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Commit | Line | Data |
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64413630 | 1 | #include "builtin.h" |
bad50dc8 | 2 | #include "cache.h" |
74536958 | 3 | #include "object.h" |
8ee378a0 | 4 | #include "delta.h" |
a733cb60 | 5 | #include "pack.h" |
8e440259 PE |
6 | #include "blob.h" |
7 | #include "commit.h" | |
8 | #include "tag.h" | |
9 | #include "tree.h" | |
96a02f8f | 10 | #include "progress.h" |
2add1e6d | 11 | #include "decorate.h" |
bad50dc8 | 12 | |
c95b3ad9 JH |
13 | static int dry_run, quiet, recover, has_errors; |
14 | static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] < pack-file"; | |
bad50dc8 | 15 | |
67e5a5ec LT |
16 | /* We always read in 4kB chunks. */ |
17 | static unsigned char buffer[4096]; | |
d7dd0223 NP |
18 | static unsigned int offset, len; |
19 | static off_t consumed_bytes; | |
67e5a5ec | 20 | static SHA_CTX ctx; |
bad50dc8 | 21 | |
2add1e6d MK |
22 | struct obj_buffer { |
23 | char *buffer; | |
24 | unsigned long size; | |
25 | }; | |
26 | ||
27 | static struct decoration obj_decorate; | |
28 | ||
29 | static struct obj_buffer *lookup_object_buffer(struct object *base) | |
30 | { | |
31 | return lookup_decoration(&obj_decorate, base); | |
32 | } | |
33 | ||
67e5a5ec LT |
34 | /* |
35 | * Make sure at least "min" bytes are available in the buffer, and | |
36 | * return the pointer to the buffer. | |
37 | */ | |
79a65697 | 38 | static void *fill(int min) |
67e5a5ec LT |
39 | { |
40 | if (min <= len) | |
41 | return buffer + offset; | |
67e5a5ec LT |
42 | if (min > sizeof(buffer)) |
43 | die("cannot fill %d bytes", min); | |
44 | if (offset) { | |
45 | SHA1_Update(&ctx, buffer, offset); | |
79a65697 | 46 | memmove(buffer, buffer + offset, len); |
67e5a5ec LT |
47 | offset = 0; |
48 | } | |
49 | do { | |
8a912bcb | 50 | ssize_t ret = xread(0, buffer + len, sizeof(buffer) - len); |
67e5a5ec LT |
51 | if (ret <= 0) { |
52 | if (!ret) | |
53 | die("early EOF"); | |
67e5a5ec LT |
54 | die("read error on input: %s", strerror(errno)); |
55 | } | |
56 | len += ret; | |
57 | } while (len < min); | |
58 | return buffer; | |
59 | } | |
74536958 | 60 | |
67e5a5ec LT |
61 | static void use(int bytes) |
62 | { | |
63 | if (bytes > len) | |
64 | die("used more bytes than were available"); | |
65 | len -= bytes; | |
66 | offset += bytes; | |
d7dd0223 NP |
67 | |
68 | /* make sure off_t is sufficiently large not to wrap */ | |
69 | if (consumed_bytes > consumed_bytes + bytes) | |
70 | die("pack too large for current definition of off_t"); | |
209c554a | 71 | consumed_bytes += bytes; |
67e5a5ec | 72 | } |
bad50dc8 | 73 | |
67e5a5ec | 74 | static void *get_data(unsigned long size) |
bad50dc8 | 75 | { |
67e5a5ec LT |
76 | z_stream stream; |
77 | void *buf = xmalloc(size); | |
78 | ||
67e5a5ec LT |
79 | memset(&stream, 0, sizeof(stream)); |
80 | ||
81 | stream.next_out = buf; | |
82 | stream.avail_out = size; | |
83 | stream.next_in = fill(1); | |
84 | stream.avail_in = len; | |
85 | inflateInit(&stream); | |
86 | ||
87 | for (;;) { | |
88 | int ret = inflate(&stream, 0); | |
89 | use(len - stream.avail_in); | |
90 | if (stream.total_out == size && ret == Z_STREAM_END) | |
91 | break; | |
f986f2c8 JH |
92 | if (ret != Z_OK) { |
93 | error("inflate returned %d\n", ret); | |
94 | free(buf); | |
95 | buf = NULL; | |
3b67d291 | 96 | if (!recover) |
f986f2c8 JH |
97 | exit(1); |
98 | has_errors = 1; | |
99 | break; | |
100 | } | |
67e5a5ec LT |
101 | stream.next_in = fill(1); |
102 | stream.avail_in = len; | |
103 | } | |
ee639140 | 104 | inflateEnd(&stream); |
67e5a5ec | 105 | return buf; |
bad50dc8 LT |
106 | } |
107 | ||
67e5a5ec LT |
108 | struct delta_info { |
109 | unsigned char base_sha1[20]; | |
d7dd0223 NP |
110 | unsigned nr; |
111 | off_t base_offset; | |
67e5a5ec LT |
112 | unsigned long size; |
113 | void *delta; | |
114 | struct delta_info *next; | |
115 | }; | |
116 | ||
117 | static struct delta_info *delta_list; | |
118 | ||
209c554a | 119 | static void add_delta_to_list(unsigned nr, unsigned const char *base_sha1, |
d7dd0223 | 120 | off_t base_offset, |
209c554a | 121 | void *delta, unsigned long size) |
bad50dc8 | 122 | { |
67e5a5ec | 123 | struct delta_info *info = xmalloc(sizeof(*info)); |
bad50dc8 | 124 | |
e702496e | 125 | hashcpy(info->base_sha1, base_sha1); |
209c554a | 126 | info->base_offset = base_offset; |
67e5a5ec LT |
127 | info->size = size; |
128 | info->delta = delta; | |
209c554a | 129 | info->nr = nr; |
67e5a5ec LT |
130 | info->next = delta_list; |
131 | delta_list = info; | |
bad50dc8 LT |
132 | } |
133 | ||
209c554a | 134 | struct obj_info { |
d7dd0223 | 135 | off_t offset; |
209c554a NP |
136 | unsigned char sha1[20]; |
137 | }; | |
138 | ||
139 | static struct obj_info *obj_list; | |
67e5a5ec | 140 | |
21666f1a NP |
141 | static void added_object(unsigned nr, enum object_type type, |
142 | void *data, unsigned long size); | |
209c554a | 143 | |
21666f1a NP |
144 | static void write_object(unsigned nr, enum object_type type, |
145 | void *buf, unsigned long size) | |
cca7081a | 146 | { |
c95b3ad9 JH |
147 | if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0) |
148 | die("failed to write object"); | |
209c554a | 149 | added_object(nr, type, buf, size); |
cca7081a LT |
150 | } |
151 | ||
21666f1a | 152 | static void resolve_delta(unsigned nr, enum object_type type, |
f986f2c8 JH |
153 | void *base, unsigned long base_size, |
154 | void *delta, unsigned long delta_size) | |
bad50dc8 | 155 | { |
67e5a5ec LT |
156 | void *result; |
157 | unsigned long result_size; | |
bad50dc8 | 158 | |
67e5a5ec LT |
159 | result = patch_delta(base, base_size, |
160 | delta, delta_size, | |
161 | &result_size); | |
162 | if (!result) | |
163 | die("failed to apply delta"); | |
164 | free(delta); | |
21666f1a | 165 | write_object(nr, type, result, result_size); |
c95b3ad9 | 166 | free(result); |
bad50dc8 LT |
167 | } |
168 | ||
21666f1a NP |
169 | static void added_object(unsigned nr, enum object_type type, |
170 | void *data, unsigned long size) | |
74536958 | 171 | { |
67e5a5ec LT |
172 | struct delta_info **p = &delta_list; |
173 | struct delta_info *info; | |
174 | ||
175 | while ((info = *p) != NULL) { | |
209c554a NP |
176 | if (!hashcmp(info->base_sha1, obj_list[nr].sha1) || |
177 | info->base_offset == obj_list[nr].offset) { | |
67e5a5ec LT |
178 | *p = info->next; |
179 | p = &delta_list; | |
209c554a NP |
180 | resolve_delta(info->nr, type, data, size, |
181 | info->delta, info->size); | |
67e5a5ec LT |
182 | free(info); |
183 | continue; | |
184 | } | |
185 | p = &info->next; | |
186 | } | |
187 | } | |
188 | ||
21666f1a | 189 | static void unpack_non_delta_entry(enum object_type type, unsigned long size, |
209c554a | 190 | unsigned nr) |
67e5a5ec LT |
191 | { |
192 | void *buf = get_data(size); | |
8ee378a0 | 193 | |
f986f2c8 | 194 | if (!dry_run && buf) |
21666f1a | 195 | write_object(nr, type, buf, size); |
c95b3ad9 | 196 | free(buf); |
8ee378a0 JH |
197 | } |
198 | ||
21666f1a | 199 | static void unpack_delta_entry(enum object_type type, unsigned long delta_size, |
209c554a | 200 | unsigned nr) |
8ee378a0 | 201 | { |
67e5a5ec LT |
202 | void *delta_data, *base; |
203 | unsigned long base_size; | |
67e5a5ec | 204 | unsigned char base_sha1[20]; |
2add1e6d | 205 | struct object *obj; |
8ee378a0 | 206 | |
21666f1a | 207 | if (type == OBJ_REF_DELTA) { |
209c554a NP |
208 | hashcpy(base_sha1, fill(20)); |
209 | use(20); | |
210 | delta_data = get_data(delta_size); | |
211 | if (dry_run || !delta_data) { | |
212 | free(delta_data); | |
213 | return; | |
214 | } | |
215 | if (!has_sha1_file(base_sha1)) { | |
216 | hashcpy(obj_list[nr].sha1, null_sha1); | |
217 | add_delta_to_list(nr, base_sha1, 0, delta_data, delta_size); | |
218 | return; | |
219 | } | |
220 | } else { | |
221 | unsigned base_found = 0; | |
222 | unsigned char *pack, c; | |
d7dd0223 | 223 | off_t base_offset; |
209c554a | 224 | unsigned lo, mid, hi; |
c4fb06c0 | 225 | |
209c554a NP |
226 | pack = fill(1); |
227 | c = *pack; | |
228 | use(1); | |
229 | base_offset = c & 127; | |
230 | while (c & 128) { | |
231 | base_offset += 1; | |
8723f216 | 232 | if (!base_offset || MSB(base_offset, 7)) |
209c554a NP |
233 | die("offset value overflow for delta base object"); |
234 | pack = fill(1); | |
235 | c = *pack; | |
236 | use(1); | |
237 | base_offset = (base_offset << 7) + (c & 127); | |
238 | } | |
239 | base_offset = obj_list[nr].offset - base_offset; | |
8ee378a0 | 240 | |
209c554a NP |
241 | delta_data = get_data(delta_size); |
242 | if (dry_run || !delta_data) { | |
243 | free(delta_data); | |
244 | return; | |
245 | } | |
246 | lo = 0; | |
247 | hi = nr; | |
248 | while (lo < hi) { | |
249 | mid = (lo + hi)/2; | |
250 | if (base_offset < obj_list[mid].offset) { | |
251 | hi = mid; | |
252 | } else if (base_offset > obj_list[mid].offset) { | |
253 | lo = mid + 1; | |
254 | } else { | |
255 | hashcpy(base_sha1, obj_list[mid].sha1); | |
256 | base_found = !is_null_sha1(base_sha1); | |
257 | break; | |
258 | } | |
259 | } | |
260 | if (!base_found) { | |
261 | /* The delta base object is itself a delta that | |
262 | has not been resolved yet. */ | |
263 | hashcpy(obj_list[nr].sha1, null_sha1); | |
264 | add_delta_to_list(nr, null_sha1, base_offset, delta_data, delta_size); | |
265 | return; | |
2add1e6d MK |
266 | } |
267 | } | |
268 | ||
269 | obj = lookup_object(base_sha1); | |
270 | if (obj) { | |
271 | struct obj_buffer *obj_buf = lookup_object_buffer(obj); | |
272 | if (obj_buf) { | |
273 | resolve_delta(nr, obj->type, obj_buf->buffer, obj_buf->size, delta_data, delta_size); | |
274 | return; | |
209c554a | 275 | } |
8ee378a0 | 276 | } |
209c554a | 277 | |
21666f1a | 278 | base = read_sha1_file(base_sha1, &type, &base_size); |
f986f2c8 JH |
279 | if (!base) { |
280 | error("failed to read delta-pack base object %s", | |
281 | sha1_to_hex(base_sha1)); | |
3b67d291 | 282 | if (!recover) |
f986f2c8 JH |
283 | exit(1); |
284 | has_errors = 1; | |
285 | return; | |
286 | } | |
209c554a | 287 | resolve_delta(nr, type, base, base_size, delta_data, delta_size); |
ee639140 | 288 | free(base); |
8ee378a0 JH |
289 | } |
290 | ||
96a02f8f | 291 | static void unpack_one(unsigned nr) |
8ee378a0 | 292 | { |
01247d87 | 293 | unsigned shift; |
a733cb60 | 294 | unsigned char *pack, c; |
67e5a5ec LT |
295 | unsigned long size; |
296 | enum object_type type; | |
74536958 | 297 | |
209c554a NP |
298 | obj_list[nr].offset = consumed_bytes; |
299 | ||
67e5a5ec LT |
300 | pack = fill(1); |
301 | c = *pack; | |
302 | use(1); | |
a733cb60 LT |
303 | type = (c >> 4) & 7; |
304 | size = (c & 15); | |
01247d87 | 305 | shift = 4; |
a733cb60 | 306 | while (c & 0x80) { |
67e5a5ec | 307 | pack = fill(1); |
209c554a | 308 | c = *pack; |
67e5a5ec | 309 | use(1); |
01247d87 LT |
310 | size += (c & 0x7f) << shift; |
311 | shift += 7; | |
a733cb60 | 312 | } |
96a02f8f | 313 | |
a733cb60 LT |
314 | switch (type) { |
315 | case OBJ_COMMIT: | |
316 | case OBJ_TREE: | |
317 | case OBJ_BLOB: | |
318 | case OBJ_TAG: | |
209c554a | 319 | unpack_non_delta_entry(type, size, nr); |
a733cb60 | 320 | return; |
eb32d236 | 321 | case OBJ_REF_DELTA: |
209c554a NP |
322 | case OBJ_OFS_DELTA: |
323 | unpack_delta_entry(type, size, nr); | |
a733cb60 | 324 | return; |
67e5a5ec | 325 | default: |
f986f2c8 JH |
326 | error("bad object type %d", type); |
327 | has_errors = 1; | |
3b67d291 | 328 | if (recover) |
f986f2c8 JH |
329 | return; |
330 | exit(1); | |
74536958 LT |
331 | } |
332 | } | |
333 | ||
74536958 LT |
334 | static void unpack_all(void) |
335 | { | |
67e5a5ec | 336 | int i; |
dc6a0757 | 337 | struct progress *progress = NULL; |
67e5a5ec | 338 | struct pack_header *hdr = fill(sizeof(struct pack_header)); |
c95b3ad9 | 339 | unsigned nr_objects = ntohl(hdr->hdr_entries); |
67e5a5ec LT |
340 | |
341 | if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE) | |
342 | die("bad pack file"); | |
d60fc1c8 NP |
343 | if (!pack_version_ok(hdr->hdr_version)) |
344 | die("unknown pack file version %d", ntohl(hdr->hdr_version)); | |
96a02f8f | 345 | use(sizeof(struct pack_header)); |
67e5a5ec | 346 | |
13aaf148 | 347 | if (!quiet) |
dc6a0757 | 348 | progress = start_progress("Unpacking objects", nr_objects); |
209c554a | 349 | obj_list = xmalloc(nr_objects * sizeof(*obj_list)); |
96a02f8f NP |
350 | for (i = 0; i < nr_objects; i++) { |
351 | unpack_one(i); | |
4d4fcc54 | 352 | display_progress(progress, i + 1); |
96a02f8f | 353 | } |
4d4fcc54 | 354 | stop_progress(&progress); |
96a02f8f | 355 | |
67e5a5ec LT |
356 | if (delta_list) |
357 | die("unresolved deltas left after unpacking"); | |
74536958 LT |
358 | } |
359 | ||
64413630 | 360 | int cmd_unpack_objects(int argc, const char **argv, const char *prefix) |
bad50dc8 LT |
361 | { |
362 | int i; | |
67e5a5ec | 363 | unsigned char sha1[20]; |
bad50dc8 | 364 | |
8e273641 | 365 | git_config(git_default_config); |
53228a5f | 366 | |
476e8011 JH |
367 | quiet = !isatty(2); |
368 | ||
bad50dc8 LT |
369 | for (i = 1 ; i < argc; i++) { |
370 | const char *arg = argv[i]; | |
371 | ||
372 | if (*arg == '-') { | |
74536958 LT |
373 | if (!strcmp(arg, "-n")) { |
374 | dry_run = 1; | |
375 | continue; | |
376 | } | |
d36f7b80 LT |
377 | if (!strcmp(arg, "-q")) { |
378 | quiet = 1; | |
379 | continue; | |
380 | } | |
f986f2c8 | 381 | if (!strcmp(arg, "-r")) { |
3b67d291 | 382 | recover = 1; |
f986f2c8 JH |
383 | continue; |
384 | } | |
cc44c765 | 385 | if (!prefixcmp(arg, "--pack_header=")) { |
bed006fb NP |
386 | struct pack_header *hdr; |
387 | char *c; | |
388 | ||
389 | hdr = (struct pack_header *)buffer; | |
390 | hdr->hdr_signature = htonl(PACK_SIGNATURE); | |
391 | hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10)); | |
392 | if (*c != ',') | |
393 | die("bad %s", arg); | |
394 | hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10)); | |
395 | if (*c) | |
396 | die("bad %s", arg); | |
397 | len = sizeof(*hdr); | |
398 | continue; | |
399 | } | |
bad50dc8 LT |
400 | usage(unpack_usage); |
401 | } | |
67e5a5ec LT |
402 | |
403 | /* We don't take any non-flag arguments now.. Maybe some day */ | |
bad50dc8 | 404 | usage(unpack_usage); |
67e5a5ec LT |
405 | } |
406 | SHA1_Init(&ctx); | |
74536958 | 407 | unpack_all(); |
67e5a5ec LT |
408 | SHA1_Update(&ctx, buffer, offset); |
409 | SHA1_Final(sha1, &ctx); | |
a89fccd2 | 410 | if (hashcmp(fill(20), sha1)) |
67e5a5ec LT |
411 | die("final sha1 did not match"); |
412 | use(20); | |
413 | ||
414 | /* Write the last part of the buffer to stdout */ | |
415 | while (len) { | |
1c15afb9 JH |
416 | int ret = xwrite(1, buffer + offset, len); |
417 | if (ret <= 0) | |
67e5a5ec | 418 | break; |
67e5a5ec LT |
419 | len -= ret; |
420 | offset += ret; | |
421 | } | |
422 | ||
423 | /* All done */ | |
f986f2c8 | 424 | return has_errors; |
bad50dc8 | 425 | } |