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