1b5d83afeffce2aef22e4bcaf6f2ba051f390854
[git/git.git] / builtin / index-pack.c
1 #include "cache.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
13 static const char index_pack_usage[] =
14 "git index-pack [-v] [-o <index-file>] [ --keep | --keep=<msg> ] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
15
16 struct object_entry
17 {
18 struct pack_idx_entry idx;
19 unsigned long size;
20 unsigned int hdr_size;
21 enum object_type type;
22 enum object_type real_type;
23 };
24
25 union delta_base {
26 unsigned char sha1[20];
27 off_t offset;
28 };
29
30 struct base_data {
31 struct base_data *base;
32 struct base_data *child;
33 struct object_entry *obj;
34 void *data;
35 unsigned long size;
36 };
37
38 /*
39 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
40 * to memcmp() only the first 20 bytes.
41 */
42 #define UNION_BASE_SZ 20
43
44 #define FLAG_LINK (1u<<20)
45 #define FLAG_CHECKED (1u<<21)
46
47 struct delta_entry
48 {
49 union delta_base base;
50 int obj_no;
51 };
52
53 static struct object_entry *objects;
54 static struct delta_entry *deltas;
55 static struct base_data *base_cache;
56 static size_t base_cache_used;
57 static int nr_objects;
58 static int nr_deltas;
59 static int nr_resolved_deltas;
60
61 static int from_stdin;
62 static int strict;
63 static int verbose;
64
65 static struct progress *progress;
66
67 /* We always read in 4kB chunks. */
68 static unsigned char input_buffer[4096];
69 static unsigned int input_offset, input_len;
70 static off_t consumed_bytes;
71 static git_SHA_CTX input_ctx;
72 static uint32_t input_crc32;
73 static int input_fd, output_fd, pack_fd;
74
75 static int mark_link(struct object *obj, int type, void *data)
76 {
77 if (!obj)
78 return -1;
79
80 if (type != OBJ_ANY && obj->type != type)
81 die("object type mismatch at %s", sha1_to_hex(obj->sha1));
82
83 obj->flags |= FLAG_LINK;
84 return 0;
85 }
86
87 /* The content of each linked object must have been checked
88 or it must be already present in the object database */
89 static void check_object(struct object *obj)
90 {
91 if (!obj)
92 return;
93
94 if (!(obj->flags & FLAG_LINK))
95 return;
96
97 if (!(obj->flags & FLAG_CHECKED)) {
98 unsigned long size;
99 int type = sha1_object_info(obj->sha1, &size);
100 if (type != obj->type || type <= 0)
101 die("object of unexpected type");
102 obj->flags |= FLAG_CHECKED;
103 return;
104 }
105 }
106
107 static void check_objects(void)
108 {
109 unsigned i, max;
110
111 max = get_max_object_index();
112 for (i = 0; i < max; i++)
113 check_object(get_indexed_object(i));
114 }
115
116
117 /* Discard current buffer used content. */
118 static void flush(void)
119 {
120 if (input_offset) {
121 if (output_fd >= 0)
122 write_or_die(output_fd, input_buffer, input_offset);
123 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
124 memmove(input_buffer, input_buffer + input_offset, input_len);
125 input_offset = 0;
126 }
127 }
128
129 /*
130 * Make sure at least "min" bytes are available in the buffer, and
131 * return the pointer to the buffer.
132 */
133 static void *fill(int min)
134 {
135 if (min <= input_len)
136 return input_buffer + input_offset;
137 if (min > sizeof(input_buffer))
138 die("cannot fill %d bytes", min);
139 flush();
140 do {
141 ssize_t ret = xread(input_fd, input_buffer + input_len,
142 sizeof(input_buffer) - input_len);
143 if (ret <= 0) {
144 if (!ret)
145 die("early EOF");
146 die_errno("read error on input");
147 }
148 input_len += ret;
149 if (from_stdin)
150 display_throughput(progress, consumed_bytes + input_len);
151 } while (input_len < min);
152 return input_buffer;
153 }
154
155 static void use(int bytes)
156 {
157 if (bytes > input_len)
158 die("used more bytes than were available");
159 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
160 input_len -= bytes;
161 input_offset += bytes;
162
163 /* make sure off_t is sufficiently large not to wrap */
164 if (signed_add_overflows(consumed_bytes, bytes))
165 die("pack too large for current definition of off_t");
166 consumed_bytes += bytes;
167 }
168
169 static const char *open_pack_file(const char *pack_name)
170 {
171 if (from_stdin) {
172 input_fd = 0;
173 if (!pack_name) {
174 static char tmpfile[PATH_MAX];
175 output_fd = odb_mkstemp(tmpfile, sizeof(tmpfile),
176 "pack/tmp_pack_XXXXXX");
177 pack_name = xstrdup(tmpfile);
178 } else
179 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
180 if (output_fd < 0)
181 die_errno("unable to create '%s'", pack_name);
182 pack_fd = output_fd;
183 } else {
184 input_fd = open(pack_name, O_RDONLY);
185 if (input_fd < 0)
186 die_errno("cannot open packfile '%s'", pack_name);
187 output_fd = -1;
188 pack_fd = input_fd;
189 }
190 git_SHA1_Init(&input_ctx);
191 return pack_name;
192 }
193
194 static void parse_pack_header(void)
195 {
196 struct pack_header *hdr = fill(sizeof(struct pack_header));
197
198 /* Header consistency check */
199 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
200 die("pack signature mismatch");
201 if (!pack_version_ok(hdr->hdr_version))
202 die("pack version %"PRIu32" unsupported",
203 ntohl(hdr->hdr_version));
204
205 nr_objects = ntohl(hdr->hdr_entries);
206 use(sizeof(struct pack_header));
207 }
208
209 static NORETURN void bad_object(unsigned long offset, const char *format,
210 ...) __attribute__((format (printf, 2, 3)));
211
212 static void bad_object(unsigned long offset, const char *format, ...)
213 {
214 va_list params;
215 char buf[1024];
216
217 va_start(params, format);
218 vsnprintf(buf, sizeof(buf), format, params);
219 va_end(params);
220 die("pack has bad object at offset %lu: %s", offset, buf);
221 }
222
223 static void free_base_data(struct base_data *c)
224 {
225 if (c->data) {
226 free(c->data);
227 c->data = NULL;
228 base_cache_used -= c->size;
229 }
230 }
231
232 static void prune_base_data(struct base_data *retain)
233 {
234 struct base_data *b;
235 for (b = base_cache;
236 base_cache_used > delta_base_cache_limit && b;
237 b = b->child) {
238 if (b->data && b != retain)
239 free_base_data(b);
240 }
241 }
242
243 static void link_base_data(struct base_data *base, struct base_data *c)
244 {
245 if (base)
246 base->child = c;
247 else
248 base_cache = c;
249
250 c->base = base;
251 c->child = NULL;
252 if (c->data)
253 base_cache_used += c->size;
254 prune_base_data(c);
255 }
256
257 static void unlink_base_data(struct base_data *c)
258 {
259 struct base_data *base = c->base;
260 if (base)
261 base->child = NULL;
262 else
263 base_cache = NULL;
264 free_base_data(c);
265 }
266
267 static void *unpack_entry_data(unsigned long offset, unsigned long size)
268 {
269 int status;
270 z_stream stream;
271 void *buf = xmalloc(size);
272
273 memset(&stream, 0, sizeof(stream));
274 git_inflate_init(&stream);
275 stream.next_out = buf;
276 stream.avail_out = size;
277
278 do {
279 stream.next_in = fill(1);
280 stream.avail_in = input_len;
281 status = git_inflate(&stream, 0);
282 use(input_len - stream.avail_in);
283 } while (status == Z_OK);
284 if (stream.total_out != size || status != Z_STREAM_END)
285 bad_object(offset, "inflate returned %d", status);
286 git_inflate_end(&stream);
287 return buf;
288 }
289
290 static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
291 {
292 unsigned char *p;
293 unsigned long size, c;
294 off_t base_offset;
295 unsigned shift;
296 void *data;
297
298 obj->idx.offset = consumed_bytes;
299 input_crc32 = crc32(0, Z_NULL, 0);
300
301 p = fill(1);
302 c = *p;
303 use(1);
304 obj->type = (c >> 4) & 7;
305 size = (c & 15);
306 shift = 4;
307 while (c & 0x80) {
308 p = fill(1);
309 c = *p;
310 use(1);
311 size += (c & 0x7f) << shift;
312 shift += 7;
313 }
314 obj->size = size;
315
316 switch (obj->type) {
317 case OBJ_REF_DELTA:
318 hashcpy(delta_base->sha1, fill(20));
319 use(20);
320 break;
321 case OBJ_OFS_DELTA:
322 memset(delta_base, 0, sizeof(*delta_base));
323 p = fill(1);
324 c = *p;
325 use(1);
326 base_offset = c & 127;
327 while (c & 128) {
328 base_offset += 1;
329 if (!base_offset || MSB(base_offset, 7))
330 bad_object(obj->idx.offset, "offset value overflow for delta base object");
331 p = fill(1);
332 c = *p;
333 use(1);
334 base_offset = (base_offset << 7) + (c & 127);
335 }
336 delta_base->offset = obj->idx.offset - base_offset;
337 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
338 bad_object(obj->idx.offset, "delta base offset is out of bound");
339 break;
340 case OBJ_COMMIT:
341 case OBJ_TREE:
342 case OBJ_BLOB:
343 case OBJ_TAG:
344 break;
345 default:
346 bad_object(obj->idx.offset, "unknown object type %d", obj->type);
347 }
348 obj->hdr_size = consumed_bytes - obj->idx.offset;
349
350 data = unpack_entry_data(obj->idx.offset, obj->size);
351 obj->idx.crc32 = input_crc32;
352 return data;
353 }
354
355 static void *get_data_from_pack(struct object_entry *obj)
356 {
357 off_t from = obj[0].idx.offset + obj[0].hdr_size;
358 unsigned long len = obj[1].idx.offset - from;
359 unsigned char *data, *inbuf;
360 z_stream stream;
361 int status;
362
363 data = xmalloc(obj->size);
364 inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
365
366 memset(&stream, 0, sizeof(stream));
367 git_inflate_init(&stream);
368 stream.next_out = data;
369 stream.avail_out = obj->size;
370
371 do {
372 ssize_t n = (len < 64*1024) ? len : 64*1024;
373 n = pread(pack_fd, inbuf, n, from);
374 if (n < 0)
375 die_errno("cannot pread pack file");
376 if (!n)
377 die("premature end of pack file, %lu bytes missing", len);
378 from += n;
379 len -= n;
380 stream.next_in = inbuf;
381 stream.avail_in = n;
382 status = git_inflate(&stream, 0);
383 } while (len && status == Z_OK && !stream.avail_in);
384
385 /* This has been inflated OK when first encountered, so... */
386 if (status != Z_STREAM_END || stream.total_out != obj->size)
387 die("serious inflate inconsistency");
388
389 git_inflate_end(&stream);
390 free(inbuf);
391 return data;
392 }
393
394 static int compare_delta_bases(const union delta_base *base1,
395 const union delta_base *base2,
396 enum object_type type1,
397 enum object_type type2)
398 {
399 int cmp = type1 - type2;
400 if (cmp)
401 return cmp;
402 return memcmp(base1, base2, UNION_BASE_SZ);
403 }
404
405 static int find_delta(const union delta_base *base, enum object_type type)
406 {
407 int first = 0, last = nr_deltas;
408
409 while (first < last) {
410 int next = (first + last) / 2;
411 struct delta_entry *delta = &deltas[next];
412 int cmp;
413
414 cmp = compare_delta_bases(base, &delta->base,
415 type, objects[delta->obj_no].type);
416 if (!cmp)
417 return next;
418 if (cmp < 0) {
419 last = next;
420 continue;
421 }
422 first = next+1;
423 }
424 return -first-1;
425 }
426
427 static void find_delta_children(const union delta_base *base,
428 int *first_index, int *last_index,
429 enum object_type type)
430 {
431 int first = find_delta(base, type);
432 int last = first;
433 int end = nr_deltas - 1;
434
435 if (first < 0) {
436 *first_index = 0;
437 *last_index = -1;
438 return;
439 }
440 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
441 --first;
442 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
443 ++last;
444 *first_index = first;
445 *last_index = last;
446 }
447
448 static void sha1_object(const void *data, unsigned long size,
449 enum object_type type, unsigned char *sha1)
450 {
451 hash_sha1_file(data, size, typename(type), sha1);
452 if (has_sha1_file(sha1)) {
453 void *has_data;
454 enum object_type has_type;
455 unsigned long has_size;
456 has_data = read_sha1_file(sha1, &has_type, &has_size);
457 if (!has_data)
458 die("cannot read existing object %s", sha1_to_hex(sha1));
459 if (size != has_size || type != has_type ||
460 memcmp(data, has_data, size) != 0)
461 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
462 free(has_data);
463 }
464 if (strict) {
465 if (type == OBJ_BLOB) {
466 struct blob *blob = lookup_blob(sha1);
467 if (blob)
468 blob->object.flags |= FLAG_CHECKED;
469 else
470 die("invalid blob object %s", sha1_to_hex(sha1));
471 } else {
472 struct object *obj;
473 int eaten;
474 void *buf = (void *) data;
475
476 /*
477 * we do not need to free the memory here, as the
478 * buf is deleted by the caller.
479 */
480 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
481 if (!obj)
482 die("invalid %s", typename(type));
483 if (fsck_object(obj, 1, fsck_error_function))
484 die("Error in object");
485 if (fsck_walk(obj, mark_link, NULL))
486 die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
487
488 if (obj->type == OBJ_TREE) {
489 struct tree *item = (struct tree *) obj;
490 item->buffer = NULL;
491 }
492 if (obj->type == OBJ_COMMIT) {
493 struct commit *commit = (struct commit *) obj;
494 commit->buffer = NULL;
495 }
496 obj->flags |= FLAG_CHECKED;
497 }
498 }
499 }
500
501 static void *get_base_data(struct base_data *c)
502 {
503 if (!c->data) {
504 struct object_entry *obj = c->obj;
505
506 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
507 void *base = get_base_data(c->base);
508 void *raw = get_data_from_pack(obj);
509 c->data = patch_delta(
510 base, c->base->size,
511 raw, obj->size,
512 &c->size);
513 free(raw);
514 if (!c->data)
515 bad_object(obj->idx.offset, "failed to apply delta");
516 } else {
517 c->data = get_data_from_pack(obj);
518 c->size = obj->size;
519 }
520
521 base_cache_used += c->size;
522 prune_base_data(c);
523 }
524 return c->data;
525 }
526
527 static void resolve_delta(struct object_entry *delta_obj,
528 struct base_data *base, struct base_data *result)
529 {
530 void *base_data, *delta_data;
531
532 delta_obj->real_type = base->obj->real_type;
533 delta_data = get_data_from_pack(delta_obj);
534 base_data = get_base_data(base);
535 result->obj = delta_obj;
536 result->data = patch_delta(base_data, base->size,
537 delta_data, delta_obj->size, &result->size);
538 free(delta_data);
539 if (!result->data)
540 bad_object(delta_obj->idx.offset, "failed to apply delta");
541 sha1_object(result->data, result->size, delta_obj->real_type,
542 delta_obj->idx.sha1);
543 nr_resolved_deltas++;
544 }
545
546 static void find_unresolved_deltas(struct base_data *base,
547 struct base_data *prev_base)
548 {
549 int i, ref_first, ref_last, ofs_first, ofs_last;
550
551 /*
552 * This is a recursive function. Those brackets should help reducing
553 * stack usage by limiting the scope of the delta_base union.
554 */
555 {
556 union delta_base base_spec;
557
558 hashcpy(base_spec.sha1, base->obj->idx.sha1);
559 find_delta_children(&base_spec,
560 &ref_first, &ref_last, OBJ_REF_DELTA);
561
562 memset(&base_spec, 0, sizeof(base_spec));
563 base_spec.offset = base->obj->idx.offset;
564 find_delta_children(&base_spec,
565 &ofs_first, &ofs_last, OBJ_OFS_DELTA);
566 }
567
568 if (ref_last == -1 && ofs_last == -1) {
569 free(base->data);
570 return;
571 }
572
573 link_base_data(prev_base, base);
574
575 for (i = ref_first; i <= ref_last; i++) {
576 struct object_entry *child = objects + deltas[i].obj_no;
577 struct base_data result;
578
579 assert(child->real_type == OBJ_REF_DELTA);
580 resolve_delta(child, base, &result);
581 if (i == ref_last && ofs_last == -1)
582 free_base_data(base);
583 find_unresolved_deltas(&result, base);
584 }
585
586 for (i = ofs_first; i <= ofs_last; i++) {
587 struct object_entry *child = objects + deltas[i].obj_no;
588 struct base_data result;
589
590 assert(child->real_type == OBJ_OFS_DELTA);
591 resolve_delta(child, base, &result);
592 if (i == ofs_last)
593 free_base_data(base);
594 find_unresolved_deltas(&result, base);
595 }
596
597 unlink_base_data(base);
598 }
599
600 static int compare_delta_entry(const void *a, const void *b)
601 {
602 const struct delta_entry *delta_a = a;
603 const struct delta_entry *delta_b = b;
604
605 /* group by type (ref vs ofs) and then by value (sha-1 or offset) */
606 return compare_delta_bases(&delta_a->base, &delta_b->base,
607 objects[delta_a->obj_no].type,
608 objects[delta_b->obj_no].type);
609 }
610
611 /* Parse all objects and return the pack content SHA1 hash */
612 static void parse_pack_objects(unsigned char *sha1)
613 {
614 int i;
615 struct delta_entry *delta = deltas;
616 struct stat st;
617
618 /*
619 * First pass:
620 * - find locations of all objects;
621 * - calculate SHA1 of all non-delta objects;
622 * - remember base (SHA1 or offset) for all deltas.
623 */
624 if (verbose)
625 progress = start_progress(
626 from_stdin ? "Receiving objects" : "Indexing objects",
627 nr_objects);
628 for (i = 0; i < nr_objects; i++) {
629 struct object_entry *obj = &objects[i];
630 void *data = unpack_raw_entry(obj, &delta->base);
631 obj->real_type = obj->type;
632 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
633 nr_deltas++;
634 delta->obj_no = i;
635 delta++;
636 } else
637 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
638 free(data);
639 display_progress(progress, i+1);
640 }
641 objects[i].idx.offset = consumed_bytes;
642 stop_progress(&progress);
643
644 /* Check pack integrity */
645 flush();
646 git_SHA1_Final(sha1, &input_ctx);
647 if (hashcmp(fill(20), sha1))
648 die("pack is corrupted (SHA1 mismatch)");
649 use(20);
650
651 /* If input_fd is a file, we should have reached its end now. */
652 if (fstat(input_fd, &st))
653 die_errno("cannot fstat packfile");
654 if (S_ISREG(st.st_mode) &&
655 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
656 die("pack has junk at the end");
657
658 if (!nr_deltas)
659 return;
660
661 /* Sort deltas by base SHA1/offset for fast searching */
662 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
663 compare_delta_entry);
664
665 /*
666 * Second pass:
667 * - for all non-delta objects, look if it is used as a base for
668 * deltas;
669 * - if used as a base, uncompress the object and apply all deltas,
670 * recursively checking if the resulting object is used as a base
671 * for some more deltas.
672 */
673 if (verbose)
674 progress = start_progress("Resolving deltas", nr_deltas);
675 for (i = 0; i < nr_objects; i++) {
676 struct object_entry *obj = &objects[i];
677 struct base_data base_obj;
678
679 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
680 continue;
681 base_obj.obj = obj;
682 base_obj.data = NULL;
683 find_unresolved_deltas(&base_obj, NULL);
684 display_progress(progress, nr_resolved_deltas);
685 }
686 }
687
688 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
689 {
690 z_stream stream;
691 int status;
692 unsigned char outbuf[4096];
693
694 memset(&stream, 0, sizeof(stream));
695 deflateInit(&stream, zlib_compression_level);
696 stream.next_in = in;
697 stream.avail_in = size;
698
699 do {
700 stream.next_out = outbuf;
701 stream.avail_out = sizeof(outbuf);
702 status = deflate(&stream, Z_FINISH);
703 sha1write(f, outbuf, sizeof(outbuf) - stream.avail_out);
704 } while (status == Z_OK);
705
706 if (status != Z_STREAM_END)
707 die("unable to deflate appended object (%d)", status);
708 size = stream.total_out;
709 deflateEnd(&stream);
710 return size;
711 }
712
713 static struct object_entry *append_obj_to_pack(struct sha1file *f,
714 const unsigned char *sha1, void *buf,
715 unsigned long size, enum object_type type)
716 {
717 struct object_entry *obj = &objects[nr_objects++];
718 unsigned char header[10];
719 unsigned long s = size;
720 int n = 0;
721 unsigned char c = (type << 4) | (s & 15);
722 s >>= 4;
723 while (s) {
724 header[n++] = c | 0x80;
725 c = s & 0x7f;
726 s >>= 7;
727 }
728 header[n++] = c;
729 crc32_begin(f);
730 sha1write(f, header, n);
731 obj[0].size = size;
732 obj[0].hdr_size = n;
733 obj[0].type = type;
734 obj[0].real_type = type;
735 obj[1].idx.offset = obj[0].idx.offset + n;
736 obj[1].idx.offset += write_compressed(f, buf, size);
737 obj[0].idx.crc32 = crc32_end(f);
738 sha1flush(f);
739 hashcpy(obj->idx.sha1, sha1);
740 return obj;
741 }
742
743 static int delta_pos_compare(const void *_a, const void *_b)
744 {
745 struct delta_entry *a = *(struct delta_entry **)_a;
746 struct delta_entry *b = *(struct delta_entry **)_b;
747 return a->obj_no - b->obj_no;
748 }
749
750 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
751 {
752 struct delta_entry **sorted_by_pos;
753 int i, n = 0;
754
755 /*
756 * Since many unresolved deltas may well be themselves base objects
757 * for more unresolved deltas, we really want to include the
758 * smallest number of base objects that would cover as much delta
759 * as possible by picking the
760 * trunc deltas first, allowing for other deltas to resolve without
761 * additional base objects. Since most base objects are to be found
762 * before deltas depending on them, a good heuristic is to start
763 * resolving deltas in the same order as their position in the pack.
764 */
765 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
766 for (i = 0; i < nr_deltas; i++) {
767 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
768 continue;
769 sorted_by_pos[n++] = &deltas[i];
770 }
771 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
772
773 for (i = 0; i < n; i++) {
774 struct delta_entry *d = sorted_by_pos[i];
775 enum object_type type;
776 struct base_data base_obj;
777
778 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
779 continue;
780 base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size);
781 if (!base_obj.data)
782 continue;
783
784 if (check_sha1_signature(d->base.sha1, base_obj.data,
785 base_obj.size, typename(type)))
786 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
787 base_obj.obj = append_obj_to_pack(f, d->base.sha1,
788 base_obj.data, base_obj.size, type);
789 find_unresolved_deltas(&base_obj, NULL);
790 display_progress(progress, nr_resolved_deltas);
791 }
792 free(sorted_by_pos);
793 }
794
795 static void final(const char *final_pack_name, const char *curr_pack_name,
796 const char *final_index_name, const char *curr_index_name,
797 const char *keep_name, const char *keep_msg,
798 unsigned char *sha1)
799 {
800 const char *report = "pack";
801 char name[PATH_MAX];
802 int err;
803
804 if (!from_stdin) {
805 close(input_fd);
806 } else {
807 fsync_or_die(output_fd, curr_pack_name);
808 err = close(output_fd);
809 if (err)
810 die_errno("error while closing pack file");
811 }
812
813 if (keep_msg) {
814 int keep_fd, keep_msg_len = strlen(keep_msg);
815
816 if (!keep_name)
817 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
818 else
819 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
820
821 if (keep_fd < 0) {
822 if (errno != EEXIST)
823 die_errno("cannot write keep file '%s'",
824 keep_name);
825 } else {
826 if (keep_msg_len > 0) {
827 write_or_die(keep_fd, keep_msg, keep_msg_len);
828 write_or_die(keep_fd, "\n", 1);
829 }
830 if (close(keep_fd) != 0)
831 die_errno("cannot close written keep file '%s'",
832 keep_name);
833 report = "keep";
834 }
835 }
836
837 if (final_pack_name != curr_pack_name) {
838 if (!final_pack_name) {
839 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
840 get_object_directory(), sha1_to_hex(sha1));
841 final_pack_name = name;
842 }
843 if (move_temp_to_file(curr_pack_name, final_pack_name))
844 die("cannot store pack file");
845 } else if (from_stdin)
846 chmod(final_pack_name, 0444);
847
848 if (final_index_name != curr_index_name) {
849 if (!final_index_name) {
850 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
851 get_object_directory(), sha1_to_hex(sha1));
852 final_index_name = name;
853 }
854 if (move_temp_to_file(curr_index_name, final_index_name))
855 die("cannot store index file");
856 } else
857 chmod(final_index_name, 0444);
858
859 if (!from_stdin) {
860 printf("%s\n", sha1_to_hex(sha1));
861 } else {
862 char buf[48];
863 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
864 report, sha1_to_hex(sha1));
865 write_or_die(1, buf, len);
866
867 /*
868 * Let's just mimic git-unpack-objects here and write
869 * the last part of the input buffer to stdout.
870 */
871 while (input_len) {
872 err = xwrite(1, input_buffer + input_offset, input_len);
873 if (err <= 0)
874 break;
875 input_len -= err;
876 input_offset += err;
877 }
878 }
879 }
880
881 static int git_index_pack_config(const char *k, const char *v, void *cb)
882 {
883 if (!strcmp(k, "pack.indexversion")) {
884 pack_idx_default_version = git_config_int(k, v);
885 if (pack_idx_default_version > 2)
886 die("bad pack.indexversion=%"PRIu32,
887 pack_idx_default_version);
888 return 0;
889 }
890 return git_default_config(k, v, cb);
891 }
892
893 int cmd_index_pack(int argc, const char **argv, const char *prefix)
894 {
895 int i, fix_thin_pack = 0;
896 const char *curr_pack, *curr_index;
897 const char *index_name = NULL, *pack_name = NULL;
898 const char *keep_name = NULL, *keep_msg = NULL;
899 char *index_name_buf = NULL, *keep_name_buf = NULL;
900 struct pack_idx_entry **idx_objects;
901 unsigned char pack_sha1[20];
902
903 if (argc == 2 && !strcmp(argv[1], "-h"))
904 usage(index_pack_usage);
905
906 read_replace_refs = 0;
907
908 git_config(git_index_pack_config, NULL);
909 if (prefix && chdir(prefix))
910 die("Cannot come back to cwd");
911
912 for (i = 1; i < argc; i++) {
913 const char *arg = argv[i];
914
915 if (*arg == '-') {
916 if (!strcmp(arg, "--stdin")) {
917 from_stdin = 1;
918 } else if (!strcmp(arg, "--fix-thin")) {
919 fix_thin_pack = 1;
920 } else if (!strcmp(arg, "--strict")) {
921 strict = 1;
922 } else if (!strcmp(arg, "--keep")) {
923 keep_msg = "";
924 } else if (!prefixcmp(arg, "--keep=")) {
925 keep_msg = arg + 7;
926 } else if (!prefixcmp(arg, "--pack_header=")) {
927 struct pack_header *hdr;
928 char *c;
929
930 hdr = (struct pack_header *)input_buffer;
931 hdr->hdr_signature = htonl(PACK_SIGNATURE);
932 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
933 if (*c != ',')
934 die("bad %s", arg);
935 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
936 if (*c)
937 die("bad %s", arg);
938 input_len = sizeof(*hdr);
939 } else if (!strcmp(arg, "-v")) {
940 verbose = 1;
941 } else if (!strcmp(arg, "-o")) {
942 if (index_name || (i+1) >= argc)
943 usage(index_pack_usage);
944 index_name = argv[++i];
945 } else if (!prefixcmp(arg, "--index-version=")) {
946 char *c;
947 pack_idx_default_version = strtoul(arg + 16, &c, 10);
948 if (pack_idx_default_version > 2)
949 die("bad %s", arg);
950 if (*c == ',')
951 pack_idx_off32_limit = strtoul(c+1, &c, 0);
952 if (*c || pack_idx_off32_limit & 0x80000000)
953 die("bad %s", arg);
954 } else
955 usage(index_pack_usage);
956 continue;
957 }
958
959 if (pack_name)
960 usage(index_pack_usage);
961 pack_name = arg;
962 }
963
964 if (!pack_name && !from_stdin)
965 usage(index_pack_usage);
966 if (fix_thin_pack && !from_stdin)
967 die("--fix-thin cannot be used without --stdin");
968 if (!index_name && pack_name) {
969 int len = strlen(pack_name);
970 if (!has_extension(pack_name, ".pack"))
971 die("packfile name '%s' does not end with '.pack'",
972 pack_name);
973 index_name_buf = xmalloc(len);
974 memcpy(index_name_buf, pack_name, len - 5);
975 strcpy(index_name_buf + len - 5, ".idx");
976 index_name = index_name_buf;
977 }
978 if (keep_msg && !keep_name && pack_name) {
979 int len = strlen(pack_name);
980 if (!has_extension(pack_name, ".pack"))
981 die("packfile name '%s' does not end with '.pack'",
982 pack_name);
983 keep_name_buf = xmalloc(len);
984 memcpy(keep_name_buf, pack_name, len - 5);
985 strcpy(keep_name_buf + len - 5, ".keep");
986 keep_name = keep_name_buf;
987 }
988
989 curr_pack = open_pack_file(pack_name);
990 parse_pack_header();
991 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
992 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
993 parse_pack_objects(pack_sha1);
994 if (nr_deltas == nr_resolved_deltas) {
995 stop_progress(&progress);
996 /* Flush remaining pack final 20-byte SHA1. */
997 flush();
998 } else {
999 if (fix_thin_pack) {
1000 struct sha1file *f;
1001 unsigned char read_sha1[20], tail_sha1[20];
1002 char msg[48];
1003 int nr_unresolved = nr_deltas - nr_resolved_deltas;
1004 int nr_objects_initial = nr_objects;
1005 if (nr_unresolved <= 0)
1006 die("confusion beyond insanity");
1007 objects = xrealloc(objects,
1008 (nr_objects + nr_unresolved + 1)
1009 * sizeof(*objects));
1010 f = sha1fd(output_fd, curr_pack);
1011 fix_unresolved_deltas(f, nr_unresolved);
1012 sprintf(msg, "completed with %d local objects",
1013 nr_objects - nr_objects_initial);
1014 stop_progress_msg(&progress, msg);
1015 sha1close(f, tail_sha1, 0);
1016 hashcpy(read_sha1, pack_sha1);
1017 fixup_pack_header_footer(output_fd, pack_sha1,
1018 curr_pack, nr_objects,
1019 read_sha1, consumed_bytes-20);
1020 if (hashcmp(read_sha1, tail_sha1) != 0)
1021 die("Unexpected tail checksum for %s "
1022 "(disk corruption?)", curr_pack);
1023 }
1024 if (nr_deltas != nr_resolved_deltas)
1025 die("pack has %d unresolved deltas",
1026 nr_deltas - nr_resolved_deltas);
1027 }
1028 free(deltas);
1029 if (strict)
1030 check_objects();
1031
1032 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1033 for (i = 0; i < nr_objects; i++)
1034 idx_objects[i] = &objects[i].idx;
1035 curr_index = write_idx_file(index_name, idx_objects, nr_objects, pack_sha1);
1036 free(idx_objects);
1037
1038 final(pack_name, curr_pack,
1039 index_name, curr_index,
1040 keep_name, keep_msg,
1041 pack_sha1);
1042 free(objects);
1043 free(index_name_buf);
1044 free(keep_name_buf);
1045 if (pack_name == NULL)
1046 free((void *) curr_pack);
1047 if (index_name == NULL)
1048 free((void *) curr_index);
1049
1050 return 0;
1051 }