Merge branch 'jk/index-pack-report-missing' into maint
[git/git.git] / builtin / index-pack.c
1 #include "builtin.h"
2 #include "delta.h"
3 #include "pack.h"
4 #include "csum-file.h"
5 #include "blob.h"
6 #include "commit.h"
7 #include "tag.h"
8 #include "tree.h"
9 #include "progress.h"
10 #include "fsck.h"
11 #include "exec_cmd.h"
12 #include "streaming.h"
13 #include "thread-utils.h"
14
15 static const char index_pack_usage[] =
16 "git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
17
18 struct object_entry {
19 struct pack_idx_entry idx;
20 unsigned long size;
21 unsigned int hdr_size;
22 enum object_type type;
23 enum object_type real_type;
24 unsigned delta_depth;
25 int base_object_no;
26 };
27
28 union delta_base {
29 unsigned char sha1[20];
30 off_t offset;
31 };
32
33 struct base_data {
34 struct base_data *base;
35 struct base_data *child;
36 struct object_entry *obj;
37 void *data;
38 unsigned long size;
39 int ref_first, ref_last;
40 int ofs_first, ofs_last;
41 };
42
43 struct thread_local {
44 #ifndef NO_PTHREADS
45 pthread_t thread;
46 #endif
47 struct base_data *base_cache;
48 size_t base_cache_used;
49 int pack_fd;
50 };
51
52 /*
53 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
54 * to memcmp() only the first 20 bytes.
55 */
56 #define UNION_BASE_SZ 20
57
58 #define FLAG_LINK (1u<<20)
59 #define FLAG_CHECKED (1u<<21)
60
61 struct delta_entry {
62 union delta_base base;
63 int obj_no;
64 };
65
66 static struct object_entry *objects;
67 static struct delta_entry *deltas;
68 static struct thread_local nothread_data;
69 static int nr_objects;
70 static int nr_deltas;
71 static int nr_resolved_deltas;
72 static int nr_threads;
73
74 static int from_stdin;
75 static int strict;
76 static int do_fsck_object;
77 static int verbose;
78 static int show_stat;
79 static int check_self_contained_and_connected;
80
81 static struct progress *progress;
82
83 /* We always read in 4kB chunks. */
84 static unsigned char input_buffer[4096];
85 static unsigned int input_offset, input_len;
86 static off_t consumed_bytes;
87 static unsigned deepest_delta;
88 static git_SHA_CTX input_ctx;
89 static uint32_t input_crc32;
90 static int input_fd, output_fd;
91 static const char *curr_pack;
92
93 #ifndef NO_PTHREADS
94
95 static struct thread_local *thread_data;
96 static int nr_dispatched;
97 static int threads_active;
98
99 static pthread_mutex_t read_mutex;
100 #define read_lock() lock_mutex(&read_mutex)
101 #define read_unlock() unlock_mutex(&read_mutex)
102
103 static pthread_mutex_t counter_mutex;
104 #define counter_lock() lock_mutex(&counter_mutex)
105 #define counter_unlock() unlock_mutex(&counter_mutex)
106
107 static pthread_mutex_t work_mutex;
108 #define work_lock() lock_mutex(&work_mutex)
109 #define work_unlock() unlock_mutex(&work_mutex)
110
111 static pthread_mutex_t deepest_delta_mutex;
112 #define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
113 #define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
114
115 static pthread_key_t key;
116
117 static inline void lock_mutex(pthread_mutex_t *mutex)
118 {
119 if (threads_active)
120 pthread_mutex_lock(mutex);
121 }
122
123 static inline void unlock_mutex(pthread_mutex_t *mutex)
124 {
125 if (threads_active)
126 pthread_mutex_unlock(mutex);
127 }
128
129 /*
130 * Mutex and conditional variable can't be statically-initialized on Windows.
131 */
132 static void init_thread(void)
133 {
134 int i;
135 init_recursive_mutex(&read_mutex);
136 pthread_mutex_init(&counter_mutex, NULL);
137 pthread_mutex_init(&work_mutex, NULL);
138 if (show_stat)
139 pthread_mutex_init(&deepest_delta_mutex, NULL);
140 pthread_key_create(&key, NULL);
141 thread_data = xcalloc(nr_threads, sizeof(*thread_data));
142 for (i = 0; i < nr_threads; i++) {
143 thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
144 if (thread_data[i].pack_fd == -1)
145 die_errno(_("unable to open %s"), curr_pack);
146 }
147
148 threads_active = 1;
149 }
150
151 static void cleanup_thread(void)
152 {
153 int i;
154 if (!threads_active)
155 return;
156 threads_active = 0;
157 pthread_mutex_destroy(&read_mutex);
158 pthread_mutex_destroy(&counter_mutex);
159 pthread_mutex_destroy(&work_mutex);
160 if (show_stat)
161 pthread_mutex_destroy(&deepest_delta_mutex);
162 for (i = 0; i < nr_threads; i++)
163 close(thread_data[i].pack_fd);
164 pthread_key_delete(key);
165 free(thread_data);
166 }
167
168 #else
169
170 #define read_lock()
171 #define read_unlock()
172
173 #define counter_lock()
174 #define counter_unlock()
175
176 #define work_lock()
177 #define work_unlock()
178
179 #define deepest_delta_lock()
180 #define deepest_delta_unlock()
181
182 #endif
183
184
185 static int mark_link(struct object *obj, int type, void *data)
186 {
187 if (!obj)
188 return -1;
189
190 if (type != OBJ_ANY && obj->type != type)
191 die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
192
193 obj->flags |= FLAG_LINK;
194 return 0;
195 }
196
197 /* The content of each linked object must have been checked
198 or it must be already present in the object database */
199 static unsigned check_object(struct object *obj)
200 {
201 if (!obj)
202 return 0;
203
204 if (!(obj->flags & FLAG_LINK))
205 return 0;
206
207 if (!(obj->flags & FLAG_CHECKED)) {
208 unsigned long size;
209 int type = sha1_object_info(obj->sha1, &size);
210 if (type <= 0)
211 die(_("did not receive expected object %s"),
212 sha1_to_hex(obj->sha1));
213 if (type != obj->type)
214 die(_("object %s: expected type %s, found %s"),
215 sha1_to_hex(obj->sha1),
216 typename(obj->type), typename(type));
217 obj->flags |= FLAG_CHECKED;
218 return 1;
219 }
220
221 return 0;
222 }
223
224 static unsigned check_objects(void)
225 {
226 unsigned i, max, foreign_nr = 0;
227
228 max = get_max_object_index();
229 for (i = 0; i < max; i++)
230 foreign_nr += check_object(get_indexed_object(i));
231 return foreign_nr;
232 }
233
234
235 /* Discard current buffer used content. */
236 static void flush(void)
237 {
238 if (input_offset) {
239 if (output_fd >= 0)
240 write_or_die(output_fd, input_buffer, input_offset);
241 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
242 memmove(input_buffer, input_buffer + input_offset, input_len);
243 input_offset = 0;
244 }
245 }
246
247 /*
248 * Make sure at least "min" bytes are available in the buffer, and
249 * return the pointer to the buffer.
250 */
251 static void *fill(int min)
252 {
253 if (min <= input_len)
254 return input_buffer + input_offset;
255 if (min > sizeof(input_buffer))
256 die(Q_("cannot fill %d byte",
257 "cannot fill %d bytes",
258 min),
259 min);
260 flush();
261 do {
262 ssize_t ret = xread(input_fd, input_buffer + input_len,
263 sizeof(input_buffer) - input_len);
264 if (ret <= 0) {
265 if (!ret)
266 die(_("early EOF"));
267 die_errno(_("read error on input"));
268 }
269 input_len += ret;
270 if (from_stdin)
271 display_throughput(progress, consumed_bytes + input_len);
272 } while (input_len < min);
273 return input_buffer;
274 }
275
276 static void use(int bytes)
277 {
278 if (bytes > input_len)
279 die(_("used more bytes than were available"));
280 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
281 input_len -= bytes;
282 input_offset += bytes;
283
284 /* make sure off_t is sufficiently large not to wrap */
285 if (signed_add_overflows(consumed_bytes, bytes))
286 die(_("pack too large for current definition of off_t"));
287 consumed_bytes += bytes;
288 }
289
290 static const char *open_pack_file(const char *pack_name)
291 {
292 if (from_stdin) {
293 input_fd = 0;
294 if (!pack_name) {
295 static char tmp_file[PATH_MAX];
296 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
297 "pack/tmp_pack_XXXXXX");
298 pack_name = xstrdup(tmp_file);
299 } else
300 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
301 if (output_fd < 0)
302 die_errno(_("unable to create '%s'"), pack_name);
303 nothread_data.pack_fd = output_fd;
304 } else {
305 input_fd = open(pack_name, O_RDONLY);
306 if (input_fd < 0)
307 die_errno(_("cannot open packfile '%s'"), pack_name);
308 output_fd = -1;
309 nothread_data.pack_fd = input_fd;
310 }
311 git_SHA1_Init(&input_ctx);
312 return pack_name;
313 }
314
315 static void parse_pack_header(void)
316 {
317 struct pack_header *hdr = fill(sizeof(struct pack_header));
318
319 /* Header consistency check */
320 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
321 die(_("pack signature mismatch"));
322 if (!pack_version_ok(hdr->hdr_version))
323 die(_("pack version %"PRIu32" unsupported"),
324 ntohl(hdr->hdr_version));
325
326 nr_objects = ntohl(hdr->hdr_entries);
327 use(sizeof(struct pack_header));
328 }
329
330 static NORETURN void bad_object(unsigned long offset, const char *format,
331 ...) __attribute__((format (printf, 2, 3)));
332
333 static NORETURN void bad_object(unsigned long offset, const char *format, ...)
334 {
335 va_list params;
336 char buf[1024];
337
338 va_start(params, format);
339 vsnprintf(buf, sizeof(buf), format, params);
340 va_end(params);
341 die(_("pack has bad object at offset %lu: %s"), offset, buf);
342 }
343
344 static inline struct thread_local *get_thread_data(void)
345 {
346 #ifndef NO_PTHREADS
347 if (threads_active)
348 return pthread_getspecific(key);
349 assert(!threads_active &&
350 "This should only be reached when all threads are gone");
351 #endif
352 return &nothread_data;
353 }
354
355 #ifndef NO_PTHREADS
356 static void set_thread_data(struct thread_local *data)
357 {
358 if (threads_active)
359 pthread_setspecific(key, data);
360 }
361 #endif
362
363 static struct base_data *alloc_base_data(void)
364 {
365 struct base_data *base = xmalloc(sizeof(struct base_data));
366 memset(base, 0, sizeof(*base));
367 base->ref_last = -1;
368 base->ofs_last = -1;
369 return base;
370 }
371
372 static void free_base_data(struct base_data *c)
373 {
374 if (c->data) {
375 free(c->data);
376 c->data = NULL;
377 get_thread_data()->base_cache_used -= c->size;
378 }
379 }
380
381 static void prune_base_data(struct base_data *retain)
382 {
383 struct base_data *b;
384 struct thread_local *data = get_thread_data();
385 for (b = data->base_cache;
386 data->base_cache_used > delta_base_cache_limit && b;
387 b = b->child) {
388 if (b->data && b != retain)
389 free_base_data(b);
390 }
391 }
392
393 static void link_base_data(struct base_data *base, struct base_data *c)
394 {
395 if (base)
396 base->child = c;
397 else
398 get_thread_data()->base_cache = c;
399
400 c->base = base;
401 c->child = NULL;
402 if (c->data)
403 get_thread_data()->base_cache_used += c->size;
404 prune_base_data(c);
405 }
406
407 static void unlink_base_data(struct base_data *c)
408 {
409 struct base_data *base = c->base;
410 if (base)
411 base->child = NULL;
412 else
413 get_thread_data()->base_cache = NULL;
414 free_base_data(c);
415 }
416
417 static int is_delta_type(enum object_type type)
418 {
419 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
420 }
421
422 static void *unpack_entry_data(unsigned long offset, unsigned long size,
423 enum object_type type, unsigned char *sha1)
424 {
425 static char fixed_buf[8192];
426 int status;
427 git_zstream stream;
428 void *buf;
429 git_SHA_CTX c;
430 char hdr[32];
431 int hdrlen;
432
433 if (!is_delta_type(type)) {
434 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
435 git_SHA1_Init(&c);
436 git_SHA1_Update(&c, hdr, hdrlen);
437 } else
438 sha1 = NULL;
439 if (type == OBJ_BLOB && size > big_file_threshold)
440 buf = fixed_buf;
441 else
442 buf = xmalloc(size);
443
444 memset(&stream, 0, sizeof(stream));
445 git_inflate_init(&stream);
446 stream.next_out = buf;
447 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
448
449 do {
450 unsigned char *last_out = stream.next_out;
451 stream.next_in = fill(1);
452 stream.avail_in = input_len;
453 status = git_inflate(&stream, 0);
454 use(input_len - stream.avail_in);
455 if (sha1)
456 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
457 if (buf == fixed_buf) {
458 stream.next_out = buf;
459 stream.avail_out = sizeof(fixed_buf);
460 }
461 } while (status == Z_OK);
462 if (stream.total_out != size || status != Z_STREAM_END)
463 bad_object(offset, _("inflate returned %d"), status);
464 git_inflate_end(&stream);
465 if (sha1)
466 git_SHA1_Final(sha1, &c);
467 return buf == fixed_buf ? NULL : buf;
468 }
469
470 static void *unpack_raw_entry(struct object_entry *obj,
471 union delta_base *delta_base,
472 unsigned char *sha1)
473 {
474 unsigned char *p;
475 unsigned long size, c;
476 off_t base_offset;
477 unsigned shift;
478 void *data;
479
480 obj->idx.offset = consumed_bytes;
481 input_crc32 = crc32(0, NULL, 0);
482
483 p = fill(1);
484 c = *p;
485 use(1);
486 obj->type = (c >> 4) & 7;
487 size = (c & 15);
488 shift = 4;
489 while (c & 0x80) {
490 p = fill(1);
491 c = *p;
492 use(1);
493 size += (c & 0x7f) << shift;
494 shift += 7;
495 }
496 obj->size = size;
497
498 switch (obj->type) {
499 case OBJ_REF_DELTA:
500 hashcpy(delta_base->sha1, fill(20));
501 use(20);
502 break;
503 case OBJ_OFS_DELTA:
504 memset(delta_base, 0, sizeof(*delta_base));
505 p = fill(1);
506 c = *p;
507 use(1);
508 base_offset = c & 127;
509 while (c & 128) {
510 base_offset += 1;
511 if (!base_offset || MSB(base_offset, 7))
512 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
513 p = fill(1);
514 c = *p;
515 use(1);
516 base_offset = (base_offset << 7) + (c & 127);
517 }
518 delta_base->offset = obj->idx.offset - base_offset;
519 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
520 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
521 break;
522 case OBJ_COMMIT:
523 case OBJ_TREE:
524 case OBJ_BLOB:
525 case OBJ_TAG:
526 break;
527 default:
528 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
529 }
530 obj->hdr_size = consumed_bytes - obj->idx.offset;
531
532 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
533 obj->idx.crc32 = input_crc32;
534 return data;
535 }
536
537 static void *unpack_data(struct object_entry *obj,
538 int (*consume)(const unsigned char *, unsigned long, void *),
539 void *cb_data)
540 {
541 off_t from = obj[0].idx.offset + obj[0].hdr_size;
542 unsigned long len = obj[1].idx.offset - from;
543 unsigned char *data, *inbuf;
544 git_zstream stream;
545 int status;
546
547 data = xmalloc(consume ? 64*1024 : obj->size);
548 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
549
550 memset(&stream, 0, sizeof(stream));
551 git_inflate_init(&stream);
552 stream.next_out = data;
553 stream.avail_out = consume ? 64*1024 : obj->size;
554
555 do {
556 ssize_t n = (len < 64*1024) ? len : 64*1024;
557 n = pread(get_thread_data()->pack_fd, inbuf, n, from);
558 if (n < 0)
559 die_errno(_("cannot pread pack file"));
560 if (!n)
561 die(Q_("premature end of pack file, %lu byte missing",
562 "premature end of pack file, %lu bytes missing",
563 len),
564 len);
565 from += n;
566 len -= n;
567 stream.next_in = inbuf;
568 stream.avail_in = n;
569 if (!consume)
570 status = git_inflate(&stream, 0);
571 else {
572 do {
573 status = git_inflate(&stream, 0);
574 if (consume(data, stream.next_out - data, cb_data)) {
575 free(inbuf);
576 free(data);
577 return NULL;
578 }
579 stream.next_out = data;
580 stream.avail_out = 64*1024;
581 } while (status == Z_OK && stream.avail_in);
582 }
583 } while (len && status == Z_OK && !stream.avail_in);
584
585 /* This has been inflated OK when first encountered, so... */
586 if (status != Z_STREAM_END || stream.total_out != obj->size)
587 die(_("serious inflate inconsistency"));
588
589 git_inflate_end(&stream);
590 free(inbuf);
591 if (consume) {
592 free(data);
593 data = NULL;
594 }
595 return data;
596 }
597
598 static void *get_data_from_pack(struct object_entry *obj)
599 {
600 return unpack_data(obj, NULL, NULL);
601 }
602
603 static int compare_delta_bases(const union delta_base *base1,
604 const union delta_base *base2,
605 enum object_type type1,
606 enum object_type type2)
607 {
608 int cmp = type1 - type2;
609 if (cmp)
610 return cmp;
611 return memcmp(base1, base2, UNION_BASE_SZ);
612 }
613
614 static int find_delta(const union delta_base *base, enum object_type type)
615 {
616 int first = 0, last = nr_deltas;
617
618 while (first < last) {
619 int next = (first + last) / 2;
620 struct delta_entry *delta = &deltas[next];
621 int cmp;
622
623 cmp = compare_delta_bases(base, &delta->base,
624 type, objects[delta->obj_no].type);
625 if (!cmp)
626 return next;
627 if (cmp < 0) {
628 last = next;
629 continue;
630 }
631 first = next+1;
632 }
633 return -first-1;
634 }
635
636 static void find_delta_children(const union delta_base *base,
637 int *first_index, int *last_index,
638 enum object_type type)
639 {
640 int first = find_delta(base, type);
641 int last = first;
642 int end = nr_deltas - 1;
643
644 if (first < 0) {
645 *first_index = 0;
646 *last_index = -1;
647 return;
648 }
649 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
650 --first;
651 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
652 ++last;
653 *first_index = first;
654 *last_index = last;
655 }
656
657 struct compare_data {
658 struct object_entry *entry;
659 struct git_istream *st;
660 unsigned char *buf;
661 unsigned long buf_size;
662 };
663
664 static int compare_objects(const unsigned char *buf, unsigned long size,
665 void *cb_data)
666 {
667 struct compare_data *data = cb_data;
668
669 if (data->buf_size < size) {
670 free(data->buf);
671 data->buf = xmalloc(size);
672 data->buf_size = size;
673 }
674
675 while (size) {
676 ssize_t len = read_istream(data->st, data->buf, size);
677 if (len == 0)
678 die(_("SHA1 COLLISION FOUND WITH %s !"),
679 sha1_to_hex(data->entry->idx.sha1));
680 if (len < 0)
681 die(_("unable to read %s"),
682 sha1_to_hex(data->entry->idx.sha1));
683 if (memcmp(buf, data->buf, len))
684 die(_("SHA1 COLLISION FOUND WITH %s !"),
685 sha1_to_hex(data->entry->idx.sha1));
686 size -= len;
687 buf += len;
688 }
689 return 0;
690 }
691
692 static int check_collison(struct object_entry *entry)
693 {
694 struct compare_data data;
695 enum object_type type;
696 unsigned long size;
697
698 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
699 return -1;
700
701 memset(&data, 0, sizeof(data));
702 data.entry = entry;
703 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
704 if (!data.st)
705 return -1;
706 if (size != entry->size || type != entry->type)
707 die(_("SHA1 COLLISION FOUND WITH %s !"),
708 sha1_to_hex(entry->idx.sha1));
709 unpack_data(entry, compare_objects, &data);
710 close_istream(data.st);
711 free(data.buf);
712 return 0;
713 }
714
715 static void sha1_object(const void *data, struct object_entry *obj_entry,
716 unsigned long size, enum object_type type,
717 const unsigned char *sha1)
718 {
719 void *new_data = NULL;
720 int collision_test_needed;
721
722 assert(data || obj_entry);
723
724 read_lock();
725 collision_test_needed = has_sha1_file(sha1);
726 read_unlock();
727
728 if (collision_test_needed && !data) {
729 read_lock();
730 if (!check_collison(obj_entry))
731 collision_test_needed = 0;
732 read_unlock();
733 }
734 if (collision_test_needed) {
735 void *has_data;
736 enum object_type has_type;
737 unsigned long has_size;
738 read_lock();
739 has_type = sha1_object_info(sha1, &has_size);
740 if (has_type != type || has_size != size)
741 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
742 has_data = read_sha1_file(sha1, &has_type, &has_size);
743 read_unlock();
744 if (!data)
745 data = new_data = get_data_from_pack(obj_entry);
746 if (!has_data)
747 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
748 if (size != has_size || type != has_type ||
749 memcmp(data, has_data, size) != 0)
750 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
751 free(has_data);
752 }
753
754 if (strict) {
755 read_lock();
756 if (type == OBJ_BLOB) {
757 struct blob *blob = lookup_blob(sha1);
758 if (blob)
759 blob->object.flags |= FLAG_CHECKED;
760 else
761 die(_("invalid blob object %s"), sha1_to_hex(sha1));
762 } else {
763 struct object *obj;
764 int eaten;
765 void *buf = (void *) data;
766
767 assert(data && "data can only be NULL for large _blobs_");
768
769 /*
770 * we do not need to free the memory here, as the
771 * buf is deleted by the caller.
772 */
773 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
774 if (!obj)
775 die(_("invalid %s"), typename(type));
776 if (do_fsck_object &&
777 fsck_object(obj, 1, fsck_error_function))
778 die(_("Error in object"));
779 if (fsck_walk(obj, mark_link, NULL))
780 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
781
782 if (obj->type == OBJ_TREE) {
783 struct tree *item = (struct tree *) obj;
784 item->buffer = NULL;
785 obj->parsed = 0;
786 }
787 if (obj->type == OBJ_COMMIT) {
788 struct commit *commit = (struct commit *) obj;
789 commit->buffer = NULL;
790 }
791 obj->flags |= FLAG_CHECKED;
792 }
793 read_unlock();
794 }
795
796 free(new_data);
797 }
798
799 /*
800 * This function is part of find_unresolved_deltas(). There are two
801 * walkers going in the opposite ways.
802 *
803 * The first one in find_unresolved_deltas() traverses down from
804 * parent node to children, deflating nodes along the way. However,
805 * memory for deflated nodes is limited by delta_base_cache_limit, so
806 * at some point parent node's deflated content may be freed.
807 *
808 * The second walker is this function, which goes from current node up
809 * to top parent if necessary to deflate the node. In normal
810 * situation, its parent node would be already deflated, so it just
811 * needs to apply delta.
812 *
813 * In the worst case scenario, parent node is no longer deflated because
814 * we're running out of delta_base_cache_limit; we need to re-deflate
815 * parents, possibly up to the top base.
816 *
817 * All deflated objects here are subject to be freed if we exceed
818 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
819 * just need to make sure the last node is not freed.
820 */
821 static void *get_base_data(struct base_data *c)
822 {
823 if (!c->data) {
824 struct object_entry *obj = c->obj;
825 struct base_data **delta = NULL;
826 int delta_nr = 0, delta_alloc = 0;
827
828 while (is_delta_type(c->obj->type) && !c->data) {
829 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
830 delta[delta_nr++] = c;
831 c = c->base;
832 }
833 if (!delta_nr) {
834 c->data = get_data_from_pack(obj);
835 c->size = obj->size;
836 get_thread_data()->base_cache_used += c->size;
837 prune_base_data(c);
838 }
839 for (; delta_nr > 0; delta_nr--) {
840 void *base, *raw;
841 c = delta[delta_nr - 1];
842 obj = c->obj;
843 base = get_base_data(c->base);
844 raw = get_data_from_pack(obj);
845 c->data = patch_delta(
846 base, c->base->size,
847 raw, obj->size,
848 &c->size);
849 free(raw);
850 if (!c->data)
851 bad_object(obj->idx.offset, _("failed to apply delta"));
852 get_thread_data()->base_cache_used += c->size;
853 prune_base_data(c);
854 }
855 free(delta);
856 }
857 return c->data;
858 }
859
860 static void resolve_delta(struct object_entry *delta_obj,
861 struct base_data *base, struct base_data *result)
862 {
863 void *base_data, *delta_data;
864
865 delta_obj->real_type = base->obj->real_type;
866 if (show_stat) {
867 delta_obj->delta_depth = base->obj->delta_depth + 1;
868 deepest_delta_lock();
869 if (deepest_delta < delta_obj->delta_depth)
870 deepest_delta = delta_obj->delta_depth;
871 deepest_delta_unlock();
872 }
873 delta_obj->base_object_no = base->obj - objects;
874 delta_data = get_data_from_pack(delta_obj);
875 base_data = get_base_data(base);
876 result->obj = delta_obj;
877 result->data = patch_delta(base_data, base->size,
878 delta_data, delta_obj->size, &result->size);
879 free(delta_data);
880 if (!result->data)
881 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
882 hash_sha1_file(result->data, result->size,
883 typename(delta_obj->real_type), delta_obj->idx.sha1);
884 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
885 delta_obj->idx.sha1);
886 counter_lock();
887 nr_resolved_deltas++;
888 counter_unlock();
889 }
890
891 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
892 struct base_data *prev_base)
893 {
894 if (base->ref_last == -1 && base->ofs_last == -1) {
895 union delta_base base_spec;
896
897 hashcpy(base_spec.sha1, base->obj->idx.sha1);
898 find_delta_children(&base_spec,
899 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
900
901 memset(&base_spec, 0, sizeof(base_spec));
902 base_spec.offset = base->obj->idx.offset;
903 find_delta_children(&base_spec,
904 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
905
906 if (base->ref_last == -1 && base->ofs_last == -1) {
907 free(base->data);
908 return NULL;
909 }
910
911 link_base_data(prev_base, base);
912 }
913
914 if (base->ref_first <= base->ref_last) {
915 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
916 struct base_data *result = alloc_base_data();
917
918 assert(child->real_type == OBJ_REF_DELTA);
919 resolve_delta(child, base, result);
920 if (base->ref_first == base->ref_last && base->ofs_last == -1)
921 free_base_data(base);
922
923 base->ref_first++;
924 return result;
925 }
926
927 if (base->ofs_first <= base->ofs_last) {
928 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
929 struct base_data *result = alloc_base_data();
930
931 assert(child->real_type == OBJ_OFS_DELTA);
932 resolve_delta(child, base, result);
933 if (base->ofs_first == base->ofs_last)
934 free_base_data(base);
935
936 base->ofs_first++;
937 return result;
938 }
939
940 unlink_base_data(base);
941 return NULL;
942 }
943
944 static void find_unresolved_deltas(struct base_data *base)
945 {
946 struct base_data *new_base, *prev_base = NULL;
947 for (;;) {
948 new_base = find_unresolved_deltas_1(base, prev_base);
949
950 if (new_base) {
951 prev_base = base;
952 base = new_base;
953 } else {
954 free(base);
955 base = prev_base;
956 if (!base)
957 return;
958 prev_base = base->base;
959 }
960 }
961 }
962
963 static int compare_delta_entry(const void *a, const void *b)
964 {
965 const struct delta_entry *delta_a = a;
966 const struct delta_entry *delta_b = b;
967
968 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
969 return compare_delta_bases(&delta_a->base, &delta_b->base,
970 objects[delta_a->obj_no].type,
971 objects[delta_b->obj_no].type);
972 }
973
974 static void resolve_base(struct object_entry *obj)
975 {
976 struct base_data *base_obj = alloc_base_data();
977 base_obj->obj = obj;
978 base_obj->data = NULL;
979 find_unresolved_deltas(base_obj);
980 }
981
982 #ifndef NO_PTHREADS
983 static void *threaded_second_pass(void *data)
984 {
985 set_thread_data(data);
986 for (;;) {
987 int i;
988 counter_lock();
989 display_progress(progress, nr_resolved_deltas);
990 counter_unlock();
991 work_lock();
992 while (nr_dispatched < nr_objects &&
993 is_delta_type(objects[nr_dispatched].type))
994 nr_dispatched++;
995 if (nr_dispatched >= nr_objects) {
996 work_unlock();
997 break;
998 }
999 i = nr_dispatched++;
1000 work_unlock();
1001
1002 resolve_base(&objects[i]);
1003 }
1004 return NULL;
1005 }
1006 #endif
1007
1008 /*
1009 * First pass:
1010 * - find locations of all objects;
1011 * - calculate SHA1 of all non-delta objects;
1012 * - remember base (SHA1 or offset) for all deltas.
1013 */
1014 static void parse_pack_objects(unsigned char *sha1)
1015 {
1016 int i, nr_delays = 0;
1017 struct delta_entry *delta = deltas;
1018 struct stat st;
1019
1020 if (verbose)
1021 progress = start_progress(
1022 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1023 nr_objects);
1024 for (i = 0; i < nr_objects; i++) {
1025 struct object_entry *obj = &objects[i];
1026 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
1027 obj->real_type = obj->type;
1028 if (is_delta_type(obj->type)) {
1029 nr_deltas++;
1030 delta->obj_no = i;
1031 delta++;
1032 } else if (!data) {
1033 /* large blobs, check later */
1034 obj->real_type = OBJ_BAD;
1035 nr_delays++;
1036 } else
1037 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1038 free(data);
1039 display_progress(progress, i+1);
1040 }
1041 objects[i].idx.offset = consumed_bytes;
1042 stop_progress(&progress);
1043
1044 /* Check pack integrity */
1045 flush();
1046 git_SHA1_Final(sha1, &input_ctx);
1047 if (hashcmp(fill(20), sha1))
1048 die(_("pack is corrupted (SHA1 mismatch)"));
1049 use(20);
1050
1051 /* If input_fd is a file, we should have reached its end now. */
1052 if (fstat(input_fd, &st))
1053 die_errno(_("cannot fstat packfile"));
1054 if (S_ISREG(st.st_mode) &&
1055 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1056 die(_("pack has junk at the end"));
1057
1058 for (i = 0; i < nr_objects; i++) {
1059 struct object_entry *obj = &objects[i];
1060 if (obj->real_type != OBJ_BAD)
1061 continue;
1062 obj->real_type = obj->type;
1063 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1064 nr_delays--;
1065 }
1066 if (nr_delays)
1067 die(_("confusion beyond insanity in parse_pack_objects()"));
1068 }
1069
1070 /*
1071 * Second pass:
1072 * - for all non-delta objects, look if it is used as a base for
1073 * deltas;
1074 * - if used as a base, uncompress the object and apply all deltas,
1075 * recursively checking if the resulting object is used as a base
1076 * for some more deltas.
1077 */
1078 static void resolve_deltas(void)
1079 {
1080 int i;
1081
1082 if (!nr_deltas)
1083 return;
1084
1085 /* Sort deltas by base SHA1/offset for fast searching */
1086 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1087 compare_delta_entry);
1088
1089 if (verbose)
1090 progress = start_progress(_("Resolving deltas"), nr_deltas);
1091
1092 #ifndef NO_PTHREADS
1093 nr_dispatched = 0;
1094 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1095 init_thread();
1096 for (i = 0; i < nr_threads; i++) {
1097 int ret = pthread_create(&thread_data[i].thread, NULL,
1098 threaded_second_pass, thread_data + i);
1099 if (ret)
1100 die(_("unable to create thread: %s"),
1101 strerror(ret));
1102 }
1103 for (i = 0; i < nr_threads; i++)
1104 pthread_join(thread_data[i].thread, NULL);
1105 cleanup_thread();
1106 return;
1107 }
1108 #endif
1109
1110 for (i = 0; i < nr_objects; i++) {
1111 struct object_entry *obj = &objects[i];
1112
1113 if (is_delta_type(obj->type))
1114 continue;
1115 resolve_base(obj);
1116 display_progress(progress, nr_resolved_deltas);
1117 }
1118 }
1119
1120 /*
1121 * Third pass:
1122 * - append objects to convert thin pack to full pack if required
1123 * - write the final 20-byte SHA-1
1124 */
1125 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1126 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1127 {
1128 if (nr_deltas == nr_resolved_deltas) {
1129 stop_progress(&progress);
1130 /* Flush remaining pack final 20-byte SHA1. */
1131 flush();
1132 return;
1133 }
1134
1135 if (fix_thin_pack) {
1136 struct sha1file *f;
1137 unsigned char read_sha1[20], tail_sha1[20];
1138 struct strbuf msg = STRBUF_INIT;
1139 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1140 int nr_objects_initial = nr_objects;
1141 if (nr_unresolved <= 0)
1142 die(_("confusion beyond insanity"));
1143 objects = xrealloc(objects,
1144 (nr_objects + nr_unresolved + 1)
1145 * sizeof(*objects));
1146 memset(objects + nr_objects + 1, 0,
1147 nr_unresolved * sizeof(*objects));
1148 f = sha1fd(output_fd, curr_pack);
1149 fix_unresolved_deltas(f, nr_unresolved);
1150 strbuf_addf(&msg, _("completed with %d local objects"),
1151 nr_objects - nr_objects_initial);
1152 stop_progress_msg(&progress, msg.buf);
1153 strbuf_release(&msg);
1154 sha1close(f, tail_sha1, 0);
1155 hashcpy(read_sha1, pack_sha1);
1156 fixup_pack_header_footer(output_fd, pack_sha1,
1157 curr_pack, nr_objects,
1158 read_sha1, consumed_bytes-20);
1159 if (hashcmp(read_sha1, tail_sha1) != 0)
1160 die(_("Unexpected tail checksum for %s "
1161 "(disk corruption?)"), curr_pack);
1162 }
1163 if (nr_deltas != nr_resolved_deltas)
1164 die(Q_("pack has %d unresolved delta",
1165 "pack has %d unresolved deltas",
1166 nr_deltas - nr_resolved_deltas),
1167 nr_deltas - nr_resolved_deltas);
1168 }
1169
1170 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1171 {
1172 git_zstream stream;
1173 int status;
1174 unsigned char outbuf[4096];
1175
1176 memset(&stream, 0, sizeof(stream));
1177 git_deflate_init(&stream, zlib_compression_level);
1178 stream.next_in = in;
1179 stream.avail_in = size;
1180
1181 do {
1182 stream.next_out = outbuf;
1183 stream.avail_out = sizeof(outbuf);
1184 status = git_deflate(&stream, Z_FINISH);
1185 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1186 } while (status == Z_OK);
1187
1188 if (status != Z_STREAM_END)
1189 die(_("unable to deflate appended object (%d)"), status);
1190 size = stream.total_out;
1191 git_deflate_end(&stream);
1192 return size;
1193 }
1194
1195 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1196 const unsigned char *sha1, void *buf,
1197 unsigned long size, enum object_type type)
1198 {
1199 struct object_entry *obj = &objects[nr_objects++];
1200 unsigned char header[10];
1201 unsigned long s = size;
1202 int n = 0;
1203 unsigned char c = (type << 4) | (s & 15);
1204 s >>= 4;
1205 while (s) {
1206 header[n++] = c | 0x80;
1207 c = s & 0x7f;
1208 s >>= 7;
1209 }
1210 header[n++] = c;
1211 crc32_begin(f);
1212 sha1write(f, header, n);
1213 obj[0].size = size;
1214 obj[0].hdr_size = n;
1215 obj[0].type = type;
1216 obj[0].real_type = type;
1217 obj[1].idx.offset = obj[0].idx.offset + n;
1218 obj[1].idx.offset += write_compressed(f, buf, size);
1219 obj[0].idx.crc32 = crc32_end(f);
1220 sha1flush(f);
1221 hashcpy(obj->idx.sha1, sha1);
1222 return obj;
1223 }
1224
1225 static int delta_pos_compare(const void *_a, const void *_b)
1226 {
1227 struct delta_entry *a = *(struct delta_entry **)_a;
1228 struct delta_entry *b = *(struct delta_entry **)_b;
1229 return a->obj_no - b->obj_no;
1230 }
1231
1232 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1233 {
1234 struct delta_entry **sorted_by_pos;
1235 int i, n = 0;
1236
1237 /*
1238 * Since many unresolved deltas may well be themselves base objects
1239 * for more unresolved deltas, we really want to include the
1240 * smallest number of base objects that would cover as much delta
1241 * as possible by picking the
1242 * trunc deltas first, allowing for other deltas to resolve without
1243 * additional base objects. Since most base objects are to be found
1244 * before deltas depending on them, a good heuristic is to start
1245 * resolving deltas in the same order as their position in the pack.
1246 */
1247 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1248 for (i = 0; i < nr_deltas; i++) {
1249 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1250 continue;
1251 sorted_by_pos[n++] = &deltas[i];
1252 }
1253 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1254
1255 for (i = 0; i < n; i++) {
1256 struct delta_entry *d = sorted_by_pos[i];
1257 enum object_type type;
1258 struct base_data *base_obj = alloc_base_data();
1259
1260 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1261 continue;
1262 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1263 if (!base_obj->data)
1264 continue;
1265
1266 if (check_sha1_signature(d->base.sha1, base_obj->data,
1267 base_obj->size, typename(type)))
1268 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1269 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1270 base_obj->data, base_obj->size, type);
1271 find_unresolved_deltas(base_obj);
1272 display_progress(progress, nr_resolved_deltas);
1273 }
1274 free(sorted_by_pos);
1275 }
1276
1277 static void final(const char *final_pack_name, const char *curr_pack_name,
1278 const char *final_index_name, const char *curr_index_name,
1279 const char *keep_name, const char *keep_msg,
1280 unsigned char *sha1)
1281 {
1282 const char *report = "pack";
1283 char name[PATH_MAX];
1284 int err;
1285
1286 if (!from_stdin) {
1287 close(input_fd);
1288 } else {
1289 fsync_or_die(output_fd, curr_pack_name);
1290 err = close(output_fd);
1291 if (err)
1292 die_errno(_("error while closing pack file"));
1293 }
1294
1295 if (keep_msg) {
1296 int keep_fd, keep_msg_len = strlen(keep_msg);
1297
1298 if (!keep_name)
1299 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1300 else
1301 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1302
1303 if (keep_fd < 0) {
1304 if (errno != EEXIST)
1305 die_errno(_("cannot write keep file '%s'"),
1306 keep_name ? keep_name : name);
1307 } else {
1308 if (keep_msg_len > 0) {
1309 write_or_die(keep_fd, keep_msg, keep_msg_len);
1310 write_or_die(keep_fd, "\n", 1);
1311 }
1312 if (close(keep_fd) != 0)
1313 die_errno(_("cannot close written keep file '%s'"),
1314 keep_name ? keep_name : name);
1315 report = "keep";
1316 }
1317 }
1318
1319 if (final_pack_name != curr_pack_name) {
1320 if (!final_pack_name) {
1321 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1322 get_object_directory(), sha1_to_hex(sha1));
1323 final_pack_name = name;
1324 }
1325 if (move_temp_to_file(curr_pack_name, final_pack_name))
1326 die(_("cannot store pack file"));
1327 } else if (from_stdin)
1328 chmod(final_pack_name, 0444);
1329
1330 if (final_index_name != curr_index_name) {
1331 if (!final_index_name) {
1332 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1333 get_object_directory(), sha1_to_hex(sha1));
1334 final_index_name = name;
1335 }
1336 if (move_temp_to_file(curr_index_name, final_index_name))
1337 die(_("cannot store index file"));
1338 } else
1339 chmod(final_index_name, 0444);
1340
1341 if (!from_stdin) {
1342 printf("%s\n", sha1_to_hex(sha1));
1343 } else {
1344 char buf[48];
1345 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1346 report, sha1_to_hex(sha1));
1347 write_or_die(1, buf, len);
1348
1349 /*
1350 * Let's just mimic git-unpack-objects here and write
1351 * the last part of the input buffer to stdout.
1352 */
1353 while (input_len) {
1354 err = xwrite(1, input_buffer + input_offset, input_len);
1355 if (err <= 0)
1356 break;
1357 input_len -= err;
1358 input_offset += err;
1359 }
1360 }
1361 }
1362
1363 static int git_index_pack_config(const char *k, const char *v, void *cb)
1364 {
1365 struct pack_idx_option *opts = cb;
1366
1367 if (!strcmp(k, "pack.indexversion")) {
1368 opts->version = git_config_int(k, v);
1369 if (opts->version > 2)
1370 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1371 return 0;
1372 }
1373 if (!strcmp(k, "pack.threads")) {
1374 nr_threads = git_config_int(k, v);
1375 if (nr_threads < 0)
1376 die(_("invalid number of threads specified (%d)"),
1377 nr_threads);
1378 #ifdef NO_PTHREADS
1379 if (nr_threads != 1)
1380 warning(_("no threads support, ignoring %s"), k);
1381 nr_threads = 1;
1382 #endif
1383 return 0;
1384 }
1385 return git_default_config(k, v, cb);
1386 }
1387
1388 static int cmp_uint32(const void *a_, const void *b_)
1389 {
1390 uint32_t a = *((uint32_t *)a_);
1391 uint32_t b = *((uint32_t *)b_);
1392
1393 return (a < b) ? -1 : (a != b);
1394 }
1395
1396 static void read_v2_anomalous_offsets(struct packed_git *p,
1397 struct pack_idx_option *opts)
1398 {
1399 const uint32_t *idx1, *idx2;
1400 uint32_t i;
1401
1402 /* The address of the 4-byte offset table */
1403 idx1 = (((const uint32_t *)p->index_data)
1404 + 2 /* 8-byte header */
1405 + 256 /* fan out */
1406 + 5 * p->num_objects /* 20-byte SHA-1 table */
1407 + p->num_objects /* CRC32 table */
1408 );
1409
1410 /* The address of the 8-byte offset table */
1411 idx2 = idx1 + p->num_objects;
1412
1413 for (i = 0; i < p->num_objects; i++) {
1414 uint32_t off = ntohl(idx1[i]);
1415 if (!(off & 0x80000000))
1416 continue;
1417 off = off & 0x7fffffff;
1418 if (idx2[off * 2])
1419 continue;
1420 /*
1421 * The real offset is ntohl(idx2[off * 2]) in high 4
1422 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1423 * octets. But idx2[off * 2] is Zero!!!
1424 */
1425 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1426 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1427 }
1428
1429 if (1 < opts->anomaly_nr)
1430 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1431 }
1432
1433 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1434 {
1435 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1436
1437 if (!p)
1438 die(_("Cannot open existing pack file '%s'"), pack_name);
1439 if (open_pack_index(p))
1440 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1441
1442 /* Read the attributes from the existing idx file */
1443 opts->version = p->index_version;
1444
1445 if (opts->version == 2)
1446 read_v2_anomalous_offsets(p, opts);
1447
1448 /*
1449 * Get rid of the idx file as we do not need it anymore.
1450 * NEEDSWORK: extract this bit from free_pack_by_name() in
1451 * sha1_file.c, perhaps? It shouldn't matter very much as we
1452 * know we haven't installed this pack (hence we never have
1453 * read anything from it).
1454 */
1455 close_pack_index(p);
1456 free(p);
1457 }
1458
1459 static void show_pack_info(int stat_only)
1460 {
1461 int i, baseobjects = nr_objects - nr_deltas;
1462 unsigned long *chain_histogram = NULL;
1463
1464 if (deepest_delta)
1465 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1466
1467 for (i = 0; i < nr_objects; i++) {
1468 struct object_entry *obj = &objects[i];
1469
1470 if (is_delta_type(obj->type))
1471 chain_histogram[obj->delta_depth - 1]++;
1472 if (stat_only)
1473 continue;
1474 printf("%s %-6s %lu %lu %"PRIuMAX,
1475 sha1_to_hex(obj->idx.sha1),
1476 typename(obj->real_type), obj->size,
1477 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1478 (uintmax_t)obj->idx.offset);
1479 if (is_delta_type(obj->type)) {
1480 struct object_entry *bobj = &objects[obj->base_object_no];
1481 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1482 }
1483 putchar('\n');
1484 }
1485
1486 if (baseobjects)
1487 printf_ln(Q_("non delta: %d object",
1488 "non delta: %d objects",
1489 baseobjects),
1490 baseobjects);
1491 for (i = 0; i < deepest_delta; i++) {
1492 if (!chain_histogram[i])
1493 continue;
1494 printf_ln(Q_("chain length = %d: %lu object",
1495 "chain length = %d: %lu objects",
1496 chain_histogram[i]),
1497 i + 1,
1498 chain_histogram[i]);
1499 }
1500 }
1501
1502 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1503 {
1504 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1505 const char *curr_index;
1506 const char *index_name = NULL, *pack_name = NULL;
1507 const char *keep_name = NULL, *keep_msg = NULL;
1508 char *index_name_buf = NULL, *keep_name_buf = NULL;
1509 struct pack_idx_entry **idx_objects;
1510 struct pack_idx_option opts;
1511 unsigned char pack_sha1[20];
1512 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1513
1514 if (argc == 2 && !strcmp(argv[1], "-h"))
1515 usage(index_pack_usage);
1516
1517 check_replace_refs = 0;
1518
1519 reset_pack_idx_option(&opts);
1520 git_config(git_index_pack_config, &opts);
1521 if (prefix && chdir(prefix))
1522 die(_("Cannot come back to cwd"));
1523
1524 for (i = 1; i < argc; i++) {
1525 const char *arg = argv[i];
1526
1527 if (*arg == '-') {
1528 if (!strcmp(arg, "--stdin")) {
1529 from_stdin = 1;
1530 } else if (!strcmp(arg, "--fix-thin")) {
1531 fix_thin_pack = 1;
1532 } else if (!strcmp(arg, "--strict")) {
1533 strict = 1;
1534 do_fsck_object = 1;
1535 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1536 strict = 1;
1537 check_self_contained_and_connected = 1;
1538 } else if (!strcmp(arg, "--verify")) {
1539 verify = 1;
1540 } else if (!strcmp(arg, "--verify-stat")) {
1541 verify = 1;
1542 show_stat = 1;
1543 } else if (!strcmp(arg, "--verify-stat-only")) {
1544 verify = 1;
1545 show_stat = 1;
1546 stat_only = 1;
1547 } else if (!strcmp(arg, "--keep")) {
1548 keep_msg = "";
1549 } else if (starts_with(arg, "--keep=")) {
1550 keep_msg = arg + 7;
1551 } else if (starts_with(arg, "--threads=")) {
1552 char *end;
1553 nr_threads = strtoul(arg+10, &end, 0);
1554 if (!arg[10] || *end || nr_threads < 0)
1555 usage(index_pack_usage);
1556 #ifdef NO_PTHREADS
1557 if (nr_threads != 1)
1558 warning(_("no threads support, "
1559 "ignoring %s"), arg);
1560 nr_threads = 1;
1561 #endif
1562 } else if (starts_with(arg, "--pack_header=")) {
1563 struct pack_header *hdr;
1564 char *c;
1565
1566 hdr = (struct pack_header *)input_buffer;
1567 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1568 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1569 if (*c != ',')
1570 die(_("bad %s"), arg);
1571 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1572 if (*c)
1573 die(_("bad %s"), arg);
1574 input_len = sizeof(*hdr);
1575 } else if (!strcmp(arg, "-v")) {
1576 verbose = 1;
1577 } else if (!strcmp(arg, "-o")) {
1578 if (index_name || (i+1) >= argc)
1579 usage(index_pack_usage);
1580 index_name = argv[++i];
1581 } else if (starts_with(arg, "--index-version=")) {
1582 char *c;
1583 opts.version = strtoul(arg + 16, &c, 10);
1584 if (opts.version > 2)
1585 die(_("bad %s"), arg);
1586 if (*c == ',')
1587 opts.off32_limit = strtoul(c+1, &c, 0);
1588 if (*c || opts.off32_limit & 0x80000000)
1589 die(_("bad %s"), arg);
1590 } else
1591 usage(index_pack_usage);
1592 continue;
1593 }
1594
1595 if (pack_name)
1596 usage(index_pack_usage);
1597 pack_name = arg;
1598 }
1599
1600 if (!pack_name && !from_stdin)
1601 usage(index_pack_usage);
1602 if (fix_thin_pack && !from_stdin)
1603 die(_("--fix-thin cannot be used without --stdin"));
1604 if (!index_name && pack_name) {
1605 int len = strlen(pack_name);
1606 if (!has_extension(pack_name, ".pack"))
1607 die(_("packfile name '%s' does not end with '.pack'"),
1608 pack_name);
1609 index_name_buf = xmalloc(len);
1610 memcpy(index_name_buf, pack_name, len - 5);
1611 strcpy(index_name_buf + len - 5, ".idx");
1612 index_name = index_name_buf;
1613 }
1614 if (keep_msg && !keep_name && pack_name) {
1615 int len = strlen(pack_name);
1616 if (!has_extension(pack_name, ".pack"))
1617 die(_("packfile name '%s' does not end with '.pack'"),
1618 pack_name);
1619 keep_name_buf = xmalloc(len);
1620 memcpy(keep_name_buf, pack_name, len - 5);
1621 strcpy(keep_name_buf + len - 5, ".keep");
1622 keep_name = keep_name_buf;
1623 }
1624 if (verify) {
1625 if (!index_name)
1626 die(_("--verify with no packfile name given"));
1627 read_idx_option(&opts, index_name);
1628 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1629 }
1630 if (strict)
1631 opts.flags |= WRITE_IDX_STRICT;
1632
1633 #ifndef NO_PTHREADS
1634 if (!nr_threads) {
1635 nr_threads = online_cpus();
1636 /* An experiment showed that more threads does not mean faster */
1637 if (nr_threads > 3)
1638 nr_threads = 3;
1639 }
1640 #endif
1641
1642 curr_pack = open_pack_file(pack_name);
1643 parse_pack_header();
1644 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1645 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1646 parse_pack_objects(pack_sha1);
1647 resolve_deltas();
1648 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1649 free(deltas);
1650 if (strict)
1651 foreign_nr = check_objects();
1652
1653 if (show_stat)
1654 show_pack_info(stat_only);
1655
1656 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1657 for (i = 0; i < nr_objects; i++)
1658 idx_objects[i] = &objects[i].idx;
1659 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1660 free(idx_objects);
1661
1662 if (!verify)
1663 final(pack_name, curr_pack,
1664 index_name, curr_index,
1665 keep_name, keep_msg,
1666 pack_sha1);
1667 else
1668 close(input_fd);
1669 free(objects);
1670 free(index_name_buf);
1671 free(keep_name_buf);
1672 if (pack_name == NULL)
1673 free((void *) curr_pack);
1674 if (index_name == NULL)
1675 free((void *) curr_index);
1676
1677 /*
1678 * Let the caller know this pack is not self contained
1679 */
1680 if (check_self_contained_and_connected && foreign_nr)
1681 return 1;
1682
1683 return 0;
1684 }