c359f8c9dfda90344277a0c4f0cc8098d6936f3e
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};
28struct 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/*
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#define FLAG_LINK (1u<<20)
44#define FLAG_CHECKED (1u<<21)
45struct delta_entry
47{
48 union delta_base base;
49 int obj_no;
50};
51static struct object_entry *objects;
53static struct delta_entry *deltas;
54static struct base_data *base_cache;
55static size_t base_cache_used;
56static int nr_objects;
57static int nr_deltas;
58static int nr_resolved_deltas;
59static int from_stdin;
61static int strict;
62static int verbose;
63static struct progress *progress;
65/* We always read in 4kB chunks. */
67static unsigned char input_buffer[4096];
68static unsigned int input_offset, input_len;
69static off_t consumed_bytes;
70static SHA_CTX input_ctx;
71static uint32_t input_crc32;
72static int input_fd, output_fd, pack_fd;
73static int mark_link(struct object *obj, int type, void *data)
75{
76 if (!obj)
77 return -1;
78 if (type != OBJ_ANY && obj->type != type)
80 die("object type mismatch at %s", sha1_to_hex(obj->sha1));
81 obj->flags |= FLAG_LINK;
83 return 0;
84}
85/* The content of each linked object must have been checked
87 or it must be already present in the object database */
88static void check_object(struct object *obj)
89{
90 if (!obj)
91 return;
92 if (!(obj->flags & FLAG_LINK))
94 return;
95 if (!(obj->flags & FLAG_CHECKED)) {
97 unsigned long size;
98 int type = sha1_object_info(obj->sha1, &size);
99 if (type != obj->type || type <= 0)
100 die("object of unexpected type");
101 obj->flags |= FLAG_CHECKED;
102 return;
103 }
104}
105static void check_objects(void)
107{
108 unsigned i, max;
109 max = get_max_object_index();
111 for (i = 0; i < max; i++)
112 check_object(get_indexed_object(i));
113}
114/* Discard current buffer used content. */
117static void flush(void)
118{
119 if (input_offset) {
120 if (output_fd >= 0)
121 write_or_die(output_fd, input_buffer, input_offset);
122 SHA1_Update(&input_ctx, input_buffer, input_offset);
123 memmove(input_buffer, input_buffer + input_offset, input_len);
124 input_offset = 0;
125 }
126}
127/*
129 * Make sure at least "min" bytes are available in the buffer, and
130 * return the pointer to the buffer.
131 */
132static void *fill(int min)
133{
134 if (min <= input_len)
135 return input_buffer + input_offset;
136 if (min > sizeof(input_buffer))
137 die("cannot fill %d bytes", min);
138 flush();
139 do {
140 ssize_t ret = xread(input_fd, input_buffer + input_len,
141 sizeof(input_buffer) - input_len);
142 if (ret <= 0) {
143 if (!ret)
144 die("early EOF");
145 die("read error on input: %s", strerror(errno));
146 }
147 input_len += ret;
148 if (from_stdin)
149 display_throughput(progress, consumed_bytes + input_len);
150 } while (input_len < min);
151 return input_buffer;
152}
153static void use(int bytes)
155{
156 if (bytes > input_len)
157 die("used more bytes than were available");
158 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
159 input_len -= bytes;
160 input_offset += bytes;
161 /* make sure off_t is sufficiently large not to wrap */
163 if (consumed_bytes > consumed_bytes + bytes)
164 die("pack too large for current definition of off_t");
165 consumed_bytes += bytes;
166}
167static char *open_pack_file(char *pack_name)
169{
170 if (from_stdin) {
171 input_fd = 0;
172 if (!pack_name) {
173 static char tmpfile[PATH_MAX];
174 snprintf(tmpfile, sizeof(tmpfile),
175 "%s/tmp_pack_XXXXXX", get_object_directory());
176 output_fd = xmkstemp(tmpfile);
177 pack_name = xstrdup(tmpfile);
178 } else
179 output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
180 if (output_fd < 0)
181 die("unable to create %s: %s\n", pack_name, strerror(errno));
182 pack_fd = output_fd;
183 } else {
184 input_fd = open(pack_name, O_RDONLY);
185 if (input_fd < 0)
186 die("cannot open packfile '%s': %s",
187 pack_name, strerror(errno));
188 output_fd = -1;
189 pack_fd = input_fd;
190 }
191 SHA1_Init(&input_ctx);
192 return pack_name;
193}
194static void parse_pack_header(void)
196{
197 struct pack_header *hdr = fill(sizeof(struct pack_header));
198 /* Header consistency check */
200 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
201 die("pack signature mismatch");
202 if (!pack_version_ok(hdr->hdr_version))
203 die("pack version %d unsupported", ntohl(hdr->hdr_version));
204 nr_objects = ntohl(hdr->hdr_entries);
206 use(sizeof(struct pack_header));
207}
208static void bad_object(unsigned long offset, const char *format,
210 ...) NORETURN __attribute__((format (printf, 2, 3)));
211static void bad_object(unsigned long offset, const char *format, ...)
213{
214 va_list params;
215 char buf[1024];
216 va_start(params, format);
218 vsnprintf(buf, sizeof(buf), format, params);
219 va_end(params);
220 die("pack has bad object at offset %lu: %s", offset, buf);
221}
222static void prune_base_data(struct base_data *retain)
224{
225 struct base_data *b = base_cache;
226 for (b = base_cache;
227 base_cache_used > delta_base_cache_limit && b;
228 b = b->child) {
229 if (b->data && b != retain) {
230 free(b->data);
231 b->data = NULL;
232 base_cache_used -= b->size;
233 }
234 }
235}
236static void link_base_data(struct base_data *base, struct base_data *c)
238{
239 if (base)
240 base->child = c;
241 else
242 base_cache = c;
243 c->base = base;
245 c->child = NULL;
246 base_cache_used += c->size;
247 prune_base_data(c);
248}
249static void unlink_base_data(struct base_data *c)
251{
252 struct base_data *base = c->base;
253 if (base)
254 base->child = NULL;
255 else
256 base_cache = NULL;
257 if (c->data) {
258 free(c->data);
259 base_cache_used -= c->size;
260 }
261}
262static void *unpack_entry_data(unsigned long offset, unsigned long size)
264{
265 z_stream stream;
266 void *buf = xmalloc(size);
267 memset(&stream, 0, sizeof(stream));
269 stream.next_out = buf;
270 stream.avail_out = size;
271 stream.next_in = fill(1);
272 stream.avail_in = input_len;
273 inflateInit(&stream);
274 for (;;) {
276 int ret = inflate(&stream, 0);
277 use(input_len - stream.avail_in);
278 if (stream.total_out == size && ret == Z_STREAM_END)
279 break;
280 if (ret != Z_OK)
281 bad_object(offset, "inflate returned %d", ret);
282 stream.next_in = fill(1);
283 stream.avail_in = input_len;
284 }
285 inflateEnd(&stream);
286 return buf;
287}
288static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
290{
291 unsigned char *p, c;
292 unsigned long size;
293 off_t base_offset;
294 unsigned shift;
295 void *data;
296 obj->idx.offset = consumed_bytes;
298 input_crc32 = crc32(0, Z_NULL, 0);
299 p = fill(1);
301 c = *p;
302 use(1);
303 obj->type = (c >> 4) & 7;
304 size = (c & 15);
305 shift = 4;
306 while (c & 0x80) {
307 p = fill(1);
308 c = *p;
309 use(1);
310 size += (c & 0x7fUL) << shift;
311 shift += 7;
312 }
313 obj->size = size;
314 switch (obj->type) {
316 case OBJ_REF_DELTA:
317 hashcpy(delta_base->sha1, fill(20));
318 use(20);
319 break;
320 case OBJ_OFS_DELTA:
321 memset(delta_base, 0, sizeof(*delta_base));
322 p = fill(1);
323 c = *p;
324 use(1);
325 base_offset = c & 127;
326 while (c & 128) {
327 base_offset += 1;
328 if (!base_offset || MSB(base_offset, 7))
329 bad_object(obj->idx.offset, "offset value overflow for delta base object");
330 p = fill(1);
331 c = *p;
332 use(1);
333 base_offset = (base_offset << 7) + (c & 127);
334 }
335 delta_base->offset = obj->idx.offset - base_offset;
336 if (delta_base->offset >= obj->idx.offset)
337 bad_object(obj->idx.offset, "delta base offset is out of bound");
338 break;
339 case OBJ_COMMIT:
340 case OBJ_TREE:
341 case OBJ_BLOB:
342 case OBJ_TAG:
343 break;
344 default:
345 bad_object(obj->idx.offset, "unknown object type %d", obj->type);
346 }
347 obj->hdr_size = consumed_bytes - obj->idx.offset;
348 data = unpack_entry_data(obj->idx.offset, obj->size);
350 obj->idx.crc32 = input_crc32;
351 return data;
352}
353static void *get_data_from_pack(struct object_entry *obj)
355{
356 off_t from = obj[0].idx.offset + obj[0].hdr_size;
357 unsigned long len = obj[1].idx.offset - from;
358 unsigned long rdy = 0;
359 unsigned char *src, *data;
360 z_stream stream;
361 int st;
362 src = xmalloc(len);
364 data = src;
365 do {
366 ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
367 if (n <= 0)
368 die("cannot pread pack file: %s", strerror(errno));
369 rdy += n;
370 } while (rdy < len);
371 data = xmalloc(obj->size);
372 memset(&stream, 0, sizeof(stream));
373 stream.next_out = data;
374 stream.avail_out = obj->size;
375 stream.next_in = src;
376 stream.avail_in = len;
377 inflateInit(&stream);
378 while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
379 inflateEnd(&stream);
380 if (st != Z_STREAM_END || stream.total_out != obj->size)
381 die("serious inflate inconsistency");
382 free(src);
383 return data;
384}
385static int find_delta(const union delta_base *base)
387{
388 int first = 0, last = nr_deltas;
389 while (first < last) {
391 int next = (first + last) / 2;
392 struct delta_entry *delta = &deltas[next];
393 int cmp;
394 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
396 if (!cmp)
397 return next;
398 if (cmp < 0) {
399 last = next;
400 continue;
401 }
402 first = next+1;
403 }
404 return -first-1;
405}
406static int find_delta_children(const union delta_base *base,
408 int *first_index, int *last_index)
409{
410 int first = find_delta(base);
411 int last = first;
412 int end = nr_deltas - 1;
413 if (first < 0)
415 return -1;
416 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
417 --first;
418 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
419 ++last;
420 *first_index = first;
421 *last_index = last;
422 return 0;
423}
424static void sha1_object(const void *data, unsigned long size,
426 enum object_type type, unsigned char *sha1)
427{
428 hash_sha1_file(data, size, typename(type), sha1);
429 if (has_sha1_file(sha1)) {
430 void *has_data;
431 enum object_type has_type;
432 unsigned long has_size;
433 has_data = read_sha1_file(sha1, &has_type, &has_size);
434 if (!has_data)
435 die("cannot read existing object %s", sha1_to_hex(sha1));
436 if (size != has_size || type != has_type ||
437 memcmp(data, has_data, size) != 0)
438 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
439 free(has_data);
440 }
441 if (strict) {
442 if (type == OBJ_BLOB) {
443 struct blob *blob = lookup_blob(sha1);
444 if (blob)
445 blob->object.flags |= FLAG_CHECKED;
446 else
447 die("invalid blob object %s", sha1_to_hex(sha1));
448 } else {
449 struct object *obj;
450 int eaten;
451 void *buf = (void *) data;
452 /*
454 * we do not need to free the memory here, as the
455 * buf is deleted by the caller.
456 */
457 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
458 if (!obj)
459 die("invalid %s", typename(type));
460 if (fsck_object(obj, 1, fsck_error_function))
461 die("Error in object");
462 if (fsck_walk(obj, mark_link, 0))
463 die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
464 if (obj->type == OBJ_TREE) {
466 struct tree *item = (struct tree *) obj;
467 item->buffer = NULL;
468 }
469 if (obj->type == OBJ_COMMIT) {
470 struct commit *commit = (struct commit *) obj;
471 commit->buffer = NULL;
472 }
473 obj->flags |= FLAG_CHECKED;
474 }
475 }
476}
477static void *get_base_data(struct base_data *c)
479{
480 if (!c->data) {
481 struct object_entry *obj = c->obj;
482 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
484 void *base = get_base_data(c->base);
485 void *raw = get_data_from_pack(obj);
486 c->data = patch_delta(
487 base, c->base->size,
488 raw, obj->size,
489 &c->size);
490 free(raw);
491 if (!c->data)
492 bad_object(obj->idx.offset, "failed to apply delta");
493 } else
494 c->data = get_data_from_pack(obj);
495 base_cache_used += c->size;
497 prune_base_data(c);
498 }
499 return c->data;
500}
501static void resolve_delta(struct object_entry *delta_obj,
503 struct base_data *base_obj, enum object_type type)
504{
505 void *delta_data;
506 unsigned long delta_size;
507 union delta_base delta_base;
508 int j, first, last;
509 struct base_data result;
510 delta_obj->real_type = type;
512 delta_data = get_data_from_pack(delta_obj);
513 delta_size = delta_obj->size;
514 result.data = patch_delta(get_base_data(base_obj), base_obj->size,
515 delta_data, delta_size,
516 &result.size);
517 free(delta_data);
518 if (!result.data)
519 bad_object(delta_obj->idx.offset, "failed to apply delta");
520 sha1_object(result.data, result.size, type, delta_obj->idx.sha1);
521 nr_resolved_deltas++;
522 result.obj = delta_obj;
524 link_base_data(base_obj, &result);
525 hashcpy(delta_base.sha1, delta_obj->idx.sha1);
527 if (!find_delta_children(&delta_base, &first, &last)) {
528 for (j = first; j <= last; j++) {
529 struct object_entry *child = objects + deltas[j].obj_no;
530 if (child->real_type == OBJ_REF_DELTA)
531 resolve_delta(child, &result, type);
532 }
533 }
534 memset(&delta_base, 0, sizeof(delta_base));
536 delta_base.offset = delta_obj->idx.offset;
537 if (!find_delta_children(&delta_base, &first, &last)) {
538 for (j = first; j <= last; j++) {
539 struct object_entry *child = objects + deltas[j].obj_no;
540 if (child->real_type == OBJ_OFS_DELTA)
541 resolve_delta(child, &result, type);
542 }
543 }
544 unlink_base_data(&result);
546}
547static int compare_delta_entry(const void *a, const void *b)
549{
550 const struct delta_entry *delta_a = a;
551 const struct delta_entry *delta_b = b;
552 return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
553}
554/* Parse all objects and return the pack content SHA1 hash */
556static void parse_pack_objects(unsigned char *sha1)
557{
558 int i;
559 struct delta_entry *delta = deltas;
560 struct stat st;
561 /*
563 * First pass:
564 * - find locations of all objects;
565 * - calculate SHA1 of all non-delta objects;
566 * - remember base (SHA1 or offset) for all deltas.
567 */
568 if (verbose)
569 progress = start_progress(
570 from_stdin ? "Receiving objects" : "Indexing objects",
571 nr_objects);
572 for (i = 0; i < nr_objects; i++) {
573 struct object_entry *obj = &objects[i];
574 void *data = unpack_raw_entry(obj, &delta->base);
575 obj->real_type = obj->type;
576 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
577 nr_deltas++;
578 delta->obj_no = i;
579 delta++;
580 } else
581 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
582 free(data);
583 display_progress(progress, i+1);
584 }
585 objects[i].idx.offset = consumed_bytes;
586 stop_progress(&progress);
587 /* Check pack integrity */
589 flush();
590 SHA1_Final(sha1, &input_ctx);
591 if (hashcmp(fill(20), sha1))
592 die("pack is corrupted (SHA1 mismatch)");
593 use(20);
594 /* If input_fd is a file, we should have reached its end now. */
596 if (fstat(input_fd, &st))
597 die("cannot fstat packfile: %s", strerror(errno));
598 if (S_ISREG(st.st_mode) &&
599 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
600 die("pack has junk at the end");
601 if (!nr_deltas)
603 return;
604 /* Sort deltas by base SHA1/offset for fast searching */
606 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
607 compare_delta_entry);
608 /*
610 * Second pass:
611 * - for all non-delta objects, look if it is used as a base for
612 * deltas;
613 * - if used as a base, uncompress the object and apply all deltas,
614 * recursively checking if the resulting object is used as a base
615 * for some more deltas.
616 */
617 if (verbose)
618 progress = start_progress("Resolving deltas", nr_deltas);
619 for (i = 0; i < nr_objects; i++) {
620 struct object_entry *obj = &objects[i];
621 union delta_base base;
622 int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
623 struct base_data base_obj;
624 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
626 continue;
627 hashcpy(base.sha1, obj->idx.sha1);
628 ref = !find_delta_children(&base, &ref_first, &ref_last);
629 memset(&base, 0, sizeof(base));
630 base.offset = obj->idx.offset;
631 ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
632 if (!ref && !ofs)
633 continue;
634 base_obj.data = get_data_from_pack(obj);
635 base_obj.size = obj->size;
636 base_obj.obj = obj;
637 link_base_data(NULL, &base_obj);
638 if (ref)
640 for (j = ref_first; j <= ref_last; j++) {
641 struct object_entry *child = objects + deltas[j].obj_no;
642 if (child->real_type == OBJ_REF_DELTA)
643 resolve_delta(child, &base_obj, obj->type);
644 }
645 if (ofs)
646 for (j = ofs_first; j <= ofs_last; j++) {
647 struct object_entry *child = objects + deltas[j].obj_no;
648 if (child->real_type == OBJ_OFS_DELTA)
649 resolve_delta(child, &base_obj, obj->type);
650 }
651 unlink_base_data(&base_obj);
652 display_progress(progress, nr_resolved_deltas);
653 }
654}
655static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
657{
658 z_stream stream;
659 unsigned long maxsize;
660 void *out;
661 memset(&stream, 0, sizeof(stream));
663 deflateInit(&stream, zlib_compression_level);
664 maxsize = deflateBound(&stream, size);
665 out = xmalloc(maxsize);
666 /* Compress it */
668 stream.next_in = in;
669 stream.avail_in = size;
670 stream.next_out = out;
671 stream.avail_out = maxsize;
672 while (deflate(&stream, Z_FINISH) == Z_OK);
673 deflateEnd(&stream);
674 size = stream.total_out;
676 write_or_die(fd, out, size);
677 *obj_crc = crc32(*obj_crc, out, size);
678 free(out);
679 return size;
680}
681static struct object_entry *append_obj_to_pack(
683 const unsigned char *sha1, void *buf,
684 unsigned long size, enum object_type type)
685{
686 struct object_entry *obj = &objects[nr_objects++];
687 unsigned char header[10];
688 unsigned long s = size;
689 int n = 0;
690 unsigned char c = (type << 4) | (s & 15);
691 s >>= 4;
692 while (s) {
693 header[n++] = c | 0x80;
694 c = s & 0x7f;
695 s >>= 7;
696 }
697 header[n++] = c;
698 write_or_die(output_fd, header, n);
699 obj[0].idx.crc32 = crc32(0, Z_NULL, 0);
700 obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n);
701 obj[1].idx.offset = obj[0].idx.offset + n;
702 obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
703 hashcpy(obj->idx.sha1, sha1);
704 return obj;
705}
706static int delta_pos_compare(const void *_a, const void *_b)
708{
709 struct delta_entry *a = *(struct delta_entry **)_a;
710 struct delta_entry *b = *(struct delta_entry **)_b;
711 return a->obj_no - b->obj_no;
712}
713static void fix_unresolved_deltas(int nr_unresolved)
715{
716 struct delta_entry **sorted_by_pos;
717 int i, n = 0;
718 /*
720 * Since many unresolved deltas may well be themselves base objects
721 * for more unresolved deltas, we really want to include the
722 * smallest number of base objects that would cover as much delta
723 * as possible by picking the
724 * trunc deltas first, allowing for other deltas to resolve without
725 * additional base objects. Since most base objects are to be found
726 * before deltas depending on them, a good heuristic is to start
727 * resolving deltas in the same order as their position in the pack.
728 */
729 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
730 for (i = 0; i < nr_deltas; i++) {
731 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
732 continue;
733 sorted_by_pos[n++] = &deltas[i];
734 }
735 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
736 for (i = 0; i < n; i++) {
738 struct delta_entry *d = sorted_by_pos[i];
739 enum object_type type;
740 int j, first, last;
741 struct base_data base_obj;
742 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
744 continue;
745 base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size);
746 if (!base_obj.data)
747 continue;
748 if (check_sha1_signature(d->base.sha1, base_obj.data,
750 base_obj.size, typename(type)))
751 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
752 base_obj.obj = append_obj_to_pack(d->base.sha1, base_obj.data,
753 base_obj.size, type);
754 link_base_data(NULL, &base_obj);
755 find_delta_children(&d->base, &first, &last);
757 for (j = first; j <= last; j++) {
758 struct object_entry *child = objects + deltas[j].obj_no;
759 if (child->real_type == OBJ_REF_DELTA)
760 resolve_delta(child, &base_obj, type);
761 }
762 unlink_base_data(&base_obj);
764 display_progress(progress, nr_resolved_deltas);
765 }
766 free(sorted_by_pos);
767}
768static void final(const char *final_pack_name, const char *curr_pack_name,
770 const char *final_index_name, const char *curr_index_name,
771 const char *keep_name, const char *keep_msg,
772 unsigned char *sha1)
773{
774 const char *report = "pack";
775 char name[PATH_MAX];
776 int err;
777 if (!from_stdin) {
779 close(input_fd);
780 } else {
781 fsync_or_die(output_fd, curr_pack_name);
782 err = close(output_fd);
783 if (err)
784 die("error while closing pack file: %s", strerror(errno));
785 chmod(curr_pack_name, 0444);
786 }
787 if (keep_msg) {
789 int keep_fd, keep_msg_len = strlen(keep_msg);
790 if (!keep_name) {
791 snprintf(name, sizeof(name), "%s/pack/pack-%s.keep",
792 get_object_directory(), sha1_to_hex(sha1));
793 keep_name = name;
794 }
795 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
796 if (keep_fd < 0) {
797 if (errno != EEXIST)
798 die("cannot write keep file");
799 } else {
800 if (keep_msg_len > 0) {
801 write_or_die(keep_fd, keep_msg, keep_msg_len);
802 write_or_die(keep_fd, "\n", 1);
803 }
804 if (close(keep_fd) != 0)
805 die("cannot write keep file");
806 report = "keep";
807 }
808 }
809 if (final_pack_name != curr_pack_name) {
811 if (!final_pack_name) {
812 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
813 get_object_directory(), sha1_to_hex(sha1));
814 final_pack_name = name;
815 }
816 if (move_temp_to_file(curr_pack_name, final_pack_name))
817 die("cannot store pack file");
818 }
819 chmod(curr_index_name, 0444);
821 if (final_index_name != curr_index_name) {
822 if (!final_index_name) {
823 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
824 get_object_directory(), sha1_to_hex(sha1));
825 final_index_name = name;
826 }
827 if (move_temp_to_file(curr_index_name, final_index_name))
828 die("cannot store index file");
829 }
830 if (!from_stdin) {
832 printf("%s\n", sha1_to_hex(sha1));
833 } else {
834 char buf[48];
835 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
836 report, sha1_to_hex(sha1));
837 write_or_die(1, buf, len);
838 /*
840 * Let's just mimic git-unpack-objects here and write
841 * the last part of the input buffer to stdout.
842 */
843 while (input_len) {
844 err = xwrite(1, input_buffer + input_offset, input_len);
845 if (err <= 0)
846 break;
847 input_len -= err;
848 input_offset += err;
849 }
850 }
851}
852static int git_index_pack_config(const char *k, const char *v, void *cb)
854{
855 if (!strcmp(k, "pack.indexversion")) {
856 pack_idx_default_version = git_config_int(k, v);
857 if (pack_idx_default_version > 2)
858 die("bad pack.indexversion=%d", pack_idx_default_version);
859 return 0;
860 }
861 return git_default_config(k, v, cb);
862}
863int main(int argc, char **argv)
865{
866 int i, fix_thin_pack = 0;
867 char *curr_pack, *pack_name = NULL;
868 char *curr_index, *index_name = NULL;
869 const char *keep_name = NULL, *keep_msg = NULL;
870 char *index_name_buf = NULL, *keep_name_buf = NULL;
871 struct pack_idx_entry **idx_objects;
872 unsigned char sha1[20];
873 git_config(git_index_pack_config, NULL);
875 for (i = 1; i < argc; i++) {
877 char *arg = argv[i];
878 if (*arg == '-') {
880 if (!strcmp(arg, "--stdin")) {
881 from_stdin = 1;
882 } else if (!strcmp(arg, "--fix-thin")) {
883 fix_thin_pack = 1;
884 } else if (!strcmp(arg, "--strict")) {
885 strict = 1;
886 } else if (!strcmp(arg, "--keep")) {
887 keep_msg = "";
888 } else if (!prefixcmp(arg, "--keep=")) {
889 keep_msg = arg + 7;
890 } else if (!prefixcmp(arg, "--pack_header=")) {
891 struct pack_header *hdr;
892 char *c;
893 hdr = (struct pack_header *)input_buffer;
895 hdr->hdr_signature = htonl(PACK_SIGNATURE);
896 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
897 if (*c != ',')
898 die("bad %s", arg);
899 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
900 if (*c)
901 die("bad %s", arg);
902 input_len = sizeof(*hdr);
903 } else if (!strcmp(arg, "-v")) {
904 verbose = 1;
905 } else if (!strcmp(arg, "-o")) {
906 if (index_name || (i+1) >= argc)
907 usage(index_pack_usage);
908 index_name = argv[++i];
909 } else if (!prefixcmp(arg, "--index-version=")) {
910 char *c;
911 pack_idx_default_version = strtoul(arg + 16, &c, 10);
912 if (pack_idx_default_version > 2)
913 die("bad %s", arg);
914 if (*c == ',')
915 pack_idx_off32_limit = strtoul(c+1, &c, 0);
916 if (*c || pack_idx_off32_limit & 0x80000000)
917 die("bad %s", arg);
918 } else
919 usage(index_pack_usage);
920 continue;
921 }
922 if (pack_name)
924 usage(index_pack_usage);
925 pack_name = arg;
926 }
927 if (!pack_name && !from_stdin)
929 usage(index_pack_usage);
930 if (fix_thin_pack && !from_stdin)
931 die("--fix-thin cannot be used without --stdin");
932 if (!index_name && pack_name) {
933 int len = strlen(pack_name);
934 if (!has_extension(pack_name, ".pack"))
935 die("packfile name '%s' does not end with '.pack'",
936 pack_name);
937 index_name_buf = xmalloc(len);
938 memcpy(index_name_buf, pack_name, len - 5);
939 strcpy(index_name_buf + len - 5, ".idx");
940 index_name = index_name_buf;
941 }
942 if (keep_msg && !keep_name && pack_name) {
943 int len = strlen(pack_name);
944 if (!has_extension(pack_name, ".pack"))
945 die("packfile name '%s' does not end with '.pack'",
946 pack_name);
947 keep_name_buf = xmalloc(len);
948 memcpy(keep_name_buf, pack_name, len - 5);
949 strcpy(keep_name_buf + len - 5, ".keep");
950 keep_name = keep_name_buf;
951 }
952 curr_pack = open_pack_file(pack_name);
954 parse_pack_header();
955 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
956 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
957 parse_pack_objects(sha1);
958 if (nr_deltas == nr_resolved_deltas) {
959 stop_progress(&progress);
960 /* Flush remaining pack final 20-byte SHA1. */
961 flush();
962 } else {
963 if (fix_thin_pack) {
964 char msg[48];
965 int nr_unresolved = nr_deltas - nr_resolved_deltas;
966 int nr_objects_initial = nr_objects;
967 if (nr_unresolved <= 0)
968 die("confusion beyond insanity");
969 objects = xrealloc(objects,
970 (nr_objects + nr_unresolved + 1)
971 * sizeof(*objects));
972 fix_unresolved_deltas(nr_unresolved);
973 sprintf(msg, "completed with %d local objects",
974 nr_objects - nr_objects_initial);
975 stop_progress_msg(&progress, msg);
976 fixup_pack_header_footer(output_fd, sha1,
977 curr_pack, nr_objects);
978 }
979 if (nr_deltas != nr_resolved_deltas)
980 die("pack has %d unresolved deltas",
981 nr_deltas - nr_resolved_deltas);
982 }
983 free(deltas);
984 if (strict)
985 check_objects();
986 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
988 for (i = 0; i < nr_objects; i++)
989 idx_objects[i] = &objects[i].idx;
990 curr_index = write_idx_file(index_name, idx_objects, nr_objects, sha1);
991 free(idx_objects);
992 final(pack_name, curr_pack,
994 index_name, curr_index,
995 keep_name, keep_msg,
996 sha1);
997 free(objects);
998 free(index_name_buf);
999 free(keep_name_buf);
1000 if (pack_name == NULL)
1001 free(curr_pack);
1002 if (index_name == NULL)
1003 free(curr_index);
1004 return 0;
1006}