increase portability of NORETURN declarations
[git/git.git] / index-pack.c
CommitLineData
9cf6d335
SV
1#include "cache.h"
2#include "delta.h"
3#include "pack.h"
4#include "csum-file.h"
8e440259
PE
5#include "blob.h"
6#include "commit.h"
7#include "tag.h"
8#include "tree.h"
96a02f8f 9#include "progress.h"
0153be05 10#include "fsck.h"
2fb3f6db 11#include "exec_cmd.h"
9cf6d335
SV
12
13static const char index_pack_usage[] =
1b1dd23f 14"git index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] [--strict] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }";
9cf6d335
SV
15
16struct object_entry
17{
aa7e44bf 18 struct pack_idx_entry idx;
2d477051
NP
19 unsigned long size;
20 unsigned int hdr_size;
9cf6d335
SV
21 enum object_type type;
22 enum object_type real_type;
9cf6d335
SV
23};
24
53dda6ff
NP
25union delta_base {
26 unsigned char sha1[20];
d7dd0223 27 off_t offset;
53dda6ff
NP
28};
29
f41aebd4 30struct base_data {
4a438cab
SP
31 struct base_data *base;
32 struct base_data *child;
03993e13 33 struct object_entry *obj;
f41aebd4
SP
34 void *data;
35 unsigned long size;
36};
37
3c552873
NP
38/*
39 * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
40 * to memcmp() only the first 20 bytes.
41 */
42#define UNION_BASE_SZ 20
43
0153be05
MK
44#define FLAG_LINK (1u<<20)
45#define FLAG_CHECKED (1u<<21)
46
9cf6d335
SV
47struct delta_entry
48{
53dda6ff 49 union delta_base base;
636171cb 50 int obj_no;
9cf6d335
SV
51};
52
9cf6d335
SV
53static struct object_entry *objects;
54static struct delta_entry *deltas;
4a438cab 55static struct base_data *base_cache;
92392b4a 56static size_t base_cache_used;
9cf6d335
SV
57static int nr_objects;
58static int nr_deltas;
636171cb 59static int nr_resolved_deltas;
9cf6d335 60
e42797f5 61static int from_stdin;
0153be05 62static int strict;
3c9af366
NP
63static int verbose;
64
dc6a0757 65static struct progress *progress;
e42797f5 66
2d477051
NP
67/* We always read in 4kB chunks. */
68static unsigned char input_buffer[4096];
d7dd0223
NP
69static unsigned int input_offset, input_len;
70static off_t consumed_bytes;
9126f009 71static git_SHA_CTX input_ctx;
ee5743ce 72static uint32_t input_crc32;
6d2fa7f1 73static int input_fd, output_fd, pack_fd;
2d477051 74
0153be05
MK
75static int mark_link(struct object *obj, int type, void *data)
76{
77 if (!obj)
78 return -1;
79
80 if (type != OBJ_ANY && obj->type != type)
81 die("object type mismatch at %s", sha1_to_hex(obj->sha1));
82
83 obj->flags |= FLAG_LINK;
84 return 0;
85}
86
87/* The content of each linked object must have been checked
88 or it must be already present in the object database */
89static void check_object(struct object *obj)
90{
91 if (!obj)
92 return;
93
94 if (!(obj->flags & FLAG_LINK))
95 return;
96
97 if (!(obj->flags & FLAG_CHECKED)) {
98 unsigned long size;
99 int type = sha1_object_info(obj->sha1, &size);
100 if (type != obj->type || type <= 0)
101 die("object of unexpected type");
102 obj->flags |= FLAG_CHECKED;
103 return;
104 }
105}
106
107static void check_objects(void)
108{
109 unsigned i, max;
110
111 max = get_max_object_index();
112 for (i = 0; i < max; i++)
113 check_object(get_indexed_object(i));
114}
115
116
636171cb 117/* Discard current buffer used content. */
a6e8a767 118static void flush(void)
636171cb
NP
119{
120 if (input_offset) {
121 if (output_fd >= 0)
122 write_or_die(output_fd, input_buffer, input_offset);
9126f009 123 git_SHA1_Update(&input_ctx, input_buffer, input_offset);
554a2636 124 memmove(input_buffer, input_buffer + input_offset, input_len);
636171cb
NP
125 input_offset = 0;
126 }
127}
128
2d477051
NP
129/*
130 * Make sure at least "min" bytes are available in the buffer, and
131 * return the pointer to the buffer.
132 */
b89c4e93 133static void *fill(int min)
9cf6d335 134{
2d477051
NP
135 if (min <= input_len)
136 return input_buffer + input_offset;
137 if (min > sizeof(input_buffer))
138 die("cannot fill %d bytes", min);
636171cb 139 flush();
2d477051 140 do {
8a912bcb 141 ssize_t ret = xread(input_fd, input_buffer + input_len,
2d477051
NP
142 sizeof(input_buffer) - input_len);
143 if (ret <= 0) {
144 if (!ret)
145 die("early EOF");
d824cbba 146 die_errno("read error on input");
2d477051
NP
147 }
148 input_len += ret;
218558af
NP
149 if (from_stdin)
150 display_throughput(progress, consumed_bytes + input_len);
2d477051
NP
151 } while (input_len < min);
152 return input_buffer;
153}
154
155static void use(int bytes)
156{
157 if (bytes > input_len)
158 die("used more bytes than were available");
ee5743ce 159 input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
2d477051
NP
160 input_len -= bytes;
161 input_offset += bytes;
d7dd0223
NP
162
163 /* make sure off_t is sufficiently large not to wrap */
164 if (consumed_bytes > consumed_bytes + bytes)
165 die("pack too large for current definition of off_t");
2d477051
NP
166 consumed_bytes += bytes;
167}
9cf6d335 168
4049b9cf 169static char *open_pack_file(char *pack_name)
2d477051 170{
e42797f5
NP
171 if (from_stdin) {
172 input_fd = 0;
173 if (!pack_name) {
174 static char tmpfile[PATH_MAX];
6e180cdc
JH
175 output_fd = odb_mkstemp(tmpfile, sizeof(tmpfile),
176 "pack/tmp_pack_XXXXXX");
e42797f5
NP
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)
d824cbba 181 die_errno("unable to create '%s'", pack_name);
6d2fa7f1 182 pack_fd = output_fd;
e42797f5
NP
183 } else {
184 input_fd = open(pack_name, O_RDONLY);
185 if (input_fd < 0)
d824cbba 186 die_errno("cannot open packfile '%s'", pack_name);
e42797f5 187 output_fd = -1;
6d2fa7f1 188 pack_fd = input_fd;
e42797f5 189 }
9126f009 190 git_SHA1_Init(&input_ctx);
e42797f5 191 return pack_name;
9cf6d335
SV
192}
193
194static void parse_pack_header(void)
195{
2d477051 196 struct pack_header *hdr = fill(sizeof(struct pack_header));
9cf6d335
SV
197
198 /* Header consistency check */
9cf6d335 199 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
e42797f5 200 die("pack signature mismatch");
d60fc1c8 201 if (!pack_version_ok(hdr->hdr_version))
6e1c2344
RJ
202 die("pack version %"PRIu32" unsupported",
203 ntohl(hdr->hdr_version));
9cf6d335
SV
204
205 nr_objects = ntohl(hdr->hdr_entries);
2d477051 206 use(sizeof(struct pack_header));
9cf6d335
SV
207}
208
a4f3131c
EFL
209static NORETURN void bad_object(unsigned long offset, const char *format,
210 ...) __attribute__((format (printf, 2, 3)));
9cf6d335
SV
211
212static void bad_object(unsigned long offset, const char *format, ...)
213{
214 va_list params;
215 char buf[1024];
216
217 va_start(params, format);
218 vsnprintf(buf, sizeof(buf), format, params);
219 va_end(params);
e42797f5 220 die("pack has bad object at offset %lu: %s", offset, buf);
9cf6d335
SV
221}
222
6a87ed97
NP
223static void free_base_data(struct base_data *c)
224{
225 if (c->data) {
226 free(c->data);
227 c->data = NULL;
228 base_cache_used -= c->size;
229 }
230}
231
92392b4a
SP
232static void prune_base_data(struct base_data *retain)
233{
8e24cbae 234 struct base_data *b;
92392b4a
SP
235 for (b = base_cache;
236 base_cache_used > delta_base_cache_limit && b;
237 b = b->child) {
6a87ed97
NP
238 if (b->data && b != retain)
239 free_base_data(b);
92392b4a
SP
240 }
241}
242
4a438cab
SP
243static void link_base_data(struct base_data *base, struct base_data *c)
244{
245 if (base)
246 base->child = c;
247 else
248 base_cache = c;
249
250 c->base = base;
251 c->child = NULL;
9441b61d
NP
252 if (c->data)
253 base_cache_used += c->size;
92392b4a 254 prune_base_data(c);
4a438cab
SP
255}
256
257static void unlink_base_data(struct base_data *c)
258{
259 struct base_data *base = c->base;
260 if (base)
261 base->child = NULL;
262 else
263 base_cache = NULL;
6a87ed97 264 free_base_data(c);
4a438cab
SP
265}
266
2d477051 267static void *unpack_entry_data(unsigned long offset, unsigned long size)
9cf6d335 268{
9cf6d335
SV
269 z_stream stream;
270 void *buf = xmalloc(size);
271
272 memset(&stream, 0, sizeof(stream));
273 stream.next_out = buf;
274 stream.avail_out = size;
2d477051
NP
275 stream.next_in = fill(1);
276 stream.avail_in = input_len;
39c68542 277 git_inflate_init(&stream);
9cf6d335
SV
278
279 for (;;) {
39c68542 280 int ret = git_inflate(&stream, 0);
2d477051
NP
281 use(input_len - stream.avail_in);
282 if (stream.total_out == size && ret == Z_STREAM_END)
9cf6d335
SV
283 break;
284 if (ret != Z_OK)
285 bad_object(offset, "inflate returned %d", ret);
2d477051
NP
286 stream.next_in = fill(1);
287 stream.avail_in = input_len;
9cf6d335 288 }
39c68542 289 git_inflate_end(&stream);
9cf6d335
SV
290 return buf;
291}
292
2d477051 293static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
9cf6d335 294{
48fb7deb
LT
295 unsigned char *p;
296 unsigned long size, c;
d7dd0223 297 off_t base_offset;
9cf6d335 298 unsigned shift;
ee5743ce 299 void *data;
9cf6d335 300
aa7e44bf 301 obj->idx.offset = consumed_bytes;
ee5743ce 302 input_crc32 = crc32(0, Z_NULL, 0);
2d477051
NP
303
304 p = fill(1);
305 c = *p;
306 use(1);
307 obj->type = (c >> 4) & 7;
9cf6d335
SV
308 size = (c & 15);
309 shift = 4;
310 while (c & 0x80) {
2d477051
NP
311 p = fill(1);
312 c = *p;
313 use(1);
48fb7deb 314 size += (c & 0x7f) << shift;
9cf6d335
SV
315 shift += 7;
316 }
2d477051 317 obj->size = size;
9cf6d335 318
2d477051 319 switch (obj->type) {
eb32d236 320 case OBJ_REF_DELTA:
2d477051
NP
321 hashcpy(delta_base->sha1, fill(20));
322 use(20);
53dda6ff
NP
323 break;
324 case OBJ_OFS_DELTA:
325 memset(delta_base, 0, sizeof(*delta_base));
2d477051
NP
326 p = fill(1);
327 c = *p;
328 use(1);
53dda6ff
NP
329 base_offset = c & 127;
330 while (c & 128) {
331 base_offset += 1;
8723f216 332 if (!base_offset || MSB(base_offset, 7))
aa7e44bf 333 bad_object(obj->idx.offset, "offset value overflow for delta base object");
2d477051
NP
334 p = fill(1);
335 c = *p;
336 use(1);
53dda6ff
NP
337 base_offset = (base_offset << 7) + (c & 127);
338 }
aa7e44bf 339 delta_base->offset = obj->idx.offset - base_offset;
d8f32556 340 if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
aa7e44bf 341 bad_object(obj->idx.offset, "delta base offset is out of bound");
53dda6ff 342 break;
9cf6d335
SV
343 case OBJ_COMMIT:
344 case OBJ_TREE:
345 case OBJ_BLOB:
346 case OBJ_TAG:
9cf6d335
SV
347 break;
348 default:
aa7e44bf 349 bad_object(obj->idx.offset, "unknown object type %d", obj->type);
9cf6d335 350 }
aa7e44bf 351 obj->hdr_size = consumed_bytes - obj->idx.offset;
2d477051 352
aa7e44bf
GB
353 data = unpack_entry_data(obj->idx.offset, obj->size);
354 obj->idx.crc32 = input_crc32;
ee5743ce 355 return data;
2d477051
NP
356}
357
b89c4e93 358static void *get_data_from_pack(struct object_entry *obj)
2d477051 359{
a91ef6e7 360 off_t from = obj[0].idx.offset + obj[0].hdr_size;
aa7e44bf 361 unsigned long len = obj[1].idx.offset - from;
a91d49cd 362 unsigned long rdy = 0;
6d2fa7f1 363 unsigned char *src, *data;
2d477051
NP
364 z_stream stream;
365 int st;
9cf6d335 366
6d2fa7f1 367 src = xmalloc(len);
a91d49cd
SP
368 data = src;
369 do {
370 ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
fb742436 371 if (n < 0)
d824cbba 372 die_errno("cannot pread pack file");
fb742436
ST
373 if (!n)
374 die("premature end of pack file, %lu bytes missing",
375 len - rdy);
a91d49cd
SP
376 rdy += n;
377 } while (rdy < len);
2d477051
NP
378 data = xmalloc(obj->size);
379 memset(&stream, 0, sizeof(stream));
380 stream.next_out = data;
381 stream.avail_out = obj->size;
6d2fa7f1 382 stream.next_in = src;
2d477051 383 stream.avail_in = len;
39c68542
LT
384 git_inflate_init(&stream);
385 while ((st = git_inflate(&stream, Z_FINISH)) == Z_OK);
386 git_inflate_end(&stream);
2d477051
NP
387 if (st != Z_STREAM_END || stream.total_out != obj->size)
388 die("serious inflate inconsistency");
6d2fa7f1 389 free(src);
9cf6d335
SV
390 return data;
391}
392
53dda6ff 393static int find_delta(const union delta_base *base)
9cf6d335
SV
394{
395 int first = 0, last = nr_deltas;
396
397 while (first < last) {
398 int next = (first + last) / 2;
399 struct delta_entry *delta = &deltas[next];
400 int cmp;
401
3c552873 402 cmp = memcmp(base, &delta->base, UNION_BASE_SZ);
9cf6d335
SV
403 if (!cmp)
404 return next;
405 if (cmp < 0) {
406 last = next;
407 continue;
408 }
409 first = next+1;
410 }
411 return -first-1;
412}
413
6a87ed97
NP
414static void find_delta_children(const union delta_base *base,
415 int *first_index, int *last_index)
9cf6d335 416{
53dda6ff 417 int first = find_delta(base);
9cf6d335
SV
418 int last = first;
419 int end = nr_deltas - 1;
420
6a87ed97
NP
421 if (first < 0) {
422 *first_index = 0;
423 *last_index = -1;
424 return;
425 }
3c552873 426 while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ))
9cf6d335 427 --first;
3c552873 428 while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ))
9cf6d335
SV
429 ++last;
430 *first_index = first;
431 *last_index = last;
9cf6d335
SV
432}
433
434static void sha1_object(const void *data, unsigned long size,
9096c660 435 enum object_type type, unsigned char *sha1)
9cf6d335 436{
ce9fbf16 437 hash_sha1_file(data, size, typename(type), sha1);
9096c660 438 if (has_sha1_file(sha1)) {
8685da42
NP
439 void *has_data;
440 enum object_type has_type;
441 unsigned long has_size;
442 has_data = read_sha1_file(sha1, &has_type, &has_size);
443 if (!has_data)
444 die("cannot read existing object %s", sha1_to_hex(sha1));
445 if (size != has_size || type != has_type ||
446 memcmp(data, has_data, size) != 0)
447 die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
bbf4b41b 448 free(has_data);
8685da42 449 }
0153be05
MK
450 if (strict) {
451 if (type == OBJ_BLOB) {
452 struct blob *blob = lookup_blob(sha1);
453 if (blob)
454 blob->object.flags |= FLAG_CHECKED;
455 else
456 die("invalid blob object %s", sha1_to_hex(sha1));
457 } else {
458 struct object *obj;
459 int eaten;
460 void *buf = (void *) data;
461
462 /*
463 * we do not need to free the memory here, as the
464 * buf is deleted by the caller.
465 */
466 obj = parse_object_buffer(sha1, type, size, buf, &eaten);
467 if (!obj)
468 die("invalid %s", typename(type));
469 if (fsck_object(obj, 1, fsck_error_function))
470 die("Error in object");
2af202be 471 if (fsck_walk(obj, mark_link, NULL))
0153be05
MK
472 die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
473
474 if (obj->type == OBJ_TREE) {
475 struct tree *item = (struct tree *) obj;
476 item->buffer = NULL;
477 }
478 if (obj->type == OBJ_COMMIT) {
479 struct commit *commit = (struct commit *) obj;
480 commit->buffer = NULL;
481 }
482 obj->flags |= FLAG_CHECKED;
483 }
484 }
9cf6d335
SV
485}
486
92392b4a
SP
487static void *get_base_data(struct base_data *c)
488{
489 if (!c->data) {
490 struct object_entry *obj = c->obj;
491
492 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
493 void *base = get_base_data(c->base);
494 void *raw = get_data_from_pack(obj);
495 c->data = patch_delta(
496 base, c->base->size,
497 raw, obj->size,
498 &c->size);
499 free(raw);
500 if (!c->data)
501 bad_object(obj->idx.offset, "failed to apply delta");
9441b61d 502 } else {
92392b4a 503 c->data = get_data_from_pack(obj);
9441b61d
NP
504 c->size = obj->size;
505 }
92392b4a
SP
506
507 base_cache_used += c->size;
508 prune_base_data(c);
509 }
510 return c->data;
511}
512
f41aebd4 513static void resolve_delta(struct object_entry *delta_obj,
9441b61d 514 struct base_data *base, struct base_data *result)
9cf6d335 515{
ce3f6dc6 516 void *base_data, *delta_data;
9cf6d335 517
ce3f6dc6 518 delta_obj->real_type = base->obj->real_type;
636171cb 519 delta_data = get_data_from_pack(delta_obj);
ce3f6dc6 520 base_data = get_base_data(base);
9441b61d 521 result->obj = delta_obj;
ce3f6dc6
NP
522 result->data = patch_delta(base_data, base->size,
523 delta_data, delta_obj->size, &result->size);
9cf6d335 524 free(delta_data);
9441b61d 525 if (!result->data)
aa7e44bf 526 bad_object(delta_obj->idx.offset, "failed to apply delta");
9441b61d
NP
527 sha1_object(result->data, result->size, delta_obj->real_type,
528 delta_obj->idx.sha1);
636171cb 529 nr_resolved_deltas++;
9441b61d
NP
530}
531
532static void find_unresolved_deltas(struct base_data *base,
533 struct base_data *prev_base)
534{
6a87ed97 535 int i, ref_first, ref_last, ofs_first, ofs_last;
9441b61d
NP
536
537 /*
538 * This is a recursive function. Those brackets should help reducing
539 * stack usage by limiting the scope of the delta_base union.
540 */
541 {
542 union delta_base base_spec;
543
544 hashcpy(base_spec.sha1, base->obj->idx.sha1);
6a87ed97 545 find_delta_children(&base_spec, &ref_first, &ref_last);
53dda6ff 546
9441b61d
NP
547 memset(&base_spec, 0, sizeof(base_spec));
548 base_spec.offset = base->obj->idx.offset;
6a87ed97 549 find_delta_children(&base_spec, &ofs_first, &ofs_last);
9441b61d 550 }
4a438cab 551
9ed19614
NP
552 if (ref_last == -1 && ofs_last == -1) {
553 free(base->data);
9441b61d 554 return;
9ed19614 555 }
53dda6ff 556
9441b61d 557 link_base_data(prev_base, base);
4a438cab 558
6a87ed97
NP
559 for (i = ref_first; i <= ref_last; i++) {
560 struct object_entry *child = objects + deltas[i].obj_no;
561 if (child->real_type == OBJ_REF_DELTA) {
562 struct base_data result;
563 resolve_delta(child, base, &result);
564 if (i == ref_last && ofs_last == -1)
565 free_base_data(base);
566 find_unresolved_deltas(&result, base);
636171cb 567 }
53dda6ff
NP
568 }
569
6a87ed97
NP
570 for (i = ofs_first; i <= ofs_last; i++) {
571 struct object_entry *child = objects + deltas[i].obj_no;
572 if (child->real_type == OBJ_OFS_DELTA) {
573 struct base_data result;
574 resolve_delta(child, base, &result);
575 if (i == ofs_last)
576 free_base_data(base);
577 find_unresolved_deltas(&result, base);
636171cb 578 }
9cf6d335 579 }
53dda6ff 580
9441b61d 581 unlink_base_data(base);
9cf6d335
SV
582}
583
584static int compare_delta_entry(const void *a, const void *b)
585{
586 const struct delta_entry *delta_a = a;
587 const struct delta_entry *delta_b = b;
3c552873 588 return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ);
9cf6d335
SV
589}
590
2d477051
NP
591/* Parse all objects and return the pack content SHA1 hash */
592static void parse_pack_objects(unsigned char *sha1)
9cf6d335 593{
96a02f8f 594 int i;
53dda6ff 595 struct delta_entry *delta = deltas;
2d477051 596 struct stat st;
9cf6d335
SV
597
598 /*
599 * First pass:
600 * - find locations of all objects;
601 * - calculate SHA1 of all non-delta objects;
b89c4e93 602 * - remember base (SHA1 or offset) for all deltas.
9cf6d335 603 */
13aaf148 604 if (verbose)
29e63ed3
NP
605 progress = start_progress(
606 from_stdin ? "Receiving objects" : "Indexing objects",
607 nr_objects);
9cf6d335
SV
608 for (i = 0; i < nr_objects; i++) {
609 struct object_entry *obj = &objects[i];
f41aebd4 610 void *data = unpack_raw_entry(obj, &delta->base);
9cf6d335 611 obj->real_type = obj->type;
53dda6ff
NP
612 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) {
613 nr_deltas++;
636171cb 614 delta->obj_no = i;
53dda6ff 615 delta++;
9cf6d335 616 } else
aa7e44bf 617 sha1_object(data, obj->size, obj->type, obj->idx.sha1);
9cf6d335 618 free(data);
4d4fcc54 619 display_progress(progress, i+1);
9cf6d335 620 }
aa7e44bf 621 objects[i].idx.offset = consumed_bytes;
4d4fcc54 622 stop_progress(&progress);
2d477051
NP
623
624 /* Check pack integrity */
636171cb 625 flush();
9126f009 626 git_SHA1_Final(sha1, &input_ctx);
2d477051 627 if (hashcmp(fill(20), sha1))
e42797f5 628 die("pack is corrupted (SHA1 mismatch)");
9bee2478 629 use(20);
2d477051
NP
630
631 /* If input_fd is a file, we should have reached its end now. */
632 if (fstat(input_fd, &st))
d824cbba 633 die_errno("cannot fstat packfile");
fa257b05
JS
634 if (S_ISREG(st.st_mode) &&
635 lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
e42797f5 636 die("pack has junk at the end");
9cf6d335 637
3c9af366
NP
638 if (!nr_deltas)
639 return;
640
53dda6ff 641 /* Sort deltas by base SHA1/offset for fast searching */
9cf6d335
SV
642 qsort(deltas, nr_deltas, sizeof(struct delta_entry),
643 compare_delta_entry);
644
645 /*
646 * Second pass:
647 * - for all non-delta objects, look if it is used as a base for
648 * deltas;
649 * - if used as a base, uncompress the object and apply all deltas,
650 * recursively checking if the resulting object is used as a base
651 * for some more deltas.
652 */
13aaf148 653 if (verbose)
dc6a0757 654 progress = start_progress("Resolving deltas", nr_deltas);
9cf6d335
SV
655 for (i = 0; i < nr_objects; i++) {
656 struct object_entry *obj = &objects[i];
f41aebd4 657 struct base_data base_obj;
9cf6d335 658
53dda6ff 659 if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
9cf6d335 660 continue;
03993e13 661 base_obj.obj = obj;
9441b61d
NP
662 base_obj.data = NULL;
663 find_unresolved_deltas(&base_obj, NULL);
4d4fcc54 664 display_progress(progress, nr_resolved_deltas);
9cf6d335 665 }
636171cb
NP
666}
667
8522148f 668static int write_compressed(struct sha1file *f, void *in, unsigned int size)
636171cb
NP
669{
670 z_stream stream;
671 unsigned long maxsize;
672 void *out;
673
674 memset(&stream, 0, sizeof(stream));
675 deflateInit(&stream, zlib_compression_level);
676 maxsize = deflateBound(&stream, size);
677 out = xmalloc(maxsize);
678
679 /* Compress it */
680 stream.next_in = in;
681 stream.avail_in = size;
682 stream.next_out = out;
683 stream.avail_out = maxsize;
684 while (deflate(&stream, Z_FINISH) == Z_OK);
685 deflateEnd(&stream);
686
687 size = stream.total_out;
8522148f 688 sha1write(f, out, size);
636171cb
NP
689 free(out);
690 return size;
691}
692
8522148f 693static struct object_entry *append_obj_to_pack(struct sha1file *f,
03993e13 694 const unsigned char *sha1, void *buf,
636171cb
NP
695 unsigned long size, enum object_type type)
696{
697 struct object_entry *obj = &objects[nr_objects++];
698 unsigned char header[10];
699 unsigned long s = size;
700 int n = 0;
701 unsigned char c = (type << 4) | (s & 15);
702 s >>= 4;
703 while (s) {
704 header[n++] = c | 0x80;
705 c = s & 0x7f;
706 s >>= 7;
707 }
708 header[n++] = c;
8522148f
NP
709 crc32_begin(f);
710 sha1write(f, header, n);
72de2883
BS
711 obj[0].size = size;
712 obj[0].hdr_size = n;
713 obj[0].type = type;
714 obj[0].real_type = type;
aa7e44bf 715 obj[1].idx.offset = obj[0].idx.offset + n;
8522148f
NP
716 obj[1].idx.offset += write_compressed(f, buf, size);
717 obj[0].idx.crc32 = crc32_end(f);
838cd346 718 sha1flush(f);
aa7e44bf 719 hashcpy(obj->idx.sha1, sha1);
03993e13 720 return obj;
636171cb
NP
721}
722
723static int delta_pos_compare(const void *_a, const void *_b)
724{
725 struct delta_entry *a = *(struct delta_entry **)_a;
726 struct delta_entry *b = *(struct delta_entry **)_b;
727 return a->obj_no - b->obj_no;
728}
9cf6d335 729
8522148f 730static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
636171cb
NP
731{
732 struct delta_entry **sorted_by_pos;
96a02f8f 733 int i, n = 0;
636171cb
NP
734
735 /*
736 * Since many unresolved deltas may well be themselves base objects
737 * for more unresolved deltas, we really want to include the
738 * smallest number of base objects that would cover as much delta
739 * as possible by picking the
740 * trunc deltas first, allowing for other deltas to resolve without
741 * additional base objects. Since most base objects are to be found
742 * before deltas depending on them, a good heuristic is to start
743 * resolving deltas in the same order as their position in the pack.
744 */
745 sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos));
9cf6d335 746 for (i = 0; i < nr_deltas; i++) {
636171cb
NP
747 if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA)
748 continue;
749 sorted_by_pos[n++] = &deltas[i];
9cf6d335 750 }
636171cb
NP
751 qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare);
752
753 for (i = 0; i < n; i++) {
754 struct delta_entry *d = sorted_by_pos[i];
21666f1a 755 enum object_type type;
f41aebd4 756 struct base_data base_obj;
636171cb
NP
757
758 if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
759 continue;
f41aebd4
SP
760 base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size);
761 if (!base_obj.data)
636171cb 762 continue;
636171cb 763
03993e13
SP
764 if (check_sha1_signature(d->base.sha1, base_obj.data,
765 base_obj.size, typename(type)))
766 die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
8522148f
NP
767 base_obj.obj = append_obj_to_pack(f, d->base.sha1,
768 base_obj.data, base_obj.size, type);
9441b61d 769 find_unresolved_deltas(&base_obj, NULL);
4d4fcc54 770 display_progress(progress, nr_resolved_deltas);
636171cb
NP
771 }
772 free(sorted_by_pos);
773}
774
e42797f5
NP
775static void final(const char *final_pack_name, const char *curr_pack_name,
776 const char *final_index_name, const char *curr_index_name,
b8077709 777 const char *keep_name, const char *keep_msg,
e42797f5
NP
778 unsigned char *sha1)
779{
3a55602e 780 const char *report = "pack";
e42797f5
NP
781 char name[PATH_MAX];
782 int err;
783
784 if (!from_stdin) {
785 close(input_fd);
786 } else {
4c81b03e 787 fsync_or_die(output_fd, curr_pack_name);
e42797f5
NP
788 err = close(output_fd);
789 if (err)
d824cbba 790 die_errno("error while closing pack file");
e42797f5
NP
791 }
792
b8077709
SP
793 if (keep_msg) {
794 int keep_fd, keep_msg_len = strlen(keep_msg);
6e180cdc
JH
795
796 if (!keep_name)
797 keep_fd = odb_pack_keep(name, sizeof(name), sha1);
798 else
799 keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600);
800
9ca4a201
NP
801 if (keep_fd < 0) {
802 if (errno != EEXIST)
d824cbba
TR
803 die_errno("cannot write keep file '%s'",
804 keep_name);
9ca4a201
NP
805 } else {
806 if (keep_msg_len > 0) {
807 write_or_die(keep_fd, keep_msg, keep_msg_len);
808 write_or_die(keep_fd, "\n", 1);
809 }
91c8d590 810 if (close(keep_fd) != 0)
d824cbba
TR
811 die_errno("cannot close written keep file '%s'",
812 keep_name);
576162a4 813 report = "keep";
b8077709 814 }
b8077709
SP
815 }
816
e42797f5
NP
817 if (final_pack_name != curr_pack_name) {
818 if (!final_pack_name) {
819 snprintf(name, sizeof(name), "%s/pack/pack-%s.pack",
820 get_object_directory(), sha1_to_hex(sha1));
821 final_pack_name = name;
822 }
823 if (move_temp_to_file(curr_pack_name, final_pack_name))
824 die("cannot store pack file");
fb8b1936 825 } else if (from_stdin)
33b65030 826 chmod(final_pack_name, 0444);
e42797f5 827
e42797f5
NP
828 if (final_index_name != curr_index_name) {
829 if (!final_index_name) {
830 snprintf(name, sizeof(name), "%s/pack/pack-%s.idx",
831 get_object_directory(), sha1_to_hex(sha1));
832 final_index_name = name;
833 }
834 if (move_temp_to_file(curr_index_name, final_index_name))
835 die("cannot store index file");
fb8b1936
JH
836 } else
837 chmod(final_index_name, 0444);
576162a4
NP
838
839 if (!from_stdin) {
840 printf("%s\n", sha1_to_hex(sha1));
841 } else {
842 char buf[48];
843 int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
844 report, sha1_to_hex(sha1));
d1b2ddc8 845 write_or_die(1, buf, len);
576162a4
NP
846
847 /*
848 * Let's just mimic git-unpack-objects here and write
849 * the last part of the input buffer to stdout.
850 */
851 while (input_len) {
852 err = xwrite(1, input_buffer + input_offset, input_len);
853 if (err <= 0)
854 break;
855 input_len -= err;
856 input_offset += err;
857 }
858 }
9cf6d335
SV
859}
860
ef90d6d4 861static int git_index_pack_config(const char *k, const char *v, void *cb)
4d00bda2
NP
862{
863 if (!strcmp(k, "pack.indexversion")) {
864 pack_idx_default_version = git_config_int(k, v);
865 if (pack_idx_default_version > 2)
6e1c2344
RJ
866 die("bad pack.indexversion=%"PRIu32,
867 pack_idx_default_version);
4d00bda2
NP
868 return 0;
869 }
ef90d6d4 870 return git_default_config(k, v, cb);
4d00bda2
NP
871}
872
9cf6d335
SV
873int main(int argc, char **argv)
874{
636171cb 875 int i, fix_thin_pack = 0;
4049b9cf
NP
876 char *curr_pack, *pack_name = NULL;
877 char *curr_index, *index_name = NULL;
b8077709
SP
878 const char *keep_name = NULL, *keep_msg = NULL;
879 char *index_name_buf = NULL, *keep_name_buf = NULL;
aa7e44bf 880 struct pack_idx_entry **idx_objects;
8522148f 881 unsigned char pack_sha1[20];
9cf6d335 882
2fb3f6db
SP
883 git_extract_argv0_path(argv[0]);
884
a672ea6a
NP
885 /*
886 * We wish to read the repository's config file if any, and
887 * for that it is necessary to call setup_git_directory_gently().
888 * However if the cwd was inside .git/objects/pack/ then we need
889 * to go back there or all the pack name arguments will be wrong.
890 * And in that case we cannot rely on any prefix returned by
891 * setup_git_directory_gently() either.
892 */
893 {
894 char cwd[PATH_MAX+1];
895 int nongit;
896
897 if (!getcwd(cwd, sizeof(cwd)-1))
898 die("Unable to get current working directory");
899 setup_git_directory_gently(&nongit);
900 git_config(git_index_pack_config, NULL);
901 if (chdir(cwd))
902 die("Cannot come back to cwd");
903 }
4d00bda2 904
9cf6d335 905 for (i = 1; i < argc; i++) {
4049b9cf 906 char *arg = argv[i];
9cf6d335
SV
907
908 if (*arg == '-') {
e42797f5
NP
909 if (!strcmp(arg, "--stdin")) {
910 from_stdin = 1;
636171cb
NP
911 } else if (!strcmp(arg, "--fix-thin")) {
912 fix_thin_pack = 1;
0153be05
MK
913 } else if (!strcmp(arg, "--strict")) {
914 strict = 1;
b8077709
SP
915 } else if (!strcmp(arg, "--keep")) {
916 keep_msg = "";
cc44c765 917 } else if (!prefixcmp(arg, "--keep=")) {
b8077709 918 keep_msg = arg + 7;
cc44c765 919 } else if (!prefixcmp(arg, "--pack_header=")) {
bed006fb
NP
920 struct pack_header *hdr;
921 char *c;
922
923 hdr = (struct pack_header *)input_buffer;
924 hdr->hdr_signature = htonl(PACK_SIGNATURE);
925 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
926 if (*c != ',')
927 die("bad %s", arg);
928 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
929 if (*c)
930 die("bad %s", arg);
931 input_len = sizeof(*hdr);
3c9af366
NP
932 } else if (!strcmp(arg, "-v")) {
933 verbose = 1;
e42797f5 934 } else if (!strcmp(arg, "-o")) {
9cf6d335
SV
935 if (index_name || (i+1) >= argc)
936 usage(index_pack_usage);
937 index_name = argv[++i];
4ba7d711
NP
938 } else if (!prefixcmp(arg, "--index-version=")) {
939 char *c;
aa7e44bf
GB
940 pack_idx_default_version = strtoul(arg + 16, &c, 10);
941 if (pack_idx_default_version > 2)
4ba7d711
NP
942 die("bad %s", arg);
943 if (*c == ',')
aa7e44bf
GB
944 pack_idx_off32_limit = strtoul(c+1, &c, 0);
945 if (*c || pack_idx_off32_limit & 0x80000000)
4ba7d711 946 die("bad %s", arg);
9cf6d335
SV
947 } else
948 usage(index_pack_usage);
949 continue;
950 }
951
952 if (pack_name)
953 usage(index_pack_usage);
954 pack_name = arg;
955 }
956
e42797f5 957 if (!pack_name && !from_stdin)
9cf6d335 958 usage(index_pack_usage);
636171cb
NP
959 if (fix_thin_pack && !from_stdin)
960 die("--fix-thin cannot be used without --stdin");
e42797f5 961 if (!index_name && pack_name) {
9cf6d335 962 int len = strlen(pack_name);
5bb1cda5 963 if (!has_extension(pack_name, ".pack"))
9cf6d335
SV
964 die("packfile name '%s' does not end with '.pack'",
965 pack_name);
6689f087 966 index_name_buf = xmalloc(len);
9cf6d335
SV
967 memcpy(index_name_buf, pack_name, len - 5);
968 strcpy(index_name_buf + len - 5, ".idx");
969 index_name = index_name_buf;
970 }
b8077709
SP
971 if (keep_msg && !keep_name && pack_name) {
972 int len = strlen(pack_name);
973 if (!has_extension(pack_name, ".pack"))
974 die("packfile name '%s' does not end with '.pack'",
975 pack_name);
976 keep_name_buf = xmalloc(len);
977 memcpy(keep_name_buf, pack_name, len - 5);
978 strcpy(keep_name_buf + len - 5, ".keep");
979 keep_name = keep_name_buf;
980 }
9cf6d335 981
e42797f5 982 curr_pack = open_pack_file(pack_name);
9cf6d335 983 parse_pack_header();
636171cb
NP
984 objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry));
985 deltas = xmalloc(nr_objects * sizeof(struct delta_entry));
8522148f 986 parse_pack_objects(pack_sha1);
96a02f8f 987 if (nr_deltas == nr_resolved_deltas) {
4d4fcc54 988 stop_progress(&progress);
96a02f8f
NP
989 /* Flush remaining pack final 20-byte SHA1. */
990 flush();
991 } else {
636171cb 992 if (fix_thin_pack) {
8522148f
NP
993 struct sha1file *f;
994 unsigned char read_sha1[20], tail_sha1[20];
a984a06a 995 char msg[48];
636171cb 996 int nr_unresolved = nr_deltas - nr_resolved_deltas;
3c9af366 997 int nr_objects_initial = nr_objects;
636171cb
NP
998 if (nr_unresolved <= 0)
999 die("confusion beyond insanity");
1000 objects = xrealloc(objects,
1001 (nr_objects + nr_unresolved + 1)
1002 * sizeof(*objects));
8522148f
NP
1003 f = sha1fd(output_fd, curr_pack);
1004 fix_unresolved_deltas(f, nr_unresolved);
a984a06a
NP
1005 sprintf(msg, "completed with %d local objects",
1006 nr_objects - nr_objects_initial);
1007 stop_progress_msg(&progress, msg);
8522148f
NP
1008 sha1close(f, tail_sha1, 0);
1009 hashcpy(read_sha1, pack_sha1);
1010 fixup_pack_header_footer(output_fd, pack_sha1,
abeb40e5 1011 curr_pack, nr_objects,
8522148f
NP
1012 read_sha1, consumed_bytes-20);
1013 if (hashcmp(read_sha1, tail_sha1) != 0)
1014 die("Unexpected tail checksum for %s "
1015 "(disk corruption?)", curr_pack);
636171cb
NP
1016 }
1017 if (nr_deltas != nr_resolved_deltas)
1018 die("pack has %d unresolved deltas",
1019 nr_deltas - nr_resolved_deltas);
636171cb 1020 }
9cf6d335 1021 free(deltas);
0153be05
MK
1022 if (strict)
1023 check_objects();
aa7e44bf
GB
1024
1025 idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));
1026 for (i = 0; i < nr_objects; i++)
1027 idx_objects[i] = &objects[i].idx;
8522148f 1028 curr_index = write_idx_file(index_name, idx_objects, nr_objects, pack_sha1);
aa7e44bf
GB
1029 free(idx_objects);
1030
b8077709
SP
1031 final(pack_name, curr_pack,
1032 index_name, curr_index,
1033 keep_name, keep_msg,
8522148f 1034 pack_sha1);
9cf6d335
SV
1035 free(objects);
1036 free(index_name_buf);
b8077709 1037 free(keep_name_buf);
c85228ed
NP
1038 if (pack_name == NULL)
1039 free(curr_pack);
1040 if (index_name == NULL)
1041 free(curr_index);
9cf6d335
SV
1042
1043 return 0;
1044}