Code

nicer display of thin pack completion
[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"
11 static const char index_pack_usage[] =
12 "git-index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
14 struct 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 };
23 union delta_base {
24         unsigned char sha1[20];
25         off_t offset;
26 };
28 /*
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
34 struct delta_entry
35 {
36         union delta_base base;
37         int obj_no;
38 };
40 static struct object_entry *objects;
41 static struct delta_entry *deltas;
42 static int nr_objects;
43 static int nr_deltas;
44 static int nr_resolved_deltas;
46 static int from_stdin;
47 static int verbose;
49 static struct progress *progress;
51 /* We always read in 4kB chunks. */
52 static unsigned char input_buffer[4096];
53 static unsigned int input_offset, input_len;
54 static off_t consumed_bytes;
55 static SHA_CTX input_ctx;
56 static uint32_t input_crc32;
57 static int input_fd, output_fd, pack_fd;
59 /* Discard current buffer used content. */
60 static 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 }
71 /*
72  * Make sure at least "min" bytes are available in the buffer, and
73  * return the pointer to the buffer.
74  */
75 static 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                 if (from_stdin)
92                         display_throughput(progress, consumed_bytes + input_len);
93         } while (input_len < min);
94         return input_buffer;
95 }
97 static void use(int bytes)
98 {
99         if (bytes > input_len)
100                 die("used more bytes than were available");
101         input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
102         input_len -= bytes;
103         input_offset += bytes;
105         /* make sure off_t is sufficiently large not to wrap */
106         if (consumed_bytes > consumed_bytes + bytes)
107                 die("pack too large for current definition of off_t");
108         consumed_bytes += bytes;
111 static char *open_pack_file(char *pack_name)
113         if (from_stdin) {
114                 input_fd = 0;
115                 if (!pack_name) {
116                         static char tmpfile[PATH_MAX];
117                         snprintf(tmpfile, sizeof(tmpfile),
118                                  "%s/tmp_pack_XXXXXX", get_object_directory());
119                         output_fd = xmkstemp(tmpfile);
120                         pack_name = xstrdup(tmpfile);
121                 } else
122                         output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
123                 if (output_fd < 0)
124                         die("unable to create %s: %s\n", pack_name, strerror(errno));
125                 pack_fd = output_fd;
126         } else {
127                 input_fd = open(pack_name, O_RDONLY);
128                 if (input_fd < 0)
129                         die("cannot open packfile '%s': %s",
130                             pack_name, strerror(errno));
131                 output_fd = -1;
132                 pack_fd = input_fd;
133         }
134         SHA1_Init(&input_ctx);
135         return pack_name;
138 static void parse_pack_header(void)
140         struct pack_header *hdr = fill(sizeof(struct pack_header));
142         /* Header consistency check */
143         if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
144                 die("pack signature mismatch");
145         if (!pack_version_ok(hdr->hdr_version))
146                 die("pack version %d unsupported", ntohl(hdr->hdr_version));
148         nr_objects = ntohl(hdr->hdr_entries);
149         use(sizeof(struct pack_header));
152 static void bad_object(unsigned long offset, const char *format,
153                        ...) NORETURN __attribute__((format (printf, 2, 3)));
155 static void bad_object(unsigned long offset, const char *format, ...)
157         va_list params;
158         char buf[1024];
160         va_start(params, format);
161         vsnprintf(buf, sizeof(buf), format, params);
162         va_end(params);
163         die("pack has bad object at offset %lu: %s", offset, buf);
166 static void *unpack_entry_data(unsigned long offset, unsigned long size)
168         z_stream stream;
169         void *buf = xmalloc(size);
171         memset(&stream, 0, sizeof(stream));
172         stream.next_out = buf;
173         stream.avail_out = size;
174         stream.next_in = fill(1);
175         stream.avail_in = input_len;
176         inflateInit(&stream);
178         for (;;) {
179                 int ret = inflate(&stream, 0);
180                 use(input_len - stream.avail_in);
181                 if (stream.total_out == size && ret == Z_STREAM_END)
182                         break;
183                 if (ret != Z_OK)
184                         bad_object(offset, "inflate returned %d", ret);
185                 stream.next_in = fill(1);
186                 stream.avail_in = input_len;
187         }
188         inflateEnd(&stream);
189         return buf;
192 static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
194         unsigned char *p, c;
195         unsigned long size;
196         off_t base_offset;
197         unsigned shift;
198         void *data;
200         obj->idx.offset = consumed_bytes;
201         input_crc32 = crc32(0, Z_NULL, 0);
203         p = fill(1);
204         c = *p;
205         use(1);
206         obj->type = (c >> 4) & 7;
207         size = (c & 15);
208         shift = 4;
209         while (c & 0x80) {
210                 p = fill(1);
211                 c = *p;
212                 use(1);
213                 size += (c & 0x7fUL) << shift;
214                 shift += 7;
215         }
216         obj->size = size;
218         switch (obj->type) {
219         case OBJ_REF_DELTA:
220                 hashcpy(delta_base->sha1, fill(20));
221                 use(20);
222                 break;
223         case OBJ_OFS_DELTA:
224                 memset(delta_base, 0, sizeof(*delta_base));
225                 p = fill(1);
226                 c = *p;
227                 use(1);
228                 base_offset = c & 127;
229                 while (c & 128) {
230                         base_offset += 1;
231                         if (!base_offset || MSB(base_offset, 7))
232                                 bad_object(obj->idx.offset, "offset value overflow for delta base object");
233                         p = fill(1);
234                         c = *p;
235                         use(1);
236                         base_offset = (base_offset << 7) + (c & 127);
237                 }
238                 delta_base->offset = obj->idx.offset - base_offset;
239                 if (delta_base->offset >= obj->idx.offset)
240                         bad_object(obj->idx.offset, "delta base offset is out of bound");
241                 break;
242         case OBJ_COMMIT:
243         case OBJ_TREE:
244         case OBJ_BLOB:
245         case OBJ_TAG:
246                 break;
247         default:
248                 bad_object(obj->idx.offset, "unknown object type %d", obj->type);
249         }
250         obj->hdr_size = consumed_bytes - obj->idx.offset;
252         data = unpack_entry_data(obj->idx.offset, obj->size);
253         obj->idx.crc32 = input_crc32;
254         return data;
257 static void *get_data_from_pack(struct object_entry *obj)
259         unsigned long from = obj[0].idx.offset + obj[0].hdr_size;
260         unsigned long len = obj[1].idx.offset - from;
261         unsigned long rdy = 0;
262         unsigned char *src, *data;
263         z_stream stream;
264         int st;
266         src = xmalloc(len);
267         data = src;
268         do {
269                 ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
270                 if (n <= 0)
271                         die("cannot pread pack file: %s", strerror(errno));
272                 rdy += n;
273         } while (rdy < len);
274         data = xmalloc(obj->size);
275         memset(&stream, 0, sizeof(stream));
276         stream.next_out = data;
277         stream.avail_out = obj->size;
278         stream.next_in = src;
279         stream.avail_in = len;
280         inflateInit(&stream);
281         while ((st = inflate(&stream, Z_FINISH)) == Z_OK);
282         inflateEnd(&stream);
283         if (st != Z_STREAM_END || stream.total_out != obj->size)
284                 die("serious inflate inconsistency");
285         free(src);
286         return data;
289 static int find_delta(const union delta_base *base)
291         int first = 0, last = nr_deltas;
293         while (first < last) {
294                 int next = (first + last) / 2;
295                 struct delta_entry *delta = &deltas[next];
296                 int cmp;
298                 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
299                 if (!cmp)
300                         return next;
301                 if (cmp < 0) {
302                         last = next;
303                         continue;
304                 }
305                 first = next+1;
306         }
307         return -first-1;
310 static int find_delta_children(const union delta_base *base,
311                                int *first_index, int *last_index)
313         int first = find_delta(base);
314         int last = first;
315         int end = nr_deltas - 1;
317         if (first < 0)
318                 return -1;
319         while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
320                 --first;
321         while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
322                 ++last;
323         *first_index = first;
324         *last_index = last;
325         return 0;
328 static void sha1_object(const void *data, unsigned long size,
329                         enum object_type type, unsigned char *sha1)
331         hash_sha1_file(data, size, typename(type), sha1);
332         if (has_sha1_file(sha1)) {
333                 void *has_data;
334                 enum object_type has_type;
335                 unsigned long has_size;
336                 has_data = read_sha1_file(sha1, &has_type, &has_size);
337                 if (!has_data)
338                         die("cannot read existing object %s", sha1_to_hex(sha1));
339                 if (size != has_size || type != has_type ||
340                     memcmp(data, has_data, size) != 0)
341                         die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
342                 free(has_data);
343         }
346 static void resolve_delta(struct object_entry *delta_obj, void *base_data,
347                           unsigned long base_size, enum object_type type)
349         void *delta_data;
350         unsigned long delta_size;
351         void *result;
352         unsigned long result_size;
353         union delta_base delta_base;
354         int j, first, last;
356         delta_obj->real_type = type;
357         delta_data = get_data_from_pack(delta_obj);
358         delta_size = delta_obj->size;
359         result = patch_delta(base_data, base_size, delta_data, delta_size,
360                              &result_size);
361         free(delta_data);
362         if (!result)
363                 bad_object(delta_obj->idx.offset, "failed to apply delta");
364         sha1_object(result, result_size, type, delta_obj->idx.sha1);
365         nr_resolved_deltas++;
367         hashcpy(delta_base.sha1, delta_obj->idx.sha1);
368         if (!find_delta_children(&delta_base, &first, &last)) {
369                 for (j = first; j <= last; j++) {
370                         struct object_entry *child = objects + deltas[j].obj_no;
371                         if (child->real_type == OBJ_REF_DELTA)
372                                 resolve_delta(child, result, result_size, type);
373                 }
374         }
376         memset(&delta_base, 0, sizeof(delta_base));
377         delta_base.offset = delta_obj->idx.offset;
378         if (!find_delta_children(&delta_base, &first, &last)) {
379                 for (j = first; j <= last; j++) {
380                         struct object_entry *child = objects + deltas[j].obj_no;
381                         if (child->real_type == OBJ_OFS_DELTA)
382                                 resolve_delta(child, result, result_size, type);
383                 }
384         }
386         free(result);
389 static int compare_delta_entry(const void *a, const void *b)
391         const struct delta_entry *delta_a = a;
392         const struct delta_entry *delta_b = b;
393         return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
396 /* Parse all objects and return the pack content SHA1 hash */
397 static void parse_pack_objects(unsigned char *sha1)
399         int i;
400         struct delta_entry *delta = deltas;
401         void *data;
402         struct stat st;
404         /*
405          * First pass:
406          * - find locations of all objects;
407          * - calculate SHA1 of all non-delta objects;
408          * - remember base (SHA1 or offset) for all deltas.
409          */
410         if (verbose)
411                 progress = start_progress(
412                                 from_stdin ? "Receiving objects" : "Indexing objects",
413                                 nr_objects);
414         for (i = 0; i < nr_objects; i++) {
415                 struct object_entry *obj = &objects[i];
416                 data = unpack_raw_entry(obj, &delta->base);
417                 obj->real_type = obj->type;
418                 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
419                         nr_deltas++;
420                         delta->obj_no = i;
421                         delta++;
422                 } else
423                         sha1_object(data, obj->size, obj->type, obj->idx.sha1);
424                 free(data);
425                 display_progress(progress, i+1);
426         }
427         objects[i].idx.offset = consumed_bytes;
428         stop_progress(&progress);
430         /* Check pack integrity */
431         flush();
432         SHA1_Final(sha1, &input_ctx);
433         if (hashcmp(fill(20), sha1))
434                 die("pack is corrupted (SHA1 mismatch)");
435         use(20);
437         /* If input_fd is a file, we should have reached its end now. */
438         if (fstat(input_fd, &st))
439                 die("cannot fstat packfile: %s", strerror(errno));
440         if (S_ISREG(st.st_mode) &&
441                         lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
442                 die("pack has junk at the end");
444         if (!nr_deltas)
445                 return;
447         /* Sort deltas by base SHA1/offset for fast searching */
448         qsort(deltas, nr_deltas, sizeof(struct delta_entry),
449               compare_delta_entry);
451         /*
452          * Second pass:
453          * - for all non-delta objects, look if it is used as a base for
454          *   deltas;
455          * - if used as a base, uncompress the object and apply all deltas,
456          *   recursively checking if the resulting object is used as a base
457          *   for some more deltas.
458          */
459         if (verbose)
460                 progress = start_progress("Resolving deltas", nr_deltas);
461         for (i = 0; i < nr_objects; i++) {
462                 struct object_entry *obj = &objects[i];
463                 union delta_base base;
464                 int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
466                 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
467                         continue;
468                 hashcpy(base.sha1, obj->idx.sha1);
469                 ref = !find_delta_children(&base, &ref_first, &ref_last);
470                 memset(&base, 0, sizeof(base));
471                 base.offset = obj->idx.offset;
472                 ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
473                 if (!ref && !ofs)
474                         continue;
475                 data = get_data_from_pack(obj);
476                 if (ref)
477                         for (j = ref_first; j <= ref_last; j++) {
478                                 struct object_entry *child = objects + deltas[j].obj_no;
479                                 if (child->real_type == OBJ_REF_DELTA)
480                                         resolve_delta(child, data,
481                                                       obj->size, obj->type);
482                         }
483                 if (ofs)
484                         for (j = ofs_first; j <= ofs_last; j++) {
485                                 struct object_entry *child = objects + deltas[j].obj_no;
486                                 if (child->real_type == OBJ_OFS_DELTA)
487                                         resolve_delta(child, data,
488                                                       obj->size, obj->type);
489                         }
490                 free(data);
491                 display_progress(progress, nr_resolved_deltas);
492         }
495 static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc)
497         z_stream stream;
498         unsigned long maxsize;
499         void *out;
501         memset(&stream, 0, sizeof(stream));
502         deflateInit(&stream, zlib_compression_level);
503         maxsize = deflateBound(&stream, size);
504         out = xmalloc(maxsize);
506         /* Compress it */
507         stream.next_in = in;
508         stream.avail_in = size;
509         stream.next_out = out;
510         stream.avail_out = maxsize;
511         while (deflate(&stream, Z_FINISH) == Z_OK);
512         deflateEnd(&stream);
514         size = stream.total_out;
515         write_or_die(fd, out, size);
516         *obj_crc = crc32(*obj_crc, out, size);
517         free(out);
518         return size;
521 static void append_obj_to_pack(const unsigned char *sha1, void *buf,
522                                unsigned long size, enum object_type type)
524         struct object_entry *obj = &objects[nr_objects++];
525         unsigned char header[10];
526         unsigned long s = size;
527         int n = 0;
528         unsigned char c = (type << 4) | (s & 15);
529         s >>= 4;
530         while (s) {
531                 header[n++] = c | 0x80;
532                 c = s & 0x7f;
533                 s >>= 7;
534         }
535         header[n++] = c;
536         write_or_die(output_fd, header, n);
537         obj[0].idx.crc32 = crc32(0, Z_NULL, 0);
538         obj[0].idx.crc32 = crc32(obj[0].idx.crc32, header, n);
539         obj[1].idx.offset = obj[0].idx.offset + n;
540         obj[1].idx.offset += write_compressed(output_fd, buf, size, &obj[0].idx.crc32);
541         hashcpy(obj->idx.sha1, sha1);
544 static int delta_pos_compare(const void *_a, const void *_b)
546         struct delta_entry *a = *(struct delta_entry **)_a;
547         struct delta_entry *b = *(struct delta_entry **)_b;
548         return a->obj_no - b->obj_no;
551 static void fix_unresolved_deltas(int nr_unresolved)
553         struct delta_entry **sorted_by_pos;
554         int i, n = 0;
556         /*
557          * Since many unresolved deltas may well be themselves base objects
558          * for more unresolved deltas, we really want to include the
559          * smallest number of base objects that would cover as much delta
560          * as possible by picking the
561          * trunc deltas first, allowing for other deltas to resolve without
562          * additional base objects.  Since most base objects are to be found
563          * before deltas depending on them, a good heuristic is to start
564          * resolving deltas in the same order as their position in the pack.
565          */
566         sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
567         for (i = 0; i < nr_deltas; i++) {
568                 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
569                         continue;
570                 sorted_by_pos[n++] = &deltas[i];
571         }
572         qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
574         for (i = 0; i < n; i++) {
575                 struct delta_entry *d = sorted_by_pos[i];
576                 void *data;
577                 unsigned long size;
578                 enum object_type type;
579                 int j, first, last;
581                 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
582                         continue;
583                 data = read_sha1_file(d->base.sha1, &type, &size);
584                 if (!data)
585                         continue;
587                 find_delta_children(&d->base, &first, &last);
588                 for (j = first; j <= last; j++) {
589                         struct object_entry *child = objects + deltas[j].obj_no;
590                         if (child->real_type == OBJ_REF_DELTA)
591                                 resolve_delta(child, data, size, type);
592                 }
594                 if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
595                         die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
596                 append_obj_to_pack(d->base.sha1, data, size, type);
597                 free(data);
598                 display_progress(progress, nr_resolved_deltas);
599         }
600         free(sorted_by_pos);
603 static 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)
608         const char *report = "pack";
609         char name[PATH_MAX];
610         int err;
612         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         }
621         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         }
643         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         }
653         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         }
664         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);
672                 /*
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         }
686 static int git_index_pack_config(const char *k, const char *v)
688         if (!strcmp(k, "pack.indexversion")) {
689                 pack_idx_default_version = git_config_int(k, v);
690                 if (pack_idx_default_version > 2)
691                         die("bad pack.indexversion=%d", pack_idx_default_version);
692                 return 0;
693         }
694         return git_default_config(k, v);
697 int main(int argc, char **argv)
699         int i, fix_thin_pack = 0;
700         char *curr_pack, *pack_name = NULL;
701         char *curr_index, *index_name = NULL;
702         const char *keep_name = NULL, *keep_msg = NULL;
703         char *index_name_buf = NULL, *keep_name_buf = NULL;
704         struct pack_idx_entry **idx_objects;
705         unsigned char sha1[20];
707         git_config(git_index_pack_config);
709         for (i = 1; i < argc; i++) {
710                 char *arg = argv[i];
712                 if (*arg == '-') {
713                         if (!strcmp(arg, "--stdin")) {
714                                 from_stdin = 1;
715                         } else if (!strcmp(arg, "--fix-thin")) {
716                                 fix_thin_pack = 1;
717                         } else if (!strcmp(arg, "--keep")) {
718                                 keep_msg = "";
719                         } else if (!prefixcmp(arg, "--keep=")) {
720                                 keep_msg = arg + 7;
721                         } else if (!prefixcmp(arg, "--pack_header=")) {
722                                 struct pack_header *hdr;
723                                 char *c;
725                                 hdr = (struct pack_header *)input_buffer;
726                                 hdr->hdr_signature = htonl(PACK_SIGNATURE);
727                                 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
728                                 if (*c != ',')
729                                         die("bad %s", arg);
730                                 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
731                                 if (*c)
732                                         die("bad %s", arg);
733                                 input_len = sizeof(*hdr);
734                         } else if (!strcmp(arg, "-v")) {
735                                 verbose = 1;
736                         } else if (!strcmp(arg, "-o")) {
737                                 if (index_name || (i+1) >= argc)
738                                         usage(index_pack_usage);
739                                 index_name = argv[++i];
740                         } else if (!prefixcmp(arg, "--index-version=")) {
741                                 char *c;
742                                 pack_idx_default_version = strtoul(arg + 16, &c, 10);
743                                 if (pack_idx_default_version > 2)
744                                         die("bad %s", arg);
745                                 if (*c == ',')
746                                         pack_idx_off32_limit = strtoul(c+1, &c, 0);
747                                 if (*c || pack_idx_off32_limit & 0x80000000)
748                                         die("bad %s", arg);
749                         } else
750                                 usage(index_pack_usage);
751                         continue;
752                 }
754                 if (pack_name)
755                         usage(index_pack_usage);
756                 pack_name = arg;
757         }
759         if (!pack_name && !from_stdin)
760                 usage(index_pack_usage);
761         if (fix_thin_pack && !from_stdin)
762                 die("--fix-thin cannot be used without --stdin");
763         if (!index_name && pack_name) {
764                 int len = strlen(pack_name);
765                 if (!has_extension(pack_name, ".pack"))
766                         die("packfile name '%s' does not end with '.pack'",
767                             pack_name);
768                 index_name_buf = xmalloc(len);
769                 memcpy(index_name_buf, pack_name, len - 5);
770                 strcpy(index_name_buf + len - 5, ".idx");
771                 index_name = index_name_buf;
772         }
773         if (keep_msg && !keep_name && pack_name) {
774                 int len = strlen(pack_name);
775                 if (!has_extension(pack_name, ".pack"))
776                         die("packfile name '%s' does not end with '.pack'",
777                             pack_name);
778                 keep_name_buf = xmalloc(len);
779                 memcpy(keep_name_buf, pack_name, len - 5);
780                 strcpy(keep_name_buf + len - 5, ".keep");
781                 keep_name = keep_name_buf;
782         }
784         curr_pack = open_pack_file(pack_name);
785         parse_pack_header();
786         objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
787         deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
788         parse_pack_objects(sha1);
789         if (nr_deltas == nr_resolved_deltas) {
790                 stop_progress(&progress);
791                 /* Flush remaining pack final 20-byte SHA1. */
792                 flush();
793         } else {
794                 if (fix_thin_pack) {
795                         char msg[48];
796                         int nr_unresolved = nr_deltas - nr_resolved_deltas;
797                         int nr_objects_initial = nr_objects;
798                         if (nr_unresolved <= 0)
799                                 die("confusion beyond insanity");
800                         objects = xrealloc(objects,
801                                            (nr_objects + nr_unresolved + 1)
802                                            * sizeof(*objects));
803                         fix_unresolved_deltas(nr_unresolved);
804                         sprintf(msg, "completed with %d local objects",
805                                 nr_objects - nr_objects_initial);
806                         stop_progress_msg(&progress, msg);
807                         fixup_pack_header_footer(output_fd, sha1,
808                                                  curr_pack, nr_objects);
809                 }
810                 if (nr_deltas != nr_resolved_deltas)
811                         die("pack has %d unresolved deltas",
812                             nr_deltas - nr_resolved_deltas);
813         }
814         free(deltas);
816         idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
817         for (i = 0; i < nr_objects; i++)
818                 idx_objects[i] = &objects[i].idx;
819         curr_index = write_idx_file(index_name, idx_objects, nr_objects, sha1);
820         free(idx_objects);
822         final(pack_name, curr_pack,
823                 index_name, curr_index,
824                 keep_name, keep_msg,
825                 sha1);
826         free(objects);
827         free(index_name_buf);
828         free(keep_name_buf);
829         if (pack_name == NULL)
830                 free(curr_pack);
831         if (index_name == NULL)
832                 free(curr_index);
834         return 0;