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