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 char hdr_size;
22 signed char type;
23 signed char real_type;
24};
25struct object_stat {
27 unsigned delta_depth;
28 int base_object_no;
29};
30struct base_data {
32 struct base_data *base;
33 struct base_data *child;
34 struct object_entry *obj;
35 void *data;
36 unsigned long size;
37 int ref_first, ref_last;
38 int ofs_first, ofs_last;
39};
40struct thread_local {
42#ifndef NO_PTHREADS
43 pthread_t thread;
44#endif
45 struct base_data *base_cache;
46 size_t base_cache_used;
47 int pack_fd;
48};
49#define FLAG_LINK (1u<<20)
51#define FLAG_CHECKED (1u<<21)
52struct ofs_delta_entry {
54 off_t offset;
55 int obj_no;
56};
57struct ref_delta_entry {
59 unsigned char sha1[20];
60 int obj_no;
61};
62static struct object_entry *objects;
64static struct object_stat *obj_stat;
65static struct ofs_delta_entry *ofs_deltas;
66static struct ref_delta_entry *ref_deltas;
67static struct thread_local nothread_data;
68static int nr_objects;
69static int nr_ofs_deltas;
70static int nr_ref_deltas;
71static int ref_deltas_alloc;
72static int nr_resolved_deltas;
73static int nr_threads;
74static int from_stdin;
76static int strict;
77static int do_fsck_object;
78static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
79static int verbose;
80static int show_resolving_progress;
81static int show_stat;
82static int check_self_contained_and_connected;
83static struct progress *progress;
85/* We always read in 4kB chunks. */
87static unsigned char input_buffer[4096];
88static unsigned int input_offset, input_len;
89static off_t consumed_bytes;
90static off_t max_input_size;
91static unsigned deepest_delta;
92static git_SHA_CTX input_ctx;
93static uint32_t input_crc32;
94static int input_fd, output_fd;
95static const char *curr_pack;
96#ifndef NO_PTHREADS
98static struct thread_local *thread_data;
100static int nr_dispatched;
101static int threads_active;
102static pthread_mutex_t read_mutex;
104#define read_lock() lock_mutex(&read_mutex)
105#define read_unlock() unlock_mutex(&read_mutex)
106static pthread_mutex_t counter_mutex;
108#define counter_lock() lock_mutex(&counter_mutex)
109#define counter_unlock() unlock_mutex(&counter_mutex)
110static pthread_mutex_t work_mutex;
112#define work_lock() lock_mutex(&work_mutex)
113#define work_unlock() unlock_mutex(&work_mutex)
114static pthread_mutex_t deepest_delta_mutex;
116#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
117#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
118static pthread_mutex_t type_cas_mutex;
120#define type_cas_lock() lock_mutex(&type_cas_mutex)
121#define type_cas_unlock() unlock_mutex(&type_cas_mutex)
122static pthread_key_t key;
124static inline void lock_mutex(pthread_mutex_t *mutex)
126{
127 if (threads_active)
128 pthread_mutex_lock(mutex);
129}
130static inline void unlock_mutex(pthread_mutex_t *mutex)
132{
133 if (threads_active)
134 pthread_mutex_unlock(mutex);
135}
136/*
138 * Mutex and conditional variable can't be statically-initialized on Windows.
139 */
140static void init_thread(void)
141{
142 int i;
143 init_recursive_mutex(&read_mutex);
144 pthread_mutex_init(&counter_mutex, NULL);
145 pthread_mutex_init(&work_mutex, NULL);
146 pthread_mutex_init(&type_cas_mutex, NULL);
147 if (show_stat)
148 pthread_mutex_init(&deepest_delta_mutex, NULL);
149 pthread_key_create(&key, NULL);
150 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
151 for (i = 0; i < nr_threads; i++) {
152 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
153 if (thread_data[i].pack_fd == -1)
154 die_errno(_("unable to open %s"), curr_pack);
155 }
156 threads_active = 1;
158}
159static void cleanup_thread(void)
161{
162 int i;
163 if (!threads_active)
164 return;
165 threads_active = 0;
166 pthread_mutex_destroy(&read_mutex);
167 pthread_mutex_destroy(&counter_mutex);
168 pthread_mutex_destroy(&work_mutex);
169 pthread_mutex_destroy(&type_cas_mutex);
170 if (show_stat)
171 pthread_mutex_destroy(&deepest_delta_mutex);
172 for (i = 0; i < nr_threads; i++)
173 close(thread_data[i].pack_fd);
174 pthread_key_delete(key);
175 free(thread_data);
176}
177#else
179#define read_lock()
181#define read_unlock()
182#define counter_lock()
184#define counter_unlock()
185#define work_lock()
187#define work_unlock()
188#define deepest_delta_lock()
190#define deepest_delta_unlock()
191#define type_cas_lock()
193#define type_cas_unlock()
194#endif
196static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
199{
200 if (!obj)
201 return -1;
202 if (type != OBJ_ANY && obj->type != type)
204 die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
205 obj->flags |= FLAG_LINK;
207 return 0;
208}
209/* The content of each linked object must have been checked
211 or it must be already present in the object database */
212static unsigned check_object(struct object *obj)
213{
214 if (!obj)
215 return 0;
216 if (!(obj->flags & FLAG_LINK))
218 return 0;
219 if (!(obj->flags & FLAG_CHECKED)) {
221 unsigned long size;
222 int type = sha1_object_info(obj->oid.hash, &size);
223 if (type <= 0)
224 die(_("did not receive expected object %s"),
225 oid_to_hex(&obj->oid));
226 if (type != obj->type)
227 die(_("object %s: expected type %s, found %s"),
228 oid_to_hex(&obj->oid),
229 typename(obj->type), typename(type));
230 obj->flags |= FLAG_CHECKED;
231 return 1;
232 }
233 return 0;
235}
236static unsigned check_objects(void)
238{
239 unsigned i, max, foreign_nr = 0;
240 max = get_max_object_index();
242 for (i = 0; i < max; i++)
243 foreign_nr += check_object(get_indexed_object(i));
244 return foreign_nr;
245}
246/* Discard current buffer used content. */
249static void flush(void)
250{
251 if (input_offset) {
252 if (output_fd >= 0)
253 write_or_die(output_fd, input_buffer, input_offset);
254 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
255 memmove(input_buffer, input_buffer + input_offset, input_len);
256 input_offset = 0;
257 }
258}
259/*
261 * Make sure at least "min" bytes are available in the buffer, and
262 * return the pointer to the buffer.
263 */
264static void *fill(int min)
265{
266 if (min <= input_len)
267 return input_buffer + input_offset;
268 if (min > sizeof(input_buffer))
269 die(Q_("cannot fill %d byte",
270 "cannot fill %d bytes",
271 min),
272 min);
273 flush();
274 do {
275 ssize_t ret = xread(input_fd, input_buffer + input_len,
276 sizeof(input_buffer) - input_len);
277 if (ret <= 0) {
278 if (!ret)
279 die(_("early EOF"));
280 die_errno(_("read error on input"));
281 }
282 input_len += ret;
283 if (from_stdin)
284 display_throughput(progress, consumed_bytes + input_len);
285 } while (input_len < min);
286 return input_buffer;
287}
288static void use(int bytes)
290{
291 if (bytes > input_len)
292 die(_("used more bytes than were available"));
293 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
294 input_len -= bytes;
295 input_offset += bytes;
296 /* make sure off_t is sufficiently large not to wrap */
298 if (signed_add_overflows(consumed_bytes, bytes))
299 die(_("pack too large for current definition of off_t"));
300 consumed_bytes += bytes;
301 if (max_input_size && consumed_bytes > max_input_size)
302 die(_("pack exceeds maximum allowed size"));
303}
304static const char *open_pack_file(const char *pack_name)
306{
307 if (from_stdin) {
308 input_fd = 0;
309 if (!pack_name) {
310 struct strbuf tmp_file = STRBUF_INIT;
311 output_fd = odb_mkstemp(&tmp_file,
312 "pack/tmp_pack_XXXXXX");
313 pack_name = strbuf_detach(&tmp_file, NULL);
314 } else {
315 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
316 if (output_fd < 0)
317 die_errno(_("unable to create '%s'"), pack_name);
318 }
319 nothread_data.pack_fd = output_fd;
320 } else {
321 input_fd = open(pack_name, O_RDONLY);
322 if (input_fd < 0)
323 die_errno(_("cannot open packfile '%s'"), pack_name);
324 output_fd = -1;
325 nothread_data.pack_fd = input_fd;
326 }
327 git_SHA1_Init(&input_ctx);
328 return pack_name;
329}
330static void parse_pack_header(void)
332{
333 struct pack_header *hdr = fill(sizeof(struct pack_header));
334 /* Header consistency check */
336 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
337 die(_("pack signature mismatch"));
338 if (!pack_version_ok(hdr->hdr_version))
339 die(_("pack version %"PRIu32" unsupported"),
340 ntohl(hdr->hdr_version));
341 nr_objects = ntohl(hdr->hdr_entries);
343 use(sizeof(struct pack_header));
344}
345static NORETURN void bad_object(off_t offset, const char *format,
347 ...) __attribute__((format (printf, 2, 3)));
348static NORETURN void bad_object(off_t offset, const char *format, ...)
350{
351 va_list params;
352 char buf[1024];
353 va_start(params, format);
355 vsnprintf(buf, sizeof(buf), format, params);
356 va_end(params);
357 die(_("pack has bad object at offset %"PRIuMAX": %s"),
358 (uintmax_t)offset, buf);
359}
360static inline struct thread_local *get_thread_data(void)
362{
363#ifndef NO_PTHREADS
364 if (threads_active)
365 return pthread_getspecific(key);
366 assert(!threads_active &&
367 "This should only be reached when all threads are gone");
368#endif
369 return ¬hread_data;
370}
371#ifndef NO_PTHREADS
373static void set_thread_data(struct thread_local *data)
374{
375 if (threads_active)
376 pthread_setspecific(key, data);
377}
378#endif
379static struct base_data *alloc_base_data(void)
381{
382 struct base_data *base = xcalloc(1, sizeof(struct base_data));
383 base->ref_last = -1;
384 base->ofs_last = -1;
385 return base;
386}
387static void free_base_data(struct base_data *c)
389{
390 if (c->data) {
391 FREE_AND_NULL(c->data);
392 get_thread_data()->base_cache_used -= c->size;
393 }
394}
395static void prune_base_data(struct base_data *retain)
397{
398 struct base_data *b;
399 struct thread_local *data = get_thread_data();
400 for (b = data->base_cache;
401 data->base_cache_used > delta_base_cache_limit && b;
402 b = b->child) {
403 if (b->data && b != retain)
404 free_base_data(b);
405 }
406}
407static void link_base_data(struct base_data *base, struct base_data *c)
409{
410 if (base)
411 base->child = c;
412 else
413 get_thread_data()->base_cache = c;
414 c->base = base;
416 c->child = NULL;
417 if (c->data)
418 get_thread_data()->base_cache_used += c->size;
419 prune_base_data(c);
420}
421static void unlink_base_data(struct base_data *c)
423{
424 struct base_data *base = c->base;
425 if (base)
426 base->child = NULL;
427 else
428 get_thread_data()->base_cache = NULL;
429 free_base_data(c);
430}
431static int is_delta_type(enum object_type type)
433{
434 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
435}
436static void *unpack_entry_data(off_t offset, unsigned long size,
438 enum object_type type, unsigned char *sha1)
439{
440 static char fixed_buf[8192];
441 int status;
442 git_zstream stream;
443 void *buf;
444 git_SHA_CTX c;
445 char hdr[32];
446 int hdrlen;
447 if (!is_delta_type(type)) {
449 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), size) + 1;
450 git_SHA1_Init(&c);
451 git_SHA1_Update(&c, hdr, hdrlen);
452 } else
453 sha1 = NULL;
454 if (type == OBJ_BLOB && size > big_file_threshold)
455 buf = fixed_buf;
456 else
457 buf = xmallocz(size);
458 memset(&stream, 0, sizeof(stream));
460 git_inflate_init(&stream);
461 stream.next_out = buf;
462 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
463 do {
465 unsigned char *last_out = stream.next_out;
466 stream.next_in = fill(1);
467 stream.avail_in = input_len;
468 status = git_inflate(&stream, 0);
469 use(input_len - stream.avail_in);
470 if (sha1)
471 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
472 if (buf == fixed_buf) {
473 stream.next_out = buf;
474 stream.avail_out = sizeof(fixed_buf);
475 }
476 } while (status == Z_OK);
477 if (stream.total_out != size || status != Z_STREAM_END)
478 bad_object(offset, _("inflate returned %d"), status);
479 git_inflate_end(&stream);
480 if (sha1)
481 git_SHA1_Final(sha1, &c);
482 return buf == fixed_buf ? NULL : buf;
483}
484static void *unpack_raw_entry(struct object_entry *obj,
486 off_t *ofs_offset,
487 unsigned char *ref_sha1,
488 unsigned char *sha1)
489{
490 unsigned char *p;
491 unsigned long size, c;
492 off_t base_offset;
493 unsigned shift;
494 void *data;
495 obj->idx.offset = consumed_bytes;
497 input_crc32 = crc32(0, NULL, 0);
498 p = fill(1);
500 c = *p;
501 use(1);
502 obj->type = (c >> 4) & 7;
503 size = (c & 15);
504 shift = 4;
505 while (c & 0x80) {
506 p = fill(1);
507 c = *p;
508 use(1);
509 size += (c & 0x7f) << shift;
510 shift += 7;
511 }
512 obj->size = size;
513 switch (obj->type) {
515 case OBJ_REF_DELTA:
516 hashcpy(ref_sha1, fill(20));
517 use(20);
518 break;
519 case OBJ_OFS_DELTA:
520 p = fill(1);
521 c = *p;
522 use(1);
523 base_offset = c & 127;
524 while (c & 128) {
525 base_offset += 1;
526 if (!base_offset || MSB(base_offset, 7))
527 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
528 p = fill(1);
529 c = *p;
530 use(1);
531 base_offset = (base_offset << 7) + (c & 127);
532 }
533 *ofs_offset = obj->idx.offset - base_offset;
534 if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
535 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
536 break;
537 case OBJ_COMMIT:
538 case OBJ_TREE:
539 case OBJ_BLOB:
540 case OBJ_TAG:
541 break;
542 default:
543 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
544 }
545 obj->hdr_size = consumed_bytes - obj->idx.offset;
546 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
548 obj->idx.crc32 = input_crc32;
549 return data;
550}
551static void *unpack_data(struct object_entry *obj,
553 int (*consume)(const unsigned char *, unsigned long, void *),
554 void *cb_data)
555{
556 off_t from = obj[0].idx.offset + obj[0].hdr_size;
557 off_t len = obj[1].idx.offset - from;
558 unsigned char *data, *inbuf;
559 git_zstream stream;
560 int status;
561 data = xmallocz(consume ? 64*1024 : obj->size);
563 inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
564 memset(&stream, 0, sizeof(stream));
566 git_inflate_init(&stream);
567 stream.next_out = data;
568 stream.avail_out = consume ? 64*1024 : obj->size;
569 do {
571 ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
572 n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
573 if (n < 0)
574 die_errno(_("cannot pread pack file"));
575 if (!n)
576 die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
577 "premature end of pack file, %"PRIuMAX" bytes missing",
578 (unsigned int)len),
579 (uintmax_t)len);
580 from += n;
581 len -= n;
582 stream.next_in = inbuf;
583 stream.avail_in = n;
584 if (!consume)
585 status = git_inflate(&stream, 0);
586 else {
587 do {
588 status = git_inflate(&stream, 0);
589 if (consume(data, stream.next_out - data, cb_data)) {
590 free(inbuf);
591 free(data);
592 return NULL;
593 }
594 stream.next_out = data;
595 stream.avail_out = 64*1024;
596 } while (status == Z_OK && stream.avail_in);
597 }
598 } while (len && status == Z_OK && !stream.avail_in);
599 /* This has been inflated OK when first encountered, so... */
601 if (status != Z_STREAM_END || stream.total_out != obj->size)
602 die(_("serious inflate inconsistency"));
603 git_inflate_end(&stream);
605 free(inbuf);
606 if (consume) {
607 FREE_AND_NULL(data);
608 }
609 return data;
610}
611static void *get_data_from_pack(struct object_entry *obj)
613{
614 return unpack_data(obj, NULL, NULL);
615}
616static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
618 enum object_type type1,
619 enum object_type type2)
620{
621 int cmp = type1 - type2;
622 if (cmp)
623 return cmp;
624 return offset1 < offset2 ? -1 :
625 offset1 > offset2 ? 1 :
626 0;
627}
628static int find_ofs_delta(const off_t offset, enum object_type type)
630{
631 int first = 0, last = nr_ofs_deltas;
632 while (first < last) {
634 int next = (first + last) / 2;
635 struct ofs_delta_entry *delta = &ofs_deltas[next];
636 int cmp;
637 cmp = compare_ofs_delta_bases(offset, delta->offset,
639 type, objects[delta->obj_no].type);
640 if (!cmp)
641 return next;
642 if (cmp < 0) {
643 last = next;
644 continue;
645 }
646 first = next+1;
647 }
648 return -first-1;
649}
650static void find_ofs_delta_children(off_t offset,
652 int *first_index, int *last_index,
653 enum object_type type)
654{
655 int first = find_ofs_delta(offset, type);
656 int last = first;
657 int end = nr_ofs_deltas - 1;
658 if (first < 0) {
660 *first_index = 0;
661 *last_index = -1;
662 return;
663 }
664 while (first > 0 && ofs_deltas[first - 1].offset == offset)
665 --first;
666 while (last < end && ofs_deltas[last + 1].offset == offset)
667 ++last;
668 *first_index = first;
669 *last_index = last;
670}
671static int compare_ref_delta_bases(const unsigned char *sha1,
673 const unsigned char *sha2,
674 enum object_type type1,
675 enum object_type type2)
676{
677 int cmp = type1 - type2;
678 if (cmp)
679 return cmp;
680 return hashcmp(sha1, sha2);
681}
682static int find_ref_delta(const unsigned char *sha1, enum object_type type)
684{
685 int first = 0, last = nr_ref_deltas;
686 while (first < last) {
688 int next = (first + last) / 2;
689 struct ref_delta_entry *delta = &ref_deltas[next];
690 int cmp;
691 cmp = compare_ref_delta_bases(sha1, delta->sha1,
693 type, objects[delta->obj_no].type);
694 if (!cmp)
695 return next;
696 if (cmp < 0) {
697 last = next;
698 continue;
699 }
700 first = next+1;
701 }
702 return -first-1;
703}
704static void find_ref_delta_children(const unsigned char *sha1,
706 int *first_index, int *last_index,
707 enum object_type type)
708{
709 int first = find_ref_delta(sha1, type);
710 int last = first;
711 int end = nr_ref_deltas - 1;
712 if (first < 0) {
714 *first_index = 0;
715 *last_index = -1;
716 return;
717 }
718 while (first > 0 && !hashcmp(ref_deltas[first - 1].sha1, sha1))
719 --first;
720 while (last < end && !hashcmp(ref_deltas[last + 1].sha1, sha1))
721 ++last;
722 *first_index = first;
723 *last_index = last;
724}
725struct compare_data {
727 struct object_entry *entry;
728 struct git_istream *st;
729 unsigned char *buf;
730 unsigned long buf_size;
731};
732static int compare_objects(const unsigned char *buf, unsigned long size,
734 void *cb_data)
735{
736 struct compare_data *data = cb_data;
737 if (data->buf_size < size) {
739 free(data->buf);
740 data->buf = xmalloc(size);
741 data->buf_size = size;
742 }
743 while (size) {
745 ssize_t len = read_istream(data->st, data->buf, size);
746 if (len == 0)
747 die(_("SHA1 COLLISION FOUND WITH %s !"),
748 oid_to_hex(&data->entry->idx.oid));
749 if (len < 0)
750 die(_("unable to read %s"),
751 oid_to_hex(&data->entry->idx.oid));
752 if (memcmp(buf, data->buf, len))
753 die(_("SHA1 COLLISION FOUND WITH %s !"),
754 oid_to_hex(&data->entry->idx.oid));
755 size -= len;
756 buf += len;
757 }
758 return 0;
759}
760static int check_collison(struct object_entry *entry)
762{
763 struct compare_data data;
764 enum object_type type;
765 unsigned long size;
766 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
768 return -1;
769 memset(&data, 0, sizeof(data));
771 data.entry = entry;
772 data.st = open_istream(entry->idx.oid.hash, &type, &size, NULL);
773 if (!data.st)
774 return -1;
775 if (size != entry->size || type != entry->type)
776 die(_("SHA1 COLLISION FOUND WITH %s !"),
777 oid_to_hex(&entry->idx.oid));
778 unpack_data(entry, compare_objects, &data);
779 close_istream(data.st);
780 free(data.buf);
781 return 0;
782}
783static void sha1_object(const void *data, struct object_entry *obj_entry,
785 unsigned long size, enum object_type type,
786 const struct object_id *oid)
787{
788 void *new_data = NULL;
789 int collision_test_needed = 0;
790 assert(data || obj_entry);
792 if (startup_info->have_repository) {
794 read_lock();
795 collision_test_needed = has_sha1_file_with_flags(oid->hash, HAS_SHA1_QUICK);
796 read_unlock();
797 }
798 if (collision_test_needed && !data) {
800 read_lock();
801 if (!check_collison(obj_entry))
802 collision_test_needed = 0;
803 read_unlock();
804 }
805 if (collision_test_needed) {
806 void *has_data;
807 enum object_type has_type;
808 unsigned long has_size;
809 read_lock();
810 has_type = sha1_object_info(oid->hash, &has_size);
811 if (has_type < 0)
812 die(_("cannot read existing object info %s"), oid_to_hex(oid));
813 if (has_type != type || has_size != size)
814 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
815 has_data = read_sha1_file(oid->hash, &has_type, &has_size);
816 read_unlock();
817 if (!data)
818 data = new_data = get_data_from_pack(obj_entry);
819 if (!has_data)
820 die(_("cannot read existing object %s"), oid_to_hex(oid));
821 if (size != has_size || type != has_type ||
822 memcmp(data, has_data, size) != 0)
823 die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
824 free(has_data);
825 }
826 if (strict) {
828 read_lock();
829 if (type == OBJ_BLOB) {
830 struct blob *blob = lookup_blob(oid);
831 if (blob)
832 blob->object.flags |= FLAG_CHECKED;
833 else
834 die(_("invalid blob object %s"), oid_to_hex(oid));
835 } else {
836 struct object *obj;
837 int eaten;
838 void *buf = (void *) data;
839 assert(data && "data can only be NULL for large _blobs_");
841 /*
843 * we do not need to free the memory here, as the
844 * buf is deleted by the caller.
845 */
846 obj = parse_object_buffer(oid, type, size, buf,
847 &eaten);
848 if (!obj)
849 die(_("invalid %s"), typename(type));
850 if (do_fsck_object &&
851 fsck_object(obj, buf, size, &fsck_options))
852 die(_("Error in object"));
853 if (fsck_walk(obj, NULL, &fsck_options))
854 die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
855 if (obj->type == OBJ_TREE) {
857 struct tree *item = (struct tree *) obj;
858 item->buffer = NULL;
859 obj->parsed = 0;
860 }
861 if (obj->type == OBJ_COMMIT) {
862 struct commit *commit = (struct commit *) obj;
863 if (detach_commit_buffer(commit, NULL) != data)
864 die("BUG: parse_object_buffer transmogrified our buffer");
865 }
866 obj->flags |= FLAG_CHECKED;
867 }
868 read_unlock();
869 }
870 free(new_data);
872}
873/*
875 * This function is part of find_unresolved_deltas(). There are two
876 * walkers going in the opposite ways.
877 *
878 * The first one in find_unresolved_deltas() traverses down from
879 * parent node to children, deflating nodes along the way. However,
880 * memory for deflated nodes is limited by delta_base_cache_limit, so
881 * at some point parent node's deflated content may be freed.
882 *
883 * The second walker is this function, which goes from current node up
884 * to top parent if necessary to deflate the node. In normal
885 * situation, its parent node would be already deflated, so it just
886 * needs to apply delta.
887 *
888 * In the worst case scenario, parent node is no longer deflated because
889 * we're running out of delta_base_cache_limit; we need to re-deflate
890 * parents, possibly up to the top base.
891 *
892 * All deflated objects here are subject to be freed if we exceed
893 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
894 * just need to make sure the last node is not freed.
895 */
896static void *get_base_data(struct base_data *c)
897{
898 if (!c->data) {
899 struct object_entry *obj = c->obj;
900 struct base_data **delta = NULL;
901 int delta_nr = 0, delta_alloc = 0;
902 while (is_delta_type(c->obj->type) && !c->data) {
904 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
905 delta[delta_nr++] = c;
906 c = c->base;
907 }
908 if (!delta_nr) {
909 c->data = get_data_from_pack(obj);
910 c->size = obj->size;
911 get_thread_data()->base_cache_used += c->size;
912 prune_base_data(c);
913 }
914 for (; delta_nr > 0; delta_nr--) {
915 void *base, *raw;
916 c = delta[delta_nr - 1];
917 obj = c->obj;
918 base = get_base_data(c->base);
919 raw = get_data_from_pack(obj);
920 c->data = patch_delta(
921 base, c->base->size,
922 raw, obj->size,
923 &c->size);
924 free(raw);
925 if (!c->data)
926 bad_object(obj->idx.offset, _("failed to apply delta"));
927 get_thread_data()->base_cache_used += c->size;
928 prune_base_data(c);
929 }
930 free(delta);
931 }
932 return c->data;
933}
934static void resolve_delta(struct object_entry *delta_obj,
936 struct base_data *base, struct base_data *result)
937{
938 void *base_data, *delta_data;
939 if (show_stat) {
941 int i = delta_obj - objects;
942 int j = base->obj - objects;
943 obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
944 deepest_delta_lock();
945 if (deepest_delta < obj_stat[i].delta_depth)
946 deepest_delta = obj_stat[i].delta_depth;
947 deepest_delta_unlock();
948 obj_stat[i].base_object_no = j;
949 }
950 delta_data = get_data_from_pack(delta_obj);
951 base_data = get_base_data(base);
952 result->obj = delta_obj;
953 result->data = patch_delta(base_data, base->size,
954 delta_data, delta_obj->size, &result->size);
955 free(delta_data);
956 if (!result->data)
957 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
958 hash_sha1_file(result->data, result->size,
959 typename(delta_obj->real_type),
960 delta_obj->idx.oid.hash);
961 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
962 &delta_obj->idx.oid);
963 counter_lock();
964 nr_resolved_deltas++;
965 counter_unlock();
966}
967/*
969 * Standard boolean compare-and-swap: atomically check whether "*type" is
970 * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
971 * and return false.
972 */
973static int compare_and_swap_type(signed char *type,
974 enum object_type want,
975 enum object_type set)
976{
977 enum object_type old;
978 type_cas_lock();
980 old = *type;
981 if (old == want)
982 *type = set;
983 type_cas_unlock();
984 return old == want;
986}
987static struct base_data *find_unresolved_deltas_1(struct base_data *base,
989 struct base_data *prev_base)
990{
991 if (base->ref_last == -1 && base->ofs_last == -1) {
992 find_ref_delta_children(base->obj->idx.oid.hash,
993 &base->ref_first, &base->ref_last,
994 OBJ_REF_DELTA);
995 find_ofs_delta_children(base->obj->idx.offset,
997 &base->ofs_first, &base->ofs_last,
998 OBJ_OFS_DELTA);
999 if (base->ref_last == -1 && base->ofs_last == -1) {
1001 free(base->data);
1002 return NULL;
1003 }
1004 link_base_data(prev_base, base);
1006 }
1007 if (base->ref_first <= base->ref_last) {
1009 struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
1010 struct base_data *result = alloc_base_data();
1011 if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
1013 base->obj->real_type))
1014 die("BUG: child->real_type != OBJ_REF_DELTA");
1015 resolve_delta(child, base, result);
1017 if (base->ref_first == base->ref_last && base->ofs_last == -1)
1018 free_base_data(base);
1019 base->ref_first++;
1021 return result;
1022 }
1023 if (base->ofs_first <= base->ofs_last) {
1025 struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
1026 struct base_data *result = alloc_base_data();
1027 assert(child->real_type == OBJ_OFS_DELTA);
1029 child->real_type = base->obj->real_type;
1030 resolve_delta(child, base, result);
1031 if (base->ofs_first == base->ofs_last)
1032 free_base_data(base);
1033 base->ofs_first++;
1035 return result;
1036 }
1037 unlink_base_data(base);
1039 return NULL;
1040}
1041static void find_unresolved_deltas(struct base_data *base)
1043{
1044 struct base_data *new_base, *prev_base = NULL;
1045 for (;;) {
1046 new_base = find_unresolved_deltas_1(base, prev_base);
1047 if (new_base) {
1049 prev_base = base;
1050 base = new_base;
1051 } else {
1052 free(base);
1053 base = prev_base;
1054 if (!base)
1055 return;
1056 prev_base = base->base;
1057 }
1058 }
1059}
1060static int compare_ofs_delta_entry(const void *a, const void *b)
1062{
1063 const struct ofs_delta_entry *delta_a = a;
1064 const struct ofs_delta_entry *delta_b = b;
1065 return delta_a->offset < delta_b->offset ? -1 :
1067 delta_a->offset > delta_b->offset ? 1 :
1068 0;
1069}
1070static int compare_ref_delta_entry(const void *a, const void *b)
1072{
1073 const struct ref_delta_entry *delta_a = a;
1074 const struct ref_delta_entry *delta_b = b;
1075 return hashcmp(delta_a->sha1, delta_b->sha1);
1077}
1078static void resolve_base(struct object_entry *obj)
1080{
1081 struct base_data *base_obj = alloc_base_data();
1082 base_obj->obj = obj;
1083 base_obj->data = NULL;
1084 find_unresolved_deltas(base_obj);
1085}
1086#ifndef NO_PTHREADS
1088static void *threaded_second_pass(void *data)
1089{
1090 set_thread_data(data);
1091 for (;;) {
1092 int i;
1093 counter_lock();
1094 display_progress(progress, nr_resolved_deltas);
1095 counter_unlock();
1096 work_lock();
1097 while (nr_dispatched < nr_objects &&
1098 is_delta_type(objects[nr_dispatched].type))
1099 nr_dispatched++;
1100 if (nr_dispatched >= nr_objects) {
1101 work_unlock();
1102 break;
1103 }
1104 i = nr_dispatched++;
1105 work_unlock();
1106 resolve_base(&objects[i]);
1108 }
1109 return NULL;
1110}
1111#endif
1112/*
1114 * First pass:
1115 * - find locations of all objects;
1116 * - calculate SHA1 of all non-delta objects;
1117 * - remember base (SHA1 or offset) for all deltas.
1118 */
1119static void parse_pack_objects(unsigned char *sha1)
1120{
1121 int i, nr_delays = 0;
1122 struct ofs_delta_entry *ofs_delta = ofs_deltas;
1123 unsigned char ref_delta_sha1[20];
1124 struct stat st;
1125 if (verbose)
1127 progress = start_progress(
1128 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1129 nr_objects);
1130 for (i = 0; i < nr_objects; i++) {
1131 struct object_entry *obj = &objects[i];
1132 void *data = unpack_raw_entry(obj, &ofs_delta->offset,
1133 ref_delta_sha1,
1134 obj->idx.oid.hash);
1135 obj->real_type = obj->type;
1136 if (obj->type == OBJ_OFS_DELTA) {
1137 nr_ofs_deltas++;
1138 ofs_delta->obj_no = i;
1139 ofs_delta++;
1140 } else if (obj->type == OBJ_REF_DELTA) {
1141 ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc);
1142 hashcpy(ref_deltas[nr_ref_deltas].sha1, ref_delta_sha1);
1143 ref_deltas[nr_ref_deltas].obj_no = i;
1144 nr_ref_deltas++;
1145 } else if (!data) {
1146 /* large blobs, check later */
1147 obj->real_type = OBJ_BAD;
1148 nr_delays++;
1149 } else
1150 sha1_object(data, NULL, obj->size, obj->type,
1151 &obj->idx.oid);
1152 free(data);
1153 display_progress(progress, i+1);
1154 }
1155 objects[i].idx.offset = consumed_bytes;
1156 stop_progress(&progress);
1157 /* Check pack integrity */
1159 flush();
1160 git_SHA1_Final(sha1, &input_ctx);
1161 if (hashcmp(fill(20), sha1))
1162 die(_("pack is corrupted (SHA1 mismatch)"));
1163 use(20);
1164 /* If input_fd is a file, we should have reached its end now. */
1166 if (fstat(input_fd, &st))
1167 die_errno(_("cannot fstat packfile"));
1168 if (S_ISREG(st.st_mode) &&
1169 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1170 die(_("pack has junk at the end"));
1171 for (i = 0; i < nr_objects; i++) {
1173 struct object_entry *obj = &objects[i];
1174 if (obj->real_type != OBJ_BAD)
1175 continue;
1176 obj->real_type = obj->type;
1177 sha1_object(NULL, obj, obj->size, obj->type,
1178 &obj->idx.oid);
1179 nr_delays--;
1180 }
1181 if (nr_delays)
1182 die(_("confusion beyond insanity in parse_pack_objects()"));
1183}
1184/*
1186 * Second pass:
1187 * - for all non-delta objects, look if it is used as a base for
1188 * deltas;
1189 * - if used as a base, uncompress the object and apply all deltas,
1190 * recursively checking if the resulting object is used as a base
1191 * for some more deltas.
1192 */
1193static void resolve_deltas(void)
1194{
1195 int i;
1196 if (!nr_ofs_deltas && !nr_ref_deltas)
1198 return;
1199 /* Sort deltas by base SHA1/offset for fast searching */
1201 QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry);
1202 QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry);
1203 if (verbose || show_resolving_progress)
1205 progress = start_progress(_("Resolving deltas"),
1206 nr_ref_deltas + nr_ofs_deltas);
1207#ifndef NO_PTHREADS
1209 nr_dispatched = 0;
1210 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1211 init_thread();
1212 for (i = 0; i < nr_threads; i++) {
1213 int ret = pthread_create(&thread_data[i].thread, NULL,
1214 threaded_second_pass, thread_data + i);
1215 if (ret)
1216 die(_("unable to create thread: %s"),
1217 strerror(ret));
1218 }
1219 for (i = 0; i < nr_threads; i++)
1220 pthread_join(thread_data[i].thread, NULL);
1221 cleanup_thread();
1222 return;
1223 }
1224#endif
1225 for (i = 0; i < nr_objects; i++) {
1227 struct object_entry *obj = &objects[i];
1228 if (is_delta_type(obj->type))
1230 continue;
1231 resolve_base(obj);
1232 display_progress(progress, nr_resolved_deltas);
1233 }
1234}
1235/*
1237 * Third pass:
1238 * - append objects to convert thin pack to full pack if required
1239 * - write the final 20-byte SHA-1
1240 */
1241static void fix_unresolved_deltas(struct sha1file *f);
1242static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1243{
1244 if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) {
1245 stop_progress(&progress);
1246 /* Flush remaining pack final 20-byte SHA1. */
1247 flush();
1248 return;
1249 }
1250 if (fix_thin_pack) {
1252 struct sha1file *f;
1253 unsigned char read_sha1[20], tail_sha1[20];
1254 struct strbuf msg = STRBUF_INIT;
1255 int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas;
1256 int nr_objects_initial = nr_objects;
1257 if (nr_unresolved <= 0)
1258 die(_("confusion beyond insanity"));
1259 REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1);
1260 memset(objects + nr_objects + 1, 0,
1261 nr_unresolved * sizeof(*objects));
1262 f = sha1fd(output_fd, curr_pack);
1263 fix_unresolved_deltas(f);
1264 strbuf_addf(&msg, Q_("completed with %d local object",
1265 "completed with %d local objects",
1266 nr_objects - nr_objects_initial),
1267 nr_objects - nr_objects_initial);
1268 stop_progress_msg(&progress, msg.buf);
1269 strbuf_release(&msg);
1270 sha1close(f, tail_sha1, 0);
1271 hashcpy(read_sha1, pack_sha1);
1272 fixup_pack_header_footer(output_fd, pack_sha1,
1273 curr_pack, nr_objects,
1274 read_sha1, consumed_bytes-20);
1275 if (hashcmp(read_sha1, tail_sha1) != 0)
1276 die(_("Unexpected tail checksum for %s "
1277 "(disk corruption?)"), curr_pack);
1278 }
1279 if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas)
1280 die(Q_("pack has %d unresolved delta",
1281 "pack has %d unresolved deltas",
1282 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas),
1283 nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas);
1284}
1285static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1287{
1288 git_zstream stream;
1289 int status;
1290 unsigned char outbuf[4096];
1291 git_deflate_init(&stream, zlib_compression_level);
1293 stream.next_in = in;
1294 stream.avail_in = size;
1295 do {
1297 stream.next_out = outbuf;
1298 stream.avail_out = sizeof(outbuf);
1299 status = git_deflate(&stream, Z_FINISH);
1300 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1301 } while (status == Z_OK);
1302 if (status != Z_STREAM_END)
1304 die(_("unable to deflate appended object (%d)"), status);
1305 size = stream.total_out;
1306 git_deflate_end(&stream);
1307 return size;
1308}
1309static struct object_entry *append_obj_to_pack(struct sha1file *f,
1311 const unsigned char *sha1, void *buf,
1312 unsigned long size, enum object_type type)
1313{
1314 struct object_entry *obj = &objects[nr_objects++];
1315 unsigned char header[10];
1316 unsigned long s = size;
1317 int n = 0;
1318 unsigned char c = (type << 4) | (s & 15);
1319 s >>= 4;
1320 while (s) {
1321 header[n++] = c | 0x80;
1322 c = s & 0x7f;
1323 s >>= 7;
1324 }
1325 header[n++] = c;
1326 crc32_begin(f);
1327 sha1write(f, header, n);
1328 obj[0].size = size;
1329 obj[0].hdr_size = n;
1330 obj[0].type = type;
1331 obj[0].real_type = type;
1332 obj[1].idx.offset = obj[0].idx.offset + n;
1333 obj[1].idx.offset += write_compressed(f, buf, size);
1334 obj[0].idx.crc32 = crc32_end(f);
1335 sha1flush(f);
1336 hashcpy(obj->idx.oid.hash, sha1);
1337 return obj;
1338}
1339static int delta_pos_compare(const void *_a, const void *_b)
1341{
1342 struct ref_delta_entry *a = *(struct ref_delta_entry **)_a;
1343 struct ref_delta_entry *b = *(struct ref_delta_entry **)_b;
1344 return a->obj_no - b->obj_no;
1345}
1346static void fix_unresolved_deltas(struct sha1file *f)
1348{
1349 struct ref_delta_entry **sorted_by_pos;
1350 int i;
1351 /*
1353 * Since many unresolved deltas may well be themselves base objects
1354 * for more unresolved deltas, we really want to include the
1355 * smallest number of base objects that would cover as much delta
1356 * as possible by picking the
1357 * trunc deltas first, allowing for other deltas to resolve without
1358 * additional base objects. Since most base objects are to be found
1359 * before deltas depending on them, a good heuristic is to start
1360 * resolving deltas in the same order as their position in the pack.
1361 */
1362 ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas);
1363 for (i = 0; i < nr_ref_deltas; i++)
1364 sorted_by_pos[i] = &ref_deltas[i];
1365 QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare);
1366 for (i = 0; i < nr_ref_deltas; i++) {
1368 struct ref_delta_entry *d = sorted_by_pos[i];
1369 enum object_type type;
1370 struct base_data *base_obj = alloc_base_data();
1371 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1373 continue;
1374 base_obj->data = read_sha1_file(d->sha1, &type, &base_obj->size);
1375 if (!base_obj->data)
1376 continue;
1377 if (check_sha1_signature(d->sha1, base_obj->data,
1379 base_obj->size, typename(type)))
1380 die(_("local object %s is corrupt"), sha1_to_hex(d->sha1));
1381 base_obj->obj = append_obj_to_pack(f, d->sha1,
1382 base_obj->data, base_obj->size, type);
1383 find_unresolved_deltas(base_obj);
1384 display_progress(progress, nr_resolved_deltas);
1385 }
1386 free(sorted_by_pos);
1387}
1388static void final(const char *final_pack_name, const char *curr_pack_name,
1390 const char *final_index_name, const char *curr_index_name,
1391 const char *keep_name, const char *keep_msg,
1392 unsigned char *sha1)
1393{
1394 const char *report = "pack";
1395 struct strbuf pack_name = STRBUF_INIT;
1396 struct strbuf index_name = STRBUF_INIT;
1397 struct strbuf keep_name_buf = STRBUF_INIT;
1398 int err;
1399 if (!from_stdin) {
1401 close(input_fd);
1402 } else {
1403 fsync_or_die(output_fd, curr_pack_name);
1404 err = close(output_fd);
1405 if (err)
1406 die_errno(_("error while closing pack file"));
1407 }
1408 if (keep_msg) {
1410 int keep_fd, keep_msg_len = strlen(keep_msg);
1411 if (!keep_name)
1413 keep_name = odb_pack_name(&keep_name_buf, sha1, "keep");
1414 keep_fd = odb_pack_keep(keep_name);
1416 if (keep_fd < 0) {
1417 if (errno != EEXIST)
1418 die_errno(_("cannot write keep file '%s'"),
1419 keep_name);
1420 } else {
1421 if (keep_msg_len > 0) {
1422 write_or_die(keep_fd, keep_msg, keep_msg_len);
1423 write_or_die(keep_fd, "\n", 1);
1424 }
1425 if (close(keep_fd) != 0)
1426 die_errno(_("cannot close written keep file '%s'"),
1427 keep_name);
1428 report = "keep";
1429 }
1430 }
1431 if (final_pack_name != curr_pack_name) {
1433 if (!final_pack_name)
1434 final_pack_name = odb_pack_name(&pack_name, sha1, "pack");
1435 if (finalize_object_file(curr_pack_name, final_pack_name))
1436 die(_("cannot store pack file"));
1437 } else if (from_stdin)
1438 chmod(final_pack_name, 0444);
1439 if (final_index_name != curr_index_name) {
1441 if (!final_index_name)
1442 final_index_name = odb_pack_name(&index_name, sha1, "idx");
1443 if (finalize_object_file(curr_index_name, final_index_name))
1444 die(_("cannot store index file"));
1445 } else
1446 chmod(final_index_name, 0444);
1447 if (!from_stdin) {
1449 printf("%s\n", sha1_to_hex(sha1));
1450 } else {
1451 struct strbuf buf = STRBUF_INIT;
1452 strbuf_addf(&buf, "%s\t%s\n", report, sha1_to_hex(sha1));
1454 write_or_die(1, buf.buf, buf.len);
1455 strbuf_release(&buf);
1456 /*
1458 * Let's just mimic git-unpack-objects here and write
1459 * the last part of the input buffer to stdout.
1460 */
1461 while (input_len) {
1462 err = xwrite(1, input_buffer + input_offset, input_len);
1463 if (err <= 0)
1464 break;
1465 input_len -= err;
1466 input_offset += err;
1467 }
1468 }
1469 strbuf_release(&index_name);
1471 strbuf_release(&pack_name);
1472 strbuf_release(&keep_name_buf);
1473}
1474static int git_index_pack_config(const char *k, const char *v, void *cb)
1476{
1477 struct pack_idx_option *opts = cb;
1478 if (!strcmp(k, "pack.indexversion")) {
1480 opts->version = git_config_int(k, v);
1481 if (opts->version > 2)
1482 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1483 return 0;
1484 }
1485 if (!strcmp(k, "pack.threads")) {
1486 nr_threads = git_config_int(k, v);
1487 if (nr_threads < 0)
1488 die(_("invalid number of threads specified (%d)"),
1489 nr_threads);
1490#ifdef NO_PTHREADS
1491 if (nr_threads != 1)
1492 warning(_("no threads support, ignoring %s"), k);
1493 nr_threads = 1;
1494#endif
1495 return 0;
1496 }
1497 return git_default_config(k, v, cb);
1498}
1499static int cmp_uint32(const void *a_, const void *b_)
1501{
1502 uint32_t a = *((uint32_t *)a_);
1503 uint32_t b = *((uint32_t *)b_);
1504 return (a < b) ? -1 : (a != b);
1506}
1507static void read_v2_anomalous_offsets(struct packed_git *p,
1509 struct pack_idx_option *opts)
1510{
1511 const uint32_t *idx1, *idx2;
1512 uint32_t i;
1513 /* The address of the 4-byte offset table */
1515 idx1 = (((const uint32_t *)p->index_data)
1516 + 2 /* 8-byte header */
1517 + 256 /* fan out */
1518 + 5 * p->num_objects /* 20-byte SHA-1 table */
1519 + p->num_objects /* CRC32 table */
1520 );
1521 /* The address of the 8-byte offset table */
1523 idx2 = idx1 + p->num_objects;
1524 for (i = 0; i < p->num_objects; i++) {
1526 uint32_t off = ntohl(idx1[i]);
1527 if (!(off & 0x80000000))
1528 continue;
1529 off = off & 0x7fffffff;
1530 check_pack_index_ptr(p, &idx2[off * 2]);
1531 if (idx2[off * 2])
1532 continue;
1533 /*
1534 * The real offset is ntohl(idx2[off * 2]) in high 4
1535 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1536 * octets. But idx2[off * 2] is Zero!!!
1537 */
1538 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1539 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1540 }
1541 QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32);
1543}
1544static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1546{
1547 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1548 if (!p)
1550 die(_("Cannot open existing pack file '%s'"), pack_name);
1551 if (open_pack_index(p))
1552 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1553 /* Read the attributes from the existing idx file */
1555 opts->version = p->index_version;
1556 if (opts->version == 2)
1558 read_v2_anomalous_offsets(p, opts);
1559 /*
1561 * Get rid of the idx file as we do not need it anymore.
1562 * NEEDSWORK: extract this bit from free_pack_by_name() in
1563 * sha1_file.c, perhaps? It shouldn't matter very much as we
1564 * know we haven't installed this pack (hence we never have
1565 * read anything from it).
1566 */
1567 close_pack_index(p);
1568 free(p);
1569}
1570static void show_pack_info(int stat_only)
1572{
1573 int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas;
1574 unsigned long *chain_histogram = NULL;
1575 if (deepest_delta)
1577 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1578 for (i = 0; i < nr_objects; i++) {
1580 struct object_entry *obj = &objects[i];
1581 if (is_delta_type(obj->type))
1583 chain_histogram[obj_stat[i].delta_depth - 1]++;
1584 if (stat_only)
1585 continue;
1586 printf("%s %-6s %lu %lu %"PRIuMAX,
1587 oid_to_hex(&obj->idx.oid),
1588 typename(obj->real_type), obj->size,
1589 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1590 (uintmax_t)obj->idx.offset);
1591 if (is_delta_type(obj->type)) {
1592 struct object_entry *bobj = &objects[obj_stat[i].base_object_no];
1593 printf(" %u %s", obj_stat[i].delta_depth,
1594 oid_to_hex(&bobj->idx.oid));
1595 }
1596 putchar('\n');
1597 }
1598 if (baseobjects)
1600 printf_ln(Q_("non delta: %d object",
1601 "non delta: %d objects",
1602 baseobjects),
1603 baseobjects);
1604 for (i = 0; i < deepest_delta; i++) {
1605 if (!chain_histogram[i])
1606 continue;
1607 printf_ln(Q_("chain length = %d: %lu object",
1608 "chain length = %d: %lu objects",
1609 chain_histogram[i]),
1610 i + 1,
1611 chain_histogram[i]);
1612 }
1613}
1614static const char *derive_filename(const char *pack_name, const char *suffix,
1616 struct strbuf *buf)
1617{
1618 size_t len;
1619 if (!strip_suffix(pack_name, ".pack", &len))
1620 die(_("packfile name '%s' does not end with '.pack'"),
1621 pack_name);
1622 strbuf_add(buf, pack_name, len);
1623 strbuf_addstr(buf, suffix);
1624 return buf->buf;
1625}
1626int cmd_index_pack(int argc, const char **argv, const char *prefix)
1628{
1629 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1630 const char *curr_index;
1631 const char *index_name = NULL, *pack_name = NULL;
1632 const char *keep_name = NULL, *keep_msg = NULL;
1633 struct strbuf index_name_buf = STRBUF_INIT,
1634 keep_name_buf = STRBUF_INIT;
1635 struct pack_idx_entry **idx_objects;
1636 struct pack_idx_option opts;
1637 unsigned char pack_sha1[20];
1638 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1639 int report_end_of_input = 0;
1640 if (argc == 2 && !strcmp(argv[1], "-h"))
1642 usage(index_pack_usage);
1643 check_replace_refs = 0;
1645 fsck_options.walk = mark_link;
1646 reset_pack_idx_option(&opts);
1648 git_config(git_index_pack_config, &opts);
1649 if (prefix && chdir(prefix))
1650 die(_("Cannot come back to cwd"));
1651 for (i = 1; i < argc; i++) {
1653 const char *arg = argv[i];
1654 if (*arg == '-') {
1656 if (!strcmp(arg, "--stdin")) {
1657 from_stdin = 1;
1658 } else if (!strcmp(arg, "--fix-thin")) {
1659 fix_thin_pack = 1;
1660 } else if (!strcmp(arg, "--strict")) {
1661 strict = 1;
1662 do_fsck_object = 1;
1663 } else if (skip_prefix(arg, "--strict=", &arg)) {
1664 strict = 1;
1665 do_fsck_object = 1;
1666 fsck_set_msg_types(&fsck_options, arg);
1667 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1668 strict = 1;
1669 check_self_contained_and_connected = 1;
1670 } else if (!strcmp(arg, "--verify")) {
1671 verify = 1;
1672 } else if (!strcmp(arg, "--verify-stat")) {
1673 verify = 1;
1674 show_stat = 1;
1675 } else if (!strcmp(arg, "--verify-stat-only")) {
1676 verify = 1;
1677 show_stat = 1;
1678 stat_only = 1;
1679 } else if (!strcmp(arg, "--keep")) {
1680 keep_msg = "";
1681 } else if (starts_with(arg, "--keep=")) {
1682 keep_msg = arg + 7;
1683 } else if (starts_with(arg, "--threads=")) {
1684 char *end;
1685 nr_threads = strtoul(arg+10, &end, 0);
1686 if (!arg[10] || *end || nr_threads < 0)
1687 usage(index_pack_usage);
1688#ifdef NO_PTHREADS
1689 if (nr_threads != 1)
1690 warning(_("no threads support, "
1691 "ignoring %s"), arg);
1692 nr_threads = 1;
1693#endif
1694 } else if (starts_with(arg, "--pack_header=")) {
1695 struct pack_header *hdr;
1696 char *c;
1697 hdr = (struct pack_header *)input_buffer;
1699 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1700 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1701 if (*c != ',')
1702 die(_("bad %s"), arg);
1703 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1704 if (*c)
1705 die(_("bad %s"), arg);
1706 input_len = sizeof(*hdr);
1707 } else if (!strcmp(arg, "-v")) {
1708 verbose = 1;
1709 } else if (!strcmp(arg, "--show-resolving-progress")) {
1710 show_resolving_progress = 1;
1711 } else if (!strcmp(arg, "--report-end-of-input")) {
1712 report_end_of_input = 1;
1713 } else if (!strcmp(arg, "-o")) {
1714 if (index_name || (i+1) >= argc)
1715 usage(index_pack_usage);
1716 index_name = argv[++i];
1717 } else if (starts_with(arg, "--index-version=")) {
1718 char *c;
1719 opts.version = strtoul(arg + 16, &c, 10);
1720 if (opts.version > 2)
1721 die(_("bad %s"), arg);
1722 if (*c == ',')
1723 opts.off32_limit = strtoul(c+1, &c, 0);
1724 if (*c || opts.off32_limit & 0x80000000)
1725 die(_("bad %s"), arg);
1726 } else if (skip_prefix(arg, "--max-input-size=", &arg)) {
1727 max_input_size = strtoumax(arg, NULL, 10);
1728 } else
1729 usage(index_pack_usage);
1730 continue;
1731 }
1732 if (pack_name)
1734 usage(index_pack_usage);
1735 pack_name = arg;
1736 }
1737 if (!pack_name && !from_stdin)
1739 usage(index_pack_usage);
1740 if (fix_thin_pack && !from_stdin)
1741 die(_("--fix-thin cannot be used without --stdin"));
1742 if (from_stdin && !startup_info->have_repository)
1743 die(_("--stdin requires a git repository"));
1744 if (!index_name && pack_name)
1745 index_name = derive_filename(pack_name, ".idx", &index_name_buf);
1746 if (keep_msg && !keep_name && pack_name)
1747 keep_name = derive_filename(pack_name, ".keep", &keep_name_buf);
1748 if (verify) {
1750 if (!index_name)
1751 die(_("--verify with no packfile name given"));
1752 read_idx_option(&opts, index_name);
1753 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1754 }
1755 if (strict)
1756 opts.flags |= WRITE_IDX_STRICT;
1757#ifndef NO_PTHREADS
1759 if (!nr_threads) {
1760 nr_threads = online_cpus();
1761 /* An experiment showed that more threads does not mean faster */
1762 if (nr_threads > 3)
1763 nr_threads = 3;
1764 }
1765#endif
1766 curr_pack = open_pack_file(pack_name);
1768 parse_pack_header();
1769 objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry));
1770 if (show_stat)
1771 obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat));
1772 ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry));
1773 parse_pack_objects(pack_sha1);
1774 if (report_end_of_input)
1775 write_in_full(2, "\0", 1);
1776 resolve_deltas();
1777 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1778 free(ofs_deltas);
1779 free(ref_deltas);
1780 if (strict)
1781 foreign_nr = check_objects();
1782 if (show_stat)
1784 show_pack_info(stat_only);
1785 ALLOC_ARRAY(idx_objects, nr_objects);
1787 for (i = 0; i < nr_objects; i++)
1788 idx_objects[i] = &objects[i].idx;
1789 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1790 free(idx_objects);
1791 if (!verify)
1793 final(pack_name, curr_pack,
1794 index_name, curr_index,
1795 keep_name, keep_msg,
1796 pack_sha1);
1797 else
1798 close(input_fd);
1799 free(objects);
1800 strbuf_release(&index_name_buf);
1801 strbuf_release(&keep_name_buf);
1802 if (pack_name == NULL)
1803 free((void *) curr_pack);
1804 if (index_name == NULL)
1805 free((void *) curr_index);
1806 /*
1808 * Let the caller know this pack is not self contained
1809 */
1810 if (check_self_contained_and_connected && foreign_nr)
1811 return 1;
1812 return 0;
1814}