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Commit | Line | Data |
---|---|---|
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" |
9cf6d335 SV |
10 | |
11 | static const char index_pack_usage[] = | |
b8077709 | 12 | "git-index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }"; |
9cf6d335 SV |
13 | |
14 | struct object_entry | |
15 | { | |
d7dd0223 | 16 | off_t offset; |
2d477051 NP |
17 | unsigned long size; |
18 | unsigned int hdr_size; | |
ee5743ce | 19 | uint32_t crc32; |
9cf6d335 SV |
20 | enum object_type type; |
21 | enum object_type real_type; | |
22 | unsigned char sha1[20]; | |
23 | }; | |
24 | ||
53dda6ff NP |
25 | union delta_base { |
26 | unsigned char sha1[20]; | |
d7dd0223 | 27 | off_t offset; |
53dda6ff NP |
28 | }; |
29 | ||
3c552873 NP |
30 | /* |
31 | * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want | |
32 | * to memcmp() only the first 20 bytes. | |
33 | */ | |
34 | #define UNION_BASE_SZ 20 | |
35 | ||
9cf6d335 SV |
36 | struct delta_entry |
37 | { | |
53dda6ff | 38 | union delta_base base; |
636171cb | 39 | int obj_no; |
9cf6d335 SV |
40 | }; |
41 | ||
9cf6d335 SV |
42 | static struct object_entry *objects; |
43 | static struct delta_entry *deltas; | |
44 | static int nr_objects; | |
45 | static int nr_deltas; | |
636171cb | 46 | static int nr_resolved_deltas; |
9cf6d335 | 47 | |
e42797f5 | 48 | static int from_stdin; |
3c9af366 NP |
49 | static int verbose; |
50 | ||
96a02f8f | 51 | static struct progress progress; |
e42797f5 | 52 | |
2d477051 NP |
53 | /* We always read in 4kB chunks. */ |
54 | static unsigned char input_buffer[4096]; | |
d7dd0223 NP |
55 | static unsigned int input_offset, input_len; |
56 | static off_t consumed_bytes; | |
2d477051 | 57 | static SHA_CTX input_ctx; |
ee5743ce | 58 | static uint32_t input_crc32; |
6d2fa7f1 | 59 | static int input_fd, output_fd, pack_fd; |
2d477051 | 60 | |
636171cb | 61 | /* Discard current buffer used content. */ |
a6e8a767 | 62 | static void flush(void) |
636171cb NP |
63 | { |
64 | if (input_offset) { | |
65 | if (output_fd >= 0) | |
66 | write_or_die(output_fd, input_buffer, input_offset); | |
67 | SHA1_Update(&input_ctx, input_buffer, input_offset); | |
554a2636 | 68 | memmove(input_buffer, input_buffer + input_offset, input_len); |
636171cb NP |
69 | input_offset = 0; |
70 | } | |
71 | } | |
72 | ||
2d477051 NP |
73 | /* |
74 | * Make sure at least "min" bytes are available in the buffer, and | |
75 | * return the pointer to the buffer. | |
76 | */ | |
b89c4e93 | 77 | static void *fill(int min) |
9cf6d335 | 78 | { |
2d477051 NP |
79 | if (min <= input_len) |
80 | return input_buffer + input_offset; | |
81 | if (min > sizeof(input_buffer)) | |
82 | die("cannot fill %d bytes", min); | |
636171cb | 83 | flush(); |
2d477051 | 84 | do { |
8a912bcb | 85 | ssize_t ret = xread(input_fd, input_buffer + input_len, |
2d477051 NP |
86 | sizeof(input_buffer) - input_len); |
87 | if (ret <= 0) { | |
88 | if (!ret) | |
89 | die("early EOF"); | |
90 | die("read error on input: %s", strerror(errno)); | |
91 | } | |
92 | input_len += ret; | |
93 | } while (input_len < min); | |
94 | return input_buffer; | |
95 | } | |
96 | ||
97 | static void use(int bytes) | |
98 | { | |
99 | if (bytes > input_len) | |
100 | die("used more bytes than were available"); | |
ee5743ce | 101 | input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes); |
2d477051 NP |
102 | input_len -= bytes; |
103 | input_offset += bytes; | |
d7dd0223 NP |
104 | |
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"); | |
2d477051 NP |
108 | consumed_bytes += bytes; |
109 | } | |
9cf6d335 | 110 | |
b89c4e93 | 111 | static const char *open_pack_file(const char *pack_name) |
2d477051 | 112 | { |
e42797f5 NP |
113 | if (from_stdin) { |
114 | input_fd = 0; | |
115 | if (!pack_name) { | |
116 | static char tmpfile[PATH_MAX]; | |
117 | snprintf(tmpfile, sizeof(tmpfile), | |
0e55181f | 118 | "%s/tmp_pack_XXXXXX", get_object_directory()); |
e42797f5 NP |
119 | output_fd = mkstemp(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)); | |
6d2fa7f1 | 125 | pack_fd = output_fd; |
e42797f5 NP |
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; | |
6d2fa7f1 | 132 | pack_fd = input_fd; |
e42797f5 | 133 | } |
2d477051 | 134 | SHA1_Init(&input_ctx); |
e42797f5 | 135 | return pack_name; |
9cf6d335 SV |
136 | } |
137 | ||
138 | static void parse_pack_header(void) | |
139 | { | |
2d477051 | 140 | struct pack_header *hdr = fill(sizeof(struct pack_header)); |
9cf6d335 SV |
141 | |
142 | /* Header consistency check */ | |
9cf6d335 | 143 | if (hdr->hdr_signature != htonl(PACK_SIGNATURE)) |
e42797f5 | 144 | die("pack signature mismatch"); |
d60fc1c8 | 145 | if (!pack_version_ok(hdr->hdr_version)) |
e42797f5 | 146 | die("pack version %d unsupported", ntohl(hdr->hdr_version)); |
9cf6d335 SV |
147 | |
148 | nr_objects = ntohl(hdr->hdr_entries); | |
2d477051 | 149 | use(sizeof(struct pack_header)); |
9cf6d335 SV |
150 | } |
151 | ||
152 | static void bad_object(unsigned long offset, const char *format, | |
153 | ...) NORETURN __attribute__((format (printf, 2, 3))); | |
154 | ||
155 | static void bad_object(unsigned long offset, const char *format, ...) | |
156 | { | |
157 | va_list params; | |
158 | char buf[1024]; | |
159 | ||
160 | va_start(params, format); | |
161 | vsnprintf(buf, sizeof(buf), format, params); | |
162 | va_end(params); | |
e42797f5 | 163 | die("pack has bad object at offset %lu: %s", offset, buf); |
9cf6d335 SV |
164 | } |
165 | ||
2d477051 | 166 | static void *unpack_entry_data(unsigned long offset, unsigned long size) |
9cf6d335 | 167 | { |
9cf6d335 SV |
168 | z_stream stream; |
169 | void *buf = xmalloc(size); | |
170 | ||
171 | memset(&stream, 0, sizeof(stream)); | |
172 | stream.next_out = buf; | |
173 | stream.avail_out = size; | |
2d477051 NP |
174 | stream.next_in = fill(1); |
175 | stream.avail_in = input_len; | |
9cf6d335 SV |
176 | inflateInit(&stream); |
177 | ||
178 | for (;;) { | |
179 | int ret = inflate(&stream, 0); | |
2d477051 NP |
180 | use(input_len - stream.avail_in); |
181 | if (stream.total_out == size && ret == Z_STREAM_END) | |
9cf6d335 SV |
182 | break; |
183 | if (ret != Z_OK) | |
184 | bad_object(offset, "inflate returned %d", ret); | |
2d477051 NP |
185 | stream.next_in = fill(1); |
186 | stream.avail_in = input_len; | |
9cf6d335 SV |
187 | } |
188 | inflateEnd(&stream); | |
9cf6d335 SV |
189 | return buf; |
190 | } | |
191 | ||
2d477051 | 192 | static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base) |
9cf6d335 | 193 | { |
2d477051 | 194 | unsigned char *p, c; |
d7dd0223 NP |
195 | unsigned long size; |
196 | off_t base_offset; | |
9cf6d335 | 197 | unsigned shift; |
ee5743ce | 198 | void *data; |
9cf6d335 | 199 | |
2d477051 | 200 | obj->offset = consumed_bytes; |
ee5743ce | 201 | input_crc32 = crc32(0, Z_NULL, 0); |
2d477051 NP |
202 | |
203 | p = fill(1); | |
204 | c = *p; | |
205 | use(1); | |
206 | obj->type = (c >> 4) & 7; | |
9cf6d335 SV |
207 | size = (c & 15); |
208 | shift = 4; | |
209 | while (c & 0x80) { | |
2d477051 NP |
210 | p = fill(1); |
211 | c = *p; | |
212 | use(1); | |
9cf6d335 SV |
213 | size += (c & 0x7fUL) << shift; |
214 | shift += 7; | |
215 | } | |
2d477051 | 216 | obj->size = size; |
9cf6d335 | 217 | |
2d477051 | 218 | switch (obj->type) { |
eb32d236 | 219 | case OBJ_REF_DELTA: |
2d477051 NP |
220 | hashcpy(delta_base->sha1, fill(20)); |
221 | use(20); | |
53dda6ff NP |
222 | break; |
223 | case OBJ_OFS_DELTA: | |
224 | memset(delta_base, 0, sizeof(*delta_base)); | |
2d477051 NP |
225 | p = fill(1); |
226 | c = *p; | |
227 | use(1); | |
53dda6ff NP |
228 | base_offset = c & 127; |
229 | while (c & 128) { | |
230 | base_offset += 1; | |
8723f216 | 231 | if (!base_offset || MSB(base_offset, 7)) |
2d477051 NP |
232 | bad_object(obj->offset, "offset value overflow for delta base object"); |
233 | p = fill(1); | |
234 | c = *p; | |
235 | use(1); | |
53dda6ff NP |
236 | base_offset = (base_offset << 7) + (c & 127); |
237 | } | |
2d477051 NP |
238 | delta_base->offset = obj->offset - base_offset; |
239 | if (delta_base->offset >= obj->offset) | |
240 | bad_object(obj->offset, "delta base offset is out of bound"); | |
53dda6ff | 241 | break; |
9cf6d335 SV |
242 | case OBJ_COMMIT: |
243 | case OBJ_TREE: | |
244 | case OBJ_BLOB: | |
245 | case OBJ_TAG: | |
9cf6d335 SV |
246 | break; |
247 | default: | |
08a19d87 | 248 | bad_object(obj->offset, "unknown object type %d", obj->type); |
9cf6d335 | 249 | } |
2d477051 NP |
250 | obj->hdr_size = consumed_bytes - obj->offset; |
251 | ||
ee5743ce NP |
252 | data = unpack_entry_data(obj->offset, obj->size); |
253 | obj->crc32 = input_crc32; | |
254 | return data; | |
2d477051 NP |
255 | } |
256 | ||
b89c4e93 | 257 | static void *get_data_from_pack(struct object_entry *obj) |
2d477051 NP |
258 | { |
259 | unsigned long from = obj[0].offset + obj[0].hdr_size; | |
260 | unsigned long len = obj[1].offset - from; | |
a91d49cd | 261 | unsigned long rdy = 0; |
6d2fa7f1 | 262 | unsigned char *src, *data; |
2d477051 NP |
263 | z_stream stream; |
264 | int st; | |
9cf6d335 | 265 | |
6d2fa7f1 | 266 | src = xmalloc(len); |
a91d49cd SP |
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); | |
2d477051 NP |
274 | data = xmalloc(obj->size); |
275 | memset(&stream, 0, sizeof(stream)); | |
276 | stream.next_out = data; | |
277 | stream.avail_out = obj->size; | |
6d2fa7f1 | 278 | stream.next_in = src; |
2d477051 NP |
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"); | |
6d2fa7f1 | 285 | free(src); |
9cf6d335 SV |
286 | return data; |
287 | } | |
288 | ||
53dda6ff | 289 | static int find_delta(const union delta_base *base) |
9cf6d335 SV |
290 | { |
291 | int first = 0, last = nr_deltas; | |
292 | ||
293 | while (first < last) { | |
294 | int next = (first + last) / 2; | |
295 | struct delta_entry *delta = &deltas[next]; | |
296 | int cmp; | |
297 | ||
3c552873 | 298 | cmp = memcmp(base, &delta->base, UNION_BASE_SZ); |
9cf6d335 SV |
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; | |
308 | } | |
309 | ||
b89c4e93 NP |
310 | static int find_delta_children(const union delta_base *base, |
311 | int *first_index, int *last_index) | |
9cf6d335 | 312 | { |
53dda6ff | 313 | int first = find_delta(base); |
9cf6d335 SV |
314 | int last = first; |
315 | int end = nr_deltas - 1; | |
316 | ||
317 | if (first < 0) | |
318 | return -1; | |
3c552873 | 319 | while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ)) |
9cf6d335 | 320 | --first; |
3c552873 | 321 | while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ)) |
9cf6d335 SV |
322 | ++last; |
323 | *first_index = first; | |
324 | *last_index = last; | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static void sha1_object(const void *data, unsigned long size, | |
9096c660 | 329 | enum object_type type, unsigned char *sha1) |
9cf6d335 | 330 | { |
ce9fbf16 | 331 | hash_sha1_file(data, size, typename(type), sha1); |
9096c660 | 332 | if (has_sha1_file(sha1)) { |
8685da42 NP |
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)); | |
bbf4b41b | 342 | free(has_data); |
8685da42 | 343 | } |
9cf6d335 SV |
344 | } |
345 | ||
636171cb | 346 | static void resolve_delta(struct object_entry *delta_obj, void *base_data, |
9cf6d335 SV |
347 | unsigned long base_size, enum object_type type) |
348 | { | |
9cf6d335 SV |
349 | void *delta_data; |
350 | unsigned long delta_size; | |
351 | void *result; | |
352 | unsigned long result_size; | |
53dda6ff | 353 | union delta_base delta_base; |
9cf6d335 SV |
354 | int j, first, last; |
355 | ||
636171cb NP |
356 | delta_obj->real_type = type; |
357 | delta_data = get_data_from_pack(delta_obj); | |
358 | delta_size = delta_obj->size; | |
9cf6d335 SV |
359 | result = patch_delta(base_data, base_size, delta_data, delta_size, |
360 | &result_size); | |
361 | free(delta_data); | |
362 | if (!result) | |
636171cb | 363 | bad_object(delta_obj->offset, "failed to apply delta"); |
9096c660 | 364 | sha1_object(result, result_size, type, delta_obj->sha1); |
636171cb | 365 | nr_resolved_deltas++; |
53dda6ff | 366 | |
636171cb | 367 | hashcpy(delta_base.sha1, delta_obj->sha1); |
b89c4e93 | 368 | if (!find_delta_children(&delta_base, &first, &last)) { |
636171cb NP |
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 | } | |
53dda6ff NP |
374 | } |
375 | ||
376 | memset(&delta_base, 0, sizeof(delta_base)); | |
636171cb | 377 | delta_base.offset = delta_obj->offset; |
b89c4e93 | 378 | if (!find_delta_children(&delta_base, &first, &last)) { |
636171cb NP |
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 | } | |
9cf6d335 | 384 | } |
53dda6ff | 385 | |
9cf6d335 SV |
386 | free(result); |
387 | } | |
388 | ||
389 | static int compare_delta_entry(const void *a, const void *b) | |
390 | { | |
391 | const struct delta_entry *delta_a = a; | |
392 | const struct delta_entry *delta_b = b; | |
3c552873 | 393 | return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ); |
9cf6d335 SV |
394 | } |
395 | ||
2d477051 NP |
396 | /* Parse all objects and return the pack content SHA1 hash */ |
397 | static void parse_pack_objects(unsigned char *sha1) | |
9cf6d335 | 398 | { |
96a02f8f | 399 | int i; |
53dda6ff | 400 | struct delta_entry *delta = deltas; |
9cf6d335 | 401 | void *data; |
2d477051 | 402 | struct stat st; |
9cf6d335 SV |
403 | |
404 | /* | |
405 | * First pass: | |
406 | * - find locations of all objects; | |
407 | * - calculate SHA1 of all non-delta objects; | |
b89c4e93 | 408 | * - remember base (SHA1 or offset) for all deltas. |
9cf6d335 | 409 | */ |
13aaf148 NP |
410 | if (verbose) |
411 | start_progress(&progress, "Indexing %u objects...", "", nr_objects); | |
9cf6d335 SV |
412 | for (i = 0; i < nr_objects; i++) { |
413 | struct object_entry *obj = &objects[i]; | |
2d477051 | 414 | data = unpack_raw_entry(obj, &delta->base); |
9cf6d335 | 415 | obj->real_type = obj->type; |
53dda6ff NP |
416 | if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) { |
417 | nr_deltas++; | |
636171cb | 418 | delta->obj_no = i; |
53dda6ff | 419 | delta++; |
9cf6d335 | 420 | } else |
9096c660 | 421 | sha1_object(data, obj->size, obj->type, obj->sha1); |
9cf6d335 | 422 | free(data); |
3c9af366 | 423 | if (verbose) |
96a02f8f | 424 | display_progress(&progress, i+1); |
9cf6d335 | 425 | } |
2d477051 | 426 | objects[i].offset = consumed_bytes; |
3c9af366 | 427 | if (verbose) |
96a02f8f | 428 | stop_progress(&progress); |
2d477051 NP |
429 | |
430 | /* Check pack integrity */ | |
636171cb | 431 | flush(); |
2d477051 NP |
432 | SHA1_Final(sha1, &input_ctx); |
433 | if (hashcmp(fill(20), sha1)) | |
e42797f5 | 434 | die("pack is corrupted (SHA1 mismatch)"); |
9bee2478 | 435 | use(20); |
2d477051 NP |
436 | |
437 | /* If input_fd is a file, we should have reached its end now. */ | |
438 | if (fstat(input_fd, &st)) | |
e42797f5 | 439 | die("cannot fstat packfile: %s", strerror(errno)); |
fa257b05 JS |
440 | if (S_ISREG(st.st_mode) && |
441 | lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size) | |
e42797f5 | 442 | die("pack has junk at the end"); |
9cf6d335 | 443 | |
3c9af366 NP |
444 | if (!nr_deltas) |
445 | return; | |
446 | ||
53dda6ff | 447 | /* Sort deltas by base SHA1/offset for fast searching */ |
9cf6d335 SV |
448 | qsort(deltas, nr_deltas, sizeof(struct delta_entry), |
449 | compare_delta_entry); | |
450 | ||
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 | */ | |
13aaf148 NP |
459 | if (verbose) |
460 | start_progress(&progress, "Resolving %u deltas...", "", nr_deltas); | |
9cf6d335 SV |
461 | for (i = 0; i < nr_objects; i++) { |
462 | struct object_entry *obj = &objects[i]; | |
53dda6ff NP |
463 | union delta_base base; |
464 | int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last; | |
9cf6d335 | 465 | |
53dda6ff | 466 | if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) |
9cf6d335 | 467 | continue; |
53dda6ff | 468 | hashcpy(base.sha1, obj->sha1); |
b89c4e93 | 469 | ref = !find_delta_children(&base, &ref_first, &ref_last); |
53dda6ff NP |
470 | memset(&base, 0, sizeof(base)); |
471 | base.offset = obj->offset; | |
b89c4e93 | 472 | ofs = !find_delta_children(&base, &ofs_first, &ofs_last); |
53dda6ff | 473 | if (!ref && !ofs) |
9cf6d335 | 474 | continue; |
2d477051 | 475 | data = get_data_from_pack(obj); |
53dda6ff | 476 | if (ref) |
636171cb NP |
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, | |
2d477051 | 481 | obj->size, obj->type); |
636171cb | 482 | } |
53dda6ff | 483 | if (ofs) |
636171cb NP |
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, | |
2d477051 | 488 | obj->size, obj->type); |
636171cb | 489 | } |
9cf6d335 | 490 | free(data); |
3c9af366 | 491 | if (verbose) |
96a02f8f | 492 | display_progress(&progress, nr_resolved_deltas); |
9cf6d335 | 493 | } |
636171cb NP |
494 | } |
495 | ||
ee5743ce | 496 | static int write_compressed(int fd, void *in, unsigned int size, uint32_t *obj_crc) |
636171cb NP |
497 | { |
498 | z_stream stream; | |
499 | unsigned long maxsize; | |
500 | void *out; | |
501 | ||
502 | memset(&stream, 0, sizeof(stream)); | |
503 | deflateInit(&stream, zlib_compression_level); | |
504 | maxsize = deflateBound(&stream, size); | |
505 | out = xmalloc(maxsize); | |
506 | ||
507 | /* Compress it */ | |
508 | stream.next_in = in; | |
509 | stream.avail_in = size; | |
510 | stream.next_out = out; | |
511 | stream.avail_out = maxsize; | |
512 | while (deflate(&stream, Z_FINISH) == Z_OK); | |
513 | deflateEnd(&stream); | |
514 | ||
515 | size = stream.total_out; | |
516 | write_or_die(fd, out, size); | |
ee5743ce | 517 | *obj_crc = crc32(*obj_crc, out, size); |
636171cb NP |
518 | free(out); |
519 | return size; | |
520 | } | |
521 | ||
9096c660 | 522 | static void append_obj_to_pack(const unsigned char *sha1, void *buf, |
636171cb NP |
523 | unsigned long size, enum object_type type) |
524 | { | |
525 | struct object_entry *obj = &objects[nr_objects++]; | |
526 | unsigned char header[10]; | |
527 | unsigned long s = size; | |
528 | int n = 0; | |
529 | unsigned char c = (type << 4) | (s & 15); | |
530 | s >>= 4; | |
531 | while (s) { | |
532 | header[n++] = c | 0x80; | |
533 | c = s & 0x7f; | |
534 | s >>= 7; | |
535 | } | |
536 | header[n++] = c; | |
537 | write_or_die(output_fd, header, n); | |
ee5743ce NP |
538 | obj[0].crc32 = crc32(0, Z_NULL, 0); |
539 | obj[0].crc32 = crc32(obj[0].crc32, header, n); | |
636171cb | 540 | obj[1].offset = obj[0].offset + n; |
ee5743ce | 541 | obj[1].offset += write_compressed(output_fd, buf, size, &obj[0].crc32); |
9096c660 | 542 | hashcpy(obj->sha1, sha1); |
636171cb NP |
543 | } |
544 | ||
545 | static int delta_pos_compare(const void *_a, const void *_b) | |
546 | { | |
547 | struct delta_entry *a = *(struct delta_entry **)_a; | |
548 | struct delta_entry *b = *(struct delta_entry **)_b; | |
549 | return a->obj_no - b->obj_no; | |
550 | } | |
9cf6d335 | 551 | |
636171cb NP |
552 | static void fix_unresolved_deltas(int nr_unresolved) |
553 | { | |
554 | struct delta_entry **sorted_by_pos; | |
96a02f8f | 555 | int i, n = 0; |
636171cb NP |
556 | |
557 | /* | |
558 | * Since many unresolved deltas may well be themselves base objects | |
559 | * for more unresolved deltas, we really want to include the | |
560 | * smallest number of base objects that would cover as much delta | |
561 | * as possible by picking the | |
562 | * trunc deltas first, allowing for other deltas to resolve without | |
563 | * additional base objects. Since most base objects are to be found | |
564 | * before deltas depending on them, a good heuristic is to start | |
565 | * resolving deltas in the same order as their position in the pack. | |
566 | */ | |
567 | sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos)); | |
9cf6d335 | 568 | for (i = 0; i < nr_deltas; i++) { |
636171cb NP |
569 | if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA) |
570 | continue; | |
571 | sorted_by_pos[n++] = &deltas[i]; | |
9cf6d335 | 572 | } |
636171cb NP |
573 | qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare); |
574 | ||
575 | for (i = 0; i < n; i++) { | |
576 | struct delta_entry *d = sorted_by_pos[i]; | |
577 | void *data; | |
578 | unsigned long size; | |
21666f1a | 579 | enum object_type type; |
636171cb NP |
580 | int j, first, last; |
581 | ||
582 | if (objects[d->obj_no].real_type != OBJ_REF_DELTA) | |
583 | continue; | |
21666f1a | 584 | data = read_sha1_file(d->base.sha1, &type, &size); |
636171cb NP |
585 | if (!data) |
586 | continue; | |
636171cb | 587 | |
b89c4e93 | 588 | find_delta_children(&d->base, &first, &last); |
636171cb NP |
589 | for (j = first; j <= last; j++) { |
590 | struct object_entry *child = objects + deltas[j].obj_no; | |
591 | if (child->real_type == OBJ_REF_DELTA) | |
21666f1a | 592 | resolve_delta(child, data, size, type); |
636171cb NP |
593 | } |
594 | ||
9096c660 NP |
595 | if (check_sha1_signature(d->base.sha1, data, size, typename(type))) |
596 | die("local object %s is corrupt", sha1_to_hex(d->base.sha1)); | |
597 | append_obj_to_pack(d->base.sha1, data, size, type); | |
636171cb | 598 | free(data); |
3c9af366 | 599 | if (verbose) |
96a02f8f | 600 | display_progress(&progress, nr_resolved_deltas); |
636171cb NP |
601 | } |
602 | free(sorted_by_pos); | |
603 | } | |
604 | ||
4ba7d711 NP |
605 | static uint32_t index_default_version = 1; |
606 | static uint32_t index_off32_limit = 0x7fffffff; | |
607 | ||
9cf6d335 SV |
608 | static int sha1_compare(const void *_a, const void *_b) |
609 | { | |
610 | struct object_entry *a = *(struct object_entry **)_a; | |
611 | struct object_entry *b = *(struct object_entry **)_b; | |
a89fccd2 | 612 | return hashcmp(a->sha1, b->sha1); |
9cf6d335 SV |
613 | } |
614 | ||
2d477051 NP |
615 | /* |
616 | * On entry *sha1 contains the pack content SHA1 hash, on exit it is | |
617 | * the SHA1 hash of sorted object names. | |
618 | */ | |
b89c4e93 | 619 | static const char *write_index_file(const char *index_name, unsigned char *sha1) |
9cf6d335 SV |
620 | { |
621 | struct sha1file *f; | |
7e4a2a84 | 622 | struct object_entry **sorted_by_sha, **list, **last; |
d1a46a9e | 623 | uint32_t array[256]; |
e42797f5 | 624 | int i, fd; |
84c8d8ae | 625 | SHA_CTX ctx; |
d1a46a9e | 626 | uint32_t index_version; |
9cf6d335 | 627 | |
7e4a2a84 JH |
628 | if (nr_objects) { |
629 | sorted_by_sha = | |
630 | xcalloc(nr_objects, sizeof(struct object_entry *)); | |
631 | list = sorted_by_sha; | |
632 | last = sorted_by_sha + nr_objects; | |
633 | for (i = 0; i < nr_objects; ++i) | |
634 | sorted_by_sha[i] = &objects[i]; | |
635 | qsort(sorted_by_sha, nr_objects, sizeof(sorted_by_sha[0]), | |
636 | sha1_compare); | |
7e4a2a84 JH |
637 | } |
638 | else | |
639 | sorted_by_sha = list = last = NULL; | |
9cf6d335 | 640 | |
e42797f5 NP |
641 | if (!index_name) { |
642 | static char tmpfile[PATH_MAX]; | |
643 | snprintf(tmpfile, sizeof(tmpfile), | |
0e55181f | 644 | "%s/tmp_idx_XXXXXX", get_object_directory()); |
e42797f5 NP |
645 | fd = mkstemp(tmpfile); |
646 | index_name = xstrdup(tmpfile); | |
647 | } else { | |
648 | unlink(index_name); | |
649 | fd = open(index_name, O_CREAT|O_EXCL|O_WRONLY, 0600); | |
650 | } | |
651 | if (fd < 0) | |
652 | die("unable to create %s: %s", index_name, strerror(errno)); | |
653 | f = sha1fd(fd, index_name); | |
9cf6d335 | 654 | |
d1a46a9e | 655 | /* if last object's offset is >= 2^31 we should use index V2 */ |
4ba7d711 | 656 | index_version = (objects[nr_objects-1].offset >> 31) ? 2 : index_default_version; |
d1a46a9e NP |
657 | |
658 | /* index versions 2 and above need a header */ | |
659 | if (index_version >= 2) { | |
660 | struct pack_idx_header hdr; | |
661 | hdr.idx_signature = htonl(PACK_IDX_SIGNATURE); | |
662 | hdr.idx_version = htonl(index_version); | |
663 | sha1write(f, &hdr, sizeof(hdr)); | |
664 | } | |
665 | ||
9cf6d335 SV |
666 | /* |
667 | * Write the first-level table (the list is sorted, | |
668 | * but we use a 256-entry lookup to be able to avoid | |
669 | * having to do eight extra binary search iterations). | |
670 | */ | |
671 | for (i = 0; i < 256; i++) { | |
672 | struct object_entry **next = list; | |
673 | while (next < last) { | |
674 | struct object_entry *obj = *next; | |
675 | if (obj->sha1[0] != i) | |
676 | break; | |
677 | next++; | |
678 | } | |
679 | array[i] = htonl(next - sorted_by_sha); | |
680 | list = next; | |
681 | } | |
d1a46a9e | 682 | sha1write(f, array, 256 * 4); |
9cf6d335 | 683 | |
d1a46a9e | 684 | /* compute the SHA1 hash of sorted object names. */ |
84c8d8ae | 685 | SHA1_Init(&ctx); |
d1a46a9e | 686 | |
9cf6d335 SV |
687 | /* |
688 | * Write the actual SHA1 entries.. | |
689 | */ | |
690 | list = sorted_by_sha; | |
691 | for (i = 0; i < nr_objects; i++) { | |
692 | struct object_entry *obj = *list++; | |
d1a46a9e NP |
693 | if (index_version < 2) { |
694 | uint32_t offset = htonl(obj->offset); | |
695 | sha1write(f, &offset, 4); | |
696 | } | |
9cf6d335 | 697 | sha1write(f, obj->sha1, 20); |
84c8d8ae | 698 | SHA1_Update(&ctx, obj->sha1, 20); |
9cf6d335 | 699 | } |
d1a46a9e NP |
700 | |
701 | if (index_version >= 2) { | |
702 | unsigned int nr_large_offset = 0; | |
703 | ||
704 | /* write the crc32 table */ | |
705 | list = sorted_by_sha; | |
706 | for (i = 0; i < nr_objects; i++) { | |
707 | struct object_entry *obj = *list++; | |
708 | uint32_t crc32_val = htonl(obj->crc32); | |
709 | sha1write(f, &crc32_val, 4); | |
710 | } | |
711 | ||
712 | /* write the 32-bit offset table */ | |
713 | list = sorted_by_sha; | |
714 | for (i = 0; i < nr_objects; i++) { | |
715 | struct object_entry *obj = *list++; | |
4ba7d711 | 716 | uint32_t offset = (obj->offset <= index_off32_limit) ? |
d1a46a9e NP |
717 | obj->offset : (0x80000000 | nr_large_offset++); |
718 | offset = htonl(offset); | |
719 | sha1write(f, &offset, 4); | |
720 | } | |
721 | ||
722 | /* write the large offset table */ | |
723 | list = sorted_by_sha; | |
724 | while (nr_large_offset) { | |
725 | struct object_entry *obj = *list++; | |
726 | uint64_t offset = obj->offset; | |
4ba7d711 | 727 | if (offset > index_off32_limit) { |
d1a46a9e NP |
728 | uint32_t split[2]; |
729 | split[0] = htonl(offset >> 32); | |
730 | split[1] = htonl(offset & 0xffffffff); | |
731 | sha1write(f, split, 8); | |
732 | nr_large_offset--; | |
733 | } | |
734 | } | |
735 | } | |
736 | ||
2d477051 | 737 | sha1write(f, sha1, 20); |
9cf6d335 SV |
738 | sha1close(f, NULL, 1); |
739 | free(sorted_by_sha); | |
84c8d8ae | 740 | SHA1_Final(sha1, &ctx); |
e42797f5 NP |
741 | return index_name; |
742 | } | |
743 | ||
744 | static void final(const char *final_pack_name, const char *curr_pack_name, | |
745 | const char *final_index_name, const char *curr_index_name, | |
b8077709 | 746 | const char *keep_name, const char *keep_msg, |
e42797f5 NP |
747 | unsigned char *sha1) |
748 | { | |
3a55602e | 749 | const char *report = "pack"; |
e42797f5 NP |
750 | char name[PATH_MAX]; |
751 | int err; | |
752 | ||
753 | if (!from_stdin) { | |
754 | close(input_fd); | |
755 | } else { | |
756 | err = close(output_fd); | |
757 | if (err) | |
758 | die("error while closing pack file: %s", strerror(errno)); | |
759 | chmod(curr_pack_name, 0444); | |
760 | } | |
761 | ||
b8077709 SP |
762 | if (keep_msg) { |
763 | int keep_fd, keep_msg_len = strlen(keep_msg); | |
764 | if (!keep_name) { | |
765 | snprintf(name, sizeof(name), "%s/pack/pack-%s.keep", | |
766 | get_object_directory(), sha1_to_hex(sha1)); | |
767 | keep_name = name; | |
768 | } | |
9ca4a201 NP |
769 | keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600); |
770 | if (keep_fd < 0) { | |
771 | if (errno != EEXIST) | |
772 | die("cannot write keep file"); | |
773 | } else { | |
774 | if (keep_msg_len > 0) { | |
775 | write_or_die(keep_fd, keep_msg, keep_msg_len); | |
776 | write_or_die(keep_fd, "\n", 1); | |
777 | } | |
778 | close(keep_fd); | |
576162a4 | 779 | report = "keep"; |
b8077709 | 780 | } |
b8077709 SP |
781 | } |
782 | ||
e42797f5 NP |
783 | if (final_pack_name != curr_pack_name) { |
784 | if (!final_pack_name) { | |
785 | snprintf(name, sizeof(name), "%s/pack/pack-%s.pack", | |
786 | get_object_directory(), sha1_to_hex(sha1)); | |
787 | final_pack_name = name; | |
788 | } | |
789 | if (move_temp_to_file(curr_pack_name, final_pack_name)) | |
790 | die("cannot store pack file"); | |
791 | } | |
792 | ||
793 | chmod(curr_index_name, 0444); | |
794 | if (final_index_name != curr_index_name) { | |
795 | if (!final_index_name) { | |
796 | snprintf(name, sizeof(name), "%s/pack/pack-%s.idx", | |
797 | get_object_directory(), sha1_to_hex(sha1)); | |
798 | final_index_name = name; | |
799 | } | |
800 | if (move_temp_to_file(curr_index_name, final_index_name)) | |
801 | die("cannot store index file"); | |
802 | } | |
576162a4 NP |
803 | |
804 | if (!from_stdin) { | |
805 | printf("%s\n", sha1_to_hex(sha1)); | |
806 | } else { | |
807 | char buf[48]; | |
808 | int len = snprintf(buf, sizeof(buf), "%s\t%s\n", | |
809 | report, sha1_to_hex(sha1)); | |
d1b2ddc8 | 810 | write_or_die(1, buf, len); |
576162a4 NP |
811 | |
812 | /* | |
813 | * Let's just mimic git-unpack-objects here and write | |
814 | * the last part of the input buffer to stdout. | |
815 | */ | |
816 | while (input_len) { | |
817 | err = xwrite(1, input_buffer + input_offset, input_len); | |
818 | if (err <= 0) | |
819 | break; | |
820 | input_len -= err; | |
821 | input_offset += err; | |
822 | } | |
823 | } | |
9cf6d335 SV |
824 | } |
825 | ||
826 | int main(int argc, char **argv) | |
827 | { | |
636171cb | 828 | int i, fix_thin_pack = 0; |
e42797f5 NP |
829 | const char *curr_pack, *pack_name = NULL; |
830 | const char *curr_index, *index_name = NULL; | |
b8077709 SP |
831 | const char *keep_name = NULL, *keep_msg = NULL; |
832 | char *index_name_buf = NULL, *keep_name_buf = NULL; | |
84c8d8ae | 833 | unsigned char sha1[20]; |
9cf6d335 SV |
834 | |
835 | for (i = 1; i < argc; i++) { | |
836 | const char *arg = argv[i]; | |
837 | ||
838 | if (*arg == '-') { | |
e42797f5 NP |
839 | if (!strcmp(arg, "--stdin")) { |
840 | from_stdin = 1; | |
636171cb NP |
841 | } else if (!strcmp(arg, "--fix-thin")) { |
842 | fix_thin_pack = 1; | |
b8077709 SP |
843 | } else if (!strcmp(arg, "--keep")) { |
844 | keep_msg = ""; | |
cc44c765 | 845 | } else if (!prefixcmp(arg, "--keep=")) { |
b8077709 | 846 | keep_msg = arg + 7; |
cc44c765 | 847 | } else if (!prefixcmp(arg, "--pack_header=")) { |
bed006fb NP |
848 | struct pack_header *hdr; |
849 | char *c; | |
850 | ||
851 | hdr = (struct pack_header *)input_buffer; | |
852 | hdr->hdr_signature = htonl(PACK_SIGNATURE); | |
853 | hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10)); | |
854 | if (*c != ',') | |
855 | die("bad %s", arg); | |
856 | hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10)); | |
857 | if (*c) | |
858 | die("bad %s", arg); | |
859 | input_len = sizeof(*hdr); | |
3c9af366 NP |
860 | } else if (!strcmp(arg, "-v")) { |
861 | verbose = 1; | |
e42797f5 | 862 | } else if (!strcmp(arg, "-o")) { |
9cf6d335 SV |
863 | if (index_name || (i+1) >= argc) |
864 | usage(index_pack_usage); | |
865 | index_name = argv[++i]; | |
4ba7d711 NP |
866 | } else if (!prefixcmp(arg, "--index-version=")) { |
867 | char *c; | |
868 | index_default_version = strtoul(arg + 16, &c, 10); | |
869 | if (index_default_version > 2) | |
870 | die("bad %s", arg); | |
871 | if (*c == ',') | |
872 | index_off32_limit = strtoul(c+1, &c, 0); | |
873 | if (*c || index_off32_limit & 0x80000000) | |
874 | die("bad %s", arg); | |
9cf6d335 SV |
875 | } else |
876 | usage(index_pack_usage); | |
877 | continue; | |
878 | } | |
879 | ||
880 | if (pack_name) | |
881 | usage(index_pack_usage); | |
882 | pack_name = arg; | |
883 | } | |
884 | ||
e42797f5 | 885 | if (!pack_name && !from_stdin) |
9cf6d335 | 886 | usage(index_pack_usage); |
636171cb NP |
887 | if (fix_thin_pack && !from_stdin) |
888 | die("--fix-thin cannot be used without --stdin"); | |
e42797f5 | 889 | if (!index_name && pack_name) { |
9cf6d335 | 890 | int len = strlen(pack_name); |
5bb1cda5 | 891 | if (!has_extension(pack_name, ".pack")) |
9cf6d335 SV |
892 | die("packfile name '%s' does not end with '.pack'", |
893 | pack_name); | |
6689f087 | 894 | index_name_buf = xmalloc(len); |
9cf6d335 SV |
895 | memcpy(index_name_buf, pack_name, len - 5); |
896 | strcpy(index_name_buf + len - 5, ".idx"); | |
897 | index_name = index_name_buf; | |
898 | } | |
b8077709 SP |
899 | if (keep_msg && !keep_name && pack_name) { |
900 | int len = strlen(pack_name); | |
901 | if (!has_extension(pack_name, ".pack")) | |
902 | die("packfile name '%s' does not end with '.pack'", | |
903 | pack_name); | |
904 | keep_name_buf = xmalloc(len); | |
905 | memcpy(keep_name_buf, pack_name, len - 5); | |
906 | strcpy(keep_name_buf + len - 5, ".keep"); | |
907 | keep_name = keep_name_buf; | |
908 | } | |
9cf6d335 | 909 | |
e42797f5 | 910 | curr_pack = open_pack_file(pack_name); |
9cf6d335 | 911 | parse_pack_header(); |
636171cb NP |
912 | objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry)); |
913 | deltas = xmalloc(nr_objects * sizeof(struct delta_entry)); | |
2d477051 | 914 | parse_pack_objects(sha1); |
96a02f8f NP |
915 | if (nr_deltas == nr_resolved_deltas) { |
916 | if (verbose) | |
917 | stop_progress(&progress); | |
918 | /* Flush remaining pack final 20-byte SHA1. */ | |
919 | flush(); | |
920 | } else { | |
636171cb NP |
921 | if (fix_thin_pack) { |
922 | int nr_unresolved = nr_deltas - nr_resolved_deltas; | |
3c9af366 | 923 | int nr_objects_initial = nr_objects; |
636171cb NP |
924 | if (nr_unresolved <= 0) |
925 | die("confusion beyond insanity"); | |
926 | objects = xrealloc(objects, | |
927 | (nr_objects + nr_unresolved + 1) | |
928 | * sizeof(*objects)); | |
929 | fix_unresolved_deltas(nr_unresolved); | |
96a02f8f NP |
930 | if (verbose) { |
931 | stop_progress(&progress); | |
3c9af366 NP |
932 | fprintf(stderr, "%d objects were added to complete this thin pack.\n", |
933 | nr_objects - nr_objects_initial); | |
96a02f8f | 934 | } |
cbc6bdab SP |
935 | fixup_pack_header_footer(output_fd, sha1, |
936 | curr_pack, nr_objects); | |
636171cb NP |
937 | } |
938 | if (nr_deltas != nr_resolved_deltas) | |
939 | die("pack has %d unresolved deltas", | |
940 | nr_deltas - nr_resolved_deltas); | |
636171cb | 941 | } |
9cf6d335 | 942 | free(deltas); |
e42797f5 | 943 | curr_index = write_index_file(index_name, sha1); |
b8077709 SP |
944 | final(pack_name, curr_pack, |
945 | index_name, curr_index, | |
946 | keep_name, keep_msg, | |
947 | sha1); | |
9cf6d335 SV |
948 | free(objects); |
949 | free(index_name_buf); | |
b8077709 | 950 | free(keep_name_buf); |
9cf6d335 SV |
951 | |
952 | return 0; | |
953 | } |