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index-pack: work around thread-unsafe pread()
[git/mjg.git] / builtin / index-pack.c
blobed489bbe9aab3ae7268f139f2d34c737880be49c
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 != obj->type || type <= 0)
211 die(_("object of unexpected type"));
212 obj->flags |= FLAG_CHECKED;
213 return 1;
214 }
215
216 return 0;
217 }
218
219 static unsigned check_objects(void)
220 {
221 unsigned i, max, foreign_nr = 0;
222
223 max = get_max_object_index();
224 for (i = 0; i < max; i++)
225 foreign_nr += check_object(get_indexed_object(i));
226 return foreign_nr;
227 }
228
229
230 /* Discard current buffer used content. */
231 static void flush(void)
232 {
233 if (input_offset) {
234 if (output_fd >= 0)
235 write_or_die(output_fd, input_buffer, input_offset);
236 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
237 memmove(input_buffer, input_buffer + input_offset, input_len);
238 input_offset = 0;
239 }
240 }
241
242 /*
243 * Make sure at least "min" bytes are available in the buffer, and
244 * return the pointer to the buffer.
245 */
246 static void *fill(int min)
247 {
248 if (min <= input_len)
249 return input_buffer + input_offset;
250 if (min > sizeof(input_buffer))
251 die(Q_("cannot fill %d byte",
252 "cannot fill %d bytes",
253 min),
254 min);
255 flush();
256 do {
257 ssize_t ret = xread(input_fd, input_buffer + input_len,
258 sizeof(input_buffer) - input_len);
259 if (ret <= 0) {
260 if (!ret)
261 die(_("early EOF"));
262 die_errno(_("read error on input"));
263 }
264 input_len += ret;
265 if (from_stdin)
266 display_throughput(progress, consumed_bytes + input_len);
267 } while (input_len < min);
268 return input_buffer;
269 }
270
271 static void use(int bytes)
272 {
273 if (bytes > input_len)
274 die(_("used more bytes than were available"));
275 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
276 input_len -= bytes;
277 input_offset += bytes;
278
279 /* make sure off_t is sufficiently large not to wrap */
280 if (signed_add_overflows(consumed_bytes, bytes))
281 die(_("pack too large for current definition of off_t"));
282 consumed_bytes += bytes;
283 }
284
285 static const char *open_pack_file(const char *pack_name)
286 {
287 if (from_stdin) {
288 input_fd = 0;
289 if (!pack_name) {
290 static char tmp_file[PATH_MAX];
291 output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
292 "pack/tmp_pack_XXXXXX");
293 pack_name = xstrdup(tmp_file);
294 } else
295 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
296 if (output_fd < 0)
297 die_errno(_("unable to create '%s'"), pack_name);
298 nothread_data.pack_fd = output_fd;
299 } else {
300 input_fd = open(pack_name, O_RDONLY);
301 if (input_fd < 0)
302 die_errno(_("cannot open packfile '%s'"), pack_name);
303 output_fd = -1;
304 nothread_data.pack_fd = input_fd;
305 }
306 git_SHA1_Init(&input_ctx);
307 return pack_name;
308 }
309
310 static void parse_pack_header(void)
311 {
312 struct pack_header *hdr = fill(sizeof(struct pack_header));
313
314 /* Header consistency check */
315 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
316 die(_("pack signature mismatch"));
317 if (!pack_version_ok(hdr->hdr_version))
318 die(_("pack version %"PRIu32" unsupported"),
319 ntohl(hdr->hdr_version));
320
321 nr_objects = ntohl(hdr->hdr_entries);
322 use(sizeof(struct pack_header));
323 }
324
325 static NORETURN void bad_object(unsigned long offset, const char *format,
326 ...) __attribute__((format (printf, 2, 3)));
327
328 static NORETURN void bad_object(unsigned long offset, const char *format, ...)
329 {
330 va_list params;
331 char buf[1024];
332
333 va_start(params, format);
334 vsnprintf(buf, sizeof(buf), format, params);
335 va_end(params);
336 die(_("pack has bad object at offset %lu: %s"), offset, buf);
337 }
338
339 static inline struct thread_local *get_thread_data(void)
340 {
341 #ifndef NO_PTHREADS
342 if (threads_active)
343 return pthread_getspecific(key);
344 assert(!threads_active &&
345 "This should only be reached when all threads are gone");
346 #endif
347 return &nothread_data;
348 }
349
350 #ifndef NO_PTHREADS
351 static void set_thread_data(struct thread_local *data)
352 {
353 if (threads_active)
354 pthread_setspecific(key, data);
355 }
356 #endif
357
358 static struct base_data *alloc_base_data(void)
359 {
360 struct base_data *base = xmalloc(sizeof(struct base_data));
361 memset(base, 0, sizeof(*base));
362 base->ref_last = -1;
363 base->ofs_last = -1;
364 return base;
365 }
366
367 static void free_base_data(struct base_data *c)
368 {
369 if (c->data) {
370 free(c->data);
371 c->data = NULL;
372 get_thread_data()->base_cache_used -= c->size;
373 }
374 }
375
376 static void prune_base_data(struct base_data *retain)
377 {
378 struct base_data *b;
379 struct thread_local *data = get_thread_data();
380 for (b = data->base_cache;
381 data->base_cache_used > delta_base_cache_limit && b;
382 b = b->child) {
383 if (b->data && b != retain)
384 free_base_data(b);
385 }
386 }
387
388 static void link_base_data(struct base_data *base, struct base_data *c)
389 {
390 if (base)
391 base->child = c;
392 else
393 get_thread_data()->base_cache = c;
394
395 c->base = base;
396 c->child = NULL;
397 if (c->data)
398 get_thread_data()->base_cache_used += c->size;
399 prune_base_data(c);
400 }
401
402 static void unlink_base_data(struct base_data *c)
403 {
404 struct base_data *base = c->base;
405 if (base)
406 base->child = NULL;
407 else
408 get_thread_data()->base_cache = NULL;
409 free_base_data(c);
410 }
411
412 static int is_delta_type(enum object_type type)
413 {
414 return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
415 }
416
417 static void *unpack_entry_data(unsigned long offset, unsigned long size,
418 enum object_type type, unsigned char *sha1)
419 {
420 static char fixed_buf[8192];
421 int status;
422 git_zstream stream;
423 void *buf;
424 git_SHA_CTX c;
425 char hdr[32];
426 int hdrlen;
427
428 if (!is_delta_type(type)) {
429 hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
430 git_SHA1_Init(&c);
431 git_SHA1_Update(&c, hdr, hdrlen);
432 } else
433 sha1 = NULL;
434 if (type == OBJ_BLOB && size > big_file_threshold)
435 buf = fixed_buf;
436 else
437 buf = xmalloc(size);
438
439 memset(&stream, 0, sizeof(stream));
440 git_inflate_init(&stream);
441 stream.next_out = buf;
442 stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
443
444 do {
445 unsigned char *last_out = stream.next_out;
446 stream.next_in = fill(1);
447 stream.avail_in = input_len;
448 status = git_inflate(&stream, 0);
449 use(input_len - stream.avail_in);
450 if (sha1)
451 git_SHA1_Update(&c, last_out, stream.next_out - last_out);
452 if (buf == fixed_buf) {
453 stream.next_out = buf;
454 stream.avail_out = sizeof(fixed_buf);
455 }
456 } while (status == Z_OK);
457 if (stream.total_out != size || status != Z_STREAM_END)
458 bad_object(offset, _("inflate returned %d"), status);
459 git_inflate_end(&stream);
460 if (sha1)
461 git_SHA1_Final(sha1, &c);
462 return buf == fixed_buf ? NULL : buf;
463 }
464
465 static void *unpack_raw_entry(struct object_entry *obj,
466 union delta_base *delta_base,
467 unsigned char *sha1)
468 {
469 unsigned char *p;
470 unsigned long size, c;
471 off_t base_offset;
472 unsigned shift;
473 void *data;
474
475 obj->idx.offset = consumed_bytes;
476 input_crc32 = crc32(0, NULL, 0);
477
478 p = fill(1);
479 c = *p;
480 use(1);
481 obj->type = (c >> 4) & 7;
482 size = (c & 15);
483 shift = 4;
484 while (c & 0x80) {
485 p = fill(1);
486 c = *p;
487 use(1);
488 size += (c & 0x7f) << shift;
489 shift += 7;
490 }
491 obj->size = size;
492
493 switch (obj->type) {
494 case OBJ_REF_DELTA:
495 hashcpy(delta_base->sha1, fill(20));
496 use(20);
497 break;
498 case OBJ_OFS_DELTA:
499 memset(delta_base, 0, sizeof(*delta_base));
500 p = fill(1);
501 c = *p;
502 use(1);
503 base_offset = c & 127;
504 while (c & 128) {
505 base_offset += 1;
506 if (!base_offset || MSB(base_offset, 7))
507 bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
508 p = fill(1);
509 c = *p;
510 use(1);
511 base_offset = (base_offset << 7) + (c & 127);
512 }
513 delta_base->offset = obj->idx.offset - base_offset;
514 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
515 bad_object(obj->idx.offset, _("delta base offset is out of bound"));
516 break;
517 case OBJ_COMMIT:
518 case OBJ_TREE:
519 case OBJ_BLOB:
520 case OBJ_TAG:
521 break;
522 default:
523 bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
524 }
525 obj->hdr_size = consumed_bytes - obj->idx.offset;
526
527 data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
528 obj->idx.crc32 = input_crc32;
529 return data;
530 }
531
532 static void *unpack_data(struct object_entry *obj,
533 int (*consume)(const unsigned char *, unsigned long, void *),
534 void *cb_data)
535 {
536 off_t from = obj[0].idx.offset + obj[0].hdr_size;
537 unsigned long len = obj[1].idx.offset - from;
538 unsigned char *data, *inbuf;
539 git_zstream stream;
540 int status;
541
542 data = xmalloc(consume ? 64*1024 : obj->size);
543 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
544
545 memset(&stream, 0, sizeof(stream));
546 git_inflate_init(&stream);
547 stream.next_out = data;
548 stream.avail_out = consume ? 64*1024 : obj->size;
549
550 do {
551 ssize_t n = (len < 64*1024) ? len : 64*1024;
552 n = pread(get_thread_data()->pack_fd, inbuf, n, from);
553 if (n < 0)
554 die_errno(_("cannot pread pack file"));
555 if (!n)
556 die(Q_("premature end of pack file, %lu byte missing",
557 "premature end of pack file, %lu bytes missing",
558 len),
559 len);
560 from += n;
561 len -= n;
562 stream.next_in = inbuf;
563 stream.avail_in = n;
564 if (!consume)
565 status = git_inflate(&stream, 0);
566 else {
567 do {
568 status = git_inflate(&stream, 0);
569 if (consume(data, stream.next_out - data, cb_data)) {
570 free(inbuf);
571 free(data);
572 return NULL;
573 }
574 stream.next_out = data;
575 stream.avail_out = 64*1024;
576 } while (status == Z_OK && stream.avail_in);
577 }
578 } while (len && status == Z_OK && !stream.avail_in);
579
580 /* This has been inflated OK when first encountered, so... */
581 if (status != Z_STREAM_END || stream.total_out != obj->size)
582 die(_("serious inflate inconsistency"));
583
584 git_inflate_end(&stream);
585 free(inbuf);
586 if (consume) {
587 free(data);
588 data = NULL;
589 }
590 return data;
591 }
592
593 static void *get_data_from_pack(struct object_entry *obj)
594 {
595 return unpack_data(obj, NULL, NULL);
596 }
597
598 static int compare_delta_bases(const union delta_base *base1,
599 const union delta_base *base2,
600 enum object_type type1,
601 enum object_type type2)
602 {
603 int cmp = type1 - type2;
604 if (cmp)
605 return cmp;
606 return memcmp(base1, base2, UNION_BASE_SZ);
607 }
608
609 static int find_delta(const union delta_base *base, enum object_type type)
610 {
611 int first = 0, last = nr_deltas;
612
613 while (first < last) {
614 int next = (first + last) / 2;
615 struct delta_entry *delta = &deltas[next];
616 int cmp;
617
618 cmp = compare_delta_bases(base, &delta->base,
619 type, objects[delta->obj_no].type);
620 if (!cmp)
621 return next;
622 if (cmp < 0) {
623 last = next;
624 continue;
625 }
626 first = next+1;
627 }
628 return -first-1;
629 }
630
631 static void find_delta_children(const union delta_base *base,
632 int *first_index, int *last_index,
633 enum object_type type)
634 {
635 int first = find_delta(base, type);
636 int last = first;
637 int end = nr_deltas - 1;
638
639 if (first < 0) {
640 *first_index = 0;
641 *last_index = -1;
642 return;
643 }
644 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
645 --first;
646 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
647 ++last;
648 *first_index = first;
649 *last_index = last;
650 }
651
652 struct compare_data {
653 struct object_entry *entry;
654 struct git_istream *st;
655 unsigned char *buf;
656 unsigned long buf_size;
657 };
658
659 static int compare_objects(const unsigned char *buf, unsigned long size,
660 void *cb_data)
661 {
662 struct compare_data *data = cb_data;
663
664 if (data->buf_size < size) {
665 free(data->buf);
666 data->buf = xmalloc(size);
667 data->buf_size = size;
668 }
669
670 while (size) {
671 ssize_t len = read_istream(data->st, data->buf, size);
672 if (len == 0)
673 die(_("SHA1 COLLISION FOUND WITH %s !"),
674 sha1_to_hex(data->entry->idx.sha1));
675 if (len < 0)
676 die(_("unable to read %s"),
677 sha1_to_hex(data->entry->idx.sha1));
678 if (memcmp(buf, data->buf, len))
679 die(_("SHA1 COLLISION FOUND WITH %s !"),
680 sha1_to_hex(data->entry->idx.sha1));
681 size -= len;
682 buf += len;
683 }
684 return 0;
685 }
686
687 static int check_collison(struct object_entry *entry)
688 {
689 struct compare_data data;
690 enum object_type type;
691 unsigned long size;
692
693 if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
694 return -1;
695
696 memset(&data, 0, sizeof(data));
697 data.entry = entry;
698 data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
699 if (!data.st)
700 return -1;
701 if (size != entry->size || type != entry->type)
702 die(_("SHA1 COLLISION FOUND WITH %s !"),
703 sha1_to_hex(entry->idx.sha1));
704 unpack_data(entry, compare_objects, &data);
705 close_istream(data.st);
706 free(data.buf);
707 return 0;
708 }
709
710 static void sha1_object(const void *data, struct object_entry *obj_entry,
711 unsigned long size, enum object_type type,
712 const unsigned char *sha1)
713 {
714 void *new_data = NULL;
715 int collision_test_needed;
716
717 assert(data || obj_entry);
718
719 read_lock();
720 collision_test_needed = has_sha1_file(sha1);
721 read_unlock();
722
723 if (collision_test_needed && !data) {
724 read_lock();
725 if (!check_collison(obj_entry))
726 collision_test_needed = 0;
727 read_unlock();
728 }
729 if (collision_test_needed) {
730 void *has_data;
731 enum object_type has_type;
732 unsigned long has_size;
733 read_lock();
734 has_type = sha1_object_info(sha1, &has_size);
735 if (has_type != type || has_size != size)
736 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
737 has_data = read_sha1_file(sha1, &has_type, &has_size);
738 read_unlock();
739 if (!data)
740 data = new_data = get_data_from_pack(obj_entry);
741 if (!has_data)
742 die(_("cannot read existing object %s"), sha1_to_hex(sha1));
743 if (size != has_size || type != has_type ||
744 memcmp(data, has_data, size) != 0)
745 die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
746 free(has_data);
747 }
748
749 if (strict) {
750 read_lock();
751 if (type == OBJ_BLOB) {
752 struct blob *blob = lookup_blob(sha1);
753 if (blob)
754 blob->object.flags |= FLAG_CHECKED;
755 else
756 die(_("invalid blob object %s"), sha1_to_hex(sha1));
757 } else {
758 struct object *obj;
759 int eaten;
760 void *buf = (void *) data;
761
762 assert(data && "data can only be NULL for large _blobs_");
763
764 /*
765 * we do not need to free the memory here, as the
766 * buf is deleted by the caller.
767 */
768 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
769 if (!obj)
770 die(_("invalid %s"), typename(type));
771 if (do_fsck_object &&
772 fsck_object(obj, 1, fsck_error_function))
773 die(_("Error in object"));
774 if (fsck_walk(obj, mark_link, NULL))
775 die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
776
777 if (obj->type == OBJ_TREE) {
778 struct tree *item = (struct tree *) obj;
779 item->buffer = NULL;
780 obj->parsed = 0;
781 }
782 if (obj->type == OBJ_COMMIT) {
783 struct commit *commit = (struct commit *) obj;
784 commit->buffer = NULL;
785 }
786 obj->flags |= FLAG_CHECKED;
787 }
788 read_unlock();
789 }
790
791 free(new_data);
792 }
793
794 /*
795 * This function is part of find_unresolved_deltas(). There are two
796 * walkers going in the opposite ways.
797 *
798 * The first one in find_unresolved_deltas() traverses down from
799 * parent node to children, deflating nodes along the way. However,
800 * memory for deflated nodes is limited by delta_base_cache_limit, so
801 * at some point parent node's deflated content may be freed.
802 *
803 * The second walker is this function, which goes from current node up
804 * to top parent if necessary to deflate the node. In normal
805 * situation, its parent node would be already deflated, so it just
806 * needs to apply delta.
807 *
808 * In the worst case scenario, parent node is no longer deflated because
809 * we're running out of delta_base_cache_limit; we need to re-deflate
810 * parents, possibly up to the top base.
811 *
812 * All deflated objects here are subject to be freed if we exceed
813 * delta_base_cache_limit, just like in find_unresolved_deltas(), we
814 * just need to make sure the last node is not freed.
815 */
816 static void *get_base_data(struct base_data *c)
817 {
818 if (!c->data) {
819 struct object_entry *obj = c->obj;
820 struct base_data **delta = NULL;
821 int delta_nr = 0, delta_alloc = 0;
822
823 while (is_delta_type(c->obj->type) && !c->data) {
824 ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
825 delta[delta_nr++] = c;
826 c = c->base;
827 }
828 if (!delta_nr) {
829 c->data = get_data_from_pack(obj);
830 c->size = obj->size;
831 get_thread_data()->base_cache_used += c->size;
832 prune_base_data(c);
833 }
834 for (; delta_nr > 0; delta_nr--) {
835 void *base, *raw;
836 c = delta[delta_nr - 1];
837 obj = c->obj;
838 base = get_base_data(c->base);
839 raw = get_data_from_pack(obj);
840 c->data = patch_delta(
841 base, c->base->size,
842 raw, obj->size,
843 &c->size);
844 free(raw);
845 if (!c->data)
846 bad_object(obj->idx.offset, _("failed to apply delta"));
847 get_thread_data()->base_cache_used += c->size;
848 prune_base_data(c);
849 }
850 free(delta);
851 }
852 return c->data;
853 }
854
855 static void resolve_delta(struct object_entry *delta_obj,
856 struct base_data *base, struct base_data *result)
857 {
858 void *base_data, *delta_data;
859
860 delta_obj->real_type = base->obj->real_type;
861 if (show_stat) {
862 delta_obj->delta_depth = base->obj->delta_depth + 1;
863 deepest_delta_lock();
864 if (deepest_delta < delta_obj->delta_depth)
865 deepest_delta = delta_obj->delta_depth;
866 deepest_delta_unlock();
867 }
868 delta_obj->base_object_no = base->obj - objects;
869 delta_data = get_data_from_pack(delta_obj);
870 base_data = get_base_data(base);
871 result->obj = delta_obj;
872 result->data = patch_delta(base_data, base->size,
873 delta_data, delta_obj->size, &result->size);
874 free(delta_data);
875 if (!result->data)
876 bad_object(delta_obj->idx.offset, _("failed to apply delta"));
877 hash_sha1_file(result->data, result->size,
878 typename(delta_obj->real_type), delta_obj->idx.sha1);
879 sha1_object(result->data, NULL, result->size, delta_obj->real_type,
880 delta_obj->idx.sha1);
881 counter_lock();
882 nr_resolved_deltas++;
883 counter_unlock();
884 }
885
886 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
887 struct base_data *prev_base)
888 {
889 if (base->ref_last == -1 && base->ofs_last == -1) {
890 union delta_base base_spec;
891
892 hashcpy(base_spec.sha1, base->obj->idx.sha1);
893 find_delta_children(&base_spec,
894 &base->ref_first, &base->ref_last, OBJ_REF_DELTA);
895
896 memset(&base_spec, 0, sizeof(base_spec));
897 base_spec.offset = base->obj->idx.offset;
898 find_delta_children(&base_spec,
899 &base->ofs_first, &base->ofs_last, OBJ_OFS_DELTA);
900
901 if (base->ref_last == -1 && base->ofs_last == -1) {
902 free(base->data);
903 return NULL;
904 }
905
906 link_base_data(prev_base, base);
907 }
908
909 if (base->ref_first <= base->ref_last) {
910 struct object_entry *child = objects + deltas[base->ref_first].obj_no;
911 struct base_data *result = alloc_base_data();
912
913 assert(child->real_type == OBJ_REF_DELTA);
914 resolve_delta(child, base, result);
915 if (base->ref_first == base->ref_last && base->ofs_last == -1)
916 free_base_data(base);
917
918 base->ref_first++;
919 return result;
920 }
921
922 if (base->ofs_first <= base->ofs_last) {
923 struct object_entry *child = objects + deltas[base->ofs_first].obj_no;
924 struct base_data *result = alloc_base_data();
925
926 assert(child->real_type == OBJ_OFS_DELTA);
927 resolve_delta(child, base, result);
928 if (base->ofs_first == base->ofs_last)
929 free_base_data(base);
930
931 base->ofs_first++;
932 return result;
933 }
934
935 unlink_base_data(base);
936 return NULL;
937 }
938
939 static void find_unresolved_deltas(struct base_data *base)
940 {
941 struct base_data *new_base, *prev_base = NULL;
942 for (;;) {
943 new_base = find_unresolved_deltas_1(base, prev_base);
944
945 if (new_base) {
946 prev_base = base;
947 base = new_base;
948 } else {
949 free(base);
950 base = prev_base;
951 if (!base)
952 return;
953 prev_base = base->base;
954 }
955 }
956 }
957
958 static int compare_delta_entry(const void *a, const void *b)
959 {
960 const struct delta_entry *delta_a = a;
961 const struct delta_entry *delta_b = b;
962
963 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
964 return compare_delta_bases(&delta_a->base, &delta_b->base,
965 objects[delta_a->obj_no].type,
966 objects[delta_b->obj_no].type);
967 }
968
969 static void resolve_base(struct object_entry *obj)
970 {
971 struct base_data *base_obj = alloc_base_data();
972 base_obj->obj = obj;
973 base_obj->data = NULL;
974 find_unresolved_deltas(base_obj);
975 }
976
977 #ifndef NO_PTHREADS
978 static void *threaded_second_pass(void *data)
979 {
980 set_thread_data(data);
981 for (;;) {
982 int i;
983 counter_lock();
984 display_progress(progress, nr_resolved_deltas);
985 counter_unlock();
986 work_lock();
987 while (nr_dispatched < nr_objects &&
988 is_delta_type(objects[nr_dispatched].type))
989 nr_dispatched++;
990 if (nr_dispatched >= nr_objects) {
991 work_unlock();
992 break;
993 }
994 i = nr_dispatched++;
995 work_unlock();
996
997 resolve_base(&objects[i]);
998 }
999 return NULL;
1000 }
1001 #endif
1002
1003 /*
1004 * First pass:
1005 * - find locations of all objects;
1006 * - calculate SHA1 of all non-delta objects;
1007 * - remember base (SHA1 or offset) for all deltas.
1008 */
1009 static void parse_pack_objects(unsigned char *sha1)
1010 {
1011 int i, nr_delays = 0;
1012 struct delta_entry *delta = deltas;
1013 struct stat st;
1014
1015 if (verbose)
1016 progress = start_progress(
1017 from_stdin ? _("Receiving objects") : _("Indexing objects"),
1018 nr_objects);
1019 for (i = 0; i < nr_objects; i++) {
1020 struct object_entry *obj = &objects[i];
1021 void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
1022 obj->real_type = obj->type;
1023 if (is_delta_type(obj->type)) {
1024 nr_deltas++;
1025 delta->obj_no = i;
1026 delta++;
1027 } else if (!data) {
1028 /* large blobs, check later */
1029 obj->real_type = OBJ_BAD;
1030 nr_delays++;
1031 } else
1032 sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
1033 free(data);
1034 display_progress(progress, i+1);
1035 }
1036 objects[i].idx.offset = consumed_bytes;
1037 stop_progress(&progress);
1038
1039 /* Check pack integrity */
1040 flush();
1041 git_SHA1_Final(sha1, &input_ctx);
1042 if (hashcmp(fill(20), sha1))
1043 die(_("pack is corrupted (SHA1 mismatch)"));
1044 use(20);
1045
1046 /* If input_fd is a file, we should have reached its end now. */
1047 if (fstat(input_fd, &st))
1048 die_errno(_("cannot fstat packfile"));
1049 if (S_ISREG(st.st_mode) &&
1050 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
1051 die(_("pack has junk at the end"));
1052
1053 for (i = 0; i < nr_objects; i++) {
1054 struct object_entry *obj = &objects[i];
1055 if (obj->real_type != OBJ_BAD)
1056 continue;
1057 obj->real_type = obj->type;
1058 sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
1059 nr_delays--;
1060 }
1061 if (nr_delays)
1062 die(_("confusion beyond insanity in parse_pack_objects()"));
1063 }
1064
1065 /*
1066 * Second pass:
1067 * - for all non-delta objects, look if it is used as a base for
1068 * deltas;
1069 * - if used as a base, uncompress the object and apply all deltas,
1070 * recursively checking if the resulting object is used as a base
1071 * for some more deltas.
1072 */
1073 static void resolve_deltas(void)
1074 {
1075 int i;
1076
1077 if (!nr_deltas)
1078 return;
1079
1080 /* Sort deltas by base SHA1/offset for fast searching */
1081 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
1082 compare_delta_entry);
1083
1084 if (verbose)
1085 progress = start_progress(_("Resolving deltas"), nr_deltas);
1086
1087 #ifndef NO_PTHREADS
1088 nr_dispatched = 0;
1089 if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
1090 init_thread();
1091 for (i = 0; i < nr_threads; i++) {
1092 int ret = pthread_create(&thread_data[i].thread, NULL,
1093 threaded_second_pass, thread_data + i);
1094 if (ret)
1095 die(_("unable to create thread: %s"),
1096 strerror(ret));
1097 }
1098 for (i = 0; i < nr_threads; i++)
1099 pthread_join(thread_data[i].thread, NULL);
1100 cleanup_thread();
1101 return;
1102 }
1103 #endif
1104
1105 for (i = 0; i < nr_objects; i++) {
1106 struct object_entry *obj = &objects[i];
1107
1108 if (is_delta_type(obj->type))
1109 continue;
1110 resolve_base(obj);
1111 display_progress(progress, nr_resolved_deltas);
1112 }
1113 }
1114
1115 /*
1116 * Third pass:
1117 * - append objects to convert thin pack to full pack if required
1118 * - write the final 20-byte SHA-1
1119 */
1120 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
1121 static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
1122 {
1123 if (nr_deltas == nr_resolved_deltas) {
1124 stop_progress(&progress);
1125 /* Flush remaining pack final 20-byte SHA1. */
1126 flush();
1127 return;
1128 }
1129
1130 if (fix_thin_pack) {
1131 struct sha1file *f;
1132 unsigned char read_sha1[20], tail_sha1[20];
1133 struct strbuf msg = STRBUF_INIT;
1134 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1135 int nr_objects_initial = nr_objects;
1136 if (nr_unresolved <= 0)
1137 die(_("confusion beyond insanity"));
1138 objects = xrealloc(objects,
1139 (nr_objects + nr_unresolved + 1)
1140 * sizeof(*objects));
1141 memset(objects + nr_objects + 1, 0,
1142 nr_unresolved * sizeof(*objects));
1143 f = sha1fd(output_fd, curr_pack);
1144 fix_unresolved_deltas(f, nr_unresolved);
1145 strbuf_addf(&msg, _("completed with %d local objects"),
1146 nr_objects - nr_objects_initial);
1147 stop_progress_msg(&progress, msg.buf);
1148 strbuf_release(&msg);
1149 sha1close(f, tail_sha1, 0);
1150 hashcpy(read_sha1, pack_sha1);
1151 fixup_pack_header_footer(output_fd, pack_sha1,
1152 curr_pack, nr_objects,
1153 read_sha1, consumed_bytes-20);
1154 if (hashcmp(read_sha1, tail_sha1) != 0)
1155 die(_("Unexpected tail checksum for %s "
1156 "(disk corruption?)"), curr_pack);
1157 }
1158 if (nr_deltas != nr_resolved_deltas)
1159 die(Q_("pack has %d unresolved delta",
1160 "pack has %d unresolved deltas",
1161 nr_deltas - nr_resolved_deltas),
1162 nr_deltas - nr_resolved_deltas);
1163 }
1164
1165 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
1166 {
1167 git_zstream stream;
1168 int status;
1169 unsigned char outbuf[4096];
1170
1171 memset(&stream, 0, sizeof(stream));
1172 git_deflate_init(&stream, zlib_compression_level);
1173 stream.next_in = in;
1174 stream.avail_in = size;
1175
1176 do {
1177 stream.next_out = outbuf;
1178 stream.avail_out = sizeof(outbuf);
1179 status = git_deflate(&stream, Z_FINISH);
1180 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
1181 } while (status == Z_OK);
1182
1183 if (status != Z_STREAM_END)
1184 die(_("unable to deflate appended object (%d)"), status);
1185 size = stream.total_out;
1186 git_deflate_end(&stream);
1187 return size;
1188 }
1189
1190 static struct object_entry *append_obj_to_pack(struct sha1file *f,
1191 const unsigned char *sha1, void *buf,
1192 unsigned long size, enum object_type type)
1193 {
1194 struct object_entry *obj = &objects[nr_objects++];
1195 unsigned char header[10];
1196 unsigned long s = size;
1197 int n = 0;
1198 unsigned char c = (type << 4) | (s & 15);
1199 s >>= 4;
1200 while (s) {
1201 header[n++] = c | 0x80;
1202 c = s & 0x7f;
1203 s >>= 7;
1204 }
1205 header[n++] = c;
1206 crc32_begin(f);
1207 sha1write(f, header, n);
1208 obj[0].size = size;
1209 obj[0].hdr_size = n;
1210 obj[0].type = type;
1211 obj[0].real_type = type;
1212 obj[1].idx.offset = obj[0].idx.offset + n;
1213 obj[1].idx.offset += write_compressed(f, buf, size);
1214 obj[0].idx.crc32 = crc32_end(f);
1215 sha1flush(f);
1216 hashcpy(obj->idx.sha1, sha1);
1217 return obj;
1218 }
1219
1220 static int delta_pos_compare(const void *_a, const void *_b)
1221 {
1222 struct delta_entry *a = *(struct delta_entry **)_a;
1223 struct delta_entry *b = *(struct delta_entry **)_b;
1224 return a->obj_no - b->obj_no;
1225 }
1226
1227 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
1228 {
1229 struct delta_entry **sorted_by_pos;
1230 int i, n = 0;
1231
1232 /*
1233 * Since many unresolved deltas may well be themselves base objects
1234 * for more unresolved deltas, we really want to include the
1235 * smallest number of base objects that would cover as much delta
1236 * as possible by picking the
1237 * trunc deltas first, allowing for other deltas to resolve without
1238 * additional base objects. Since most base objects are to be found
1239 * before deltas depending on them, a good heuristic is to start
1240 * resolving deltas in the same order as their position in the pack.
1241 */
1242 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
1243 for (i = 0; i < nr_deltas; i++) {
1244 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
1245 continue;
1246 sorted_by_pos[n++] = &deltas[i];
1247 }
1248 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
1249
1250 for (i = 0; i < n; i++) {
1251 struct delta_entry *d = sorted_by_pos[i];
1252 enum object_type type;
1253 struct base_data *base_obj = alloc_base_data();
1254
1255 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
1256 continue;
1257 base_obj->data = read_sha1_file(d->base.sha1, &type, &base_obj->size);
1258 if (!base_obj->data)
1259 continue;
1260
1261 if (check_sha1_signature(d->base.sha1, base_obj->data,
1262 base_obj->size, typename(type)))
1263 die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
1264 base_obj->obj = append_obj_to_pack(f, d->base.sha1,
1265 base_obj->data, base_obj->size, type);
1266 find_unresolved_deltas(base_obj);
1267 display_progress(progress, nr_resolved_deltas);
1268 }
1269 free(sorted_by_pos);
1270 }
1271
1272 static void final(const char *final_pack_name, const char *curr_pack_name,
1273 const char *final_index_name, const char *curr_index_name,
1274 const char *keep_name, const char *keep_msg,
1275 unsigned char *sha1)
1276 {
1277 const char *report = "pack";
1278 char name[PATH_MAX];
1279 int err;
1280
1281 if (!from_stdin) {
1282 close(input_fd);
1283 } else {
1284 fsync_or_die(output_fd, curr_pack_name);
1285 err = close(output_fd);
1286 if (err)
1287 die_errno(_("error while closing pack file"));
1288 }
1289
1290 if (keep_msg) {
1291 int keep_fd, keep_msg_len = strlen(keep_msg);
1292
1293 if (!keep_name)
1294 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
1295 else
1296 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
1297
1298 if (keep_fd < 0) {
1299 if (errno != EEXIST)
1300 die_errno(_("cannot write keep file '%s'"),
1301 keep_name);
1302 } else {
1303 if (keep_msg_len > 0) {
1304 write_or_die(keep_fd, keep_msg, keep_msg_len);
1305 write_or_die(keep_fd, "\n", 1);
1306 }
1307 if (close(keep_fd) != 0)
1308 die_errno(_("cannot close written keep file '%s'"),
1309 keep_name);
1310 report = "keep";
1311 }
1312 }
1313
1314 if (final_pack_name != curr_pack_name) {
1315 if (!final_pack_name) {
1316 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
1317 get_object_directory(), sha1_to_hex(sha1));
1318 final_pack_name = name;
1319 }
1320 if (move_temp_to_file(curr_pack_name, final_pack_name))
1321 die(_("cannot store pack file"));
1322 } else if (from_stdin)
1323 chmod(final_pack_name, 0444);
1324
1325 if (final_index_name != curr_index_name) {
1326 if (!final_index_name) {
1327 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
1328 get_object_directory(), sha1_to_hex(sha1));
1329 final_index_name = name;
1330 }
1331 if (move_temp_to_file(curr_index_name, final_index_name))
1332 die(_("cannot store index file"));
1333 } else
1334 chmod(final_index_name, 0444);
1335
1336 if (!from_stdin) {
1337 printf("%s\n", sha1_to_hex(sha1));
1338 } else {
1339 char buf[48];
1340 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
1341 report, sha1_to_hex(sha1));
1342 write_or_die(1, buf, len);
1343
1344 /*
1345 * Let's just mimic git-unpack-objects here and write
1346 * the last part of the input buffer to stdout.
1347 */
1348 while (input_len) {
1349 err = xwrite(1, input_buffer + input_offset, input_len);
1350 if (err <= 0)
1351 break;
1352 input_len -= err;
1353 input_offset += err;
1354 }
1355 }
1356 }
1357
1358 static int git_index_pack_config(const char *k, const char *v, void *cb)
1359 {
1360 struct pack_idx_option *opts = cb;
1361
1362 if (!strcmp(k, "pack.indexversion")) {
1363 opts->version = git_config_int(k, v);
1364 if (opts->version > 2)
1365 die(_("bad pack.indexversion=%"PRIu32), opts->version);
1366 return 0;
1367 }
1368 if (!strcmp(k, "pack.threads")) {
1369 nr_threads = git_config_int(k, v);
1370 if (nr_threads < 0)
1371 die(_("invalid number of threads specified (%d)"),
1372 nr_threads);
1373 #ifdef NO_PTHREADS
1374 if (nr_threads != 1)
1375 warning(_("no threads support, ignoring %s"), k);
1376 nr_threads = 1;
1377 #endif
1378 return 0;
1379 }
1380 return git_default_config(k, v, cb);
1381 }
1382
1383 static int cmp_uint32(const void *a_, const void *b_)
1384 {
1385 uint32_t a = *((uint32_t *)a_);
1386 uint32_t b = *((uint32_t *)b_);
1387
1388 return (a < b) ? -1 : (a != b);
1389 }
1390
1391 static void read_v2_anomalous_offsets(struct packed_git *p,
1392 struct pack_idx_option *opts)
1393 {
1394 const uint32_t *idx1, *idx2;
1395 uint32_t i;
1396
1397 /* The address of the 4-byte offset table */
1398 idx1 = (((const uint32_t *)p->index_data)
1399 + 2 /* 8-byte header */
1400 + 256 /* fan out */
1401 + 5 * p->num_objects /* 20-byte SHA-1 table */
1402 + p->num_objects /* CRC32 table */
1403 );
1404
1405 /* The address of the 8-byte offset table */
1406 idx2 = idx1 + p->num_objects;
1407
1408 for (i = 0; i < p->num_objects; i++) {
1409 uint32_t off = ntohl(idx1[i]);
1410 if (!(off & 0x80000000))
1411 continue;
1412 off = off & 0x7fffffff;
1413 if (idx2[off * 2])
1414 continue;
1415 /*
1416 * The real offset is ntohl(idx2[off * 2]) in high 4
1417 * octets, and ntohl(idx2[off * 2 + 1]) in low 4
1418 * octets. But idx2[off * 2] is Zero!!!
1419 */
1420 ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc);
1421 opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]);
1422 }
1423
1424 if (1 < opts->anomaly_nr)
1425 qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32);
1426 }
1427
1428 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
1429 {
1430 struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
1431
1432 if (!p)
1433 die(_("Cannot open existing pack file '%s'"), pack_name);
1434 if (open_pack_index(p))
1435 die(_("Cannot open existing pack idx file for '%s'"), pack_name);
1436
1437 /* Read the attributes from the existing idx file */
1438 opts->version = p->index_version;
1439
1440 if (opts->version == 2)
1441 read_v2_anomalous_offsets(p, opts);
1442
1443 /*
1444 * Get rid of the idx file as we do not need it anymore.
1445 * NEEDSWORK: extract this bit from free_pack_by_name() in
1446 * sha1_file.c, perhaps? It shouldn't matter very much as we
1447 * know we haven't installed this pack (hence we never have
1448 * read anything from it).
1449 */
1450 close_pack_index(p);
1451 free(p);
1452 }
1453
1454 static void show_pack_info(int stat_only)
1455 {
1456 int i, baseobjects = nr_objects - nr_deltas;
1457 unsigned long *chain_histogram = NULL;
1458
1459 if (deepest_delta)
1460 chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long));
1461
1462 for (i = 0; i < nr_objects; i++) {
1463 struct object_entry *obj = &objects[i];
1464
1465 if (is_delta_type(obj->type))
1466 chain_histogram[obj->delta_depth - 1]++;
1467 if (stat_only)
1468 continue;
1469 printf("%s %-6s %lu %lu %"PRIuMAX,
1470 sha1_to_hex(obj->idx.sha1),
1471 typename(obj->real_type), obj->size,
1472 (unsigned long)(obj[1].idx.offset - obj->idx.offset),
1473 (uintmax_t)obj->idx.offset);
1474 if (is_delta_type(obj->type)) {
1475 struct object_entry *bobj = &objects[obj->base_object_no];
1476 printf(" %u %s", obj->delta_depth, sha1_to_hex(bobj->idx.sha1));
1477 }
1478 putchar('\n');
1479 }
1480
1481 if (baseobjects)
1482 printf_ln(Q_("non delta: %d object",
1483 "non delta: %d objects",
1484 baseobjects),
1485 baseobjects);
1486 for (i = 0; i < deepest_delta; i++) {
1487 if (!chain_histogram[i])
1488 continue;
1489 printf_ln(Q_("chain length = %d: %lu object",
1490 "chain length = %d: %lu objects",
1491 chain_histogram[i]),
1492 i + 1,
1493 chain_histogram[i]);
1494 }
1495 }
1496
1497 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1498 {
1499 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
1500 const char *curr_index;
1501 const char *index_name = NULL, *pack_name = NULL;
1502 const char *keep_name = NULL, *keep_msg = NULL;
1503 char *index_name_buf = NULL, *keep_name_buf = NULL;
1504 struct pack_idx_entry **idx_objects;
1505 struct pack_idx_option opts;
1506 unsigned char pack_sha1[20];
1507 unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
1508
1509 if (argc == 2 && !strcmp(argv[1], "-h"))
1510 usage(index_pack_usage);
1511
1512 read_replace_refs = 0;
1513
1514 reset_pack_idx_option(&opts);
1515 git_config(git_index_pack_config, &opts);
1516 if (prefix && chdir(prefix))
1517 die(_("Cannot come back to cwd"));
1518
1519 for (i = 1; i < argc; i++) {
1520 const char *arg = argv[i];
1521
1522 if (*arg == '-') {
1523 if (!strcmp(arg, "--stdin")) {
1524 from_stdin = 1;
1525 } else if (!strcmp(arg, "--fix-thin")) {
1526 fix_thin_pack = 1;
1527 } else if (!strcmp(arg, "--strict")) {
1528 strict = 1;
1529 do_fsck_object = 1;
1530 } else if (!strcmp(arg, "--check-self-contained-and-connected")) {
1531 strict = 1;
1532 check_self_contained_and_connected = 1;
1533 } else if (!strcmp(arg, "--verify")) {
1534 verify = 1;
1535 } else if (!strcmp(arg, "--verify-stat")) {
1536 verify = 1;
1537 show_stat = 1;
1538 } else if (!strcmp(arg, "--verify-stat-only")) {
1539 verify = 1;
1540 show_stat = 1;
1541 stat_only = 1;
1542 } else if (!strcmp(arg, "--keep")) {
1543 keep_msg = "";
1544 } else if (starts_with(arg, "--keep=")) {
1545 keep_msg = arg + 7;
1546 } else if (starts_with(arg, "--threads=")) {
1547 char *end;
1548 nr_threads = strtoul(arg+10, &end, 0);
1549 if (!arg[10] || *end || nr_threads < 0)
1550 usage(index_pack_usage);
1551 #ifdef NO_PTHREADS
1552 if (nr_threads != 1)
1553 warning(_("no threads support, "
1554 "ignoring %s"), arg);
1555 nr_threads = 1;
1556 #endif
1557 } else if (starts_with(arg, "--pack_header=")) {
1558 struct pack_header *hdr;
1559 char *c;
1560
1561 hdr = (struct pack_header *)input_buffer;
1562 hdr->hdr_signature = htonl(PACK_SIGNATURE);
1563 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
1564 if (*c != ',')
1565 die(_("bad %s"), arg);
1566 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
1567 if (*c)
1568 die(_("bad %s"), arg);
1569 input_len = sizeof(*hdr);
1570 } else if (!strcmp(arg, "-v")) {
1571 verbose = 1;
1572 } else if (!strcmp(arg, "-o")) {
1573 if (index_name || (i+1) >= argc)
1574 usage(index_pack_usage);
1575 index_name = argv[++i];
1576 } else if (starts_with(arg, "--index-version=")) {
1577 char *c;
1578 opts.version = strtoul(arg + 16, &c, 10);
1579 if (opts.version > 2)
1580 die(_("bad %s"), arg);
1581 if (*c == ',')
1582 opts.off32_limit = strtoul(c+1, &c, 0);
1583 if (*c || opts.off32_limit & 0x80000000)
1584 die(_("bad %s"), arg);
1585 } else
1586 usage(index_pack_usage);
1587 continue;
1588 }
1589
1590 if (pack_name)
1591 usage(index_pack_usage);
1592 pack_name = arg;
1593 }
1594
1595 if (!pack_name && !from_stdin)
1596 usage(index_pack_usage);
1597 if (fix_thin_pack && !from_stdin)
1598 die(_("--fix-thin cannot be used without --stdin"));
1599 if (!index_name && pack_name) {
1600 int len = strlen(pack_name);
1601 if (!has_extension(pack_name, ".pack"))
1602 die(_("packfile name '%s' does not end with '.pack'"),
1603 pack_name);
1604 index_name_buf = xmalloc(len);
1605 memcpy(index_name_buf, pack_name, len - 5);
1606 strcpy(index_name_buf + len - 5, ".idx");
1607 index_name = index_name_buf;
1608 }
1609 if (keep_msg && !keep_name && pack_name) {
1610 int len = strlen(pack_name);
1611 if (!has_extension(pack_name, ".pack"))
1612 die(_("packfile name '%s' does not end with '.pack'"),
1613 pack_name);
1614 keep_name_buf = xmalloc(len);
1615 memcpy(keep_name_buf, pack_name, len - 5);
1616 strcpy(keep_name_buf + len - 5, ".keep");
1617 keep_name = keep_name_buf;
1618 }
1619 if (verify) {
1620 if (!index_name)
1621 die(_("--verify with no packfile name given"));
1622 read_idx_option(&opts, index_name);
1623 opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
1624 }
1625 if (strict)
1626 opts.flags |= WRITE_IDX_STRICT;
1627
1628 #ifndef NO_PTHREADS
1629 if (!nr_threads) {
1630 nr_threads = online_cpus();
1631 /* An experiment showed that more threads does not mean faster */
1632 if (nr_threads > 3)
1633 nr_threads = 3;
1634 }
1635 #endif
1636
1637 curr_pack = open_pack_file(pack_name);
1638 parse_pack_header();
1639 objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
1640 deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
1641 parse_pack_objects(pack_sha1);
1642 resolve_deltas();
1643 conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
1644 free(deltas);
1645 if (strict)
1646 foreign_nr = check_objects();
1647
1648 if (show_stat)
1649 show_pack_info(stat_only);
1650
1651 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1652 for (i = 0; i < nr_objects; i++)
1653 idx_objects[i] = &objects[i].idx;
1654 curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_sha1);
1655 free(idx_objects);
1656
1657 if (!verify)
1658 final(pack_name, curr_pack,
1659 index_name, curr_index,
1660 keep_name, keep_msg,
1661 pack_sha1);
1662 else
1663 close(input_fd);
1664 free(objects);
1665 free(index_name_buf);
1666 free(keep_name_buf);
1667 if (pack_name == NULL)
1668 free((void *) curr_pack);
1669 if (index_name == NULL)
1670 free((void *) curr_index);
1671
1672 /*
1673 * Let the caller know this pack is not self contained
1674 */
1675 if (check_self_contained_and_connected && foreign_nr)
1676 return 1;
1677
1678 return 0;
1679 }
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