Merge branch 'jn/gitweb-grep'
[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 /*
30 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
31 * to memcmp() only the first 20 bytes.
32 */
33 #define UNION_BASE_SZ 20
34
35 #define FLAG_LINK (1u<<20)
36 #define FLAG_CHECKED (1u<<21)
37
38 struct delta_entry
39 {
40 union delta_base base;
41 int obj_no;
42 };
43
44 static struct object_entry *objects;
45 static struct delta_entry *deltas;
46 static int nr_objects;
47 static int nr_deltas;
48 static int nr_resolved_deltas;
49
50 static int from_stdin;
51 static int strict;
52 static int verbose;
53
54 static struct progress *progress;
55
56 /* We always read in 4kB chunks. */
57 static unsigned char input_buffer[4096];
58 static unsigned int input_offset, input_len;
59 static off_t consumed_bytes;
60 static SHA_CTX input_ctx;
61 static uint32_t input_crc32;
62 static int input_fd, output_fd, pack_fd;
63
64 static int mark_link(struct object *obj, int type, void *data)
65 {
66 if (!obj)
67 return -1;
68
69 if (type != OBJ_ANY && obj->type != type)
70 die("object type mismatch at %s", sha1_to_hex(obj->sha1));
71
72 obj->flags |= FLAG_LINK;
73 return 0;
74 }
75
76 /* The content of each linked object must have been checked
77 or it must be already present in the object database */
78 static void check_object(struct object *obj)
79 {
80 if (!obj)
81 return;
82
83 if (!(obj->flags & FLAG_LINK))
84 return;
85
86 if (!(obj->flags & FLAG_CHECKED)) {
87 unsigned long size;
88 int type = sha1_object_info(obj->sha1, &size);
89 if (type != obj->type || type <= 0)
90 die("object of unexpected type");
91 obj->flags |= FLAG_CHECKED;
92 return;
93 }
94 }
95
96 static void check_objects(void)
97 {
98 unsigned i, max;
99
100 max = get_max_object_index();
101 for (i = 0; i < max; i++)
102 check_object(get_indexed_object(i));
103 }
104
105
106 /* Discard current buffer used content. */
107 static void flush(void)
108 {
109 if (input_offset) {
110 if (output_fd >= 0)
111 write_or_die(output_fd, input_buffer, input_offset);
112 SHA1_Update(&input_ctx, input_buffer, input_offset);
113 memmove(input_buffer, input_buffer + input_offset, input_len);
114 input_offset = 0;
115 }
116 }
117
118 /*
119 * Make sure at least "min" bytes are available in the buffer, and
120 * return the pointer to the buffer.
121 */
122 static void *fill(int min)
123 {
124 if (min <= input_len)
125 return input_buffer + input_offset;
126 if (min > sizeof(input_buffer))
127 die("cannot fill %d bytes", min);
128 flush();
129 do {
130 ssize_t ret = xread(input_fd, input_buffer + input_len,
131 sizeof(input_buffer) - input_len);
132 if (ret <= 0) {
133 if (!ret)
134 die("early EOF");
135 die("read error on input: %s", strerror(errno));
136 }
137 input_len += ret;
138 if (from_stdin)
139 display_throughput(progress, consumed_bytes + input_len);
140 } while (input_len < min);
141 return input_buffer;
142 }
143
144 static void use(int bytes)
145 {
146 if (bytes > input_len)
147 die("used more bytes than were available");
148 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
149 input_len -= bytes;
150 input_offset += bytes;
151
152 /* make sure off_t is sufficiently large not to wrap */
153 if (consumed_bytes > consumed_bytes + bytes)
154 die("pack too large for current definition of off_t");
155 consumed_bytes += bytes;
156 }
157
158 static char *open_pack_file(char *pack_name)
159 {
160 if (from_stdin) {
161 input_fd = 0;
162 if (!pack_name) {
163 static char tmpfile[PATH_MAX];
164 snprintf(tmpfile, sizeof(tmpfile),
165 "%s/tmp_pack_XXXXXX", get_object_directory());
166 output_fd = xmkstemp(tmpfile);
167 pack_name = xstrdup(tmpfile);
168 } else
169 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
170 if (output_fd < 0)
171 die("unable to create %s: %s\n", pack_name, strerror(errno));
172 pack_fd = output_fd;
173 } else {
174 input_fd = open(pack_name, O_RDONLY);
175 if (input_fd < 0)
176 die("cannot open packfile '%s': %s",
177 pack_name, strerror(errno));
178 output_fd = -1;
179 pack_fd = input_fd;
180 }
181 SHA1_Init(&input_ctx);
182 return pack_name;
183 }
184
185 static void parse_pack_header(void)
186 {
187 struct pack_header *hdr = fill(sizeof(struct pack_header));
188
189 /* Header consistency check */
190 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
191 die("pack signature mismatch");
192 if (!pack_version_ok(hdr->hdr_version))
193 die("pack version %d unsupported", ntohl(hdr->hdr_version));
194
195 nr_objects = ntohl(hdr->hdr_entries);
196 use(sizeof(struct pack_header));
197 }
198
199 static void bad_object(unsigned long offset, const char *format,
200 ...) NORETURN __attribute__((format (printf, 2, 3)));
201
202 static void bad_object(unsigned long offset, const char *format, ...)
203 {
204 va_list params;
205 char buf[1024];
206
207 va_start(params, format);
208 vsnprintf(buf, sizeof(buf), format, params);
209 va_end(params);
210 die("pack has bad object at offset %lu: %s", offset, buf);
211 }
212
213 static void *unpack_entry_data(unsigned long offset, unsigned long size)
214 {
215 z_stream stream;
216 void *buf = xmalloc(size);
217
218 memset(&stream, 0, sizeof(stream));
219 stream.next_out = buf;
220 stream.avail_out = size;
221 stream.next_in = fill(1);
222 stream.avail_in = input_len;
223 inflateInit(&stream);
224
225 for (;;) {
226 int ret = inflate(&stream, 0);
227 use(input_len - stream.avail_in);
228 if (stream.total_out == size && ret == Z_STREAM_END)
229 break;
230 if (ret != Z_OK)
231 bad_object(offset, "inflate returned %d", ret);
232 stream.next_in = fill(1);
233 stream.avail_in = input_len;
234 }
235 inflateEnd(&stream);
236 return buf;
237 }
238
239 static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
240 {
241 unsigned char *p, c;
242 unsigned long size;
243 off_t base_offset;
244 unsigned shift;
245 void *data;
246
247 obj->idx.offset = consumed_bytes;
248 input_crc32 = crc32(0, Z_NULL, 0);
249
250 p = fill(1);
251 c = *p;
252 use(1);
253 obj->type = (c >> 4) & 7;
254 size = (c & 15);
255 shift = 4;
256 while (c & 0x80) {
257 p = fill(1);
258 c = *p;
259 use(1);
260 size += (c & 0x7fUL) << shift;
261 shift += 7;
262 }
263 obj->size = size;
264
265 switch (obj->type) {
266 case OBJ_REF_DELTA:
267 hashcpy(delta_base->sha1, fill(20));
268 use(20);
269 break;
270 case OBJ_OFS_DELTA:
271 memset(delta_base, 0, sizeof(*delta_base));
272 p = fill(1);
273 c = *p;
274 use(1);
275 base_offset = c & 127;
276 while (c & 128) {
277 base_offset += 1;
278 if (!base_offset || MSB(base_offset, 7))
279 bad_object(obj->idx.offset, "offset value overflow for delta base object");
280 p = fill(1);
281 c = *p;
282 use(1);
283 base_offset = (base_offset << 7) + (c & 127);
284 }
285 delta_base->offset = obj->idx.offset - base_offset;
286 if (delta_base->offset >= obj->idx.offset)
287 bad_object(obj->idx.offset, "delta base offset is out of bound");
288 break;
289 case OBJ_COMMIT:
290 case OBJ_TREE:
291 case OBJ_BLOB:
292 case OBJ_TAG:
293 break;
294 default:
295 bad_object(obj->idx.offset, "unknown object type %d", obj->type);
296 }
297 obj->hdr_size = consumed_bytes - obj->idx.offset;
298
299 data = unpack_entry_data(obj->idx.offset, obj->size);
300 obj->idx.crc32 = input_crc32;
301 return data;
302 }
303
304 static void *get_data_from_pack(struct object_entry *obj)
305 {
306 off_t from = obj[0].idx.offset + obj[0].hdr_size;
307 unsigned long len = obj[1].idx.offset - from;
308 unsigned long rdy = 0;
309 unsigned char *src, *data;
310 z_stream stream;
311 int st;
312
313 src = xmalloc(len);
314 data = src;
315 do {
316 ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
317 if (n <= 0)
318 die("cannot pread pack file: %s", strerror(errno));
319 rdy += n;
320 } while (rdy < len);
321 data = xmalloc(obj->size);
322 memset(&stream, 0, sizeof(stream));
323 stream.next_out = data;
324 stream.avail_out = obj->size;
325 stream.next_in = src;
326 stream.avail_in = len;
327 inflateInit(&stream);
328 while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
329 inflateEnd(&stream);
330 if (st != Z_STREAM_END || stream.total_out != obj->size)
331 die("serious inflate inconsistency");
332 free(src);
333 return data;
334 }
335
336 static int find_delta(const union delta_base *base)
337 {
338 int first = 0, last = nr_deltas;
339
340 while (first < last) {
341 int next = (first + last) / 2;
342 struct delta_entry *delta = &deltas[next];
343 int cmp;
344
345 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
346 if (!cmp)
347 return next;
348 if (cmp < 0) {
349 last = next;
350 continue;
351 }
352 first = next+1;
353 }
354 return -first-1;
355 }
356
357 static int find_delta_children(const union delta_base *base,
358 int *first_index, int *last_index)
359 {
360 int first = find_delta(base);
361 int last = first;
362 int end = nr_deltas - 1;
363
364 if (first < 0)
365 return -1;
366 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
367 --first;
368 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
369 ++last;
370 *first_index = first;
371 *last_index = last;
372 return 0;
373 }
374
375 static void sha1_object(const void *data, unsigned long size,
376 enum object_type type, unsigned char *sha1)
377 {
378 hash_sha1_file(data, size, typename(type), sha1);
379 if (has_sha1_file(sha1)) {
380 void *has_data;
381 enum object_type has_type;
382 unsigned long has_size;
383 has_data = read_sha1_file(sha1, &has_type, &has_size);
384 if (!has_data)
385 die("cannot read existing object %s", sha1_to_hex(sha1));
386 if (size != has_size || type != has_type ||
387 memcmp(data, has_data, size) != 0)
388 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
389 free(has_data);
390 }
391 if (strict) {
392 if (type == OBJ_BLOB) {
393 struct blob *blob = lookup_blob(sha1);
394 if (blob)
395 blob->object.flags |= FLAG_CHECKED;
396 else
397 die("invalid blob object %s", sha1_to_hex(sha1));
398 } else {
399 struct object *obj;
400 int eaten;
401 void *buf = (void *) data;
402
403 /*
404 * we do not need to free the memory here, as the
405 * buf is deleted by the caller.
406 */
407 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
408 if (!obj)
409 die("invalid %s", typename(type));
410 if (fsck_object(obj, 1, fsck_error_function))
411 die("Error in object");
412 if (fsck_walk(obj, mark_link, 0))
413 die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
414
415 if (obj->type == OBJ_TREE) {
416 struct tree *item = (struct tree *) obj;
417 item->buffer = NULL;
418 }
419 if (obj->type == OBJ_COMMIT) {
420 struct commit *commit = (struct commit *) obj;
421 commit->buffer = NULL;
422 }
423 obj->flags |= FLAG_CHECKED;
424 }
425 }
426 }
427
428 static void resolve_delta(struct object_entry *delta_obj, void *base_data,
429 unsigned long base_size, enum object_type type)
430 {
431 void *delta_data;
432 unsigned long delta_size;
433 void *result;
434 unsigned long result_size;
435 union delta_base delta_base;
436 int j, first, last;
437
438 delta_obj->real_type = type;
439 delta_data = get_data_from_pack(delta_obj);
440 delta_size = delta_obj->size;
441 result = patch_delta(base_data, base_size, delta_data, delta_size,
442 &result_size);
443 free(delta_data);
444 if (!result)
445 bad_object(delta_obj->idx.offset, "failed to apply delta");
446 sha1_object(result, result_size, type, delta_obj->idx.sha1);
447 nr_resolved_deltas++;
448
449 hashcpy(delta_base.sha1, delta_obj->idx.sha1);
450 if (!find_delta_children(&delta_base, &first, &last)) {
451 for (j = first; j <= last; j++) {
452 struct object_entry *child = objects + deltas[j].obj_no;
453 if (child->real_type == OBJ_REF_DELTA)
454 resolve_delta(child, result, result_size, type);
455 }
456 }
457
458 memset(&delta_base, 0, sizeof(delta_base));
459 delta_base.offset = delta_obj->idx.offset;
460 if (!find_delta_children(&delta_base, &first, &last)) {
461 for (j = first; j <= last; j++) {
462 struct object_entry *child = objects + deltas[j].obj_no;
463 if (child->real_type == OBJ_OFS_DELTA)
464 resolve_delta(child, result, result_size, type);
465 }
466 }
467
468 free(result);
469 }
470
471 static int compare_delta_entry(const void *a, const void *b)
472 {
473 const struct delta_entry *delta_a = a;
474 const struct delta_entry *delta_b = b;
475 return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
476 }
477
478 /* Parse all objects and return the pack content SHA1 hash */
479 static void parse_pack_objects(unsigned char *sha1)
480 {
481 int i;
482 struct delta_entry *delta = deltas;
483 void *data;
484 struct stat st;
485
486 /*
487 * First pass:
488 * - find locations of all objects;
489 * - calculate SHA1 of all non-delta objects;
490 * - remember base (SHA1 or offset) for all deltas.
491 */
492 if (verbose)
493 progress = start_progress(
494 from_stdin ? "Receiving objects" : "Indexing objects",
495 nr_objects);
496 for (i = 0; i < nr_objects; i++) {
497 struct object_entry *obj = &objects[i];
498 data = unpack_raw_entry(obj, &delta->base);
499 obj->real_type = obj->type;
500 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
501 nr_deltas++;
502 delta->obj_no = i;
503 delta++;
504 } else
505 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
506 free(data);
507 display_progress(progress, i+1);
508 }
509 objects[i].idx.offset = consumed_bytes;
510 stop_progress(&progress);
511
512 /* Check pack integrity */
513 flush();
514 SHA1_Final(sha1, &input_ctx);
515 if (hashcmp(fill(20), sha1))
516 die("pack is corrupted (SHA1 mismatch)");
517 use(20);
518
519 /* If input_fd is a file, we should have reached its end now. */
520 if (fstat(input_fd, &st))
521 die("cannot fstat packfile: %s", strerror(errno));
522 if (S_ISREG(st.st_mode) &&
523 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
524 die("pack has junk at the end");
525
526 if (!nr_deltas)
527 return;
528
529 /* Sort deltas by base SHA1/offset for fast searching */
530 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
531 compare_delta_entry);
532
533 /*
534 * Second pass:
535 * - for all non-delta objects, look if it is used as a base for
536 * deltas;
537 * - if used as a base, uncompress the object and apply all deltas,
538 * recursively checking if the resulting object is used as a base
539 * for some more deltas.
540 */
541 if (verbose)
542 progress = start_progress("Resolving deltas", nr_deltas);
543 for (i = 0; i < nr_objects; i++) {
544 struct object_entry *obj = &objects[i];
545 union delta_base base;
546 int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
547
548 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
549 continue;
550 hashcpy(base.sha1, obj->idx.sha1);
551 ref = !find_delta_children(&base, &ref_first, &ref_last);
552 memset(&base, 0, sizeof(base));
553 base.offset = obj->idx.offset;
554 ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
555 if (!ref && !ofs)
556 continue;
557 data = get_data_from_pack(obj);
558 if (ref)
559 for (j = ref_first; j <= ref_last; j++) {
560 struct object_entry *child = objects + deltas[j].obj_no;
561 if (child->real_type == OBJ_REF_DELTA)
562 resolve_delta(child, data,
563 obj->size, obj->type);
564 }
565 if (ofs)
566 for (j = ofs_first; j <= ofs_last; j++) {
567 struct object_entry *child = objects + deltas[j].obj_no;
568 if (child->real_type == OBJ_OFS_DELTA)
569 resolve_delta(child, data,
570 obj->size, obj->type);
571 }
572 free(data);
573 display_progress(progress, nr_resolved_deltas);
574 }
575 }
576
577 static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
578 {
579 z_stream stream;
580 unsigned long maxsize;
581 void *out;
582
583 memset(&stream, 0, sizeof(stream));
584 deflateInit(&stream, zlib_compression_level);
585 maxsize = deflateBound(&stream, size);
586 out = xmalloc(maxsize);
587
588 /* Compress it */
589 stream.next_in = in;
590 stream.avail_in = size;
591 stream.next_out = out;
592 stream.avail_out = maxsize;
593 while (deflate(&stream, Z_FINISH) == Z_OK);
594 deflateEnd(&stream);
595
596 size = stream.total_out;
597 write_or_die(fd, out, size);
598 *obj_crc = crc32(*obj_crc, out, size);
599 free(out);
600 return size;
601 }
602
603 static void append_obj_to_pack(const unsigned char *sha1, void *buf,
604 unsigned long size, enum object_type type)
605 {
606 struct object_entry *obj = &objects[nr_objects++];
607 unsigned char header[10];
608 unsigned long s = size;
609 int n = 0;
610 unsigned char c = (type << 4) | (s & 15);
611 s >>= 4;
612 while (s) {
613 header[n++] = c | 0x80;
614 c = s & 0x7f;
615 s >>= 7;
616 }
617 header[n++] = c;
618 write_or_die(output_fd, header, n);
619 obj[0].idx.crc32 = crc32(0, Z_NULL, 0);
620 obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n);
621 obj[1].idx.offset = obj[0].idx.offset + n;
622 obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
623 hashcpy(obj->idx.sha1, sha1);
624 }
625
626 static int delta_pos_compare(const void *_a, const void *_b)
627 {
628 struct delta_entry *a = *(struct delta_entry **)_a;
629 struct delta_entry *b = *(struct delta_entry **)_b;
630 return a->obj_no - b->obj_no;
631 }
632
633 static void fix_unresolved_deltas(int nr_unresolved)
634 {
635 struct delta_entry **sorted_by_pos;
636 int i, n = 0;
637
638 /*
639 * Since many unresolved deltas may well be themselves base objects
640 * for more unresolved deltas, we really want to include the
641 * smallest number of base objects that would cover as much delta
642 * as possible by picking the
643 * trunc deltas first, allowing for other deltas to resolve without
644 * additional base objects. Since most base objects are to be found
645 * before deltas depending on them, a good heuristic is to start
646 * resolving deltas in the same order as their position in the pack.
647 */
648 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
649 for (i = 0; i < nr_deltas; i++) {
650 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
651 continue;
652 sorted_by_pos[n++] = &deltas[i];
653 }
654 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
655
656 for (i = 0; i < n; i++) {
657 struct delta_entry *d = sorted_by_pos[i];
658 void *data;
659 unsigned long size;
660 enum object_type type;
661 int j, first, last;
662
663 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
664 continue;
665 data = read_sha1_file(d->base.sha1, &type, &size);
666 if (!data)
667 continue;
668
669 find_delta_children(&d->base, &first, &last);
670 for (j = first; j <= last; j++) {
671 struct object_entry *child = objects + deltas[j].obj_no;
672 if (child->real_type == OBJ_REF_DELTA)
673 resolve_delta(child, data, size, type);
674 }
675
676 if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
677 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
678 append_obj_to_pack(d->base.sha1, data, size, type);
679 free(data);
680 display_progress(progress, nr_resolved_deltas);
681 }
682 free(sorted_by_pos);
683 }
684
685 static void final(const char *final_pack_name, const char *curr_pack_name,
686 const char *final_index_name, const char *curr_index_name,
687 const char *keep_name, const char *keep_msg,
688 unsigned char *sha1)
689 {
690 const char *report = "pack";
691 char name[PATH_MAX];
692 int err;
693
694 if (!from_stdin) {
695 close(input_fd);
696 } else {
697 err = close(output_fd);
698 if (err)
699 die("error while closing pack file: %s", strerror(errno));
700 chmod(curr_pack_name, 0444);
701 }
702
703 if (keep_msg) {
704 int keep_fd, keep_msg_len = strlen(keep_msg);
705 if (!keep_name) {
706 snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
707 get_object_directory(), sha1_to_hex(sha1));
708 keep_name = name;
709 }
710 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
711 if (keep_fd < 0) {
712 if (errno != EEXIST)
713 die("cannot write keep file");
714 } else {
715 if (keep_msg_len > 0) {
716 write_or_die(keep_fd, keep_msg, keep_msg_len);
717 write_or_die(keep_fd, "\n", 1);
718 }
719 if (close(keep_fd) != 0)
720 die("cannot write keep file");
721 report = "keep";
722 }
723 }
724
725 if (final_pack_name != curr_pack_name) {
726 if (!final_pack_name) {
727 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
728 get_object_directory(), sha1_to_hex(sha1));
729 final_pack_name = name;
730 }
731 if (move_temp_to_file(curr_pack_name, final_pack_name))
732 die("cannot store pack file");
733 }
734
735 chmod(curr_index_name, 0444);
736 if (final_index_name != curr_index_name) {
737 if (!final_index_name) {
738 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
739 get_object_directory(), sha1_to_hex(sha1));
740 final_index_name = name;
741 }
742 if (move_temp_to_file(curr_index_name, final_index_name))
743 die("cannot store index file");
744 }
745
746 if (!from_stdin) {
747 printf("%s\n", sha1_to_hex(sha1));
748 } else {
749 char buf[48];
750 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
751 report, sha1_to_hex(sha1));
752 write_or_die(1, buf, len);
753
754 /*
755 * Let's just mimic git-unpack-objects here and write
756 * the last part of the input buffer to stdout.
757 */
758 while (input_len) {
759 err = xwrite(1, input_buffer + input_offset, input_len);
760 if (err <= 0)
761 break;
762 input_len -= err;
763 input_offset += err;
764 }
765 }
766 }
767
768 static int git_index_pack_config(const char *k, const char *v)
769 {
770 if (!strcmp(k, "pack.indexversion")) {
771 pack_idx_default_version = git_config_int(k, v);
772 if (pack_idx_default_version > 2)
773 die("bad pack.indexversion=%d", pack_idx_default_version);
774 return 0;
775 }
776 return git_default_config(k, v);
777 }
778
779 int main(int argc, char **argv)
780 {
781 int i, fix_thin_pack = 0;
782 char *curr_pack, *pack_name = NULL;
783 char *curr_index, *index_name = NULL;
784 const char *keep_name = NULL, *keep_msg = NULL;
785 char *index_name_buf = NULL, *keep_name_buf = NULL;
786 struct pack_idx_entry **idx_objects;
787 unsigned char sha1[20];
788
789 git_config(git_index_pack_config);
790
791 for (i = 1; i < argc; i++) {
792 char *arg = argv[i];
793
794 if (*arg == '-') {
795 if (!strcmp(arg, "--stdin")) {
796 from_stdin = 1;
797 } else if (!strcmp(arg, "--fix-thin")) {
798 fix_thin_pack = 1;
799 } else if (!strcmp(arg, "--strict")) {
800 strict = 1;
801 } else if (!strcmp(arg, "--keep")) {
802 keep_msg = "";
803 } else if (!prefixcmp(arg, "--keep=")) {
804 keep_msg = arg + 7;
805 } else if (!prefixcmp(arg, "--pack_header=")) {
806 struct pack_header *hdr;
807 char *c;
808
809 hdr = (struct pack_header *)input_buffer;
810 hdr->hdr_signature = htonl(PACK_SIGNATURE);
811 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
812 if (*c != ',')
813 die("bad %s", arg);
814 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
815 if (*c)
816 die("bad %s", arg);
817 input_len = sizeof(*hdr);
818 } else if (!strcmp(arg, "-v")) {
819 verbose = 1;
820 } else if (!strcmp(arg, "-o")) {
821 if (index_name || (i+1) >= argc)
822 usage(index_pack_usage);
823 index_name = argv[++i];
824 } else if (!prefixcmp(arg, "--index-version=")) {
825 char *c;
826 pack_idx_default_version = strtoul(arg + 16, &c, 10);
827 if (pack_idx_default_version > 2)
828 die("bad %s", arg);
829 if (*c == ',')
830 pack_idx_off32_limit = strtoul(c+1, &c, 0);
831 if (*c || pack_idx_off32_limit & 0x80000000)
832 die("bad %s", arg);
833 } else
834 usage(index_pack_usage);
835 continue;
836 }
837
838 if (pack_name)
839 usage(index_pack_usage);
840 pack_name = arg;
841 }
842
843 if (!pack_name && !from_stdin)
844 usage(index_pack_usage);
845 if (fix_thin_pack && !from_stdin)
846 die("--fix-thin cannot be used without --stdin");
847 if (!index_name && pack_name) {
848 int len = strlen(pack_name);
849 if (!has_extension(pack_name, ".pack"))
850 die("packfile name '%s' does not end with '.pack'",
851 pack_name);
852 index_name_buf = xmalloc(len);
853 memcpy(index_name_buf, pack_name, len - 5);
854 strcpy(index_name_buf + len - 5, ".idx");
855 index_name = index_name_buf;
856 }
857 if (keep_msg && !keep_name && pack_name) {
858 int len = strlen(pack_name);
859 if (!has_extension(pack_name, ".pack"))
860 die("packfile name '%s' does not end with '.pack'",
861 pack_name);
862 keep_name_buf = xmalloc(len);
863 memcpy(keep_name_buf, pack_name, len - 5);
864 strcpy(keep_name_buf + len - 5, ".keep");
865 keep_name = keep_name_buf;
866 }
867
868 curr_pack = open_pack_file(pack_name);
869 parse_pack_header();
870 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
871 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
872 parse_pack_objects(sha1);
873 if (nr_deltas == nr_resolved_deltas) {
874 stop_progress(&progress);
875 /* Flush remaining pack final 20-byte SHA1. */
876 flush();
877 } else {
878 if (fix_thin_pack) {
879 char msg[48];
880 int nr_unresolved = nr_deltas - nr_resolved_deltas;
881 int nr_objects_initial = nr_objects;
882 if (nr_unresolved <= 0)
883 die("confusion beyond insanity");
884 objects = xrealloc(objects,
885 (nr_objects + nr_unresolved + 1)
886 * sizeof(*objects));
887 fix_unresolved_deltas(nr_unresolved);
888 sprintf(msg, "completed with %d local objects",
889 nr_objects - nr_objects_initial);
890 stop_progress_msg(&progress, msg);
891 fixup_pack_header_footer(output_fd, sha1,
892 curr_pack, nr_objects);
893 }
894 if (nr_deltas != nr_resolved_deltas)
895 die("pack has %d unresolved deltas",
896 nr_deltas - nr_resolved_deltas);
897 }
898 free(deltas);
899 if (strict)
900 check_objects();
901
902 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
903 for (i = 0; i < nr_objects; i++)
904 idx_objects[i] = &objects[i].idx;
905 curr_index = write_idx_file(index_name, idx_objects, nr_objects, sha1);
906 free(idx_objects);
907
908 final(pack_name, curr_pack,
909 index_name, curr_index,
910 keep_name, keep_msg,
911 sha1);
912 free(objects);
913 free(index_name_buf);
914 free(keep_name_buf);
915 if (pack_name == NULL)
916 free(curr_pack);
917 if (index_name == NULL)
918 free(curr_index);
919
920 return 0;
921 }