4308abb60e8cf750f3c3a38c2100f910b0bcbdf9
[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 (consumed_bytes > 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 find_delta(const union delta_base *base)
395 {
396 int first = 0, last = nr_deltas;
397
398 while (first < last) {
399 int next = (first + last) / 2;
400 struct delta_entry *delta = &deltas[next];
401 int cmp;
402
403 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
404 if (!cmp)
405 return next;
406 if (cmp < 0) {
407 last = next;
408 continue;
409 }
410 first = next+1;
411 }
412 return -first-1;
413 }
414
415 static void find_delta_children(const union delta_base *base,
416 int *first_index, int *last_index)
417 {
418 int first = find_delta(base);
419 int last = first;
420 int end = nr_deltas - 1;
421
422 if (first < 0) {
423 *first_index = 0;
424 *last_index = -1;
425 return;
426 }
427 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
428 --first;
429 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
430 ++last;
431 *first_index = first;
432 *last_index = last;
433 }
434
435 static void sha1_object(const void *data, unsigned long size,
436 enum object_type type, unsigned char *sha1)
437 {
438 hash_sha1_file(data, size, typename(type), sha1);
439 if (has_sha1_file(sha1)) {
440 void *has_data;
441 enum object_type has_type;
442 unsigned long has_size;
443 has_data = read_sha1_file(sha1, &has_type, &has_size);
444 if (!has_data)
445 die("cannot read existing object %s", sha1_to_hex(sha1));
446 if (size != has_size || type != has_type ||
447 memcmp(data, has_data, size) != 0)
448 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
449 free(has_data);
450 }
451 if (strict) {
452 if (type == OBJ_BLOB) {
453 struct blob *blob = lookup_blob(sha1);
454 if (blob)
455 blob->object.flags |= FLAG_CHECKED;
456 else
457 die("invalid blob object %s", sha1_to_hex(sha1));
458 } else {
459 struct object *obj;
460 int eaten;
461 void *buf = (void *) data;
462
463 /*
464 * we do not need to free the memory here, as the
465 * buf is deleted by the caller.
466 */
467 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
468 if (!obj)
469 die("invalid %s", typename(type));
470 if (fsck_object(obj, 1, fsck_error_function))
471 die("Error in object");
472 if (fsck_walk(obj, mark_link, NULL))
473 die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
474
475 if (obj->type == OBJ_TREE) {
476 struct tree *item = (struct tree *) obj;
477 item->buffer = NULL;
478 }
479 if (obj->type == OBJ_COMMIT) {
480 struct commit *commit = (struct commit *) obj;
481 commit->buffer = NULL;
482 }
483 obj->flags |= FLAG_CHECKED;
484 }
485 }
486 }
487
488 static void *get_base_data(struct base_data *c)
489 {
490 if (!c->data) {
491 struct object_entry *obj = c->obj;
492
493 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
494 void *base = get_base_data(c->base);
495 void *raw = get_data_from_pack(obj);
496 c->data = patch_delta(
497 base, c->base->size,
498 raw, obj->size,
499 &c->size);
500 free(raw);
501 if (!c->data)
502 bad_object(obj->idx.offset, "failed to apply delta");
503 } else {
504 c->data = get_data_from_pack(obj);
505 c->size = obj->size;
506 }
507
508 base_cache_used += c->size;
509 prune_base_data(c);
510 }
511 return c->data;
512 }
513
514 static void resolve_delta(struct object_entry *delta_obj,
515 struct base_data *base, struct base_data *result)
516 {
517 void *base_data, *delta_data;
518
519 delta_obj->real_type = base->obj->real_type;
520 delta_data = get_data_from_pack(delta_obj);
521 base_data = get_base_data(base);
522 result->obj = delta_obj;
523 result->data = patch_delta(base_data, base->size,
524 delta_data, delta_obj->size, &result->size);
525 free(delta_data);
526 if (!result->data)
527 bad_object(delta_obj->idx.offset, "failed to apply delta");
528 sha1_object(result->data, result->size, delta_obj->real_type,
529 delta_obj->idx.sha1);
530 nr_resolved_deltas++;
531 }
532
533 static void find_unresolved_deltas(struct base_data *base,
534 struct base_data *prev_base)
535 {
536 int i, ref_first, ref_last, ofs_first, ofs_last;
537
538 /*
539 * This is a recursive function. Those brackets should help reducing
540 * stack usage by limiting the scope of the delta_base union.
541 */
542 {
543 union delta_base base_spec;
544
545 hashcpy(base_spec.sha1, base->obj->idx.sha1);
546 find_delta_children(&base_spec, &ref_first, &ref_last);
547
548 memset(&base_spec, 0, sizeof(base_spec));
549 base_spec.offset = base->obj->idx.offset;
550 find_delta_children(&base_spec, &ofs_first, &ofs_last);
551 }
552
553 if (ref_last == -1 && ofs_last == -1) {
554 free(base->data);
555 return;
556 }
557
558 link_base_data(prev_base, base);
559
560 for (i = ref_first; i <= ref_last; i++) {
561 struct object_entry *child = objects + deltas[i].obj_no;
562 if (child->real_type == OBJ_REF_DELTA) {
563 struct base_data result;
564 resolve_delta(child, base, &result);
565 if (i == ref_last && ofs_last == -1)
566 free_base_data(base);
567 find_unresolved_deltas(&result, base);
568 }
569 }
570
571 for (i = ofs_first; i <= ofs_last; i++) {
572 struct object_entry *child = objects + deltas[i].obj_no;
573 if (child->real_type == OBJ_OFS_DELTA) {
574 struct base_data result;
575 resolve_delta(child, base, &result);
576 if (i == ofs_last)
577 free_base_data(base);
578 find_unresolved_deltas(&result, base);
579 }
580 }
581
582 unlink_base_data(base);
583 }
584
585 static int compare_delta_entry(const void *a, const void *b)
586 {
587 const struct delta_entry *delta_a = a;
588 const struct delta_entry *delta_b = b;
589 return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
590 }
591
592 /* Parse all objects and return the pack content SHA1 hash */
593 static void parse_pack_objects(unsigned char *sha1)
594 {
595 int i;
596 struct delta_entry *delta = deltas;
597 struct stat st;
598
599 /*
600 * First pass:
601 * - find locations of all objects;
602 * - calculate SHA1 of all non-delta objects;
603 * - remember base (SHA1 or offset) for all deltas.
604 */
605 if (verbose)
606 progress = start_progress(
607 from_stdin ? "Receiving objects" : "Indexing objects",
608 nr_objects);
609 for (i = 0; i < nr_objects; i++) {
610 struct object_entry *obj = &objects[i];
611 void *data = unpack_raw_entry(obj, &delta->base);
612 obj->real_type = obj->type;
613 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
614 nr_deltas++;
615 delta->obj_no = i;
616 delta++;
617 } else
618 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
619 free(data);
620 display_progress(progress, i+1);
621 }
622 objects[i].idx.offset = consumed_bytes;
623 stop_progress(&progress);
624
625 /* Check pack integrity */
626 flush();
627 git_SHA1_Final(sha1, &input_ctx);
628 if (hashcmp(fill(20), sha1))
629 die("pack is corrupted (SHA1 mismatch)");
630 use(20);
631
632 /* If input_fd is a file, we should have reached its end now. */
633 if (fstat(input_fd, &st))
634 die_errno("cannot fstat packfile");
635 if (S_ISREG(st.st_mode) &&
636 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
637 die("pack has junk at the end");
638
639 if (!nr_deltas)
640 return;
641
642 /* Sort deltas by base SHA1/offset for fast searching */
643 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
644 compare_delta_entry);
645
646 /*
647 * Second pass:
648 * - for all non-delta objects, look if it is used as a base for
649 * deltas;
650 * - if used as a base, uncompress the object and apply all deltas,
651 * recursively checking if the resulting object is used as a base
652 * for some more deltas.
653 */
654 if (verbose)
655 progress = start_progress("Resolving deltas", nr_deltas);
656 for (i = 0; i < nr_objects; i++) {
657 struct object_entry *obj = &objects[i];
658 struct base_data base_obj;
659
660 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
661 continue;
662 base_obj.obj = obj;
663 base_obj.data = NULL;
664 find_unresolved_deltas(&base_obj, NULL);
665 display_progress(progress, nr_resolved_deltas);
666 }
667 }
668
669 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
670 {
671 z_stream stream;
672 unsigned long maxsize;
673 void *out;
674
675 memset(&stream, 0, sizeof(stream));
676 deflateInit(&stream, zlib_compression_level);
677 maxsize = deflateBound(&stream, size);
678 out = xmalloc(maxsize);
679
680 /* Compress it */
681 stream.next_in = in;
682 stream.avail_in = size;
683 stream.next_out = out;
684 stream.avail_out = maxsize;
685 while (deflate(&stream, Z_FINISH) == Z_OK);
686 deflateEnd(&stream);
687
688 size = stream.total_out;
689 sha1write(f, out, size);
690 free(out);
691 return size;
692 }
693
694 static struct object_entry *append_obj_to_pack(struct sha1file *f,
695 const unsigned char *sha1, void *buf,
696 unsigned long size, enum object_type type)
697 {
698 struct object_entry *obj = &objects[nr_objects++];
699 unsigned char header[10];
700 unsigned long s = size;
701 int n = 0;
702 unsigned char c = (type << 4) | (s & 15);
703 s >>= 4;
704 while (s) {
705 header[n++] = c | 0x80;
706 c = s & 0x7f;
707 s >>= 7;
708 }
709 header[n++] = c;
710 crc32_begin(f);
711 sha1write(f, header, n);
712 obj[0].size = size;
713 obj[0].hdr_size = n;
714 obj[0].type = type;
715 obj[0].real_type = type;
716 obj[1].idx.offset = obj[0].idx.offset + n;
717 obj[1].idx.offset += write_compressed(f, buf, size);
718 obj[0].idx.crc32 = crc32_end(f);
719 sha1flush(f);
720 hashcpy(obj->idx.sha1, sha1);
721 return obj;
722 }
723
724 static int delta_pos_compare(const void *_a, const void *_b)
725 {
726 struct delta_entry *a = *(struct delta_entry **)_a;
727 struct delta_entry *b = *(struct delta_entry **)_b;
728 return a->obj_no - b->obj_no;
729 }
730
731 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
732 {
733 struct delta_entry **sorted_by_pos;
734 int i, n = 0;
735
736 /*
737 * Since many unresolved deltas may well be themselves base objects
738 * for more unresolved deltas, we really want to include the
739 * smallest number of base objects that would cover as much delta
740 * as possible by picking the
741 * trunc deltas first, allowing for other deltas to resolve without
742 * additional base objects. Since most base objects are to be found
743 * before deltas depending on them, a good heuristic is to start
744 * resolving deltas in the same order as their position in the pack.
745 */
746 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
747 for (i = 0; i < nr_deltas; i++) {
748 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
749 continue;
750 sorted_by_pos[n++] = &deltas[i];
751 }
752 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
753
754 for (i = 0; i < n; i++) {
755 struct delta_entry *d = sorted_by_pos[i];
756 enum object_type type;
757 struct base_data base_obj;
758
759 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
760 continue;
761 base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size);
762 if (!base_obj.data)
763 continue;
764
765 if (check_sha1_signature(d->base.sha1, base_obj.data,
766 base_obj.size, typename(type)))
767 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
768 base_obj.obj = append_obj_to_pack(f, d->base.sha1,
769 base_obj.data, base_obj.size, type);
770 find_unresolved_deltas(&base_obj, NULL);
771 display_progress(progress, nr_resolved_deltas);
772 }
773 free(sorted_by_pos);
774 }
775
776 static void final(const char *final_pack_name, const char *curr_pack_name,
777 const char *final_index_name, const char *curr_index_name,
778 const char *keep_name, const char *keep_msg,
779 unsigned char *sha1)
780 {
781 const char *report = "pack";
782 char name[PATH_MAX];
783 int err;
784
785 if (!from_stdin) {
786 close(input_fd);
787 } else {
788 fsync_or_die(output_fd, curr_pack_name);
789 err = close(output_fd);
790 if (err)
791 die_errno("error while closing pack file");
792 }
793
794 if (keep_msg) {
795 int keep_fd, keep_msg_len = strlen(keep_msg);
796
797 if (!keep_name)
798 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
799 else
800 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
801
802 if (keep_fd < 0) {
803 if (errno != EEXIST)
804 die_errno("cannot write keep file '%s'",
805 keep_name);
806 } else {
807 if (keep_msg_len > 0) {
808 write_or_die(keep_fd, keep_msg, keep_msg_len);
809 write_or_die(keep_fd, "\n", 1);
810 }
811 if (close(keep_fd) != 0)
812 die_errno("cannot close written keep file '%s'",
813 keep_name);
814 report = "keep";
815 }
816 }
817
818 if (final_pack_name != curr_pack_name) {
819 if (!final_pack_name) {
820 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
821 get_object_directory(), sha1_to_hex(sha1));
822 final_pack_name = name;
823 }
824 if (move_temp_to_file(curr_pack_name, final_pack_name))
825 die("cannot store pack file");
826 } else if (from_stdin)
827 chmod(final_pack_name, 0444);
828
829 if (final_index_name != curr_index_name) {
830 if (!final_index_name) {
831 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
832 get_object_directory(), sha1_to_hex(sha1));
833 final_index_name = name;
834 }
835 if (move_temp_to_file(curr_index_name, final_index_name))
836 die("cannot store index file");
837 } else
838 chmod(final_index_name, 0444);
839
840 if (!from_stdin) {
841 printf("%s\n", sha1_to_hex(sha1));
842 } else {
843 char buf[48];
844 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
845 report, sha1_to_hex(sha1));
846 write_or_die(1, buf, len);
847
848 /*
849 * Let's just mimic git-unpack-objects here and write
850 * the last part of the input buffer to stdout.
851 */
852 while (input_len) {
853 err = xwrite(1, input_buffer + input_offset, input_len);
854 if (err <= 0)
855 break;
856 input_len -= err;
857 input_offset += err;
858 }
859 }
860 }
861
862 static int git_index_pack_config(const char *k, const char *v, void *cb)
863 {
864 if (!strcmp(k, "pack.indexversion")) {
865 pack_idx_default_version = git_config_int(k, v);
866 if (pack_idx_default_version > 2)
867 die("bad pack.indexversion=%"PRIu32,
868 pack_idx_default_version);
869 return 0;
870 }
871 return git_default_config(k, v, cb);
872 }
873
874 int cmd_index_pack(int argc, const char **argv, const char *prefix)
875 {
876 int i, fix_thin_pack = 0;
877 const char *curr_pack, *curr_index;
878 const char *index_name = NULL, *pack_name = NULL;
879 const char *keep_name = NULL, *keep_msg = NULL;
880 char *index_name_buf = NULL, *keep_name_buf = NULL;
881 struct pack_idx_entry **idx_objects;
882 unsigned char pack_sha1[20];
883
884 if (argc == 2 && !strcmp(argv[1], "-h"))
885 usage(index_pack_usage);
886
887 /*
888 * We wish to read the repository's config file if any, and
889 * for that it is necessary to call setup_git_directory_gently().
890 * However if the cwd was inside .git/objects/pack/ then we need
891 * to go back there or all the pack name arguments will be wrong.
892 * And in that case we cannot rely on any prefix returned by
893 * setup_git_directory_gently() either.
894 */
895 {
896 char cwd[PATH_MAX+1];
897 int nongit;
898
899 if (!getcwd(cwd, sizeof(cwd)-1))
900 die("Unable to get current working directory");
901 setup_git_directory_gently(&nongit);
902 git_config(git_index_pack_config, NULL);
903 if (chdir(cwd))
904 die("Cannot come back to cwd");
905 }
906
907 for (i = 1; i < argc; i++) {
908 const char *arg = argv[i];
909
910 if (*arg == '-') {
911 if (!strcmp(arg, "--stdin")) {
912 from_stdin = 1;
913 } else if (!strcmp(arg, "--fix-thin")) {
914 fix_thin_pack = 1;
915 } else if (!strcmp(arg, "--strict")) {
916 strict = 1;
917 } else if (!strcmp(arg, "--keep")) {
918 keep_msg = "";
919 } else if (!prefixcmp(arg, "--keep=")) {
920 keep_msg = arg + 7;
921 } else if (!prefixcmp(arg, "--pack_header=")) {
922 struct pack_header *hdr;
923 char *c;
924
925 hdr = (struct pack_header *)input_buffer;
926 hdr->hdr_signature = htonl(PACK_SIGNATURE);
927 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
928 if (*c != ',')
929 die("bad %s", arg);
930 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
931 if (*c)
932 die("bad %s", arg);
933 input_len = sizeof(*hdr);
934 } else if (!strcmp(arg, "-v")) {
935 verbose = 1;
936 } else if (!strcmp(arg, "-o")) {
937 if (index_name || (i+1) >= argc)
938 usage(index_pack_usage);
939 index_name = argv[++i];
940 } else if (!prefixcmp(arg, "--index-version=")) {
941 char *c;
942 pack_idx_default_version = strtoul(arg + 16, &c, 10);
943 if (pack_idx_default_version > 2)
944 die("bad %s", arg);
945 if (*c == ',')
946 pack_idx_off32_limit = strtoul(c+1, &c, 0);
947 if (*c || pack_idx_off32_limit & 0x80000000)
948 die("bad %s", arg);
949 } else
950 usage(index_pack_usage);
951 continue;
952 }
953
954 if (pack_name)
955 usage(index_pack_usage);
956 pack_name = arg;
957 }
958
959 if (!pack_name && !from_stdin)
960 usage(index_pack_usage);
961 if (fix_thin_pack && !from_stdin)
962 die("--fix-thin cannot be used without --stdin");
963 if (!index_name && pack_name) {
964 int len = strlen(pack_name);
965 if (!has_extension(pack_name, ".pack"))
966 die("packfile name '%s' does not end with '.pack'",
967 pack_name);
968 index_name_buf = xmalloc(len);
969 memcpy(index_name_buf, pack_name, len - 5);
970 strcpy(index_name_buf + len - 5, ".idx");
971 index_name = index_name_buf;
972 }
973 if (keep_msg && !keep_name && pack_name) {
974 int len = strlen(pack_name);
975 if (!has_extension(pack_name, ".pack"))
976 die("packfile name '%s' does not end with '.pack'",
977 pack_name);
978 keep_name_buf = xmalloc(len);
979 memcpy(keep_name_buf, pack_name, len - 5);
980 strcpy(keep_name_buf + len - 5, ".keep");
981 keep_name = keep_name_buf;
982 }
983
984 curr_pack = open_pack_file(pack_name);
985 parse_pack_header();
986 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
987 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
988 parse_pack_objects(pack_sha1);
989 if (nr_deltas == nr_resolved_deltas) {
990 stop_progress(&progress);
991 /* Flush remaining pack final 20-byte SHA1. */
992 flush();
993 } else {
994 if (fix_thin_pack) {
995 struct sha1file *f;
996 unsigned char read_sha1[20], tail_sha1[20];
997 char msg[48];
998 int nr_unresolved = nr_deltas - nr_resolved_deltas;
999 int nr_objects_initial = nr_objects;
1000 if (nr_unresolved <= 0)
1001 die("confusion beyond insanity");
1002 objects = xrealloc(objects,
1003 (nr_objects + nr_unresolved + 1)
1004 * sizeof(*objects));
1005 f = sha1fd(output_fd, curr_pack);
1006 fix_unresolved_deltas(f, nr_unresolved);
1007 sprintf(msg, "completed with %d local objects",
1008 nr_objects - nr_objects_initial);
1009 stop_progress_msg(&progress, msg);
1010 sha1close(f, tail_sha1, 0);
1011 hashcpy(read_sha1, pack_sha1);
1012 fixup_pack_header_footer(output_fd, pack_sha1,
1013 curr_pack, nr_objects,
1014 read_sha1, consumed_bytes-20);
1015 if (hashcmp(read_sha1, tail_sha1) != 0)
1016 die("Unexpected tail checksum for %s "
1017 "(disk corruption?)", curr_pack);
1018 }
1019 if (nr_deltas != nr_resolved_deltas)
1020 die("pack has %d unresolved deltas",
1021 nr_deltas - nr_resolved_deltas);
1022 }
1023 free(deltas);
1024 if (strict)
1025 check_objects();
1026
1027 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1028 for (i = 0; i < nr_objects; i++)
1029 idx_objects[i] = &objects[i].idx;
1030 curr_index = write_idx_file(index_name, idx_objects, nr_objects, pack_sha1);
1031 free(idx_objects);
1032
1033 final(pack_name, curr_pack,
1034 index_name, curr_index,
1035 keep_name, keep_msg,
1036 pack_sha1);
1037 free(objects);
1038 free(index_name_buf);
1039 free(keep_name_buf);
1040 if (pack_name == NULL)
1041 free((void *) curr_pack);
1042 if (index_name == NULL)
1043 free((void *) curr_index);
1044
1045 return 0;
1046 }