db58e050410197f6eda4b91705e20a8bfc87b088
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"
10static const char index_pack_usage[] =
12"git-index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
13struct object_entry
15{
16 struct pack_idx_entry idx;
17 unsigned long size;
18 unsigned int hdr_size;
19 enum object_type type;
20 enum object_type real_type;
21};
22union delta_base {
24 unsigned char sha1[20];
25 off_t offset;
26};
27/*
29 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
30 * to memcmp() only the first 20 bytes.
31 */
32#define UNION_BASE_SZ 20
33struct delta_entry
35{
36 union delta_base base;
37 int obj_no;
38};
39static struct object_entry *objects;
41static struct delta_entry *deltas;
42static int nr_objects;
43static int nr_deltas;
44static int nr_resolved_deltas;
45static int from_stdin;
47static int verbose;
48static struct progress progress;
50/* We always read in 4kB chunks. */
52static unsigned char input_buffer[4096];
53static unsigned int input_offset, input_len;
54static off_t consumed_bytes;
55static SHA_CTX input_ctx;
56static uint32_t input_crc32;
57static int input_fd, output_fd, pack_fd;
58/* Discard current buffer used content. */
60static void flush(void)
61{
62 if (input_offset) {
63 if (output_fd >= 0)
64 write_or_die(output_fd, input_buffer, input_offset);
65 SHA1_Update(&input_ctx, input_buffer, input_offset);
66 memmove(input_buffer, input_buffer + input_offset, input_len);
67 input_offset = 0;
68 }
69}
70/*
72 * Make sure at least "min" bytes are available in the buffer, and
73 * return the pointer to the buffer.
74 */
75static void *fill(int min)
76{
77 if (min <= input_len)
78 return input_buffer + input_offset;
79 if (min > sizeof(input_buffer))
80 die("cannot fill %d bytes", min);
81 flush();
82 do {
83 ssize_t ret = xread(input_fd, input_buffer + input_len,
84 sizeof(input_buffer) - input_len);
85 if (ret <= 0) {
86 if (!ret)
87 die("early EOF");
88 die("read error on input: %s", strerror(errno));
89 }
90 input_len += ret;
91 } while (input_len < min);
92 return input_buffer;
93}
94static void use(int bytes)
96{
97 if (bytes > input_len)
98 die("used more bytes than were available");
99 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
100 input_len -= bytes;
101 input_offset += bytes;
102 /* make sure off_t is sufficiently large not to wrap */
104 if (consumed_bytes > consumed_bytes + bytes)
105 die("pack too large for current definition of off_t");
106 consumed_bytes += bytes;
107}
108static const char *open_pack_file(const char *pack_name)
110{
111 if (from_stdin) {
112 input_fd = 0;
113 if (!pack_name) {
114 static char tmpfile[PATH_MAX];
115 snprintf(tmpfile, sizeof(tmpfile),
116 "%s/tmp_pack_XXXXXX", get_object_directory());
117 output_fd = xmkstemp(tmpfile);
118 pack_name = xstrdup(tmpfile);
119 } else
120 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
121 if (output_fd < 0)
122 die("unable to create %s: %s\n", pack_name, strerror(errno));
123 pack_fd = output_fd;
124 } else {
125 input_fd = open(pack_name, O_RDONLY);
126 if (input_fd < 0)
127 die("cannot open packfile '%s': %s",
128 pack_name, strerror(errno));
129 output_fd = -1;
130 pack_fd = input_fd;
131 }
132 SHA1_Init(&input_ctx);
133 return pack_name;
134}
135static void parse_pack_header(void)
137{
138 struct pack_header *hdr = fill(sizeof(struct pack_header));
139 /* Header consistency check */
141 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
142 die("pack signature mismatch");
143 if (!pack_version_ok(hdr->hdr_version))
144 die("pack version %d unsupported", ntohl(hdr->hdr_version));
145 nr_objects = ntohl(hdr->hdr_entries);
147 use(sizeof(struct pack_header));
148}
149static void bad_object(unsigned long offset, const char *format,
151 ...) NORETURN __attribute__((format (printf, 2, 3)));
152static void bad_object(unsigned long offset, const char *format, ...)
154{
155 va_list params;
156 char buf[1024];
157 va_start(params, format);
159 vsnprintf(buf, sizeof(buf), format, params);
160 va_end(params);
161 die("pack has bad object at offset %lu: %s", offset, buf);
162}
163static void *unpack_entry_data(unsigned long offset, unsigned long size)
165{
166 z_stream stream;
167 void *buf = xmalloc(size);
168 memset(&stream, 0, sizeof(stream));
170 stream.next_out = buf;
171 stream.avail_out = size;
172 stream.next_in = fill(1);
173 stream.avail_in = input_len;
174 inflateInit(&stream);
175 for (;;) {
177 int ret = inflate(&stream, 0);
178 use(input_len - stream.avail_in);
179 if (stream.total_out == size && ret == Z_STREAM_END)
180 break;
181 if (ret != Z_OK)
182 bad_object(offset, "inflate returned %d", ret);
183 stream.next_in = fill(1);
184 stream.avail_in = input_len;
185 }
186 inflateEnd(&stream);
187 return buf;
188}
189static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
191{
192 unsigned char *p, c;
193 unsigned long size;
194 off_t base_offset;
195 unsigned shift;
196 void *data;
197 obj->idx.offset = consumed_bytes;
199 input_crc32 = crc32(0, Z_NULL, 0);
200 p = fill(1);
202 c = *p;
203 use(1);
204 obj->type = (c >> 4) & 7;
205 size = (c & 15);
206 shift = 4;
207 while (c & 0x80) {
208 p = fill(1);
209 c = *p;
210 use(1);
211 size += (c & 0x7fUL) << shift;
212 shift += 7;
213 }
214 obj->size = size;
215 switch (obj->type) {
217 case OBJ_REF_DELTA:
218 hashcpy(delta_base->sha1, fill(20));
219 use(20);
220 break;
221 case OBJ_OFS_DELTA:
222 memset(delta_base, 0, sizeof(*delta_base));
223 p = fill(1);
224 c = *p;
225 use(1);
226 base_offset = c & 127;
227 while (c & 128) {
228 base_offset += 1;
229 if (!base_offset || MSB(base_offset, 7))
230 bad_object(obj->idx.offset, "offset value overflow for delta base object");
231 p = fill(1);
232 c = *p;
233 use(1);
234 base_offset = (base_offset << 7) + (c & 127);
235 }
236 delta_base->offset = obj->idx.offset - base_offset;
237 if (delta_base->offset >= obj->idx.offset)
238 bad_object(obj->idx.offset, "delta base offset is out of bound");
239 break;
240 case OBJ_COMMIT:
241 case OBJ_TREE:
242 case OBJ_BLOB:
243 case OBJ_TAG:
244 break;
245 default:
246 bad_object(obj->idx.offset, "unknown object type %d", obj->type);
247 }
248 obj->hdr_size = consumed_bytes - obj->idx.offset;
249 data = unpack_entry_data(obj->idx.offset, obj->size);
251 obj->idx.crc32 = input_crc32;
252 return data;
253}
254static void *get_data_from_pack(struct object_entry *obj)
256{
257 unsigned long from = obj[0].idx.offset + obj[0].hdr_size;
258 unsigned long len = obj[1].idx.offset - from;
259 unsigned long rdy = 0;
260 unsigned char *src, *data;
261 z_stream stream;
262 int st;
263 src = xmalloc(len);
265 data = src;
266 do {
267 ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
268 if (n <= 0)
269 die("cannot pread pack file: %s", strerror(errno));
270 rdy += n;
271 } while (rdy < len);
272 data = xmalloc(obj->size);
273 memset(&stream, 0, sizeof(stream));
274 stream.next_out = data;
275 stream.avail_out = obj->size;
276 stream.next_in = src;
277 stream.avail_in = len;
278 inflateInit(&stream);
279 while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
280 inflateEnd(&stream);
281 if (st != Z_STREAM_END || stream.total_out != obj->size)
282 die("serious inflate inconsistency");
283 free(src);
284 return data;
285}
286static int find_delta(const union delta_base *base)
288{
289 int first = 0, last = nr_deltas;
290 while (first < last) {
292 int next = (first + last) / 2;
293 struct delta_entry *delta = &deltas[next];
294 int cmp;
295 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
297 if (!cmp)
298 return next;
299 if (cmp < 0) {
300 last = next;
301 continue;
302 }
303 first = next+1;
304 }
305 return -first-1;
306}
307static int find_delta_children(const union delta_base *base,
309 int *first_index, int *last_index)
310{
311 int first = find_delta(base);
312 int last = first;
313 int end = nr_deltas - 1;
314 if (first < 0)
316 return -1;
317 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
318 --first;
319 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
320 ++last;
321 *first_index = first;
322 *last_index = last;
323 return 0;
324}
325static void sha1_object(const void *data, unsigned long size,
327 enum object_type type, unsigned char *sha1)
328{
329 hash_sha1_file(data, size, typename(type), sha1);
330 if (has_sha1_file(sha1)) {
331 void *has_data;
332 enum object_type has_type;
333 unsigned long has_size;
334 has_data = read_sha1_file(sha1, &has_type, &has_size);
335 if (!has_data)
336 die("cannot read existing object %s", sha1_to_hex(sha1));
337 if (size != has_size || type != has_type ||
338 memcmp(data, has_data, size) != 0)
339 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
340 free(has_data);
341 }
342}
343static void resolve_delta(struct object_entry *delta_obj, void *base_data,
345 unsigned long base_size, enum object_type type)
346{
347 void *delta_data;
348 unsigned long delta_size;
349 void *result;
350 unsigned long result_size;
351 union delta_base delta_base;
352 int j, first, last;
353 delta_obj->real_type = type;
355 delta_data = get_data_from_pack(delta_obj);
356 delta_size = delta_obj->size;
357 result = patch_delta(base_data, base_size, delta_data, delta_size,
358 &result_size);
359 free(delta_data);
360 if (!result)
361 bad_object(delta_obj->idx.offset, "failed to apply delta");
362 sha1_object(result, result_size, type, delta_obj->idx.sha1);
363 nr_resolved_deltas++;
364 hashcpy(delta_base.sha1, delta_obj->idx.sha1);
366 if (!find_delta_children(&delta_base, &first, &last)) {
367 for (j = first; j <= last; j++) {
368 struct object_entry *child = objects + deltas[j].obj_no;
369 if (child->real_type == OBJ_REF_DELTA)
370 resolve_delta(child, result, result_size, type);
371 }
372 }
373 memset(&delta_base, 0, sizeof(delta_base));
375 delta_base.offset = delta_obj->idx.offset;
376 if (!find_delta_children(&delta_base, &first, &last)) {
377 for (j = first; j <= last; j++) {
378 struct object_entry *child = objects + deltas[j].obj_no;
379 if (child->real_type == OBJ_OFS_DELTA)
380 resolve_delta(child, result, result_size, type);
381 }
382 }
383 free(result);
385}
386static int compare_delta_entry(const void *a, const void *b)
388{
389 const struct delta_entry *delta_a = a;
390 const struct delta_entry *delta_b = b;
391 return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
392}
393/* Parse all objects and return the pack content SHA1 hash */
395static void parse_pack_objects(unsigned char *sha1)
396{
397 int i;
398 struct delta_entry *delta = deltas;
399 void *data;
400 struct stat st;
401 /*
403 * First pass:
404 * - find locations of all objects;
405 * - calculate SHA1 of all non-delta objects;
406 * - remember base (SHA1 or offset) for all deltas.
407 */
408 if (verbose)
409 start_progress(&progress, "Indexing %u objects...", "", nr_objects);
410 for (i = 0; i < nr_objects; i++) {
411 struct object_entry *obj = &objects[i];
412 data = unpack_raw_entry(obj, &delta->base);
413 obj->real_type = obj->type;
414 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
415 nr_deltas++;
416 delta->obj_no = i;
417 delta++;
418 } else
419 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
420 free(data);
421 if (verbose)
422 display_progress(&progress, i+1);
423 }
424 objects[i].idx.offset = consumed_bytes;
425 if (verbose)
426 stop_progress(&progress);
427 /* Check pack integrity */
429 flush();
430 SHA1_Final(sha1, &input_ctx);
431 if (hashcmp(fill(20), sha1))
432 die("pack is corrupted (SHA1 mismatch)");
433 use(20);
434 /* If input_fd is a file, we should have reached its end now. */
436 if (fstat(input_fd, &st))
437 die("cannot fstat packfile: %s", strerror(errno));
438 if (S_ISREG(st.st_mode) &&
439 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
440 die("pack has junk at the end");
441 if (!nr_deltas)
443 return;
444 /* Sort deltas by base SHA1/offset for fast searching */
446 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
447 compare_delta_entry);
448 /*
450 * Second pass:
451 * - for all non-delta objects, look if it is used as a base for
452 * deltas;
453 * - if used as a base, uncompress the object and apply all deltas,
454 * recursively checking if the resulting object is used as a base
455 * for some more deltas.
456 */
457 if (verbose)
458 start_progress(&progress, "Resolving %u deltas...", "", nr_deltas);
459 for (i = 0; i < nr_objects; i++) {
460 struct object_entry *obj = &objects[i];
461 union delta_base base;
462 int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
463 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
465 continue;
466 hashcpy(base.sha1, obj->idx.sha1);
467 ref = !find_delta_children(&base, &ref_first, &ref_last);
468 memset(&base, 0, sizeof(base));
469 base.offset = obj->idx.offset;
470 ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
471 if (!ref && !ofs)
472 continue;
473 data = get_data_from_pack(obj);
474 if (ref)
475 for (j = ref_first; j <= ref_last; j++) {
476 struct object_entry *child = objects + deltas[j].obj_no;
477 if (child->real_type == OBJ_REF_DELTA)
478 resolve_delta(child, data,
479 obj->size, obj->type);
480 }
481 if (ofs)
482 for (j = ofs_first; j <= ofs_last; j++) {
483 struct object_entry *child = objects + deltas[j].obj_no;
484 if (child->real_type == OBJ_OFS_DELTA)
485 resolve_delta(child, data,
486 obj->size, obj->type);
487 }
488 free(data);
489 if (verbose)
490 display_progress(&progress, nr_resolved_deltas);
491 }
492}
493static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
495{
496 z_stream stream;
497 unsigned long maxsize;
498 void *out;
499 memset(&stream, 0, sizeof(stream));
501 deflateInit(&stream, zlib_compression_level);
502 maxsize = deflateBound(&stream, size);
503 out = xmalloc(maxsize);
504 /* Compress it */
506 stream.next_in = in;
507 stream.avail_in = size;
508 stream.next_out = out;
509 stream.avail_out = maxsize;
510 while (deflate(&stream, Z_FINISH) == Z_OK);
511 deflateEnd(&stream);
512 size = stream.total_out;
514 write_or_die(fd, out, size);
515 *obj_crc = crc32(*obj_crc, out, size);
516 free(out);
517 return size;
518}
519static void append_obj_to_pack(const unsigned char *sha1, void *buf,
521 unsigned long size, enum object_type type)
522{
523 struct object_entry *obj = &objects[nr_objects++];
524 unsigned char header[10];
525 unsigned long s = size;
526 int n = 0;
527 unsigned char c = (type << 4) | (s & 15);
528 s >>= 4;
529 while (s) {
530 header[n++] = c | 0x80;
531 c = s & 0x7f;
532 s >>= 7;
533 }
534 header[n++] = c;
535 write_or_die(output_fd, header, n);
536 obj[0].idx.crc32 = crc32(0, Z_NULL, 0);
537 obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n);
538 obj[1].idx.offset = obj[0].idx.offset + n;
539 obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
540 hashcpy(obj->idx.sha1, sha1);
541}
542static int delta_pos_compare(const void *_a, const void *_b)
544{
545 struct delta_entry *a = *(struct delta_entry **)_a;
546 struct delta_entry *b = *(struct delta_entry **)_b;
547 return a->obj_no - b->obj_no;
548}
549static void fix_unresolved_deltas(int nr_unresolved)
551{
552 struct delta_entry **sorted_by_pos;
553 int i, n = 0;
554 /*
556 * Since many unresolved deltas may well be themselves base objects
557 * for more unresolved deltas, we really want to include the
558 * smallest number of base objects that would cover as much delta
559 * as possible by picking the
560 * trunc deltas first, allowing for other deltas to resolve without
561 * additional base objects. Since most base objects are to be found
562 * before deltas depending on them, a good heuristic is to start
563 * resolving deltas in the same order as their position in the pack.
564 */
565 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
566 for (i = 0; i < nr_deltas; i++) {
567 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
568 continue;
569 sorted_by_pos[n++] = &deltas[i];
570 }
571 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
572 for (i = 0; i < n; i++) {
574 struct delta_entry *d = sorted_by_pos[i];
575 void *data;
576 unsigned long size;
577 enum object_type type;
578 int j, first, last;
579 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
581 continue;
582 data = read_sha1_file(d->base.sha1, &type, &size);
583 if (!data)
584 continue;
585 find_delta_children(&d->base, &first, &last);
587 for (j = first; j <= last; j++) {
588 struct object_entry *child = objects + deltas[j].obj_no;
589 if (child->real_type == OBJ_REF_DELTA)
590 resolve_delta(child, data, size, type);
591 }
592 if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
594 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
595 append_obj_to_pack(d->base.sha1, data, size, type);
596 free(data);
597 if (verbose)
598 display_progress(&progress, nr_resolved_deltas);
599 }
600 free(sorted_by_pos);
601}
602static void final(const char *final_pack_name, const char *curr_pack_name,
604 const char *final_index_name, const char *curr_index_name,
605 const char *keep_name, const char *keep_msg,
606 unsigned char *sha1)
607{
608 const char *report = "pack";
609 char name[PATH_MAX];
610 int err;
611 if (!from_stdin) {
613 close(input_fd);
614 } else {
615 err = close(output_fd);
616 if (err)
617 die("error while closing pack file: %s", strerror(errno));
618 chmod(curr_pack_name, 0444);
619 }
620 if (keep_msg) {
622 int keep_fd, keep_msg_len = strlen(keep_msg);
623 if (!keep_name) {
624 snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
625 get_object_directory(), sha1_to_hex(sha1));
626 keep_name = name;
627 }
628 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
629 if (keep_fd < 0) {
630 if (errno != EEXIST)
631 die("cannot write keep file");
632 } else {
633 if (keep_msg_len > 0) {
634 write_or_die(keep_fd, keep_msg, keep_msg_len);
635 write_or_die(keep_fd, "\n", 1);
636 }
637 if (close(keep_fd) != 0)
638 die("cannot write keep file");
639 report = "keep";
640 }
641 }
642 if (final_pack_name != curr_pack_name) {
644 if (!final_pack_name) {
645 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
646 get_object_directory(), sha1_to_hex(sha1));
647 final_pack_name = name;
648 }
649 if (move_temp_to_file(curr_pack_name, final_pack_name))
650 die("cannot store pack file");
651 }
652 chmod(curr_index_name, 0444);
654 if (final_index_name != curr_index_name) {
655 if (!final_index_name) {
656 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
657 get_object_directory(), sha1_to_hex(sha1));
658 final_index_name = name;
659 }
660 if (move_temp_to_file(curr_index_name, final_index_name))
661 die("cannot store index file");
662 }
663 if (!from_stdin) {
665 printf("%s\n", sha1_to_hex(sha1));
666 } else {
667 char buf[48];
668 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
669 report, sha1_to_hex(sha1));
670 write_or_die(1, buf, len);
671 /*
673 * Let's just mimic git-unpack-objects here and write
674 * the last part of the input buffer to stdout.
675 */
676 while (input_len) {
677 err = xwrite(1, input_buffer + input_offset, input_len);
678 if (err <= 0)
679 break;
680 input_len -= err;
681 input_offset += err;
682 }
683 }
684}
685int main(int argc, char **argv)
687{
688 int i, fix_thin_pack = 0;
689 const char *curr_pack, *pack_name = NULL;
690 const char *curr_index, *index_name = NULL;
691 const char *keep_name = NULL, *keep_msg = NULL;
692 char *index_name_buf = NULL, *keep_name_buf = NULL;
693 struct pack_idx_entry **idx_objects;
694 unsigned char sha1[20];
695 for (i = 1; i < argc; i++) {
697 const char *arg = argv[i];
698 if (*arg == '-') {
700 if (!strcmp(arg, "--stdin")) {
701 from_stdin = 1;
702 } else if (!strcmp(arg, "--fix-thin")) {
703 fix_thin_pack = 1;
704 } else if (!strcmp(arg, "--keep")) {
705 keep_msg = "";
706 } else if (!prefixcmp(arg, "--keep=")) {
707 keep_msg = arg + 7;
708 } else if (!prefixcmp(arg, "--pack_header=")) {
709 struct pack_header *hdr;
710 char *c;
711 hdr = (struct pack_header *)input_buffer;
713 hdr->hdr_signature = htonl(PACK_SIGNATURE);
714 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
715 if (*c != ',')
716 die("bad %s", arg);
717 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
718 if (*c)
719 die("bad %s", arg);
720 input_len = sizeof(*hdr);
721 } else if (!strcmp(arg, "-v")) {
722 verbose = 1;
723 } else if (!strcmp(arg, "-o")) {
724 if (index_name || (i+1) >= argc)
725 usage(index_pack_usage);
726 index_name = argv[++i];
727 } else if (!prefixcmp(arg, "--index-version=")) {
728 char *c;
729 pack_idx_default_version = strtoul(arg + 16, &c, 10);
730 if (pack_idx_default_version > 2)
731 die("bad %s", arg);
732 if (*c == ',')
733 pack_idx_off32_limit = strtoul(c+1, &c, 0);
734 if (*c || pack_idx_off32_limit & 0x80000000)
735 die("bad %s", arg);
736 } else
737 usage(index_pack_usage);
738 continue;
739 }
740 if (pack_name)
742 usage(index_pack_usage);
743 pack_name = arg;
744 }
745 if (!pack_name && !from_stdin)
747 usage(index_pack_usage);
748 if (fix_thin_pack && !from_stdin)
749 die("--fix-thin cannot be used without --stdin");
750 if (!index_name && pack_name) {
751 int len = strlen(pack_name);
752 if (!has_extension(pack_name, ".pack"))
753 die("packfile name '%s' does not end with '.pack'",
754 pack_name);
755 index_name_buf = xmalloc(len);
756 memcpy(index_name_buf, pack_name, len - 5);
757 strcpy(index_name_buf + len - 5, ".idx");
758 index_name = index_name_buf;
759 }
760 if (keep_msg && !keep_name && pack_name) {
761 int len = strlen(pack_name);
762 if (!has_extension(pack_name, ".pack"))
763 die("packfile name '%s' does not end with '.pack'",
764 pack_name);
765 keep_name_buf = xmalloc(len);
766 memcpy(keep_name_buf, pack_name, len - 5);
767 strcpy(keep_name_buf + len - 5, ".keep");
768 keep_name = keep_name_buf;
769 }
770 curr_pack = open_pack_file(pack_name);
772 parse_pack_header();
773 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
774 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
775 parse_pack_objects(sha1);
776 if (nr_deltas == nr_resolved_deltas) {
777 if (verbose)
778 stop_progress(&progress);
779 /* Flush remaining pack final 20-byte SHA1. */
780 flush();
781 } else {
782 if (fix_thin_pack) {
783 int nr_unresolved = nr_deltas - nr_resolved_deltas;
784 int nr_objects_initial = nr_objects;
785 if (nr_unresolved <= 0)
786 die("confusion beyond insanity");
787 objects = xrealloc(objects,
788 (nr_objects + nr_unresolved + 1)
789 * sizeof(*objects));
790 fix_unresolved_deltas(nr_unresolved);
791 if (verbose) {
792 stop_progress(&progress);
793 fprintf(stderr, "%d objects were added to complete this thin pack.\n",
794 nr_objects - nr_objects_initial);
795 }
796 fixup_pack_header_footer(output_fd, sha1,
797 curr_pack, nr_objects);
798 }
799 if (nr_deltas != nr_resolved_deltas)
800 die("pack has %d unresolved deltas",
801 nr_deltas - nr_resolved_deltas);
802 }
803 free(deltas);
804 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
806 for (i = 0; i < nr_objects; i++)
807 idx_objects[i] = &objects[i].idx;
808 curr_index = write_idx_file(index_name, idx_objects, nr_objects, sha1);
809 free(idx_objects);
810 final(pack_name, curr_pack,
812 index_name, curr_index,
813 keep_name, keep_msg,
814 sha1);
815 free(objects);
816 free(index_name_buf);
817 free(keep_name_buf);
818 return 0;
820}