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"
11static const char index_pack_usage[] =
13"git-index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] [--strict] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
14struct 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};
23union delta_base {
25 unsigned char sha1[20];
26 off_t offset;
27};
28/*
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#define FLAG_LINK (1u<<20)
36#define FLAG_CHECKED (1u<<21)
37struct delta_entry
39{
40 union delta_base base;
41 int obj_no;
42};
43static struct object_entry *objects;
45static struct delta_entry *deltas;
46static int nr_objects;
47static int nr_deltas;
48static int nr_resolved_deltas;
49static int from_stdin;
51static int strict;
52static int verbose;
53static struct progress *progress;
55/* We always read in 4kB chunks. */
57static unsigned char input_buffer[4096];
58static unsigned int input_offset, input_len;
59static off_t consumed_bytes;
60static SHA_CTX input_ctx;
61static uint32_t input_crc32;
62static int input_fd, output_fd, pack_fd;
63static int mark_link(struct object *obj, int type, void *data)
65{
66 if (!obj)
67 return -1;
68 if (type != OBJ_ANY && obj->type != type)
70 die("object type mismatch at %s", sha1_to_hex(obj->sha1));
71 obj->flags |= FLAG_LINK;
73 return 0;
74}
75/* The content of each linked object must have been checked
77 or it must be already present in the object database */
78static void check_object(struct object *obj)
79{
80 if (!obj)
81 return;
82 if (!(obj->flags & FLAG_LINK))
84 return;
85 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}
95static void check_objects(void)
97{
98 unsigned i, max;
99 max = get_max_object_index();
101 for (i = 0; i < max; i++)
102 check_object(get_indexed_object(i));
103}
104/* Discard current buffer used content. */
107static 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/*
119 * Make sure at least "min" bytes are available in the buffer, and
120 * return the pointer to the buffer.
121 */
122static 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}
143static 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 /* 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}
157static 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}
184static void parse_pack_header(void)
186{
187 struct pack_header *hdr = fill(sizeof(struct pack_header));
188 /* 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 %"PRIu32" unsupported",
194 ntohl(hdr->hdr_version));
195 nr_objects = ntohl(hdr->hdr_entries);
197 use(sizeof(struct pack_header));
198}
199static void bad_object(unsigned long offset, const char *format,
201 ...) NORETURN __attribute__((format (printf, 2, 3)));
202static void bad_object(unsigned long offset, const char *format, ...)
204{
205 va_list params;
206 char buf[1024];
207 va_start(params, format);
209 vsnprintf(buf, sizeof(buf), format, params);
210 va_end(params);
211 die("pack has bad object at offset %lu: %s", offset, buf);
212}
213static void *unpack_entry_data(unsigned long offset, unsigned long size)
215{
216 z_stream stream;
217 void *buf = xmalloc(size);
218 memset(&stream, 0, sizeof(stream));
220 stream.next_out = buf;
221 stream.avail_out = size;
222 stream.next_in = fill(1);
223 stream.avail_in = input_len;
224 inflateInit(&stream);
225 for (;;) {
227 int ret = inflate(&stream, 0);
228 use(input_len - stream.avail_in);
229 if (stream.total_out == size && ret == Z_STREAM_END)
230 break;
231 if (ret != Z_OK)
232 bad_object(offset, "inflate returned %d", ret);
233 stream.next_in = fill(1);
234 stream.avail_in = input_len;
235 }
236 inflateEnd(&stream);
237 return buf;
238}
239static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
241{
242 unsigned char *p, c;
243 unsigned long size;
244 off_t base_offset;
245 unsigned shift;
246 void *data;
247 obj->idx.offset = consumed_bytes;
249 input_crc32 = crc32(0, Z_NULL, 0);
250 p = fill(1);
252 c = *p;
253 use(1);
254 obj->type = (c >> 4) & 7;
255 size = (c & 15);
256 shift = 4;
257 while (c & 0x80) {
258 p = fill(1);
259 c = *p;
260 use(1);
261 size += (c & 0x7fUL) << shift;
262 shift += 7;
263 }
264 obj->size = size;
265 switch (obj->type) {
267 case OBJ_REF_DELTA:
268 hashcpy(delta_base->sha1, fill(20));
269 use(20);
270 break;
271 case OBJ_OFS_DELTA:
272 memset(delta_base, 0, sizeof(*delta_base));
273 p = fill(1);
274 c = *p;
275 use(1);
276 base_offset = c & 127;
277 while (c & 128) {
278 base_offset += 1;
279 if (!base_offset || MSB(base_offset, 7))
280 bad_object(obj->idx.offset, "offset value overflow for delta base object");
281 p = fill(1);
282 c = *p;
283 use(1);
284 base_offset = (base_offset << 7) + (c & 127);
285 }
286 delta_base->offset = obj->idx.offset - base_offset;
287 if (delta_base->offset >= obj->idx.offset)
288 bad_object(obj->idx.offset, "delta base offset is out of bound");
289 break;
290 case OBJ_COMMIT:
291 case OBJ_TREE:
292 case OBJ_BLOB:
293 case OBJ_TAG:
294 break;
295 default:
296 bad_object(obj->idx.offset, "unknown object type %d", obj->type);
297 }
298 obj->hdr_size = consumed_bytes - obj->idx.offset;
299 data = unpack_entry_data(obj->idx.offset, obj->size);
301 obj->idx.crc32 = input_crc32;
302 return data;
303}
304static void *get_data_from_pack(struct object_entry *obj)
306{
307 off_t from = obj[0].idx.offset + obj[0].hdr_size;
308 unsigned long len = obj[1].idx.offset - from;
309 unsigned long rdy = 0;
310 unsigned char *src, *data;
311 z_stream stream;
312 int st;
313 src = xmalloc(len);
315 data = src;
316 do {
317 ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
318 if (n <= 0)
319 die("cannot pread pack file: %s", strerror(errno));
320 rdy += n;
321 } while (rdy < len);
322 data = xmalloc(obj->size);
323 memset(&stream, 0, sizeof(stream));
324 stream.next_out = data;
325 stream.avail_out = obj->size;
326 stream.next_in = src;
327 stream.avail_in = len;
328 inflateInit(&stream);
329 while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
330 inflateEnd(&stream);
331 if (st != Z_STREAM_END || stream.total_out != obj->size)
332 die("serious inflate inconsistency");
333 free(src);
334 return data;
335}
336static int find_delta(const union delta_base *base)
338{
339 int first = 0, last = nr_deltas;
340 while (first < last) {
342 int next = (first + last) / 2;
343 struct delta_entry *delta = &deltas[next];
344 int cmp;
345 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
347 if (!cmp)
348 return next;
349 if (cmp < 0) {
350 last = next;
351 continue;
352 }
353 first = next+1;
354 }
355 return -first-1;
356}
357static int find_delta_children(const union delta_base *base,
359 int *first_index, int *last_index)
360{
361 int first = find_delta(base);
362 int last = first;
363 int end = nr_deltas - 1;
364 if (first < 0)
366 return -1;
367 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
368 --first;
369 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
370 ++last;
371 *first_index = first;
372 *last_index = last;
373 return 0;
374}
375static void sha1_object(const void *data, unsigned long size,
377 enum object_type type, unsigned char *sha1)
378{
379 hash_sha1_file(data, size, typename(type), sha1);
380 if (has_sha1_file(sha1)) {
381 void *has_data;
382 enum object_type has_type;
383 unsigned long has_size;
384 has_data = read_sha1_file(sha1, &has_type, &has_size);
385 if (!has_data)
386 die("cannot read existing object %s", sha1_to_hex(sha1));
387 if (size != has_size || type != has_type ||
388 memcmp(data, has_data, size) != 0)
389 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
390 free(has_data);
391 }
392 if (strict) {
393 if (type == OBJ_BLOB) {
394 struct blob *blob = lookup_blob(sha1);
395 if (blob)
396 blob->object.flags |= FLAG_CHECKED;
397 else
398 die("invalid blob object %s", sha1_to_hex(sha1));
399 } else {
400 struct object *obj;
401 int eaten;
402 void *buf = (void *) data;
403 /*
405 * we do not need to free the memory here, as the
406 * buf is deleted by the caller.
407 */
408 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
409 if (!obj)
410 die("invalid %s", typename(type));
411 if (fsck_object(obj, 1, fsck_error_function))
412 die("Error in object");
413 if (fsck_walk(obj, mark_link, 0))
414 die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
415 if (obj->type == OBJ_TREE) {
417 struct tree *item = (struct tree *) obj;
418 item->buffer = NULL;
419 }
420 if (obj->type == OBJ_COMMIT) {
421 struct commit *commit = (struct commit *) obj;
422 commit->buffer = NULL;
423 }
424 obj->flags |= FLAG_CHECKED;
425 }
426 }
427}
428static void resolve_delta(struct object_entry *delta_obj, void *base_data,
430 unsigned long base_size, enum object_type type)
431{
432 void *delta_data;
433 unsigned long delta_size;
434 void *result;
435 unsigned long result_size;
436 union delta_base delta_base;
437 int j, first, last;
438 delta_obj->real_type = type;
440 delta_data = get_data_from_pack(delta_obj);
441 delta_size = delta_obj->size;
442 result = patch_delta(base_data, base_size, delta_data, delta_size,
443 &result_size);
444 free(delta_data);
445 if (!result)
446 bad_object(delta_obj->idx.offset, "failed to apply delta");
447 sha1_object(result, result_size, type, delta_obj->idx.sha1);
448 nr_resolved_deltas++;
449 hashcpy(delta_base.sha1, delta_obj->idx.sha1);
451 if (!find_delta_children(&delta_base, &first, &last)) {
452 for (j = first; j <= last; j++) {
453 struct object_entry *child = objects + deltas[j].obj_no;
454 if (child->real_type == OBJ_REF_DELTA)
455 resolve_delta(child, result, result_size, type);
456 }
457 }
458 memset(&delta_base, 0, sizeof(delta_base));
460 delta_base.offset = delta_obj->idx.offset;
461 if (!find_delta_children(&delta_base, &first, &last)) {
462 for (j = first; j <= last; j++) {
463 struct object_entry *child = objects + deltas[j].obj_no;
464 if (child->real_type == OBJ_OFS_DELTA)
465 resolve_delta(child, result, result_size, type);
466 }
467 }
468 free(result);
470}
471static int compare_delta_entry(const void *a, const void *b)
473{
474 const struct delta_entry *delta_a = a;
475 const struct delta_entry *delta_b = b;
476 return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
477}
478/* Parse all objects and return the pack content SHA1 hash */
480static void parse_pack_objects(unsigned char *sha1)
481{
482 int i;
483 struct delta_entry *delta = deltas;
484 void *data;
485 struct stat st;
486 /*
488 * First pass:
489 * - find locations of all objects;
490 * - calculate SHA1 of all non-delta objects;
491 * - remember base (SHA1 or offset) for all deltas.
492 */
493 if (verbose)
494 progress = start_progress(
495 from_stdin ? "Receiving objects" : "Indexing objects",
496 nr_objects);
497 for (i = 0; i < nr_objects; i++) {
498 struct object_entry *obj = &objects[i];
499 data = unpack_raw_entry(obj, &delta->base);
500 obj->real_type = obj->type;
501 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
502 nr_deltas++;
503 delta->obj_no = i;
504 delta++;
505 } else
506 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
507 free(data);
508 display_progress(progress, i+1);
509 }
510 objects[i].idx.offset = consumed_bytes;
511 stop_progress(&progress);
512 /* Check pack integrity */
514 flush();
515 SHA1_Final(sha1, &input_ctx);
516 if (hashcmp(fill(20), sha1))
517 die("pack is corrupted (SHA1 mismatch)");
518 use(20);
519 /* If input_fd is a file, we should have reached its end now. */
521 if (fstat(input_fd, &st))
522 die("cannot fstat packfile: %s", strerror(errno));
523 if (S_ISREG(st.st_mode) &&
524 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
525 die("pack has junk at the end");
526 if (!nr_deltas)
528 return;
529 /* Sort deltas by base SHA1/offset for fast searching */
531 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
532 compare_delta_entry);
533 /*
535 * Second pass:
536 * - for all non-delta objects, look if it is used as a base for
537 * deltas;
538 * - if used as a base, uncompress the object and apply all deltas,
539 * recursively checking if the resulting object is used as a base
540 * for some more deltas.
541 */
542 if (verbose)
543 progress = start_progress("Resolving deltas", nr_deltas);
544 for (i = 0; i < nr_objects; i++) {
545 struct object_entry *obj = &objects[i];
546 union delta_base base;
547 int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
548 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
550 continue;
551 hashcpy(base.sha1, obj->idx.sha1);
552 ref = !find_delta_children(&base, &ref_first, &ref_last);
553 memset(&base, 0, sizeof(base));
554 base.offset = obj->idx.offset;
555 ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
556 if (!ref && !ofs)
557 continue;
558 data = get_data_from_pack(obj);
559 if (ref)
560 for (j = ref_first; j <= ref_last; j++) {
561 struct object_entry *child = objects + deltas[j].obj_no;
562 if (child->real_type == OBJ_REF_DELTA)
563 resolve_delta(child, data,
564 obj->size, obj->type);
565 }
566 if (ofs)
567 for (j = ofs_first; j <= ofs_last; j++) {
568 struct object_entry *child = objects + deltas[j].obj_no;
569 if (child->real_type == OBJ_OFS_DELTA)
570 resolve_delta(child, data,
571 obj->size, obj->type);
572 }
573 free(data);
574 display_progress(progress, nr_resolved_deltas);
575 }
576}
577static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
579{
580 z_stream stream;
581 unsigned long maxsize;
582 void *out;
583 memset(&stream, 0, sizeof(stream));
585 deflateInit(&stream, zlib_compression_level);
586 maxsize = deflateBound(&stream, size);
587 out = xmalloc(maxsize);
588 /* Compress it */
590 stream.next_in = in;
591 stream.avail_in = size;
592 stream.next_out = out;
593 stream.avail_out = maxsize;
594 while (deflate(&stream, Z_FINISH) == Z_OK);
595 deflateEnd(&stream);
596 size = stream.total_out;
598 write_or_die(fd, out, size);
599 *obj_crc = crc32(*obj_crc, out, size);
600 free(out);
601 return size;
602}
603static void append_obj_to_pack(const unsigned char *sha1, void *buf,
605 unsigned long size, enum object_type type)
606{
607 struct object_entry *obj = &objects[nr_objects++];
608 unsigned char header[10];
609 unsigned long s = size;
610 int n = 0;
611 unsigned char c = (type << 4) | (s & 15);
612 s >>= 4;
613 while (s) {
614 header[n++] = c | 0x80;
615 c = s & 0x7f;
616 s >>= 7;
617 }
618 header[n++] = c;
619 write_or_die(output_fd, header, n);
620 obj[0].idx.crc32 = crc32(0, Z_NULL, 0);
621 obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n);
622 obj[1].idx.offset = obj[0].idx.offset + n;
623 obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
624 hashcpy(obj->idx.sha1, sha1);
625}
626static int delta_pos_compare(const void *_a, const void *_b)
628{
629 struct delta_entry *a = *(struct delta_entry **)_a;
630 struct delta_entry *b = *(struct delta_entry **)_b;
631 return a->obj_no - b->obj_no;
632}
633static void fix_unresolved_deltas(int nr_unresolved)
635{
636 struct delta_entry **sorted_by_pos;
637 int i, n = 0;
638 /*
640 * Since many unresolved deltas may well be themselves base objects
641 * for more unresolved deltas, we really want to include the
642 * smallest number of base objects that would cover as much delta
643 * as possible by picking the
644 * trunc deltas first, allowing for other deltas to resolve without
645 * additional base objects. Since most base objects are to be found
646 * before deltas depending on them, a good heuristic is to start
647 * resolving deltas in the same order as their position in the pack.
648 */
649 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
650 for (i = 0; i < nr_deltas; i++) {
651 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
652 continue;
653 sorted_by_pos[n++] = &deltas[i];
654 }
655 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
656 for (i = 0; i < n; i++) {
658 struct delta_entry *d = sorted_by_pos[i];
659 void *data;
660 unsigned long size;
661 enum object_type type;
662 int j, first, last;
663 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
665 continue;
666 data = read_sha1_file(d->base.sha1, &type, &size);
667 if (!data)
668 continue;
669 find_delta_children(&d->base, &first, &last);
671 for (j = first; j <= last; j++) {
672 struct object_entry *child = objects + deltas[j].obj_no;
673 if (child->real_type == OBJ_REF_DELTA)
674 resolve_delta(child, data, size, type);
675 }
676 if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
678 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
679 append_obj_to_pack(d->base.sha1, data, size, type);
680 free(data);
681 display_progress(progress, nr_resolved_deltas);
682 }
683 free(sorted_by_pos);
684}
685static void final(const char *final_pack_name, const char *curr_pack_name,
687 const char *final_index_name, const char *curr_index_name,
688 const char *keep_name, const char *keep_msg,
689 unsigned char *sha1)
690{
691 const char *report = "pack";
692 char name[PATH_MAX];
693 int err;
694 if (!from_stdin) {
696 close(input_fd);
697 } else {
698 fsync_or_die(output_fd, curr_pack_name);
699 err = close(output_fd);
700 if (err)
701 die("error while closing pack file: %s", strerror(errno));
702 chmod(curr_pack_name, 0444);
703 }
704 if (keep_msg) {
706 int keep_fd, keep_msg_len = strlen(keep_msg);
707 if (!keep_name) {
708 snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
709 get_object_directory(), sha1_to_hex(sha1));
710 keep_name = name;
711 }
712 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
713 if (keep_fd < 0) {
714 if (errno != EEXIST)
715 die("cannot write keep file");
716 } else {
717 if (keep_msg_len > 0) {
718 write_or_die(keep_fd, keep_msg, keep_msg_len);
719 write_or_die(keep_fd, "\n", 1);
720 }
721 if (close(keep_fd) != 0)
722 die("cannot write keep file");
723 report = "keep";
724 }
725 }
726 if (final_pack_name != curr_pack_name) {
728 if (!final_pack_name) {
729 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
730 get_object_directory(), sha1_to_hex(sha1));
731 final_pack_name = name;
732 }
733 if (move_temp_to_file(curr_pack_name, final_pack_name))
734 die("cannot store pack file");
735 }
736 chmod(curr_index_name, 0444);
738 if (final_index_name != curr_index_name) {
739 if (!final_index_name) {
740 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
741 get_object_directory(), sha1_to_hex(sha1));
742 final_index_name = name;
743 }
744 if (move_temp_to_file(curr_index_name, final_index_name))
745 die("cannot store index file");
746 }
747 if (!from_stdin) {
749 printf("%s\n", sha1_to_hex(sha1));
750 } else {
751 char buf[48];
752 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
753 report, sha1_to_hex(sha1));
754 write_or_die(1, buf, len);
755 /*
757 * Let's just mimic git-unpack-objects here and write
758 * the last part of the input buffer to stdout.
759 */
760 while (input_len) {
761 err = xwrite(1, input_buffer + input_offset, input_len);
762 if (err <= 0)
763 break;
764 input_len -= err;
765 input_offset += err;
766 }
767 }
768}
769static int git_index_pack_config(const char *k, const char *v, void *cb)
771{
772 if (!strcmp(k, "pack.indexversion")) {
773 pack_idx_default_version = git_config_int(k, v);
774 if (pack_idx_default_version > 2)
775 die("bad pack.indexversion=%"PRIu32,
776 pack_idx_default_version);
777 return 0;
778 }
779 return git_default_config(k, v, cb);
780}
781int main(int argc, char **argv)
783{
784 int i, fix_thin_pack = 0;
785 char *curr_pack, *pack_name = NULL;
786 char *curr_index, *index_name = NULL;
787 const char *keep_name = NULL, *keep_msg = NULL;
788 char *index_name_buf = NULL, *keep_name_buf = NULL;
789 struct pack_idx_entry **idx_objects;
790 unsigned char sha1[20];
791 git_config(git_index_pack_config, NULL);
793 for (i = 1; i < argc; i++) {
795 char *arg = argv[i];
796 if (*arg == '-') {
798 if (!strcmp(arg, "--stdin")) {
799 from_stdin = 1;
800 } else if (!strcmp(arg, "--fix-thin")) {
801 fix_thin_pack = 1;
802 } else if (!strcmp(arg, "--strict")) {
803 strict = 1;
804 } else if (!strcmp(arg, "--keep")) {
805 keep_msg = "";
806 } else if (!prefixcmp(arg, "--keep=")) {
807 keep_msg = arg + 7;
808 } else if (!prefixcmp(arg, "--pack_header=")) {
809 struct pack_header *hdr;
810 char *c;
811 hdr = (struct pack_header *)input_buffer;
813 hdr->hdr_signature = htonl(PACK_SIGNATURE);
814 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
815 if (*c != ',')
816 die("bad %s", arg);
817 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
818 if (*c)
819 die("bad %s", arg);
820 input_len = sizeof(*hdr);
821 } else if (!strcmp(arg, "-v")) {
822 verbose = 1;
823 } else if (!strcmp(arg, "-o")) {
824 if (index_name || (i+1) >= argc)
825 usage(index_pack_usage);
826 index_name = argv[++i];
827 } else if (!prefixcmp(arg, "--index-version=")) {
828 char *c;
829 pack_idx_default_version = strtoul(arg + 16, &c, 10);
830 if (pack_idx_default_version > 2)
831 die("bad %s", arg);
832 if (*c == ',')
833 pack_idx_off32_limit = strtoul(c+1, &c, 0);
834 if (*c || pack_idx_off32_limit & 0x80000000)
835 die("bad %s", arg);
836 } else
837 usage(index_pack_usage);
838 continue;
839 }
840 if (pack_name)
842 usage(index_pack_usage);
843 pack_name = arg;
844 }
845 if (!pack_name && !from_stdin)
847 usage(index_pack_usage);
848 if (fix_thin_pack && !from_stdin)
849 die("--fix-thin cannot be used without --stdin");
850 if (!index_name && pack_name) {
851 int len = strlen(pack_name);
852 if (!has_extension(pack_name, ".pack"))
853 die("packfile name '%s' does not end with '.pack'",
854 pack_name);
855 index_name_buf = xmalloc(len);
856 memcpy(index_name_buf, pack_name, len - 5);
857 strcpy(index_name_buf + len - 5, ".idx");
858 index_name = index_name_buf;
859 }
860 if (keep_msg && !keep_name && pack_name) {
861 int len = strlen(pack_name);
862 if (!has_extension(pack_name, ".pack"))
863 die("packfile name '%s' does not end with '.pack'",
864 pack_name);
865 keep_name_buf = xmalloc(len);
866 memcpy(keep_name_buf, pack_name, len - 5);
867 strcpy(keep_name_buf + len - 5, ".keep");
868 keep_name = keep_name_buf;
869 }
870 curr_pack = open_pack_file(pack_name);
872 parse_pack_header();
873 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
874 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
875 parse_pack_objects(sha1);
876 if (nr_deltas == nr_resolved_deltas) {
877 stop_progress(&progress);
878 /* Flush remaining pack final 20-byte SHA1. */
879 flush();
880 } else {
881 if (fix_thin_pack) {
882 char msg[48];
883 int nr_unresolved = nr_deltas - nr_resolved_deltas;
884 int nr_objects_initial = nr_objects;
885 if (nr_unresolved <= 0)
886 die("confusion beyond insanity");
887 objects = xrealloc(objects,
888 (nr_objects + nr_unresolved + 1)
889 * sizeof(*objects));
890 fix_unresolved_deltas(nr_unresolved);
891 sprintf(msg, "completed with %d local objects",
892 nr_objects - nr_objects_initial);
893 stop_progress_msg(&progress, msg);
894 fixup_pack_header_footer(output_fd, sha1,
895 curr_pack, nr_objects);
896 }
897 if (nr_deltas != nr_resolved_deltas)
898 die("pack has %d unresolved deltas",
899 nr_deltas - nr_resolved_deltas);
900 }
901 free(deltas);
902 if (strict)
903 check_objects();
904 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
906 for (i = 0; i < nr_objects; i++)
907 idx_objects[i] = &objects[i].idx;
908 curr_index = write_idx_file(index_name, idx_objects, nr_objects, sha1);
909 free(idx_objects);
910 final(pack_name, curr_pack,
912 index_name, curr_index,
913 keep_name, keep_msg,
914 sha1);
915 free(objects);
916 free(index_name_buf);
917 free(keep_name_buf);
918 if (pack_name == NULL)
919 free(curr_pack);
920 if (index_name == NULL)
921 free(curr_index);
922 return 0;
924}