fix openssl headers conflicting with custom SHA1 implementations
[git/git.git] / 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
12 static const char index_pack_usage[] =
13 "git index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] [--strict] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
14
15 struct object_entry
16 {
17 struct pack_idx_entry idx;
18 unsigned long size;
19 unsigned int hdr_size;
20 enum object_type type;
21 enum object_type real_type;
22 };
23
24 union delta_base {
25 unsigned char sha1[20];
26 off_t offset;
27 };
28
29 struct base_data {
30 struct base_data *base;
31 struct base_data *child;
32 struct object_entry *obj;
33 void *data;
34 unsigned long size;
35 };
36
37 /*
38 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
39 * to memcmp() only the first 20 bytes.
40 */
41 #define UNION_BASE_SZ 20
42
43 #define FLAG_LINK (1u<<20)
44 #define FLAG_CHECKED (1u<<21)
45
46 struct delta_entry
47 {
48 union delta_base base;
49 int obj_no;
50 };
51
52 static struct object_entry *objects;
53 static struct delta_entry *deltas;
54 static struct base_data *base_cache;
55 static size_t base_cache_used;
56 static int nr_objects;
57 static int nr_deltas;
58 static int nr_resolved_deltas;
59
60 static int from_stdin;
61 static int strict;
62 static int verbose;
63
64 static struct progress *progress;
65
66 /* We always read in 4kB chunks. */
67 static unsigned char input_buffer[4096];
68 static unsigned int input_offset, input_len;
69 static off_t consumed_bytes;
70 static git_SHA_CTX input_ctx;
71 static uint32_t input_crc32;
72 static int input_fd, output_fd, pack_fd;
73
74 static int mark_link(struct object *obj, int type, void *data)
75 {
76 if (!obj)
77 return -1;
78
79 if (type != OBJ_ANY && obj->type != type)
80 die("object type mismatch at %s", sha1_to_hex(obj->sha1));
81
82 obj->flags |= FLAG_LINK;
83 return 0;
84 }
85
86 /* The content of each linked object must have been checked
87 or it must be already present in the object database */
88 static void check_object(struct object *obj)
89 {
90 if (!obj)
91 return;
92
93 if (!(obj->flags & FLAG_LINK))
94 return;
95
96 if (!(obj->flags & FLAG_CHECKED)) {
97 unsigned long size;
98 int type = sha1_object_info(obj->sha1, &size);
99 if (type != obj->type || type <= 0)
100 die("object of unexpected type");
101 obj->flags |= FLAG_CHECKED;
102 return;
103 }
104 }
105
106 static void check_objects(void)
107 {
108 unsigned i, max;
109
110 max = get_max_object_index();
111 for (i = 0; i < max; i++)
112 check_object(get_indexed_object(i));
113 }
114
115
116 /* Discard current buffer used content. */
117 static void flush(void)
118 {
119 if (input_offset) {
120 if (output_fd >= 0)
121 write_or_die(output_fd, input_buffer, input_offset);
122 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
123 memmove(input_buffer, input_buffer + input_offset, input_len);
124 input_offset = 0;
125 }
126 }
127
128 /*
129 * Make sure at least "min" bytes are available in the buffer, and
130 * return the pointer to the buffer.
131 */
132 static void *fill(int min)
133 {
134 if (min <= input_len)
135 return input_buffer + input_offset;
136 if (min > sizeof(input_buffer))
137 die("cannot fill %d bytes", min);
138 flush();
139 do {
140 ssize_t ret = xread(input_fd, input_buffer + input_len,
141 sizeof(input_buffer) - input_len);
142 if (ret <= 0) {
143 if (!ret)
144 die("early EOF");
145 die("read error on input: %s", strerror(errno));
146 }
147 input_len += ret;
148 if (from_stdin)
149 display_throughput(progress, consumed_bytes + input_len);
150 } while (input_len < min);
151 return input_buffer;
152 }
153
154 static void use(int bytes)
155 {
156 if (bytes > input_len)
157 die("used more bytes than were available");
158 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
159 input_len -= bytes;
160 input_offset += bytes;
161
162 /* make sure off_t is sufficiently large not to wrap */
163 if (consumed_bytes > consumed_bytes + bytes)
164 die("pack too large for current definition of off_t");
165 consumed_bytes += bytes;
166 }
167
168 static char *open_pack_file(char *pack_name)
169 {
170 if (from_stdin) {
171 input_fd = 0;
172 if (!pack_name) {
173 static char tmpfile[PATH_MAX];
174 snprintf(tmpfile, sizeof(tmpfile),
175 "%s/pack/tmp_pack_XXXXXX", get_object_directory());
176 output_fd = xmkstemp(tmpfile);
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("unable to create %s: %s\n", pack_name, strerror(errno));
182 pack_fd = output_fd;
183 } else {
184 input_fd = open(pack_name, O_RDONLY);
185 if (input_fd < 0)
186 die("cannot open packfile '%s': %s",
187 pack_name, strerror(errno));
188 output_fd = -1;
189 pack_fd = input_fd;
190 }
191 git_SHA1_Init(&input_ctx);
192 return pack_name;
193 }
194
195 static void parse_pack_header(void)
196 {
197 struct pack_header *hdr = fill(sizeof(struct pack_header));
198
199 /* Header consistency check */
200 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
201 die("pack signature mismatch");
202 if (!pack_version_ok(hdr->hdr_version))
203 die("pack version %"PRIu32" unsupported",
204 ntohl(hdr->hdr_version));
205
206 nr_objects = ntohl(hdr->hdr_entries);
207 use(sizeof(struct pack_header));
208 }
209
210 static void bad_object(unsigned long offset, const char *format,
211 ...) NORETURN __attribute__((format (printf, 2, 3)));
212
213 static void bad_object(unsigned long offset, const char *format, ...)
214 {
215 va_list params;
216 char buf[1024];
217
218 va_start(params, format);
219 vsnprintf(buf, sizeof(buf), format, params);
220 va_end(params);
221 die("pack has bad object at offset %lu: %s", offset, buf);
222 }
223
224 static void prune_base_data(struct base_data *retain)
225 {
226 struct base_data *b = base_cache;
227 for (b = base_cache;
228 base_cache_used > delta_base_cache_limit && b;
229 b = b->child) {
230 if (b->data && b != retain) {
231 free(b->data);
232 b->data = NULL;
233 base_cache_used -= b->size;
234 }
235 }
236 }
237
238 static void link_base_data(struct base_data *base, struct base_data *c)
239 {
240 if (base)
241 base->child = c;
242 else
243 base_cache = c;
244
245 c->base = base;
246 c->child = NULL;
247 base_cache_used += c->size;
248 prune_base_data(c);
249 }
250
251 static void unlink_base_data(struct base_data *c)
252 {
253 struct base_data *base = c->base;
254 if (base)
255 base->child = NULL;
256 else
257 base_cache = NULL;
258 if (c->data) {
259 free(c->data);
260 base_cache_used -= c->size;
261 }
262 }
263
264 static void *unpack_entry_data(unsigned long offset, unsigned long size)
265 {
266 z_stream stream;
267 void *buf = xmalloc(size);
268
269 memset(&stream, 0, sizeof(stream));
270 stream.next_out = buf;
271 stream.avail_out = size;
272 stream.next_in = fill(1);
273 stream.avail_in = input_len;
274 inflateInit(&stream);
275
276 for (;;) {
277 int ret = inflate(&stream, 0);
278 use(input_len - stream.avail_in);
279 if (stream.total_out == size && ret == Z_STREAM_END)
280 break;
281 if (ret != Z_OK)
282 bad_object(offset, "inflate returned %d", ret);
283 stream.next_in = fill(1);
284 stream.avail_in = input_len;
285 }
286 inflateEnd(&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, c;
293 unsigned long size;
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 & 0x7fUL) << 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 >= 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 long rdy = 0;
360 unsigned char *src, *data;
361 z_stream stream;
362 int st;
363
364 src = xmalloc(len);
365 data = src;
366 do {
367 ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
368 if (n <= 0)
369 die("cannot pread pack file: %s", strerror(errno));
370 rdy += n;
371 } while (rdy < len);
372 data = xmalloc(obj->size);
373 memset(&stream, 0, sizeof(stream));
374 stream.next_out = data;
375 stream.avail_out = obj->size;
376 stream.next_in = src;
377 stream.avail_in = len;
378 inflateInit(&stream);
379 while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
380 inflateEnd(&stream);
381 if (st != Z_STREAM_END || stream.total_out != obj->size)
382 die("serious inflate inconsistency");
383 free(src);
384 return data;
385 }
386
387 static int find_delta(const union delta_base *base)
388 {
389 int first = 0, last = nr_deltas;
390
391 while (first < last) {
392 int next = (first + last) / 2;
393 struct delta_entry *delta = &deltas[next];
394 int cmp;
395
396 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
397 if (!cmp)
398 return next;
399 if (cmp < 0) {
400 last = next;
401 continue;
402 }
403 first = next+1;
404 }
405 return -first-1;
406 }
407
408 static int find_delta_children(const union delta_base *base,
409 int *first_index, int *last_index)
410 {
411 int first = find_delta(base);
412 int last = first;
413 int end = nr_deltas - 1;
414
415 if (first < 0)
416 return -1;
417 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
418 --first;
419 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
420 ++last;
421 *first_index = first;
422 *last_index = last;
423 return 0;
424 }
425
426 static void sha1_object(const void *data, unsigned long size,
427 enum object_type type, unsigned char *sha1)
428 {
429 hash_sha1_file(data, size, typename(type), sha1);
430 if (has_sha1_file(sha1)) {
431 void *has_data;
432 enum object_type has_type;
433 unsigned long has_size;
434 has_data = read_sha1_file(sha1, &has_type, &has_size);
435 if (!has_data)
436 die("cannot read existing object %s", sha1_to_hex(sha1));
437 if (size != has_size || type != has_type ||
438 memcmp(data, has_data, size) != 0)
439 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
440 free(has_data);
441 }
442 if (strict) {
443 if (type == OBJ_BLOB) {
444 struct blob *blob = lookup_blob(sha1);
445 if (blob)
446 blob->object.flags |= FLAG_CHECKED;
447 else
448 die("invalid blob object %s", sha1_to_hex(sha1));
449 } else {
450 struct object *obj;
451 int eaten;
452 void *buf = (void *) data;
453
454 /*
455 * we do not need to free the memory here, as the
456 * buf is deleted by the caller.
457 */
458 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
459 if (!obj)
460 die("invalid %s", typename(type));
461 if (fsck_object(obj, 1, fsck_error_function))
462 die("Error in object");
463 if (fsck_walk(obj, mark_link, 0))
464 die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
465
466 if (obj->type == OBJ_TREE) {
467 struct tree *item = (struct tree *) obj;
468 item->buffer = NULL;
469 }
470 if (obj->type == OBJ_COMMIT) {
471 struct commit *commit = (struct commit *) obj;
472 commit->buffer = NULL;
473 }
474 obj->flags |= FLAG_CHECKED;
475 }
476 }
477 }
478
479 static void *get_base_data(struct base_data *c)
480 {
481 if (!c->data) {
482 struct object_entry *obj = c->obj;
483
484 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
485 void *base = get_base_data(c->base);
486 void *raw = get_data_from_pack(obj);
487 c->data = patch_delta(
488 base, c->base->size,
489 raw, obj->size,
490 &c->size);
491 free(raw);
492 if (!c->data)
493 bad_object(obj->idx.offset, "failed to apply delta");
494 } else
495 c->data = get_data_from_pack(obj);
496
497 base_cache_used += c->size;
498 prune_base_data(c);
499 }
500 return c->data;
501 }
502
503 static void resolve_delta(struct object_entry *delta_obj,
504 struct base_data *base_obj, enum object_type type)
505 {
506 void *delta_data;
507 unsigned long delta_size;
508 union delta_base delta_base;
509 int j, first, last;
510 struct base_data result;
511
512 delta_obj->real_type = type;
513 delta_data = get_data_from_pack(delta_obj);
514 delta_size = delta_obj->size;
515 result.data = patch_delta(get_base_data(base_obj), base_obj->size,
516 delta_data, delta_size,
517 &result.size);
518 free(delta_data);
519 if (!result.data)
520 bad_object(delta_obj->idx.offset, "failed to apply delta");
521 sha1_object(result.data, result.size, type, delta_obj->idx.sha1);
522 nr_resolved_deltas++;
523
524 result.obj = delta_obj;
525 link_base_data(base_obj, &result);
526
527 hashcpy(delta_base.sha1, delta_obj->idx.sha1);
528 if (!find_delta_children(&delta_base, &first, &last)) {
529 for (j = first; j <= last; j++) {
530 struct object_entry *child = objects + deltas[j].obj_no;
531 if (child->real_type == OBJ_REF_DELTA)
532 resolve_delta(child, &result, type);
533 }
534 }
535
536 memset(&delta_base, 0, sizeof(delta_base));
537 delta_base.offset = delta_obj->idx.offset;
538 if (!find_delta_children(&delta_base, &first, &last)) {
539 for (j = first; j <= last; j++) {
540 struct object_entry *child = objects + deltas[j].obj_no;
541 if (child->real_type == OBJ_OFS_DELTA)
542 resolve_delta(child, &result, type);
543 }
544 }
545
546 unlink_base_data(&result);
547 }
548
549 static int compare_delta_entry(const void *a, const void *b)
550 {
551 const struct delta_entry *delta_a = a;
552 const struct delta_entry *delta_b = b;
553 return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
554 }
555
556 /* Parse all objects and return the pack content SHA1 hash */
557 static void parse_pack_objects(unsigned char *sha1)
558 {
559 int i;
560 struct delta_entry *delta = deltas;
561 struct stat st;
562
563 /*
564 * First pass:
565 * - find locations of all objects;
566 * - calculate SHA1 of all non-delta objects;
567 * - remember base (SHA1 or offset) for all deltas.
568 */
569 if (verbose)
570 progress = start_progress(
571 from_stdin ? "Receiving objects" : "Indexing objects",
572 nr_objects);
573 for (i = 0; i < nr_objects; i++) {
574 struct object_entry *obj = &objects[i];
575 void *data = unpack_raw_entry(obj, &delta->base);
576 obj->real_type = obj->type;
577 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
578 nr_deltas++;
579 delta->obj_no = i;
580 delta++;
581 } else
582 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
583 free(data);
584 display_progress(progress, i+1);
585 }
586 objects[i].idx.offset = consumed_bytes;
587 stop_progress(&progress);
588
589 /* Check pack integrity */
590 flush();
591 git_SHA1_Final(sha1, &input_ctx);
592 if (hashcmp(fill(20), sha1))
593 die("pack is corrupted (SHA1 mismatch)");
594 use(20);
595
596 /* If input_fd is a file, we should have reached its end now. */
597 if (fstat(input_fd, &st))
598 die("cannot fstat packfile: %s", strerror(errno));
599 if (S_ISREG(st.st_mode) &&
600 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
601 die("pack has junk at the end");
602
603 if (!nr_deltas)
604 return;
605
606 /* Sort deltas by base SHA1/offset for fast searching */
607 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
608 compare_delta_entry);
609
610 /*
611 * Second pass:
612 * - for all non-delta objects, look if it is used as a base for
613 * deltas;
614 * - if used as a base, uncompress the object and apply all deltas,
615 * recursively checking if the resulting object is used as a base
616 * for some more deltas.
617 */
618 if (verbose)
619 progress = start_progress("Resolving deltas", nr_deltas);
620 for (i = 0; i < nr_objects; i++) {
621 struct object_entry *obj = &objects[i];
622 union delta_base base;
623 int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
624 struct base_data base_obj;
625
626 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
627 continue;
628 hashcpy(base.sha1, obj->idx.sha1);
629 ref = !find_delta_children(&base, &ref_first, &ref_last);
630 memset(&base, 0, sizeof(base));
631 base.offset = obj->idx.offset;
632 ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
633 if (!ref && !ofs)
634 continue;
635 base_obj.data = get_data_from_pack(obj);
636 base_obj.size = obj->size;
637 base_obj.obj = obj;
638 link_base_data(NULL, &base_obj);
639
640 if (ref)
641 for (j = ref_first; j <= ref_last; j++) {
642 struct object_entry *child = objects + deltas[j].obj_no;
643 if (child->real_type == OBJ_REF_DELTA)
644 resolve_delta(child, &base_obj, obj->type);
645 }
646 if (ofs)
647 for (j = ofs_first; j <= ofs_last; j++) {
648 struct object_entry *child = objects + deltas[j].obj_no;
649 if (child->real_type == OBJ_OFS_DELTA)
650 resolve_delta(child, &base_obj, obj->type);
651 }
652 unlink_base_data(&base_obj);
653 display_progress(progress, nr_resolved_deltas);
654 }
655 }
656
657 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
658 {
659 z_stream stream;
660 unsigned long maxsize;
661 void *out;
662
663 memset(&stream, 0, sizeof(stream));
664 deflateInit(&stream, zlib_compression_level);
665 maxsize = deflateBound(&stream, size);
666 out = xmalloc(maxsize);
667
668 /* Compress it */
669 stream.next_in = in;
670 stream.avail_in = size;
671 stream.next_out = out;
672 stream.avail_out = maxsize;
673 while (deflate(&stream, Z_FINISH) == Z_OK);
674 deflateEnd(&stream);
675
676 size = stream.total_out;
677 sha1write(f, out, size);
678 free(out);
679 return size;
680 }
681
682 static struct object_entry *append_obj_to_pack(struct sha1file *f,
683 const unsigned char *sha1, void *buf,
684 unsigned long size, enum object_type type)
685 {
686 struct object_entry *obj = &objects[nr_objects++];
687 unsigned char header[10];
688 unsigned long s = size;
689 int n = 0;
690 unsigned char c = (type << 4) | (s & 15);
691 s >>= 4;
692 while (s) {
693 header[n++] = c | 0x80;
694 c = s & 0x7f;
695 s >>= 7;
696 }
697 header[n++] = c;
698 crc32_begin(f);
699 sha1write(f, header, n);
700 obj[0].size = size;
701 obj[0].hdr_size = n;
702 obj[0].type = type;
703 obj[0].real_type = type;
704 obj[1].idx.offset = obj[0].idx.offset + n;
705 obj[1].idx.offset += write_compressed(f, buf, size);
706 obj[0].idx.crc32 = crc32_end(f);
707 hashcpy(obj->idx.sha1, sha1);
708 return obj;
709 }
710
711 static int delta_pos_compare(const void *_a, const void *_b)
712 {
713 struct delta_entry *a = *(struct delta_entry **)_a;
714 struct delta_entry *b = *(struct delta_entry **)_b;
715 return a->obj_no - b->obj_no;
716 }
717
718 static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
719 {
720 struct delta_entry **sorted_by_pos;
721 int i, n = 0;
722
723 /*
724 * Since many unresolved deltas may well be themselves base objects
725 * for more unresolved deltas, we really want to include the
726 * smallest number of base objects that would cover as much delta
727 * as possible by picking the
728 * trunc deltas first, allowing for other deltas to resolve without
729 * additional base objects. Since most base objects are to be found
730 * before deltas depending on them, a good heuristic is to start
731 * resolving deltas in the same order as their position in the pack.
732 */
733 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
734 for (i = 0; i < nr_deltas; i++) {
735 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
736 continue;
737 sorted_by_pos[n++] = &deltas[i];
738 }
739 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
740
741 for (i = 0; i < n; i++) {
742 struct delta_entry *d = sorted_by_pos[i];
743 enum object_type type;
744 int j, first, last;
745 struct base_data base_obj;
746
747 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
748 continue;
749 base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size);
750 if (!base_obj.data)
751 continue;
752
753 if (check_sha1_signature(d->base.sha1, base_obj.data,
754 base_obj.size, typename(type)))
755 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
756 base_obj.obj = append_obj_to_pack(f, d->base.sha1,
757 base_obj.data, base_obj.size, type);
758 link_base_data(NULL, &base_obj);
759
760 find_delta_children(&d->base, &first, &last);
761 for (j = first; j <= last; j++) {
762 struct object_entry *child = objects + deltas[j].obj_no;
763 if (child->real_type == OBJ_REF_DELTA)
764 resolve_delta(child, &base_obj, type);
765 }
766
767 unlink_base_data(&base_obj);
768 display_progress(progress, nr_resolved_deltas);
769 }
770 free(sorted_by_pos);
771 }
772
773 static void final(const char *final_pack_name, const char *curr_pack_name,
774 const char *final_index_name, const char *curr_index_name,
775 const char *keep_name, const char *keep_msg,
776 unsigned char *sha1)
777 {
778 const char *report = "pack";
779 char name[PATH_MAX];
780 int err;
781
782 if (!from_stdin) {
783 close(input_fd);
784 } else {
785 fsync_or_die(output_fd, curr_pack_name);
786 err = close(output_fd);
787 if (err)
788 die("error while closing pack file: %s", strerror(errno));
789 chmod(curr_pack_name, 0444);
790 }
791
792 if (keep_msg) {
793 int keep_fd, keep_msg_len = strlen(keep_msg);
794 if (!keep_name) {
795 snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
796 get_object_directory(), sha1_to_hex(sha1));
797 keep_name = name;
798 }
799 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
800 if (keep_fd < 0) {
801 if (errno != EEXIST)
802 die("cannot write keep file");
803 } else {
804 if (keep_msg_len > 0) {
805 write_or_die(keep_fd, keep_msg, keep_msg_len);
806 write_or_die(keep_fd, "\n", 1);
807 }
808 if (close(keep_fd) != 0)
809 die("cannot write keep file");
810 report = "keep";
811 }
812 }
813
814 if (final_pack_name != curr_pack_name) {
815 if (!final_pack_name) {
816 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
817 get_object_directory(), sha1_to_hex(sha1));
818 final_pack_name = name;
819 }
820 if (move_temp_to_file(curr_pack_name, final_pack_name))
821 die("cannot store pack file");
822 }
823
824 chmod(curr_index_name, 0444);
825 if (final_index_name != curr_index_name) {
826 if (!final_index_name) {
827 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
828 get_object_directory(), sha1_to_hex(sha1));
829 final_index_name = name;
830 }
831 if (move_temp_to_file(curr_index_name, final_index_name))
832 die("cannot store index file");
833 }
834
835 if (!from_stdin) {
836 printf("%s\n", sha1_to_hex(sha1));
837 } else {
838 char buf[48];
839 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
840 report, sha1_to_hex(sha1));
841 write_or_die(1, buf, len);
842
843 /*
844 * Let's just mimic git-unpack-objects here and write
845 * the last part of the input buffer to stdout.
846 */
847 while (input_len) {
848 err = xwrite(1, input_buffer + input_offset, input_len);
849 if (err <= 0)
850 break;
851 input_len -= err;
852 input_offset += err;
853 }
854 }
855 }
856
857 static int git_index_pack_config(const char *k, const char *v, void *cb)
858 {
859 if (!strcmp(k, "pack.indexversion")) {
860 pack_idx_default_version = git_config_int(k, v);
861 if (pack_idx_default_version > 2)
862 die("bad pack.indexversion=%"PRIu32,
863 pack_idx_default_version);
864 return 0;
865 }
866 return git_default_config(k, v, cb);
867 }
868
869 int main(int argc, char **argv)
870 {
871 int i, fix_thin_pack = 0;
872 char *curr_pack, *pack_name = NULL;
873 char *curr_index, *index_name = NULL;
874 const char *keep_name = NULL, *keep_msg = NULL;
875 char *index_name_buf = NULL, *keep_name_buf = NULL;
876 struct pack_idx_entry **idx_objects;
877 unsigned char pack_sha1[20];
878 int nongit = 0;
879
880 setup_git_directory_gently(&nongit);
881 git_config(git_index_pack_config, NULL);
882
883 for (i = 1; i < argc; i++) {
884 char *arg = argv[i];
885
886 if (*arg == '-') {
887 if (!strcmp(arg, "--stdin")) {
888 from_stdin = 1;
889 } else if (!strcmp(arg, "--fix-thin")) {
890 fix_thin_pack = 1;
891 } else if (!strcmp(arg, "--strict")) {
892 strict = 1;
893 } else if (!strcmp(arg, "--keep")) {
894 keep_msg = "";
895 } else if (!prefixcmp(arg, "--keep=")) {
896 keep_msg = arg + 7;
897 } else if (!prefixcmp(arg, "--pack_header=")) {
898 struct pack_header *hdr;
899 char *c;
900
901 hdr = (struct pack_header *)input_buffer;
902 hdr->hdr_signature = htonl(PACK_SIGNATURE);
903 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
904 if (*c != ',')
905 die("bad %s", arg);
906 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
907 if (*c)
908 die("bad %s", arg);
909 input_len = sizeof(*hdr);
910 } else if (!strcmp(arg, "-v")) {
911 verbose = 1;
912 } else if (!strcmp(arg, "-o")) {
913 if (index_name || (i+1) >= argc)
914 usage(index_pack_usage);
915 index_name = argv[++i];
916 } else if (!prefixcmp(arg, "--index-version=")) {
917 char *c;
918 pack_idx_default_version = strtoul(arg + 16, &c, 10);
919 if (pack_idx_default_version > 2)
920 die("bad %s", arg);
921 if (*c == ',')
922 pack_idx_off32_limit = strtoul(c+1, &c, 0);
923 if (*c || pack_idx_off32_limit & 0x80000000)
924 die("bad %s", arg);
925 } else
926 usage(index_pack_usage);
927 continue;
928 }
929
930 if (pack_name)
931 usage(index_pack_usage);
932 pack_name = arg;
933 }
934
935 if (!pack_name && !from_stdin)
936 usage(index_pack_usage);
937 if (fix_thin_pack && !from_stdin)
938 die("--fix-thin cannot be used without --stdin");
939 if (!index_name && pack_name) {
940 int len = strlen(pack_name);
941 if (!has_extension(pack_name, ".pack"))
942 die("packfile name '%s' does not end with '.pack'",
943 pack_name);
944 index_name_buf = xmalloc(len);
945 memcpy(index_name_buf, pack_name, len - 5);
946 strcpy(index_name_buf + len - 5, ".idx");
947 index_name = index_name_buf;
948 }
949 if (keep_msg && !keep_name && pack_name) {
950 int len = strlen(pack_name);
951 if (!has_extension(pack_name, ".pack"))
952 die("packfile name '%s' does not end with '.pack'",
953 pack_name);
954 keep_name_buf = xmalloc(len);
955 memcpy(keep_name_buf, pack_name, len - 5);
956 strcpy(keep_name_buf + len - 5, ".keep");
957 keep_name = keep_name_buf;
958 }
959
960 curr_pack = open_pack_file(pack_name);
961 parse_pack_header();
962 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
963 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
964 parse_pack_objects(pack_sha1);
965 if (nr_deltas == nr_resolved_deltas) {
966 stop_progress(&progress);
967 /* Flush remaining pack final 20-byte SHA1. */
968 flush();
969 } else {
970 if (fix_thin_pack) {
971 struct sha1file *f;
972 unsigned char read_sha1[20], tail_sha1[20];
973 char msg[48];
974 int nr_unresolved = nr_deltas - nr_resolved_deltas;
975 int nr_objects_initial = nr_objects;
976 if (nr_unresolved <= 0)
977 die("confusion beyond insanity");
978 objects = xrealloc(objects,
979 (nr_objects + nr_unresolved + 1)
980 * sizeof(*objects));
981 f = sha1fd(output_fd, curr_pack);
982 fix_unresolved_deltas(f, nr_unresolved);
983 sprintf(msg, "completed with %d local objects",
984 nr_objects - nr_objects_initial);
985 stop_progress_msg(&progress, msg);
986 sha1close(f, tail_sha1, 0);
987 hashcpy(read_sha1, pack_sha1);
988 fixup_pack_header_footer(output_fd, pack_sha1,
989 curr_pack, nr_objects,
990 read_sha1, consumed_bytes-20);
991 if (hashcmp(read_sha1, tail_sha1) != 0)
992 die("Unexpected tail checksum for %s "
993 "(disk corruption?)", curr_pack);
994 }
995 if (nr_deltas != nr_resolved_deltas)
996 die("pack has %d unresolved deltas",
997 nr_deltas - nr_resolved_deltas);
998 }
999 free(deltas);
1000 if (strict)
1001 check_objects();
1002
1003 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1004 for (i = 0; i < nr_objects; i++)
1005 idx_objects[i] = &objects[i].idx;
1006 curr_index = write_idx_file(index_name, idx_objects, nr_objects, pack_sha1);
1007 free(idx_objects);
1008
1009 final(pack_name, curr_pack,
1010 index_name, curr_index,
1011 keep_name, keep_msg,
1012 pack_sha1);
1013 free(objects);
1014 free(index_name_buf);
1015 free(keep_name_buf);
1016 if (pack_name == NULL)
1017 free(curr_pack);
1018 if (index_name == NULL)
1019 free(curr_index);
1020
1021 return 0;
1022 }