open(pack_name, O_RDONLY);
326 if (input_fd < 0)
327 die_errno(_("cannot open packfile '%s'"), pack_name);
328 output_fd = -1;
329 nothread_data.pack_fd = input_fd;
330 }
331 the_hash_algo->init_fn(&input_ctx);
332 return pack_name;
333}
334static void parse_pack_header(void)
336{
337 struct pack_header *hdr = fill(sizeof(struct pack_header));
338 /* Header consistency check */
340 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
341 die(_("pack signature mismatch"));
342 if (!pack_version_ok(hdr->hdr_version))
343 die(_("pack version %"PRIu32" unsupported"),
344 ntohl(hdr->hdr_version));
345 nr_objects = ntohl(hdr->hdr_entries);
347 use(sizeof(struct pack_header));
348}
349static NORETURN void bad_object(off_t offset, const char *format,
351 ...) __attribute__((format (printf, 2, 3)));
352static NORETURN void bad_object(off_t offset, const char *format, ...)
354{
355 va_list params;
356 char buf[1024];
357 va_start(params, format);
359 vsnprintf(buf, sizeof(buf), format, params);
360 va_end(params);
361 die(_("pack has bad object at offset %"PRIuMAX": %s"),
362 (uintmax_t)offset, buf);
363}
364static inline struct thread_local *get_thread_data(void)
366{
367#ifndef NO_PTHREADS
368 if (threads_active)
369 return pthread_getspecific(key);
370 assert(!threads_active &&
371 "This should only be reached when all threads are gone");
372#endif
373 return ¬hread_data;
374}
375#ifndef NO_PTHREADS
377static void set_thread_data(struct thread_local *data)
378{
379 if (threads_active)
380 pthread_setspecific(key, data);
381}
382#endif
383static struct base_data *alloc_base_data(void)
385{
386 struct base_data *base = xcalloc(1, sizeof(struct base_data));
387 base->ref_last = -1;
388 base->ofs_last = -1;
389 return base;
390}
391static void free_base_data(struct base_data *c)
393{
394 if (c->data) {
395 FREE_AND_NULL(c->data);
396 get_thread_data()->base_cache_used -= c->size;
397 }
398}
399static void prune_base_data(struct base_data *retain)
401{
402 struct base_data *b;
403 struct thread_local *data = get_thread_data();
404 for (b = data->base_cache;
405 data->base_cache_used > delta_base_cache_limit && b;
406 b = b->child) {
407 if (b->data && b != retain)
408 free_base_data(b);
409 }
410}
411static void link_base_data(struct base_data *base, struct base_data *c)
413{
414 if (base)
415 base->child = c;
416 else
417 get_thread_data()->base_cache = c;
418 c->base = base;
420 c->child = NULL;
421 if (c->data)
422 get_thread_data()->base_cache_used += c->size;
423 prune_base_data(c);
424}
425static void unlink_base_data(struct base_data *c)
427{
428 struct base_data *base = c->base;
429 if (base)
430 base->child = NULL;
431 else
432 get_thread_data()->base_cache = NULL;
433 free_base_data(c);
434}
435static int is_delta_type(enum object_type type)
437{
438 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
439}
440static void *unpack_entry_data(off_t offset, unsigned long size,
442 enum object_type type, struct object_id *oid)
443{
444 static char fixed_buf[8192];
445 int status;
446 git_zstream stream;
447 void *buf;
448 git_hash_ctx c;
449 char hdr[32];
450 int hdrlen;
451 if (!is_delta_type(type)) {
453 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX,
454 type_name(type),(uintmax_t)size) + 1;
455 the_hash_algo->init_fn(&c);
456 the_hash_algo->update_fn(&c, hdr, hdrlen);
457 } else
458 oid = NULL;
459 if (type == OBJ_BLOB && size > big_file_threshold)
460 buf = fixed_buf;
461 else
462 buf = xmallocz(size);
463 memset(&stream, 0, sizeof(stream));
465 git_inflate_init(&stream);
466 stream.next_out = buf;
467 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
468 do {
470 unsigned char *last_out = stream.next_out;
471 stream.next_in = fill(1);
472 stream.avail_in = input_len;
473 status = git_inflate(&stream, 0);
474 use(input_len - stream.avail_in);
475 if (oid)
476 the_hash_algo->update_fn(&c, last_out, stream.next_out - last_out);
477 if (buf == fixed_buf) {
478 stream.next_out = buf;
479 stream.avail_out = sizeof(fixed_buf);
480 }
481 } while (status == Z_OK);
482 if (stream.total_out != size || status != Z_STREAM_END)
483 bad_object(offset, _("inflate returned %d"), status);
484 git_inflate_end(&stream);
485 if (oid)
486 the_hash_algo->final_fn(oid->hash, &c);
487 return buf == fixed_buf ? NULL : buf;
488}
489static void *unpack_raw_entry(struct object_entry *obj,
491 off_t *ofs_offset,
492 struct object_id *ref_oid,
493 struct object_id *oid)
494{
495 unsigned char *p;
496 unsigned long size, c;
497 off_t base_offset;
498 unsigned shift;
499 void *data;
500 obj->idx.offset = consumed_bytes;
502 input_crc32 = crc32(0, NULL, 0);
503 p = fill(1);
505 c = *p;
506 use(1);
507 obj->type = (c >> 4) & 7;
508 size = (c & 15);
509 shift = 4;
510 while (c & 0x80) {
511 p = fill(1);
512 c = *p;
513 use(1);
514 size += (c & 0x7f) << shift;
515 shift += 7;
516 }
517 obj->size = size;
518 switch (obj->type) {
520 case OBJ_REF_DELTA:
521 hashcpy(ref_oid->hash, fill(the_hash_algo->rawsz));
522 use(the_hash_algo->rawsz);
523 break;
524 case OBJ_OFS_DELTA:
525 p = fill(1);
526 c = *p;
527 use(1);
528 base_offset = c & 127;
529 while (c & 128) {
530 base_offset += 1;
531 if (!base_offset || MSB(base_offset, 7))
532 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
533 p = fill(1);
534 c = *p;
535 use(1);
536 base_offset = (base_offset << 7) + (c & 127);
537 }
538 *ofs_offset = obj->idx.offset - base_offset;
539 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
540 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
541 break;
542 case OBJ_COMMIT:
543 case OBJ_TREE:
544 case OBJ_BLOB:
545 case OBJ_TAG:
546 break;
547 default:
548 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
549 }
550 obj->hdr_size = consumed_bytes - obj->idx.offset;
551 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, oid);
553 obj->idx.crc32 = input_crc32;
554 return data;
555}
556static void *unpack_data(struct object_entry *obj,
558 int (*consume)(const unsigned char *, unsigned long, void *),
559 void *cb_data)
560{
561 off_t from = obj[0].idx.offset + obj[0].hdr_size;
562 off_t len = obj[1].idx.offset - from;
563 unsigned char *data, *inbuf;
564 git_zstream stream;
565 int status;
566 data = xmallocz(consume ? 64*1024 : obj->size);
568 inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
569 memset(&stream, 0, sizeof(stream));
571 git_inflate_init(&stream);
572 stream.next_out = data;
573 stream.avail_out = consume ? 64*1024 : obj->size;
574 do {
576 ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
577 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
578 if (n < 0)
579 die_errno(_("cannot pread pack file"));
580 if (!n)
581 die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
582 "premature end of pack file, %"PRIuMAX" bytes missing",
583 (unsigned int)len),
584 (uintmax_t)len);
585 from += n;
586 len -= n;
587 stream.next_in = inbuf;
588 stream.avail_in = n;
589 if (!consume)
590 status = git_inflate(&stream, 0);
591 else {
592 do {
593 status = git_inflate(&stream, 0);
594 if (consume(data, stream.next_out - data, cb_data)) {
595 free(inbuf);
596 free(data);
597 return NULL;
598 }
599 stream.next_out = data;
600 stream.avail_out = 64*1024;
601 } while (status == Z_OK && stream.avail_in);
602 }
603 } while (len && status == Z_OK && !stream.avail_in);
604 /* This has been inflated OK when first encountered, so... */
606 if (status != Z_STREAM_END || stream.total_out != obj->size)
607 die(_("serious inflate inconsistency"));
608 git_inflate_end(&stream);
610 free(inbuf);
611 if (consume) {
612 FREE_AND_NULL(data);
613 }
614 return data;
615}
616static void *get_data_from_pack(struct object_entry *obj)
618{
619 return unpack_data(obj, NULL, NULL);
620}
621static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
623 enum object_type type1,
624 enum object_type type2)
625{
626 int cmp = type1 - type2;
627 if (cmp)
628 return cmp;
629 return offset1 < offset2 ? -1 :
630 offset1 > offset2 ? 1 :
631 0;
632}
633static int find_ofs_delta(const off_t offset, enum object_type type)
635{
636 int first = 0, last = nr_ofs_deltas;
637 while (first < last) {
639 int next = first + (last - first) / 2;
640 struct ofs_delta_entry *delta = &ofs_deltas[next];
641 int cmp;
642 cmp = compare_ofs_delta_bases(offset, delta->offset,
644 type, objects[delta->obj_no].type);
645 if (!cmp)
646 return next;
647 if (cmp < 0) {
648 last = next;
649 continue;
650 }
651 first = next+1;
652 }
653 return -first-1;
654}
655static void find_ofs_delta_children(off_t offset,
657 int *first_index, int *last_index,
658 enum object_type type)
659{
660 int first = find_ofs_delta(offset, type);
661 int last = first;
662 int end = nr_ofs_deltas - 1;
663 if (first < 0) {
665 *first_index = 0;
666 *last_index = -1;
667 return;
668 }
669 while (first > 0 && ofs_deltas[first - 1].offset == offset)
670 --first;
671 while (last < end && ofs_deltas[last + 1].offset == offset)
672 ++last;
673 *first_index = first;
674 *last_index = last;
675}
676static int compare_ref_delta_bases(const struct object_id *oid1,
678 const struct object_id *oid2,
679 enum object_type type1,
680 enum object_type type2)
681{
682 int cmp = type1 - type2;
683 if (cmp)
684 return cmp;
685 return oidcmp(oid1, oid2);
686}
687static int find_ref_delta(const struct object_id *oid, enum object_type type)
689{
690 int first = 0, last = nr_ref_deltas;
691 while (first < last) {
693 int next = first + (last - first) / 2;
694 struct ref_delta_entry *delta = &ref_deltas[next];
695 int cmp;
696 cmp = compare_ref_delta_bases(oid, &delta->oid,
698 type, objects[delta->obj_no].type);
699 if (!cmp)
700 return next;
701 if (cmp < 0) {
702 last = next;
703 continue;
704 }
705 first = next+1;
706 }
707 return -first-1;
708}
709static void find_ref_delta_children(const struct object_id *oid,
711 int *first_index, int *last_index,
712 enum object_type type)
713{
714 int first = find_ref_delta(oid, type);
715 int last = first;
716 int end = nr_ref_deltas - 1;
717 if (first < 0) {
719 *first_index = 0;
720 *last_index = -1;
721 return;
722 }
723 while (first > 0 && oideq(&ref_deltas[first - 1].oid, oid))
724 --first;
725 while (last < end && oideq(&ref_deltas[last + 1].oid, oid))
726 ++last;
727 *first_index = first;
728 *last_index = last;
729}
730struct compare_data {
732 struct object_entry *entry;
733 struct git_istream *st;
734 unsigned char *buf;
735 unsigned long buf_size;
736};
737static int compare_objects(const unsigned char *buf, unsigned long size,
739 void *cb_data)
740{
741 struct compare_data *data = cb_data;
742 if (data->buf_size < size) {
744 free(data->buf);
745 data->buf = xmalloc(size);
746 data->buf_size = size;
747 }
748 while (size) {
750 ssize_t len = read_istream(data->st, data->buf, size);
751 if (len == 0)
752 die(_("SHA1 COLLISION FOUND WITH %s !"),
753 oid_to_hex(&data->entry->idx.oid));
754 if (len < 0)
755 die(_("unable to read %s"),
756 oid_to_hex(&data->entry->idx.oid));
757 if (memcmp(buf, data->buf, len))
758 die(_("SHA1 COLLISION FOUND WITH %s !"),
759 oid_to_hex(&data->entry->idx.oid));
760 size -= len;
761 buf += len;
762 }
763 return 0;
764}
765static int check_collison(struct object_entry *entry)
767{
768 struct compare_data data;
769 enum object_type type;
770 unsigned long size;
771 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
773 return -1;
774 memset(&data, 0, sizeof(data));
776 data.entry = entry;
777 data.st = open_istream(&entry->idx.oid, &type, &size, NULL);
778 if (!data.st)
779 return -1;
780 if (size != entry->size || type != entry->type)
781 die(_("SHA1 COLLISION FOUND WITH %s !"),
782 oid_to_hex(&entry->idx.oid));
783 unpack_data(entry, compare_objects, &data);
784 close_istream(data.st);
785 free(data.buf);
786 return 0;
787}
788static void sha1_object(const void *data, struct object_entry *obj_entry,
790 unsigned long size, enum object_type type,
791 const struct object_id *oid)
792{
793 void *new_data = NULL;
794 int collision_test_needed = 0;
795 assert(data || obj_entry);
797 if (startup_info->have_repository) {
799 read_lock();
800 collision_test_needed =
801 has_sha1_file_with_flags(oid->hash, OBJECT_INFO_QUICK);
802 read_unlock();
803 }
804 if (collision_test_needed && !data) {
806 read_lock();
807 if (!check_collison(obj_entry))
808 collision_test_needed = 0;
809 read_unlock();
810 }
811 if (collision_test_needed) {
812 void *has_data;
813 enum object_type has_type;
814 unsigned long has_size;
815 read_lock();
816 has_type = oid_object_info(the_repository, oid, &has_size);
817 if (has_type < 0)
818 die(_("cannot read existing object info %s"), oid_to_hex(oid));
819 if (has_type != type || has_size != size)
820 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
821 has_data = read_object_file(oid, &has_type, &has_size);
822 read_unlock();
823 if (!data)
824 data = new_data = get_data_from_pack(obj_entry);
825 if (!has_data)
826 die(_("cannot read existing object %s"), oid_to_hex(oid));
827 if (size != has_size || type != has_type ||
828 memcmp(data, has_data, size) != 0)
829 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
830 free(has_data);
831 }
832 if (strict || do_fsck_object) {
834 read_lock();
835 if (type == OBJ_BLOB) {
836 struct blob *blob = lookup_blob(the_repository, oid);
837 if (blob)
838 blob->object.flags |= FLAG_CHECKED;
839 else
840 die(_("invalid blob object %s"), oid_to_hex(oid));
841 if (do_fsck_object &&
842 fsck_object(&blob->object, (void *)data, size, &fsck_options))
843 die(_("fsck error in packed object"));
844 } else {
845 struct object *obj;
846 int eaten;
847 void *buf = (void *) data;
848 assert(data && "data can only be NULL for large _blobs_");
850 /*
852 * we do not need to free the memory here, as the
853 * buf is deleted by the caller.
854 */
855 obj = parse_object_buffer(the_repository, oid, type,
856 size, buf,
857 &eaten);
858 if (!obj)
859 die(_("invalid %s"), type_name(type));
860 if (do_fsck_object &&
861 fsck_object(obj, buf, size, &fsck_options))
862 die(_("fsck error in packed object"));
863 if (strict && fsck_walk(obj, NULL, &fsck_options))
864 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
865 if (obj->type == OBJ_TREE) {
867 struct tree *item = (struct tree *) obj;
868 item->buffer = NULL;
869 obj->parsed = 0;
870 }
871 if (obj->type == OBJ_COMMIT) {
872 struct commit *commit = (struct commit *) obj;
873 if (detach_commit_buffer(commit, NULL) != data)
874 BUG("parse_object_buffer transmogrified our buffer");
875 }
876 obj->flags |= FLAG_CHECKED;
877 }
878 read_unlock();
879 }
880 free(new_data);
882}
883/*
885 * This function is part of find_unresolved_deltas(). There are two
886 * walkers going in the opposite ways.
887 *
888 * The first one in find_unresolved_deltas() traverses down from
889 * parent node to children, deflating nodes along the way. However,
890 * memory for deflated nodes is limited by delta_base_cache_limit, so
891 * at some point parent node's deflated content may be freed.
892 *
893 * The second walker is this function, which goes from current node up
894 * to top parent if necessary to deflate the node. In normal
895 * situation, its parent node would be already deflated, so it just
896 * needs to apply delta.
897 *
898 * In the worst case scenario, parent node is no longer deflated because
899 * we're running out of delta_base_cache_limit; we need to re-deflate
900 * parents, possibly up to the top base.
901 *
902 * All deflated objects here are subject to be freed if we exceed
903 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
904 * just need to make sure the last node is not freed.
905 */
906static void *get_base_data(struct base_data *c)
907{
908 if (!c->data) {
909 struct object_entry *obj = c->obj;
910 struct base_data **delta = NULL;
911 int delta_nr = 0, delta_alloc = 0;
912 while (is_delta_type(c->obj->type) && !c->data) {
914 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
915 delta[delta_nr++] = c;
916 c = c->base;
917 }
918 if (!delta_nr) {
919 c->data = get_data_from_pack(obj);
920 c->size = obj->size;
921 get_thread_data()->base_cache_used += c->size;
922 prune_base_data(c);
923 }
924 for (; delta_nr > 0; delta_nr--) {
925 void *base, *raw;
926 c = delta[delta_nr - 1];
927 obj = c->obj;
928 base = get_base_data(c->base);
929 raw = get_data_from_pack(obj);
930 c->data = patch_delta(
931 base, c->base->size,
932 raw, obj->size,
933 &c->size);
934 free(raw);
935 if (!c->data)
936 bad_object(obj->idx.offset, _("failed to apply delta"));
937 get_thread_data()->base_cache_used += c->size;
938 prune_base_data(c);
939 }
940 free(delta);
941 }
942 return c->data;
943}
944static void resolve_delta(struct object_entry *delta_obj,
946 struct base_data *base, struct base_data *result)
947{
948 void *base_data, *delta_data;
949 if (show_stat) {
951 int i = delta_obj - objects;
952 int j = base->obj - objects;
953 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
954 deepest_delta_lock();
955 if (deepest_delta < obj_stat[i].delta_depth)
956 deepest_delta = obj_stat[i].delta_depth;
957 deepest_delta_unlock();
958 obj_stat[i].base_object_no = j;
959 }
960 delta_data = get_data_from_pack(delta_obj);
961 base_data = get_base_data(base);
962 result->obj = delta_obj;
963 result->data = patch_delta(base_data, base->size,
964 delta_data, delta_obj->size, &result->size);
965 free(delta_data);
966 if (!result->data)
967 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
968 hash_object_file(result->data, result->size,
969 type_name(delta_obj->real_type), &delta_obj->idx.oid);
970 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
971 &delta_obj->idx.oid);
972 counter_lock();
973 nr_resolved_deltas++;
974 counter_unlock();
975}
976/*
978 * Standard boolean compare-and-swap: atomically check whether "*type" is
979 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
980 * and return false.
981 */
982static int compare_and_swap_type(signed char *type,
983 enum object_type want,
984 enum object_type set)
985{
986 enum object_type old;
987 type_cas_lock();
989 old = *type;
990 if (old == want)
991 *type = set;
992 type_cas_unlock();
993 return old == want;
995}
996static struct base_data *find_unresolved_deltas_1(struct base_data *base,
998 struct base_data *prev_base)
999{
1000 if (base->ref_last == -1 && base->ofs_last == -1) {
1001 find_ref_delta_children(&base->obj->idx.oid,
1002 &base->ref_first, &base->ref_last,
1003 OBJ_REF_DELTA);
1004 find_ofs_delta_children(base->obj->idx.offset,
1006 &base->ofs_first, &base->ofs_last,
1007 OBJ_OFS_DELTA);
1008 if (base->ref_last == -1 && base->ofs_last == -1) {
1010 free(base->data);
1011 return NULL;
1012 }
1013 link_base_data(prev_base, base);
1015 }
1016 if (base->ref_first <= base->ref_last) {
1018 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1019 struct base_data *result = alloc_base_data();
1020 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1022 base->obj->real_type))
1023 BUG("child->real_type != OBJ_REF_DELTA");
1024 resolve_delta(child, base, result);
1026 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1027 free_base_data(base);
1028 base->ref_first++;
1030 return result;
1031 }
1032 if (base->ofs_first <= base->ofs_last) {
1034 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1035 struct base_data *result = alloc_base_data();
1036 assert(child->real_type == OBJ_OFS_DELTA);
1038 child->real_type = base->obj->real_type;
1039 resolve_delta(child, base, result);
1040 if (base->ofs_first == base->ofs_last)
1041 free_base_data(base);
1042 base->ofs_first++;
1044 return result;
1045 }
1046 unlink_base_data(base);
1048 return NULL;
1049}
1050static void find_unresolved_deltas(struct base_data *base)
1052{
1053 struct base_data *new_base, *prev_base = NULL;
1054 for (;;) {
1055 new_base = find_unresolved_deltas_1(base, prev_base);
1056 if (new_base) {
1058 prev_base = base;
1059 base = new_base;
1060 } else {
1061 free(base);
1062 base = prev_base;
1063 if (!base)
1064 return;
1065 prev_base = base->base;
1066 }
1067 }
1068}
1069static int compare_ofs_delta_entry(const void *a, const void *b)
1071{
1072 const struct ofs_delta_entry *delta_a = a;
1073 const struct ofs_delta_entry *delta_b = b;
1074 return delta_a->offset < delta_b->offset ? -1 :
1076 delta_a->offset > delta_b->offset ? 1 :
1077 0;
1078}
1079static int compare_ref_delta_entry(const void *a, const void *b)
1081{
1082 const struct ref_delta_entry *delta_a = a;
1083 const struct ref_delta_entry *delta_b = b;
1084 return oidcmp(&delta_a->oid, &delta_b->oid);
1086}
1087static void resolve_base(struct object_entry *obj)
1089{
1090 struct base_data *base_obj = alloc_base_data();
1091 base_obj->obj = obj;
1092 base_obj->data = NULL;
1093 find_unresolved_deltas(base_obj);
1094}
1095#ifndef NO_PTHREADS
1097static void *threaded_second_pass(void *data)
1098{
1099 set_thread_data(data);
1100 for (;;) {
1101 int i;
1102 counter_lock();
1103 display_progress(progress, nr_resolved_deltas);
1104 counter_unlock();
1105 work_lock();
1106 while (nr_dispatched < nr_objects &&
1107 is_delta_type(objects[nr_dispatched].type))
1108 nr_dispatched++;
1109 if (nr_dispatched >= nr_objects) {
1110 work_unlock();
1111 break;
1112 }
1113 i = nr_dispatched++;
1114 work_unlock();
1115 resolve_base(&objects[i]);
1117 }
1118 return NULL;
1119}
1120#endif
1121/*
1123 * First pass:
1124 * - find locations of all objects;
1125 * - calculate SHA1 of all non-delta objects;
1126 * - remember base (SHA1 or offset) for all deltas.
1127 */
1128static void parse_pack_objects(unsigned char *hash)
1129{
1130 int i, nr_delays = 0;
1131 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1132 struct object_id ref_delta_oid;
1133 struct stat st;
1134 if (verbose)
1136 progress = start_progress(
1137 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1138 nr_objects);
1139 for (i = 0; i < nr_objects; i++) {
1140 struct object_entry *obj = &objects[i];
1141 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1142 &ref_delta_oid,
1143 &obj->idx.oid);
1144 obj->real_type = obj->type;
1145 if (obj->type == OBJ_OFS_DELTA) {
1146 nr_ofs_deltas++;
1147 ofs_delta->obj_no = i;
1148 ofs_delta++;
1149 } else if (obj->type == OBJ_REF_DELTA) {
1150 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1151 oidcpy(&ref_deltas[nr_ref_deltas].oid, &ref_delta_oid);
1152 ref_deltas[nr_ref_deltas].obj_no = i;
1153 nr_ref_deltas++;
1154 } else if (!data) {
1155 /* large blobs, check later */
1156 obj->real_type = OBJ_BAD;
1157 nr_delays++;
1158 } else
1159 sha1_object(data, NULL, obj->size, obj->type,
1160 &obj->idx.oid);
1161 free(data);
1162 display_progress(progress, i+1);
1163 }
1164 objects[i].idx.offset = consumed_bytes;
1165 stop_progress(&progress);
1166 /* Check pack integrity */
1168 flush();
1169 the_hash_algo->final_fn(hash, &input_ctx);
1170 if (!hasheq(fill(the_hash_algo->rawsz), hash))
1171 die(_("pack is corrupted (SHA1 mismatch)"));
1172 use(the_hash_algo->rawsz);
1173 /* If input_fd is a file, we should have reached its end now. */
1175 if (fstat(input_fd, &st))
1176 die_errno(_("cannot fstat packfile"));
1177 if (S_ISREG(st.st_mode) &&
1178 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1179 die(_("pack has junk at the end"));
1180 for (i = 0; i < nr_objects; i++) {
1182 struct object_entry *obj = &objects[i];
1183 if (obj->real_type != OBJ_BAD)
1184 continue;
1185 obj->real_type = obj->type;
1186 sha1_object(NULL, obj, obj->size, obj->type,
1187 &obj->idx.oid);
1188 nr_delays--;
1189 }
1190 if (nr_delays)
1191 die(_("confusion beyond insanity in parse_pack_objects()"));
1192}
1193/*
1195 * Second pass:
1196 * - for all non-delta objects, look if it is used as a base for
1197 * deltas;
1198 * - if used as a base, uncompress the object and apply all deltas,
1199 * recursively checking if the resulting object is used as a base
1200 * for some more deltas.
1201 */
1202static void resolve_deltas(void)
1203{
1204 int i;
1205 if (!nr_ofs_deltas && !nr_ref_deltas)
1207 return;
1208 /* Sort deltas by base SHA1/offset for fast searching */
1210 QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
1211 QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
1212 if (verbose || show_resolving_progress)
1214 progress = start_progress(_("Resolving deltas"),
1215 nr_ref_deltas + nr_ofs_deltas);
1216#ifndef NO_PTHREADS
1218 nr_dispatched = 0;
1219 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1220 init_thread();
1221 for (i = 0; i < nr_threads; i++) {
1222 int ret = pthread_create(&thread_data[i].thread, NULL,
1223 threaded_second_pass, thread_data + i);
1224 if (ret)
1225 die(_("unable to create thread: %s"),
1226 strerror(ret));
1227 }
1228 for (i = 0; i < nr_threads; i++)
1229 pthread_join(thread_data[i].thread, NULL);
1230 cleanup_thread();
1231 return;
1232 }
1233#endif
1234 for (i = 0; i < nr_objects; i++) {
1236 struct object_entry *obj = &objects[i];
1237 if (is_delta_type(obj->type))
1239 continue;
1240 resolve_base(obj);
1241 display_progress(progress, nr_resolved_deltas);
1242 }
1243}
1244/*
1246 * Third pass:
1247 * - append objects to convert thin pack to full pack if required
1248 * - write the final pack hash
1249 */
1250static void fix_unresolved_deltas(struct hashfile *f);
1251static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_hash)
1252{
1253 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1254 stop_progress(&progress);
1255 /* Flush remaining pack final hash. */
1256 flush();
1257 return;
1258 }
1259 if (fix_thin_pack) {
1261 struct hashfile *f;
1262 unsigned char read_hash[GIT_MAX_RAWSZ], tail_hash[GIT_MAX_RAWSZ];
1263 struct strbuf msg = STRBUF_INIT;
1264 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1265 int nr_objects_initial = nr_objects;
1266 if (nr_unresolved <= 0)
1267 die(_("confusion beyond insanity"));
1268 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1269 memset(objects + nr_objects + 1, 0,
1270 nr_unresolved * sizeof(*objects));
1271 f = hashfd(output_fd, curr_pack);
1272 fix_unresolved_deltas(f);
1273 strbuf_addf(&msg, Q_("completed with %d local object",
1274 "completed with %d local objects",
1275 nr_objects - nr_objects_initial),
1276 nr_objects - nr_objects_initial);
1277 stop_progress_msg(&progress, msg.buf);
1278 strbuf_release(&msg);
1279 finalize_hashfile(f, tail_hash, 0);
1280 hashcpy(read_hash, pack_hash);
1281 fixup_pack_header_footer(output_fd, pack_hash,
1282 curr_pack, nr_objects,
1283 read_hash, consumed_bytes-the_hash_algo->rawsz);
1284 if (!hasheq(read_hash, tail_hash))
1285 die(_("Unexpected tail checksum for %s "
1286 "(disk corruption?)"), curr_pack);
1287 }
1288 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1289 die(Q_("pack has %d unresolved delta",
1290 "pack has %d unresolved deltas",
1291 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1292 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1293}
1294static int write_compressed(struct hashfile *f, void *in, unsigned int size)
1296{
1297 git_zstream stream;
1298 int status;
1299 unsigned char outbuf[4096];
1300 git_deflate_init(&stream, zlib_compression_level);
1302 stream.next_in = in;
1303 stream.avail_in = size;
1304 do {
1306 stream.next_out = outbuf;
1307 stream.avail_out = sizeof(outbuf);
1308 status = git_deflate(&stream, Z_FINISH);
1309 hashwrite(f, outbuf, sizeof(outbuf) - stream.avail_out);
1310 } while (status == Z_OK);
1311 if (status != Z_STREAM_END)
1313 die(_("unable to deflate appended object (%d)"), status);
1314 size = stream.total_out;
1315 git_deflate_end(&stream);
1316 return size;
1317}
1318static struct object_entry *append_obj_to_pack(struct hashfile *f,
1320 const unsigned char *sha1, void *buf,
1321 unsigned long size, enum object_type type)
1322{
1323 struct object_entry *obj = &objects[nr_objects++];
1324 unsigned char header[10];
1325 unsigned long s = size;
1326 int n = 0;
1327 unsigned char c = (type << 4) | (s & 15);
1328 s >>= 4;
1329 while (s) {
1330 header[n++] = c | 0x80;
1331 c = s & 0x7f;
1332 s >>= 7;
1333 }
1334 header[n++] = c;
1335 crc32_begin(f);
1336 hashwrite(f, header, n);
1337 obj[0].size = size;
1338 obj[0].hdr_size = n;
1339 obj[0].type = type;
1340 obj[0].real_type = type;
1341 obj[1].idx.offset = obj[0].idx.offset + n;
1342 obj[1].idx.offset += write_compressed(f, buf, size);
1343 obj[0].idx.crc32 = crc32_end(f);
1344 hashflush(f);
1345 hashcpy(obj->idx.oid.hash, sha1);
1346 return obj;
1347}
1348static int delta_pos_compare(const void *_a, const void *_b)
1350{
1351 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1352 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1353 return a->obj_no - b->obj_no;
1354}
1355static void fix_unresolved_deltas(struct hashfile *f)
1357{
1358 struct ref_delta_entry **sorted_by_pos;
1359 int i;
1360 /*
1362 * Since many unresolved deltas may well be themselves base objects
1363 * for more unresolved deltas, we really want to include the
1364 * smallest number of base objects that would cover as much delta
1365 * as possible by picking the
1366 * trunc deltas first, allowing for other deltas to resolve without
1367 * additional base objects. Since most base objects are to be found
1368 * before deltas depending on them, a good heuristic is to start
1369 * resolving deltas in the same order as their position in the pack.
1370 */
1371 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1372 for (i = 0; i < nr_ref_deltas; i++)
1373 sorted_by_pos[i] = &ref_deltas[i];
1374 QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
1375 for (i = 0; i < nr_ref_deltas; i++) {
1377 struct ref_delta_entry *d = sorted_by_pos[i];
1378 enum object_type type;
1379 struct base_data *base_obj = alloc_base_data();
1380 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1382 continue;
1383 base_obj->data = read_object_file(&d->oid, &type,
1384 &base_obj->size);
1385 if (!base_obj->data)
1386 continue;
1387 if (check_object_signature(&d->oid, base_obj->data,
1389 base_obj->size, type_name(type)))
1390 die(_("local object %s is corrupt"), oid_to_hex(&d->oid));
1391 base_obj->obj = append_obj_to_pack(f, d->oid.hash,
1392 base_obj->data, base_obj->size, type);
1393 find_unresolved_deltas(base_obj);
1394 display_progress(progress, nr_resolved_deltas);
1395 }
1396 free(sorted_by_pos);
1397}
1398static const char *derive_filename(const char *pack_name, const char *suffix,
1400 struct strbuf *buf)
1401{
1402 size_t len;
1403 if (!strip_suffix(pack_name, ".pack", &len))
1404 die(_("packfile name '%s' does not end with '.pack'"),
1405 pack_name);
1406 strbuf_add(buf, pack_name, len);
1407 strbuf_addch(buf, '.');
1408 strbuf_addstr(buf, suffix);
1409 return buf->buf;
1410}
1411static void write_special_file(const char *suffix, const char *msg,
1413 const char *pack_name, const unsigned char *hash,
1414 const char **report)
1415{
1416 struct strbuf name_buf = STRBUF_INIT;
1417 const char *filename;
1418 int fd;
1419 int msg_len = strlen(msg);
1420 if (pack_name)
1422 filename = derive_filename(pack_name, suffix, &name_buf);
1423 else
1424 filename = odb_pack_name(&name_buf, hash, suffix);
1425 fd = odb_pack_keep(filename);
1427 if (fd < 0) {
1428 if (errno != EEXIST)
1429 die_errno(_("cannot write %s file '%s'"),
1430 suffix, filename);
1431 } else {
1432 if (msg_len > 0) {
1433 write_or_die(fd, msg, msg_len);
1434 write_or_die(fd, "\n", 1);
1435 }
1436 if (close(fd) != 0)
1437 die_errno(_("cannot close written %s file '%s'"),
1438 suffix, filename);
1439 if (report)
1440 *report = suffix;
1441 }
1442 strbuf_release(&name_buf);
1443}
1444static void final(const char *final_pack_name, const char *curr_pack_name,
1446 const char *final_index_name, const char *curr_index_name,
1447 const char *keep_msg, const char *promisor_msg,
1448 unsigned char *hash)
1449{
1450 const char *report = "pack";
1451 struct strbuf pack_name = STRBUF_INIT;
1452 struct strbuf index_name = STRBUF_INIT;
1453 int err;
1454 if (!from_stdin) {
1456 close(input_fd);
1457 } else {
1458 fsync_or_die(output_fd, curr_pack_name);
1459 err = close(output_fd);
1460 if (err)
1461 die_errno(_("error while closing pack file"));
1462 }
1463 if (keep_msg)
1465 write_special_file("keep", keep_msg, final_pack_name, hash,
1466 &report);
1467 if (promisor_msg)
1468 write_special_file("promisor", promisor_msg, final_pack_name,
1469 hash, NULL);
1470 if (final_pack_name != curr_pack_name) {
1472 if (!final_pack_name)
1473 final_pack_name = odb_pack_name(&pack_name, hash, "pack");
1474 if (finalize_object_file(curr_pack_name, final_pack_name))
1475 die(_("cannot store pack file"));
1476 } else if (from_stdin)
1477 chmod(final_pack_name, 0444);
1478 if (final_index_name != curr_index_name) {
1480 if (!final_index_name)
1481 final_index_name = odb_pack_name(&index_name, hash, "idx");
1482 if (finalize_object_file(curr_index_name, final_index_name))
1483 die(_("cannot store index file"));
1484 } else
1485 chmod(final_index_name, 0444);
1486 if (do_fsck_object) {
1488 struct packed_git *p;
1489 p = add_packed_git(final_index_name, strlen(final_index_name), 0);
1490 if (p)
1491 install_packed_git(the_repository, p);
1492 }
1493 if (!from_stdin) {
1495 printf("%s\n", sha1_to_hex(hash));
1496 } else {
1497 struct strbuf buf = STRBUF_INIT;
1498 strbuf_addf(&buf, "%s\t%s\n", report, sha1_to_hex(hash));
1500 write_or_die(1, buf.buf, buf.len);
1501 strbuf_release(&buf);
1502 /*
1504 * Let's just mimic git-unpack-objects here and write
1505 * the last part of the input buffer to stdout.
1506 */
1507 while (input_len) {
1508 err = xwrite(1, input_buffer + input_offset, input_len);
1509 if (err <= 0)
1510 break;
1511 input_len -= err;
1512 input_offset += err;
1513 }
1514 }
1515 strbuf_release(&index_name);
1517 strbuf_release(&pack_name);
1518}
1519static int git_index_pack_config(const char *k, const char *v, void *cb)
1521{
1522 struct pack_idx_option *opts = cb;
1523 if (!strcmp(k, "pack.indexversion")) {
1525 opts->version = git_config_int(k, v);
1526 if (opts->version > 2)
1527 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1528 return 0;
1529 }
1530 if (!strcmp(k, "pack.threads")) {
1531 nr_threads = git_config_int(k, v);
1532 if (nr_threads < 0)
1533 die(_("invalid number of threads specified (%d)"),
1534 nr_threads);
1535#ifdef NO_PTHREADS
1536 if (nr_threads != 1)
1537 warning(_("no threads support, ignoring %s"), k);
1538 nr_threads = 1;
1539#endif
1540 return 0;
1541 }
1542 return git_default_config(k, v, cb);
1543}
1544static int cmp_uint32(const void *a_, const void *b_)
1546{
1547 uint32_t a = *((uint32_t *)a_);
1548 uint32_t b = *((uint32_t *)b_);
1549 return (a < b) ? -1 : (a != b);
1551}
1552static void read_v2_anomalous_offsets(struct packed_git *p,
1554 struct pack_idx_option *opts)
1555{
1556 const uint32_t *idx1, *idx2;
1557 uint32_t i;
1558 const uint32_t hashwords = the_hash_algo->rawsz / sizeof(uint32_t);
1559 /* The address of the 4-byte offset table */
1561 idx1 = (((const uint32_t *)p->index_data)
1562 + 2 /* 8-byte header */
1563 + 256 /* fan out */
1564 + hashwords * p->num_objects /* object ID table */
1565 + p->num_objects /* CRC32 table */
1566 );
1567 /* The address of the 8-byte offset table */
1569 idx2 = idx1 + p->num_objects;
1570 for (i = 0; i < p->num_objects; i++) {
1572 uint32_t off = ntohl(idx1[i]);
1573 if (!(off & 0x80000000))
1574 continue;
1575 off = off & 0x7fffffff;
1576 check_pack_index_ptr(p, &idx2[off * 2]);
1577 if (idx2[off * 2])
1578 continue;
1579 /*
1580 * The real offset is ntohl(idx2[off * 2]) in high 4
1581 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1582 * octets. But idx2[off * 2] is Zero!!!
1583 */
1584 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1585 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1586 }
1587 QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
1589}
1590static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1592{
1593 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1594 if (!p)
1596 die(_("Cannot open existing pack file '%s'"), pack_name);
1597 if (open_pack_index(p))
1598 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1599 /* Read the attributes from the existing idx file */
1601 opts->version = p->index_version;
1602 if (opts->version == 2)
1604 read_v2_anomalous_offsets(p, opts);
1605 /*
1607 * Get rid of the idx file as we do not need it anymore.
1608 * NEEDSWORK: extract this bit from free_pack_by_name() in
1609 * sha1-file.c, perhaps? It shouldn't matter very much as we
1610 * know we haven't installed this pack (hence we never have
1611 * read anything from it).
1612 */
1613 close_pack_index(p);
1614 free(p);
1615}
1616static void show_pack_info(int stat_only)
1618{
1619 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1620 unsigned long *chain_histogram = NULL;
1621 if (deepest_delta)
1623 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1624 for (i = 0; i < nr_objects; i++) {
1626 struct object_entry *obj = &objects[i];
1627 if (is_delta_type(obj->type))
1629 chain_histogram[obj_stat[i].delta_depth - 1]++;
1630 if (stat_only)
1631 continue;
1632 printf("%s %-6s %"PRIuMAX" %"PRIuMAX" %"PRIuMAX,
1633 oid_to_hex(&obj->idx.oid),
1634 type_name(obj->real_type), (uintmax_t)obj->size,
1635 (uintmax_t)(obj[1].idx.offset - obj->idx.offset),
1636 (uintmax_t)obj->idx.offset);
1637 if (is_delta_type(obj->type)) {
1638 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1639 printf(" %u %s", obj_stat[i].delta_depth,
1640 oid_to_hex(&bobj->idx.oid));
1641 }
1642 putchar('\n');
1643 }
1644 if (baseobjects)
1646 printf_ln(Q_("non delta: %d object",
1647 "non delta: %d objects",
1648 baseobjects),
1649 baseobjects);
1650 for (i = 0; i < deepest_delta; i++) {
1651 if (!chain_histogram[i])
1652 continue;
1653 printf_ln(Q_("chain length = %d: %lu object",
1654 "chain length = %d: %lu objects",
1655 chain_histogram[i]),
1656 i + 1,
1657 chain_histogram[i]);
1658 }
1659}
1660int cmd_index_pack(int argc, const char **argv, const char *prefix)
1662{
1663 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1664 const char *curr_index;
1665 const char *index_name = NULL, *pack_name = NULL;
1666 const char *keep_msg = NULL;
1667 const char *promisor_msg = NULL;
1668 struct strbuf index_name_buf = STRBUF_INIT;
1669 struct pack_idx_entry **idx_objects;
1670 struct pack_idx_option opts;
1671 unsigned char pack_hash[GIT_MAX_RAWSZ];
1672 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1673 int report_end_of_input = 0;
1674 /*
1676 * index-pack never needs to fetch missing objects, since it only
1677 * accesses the repo to do hash collision checks
1678 */
1679 fetch_if_missing = 0;
1680 if (argc == 2 && !strcmp(argv[1], "-h"))
1682 usage(index_pack_usage);
1683 read_replace_refs = 0;
1685 fsck_options.walk = mark_link;
1686 reset_pack_idx_option(&opts);
1688 git_config(git_index_pack_config, &opts);
1689 if (prefix && chdir(prefix))
1690 die(_("Cannot come back to cwd"));
1691 for (i = 1; i < argc; i++) {
1693 const char *arg = argv[i];
1694 if (*arg == '-') {
1696 if (!strcmp(arg, "--stdin")) {
1697 from_stdin = 1;
1698 } else if (!strcmp(arg, "--fix-thin")) {
1699 fix_thin_pack = 1;
1700 } else if (skip_to_optional_arg(arg, "--strict", &arg)) {
1701 strict = 1;
1702 do_fsck_object = 1;
1703 fsck_set_msg_types(&fsck_options, arg);
1704 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1705 strict = 1;
1706 check_self_contained_and_connected = 1;
1707 } else if (!strcmp(arg, "--fsck-objects")) {
1708 do_fsck_object = 1;
1709 } else if (!strcmp(arg, "--verify")) {
1710 verify = 1;
1711 } else if (!strcmp(arg, "--verify-stat")) {
1712 verify = 1;
1713 show_stat = 1;
1714 } else if (!strcmp(arg, "--verify-stat-only")) {
1715 verify = 1;
1716 show_stat = 1;
1717 stat_only = 1;
1718 } else if (skip_to_optional_arg(arg, "--keep", &keep_msg)) {
1719 ; /* nothing to do */
1720 } else if (skip_to_optional_arg(arg, "--promisor", &promisor_msg)) {
1721 ; /* already parsed */
1722 } else if (starts_with(arg, "--threads=")) {
1723 char *end;
1724 nr_threads = strtoul(arg+10, &end, 0);
1725 if (!arg[10] || *end || nr_threads < 0)
1726 usage(index_pack_usage);
1727#ifdef NO_PTHREADS
1728 if (nr_threads != 1)
1729 warning(_("no threads support, "
1730 "ignoring %s"), arg);
1731 nr_threads = 1;
1732#endif
1733 } else if (starts_with(arg, "--pack_header=")) {
1734 struct pack_header *hdr;
1735 char *c;
1736 hdr = (struct pack_header *)input_buffer;
1738 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1739 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1740 if (*c != ',')
1741 die(_("bad %s"), arg);
1742 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1743 if (*c)
1744 die(_("bad %s"), arg);
1745 input_len = sizeof(*hdr);
1746 } else if (!strcmp(arg, "-v")) {
1747 verbose = 1;
1748 } else if (!strcmp(arg, "--show-resolving-progress")) {
1749 show_resolving_progress = 1;
1750 } else if (!strcmp(arg, "--report-end-of-input")) {
1751 report_end_of_input = 1;
1752 } else if (!strcmp(arg, "-o")) {
1753 if (index_name || (i+1) >= argc)
1754 usage(index_pack_usage);
1755 index_name = argv[++i];
1756 } else if (starts_with(arg, "--index-version=")) {
1757 char *c;
1758 opts.version = strtoul(arg + 16, &c, 10);
1759 if (opts.version > 2)
1760 die(_("bad %s"), arg);
1761 if (*c == ',')
1762 opts.off32_limit = strtoul(c+1, &c, 0);
1763 if (*c || opts.off32_limit & 0x80000000)
1764 die(_("bad %s"), arg);
1765 } else if (skip_prefix(arg, "--max-input-size=", &arg)) {
1766 max_input_size = strtoumax(arg, NULL, 10);
1767 } else
1768 usage(index_pack_usage);
1769 continue;
1770 }
1771 if (pack_name)
1773 usage(index_pack_usage);
1774 pack_name = arg;
1775 }
1776 if (!pack_name && !from_stdin)
1778 usage(index_pack_usage);
1779 if (fix_thin_pack && !from_stdin)
1780 die(_("--fix-thin cannot be used without --stdin"));
1781 if (from_stdin && !startup_info->have_repository)
1782 die(_("--stdin requires a git repository"));
1783 if (!index_name && pack_name)
1784 index_name = derive_filename(pack_name, "idx", &index_name_buf);
1785 if (verify) {
1787 if (!index_name)
1788 die(_("--verify with no packfile name given"));
1789 read_idx_option(&opts, index_name);
1790 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1791 }
1792 if (strict)
1793 opts.flags |= WRITE_IDX_STRICT;
1794#ifndef NO_PTHREADS
1796 if (!nr_threads) {
1797 nr_threads = online_cpus();
1798 /* An experiment showed that more threads does not mean faster */
1799 if (nr_threads > 3)
1800 nr_threads = 3;
1801 }
1802#endif
1803 curr_pack = open_pack_file(pack_name);
1805 parse_pack_header();
1806 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1807 if (show_stat)
1808 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1809 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1810 parse_pack_objects(pack_hash);
1811 if (report_end_of_input)
1812 write_in_full(2, "\0", 1);
1813 resolve_deltas();
1814 conclude_pack(fix_thin_pack, curr_pack, pack_hash);
1815 free(ofs_deltas);
1816 free(ref_deltas);
1817 if (strict)
1818 foreign_nr = check_objects();
1819 if (show_stat)
1821 show_pack_info(stat_only);
1822 ALLOC_ARRAY(idx_objects, nr_objects);
1824 for (i = 0; i < nr_objects; i++)
1825 idx_objects[i] = &objects[i].idx;
1826 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_hash);
1827 free(idx_objects);
1828 if (!verify)
1830 final(pack_name, curr_pack,
1831 index_name, curr_index,
1832 keep_msg, promisor_msg,
1833 pack_hash);
1834 else
1835 close(input_fd);
1836 if (do_fsck_object && fsck_finish(&fsck_options))
1838 die(_("fsck error in pack objects"));
1839 free(objects);
1841 strbuf_release(&index_name_buf);
1842 if (pack_name == NULL)
1843 free((void *) curr_pack);
1844 if (index_name == NULL)
1845 free((void *) curr_index);
1846 /*
1848 * Let the caller know this pack is not self contained
1849 */
1850 if (check_self_contained_and_connected && foreign_nr)
1851 return 1;
1852 return 0;
1854}