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