]>
Commit | Line | Data |
---|---|---|
0fcfd160 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * | |
6 | * This handles basic git sha1 object files - packing, unpacking, | |
7 | * creation etc. | |
8 | */ | |
0fcfd160 | 9 | #include "cache.h" |
1f688557 | 10 | #include "delta.h" |
a733cb60 | 11 | #include "pack.h" |
8e440259 PE |
12 | #include "blob.h" |
13 | #include "commit.h" | |
14 | #include "tag.h" | |
15 | #include "tree.h" | |
0fcfd160 | 16 | |
144bde78 LT |
17 | #ifndef O_NOATIME |
18 | #if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) | |
19 | #define O_NOATIME 01000000 | |
20 | #else | |
21 | #define O_NOATIME 0 | |
22 | #endif | |
23 | #endif | |
24 | ||
e05db0fd PR |
25 | #ifdef NO_C99_FORMAT |
26 | #define SZ_FMT "lu" | |
27 | #else | |
28 | #define SZ_FMT "zu" | |
29 | #endif | |
30 | ||
96f1e58f | 31 | const unsigned char null_sha1[20]; |
88cd621d | 32 | |
144bde78 LT |
33 | static unsigned int sha1_file_open_flag = O_NOATIME; |
34 | ||
e49521b5 JH |
35 | signed char hexval_table[256] = { |
36 | -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */ | |
37 | -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */ | |
38 | -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */ | |
39 | -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */ | |
40 | -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */ | |
41 | -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */ | |
42 | 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */ | |
43 | 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */ | |
44 | -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */ | |
45 | -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */ | |
46 | -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */ | |
47 | -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */ | |
48 | -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */ | |
49 | -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */ | |
50 | -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */ | |
51 | -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */ | |
52 | -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */ | |
53 | -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */ | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */ | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */ | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */ | |
58 | -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */ | |
59 | -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */ | |
60 | -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */ | |
61 | -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */ | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */ | |
63 | -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */ | |
64 | -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */ | |
65 | -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */ | |
66 | -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */ | |
67 | -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */ | |
68 | }; | |
0fcfd160 LT |
69 | |
70 | int get_sha1_hex(const char *hex, unsigned char *sha1) | |
71 | { | |
72 | int i; | |
73 | for (i = 0; i < 20; i++) { | |
74 | unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); | |
75 | if (val & ~0xff) | |
76 | return -1; | |
77 | *sha1++ = val; | |
78 | hex += 2; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
b2cb9425 JH |
83 | int safe_create_leading_directories(char *path) |
84 | { | |
85 | char *pos = path; | |
67d42212 JR |
86 | struct stat st; |
87 | ||
67ffdf4c JS |
88 | if (*pos == '/') |
89 | pos++; | |
b2cb9425 JH |
90 | |
91 | while (pos) { | |
92 | pos = strchr(pos, '/'); | |
93 | if (!pos) | |
94 | break; | |
95 | *pos = 0; | |
67d42212 JR |
96 | if (!stat(path, &st)) { |
97 | /* path exists */ | |
98 | if (!S_ISDIR(st.st_mode)) { | |
b2cb9425 | 99 | *pos = '/'; |
67d42212 | 100 | return -3; |
b2cb9425 | 101 | } |
457f06d6 | 102 | } |
67d42212 JR |
103 | else if (mkdir(path, 0777)) { |
104 | *pos = '/'; | |
105 | return -1; | |
106 | } | |
457f06d6 JS |
107 | else if (adjust_shared_perm(path)) { |
108 | *pos = '/'; | |
109 | return -2; | |
110 | } | |
b2cb9425 JH |
111 | *pos++ = '/'; |
112 | } | |
113 | return 0; | |
114 | } | |
723c31fe | 115 | |
0fcfd160 LT |
116 | char * sha1_to_hex(const unsigned char *sha1) |
117 | { | |
dcb3450f LT |
118 | static int bufno; |
119 | static char hexbuffer[4][50]; | |
0fcfd160 | 120 | static const char hex[] = "0123456789abcdef"; |
dcb3450f | 121 | char *buffer = hexbuffer[3 & ++bufno], *buf = buffer; |
0fcfd160 LT |
122 | int i; |
123 | ||
124 | for (i = 0; i < 20; i++) { | |
125 | unsigned int val = *sha1++; | |
126 | *buf++ = hex[val >> 4]; | |
127 | *buf++ = hex[val & 0xf]; | |
128 | } | |
1e80e044 JS |
129 | *buf = '\0'; |
130 | ||
0fcfd160 LT |
131 | return buffer; |
132 | } | |
133 | ||
ace1534d JH |
134 | static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
135 | { | |
136 | int i; | |
137 | for (i = 0; i < 20; i++) { | |
138 | static char hex[] = "0123456789abcdef"; | |
139 | unsigned int val = sha1[i]; | |
140 | char *pos = pathbuf + i*2 + (i > 0); | |
141 | *pos++ = hex[val >> 4]; | |
142 | *pos = hex[val & 0xf]; | |
143 | } | |
144 | } | |
145 | ||
0fcfd160 LT |
146 | /* |
147 | * NOTE! This returns a statically allocated buffer, so you have to be | |
9befac47 | 148 | * careful about using it. Do a "xstrdup()" if you need to save the |
0fcfd160 | 149 | * filename. |
ace1534d JH |
150 | * |
151 | * Also note that this returns the location for creating. Reading | |
152 | * SHA1 file can happen from any alternate directory listed in the | |
d19938ab | 153 | * DB_ENVIRONMENT environment variable if it is not found in |
ace1534d | 154 | * the primary object database. |
0fcfd160 LT |
155 | */ |
156 | char *sha1_file_name(const unsigned char *sha1) | |
157 | { | |
0fcfd160 LT |
158 | static char *name, *base; |
159 | ||
160 | if (!base) { | |
d19938ab | 161 | const char *sha1_file_directory = get_object_directory(); |
0fcfd160 | 162 | int len = strlen(sha1_file_directory); |
812666c8 | 163 | base = xmalloc(len + 60); |
0fcfd160 LT |
164 | memcpy(base, sha1_file_directory, len); |
165 | memset(base+len, 0, 60); | |
166 | base[len] = '/'; | |
167 | base[len+3] = '/'; | |
168 | name = base + len + 1; | |
169 | } | |
ace1534d | 170 | fill_sha1_path(name, sha1); |
0fcfd160 LT |
171 | return base; |
172 | } | |
173 | ||
bf592c50 DB |
174 | char *sha1_pack_name(const unsigned char *sha1) |
175 | { | |
176 | static const char hex[] = "0123456789abcdef"; | |
177 | static char *name, *base, *buf; | |
178 | int i; | |
179 | ||
180 | if (!base) { | |
181 | const char *sha1_file_directory = get_object_directory(); | |
182 | int len = strlen(sha1_file_directory); | |
183 | base = xmalloc(len + 60); | |
184 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); | |
185 | name = base + len + 11; | |
186 | } | |
187 | ||
188 | buf = name; | |
189 | ||
190 | for (i = 0; i < 20; i++) { | |
191 | unsigned int val = *sha1++; | |
192 | *buf++ = hex[val >> 4]; | |
193 | *buf++ = hex[val & 0xf]; | |
194 | } | |
195 | ||
196 | return base; | |
197 | } | |
198 | ||
199 | char *sha1_pack_index_name(const unsigned char *sha1) | |
200 | { | |
201 | static const char hex[] = "0123456789abcdef"; | |
202 | static char *name, *base, *buf; | |
203 | int i; | |
204 | ||
205 | if (!base) { | |
206 | const char *sha1_file_directory = get_object_directory(); | |
207 | int len = strlen(sha1_file_directory); | |
208 | base = xmalloc(len + 60); | |
209 | sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); | |
210 | name = base + len + 11; | |
211 | } | |
212 | ||
213 | buf = name; | |
214 | ||
215 | for (i = 0; i < 20; i++) { | |
216 | unsigned int val = *sha1++; | |
217 | *buf++ = hex[val >> 4]; | |
218 | *buf++ = hex[val & 0xf]; | |
219 | } | |
220 | ||
221 | return base; | |
222 | } | |
223 | ||
d5a63b99 JH |
224 | struct alternate_object_database *alt_odb_list; |
225 | static struct alternate_object_database **alt_odb_tail; | |
ace1534d | 226 | |
c2f493a4 MW |
227 | static void read_info_alternates(const char * alternates, int depth); |
228 | ||
ddd5d056 JH |
229 | /* |
230 | * Prepare alternate object database registry. | |
d5a63b99 JH |
231 | * |
232 | * The variable alt_odb_list points at the list of struct | |
233 | * alternate_object_database. The elements on this list come from | |
234 | * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT | |
235 | * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, | |
1494e038 JH |
236 | * whose contents is similar to that environment variable but can be |
237 | * LF separated. Its base points at a statically allocated buffer that | |
d5a63b99 JH |
238 | * contains "/the/directory/corresponding/to/.git/objects/...", while |
239 | * its name points just after the slash at the end of ".git/objects/" | |
240 | * in the example above, and has enough space to hold 40-byte hex | |
241 | * SHA1, an extra slash for the first level indirection, and the | |
242 | * terminating NUL. | |
ddd5d056 | 243 | */ |
c2f493a4 | 244 | static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth) |
ace1534d | 245 | { |
c2f493a4 | 246 | struct stat st; |
1494e038 | 247 | const char *objdir = get_object_directory(); |
c2f493a4 MW |
248 | struct alternate_object_database *ent; |
249 | struct alternate_object_database *alt; | |
250 | /* 43 = 40-byte + 2 '/' + terminating NUL */ | |
251 | int pfxlen = len; | |
252 | int entlen = pfxlen + 43; | |
ccfd3e99 | 253 | int base_len = -1; |
d5a63b99 | 254 | |
c2f493a4 MW |
255 | if (*entry != '/' && relative_base) { |
256 | /* Relative alt-odb */ | |
257 | if (base_len < 0) | |
258 | base_len = strlen(relative_base) + 1; | |
259 | entlen += base_len; | |
260 | pfxlen += base_len; | |
261 | } | |
262 | ent = xmalloc(sizeof(*ent) + entlen); | |
263 | ||
264 | if (*entry != '/' && relative_base) { | |
265 | memcpy(ent->base, relative_base, base_len - 1); | |
266 | ent->base[base_len - 1] = '/'; | |
267 | memcpy(ent->base + base_len, entry, len); | |
268 | } | |
269 | else | |
270 | memcpy(ent->base, entry, pfxlen); | |
271 | ||
272 | ent->name = ent->base + pfxlen + 1; | |
273 | ent->base[pfxlen + 3] = '/'; | |
274 | ent->base[pfxlen] = ent->base[entlen-1] = 0; | |
275 | ||
276 | /* Detect cases where alternate disappeared */ | |
277 | if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { | |
278 | error("object directory %s does not exist; " | |
279 | "check .git/objects/info/alternates.", | |
280 | ent->base); | |
281 | free(ent); | |
282 | return -1; | |
283 | } | |
284 | ||
285 | /* Prevent the common mistake of listing the same | |
286 | * thing twice, or object directory itself. | |
287 | */ | |
288 | for (alt = alt_odb_list; alt; alt = alt->next) { | |
289 | if (!memcmp(ent->base, alt->base, pfxlen)) { | |
290 | free(ent); | |
291 | return -1; | |
292 | } | |
293 | } | |
294 | if (!memcmp(ent->base, objdir, pfxlen)) { | |
295 | free(ent); | |
296 | return -1; | |
297 | } | |
298 | ||
299 | /* add the alternate entry */ | |
300 | *alt_odb_tail = ent; | |
301 | alt_odb_tail = &(ent->next); | |
302 | ent->next = NULL; | |
303 | ||
304 | /* recursively add alternates */ | |
305 | read_info_alternates(ent->base, depth + 1); | |
306 | ||
307 | ent->base[pfxlen] = '/'; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static void link_alt_odb_entries(const char *alt, const char *ep, int sep, | |
313 | const char *relative_base, int depth) | |
314 | { | |
315 | const char *cp, *last; | |
316 | ||
317 | if (depth > 5) { | |
318 | error("%s: ignoring alternate object stores, nesting too deep.", | |
319 | relative_base); | |
320 | return; | |
321 | } | |
322 | ||
d5a63b99 | 323 | last = alt; |
9577e7e3 JH |
324 | while (last < ep) { |
325 | cp = last; | |
326 | if (cp < ep && *cp == '#') { | |
327 | while (cp < ep && *cp != sep) | |
328 | cp++; | |
329 | last = cp + 1; | |
330 | continue; | |
331 | } | |
c2f493a4 MW |
332 | while (cp < ep && *cp != sep) |
333 | cp++; | |
d5a63b99 | 334 | if (last != cp) { |
c2f493a4 MW |
335 | if ((*last != '/') && depth) { |
336 | error("%s: ignoring relative alternate object store %s", | |
337 | relative_base, last); | |
338 | } else { | |
339 | link_alt_odb_entry(last, cp - last, | |
340 | relative_base, depth); | |
1494e038 | 341 | } |
d5a63b99 | 342 | } |
9577e7e3 | 343 | while (cp < ep && *cp == sep) |
d5a63b99 JH |
344 | cp++; |
345 | last = cp; | |
9577e7e3 | 346 | } |
d5a63b99 JH |
347 | } |
348 | ||
c2f493a4 | 349 | static void read_info_alternates(const char * relative_base, int depth) |
d5a63b99 | 350 | { |
9577e7e3 | 351 | char *map; |
dc49cd76 | 352 | size_t mapsz; |
d5a63b99 | 353 | struct stat st; |
c2f493a4 MW |
354 | char path[PATH_MAX]; |
355 | int fd; | |
d5a63b99 | 356 | |
c2f493a4 | 357 | sprintf(path, "%s/info/alternates", relative_base); |
d5a63b99 JH |
358 | fd = open(path, O_RDONLY); |
359 | if (fd < 0) | |
360 | return; | |
361 | if (fstat(fd, &st) || (st.st_size == 0)) { | |
362 | close(fd); | |
9a217f2a | 363 | return; |
ace1534d | 364 | } |
dc49cd76 SP |
365 | mapsz = xsize_t(st.st_size); |
366 | map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0); | |
d5a63b99 | 367 | close(fd); |
d5a63b99 | 368 | |
dc49cd76 | 369 | link_alt_odb_entries(map, map + mapsz, '\n', relative_base, depth); |
c2f493a4 | 370 | |
dc49cd76 | 371 | munmap(map, mapsz); |
ace1534d JH |
372 | } |
373 | ||
c2f493a4 MW |
374 | void prepare_alt_odb(void) |
375 | { | |
554fe20d | 376 | const char *alt; |
c2f493a4 MW |
377 | |
378 | alt = getenv(ALTERNATE_DB_ENVIRONMENT); | |
379 | if (!alt) alt = ""; | |
380 | ||
381 | if (alt_odb_tail) | |
382 | return; | |
383 | alt_odb_tail = &alt_odb_list; | |
384 | link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0); | |
385 | ||
386 | read_info_alternates(get_object_directory(), 0); | |
387 | } | |
388 | ||
ace1534d JH |
389 | static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
390 | { | |
ace1534d | 391 | char *name = sha1_file_name(sha1); |
d5a63b99 | 392 | struct alternate_object_database *alt; |
ace1534d JH |
393 | |
394 | if (!stat(name, st)) | |
395 | return name; | |
9a217f2a | 396 | prepare_alt_odb(); |
d5a63b99 JH |
397 | for (alt = alt_odb_list; alt; alt = alt->next) { |
398 | name = alt->name; | |
ace1534d | 399 | fill_sha1_path(name, sha1); |
d5a63b99 JH |
400 | if (!stat(alt->base, st)) |
401 | return alt->base; | |
ace1534d JH |
402 | } |
403 | return NULL; | |
404 | } | |
405 | ||
60bb8b14 | 406 | static unsigned int pack_used_ctr; |
a53128b6 SP |
407 | static unsigned int pack_mmap_calls; |
408 | static unsigned int peak_pack_open_windows; | |
409 | static unsigned int pack_open_windows; | |
410 | static size_t peak_pack_mapped; | |
60bb8b14 | 411 | static size_t pack_mapped; |
9a217f2a | 412 | struct packed_git *packed_git; |
1f688557 | 413 | |
a53128b6 SP |
414 | void pack_report() |
415 | { | |
416 | fprintf(stderr, | |
e05db0fd PR |
417 | "pack_report: getpagesize() = %10" SZ_FMT "\n" |
418 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
419 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
78a28df9 | 420 | (size_t) getpagesize(), |
a53128b6 SP |
421 | packed_git_window_size, |
422 | packed_git_limit); | |
423 | fprintf(stderr, | |
424 | "pack_report: pack_used_ctr = %10u\n" | |
425 | "pack_report: pack_mmap_calls = %10u\n" | |
426 | "pack_report: pack_open_windows = %10u / %10u\n" | |
e05db0fd PR |
427 | "pack_report: pack_mapped = " |
428 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
a53128b6 SP |
429 | pack_used_ctr, |
430 | pack_mmap_calls, | |
431 | pack_open_windows, peak_pack_open_windows, | |
432 | pack_mapped, peak_pack_mapped); | |
433 | } | |
434 | ||
42873078 | 435 | static int check_packed_git_idx(const char *path, struct packed_git *p) |
1f688557 JH |
436 | { |
437 | void *idx_map; | |
42873078 | 438 | struct pack_idx_header *hdr; |
dc49cd76 | 439 | size_t idx_size; |
42873078 | 440 | uint32_t nr, i, *index; |
e93ec6f9 | 441 | int fd = open(path, O_RDONLY); |
1f688557 | 442 | struct stat st; |
42873078 | 443 | |
1f688557 JH |
444 | if (fd < 0) |
445 | return -1; | |
446 | if (fstat(fd, &st)) { | |
447 | close(fd); | |
448 | return -1; | |
449 | } | |
dc49cd76 | 450 | idx_size = xsize_t(st.st_size); |
2d88451b SP |
451 | if (idx_size < 4 * 256 + 20 + 20) { |
452 | close(fd); | |
453 | return error("index file %s is too small", path); | |
454 | } | |
c4712e45 | 455 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
1f688557 | 456 | close(fd); |
1f688557 | 457 | |
df1b059d SP |
458 | /* a future index format would start with this, as older git |
459 | * binaries would fail the non-monotonic index check below. | |
460 | * give a nicer warning to the user if we can. | |
461 | */ | |
42873078 NP |
462 | hdr = idx_map; |
463 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
2d88451b | 464 | munmap(idx_map, idx_size); |
df1b059d SP |
465 | return error("index file %s is a newer version" |
466 | " and is not supported by this binary" | |
467 | " (try upgrading GIT to a newer version)", | |
468 | path); | |
2d88451b | 469 | } |
df1b059d | 470 | |
1f688557 | 471 | nr = 0; |
42873078 | 472 | index = idx_map; |
1f688557 | 473 | for (i = 0; i < 256; i++) { |
326bf396 | 474 | uint32_t n = ntohl(index[i]); |
2d88451b SP |
475 | if (n < nr) { |
476 | munmap(idx_map, idx_size); | |
df1b059d | 477 | return error("non-monotonic index %s", path); |
2d88451b | 478 | } |
1f688557 JH |
479 | nr = n; |
480 | } | |
481 | ||
482 | /* | |
483 | * Total size: | |
484 | * - 256 index entries 4 bytes each | |
485 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
486 | * - 20-byte SHA1 of the packfile | |
487 | * - 20-byte SHA1 file checksum | |
488 | */ | |
2d88451b SP |
489 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { |
490 | munmap(idx_map, idx_size); | |
df1b059d | 491 | return error("wrong index file size in %s", path); |
2d88451b | 492 | } |
1f688557 | 493 | |
42873078 NP |
494 | p->index_version = 1; |
495 | p->index_data = idx_map; | |
496 | p->index_size = idx_size; | |
57059091 | 497 | p->num_objects = nr; |
1f688557 JH |
498 | return 0; |
499 | } | |
500 | ||
11daf39b SP |
501 | static void scan_windows(struct packed_git *p, |
502 | struct packed_git **lru_p, | |
503 | struct pack_window **lru_w, | |
504 | struct pack_window **lru_l) | |
1f688557 | 505 | { |
11daf39b SP |
506 | struct pack_window *w, *w_l; |
507 | ||
508 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
509 | if (!w->inuse_cnt) { | |
510 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
511 | *lru_p = p; | |
512 | *lru_w = w; | |
513 | *lru_l = w_l; | |
54044bf8 | 514 | } |
54044bf8 | 515 | } |
11daf39b | 516 | w_l = w; |
f9253394 | 517 | } |
11daf39b SP |
518 | } |
519 | ||
520 | static int unuse_one_window(struct packed_git *current) | |
521 | { | |
522 | struct packed_git *p, *lru_p = NULL; | |
523 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
524 | ||
525 | if (current) | |
526 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
527 | for (p = packed_git; p; p = p->next) | |
528 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
54044bf8 SP |
529 | if (lru_p) { |
530 | munmap(lru_w->base, lru_w->len); | |
531 | pack_mapped -= lru_w->len; | |
532 | if (lru_l) | |
533 | lru_l->next = lru_w->next; | |
534 | else { | |
535 | lru_p->windows = lru_w->next; | |
11daf39b | 536 | if (!lru_p->windows && lru_p != current) { |
54044bf8 SP |
537 | close(lru_p->pack_fd); |
538 | lru_p->pack_fd = -1; | |
539 | } | |
540 | } | |
541 | free(lru_w); | |
a53128b6 | 542 | pack_open_windows--; |
54044bf8 SP |
543 | return 1; |
544 | } | |
545 | return 0; | |
f9253394 JH |
546 | } |
547 | ||
97bfeb34 SP |
548 | void release_pack_memory(size_t need) |
549 | { | |
550 | size_t cur = pack_mapped; | |
551 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) | |
552 | ; /* nothing */ | |
553 | } | |
554 | ||
03e79c88 | 555 | void unuse_pack(struct pack_window **w_cursor) |
f9253394 | 556 | { |
03e79c88 SP |
557 | struct pack_window *w = *w_cursor; |
558 | if (w) { | |
559 | w->inuse_cnt--; | |
560 | *w_cursor = NULL; | |
561 | } | |
1f688557 JH |
562 | } |
563 | ||
3cf8b462 SP |
564 | /* |
565 | * Do not call this directly as this leaks p->pack_fd on error return; | |
566 | * call open_packed_git() instead. | |
567 | */ | |
568 | static int open_packed_git_1(struct packed_git *p) | |
1f688557 | 569 | { |
9bc879c1 SP |
570 | struct stat st; |
571 | struct pack_header hdr; | |
572 | unsigned char sha1[20]; | |
573 | unsigned char *idx_sha1; | |
2c039da8 | 574 | long fd_flag; |
9bc879c1 SP |
575 | |
576 | p->pack_fd = open(p->pack_name, O_RDONLY); | |
577 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
072db278 | 578 | return -1; |
9bc879c1 SP |
579 | |
580 | /* If we created the struct before we had the pack we lack size. */ | |
bf592c50 | 581 | if (!p->pack_size) { |
bf592c50 | 582 | if (!S_ISREG(st.st_mode)) |
072db278 | 583 | return error("packfile %s not a regular file", p->pack_name); |
bf592c50 | 584 | p->pack_size = st.st_size; |
9bc879c1 | 585 | } else if (p->pack_size != st.st_size) |
072db278 | 586 | return error("packfile %s size changed", p->pack_name); |
9bc879c1 | 587 | |
2c039da8 JH |
588 | /* We leave these file descriptors open with sliding mmap; |
589 | * there is no point keeping them open across exec(), though. | |
590 | */ | |
591 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
592 | if (fd_flag < 0) | |
072db278 | 593 | return error("cannot determine file descriptor flags"); |
2c039da8 JH |
594 | fd_flag |= FD_CLOEXEC; |
595 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
072db278 | 596 | return error("cannot set FD_CLOEXEC"); |
2c039da8 | 597 | |
9bc879c1 | 598 | /* Verify we recognize this pack file format. */ |
e6e2bd62 | 599 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) |
072db278 | 600 | return error("file %s is far too short to be a packfile", p->pack_name); |
9bc879c1 | 601 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) |
072db278 | 602 | return error("file %s is not a GIT packfile", p->pack_name); |
9bc879c1 | 603 | if (!pack_version_ok(hdr.hdr_version)) |
072db278 | 604 | return error("packfile %s is version %u and not supported" |
9bc879c1 SP |
605 | " (try upgrading GIT to a newer version)", |
606 | p->pack_name, ntohl(hdr.hdr_version)); | |
607 | ||
608 | /* Verify the pack matches its index. */ | |
57059091 | 609 | if (p->num_objects != ntohl(hdr.hdr_entries)) |
072db278 | 610 | return error("packfile %s claims to have %u objects" |
57059091 NP |
611 | " while index indicates %u objects", |
612 | p->pack_name, ntohl(hdr.hdr_entries), | |
613 | p->num_objects); | |
9bc879c1 | 614 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) |
072db278 | 615 | return error("end of packfile %s is unavailable", p->pack_name); |
e6e2bd62 | 616 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) |
072db278 | 617 | return error("packfile %s signature is unavailable", p->pack_name); |
42873078 | 618 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; |
9bc879c1 | 619 | if (hashcmp(sha1, idx_sha1)) |
072db278 SP |
620 | return error("packfile %s does not match index", p->pack_name); |
621 | return 0; | |
9bc879c1 SP |
622 | } |
623 | ||
3cf8b462 SP |
624 | static int open_packed_git(struct packed_git *p) |
625 | { | |
626 | if (!open_packed_git_1(p)) | |
627 | return 0; | |
628 | if (p->pack_fd != -1) { | |
629 | close(p->pack_fd); | |
630 | p->pack_fd = -1; | |
631 | } | |
632 | return -1; | |
633 | } | |
634 | ||
c4001d92 | 635 | static int in_window(struct pack_window *win, off_t offset) |
60bb8b14 SP |
636 | { |
637 | /* We must promise at least 20 bytes (one hash) after the | |
638 | * offset is available from this window, otherwise the offset | |
639 | * is not actually in this window and a different window (which | |
640 | * has that one hash excess) must be used. This is to support | |
641 | * the object header and delta base parsing routines below. | |
642 | */ | |
643 | off_t win_off = win->offset; | |
644 | return win_off <= offset | |
645 | && (offset + 20) <= (win_off + win->len); | |
646 | } | |
647 | ||
03e79c88 SP |
648 | unsigned char* use_pack(struct packed_git *p, |
649 | struct pack_window **w_cursor, | |
c4001d92 | 650 | off_t offset, |
03e79c88 | 651 | unsigned int *left) |
9bc879c1 | 652 | { |
60bb8b14 | 653 | struct pack_window *win = *w_cursor; |
03e79c88 | 654 | |
072db278 SP |
655 | if (p->pack_fd == -1 && open_packed_git(p)) |
656 | die("packfile %s cannot be accessed", p->pack_name); | |
60bb8b14 SP |
657 | |
658 | /* Since packfiles end in a hash of their content and its | |
659 | * pointless to ask for an offset into the middle of that | |
660 | * hash, and the in_window function above wouldn't match | |
661 | * don't allow an offset too close to the end of the file. | |
662 | */ | |
663 | if (offset > (p->pack_size - 20)) | |
664 | die("offset beyond end of packfile (truncated pack?)"); | |
665 | ||
666 | if (!win || !in_window(win, offset)) { | |
667 | if (win) | |
668 | win->inuse_cnt--; | |
669 | for (win = p->windows; win; win = win->next) { | |
670 | if (in_window(win, offset)) | |
671 | break; | |
672 | } | |
673 | if (!win) { | |
78a28df9 | 674 | size_t window_align = packed_git_window_size / 2; |
dc49cd76 | 675 | off_t len; |
60bb8b14 | 676 | win = xcalloc(1, sizeof(*win)); |
78a28df9 | 677 | win->offset = (offset / window_align) * window_align; |
dc49cd76 SP |
678 | len = p->pack_size - win->offset; |
679 | if (len > packed_git_window_size) | |
680 | len = packed_git_window_size; | |
681 | win->len = (size_t)len; | |
60bb8b14 | 682 | pack_mapped += win->len; |
11daf39b SP |
683 | while (packed_git_limit < pack_mapped |
684 | && unuse_one_window(p)) | |
60bb8b14 | 685 | ; /* nothing */ |
c4712e45 | 686 | win->base = xmmap(NULL, win->len, |
60bb8b14 SP |
687 | PROT_READ, MAP_PRIVATE, |
688 | p->pack_fd, win->offset); | |
689 | if (win->base == MAP_FAILED) | |
73b4e4be SP |
690 | die("packfile %s cannot be mapped: %s", |
691 | p->pack_name, | |
692 | strerror(errno)); | |
a53128b6 SP |
693 | pack_mmap_calls++; |
694 | pack_open_windows++; | |
695 | if (pack_mapped > peak_pack_mapped) | |
696 | peak_pack_mapped = pack_mapped; | |
697 | if (pack_open_windows > peak_pack_open_windows) | |
698 | peak_pack_open_windows = pack_open_windows; | |
60bb8b14 SP |
699 | win->next = p->windows; |
700 | p->windows = win; | |
701 | } | |
1f688557 | 702 | } |
03e79c88 SP |
703 | if (win != *w_cursor) { |
704 | win->last_used = pack_used_ctr++; | |
705 | win->inuse_cnt++; | |
706 | *w_cursor = win; | |
707 | } | |
60bb8b14 | 708 | offset -= win->offset; |
03e79c88 | 709 | if (left) |
dc49cd76 | 710 | *left = win->len - xsize_t(offset); |
03e79c88 | 711 | return win->base + offset; |
1f688557 JH |
712 | } |
713 | ||
42873078 | 714 | struct packed_git *add_packed_git(const char *path, int path_len, int local) |
1f688557 JH |
715 | { |
716 | struct stat st; | |
42873078 | 717 | struct packed_git *p = xmalloc(sizeof(*p) + path_len + 2); |
1f688557 | 718 | |
42873078 NP |
719 | /* |
720 | * Make sure a corresponding .pack file exists and that | |
721 | * the index looks sane. | |
722 | */ | |
723 | path_len -= strlen(".idx"); | |
724 | if (path_len < 1) | |
1f688557 | 725 | return NULL; |
42873078 NP |
726 | memcpy(p->pack_name, path, path_len); |
727 | strcpy(p->pack_name + path_len, ".pack"); | |
728 | if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode) || | |
729 | check_packed_git_idx(path, p)) { | |
730 | free(p); | |
1f688557 JH |
731 | return NULL; |
732 | } | |
42873078 | 733 | |
1f688557 JH |
734 | /* ok, it looks sane as far as we can check without |
735 | * actually mapping the pack file. | |
736 | */ | |
1f688557 | 737 | p->pack_size = st.st_size; |
1f688557 | 738 | p->next = NULL; |
c41ee586 | 739 | p->windows = NULL; |
9bc879c1 | 740 | p->pack_fd = -1; |
9d835df2 | 741 | p->pack_local = local; |
b867092f | 742 | p->mtime = st.st_mtime; |
42873078 NP |
743 | if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1)) |
744 | hashclr(p->sha1); | |
1f688557 JH |
745 | return p; |
746 | } | |
747 | ||
bf592c50 | 748 | struct packed_git *parse_pack_index(unsigned char *sha1) |
c508df5e DB |
749 | { |
750 | char *path = sha1_pack_index_name(sha1); | |
751 | return parse_pack_index_file(sha1, path); | |
752 | } | |
753 | ||
42873078 NP |
754 | struct packed_git *parse_pack_index_file(const unsigned char *sha1, |
755 | const char *idx_path) | |
bf592c50 | 756 | { |
42873078 NP |
757 | const char *path = sha1_pack_name(sha1); |
758 | struct packed_git *p = xmalloc(sizeof(*p) + strlen(path) + 2); | |
bf592c50 | 759 | |
42873078 NP |
760 | if (check_packed_git_idx(idx_path, p)) { |
761 | free(p); | |
bf592c50 | 762 | return NULL; |
42873078 | 763 | } |
bf592c50 | 764 | |
bf592c50 | 765 | strcpy(p->pack_name, path); |
bf592c50 | 766 | p->pack_size = 0; |
bf592c50 | 767 | p->next = NULL; |
c41ee586 | 768 | p->windows = NULL; |
9bc879c1 | 769 | p->pack_fd = -1; |
e702496e | 770 | hashcpy(p->sha1, sha1); |
bf592c50 DB |
771 | return p; |
772 | } | |
773 | ||
774 | void install_packed_git(struct packed_git *pack) | |
775 | { | |
776 | pack->next = packed_git; | |
777 | packed_git = pack; | |
778 | } | |
779 | ||
9d835df2 | 780 | static void prepare_packed_git_one(char *objdir, int local) |
1f688557 JH |
781 | { |
782 | char path[PATH_MAX]; | |
783 | int len; | |
784 | DIR *dir; | |
785 | struct dirent *de; | |
786 | ||
787 | sprintf(path, "%s/pack", objdir); | |
788 | len = strlen(path); | |
789 | dir = opendir(path); | |
b5b16990 | 790 | if (!dir) { |
26125f6b | 791 | if (errno != ENOENT) |
bd2afde8 | 792 | error("unable to open object pack directory: %s: %s", |
26125f6b | 793 | path, strerror(errno)); |
1f688557 | 794 | return; |
b5b16990 | 795 | } |
1f688557 JH |
796 | path[len++] = '/'; |
797 | while ((de = readdir(dir)) != NULL) { | |
798 | int namelen = strlen(de->d_name); | |
799 | struct packed_git *p; | |
800 | ||
5bb1cda5 | 801 | if (!has_extension(de->d_name, ".idx")) |
1f688557 JH |
802 | continue; |
803 | ||
54a15a8d | 804 | /* Don't reopen a pack we already have. */ |
1f688557 | 805 | strcpy(path + len, de->d_name); |
86f7780c JK |
806 | for (p = packed_git; p; p = p->next) { |
807 | if (!memcmp(path, p->pack_name, len + namelen - 4)) | |
808 | break; | |
809 | } | |
810 | if (p) | |
811 | continue; | |
54a15a8d SP |
812 | /* See if it really is a valid .idx file with corresponding |
813 | * .pack file that we can map. | |
814 | */ | |
9d835df2 | 815 | p = add_packed_git(path, len + namelen, local); |
1f688557 JH |
816 | if (!p) |
817 | continue; | |
625e9421 | 818 | install_packed_git(p); |
1f688557 | 819 | } |
5b35bcd5 | 820 | closedir(dir); |
1f688557 JH |
821 | } |
822 | ||
b867092f JH |
823 | static int sort_pack(const void *a_, const void *b_) |
824 | { | |
825 | struct packed_git *a = *((struct packed_git **)a_); | |
826 | struct packed_git *b = *((struct packed_git **)b_); | |
827 | int st; | |
828 | ||
829 | /* | |
830 | * Local packs tend to contain objects specific to our | |
831 | * variant of the project than remote ones. In addition, | |
832 | * remote ones could be on a network mounted filesystem. | |
833 | * Favor local ones for these reasons. | |
834 | */ | |
835 | st = a->pack_local - b->pack_local; | |
836 | if (st) | |
837 | return -st; | |
838 | ||
839 | /* | |
840 | * Younger packs tend to contain more recent objects, | |
841 | * and more recent objects tend to get accessed more | |
842 | * often. | |
843 | */ | |
844 | if (a->mtime < b->mtime) | |
845 | return 1; | |
846 | else if (a->mtime == b->mtime) | |
847 | return 0; | |
848 | return -1; | |
849 | } | |
850 | ||
851 | static void rearrange_packed_git(void) | |
852 | { | |
853 | struct packed_git **ary, *p; | |
854 | int i, n; | |
855 | ||
856 | for (n = 0, p = packed_git; p; p = p->next) | |
857 | n++; | |
858 | if (n < 2) | |
859 | return; | |
860 | ||
861 | /* prepare an array of packed_git for easier sorting */ | |
862 | ary = xcalloc(n, sizeof(struct packed_git *)); | |
863 | for (n = 0, p = packed_git; p; p = p->next) | |
864 | ary[n++] = p; | |
865 | ||
866 | qsort(ary, n, sizeof(struct packed_git *), sort_pack); | |
867 | ||
868 | /* link them back again */ | |
869 | for (i = 0; i < n - 1; i++) | |
870 | ary[i]->next = ary[i + 1]; | |
871 | ary[n - 1]->next = NULL; | |
872 | packed_git = ary[0]; | |
873 | ||
874 | free(ary); | |
875 | } | |
876 | ||
637cdd9d | 877 | static int prepare_packed_git_run_once = 0; |
9a217f2a | 878 | void prepare_packed_git(void) |
1f688557 | 879 | { |
d5a63b99 | 880 | struct alternate_object_database *alt; |
1f688557 | 881 | |
637cdd9d | 882 | if (prepare_packed_git_run_once) |
1f688557 | 883 | return; |
9d835df2 | 884 | prepare_packed_git_one(get_object_directory(), 1); |
9a217f2a | 885 | prepare_alt_odb(); |
d5a63b99 | 886 | for (alt = alt_odb_list; alt; alt = alt->next) { |
1494e038 | 887 | alt->name[-1] = 0; |
9d835df2 | 888 | prepare_packed_git_one(alt->base, 0); |
1494e038 | 889 | alt->name[-1] = '/'; |
1f688557 | 890 | } |
b867092f | 891 | rearrange_packed_git(); |
637cdd9d JK |
892 | prepare_packed_git_run_once = 1; |
893 | } | |
894 | ||
fc04c412 | 895 | void reprepare_packed_git(void) |
637cdd9d JK |
896 | { |
897 | prepare_packed_git_run_once = 0; | |
898 | prepare_packed_git(); | |
1f688557 JH |
899 | } |
900 | ||
5d6ccf5c | 901 | int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
0fcfd160 LT |
902 | { |
903 | unsigned char real_sha1[20]; | |
7cfb5f36 | 904 | hash_sha1_file(map, size, type, real_sha1); |
a89fccd2 | 905 | return hashcmp(sha1, real_sha1) ? -1 : 0; |
0fcfd160 LT |
906 | } |
907 | ||
bb6b8e4f | 908 | void *map_sha1_file(const unsigned char *sha1, unsigned long *size) |
0fcfd160 | 909 | { |
0fcfd160 LT |
910 | struct stat st; |
911 | void *map; | |
144bde78 | 912 | int fd; |
ace1534d JH |
913 | char *filename = find_sha1_file(sha1, &st); |
914 | ||
915 | if (!filename) { | |
ace1534d JH |
916 | return NULL; |
917 | } | |
0fcfd160 | 918 | |
144bde78 | 919 | fd = open(filename, O_RDONLY | sha1_file_open_flag); |
0fcfd160 | 920 | if (fd < 0) { |
144bde78 LT |
921 | /* See if it works without O_NOATIME */ |
922 | switch (sha1_file_open_flag) { | |
923 | default: | |
924 | fd = open(filename, O_RDONLY); | |
925 | if (fd >= 0) | |
926 | break; | |
927 | /* Fallthrough */ | |
928 | case 0: | |
144bde78 LT |
929 | return NULL; |
930 | } | |
931 | ||
1f688557 JH |
932 | /* If it failed once, it will probably fail again. |
933 | * Stop using O_NOATIME | |
934 | */ | |
144bde78 | 935 | sha1_file_open_flag = 0; |
0fcfd160 | 936 | } |
dc49cd76 SP |
937 | *size = xsize_t(st.st_size); |
938 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); | |
0fcfd160 | 939 | close(fd); |
0fcfd160 LT |
940 | return map; |
941 | } | |
942 | ||
bb6b8e4f JH |
943 | int legacy_loose_object(unsigned char *map) |
944 | { | |
945 | unsigned int word; | |
946 | ||
947 | /* | |
948 | * Is it a zlib-compressed buffer? If so, the first byte | |
949 | * must be 0x78 (15-bit window size, deflated), and the | |
950 | * first 16-bit word is evenly divisible by 31 | |
951 | */ | |
952 | word = (map[0] << 8) + map[1]; | |
953 | if (map[0] == 0x78 && !(word % 31)) | |
954 | return 1; | |
955 | else | |
956 | return 0; | |
957 | } | |
958 | ||
72518e9c | 959 | unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep) |
c4483576 | 960 | { |
ad1ed5ee | 961 | unsigned shift; |
93821bd9 | 962 | unsigned char c; |
93821bd9 | 963 | unsigned long size; |
ad1ed5ee JH |
964 | unsigned long used = 0; |
965 | ||
966 | c = buf[used++]; | |
967 | *type = (c >> 4) & 7; | |
968 | size = c & 15; | |
969 | shift = 4; | |
970 | while (c & 0x80) { | |
971 | if (len <= used) | |
972 | return 0; | |
973 | if (sizeof(long) * 8 <= shift) | |
974 | return 0; | |
975 | c = buf[used++]; | |
976 | size += (c & 0x7f) << shift; | |
977 | shift += 7; | |
978 | } | |
979 | *sizep = size; | |
980 | return used; | |
981 | } | |
982 | ||
983 | static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz) | |
984 | { | |
985 | unsigned long size, used; | |
986 | static const char valid_loose_object_type[8] = { | |
987 | 0, /* OBJ_EXT */ | |
988 | 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */ | |
989 | 0, /* "delta" and others are invalid in a loose object */ | |
93821bd9 | 990 | }; |
ad1ed5ee | 991 | enum object_type type; |
93821bd9 | 992 | |
c4483576 LT |
993 | /* Get the data stream */ |
994 | memset(stream, 0, sizeof(*stream)); | |
995 | stream->next_in = map; | |
996 | stream->avail_in = mapsize; | |
997 | stream->next_out = buffer; | |
93821bd9 LT |
998 | stream->avail_out = bufsiz; |
999 | ||
bb6b8e4f | 1000 | if (legacy_loose_object(map)) { |
93821bd9 LT |
1001 | inflateInit(stream); |
1002 | return inflate(stream, 0); | |
1003 | } | |
1004 | ||
ad1ed5ee JH |
1005 | used = unpack_object_header_gently(map, mapsize, &type, &size); |
1006 | if (!used || !valid_loose_object_type[type]) | |
93821bd9 | 1007 | return -1; |
ad1ed5ee JH |
1008 | map += used; |
1009 | mapsize -= used; | |
93821bd9 LT |
1010 | |
1011 | /* Set up the stream for the rest.. */ | |
1012 | stream->next_in = map; | |
1013 | stream->avail_in = mapsize; | |
c4483576 | 1014 | inflateInit(stream); |
93821bd9 LT |
1015 | |
1016 | /* And generate the fake traditional header */ | |
ad1ed5ee | 1017 | stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", |
df843662 | 1018 | typename(type), size); |
93821bd9 | 1019 | return 0; |
c4483576 LT |
1020 | } |
1021 | ||
7efbff75 | 1022 | static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size, const unsigned char *sha1) |
5180cacc LT |
1023 | { |
1024 | int bytes = strlen(buffer) + 1; | |
d565b341 | 1025 | unsigned char *buf = xmalloc(1+size); |
93821bd9 | 1026 | unsigned long n; |
7efbff75 | 1027 | int status = Z_OK; |
5180cacc | 1028 | |
93821bd9 LT |
1029 | n = stream->total_out - bytes; |
1030 | if (n > size) | |
1031 | n = size; | |
1032 | memcpy(buf, (char *) buffer + bytes, n); | |
1033 | bytes = n; | |
456cdf6e LT |
1034 | if (bytes <= size) { |
1035 | /* | |
1036 | * The above condition must be (bytes <= size), not | |
1037 | * (bytes < size). In other words, even though we | |
1038 | * expect no more output and set avail_out to zer0, | |
1039 | * the input zlib stream may have bytes that express | |
1040 | * "this concludes the stream", and we *do* want to | |
1041 | * eat that input. | |
1042 | * | |
1043 | * Otherwise we would not be able to test that we | |
1044 | * consumed all the input to reach the expected size; | |
1045 | * we also want to check that zlib tells us that all | |
1046 | * went well with status == Z_STREAM_END at the end. | |
1047 | */ | |
5180cacc LT |
1048 | stream->next_out = buf + bytes; |
1049 | stream->avail_out = size - bytes; | |
7efbff75 JH |
1050 | while (status == Z_OK) |
1051 | status = inflate(stream, Z_FINISH); | |
5180cacc LT |
1052 | } |
1053 | buf[size] = 0; | |
456cdf6e | 1054 | if (status == Z_STREAM_END && !stream->avail_in) { |
7efbff75 JH |
1055 | inflateEnd(stream); |
1056 | return buf; | |
1057 | } | |
1058 | ||
1059 | if (status < 0) | |
1060 | error("corrupt loose object '%s'", sha1_to_hex(sha1)); | |
1061 | else if (stream->avail_in) | |
1062 | error("garbage at end of loose object '%s'", | |
1063 | sha1_to_hex(sha1)); | |
1064 | free(buf); | |
1065 | return NULL; | |
5180cacc LT |
1066 | } |
1067 | ||
1068 | /* | |
1069 | * We used to just use "sscanf()", but that's actually way | |
1070 | * too permissive for what we want to check. So do an anal | |
1071 | * object header parse by hand. | |
1072 | */ | |
21666f1a | 1073 | static int parse_sha1_header(const char *hdr, unsigned long *sizep) |
5180cacc | 1074 | { |
21666f1a | 1075 | char type[10]; |
5180cacc LT |
1076 | int i; |
1077 | unsigned long size; | |
1078 | ||
1079 | /* | |
1080 | * The type can be at most ten bytes (including the | |
1081 | * terminating '\0' that we add), and is followed by | |
21666f1a | 1082 | * a space. |
5180cacc | 1083 | */ |
21666f1a | 1084 | i = 0; |
5180cacc LT |
1085 | for (;;) { |
1086 | char c = *hdr++; | |
1087 | if (c == ' ') | |
1088 | break; | |
21666f1a NP |
1089 | type[i++] = c; |
1090 | if (i >= sizeof(type)) | |
5180cacc | 1091 | return -1; |
5180cacc | 1092 | } |
21666f1a | 1093 | type[i] = 0; |
5180cacc LT |
1094 | |
1095 | /* | |
1096 | * The length must follow immediately, and be in canonical | |
1097 | * decimal format (ie "010" is not valid). | |
1098 | */ | |
1099 | size = *hdr++ - '0'; | |
1100 | if (size > 9) | |
1101 | return -1; | |
1102 | if (size) { | |
1103 | for (;;) { | |
1104 | unsigned long c = *hdr - '0'; | |
1105 | if (c > 9) | |
1106 | break; | |
1107 | hdr++; | |
1108 | size = size * 10 + c; | |
1109 | } | |
1110 | } | |
1111 | *sizep = size; | |
1112 | ||
1113 | /* | |
1114 | * The length must be followed by a zero byte | |
1115 | */ | |
21666f1a | 1116 | return *hdr ? -1 : type_from_string(type); |
5180cacc LT |
1117 | } |
1118 | ||
7efbff75 | 1119 | static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1) |
0fcfd160 | 1120 | { |
5180cacc | 1121 | int ret; |
0fcfd160 | 1122 | z_stream stream; |
5180cacc | 1123 | char hdr[8192]; |
0fcfd160 | 1124 | |
5180cacc | 1125 | ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
21666f1a | 1126 | if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0) |
0fcfd160 LT |
1127 | return NULL; |
1128 | ||
7efbff75 | 1129 | return unpack_sha1_rest(&stream, hdr, *size, sha1); |
0fcfd160 LT |
1130 | } |
1131 | ||
c4001d92 | 1132 | static off_t get_delta_base(struct packed_git *p, |
03e79c88 | 1133 | struct pack_window **w_curs, |
c4001d92 | 1134 | off_t *curpos, |
21666f1a | 1135 | enum object_type type, |
c4001d92 | 1136 | off_t delta_obj_offset) |
eb32d236 | 1137 | { |
2b87c45b | 1138 | unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL); |
c4001d92 | 1139 | off_t base_offset; |
eb32d236 | 1140 | |
8d8a4ea5 SP |
1141 | /* use_pack() assured us we have [base_info, base_info + 20) |
1142 | * as a range that we can look at without walking off the | |
1143 | * end of the mapped window. Its actually the hash size | |
1144 | * that is assured. An OFS_DELTA longer than the hash size | |
1145 | * is stupid, as then a REF_DELTA would be smaller to store. | |
1146 | */ | |
21666f1a | 1147 | if (type == OBJ_OFS_DELTA) { |
eb32d236 NP |
1148 | unsigned used = 0; |
1149 | unsigned char c = base_info[used++]; | |
1150 | base_offset = c & 127; | |
1151 | while (c & 128) { | |
1152 | base_offset += 1; | |
1153 | if (!base_offset || base_offset & ~(~0UL >> 7)) | |
1154 | die("offset value overflow for delta base object"); | |
1155 | c = base_info[used++]; | |
1156 | base_offset = (base_offset << 7) + (c & 127); | |
1157 | } | |
1158 | base_offset = delta_obj_offset - base_offset; | |
1159 | if (base_offset >= delta_obj_offset) | |
1160 | die("delta base offset out of bound"); | |
2b87c45b | 1161 | *curpos += used; |
21666f1a | 1162 | } else if (type == OBJ_REF_DELTA) { |
eb32d236 NP |
1163 | /* The base entry _must_ be in the same pack */ |
1164 | base_offset = find_pack_entry_one(base_info, p); | |
1165 | if (!base_offset) | |
1166 | die("failed to find delta-pack base object %s", | |
1167 | sha1_to_hex(base_info)); | |
2b87c45b | 1168 | *curpos += 20; |
eb32d236 NP |
1169 | } else |
1170 | die("I am totally screwed"); | |
2b87c45b | 1171 | return base_offset; |
eb32d236 NP |
1172 | } |
1173 | ||
f3bf9224 | 1174 | /* forward declaration for a mutually recursive function */ |
c4001d92 | 1175 | static int packed_object_info(struct packed_git *p, off_t offset, |
21666f1a | 1176 | unsigned long *sizep); |
f3bf9224 | 1177 | |
43057304 | 1178 | static int packed_delta_info(struct packed_git *p, |
03e79c88 | 1179 | struct pack_window **w_curs, |
c4001d92 | 1180 | off_t curpos, |
21666f1a | 1181 | enum object_type type, |
c4001d92 | 1182 | off_t obj_offset, |
43057304 | 1183 | unsigned long *sizep) |
5db47c2b | 1184 | { |
c4001d92 | 1185 | off_t base_offset; |
f3bf9224 | 1186 | |
21666f1a NP |
1187 | base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset); |
1188 | type = packed_object_info(p, base_offset, NULL); | |
f3bf9224 | 1189 | |
c62266f3 JH |
1190 | /* We choose to only get the type of the base object and |
1191 | * ignore potentially corrupt pack file that expects the delta | |
1192 | * based on a base with a wrong size. This saves tons of | |
1193 | * inflate() calls. | |
1194 | */ | |
c62266f3 JH |
1195 | if (sizep) { |
1196 | const unsigned char *data; | |
079afb18 | 1197 | unsigned char delta_head[20], *in; |
c62266f3 JH |
1198 | z_stream stream; |
1199 | int st; | |
1200 | ||
1201 | memset(&stream, 0, sizeof(stream)); | |
c62266f3 JH |
1202 | stream.next_out = delta_head; |
1203 | stream.avail_out = sizeof(delta_head); | |
1204 | ||
1205 | inflateInit(&stream); | |
079afb18 | 1206 | do { |
2b87c45b | 1207 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1208 | stream.next_in = in; |
1209 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1210 | curpos += stream.next_in - in; |
079afb18 SP |
1211 | } while ((st == Z_OK || st == Z_BUF_ERROR) |
1212 | && stream.total_out < sizeof(delta_head)); | |
c62266f3 JH |
1213 | inflateEnd(&stream); |
1214 | if ((st != Z_STREAM_END) && | |
1215 | stream.total_out != sizeof(delta_head)) | |
1216 | die("delta data unpack-initial failed"); | |
1217 | ||
1218 | /* Examine the initial part of the delta to figure out | |
1219 | * the result size. | |
1220 | */ | |
1221 | data = delta_head; | |
8960844a NP |
1222 | |
1223 | /* ignore base size */ | |
1224 | get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); | |
5db47c2b | 1225 | |
c62266f3 | 1226 | /* Read the result size */ |
2b87c45b | 1227 | *sizep = get_delta_hdr_size(&data, delta_head+sizeof(delta_head)); |
c62266f3 | 1228 | } |
21666f1a NP |
1229 | |
1230 | return type; | |
5db47c2b JH |
1231 | } |
1232 | ||
2b87c45b NP |
1233 | static int unpack_object_header(struct packed_git *p, |
1234 | struct pack_window **w_curs, | |
c4001d92 | 1235 | off_t *curpos, |
2b87c45b | 1236 | unsigned long *sizep) |
a733cb60 | 1237 | { |
03e79c88 SP |
1238 | unsigned char *base; |
1239 | unsigned int left; | |
ad1ed5ee | 1240 | unsigned long used; |
2b87c45b | 1241 | enum object_type type; |
a733cb60 | 1242 | |
8d8a4ea5 SP |
1243 | /* use_pack() assures us we have [base, base + 20) available |
1244 | * as a range that we can look at at. (Its actually the hash | |
3dff5379 | 1245 | * size that is assured.) With our object header encoding |
8d8a4ea5 SP |
1246 | * the maximum deflated object size is 2^137, which is just |
1247 | * insane, so we know won't exceed what we have been given. | |
1248 | */ | |
2b87c45b NP |
1249 | base = use_pack(p, w_curs, *curpos, &left); |
1250 | used = unpack_object_header_gently(base, left, &type, sizep); | |
ad1ed5ee JH |
1251 | if (!used) |
1252 | die("object offset outside of pack file"); | |
2b87c45b | 1253 | *curpos += used; |
ad1ed5ee | 1254 | |
2b87c45b | 1255 | return type; |
a733cb60 LT |
1256 | } |
1257 | ||
21666f1a | 1258 | const char *packed_object_info_detail(struct packed_git *p, |
c4001d92 | 1259 | off_t obj_offset, |
21666f1a NP |
1260 | unsigned long *size, |
1261 | unsigned long *store_size, | |
1262 | unsigned int *delta_chain_length, | |
1263 | unsigned char *base_sha1) | |
ad8c80a5 | 1264 | { |
03e79c88 | 1265 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1266 | off_t curpos; |
1267 | unsigned long dummy; | |
43057304 | 1268 | unsigned char *next_sha1; |
21666f1a | 1269 | enum object_type type; |
ad8c80a5 | 1270 | |
43057304 | 1271 | *delta_chain_length = 0; |
2b87c45b | 1272 | curpos = obj_offset; |
21666f1a | 1273 | type = unpack_object_header(p, &w_curs, &curpos, size); |
43057304 NP |
1274 | |
1275 | for (;;) { | |
21666f1a | 1276 | switch (type) { |
43057304 | 1277 | default: |
08a19d87 | 1278 | die("pack %s contains unknown object type %d", |
21666f1a | 1279 | p->pack_name, type); |
43057304 NP |
1280 | case OBJ_COMMIT: |
1281 | case OBJ_TREE: | |
1282 | case OBJ_BLOB: | |
1283 | case OBJ_TAG: | |
43057304 | 1284 | *store_size = 0; /* notyet */ |
03e79c88 | 1285 | unuse_pack(&w_curs); |
21666f1a | 1286 | return typename(type); |
eb32d236 | 1287 | case OBJ_OFS_DELTA: |
21666f1a | 1288 | obj_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset); |
eb32d236 | 1289 | if (*delta_chain_length == 0) { |
2b87c45b | 1290 | /* TODO: find base_sha1 as pointed by curpos */ |
30fee062 | 1291 | hashclr(base_sha1); |
eb32d236 NP |
1292 | } |
1293 | break; | |
1294 | case OBJ_REF_DELTA: | |
2b87c45b | 1295 | next_sha1 = use_pack(p, &w_curs, curpos, NULL); |
43057304 NP |
1296 | if (*delta_chain_length == 0) |
1297 | hashcpy(base_sha1, next_sha1); | |
2b87c45b | 1298 | obj_offset = find_pack_entry_one(next_sha1, p); |
43057304 NP |
1299 | break; |
1300 | } | |
43057304 | 1301 | (*delta_chain_length)++; |
2b87c45b | 1302 | curpos = obj_offset; |
21666f1a | 1303 | type = unpack_object_header(p, &w_curs, &curpos, &dummy); |
ad8c80a5 | 1304 | } |
ad8c80a5 JH |
1305 | } |
1306 | ||
c4001d92 | 1307 | static int packed_object_info(struct packed_git *p, off_t obj_offset, |
21666f1a | 1308 | unsigned long *sizep) |
1f688557 | 1309 | { |
03e79c88 | 1310 | struct pack_window *w_curs = NULL; |
c4001d92 SP |
1311 | unsigned long size; |
1312 | off_t curpos = obj_offset; | |
21666f1a | 1313 | enum object_type type; |
5db47c2b | 1314 | |
21666f1a | 1315 | type = unpack_object_header(p, &w_curs, &curpos, &size); |
5db47c2b | 1316 | |
21666f1a | 1317 | switch (type) { |
eb32d236 NP |
1318 | case OBJ_OFS_DELTA: |
1319 | case OBJ_REF_DELTA: | |
21666f1a NP |
1320 | type = packed_delta_info(p, &w_curs, curpos, |
1321 | type, obj_offset, sizep); | |
2b87c45b | 1322 | break; |
a733cb60 | 1323 | case OBJ_COMMIT: |
a733cb60 | 1324 | case OBJ_TREE: |
a733cb60 | 1325 | case OBJ_BLOB: |
a733cb60 | 1326 | case OBJ_TAG: |
2b87c45b NP |
1327 | if (sizep) |
1328 | *sizep = size; | |
a69d0943 | 1329 | break; |
1f688557 | 1330 | default: |
08a19d87 | 1331 | die("pack %s contains unknown object type %d", |
21666f1a | 1332 | p->pack_name, type); |
1f688557 | 1333 | } |
2b87c45b | 1334 | unuse_pack(&w_curs); |
21666f1a | 1335 | return type; |
1f688557 JH |
1336 | } |
1337 | ||
eb950c19 | 1338 | static void *unpack_compressed_entry(struct packed_git *p, |
03e79c88 | 1339 | struct pack_window **w_curs, |
c4001d92 | 1340 | off_t curpos, |
eb950c19 | 1341 | unsigned long size) |
de530aaa SP |
1342 | { |
1343 | int st; | |
1344 | z_stream stream; | |
079afb18 | 1345 | unsigned char *buffer, *in; |
de530aaa SP |
1346 | |
1347 | buffer = xmalloc(size + 1); | |
1348 | buffer[size] = 0; | |
1349 | memset(&stream, 0, sizeof(stream)); | |
de530aaa SP |
1350 | stream.next_out = buffer; |
1351 | stream.avail_out = size; | |
1352 | ||
1353 | inflateInit(&stream); | |
079afb18 | 1354 | do { |
2b87c45b | 1355 | in = use_pack(p, w_curs, curpos, &stream.avail_in); |
079afb18 SP |
1356 | stream.next_in = in; |
1357 | st = inflate(&stream, Z_FINISH); | |
2b87c45b | 1358 | curpos += stream.next_in - in; |
079afb18 | 1359 | } while (st == Z_OK || st == Z_BUF_ERROR); |
de530aaa SP |
1360 | inflateEnd(&stream); |
1361 | if ((st != Z_STREAM_END) || stream.total_out != size) { | |
1362 | free(buffer); | |
1363 | return NULL; | |
1364 | } | |
1365 | ||
1366 | return buffer; | |
1367 | } | |
1368 | ||
e5e01619 LT |
1369 | #define MAX_DELTA_CACHE (256) |
1370 | ||
18bdec11 | 1371 | static size_t delta_base_cached; |
5e08ecbf NP |
1372 | |
1373 | static struct delta_base_cache_lru_list { | |
1374 | struct delta_base_cache_lru_list *prev; | |
1375 | struct delta_base_cache_lru_list *next; | |
1376 | } delta_base_cache_lru = { &delta_base_cache_lru, &delta_base_cache_lru }; | |
1377 | ||
e5e01619 | 1378 | static struct delta_base_cache_entry { |
5e08ecbf NP |
1379 | struct delta_base_cache_lru_list lru; |
1380 | void *data; | |
e5e01619 LT |
1381 | struct packed_git *p; |
1382 | off_t base_offset; | |
1383 | unsigned long size; | |
e5e01619 LT |
1384 | enum object_type type; |
1385 | } delta_base_cache[MAX_DELTA_CACHE]; | |
1386 | ||
1387 | static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset) | |
1388 | { | |
1389 | unsigned long hash; | |
1390 | ||
1391 | hash = (unsigned long)p + (unsigned long)base_offset; | |
1392 | hash += (hash >> 8) + (hash >> 16); | |
3358004a | 1393 | return hash % MAX_DELTA_CACHE; |
e5e01619 LT |
1394 | } |
1395 | ||
62f255ad | 1396 | static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset, |
a0cba108 | 1397 | unsigned long *base_size, enum object_type *type, int keep_cache) |
62f255ad | 1398 | { |
e5e01619 LT |
1399 | void *ret; |
1400 | unsigned long hash = pack_entry_hash(p, base_offset); | |
1401 | struct delta_base_cache_entry *ent = delta_base_cache + hash; | |
1402 | ||
1403 | ret = ent->data; | |
1404 | if (ret && ent->p == p && ent->base_offset == base_offset) | |
1405 | goto found_cache_entry; | |
62f255ad | 1406 | return unpack_entry(p, base_offset, type, base_size); |
e5e01619 LT |
1407 | |
1408 | found_cache_entry: | |
18bdec11 | 1409 | if (!keep_cache) { |
a0cba108 | 1410 | ent->data = NULL; |
5e08ecbf NP |
1411 | ent->lru.next->prev = ent->lru.prev; |
1412 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1413 | delta_base_cached -= ent->size; |
1414 | } | |
a0cba108 NP |
1415 | else { |
1416 | ret = xmalloc(ent->size + 1); | |
1417 | memcpy(ret, ent->data, ent->size); | |
1418 | ((char *)ret)[ent->size] = 0; | |
1419 | } | |
e5e01619 LT |
1420 | *type = ent->type; |
1421 | *base_size = ent->size; | |
1422 | return ret; | |
62f255ad LT |
1423 | } |
1424 | ||
18bdec11 SP |
1425 | static inline void release_delta_base_cache(struct delta_base_cache_entry *ent) |
1426 | { | |
1427 | if (ent->data) { | |
1428 | free(ent->data); | |
1429 | ent->data = NULL; | |
5e08ecbf NP |
1430 | ent->lru.next->prev = ent->lru.prev; |
1431 | ent->lru.prev->next = ent->lru.next; | |
18bdec11 SP |
1432 | delta_base_cached -= ent->size; |
1433 | } | |
1434 | } | |
1435 | ||
62f255ad LT |
1436 | static void add_delta_base_cache(struct packed_git *p, off_t base_offset, |
1437 | void *base, unsigned long base_size, enum object_type type) | |
1438 | { | |
5e08ecbf | 1439 | unsigned long hash = pack_entry_hash(p, base_offset); |
e5e01619 | 1440 | struct delta_base_cache_entry *ent = delta_base_cache + hash; |
5e08ecbf | 1441 | struct delta_base_cache_lru_list *lru; |
e5e01619 | 1442 | |
18bdec11 SP |
1443 | release_delta_base_cache(ent); |
1444 | delta_base_cached += base_size; | |
5e08ecbf NP |
1445 | |
1446 | for (lru = delta_base_cache_lru.next; | |
1447 | delta_base_cached > delta_base_cache_limit | |
1448 | && lru != &delta_base_cache_lru; | |
1449 | lru = lru->next) { | |
1450 | struct delta_base_cache_entry *f = (void *)lru; | |
18bdec11 SP |
1451 | if (f->type == OBJ_BLOB) |
1452 | release_delta_base_cache(f); | |
1453 | } | |
5e08ecbf NP |
1454 | for (lru = delta_base_cache_lru.next; |
1455 | delta_base_cached > delta_base_cache_limit | |
1456 | && lru != &delta_base_cache_lru; | |
1457 | lru = lru->next) { | |
1458 | struct delta_base_cache_entry *f = (void *)lru; | |
1459 | release_delta_base_cache(f); | |
1460 | } | |
18bdec11 | 1461 | |
e5e01619 LT |
1462 | ent->p = p; |
1463 | ent->base_offset = base_offset; | |
1464 | ent->type = type; | |
1465 | ent->data = base; | |
1466 | ent->size = base_size; | |
5e08ecbf NP |
1467 | ent->lru.next = &delta_base_cache_lru; |
1468 | ent->lru.prev = delta_base_cache_lru.prev; | |
1469 | delta_base_cache_lru.prev->next = &ent->lru; | |
1470 | delta_base_cache_lru.prev = &ent->lru; | |
62f255ad LT |
1471 | } |
1472 | ||
eb950c19 | 1473 | static void *unpack_delta_entry(struct packed_git *p, |
03e79c88 | 1474 | struct pack_window **w_curs, |
c4001d92 | 1475 | off_t curpos, |
1f688557 | 1476 | unsigned long delta_size, |
c4001d92 | 1477 | off_t obj_offset, |
21666f1a | 1478 | enum object_type *type, |
eb950c19 | 1479 | unsigned long *sizep) |
1f688557 | 1480 | { |
7c3e8be3 | 1481 | void *delta_data, *result, *base; |
c4001d92 SP |
1482 | unsigned long base_size; |
1483 | off_t base_offset; | |
43057304 | 1484 | |
21666f1a | 1485 | base_offset = get_delta_base(p, w_curs, &curpos, *type, obj_offset); |
a0cba108 | 1486 | base = cache_or_unpack_entry(p, base_offset, &base_size, type, 0); |
67686d95 | 1487 | if (!base) |
c4001d92 SP |
1488 | die("failed to read delta base object" |
1489 | " at %"PRIuMAX" from %s", | |
1490 | (uintmax_t)base_offset, p->pack_name); | |
67686d95 | 1491 | |
2b87c45b | 1492 | delta_data = unpack_compressed_entry(p, w_curs, curpos, delta_size); |
1f688557 JH |
1493 | result = patch_delta(base, base_size, |
1494 | delta_data, delta_size, | |
21666f1a | 1495 | sizep); |
1f688557 JH |
1496 | if (!result) |
1497 | die("failed to apply delta"); | |
1498 | free(delta_data); | |
62f255ad | 1499 | add_delta_base_cache(p, base_offset, base, base_size, *type); |
1f688557 JH |
1500 | return result; |
1501 | } | |
1502 | ||
c4001d92 | 1503 | void *unpack_entry(struct packed_git *p, off_t obj_offset, |
21666f1a | 1504 | enum object_type *type, unsigned long *sizep) |
1f688557 | 1505 | { |
03e79c88 | 1506 | struct pack_window *w_curs = NULL; |
c4001d92 | 1507 | off_t curpos = obj_offset; |
21666f1a | 1508 | void *data; |
1f688557 | 1509 | |
21666f1a NP |
1510 | *type = unpack_object_header(p, &w_curs, &curpos, sizep); |
1511 | switch (*type) { | |
eb32d236 NP |
1512 | case OBJ_OFS_DELTA: |
1513 | case OBJ_REF_DELTA: | |
21666f1a NP |
1514 | data = unpack_delta_entry(p, &w_curs, curpos, *sizep, |
1515 | obj_offset, type, sizep); | |
4d703a1a | 1516 | break; |
a733cb60 | 1517 | case OBJ_COMMIT: |
a733cb60 | 1518 | case OBJ_TREE: |
a733cb60 | 1519 | case OBJ_BLOB: |
a733cb60 | 1520 | case OBJ_TAG: |
21666f1a | 1521 | data = unpack_compressed_entry(p, &w_curs, curpos, *sizep); |
4d703a1a | 1522 | break; |
1f688557 | 1523 | default: |
21666f1a | 1524 | die("unknown object type %i in %s", *type, p->pack_name); |
1f688557 | 1525 | } |
03e79c88 | 1526 | unuse_pack(&w_curs); |
21666f1a | 1527 | return data; |
1f688557 JH |
1528 | } |
1529 | ||
d72308e0 NP |
1530 | const unsigned char *nth_packed_object_sha1(const struct packed_git *p, |
1531 | uint32_t n) | |
9a217f2a | 1532 | { |
42873078 NP |
1533 | const unsigned char *index = p->index_data; |
1534 | index += 4 * 256; | |
57059091 | 1535 | if (n >= p->num_objects) |
d72308e0 NP |
1536 | return NULL; |
1537 | return index + 24 * n + 4; | |
9a217f2a JH |
1538 | } |
1539 | ||
c4001d92 | 1540 | off_t find_pack_entry_one(const unsigned char *sha1, |
43057304 | 1541 | struct packed_git *p) |
1f688557 | 1542 | { |
42873078 | 1543 | const uint32_t *level1_ofs = p->index_data; |
1f688557 JH |
1544 | int hi = ntohl(level1_ofs[*sha1]); |
1545 | int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); | |
42873078 NP |
1546 | const unsigned char *index = p->index_data; |
1547 | ||
1548 | index += 4 * 256; | |
1f688557 JH |
1549 | |
1550 | do { | |
1551 | int mi = (lo + hi) / 2; | |
42873078 | 1552 | int cmp = hashcmp(index + 24 * mi + 4, sha1); |
43057304 | 1553 | if (!cmp) |
b18b00a6 | 1554 | return ntohl(*((uint32_t *)((char *)index + (24 * mi)))); |
1f688557 JH |
1555 | if (cmp > 0) |
1556 | hi = mi; | |
1557 | else | |
1558 | lo = mi+1; | |
1559 | } while (lo < hi); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
d4ff6d92 SP |
1563 | static int matches_pack_name(struct packed_git *p, const char *ig) |
1564 | { | |
1565 | const char *last_c, *c; | |
1566 | ||
1567 | if (!strcmp(p->pack_name, ig)) | |
1568 | return 0; | |
1569 | ||
1570 | for (c = p->pack_name, last_c = c; *c;) | |
1571 | if (*c == '/') | |
1572 | last_c = ++c; | |
1573 | else | |
1574 | ++c; | |
1575 | if (!strcmp(last_c, ig)) | |
1576 | return 0; | |
1577 | ||
1578 | return 1; | |
1579 | } | |
1580 | ||
106d710b | 1581 | static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed) |
1f688557 JH |
1582 | { |
1583 | struct packed_git *p; | |
c4001d92 | 1584 | off_t offset; |
43057304 | 1585 | |
1f688557 JH |
1586 | prepare_packed_git(); |
1587 | ||
1588 | for (p = packed_git; p; p = p->next) { | |
106d710b JH |
1589 | if (ignore_packed) { |
1590 | const char **ig; | |
1591 | for (ig = ignore_packed; *ig; ig++) | |
d4ff6d92 | 1592 | if (!matches_pack_name(p, *ig)) |
106d710b JH |
1593 | break; |
1594 | if (*ig) | |
1595 | continue; | |
1596 | } | |
43057304 NP |
1597 | offset = find_pack_entry_one(sha1, p); |
1598 | if (offset) { | |
c715f783 SP |
1599 | /* |
1600 | * We are about to tell the caller where they can | |
1601 | * locate the requested object. We better make | |
1602 | * sure the packfile is still here and can be | |
1603 | * accessed before supplying that answer, as | |
1604 | * it may have been deleted since the index | |
1605 | * was loaded! | |
1606 | */ | |
1607 | if (p->pack_fd == -1 && open_packed_git(p)) { | |
1608 | error("packfile %s cannot be accessed", p->pack_name); | |
1609 | continue; | |
1610 | } | |
43057304 NP |
1611 | e->offset = offset; |
1612 | e->p = p; | |
1613 | hashcpy(e->sha1, sha1); | |
1f688557 | 1614 | return 1; |
43057304 | 1615 | } |
1f688557 JH |
1616 | } |
1617 | return 0; | |
1618 | } | |
1619 | ||
bf592c50 DB |
1620 | struct packed_git *find_sha1_pack(const unsigned char *sha1, |
1621 | struct packed_git *packs) | |
1622 | { | |
1623 | struct packed_git *p; | |
bf592c50 DB |
1624 | |
1625 | for (p = packs; p; p = p->next) { | |
43057304 | 1626 | if (find_pack_entry_one(sha1, p)) |
bf592c50 DB |
1627 | return p; |
1628 | } | |
1629 | return NULL; | |
21666f1a | 1630 | |
bf592c50 DB |
1631 | } |
1632 | ||
21666f1a | 1633 | static int sha1_loose_object_info(const unsigned char *sha1, unsigned long *sizep) |
65c2e0c3 | 1634 | { |
36e4d74a | 1635 | int status; |
65c2e0c3 JH |
1636 | unsigned long mapsize, size; |
1637 | void *map; | |
1638 | z_stream stream; | |
d65a16f6 | 1639 | char hdr[32]; |
65c2e0c3 | 1640 | |
bb6b8e4f | 1641 | map = map_sha1_file(sha1, &mapsize); |
f0df4ed5 JS |
1642 | if (!map) |
1643 | return error("unable to find %s", sha1_to_hex(sha1)); | |
36e4d74a JH |
1644 | if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
1645 | status = error("unable to unpack %s header", | |
1646 | sha1_to_hex(sha1)); | |
21666f1a | 1647 | else if ((status = parse_sha1_header(hdr, &size)) < 0) |
36e4d74a | 1648 | status = error("unable to parse %s header", sha1_to_hex(sha1)); |
21666f1a NP |
1649 | else if (sizep) |
1650 | *sizep = size; | |
65c2e0c3 JH |
1651 | inflateEnd(&stream); |
1652 | munmap(map, mapsize); | |
1653 | return status; | |
1654 | } | |
1655 | ||
21666f1a | 1656 | int sha1_object_info(const unsigned char *sha1, unsigned long *sizep) |
f0df4ed5 | 1657 | { |
f0df4ed5 JS |
1658 | struct pack_entry e; |
1659 | ||
1660 | if (!find_pack_entry(sha1, &e, NULL)) { | |
1661 | reprepare_packed_git(); | |
1662 | if (!find_pack_entry(sha1, &e, NULL)) | |
21666f1a | 1663 | return sha1_loose_object_info(sha1, sizep); |
f0df4ed5 | 1664 | } |
21666f1a | 1665 | return packed_object_info(e.p, e.offset, sizep); |
f0df4ed5 JS |
1666 | } |
1667 | ||
21666f1a NP |
1668 | static void *read_packed_sha1(const unsigned char *sha1, |
1669 | enum object_type *type, unsigned long *size) | |
1f688557 JH |
1670 | { |
1671 | struct pack_entry e; | |
1672 | ||
8276c007 | 1673 | if (!find_pack_entry(sha1, &e, NULL)) |
1f688557 | 1674 | return NULL; |
8276c007 | 1675 | else |
a0cba108 | 1676 | return cache_or_unpack_entry(e.p, e.offset, size, type, 1); |
1f688557 JH |
1677 | } |
1678 | ||
d66b37bb JH |
1679 | /* |
1680 | * This is meant to hold a *small* number of objects that you would | |
1681 | * want read_sha1_file() to be able to return, but yet you do not want | |
1682 | * to write them into the object store (e.g. a browse-only | |
1683 | * application). | |
1684 | */ | |
1685 | static struct cached_object { | |
1686 | unsigned char sha1[20]; | |
21666f1a | 1687 | enum object_type type; |
d66b37bb JH |
1688 | void *buf; |
1689 | unsigned long size; | |
1690 | } *cached_objects; | |
1691 | static int cached_object_nr, cached_object_alloc; | |
1692 | ||
1693 | static struct cached_object *find_cached_object(const unsigned char *sha1) | |
1694 | { | |
1695 | int i; | |
1696 | struct cached_object *co = cached_objects; | |
1697 | ||
1698 | for (i = 0; i < cached_object_nr; i++, co++) { | |
1699 | if (!hashcmp(co->sha1, sha1)) | |
1700 | return co; | |
1701 | } | |
1702 | return NULL; | |
1703 | } | |
1704 | ||
21666f1a NP |
1705 | int pretend_sha1_file(void *buf, unsigned long len, enum object_type type, |
1706 | unsigned char *sha1) | |
d66b37bb JH |
1707 | { |
1708 | struct cached_object *co; | |
1709 | ||
21666f1a | 1710 | hash_sha1_file(buf, len, typename(type), sha1); |
d66b37bb JH |
1711 | if (has_sha1_file(sha1) || find_cached_object(sha1)) |
1712 | return 0; | |
1713 | if (cached_object_alloc <= cached_object_nr) { | |
1714 | cached_object_alloc = alloc_nr(cached_object_alloc); | |
1715 | cached_objects = xrealloc(cached_objects, | |
1716 | sizeof(*cached_objects) * | |
1717 | cached_object_alloc); | |
1718 | } | |
1719 | co = &cached_objects[cached_object_nr++]; | |
1720 | co->size = len; | |
21666f1a | 1721 | co->type = type; |
efa13f7b JH |
1722 | co->buf = xmalloc(len); |
1723 | memcpy(co->buf, buf, len); | |
d66b37bb JH |
1724 | hashcpy(co->sha1, sha1); |
1725 | return 0; | |
1726 | } | |
1727 | ||
21666f1a NP |
1728 | void *read_sha1_file(const unsigned char *sha1, enum object_type *type, |
1729 | unsigned long *size) | |
0fcfd160 LT |
1730 | { |
1731 | unsigned long mapsize; | |
1732 | void *map, *buf; | |
d66b37bb JH |
1733 | struct cached_object *co; |
1734 | ||
1735 | co = find_cached_object(sha1); | |
1736 | if (co) { | |
1737 | buf = xmalloc(co->size + 1); | |
1738 | memcpy(buf, co->buf, co->size); | |
1739 | ((char*)buf)[co->size] = 0; | |
21666f1a | 1740 | *type = co->type; |
d66b37bb JH |
1741 | *size = co->size; |
1742 | return buf; | |
1743 | } | |
0fcfd160 | 1744 | |
8276c007 PE |
1745 | buf = read_packed_sha1(sha1, type, size); |
1746 | if (buf) | |
1747 | return buf; | |
bb6b8e4f | 1748 | map = map_sha1_file(sha1, &mapsize); |
0fcfd160 | 1749 | if (map) { |
7efbff75 | 1750 | buf = unpack_sha1_file(map, mapsize, type, size, sha1); |
0fcfd160 LT |
1751 | munmap(map, mapsize); |
1752 | return buf; | |
1753 | } | |
637cdd9d | 1754 | reprepare_packed_git(); |
8276c007 | 1755 | return read_packed_sha1(sha1, type, size); |
0fcfd160 LT |
1756 | } |
1757 | ||
40469ee9 | 1758 | void *read_object_with_reference(const unsigned char *sha1, |
21666f1a | 1759 | const char *required_type_name, |
40469ee9 JH |
1760 | unsigned long *size, |
1761 | unsigned char *actual_sha1_return) | |
f4913f91 | 1762 | { |
21666f1a | 1763 | enum object_type type, required_type; |
f4913f91 JH |
1764 | void *buffer; |
1765 | unsigned long isize; | |
40469ee9 | 1766 | unsigned char actual_sha1[20]; |
f4913f91 | 1767 | |
21666f1a | 1768 | required_type = type_from_string(required_type_name); |
e702496e | 1769 | hashcpy(actual_sha1, sha1); |
40469ee9 JH |
1770 | while (1) { |
1771 | int ref_length = -1; | |
1772 | const char *ref_type = NULL; | |
f4913f91 | 1773 | |
21666f1a | 1774 | buffer = read_sha1_file(actual_sha1, &type, &isize); |
40469ee9 JH |
1775 | if (!buffer) |
1776 | return NULL; | |
21666f1a | 1777 | if (type == required_type) { |
40469ee9 JH |
1778 | *size = isize; |
1779 | if (actual_sha1_return) | |
e702496e | 1780 | hashcpy(actual_sha1_return, actual_sha1); |
40469ee9 JH |
1781 | return buffer; |
1782 | } | |
1783 | /* Handle references */ | |
21666f1a | 1784 | else if (type == OBJ_COMMIT) |
40469ee9 | 1785 | ref_type = "tree "; |
21666f1a | 1786 | else if (type == OBJ_TAG) |
40469ee9 JH |
1787 | ref_type = "object "; |
1788 | else { | |
1789 | free(buffer); | |
1790 | return NULL; | |
1791 | } | |
1792 | ref_length = strlen(ref_type); | |
f4913f91 | 1793 | |
40469ee9 | 1794 | if (memcmp(buffer, ref_type, ref_length) || |
1d7f171c | 1795 | get_sha1_hex((char *) buffer + ref_length, actual_sha1)) { |
40469ee9 JH |
1796 | free(buffer); |
1797 | return NULL; | |
1798 | } | |
1cf58e72 | 1799 | free(buffer); |
40469ee9 JH |
1800 | /* Now we have the ID of the referred-to object in |
1801 | * actual_sha1. Check again. */ | |
f4913f91 | 1802 | } |
f4913f91 JH |
1803 | } |
1804 | ||
ce9fbf16 | 1805 | static void write_sha1_file_prepare(const void *buf, unsigned long len, |
972a9155 | 1806 | const char *type, unsigned char *sha1, |
d65a16f6 | 1807 | char *hdr, int *hdrlen) |
d410c0f5 JH |
1808 | { |
1809 | SHA_CTX c; | |
1810 | ||
1811 | /* Generate the header */ | |
d65a16f6 | 1812 | *hdrlen = sprintf(hdr, "%s %lu", type, len)+1; |
d410c0f5 JH |
1813 | |
1814 | /* Sha1.. */ | |
1815 | SHA1_Init(&c); | |
1816 | SHA1_Update(&c, hdr, *hdrlen); | |
1817 | SHA1_Update(&c, buf, len); | |
1818 | SHA1_Final(sha1, &c); | |
d410c0f5 JH |
1819 | } |
1820 | ||
230f1322 LT |
1821 | /* |
1822 | * Link the tempfile to the final place, possibly creating the | |
1823 | * last directory level as you do so. | |
1824 | * | |
1825 | * Returns the errno on failure, 0 on success. | |
1826 | */ | |
839837b9 | 1827 | static int link_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1828 | { |
1829 | int ret; | |
756aaf4a | 1830 | char *dir; |
230f1322 LT |
1831 | |
1832 | if (!link(tmpfile, filename)) | |
1833 | return 0; | |
1834 | ||
1835 | /* | |
756aaf4a | 1836 | * Try to mkdir the last path component if that failed. |
230f1322 LT |
1837 | * |
1838 | * Re-try the "link()" regardless of whether the mkdir | |
1839 | * succeeds, since a race might mean that somebody | |
1840 | * else succeeded. | |
1841 | */ | |
1842 | ret = errno; | |
756aaf4a SP |
1843 | dir = strrchr(filename, '/'); |
1844 | if (dir) { | |
1845 | *dir = 0; | |
866cae0d | 1846 | if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) { |
91c23e48 | 1847 | *dir = '/'; |
756aaf4a | 1848 | return -2; |
91c23e48 | 1849 | } |
756aaf4a SP |
1850 | *dir = '/'; |
1851 | if (!link(tmpfile, filename)) | |
1852 | return 0; | |
1853 | ret = errno; | |
230f1322 LT |
1854 | } |
1855 | return ret; | |
1856 | } | |
1857 | ||
1858 | /* | |
1859 | * Move the just written object into its final resting place | |
1860 | */ | |
839837b9 | 1861 | int move_temp_to_file(const char *tmpfile, const char *filename) |
230f1322 LT |
1862 | { |
1863 | int ret = link_temp_to_file(tmpfile, filename); | |
7ebb6fca LT |
1864 | |
1865 | /* | |
1866 | * Coda hack - coda doesn't like cross-directory links, | |
1867 | * so we fall back to a rename, which will mean that it | |
1868 | * won't be able to check collisions, but that's not a | |
1869 | * big deal. | |
1870 | * | |
1871 | * The same holds for FAT formatted media. | |
1872 | * | |
1873 | * When this succeeds, we just return 0. We have nothing | |
1874 | * left to unlink. | |
1875 | */ | |
1876 | if (ret && ret != EEXIST) { | |
1877 | if (!rename(tmpfile, filename)) | |
230f1322 | 1878 | return 0; |
9e48b389 | 1879 | ret = errno; |
230f1322 LT |
1880 | } |
1881 | unlink(tmpfile); | |
1882 | if (ret) { | |
1883 | if (ret != EEXIST) { | |
916d081b | 1884 | return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
230f1322 LT |
1885 | } |
1886 | /* FIXME!!! Collision check here ? */ | |
1887 | } | |
1888 | ||
1889 | return 0; | |
1890 | } | |
1891 | ||
4d548150 LT |
1892 | static int write_buffer(int fd, const void *buf, size_t len) |
1893 | { | |
d34cf19b | 1894 | if (write_in_full(fd, buf, len) < 0) |
93822c22 | 1895 | return error("file write error (%s)", strerror(errno)); |
4d548150 LT |
1896 | return 0; |
1897 | } | |
1898 | ||
93821bd9 LT |
1899 | static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len) |
1900 | { | |
1901 | int hdr_len; | |
1902 | unsigned char c; | |
1903 | ||
1904 | c = (type << 4) | (len & 15); | |
1905 | len >>= 4; | |
1906 | hdr_len = 1; | |
1907 | while (len) { | |
1908 | *hdr++ = c | 0x80; | |
1909 | hdr_len++; | |
1910 | c = (len & 0x7f); | |
1911 | len >>= 7; | |
1912 | } | |
1913 | *hdr = c; | |
1914 | return hdr_len; | |
1915 | } | |
1916 | ||
1917 | static void setup_object_header(z_stream *stream, const char *type, unsigned long len) | |
1918 | { | |
d65a16f6 | 1919 | int obj_type, hdrlen; |
93821bd9 LT |
1920 | |
1921 | if (use_legacy_headers) { | |
1922 | while (deflate(stream, 0) == Z_OK) | |
1923 | /* nothing */; | |
1924 | return; | |
1925 | } | |
df843662 | 1926 | obj_type = type_from_string(type); |
d65a16f6 NP |
1927 | hdrlen = write_binary_header(stream->next_out, obj_type, len); |
1928 | stream->total_out = hdrlen; | |
1929 | stream->next_out += hdrlen; | |
1930 | stream->avail_out -= hdrlen; | |
93821bd9 LT |
1931 | } |
1932 | ||
ce9fbf16 | 1933 | int hash_sha1_file(const void *buf, unsigned long len, const char *type, |
abdc3fc8 RS |
1934 | unsigned char *sha1) |
1935 | { | |
d65a16f6 | 1936 | char hdr[32]; |
abdc3fc8 RS |
1937 | int hdrlen; |
1938 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); | |
1939 | return 0; | |
1940 | } | |
1941 | ||
bf0f910d | 1942 | int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
0fcfd160 | 1943 | { |
ac54c277 | 1944 | int size, ret; |
bf0f910d | 1945 | unsigned char *compressed; |
0fcfd160 LT |
1946 | z_stream stream; |
1947 | unsigned char sha1[20]; | |
706bc531 | 1948 | char *filename; |
aac17941 | 1949 | static char tmpfile[PATH_MAX]; |
d65a16f6 | 1950 | char hdr[32]; |
230f1322 | 1951 | int fd, hdrlen; |
a44c9a5e | 1952 | |
d410c0f5 JH |
1953 | /* Normally if we have it in the pack then we do not bother writing |
1954 | * it out into .git/objects/??/?{38} file. | |
1955 | */ | |
972a9155 RS |
1956 | write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
1957 | filename = sha1_file_name(sha1); | |
706bc531 | 1958 | if (returnsha1) |
e702496e | 1959 | hashcpy(returnsha1, sha1); |
d410c0f5 JH |
1960 | if (has_sha1_file(sha1)) |
1961 | return 0; | |
aac17941 LT |
1962 | fd = open(filename, O_RDONLY); |
1963 | if (fd >= 0) { | |
706bc531 | 1964 | /* |
aac17941 LT |
1965 | * FIXME!!! We might do collision checking here, but we'd |
1966 | * need to uncompress the old file and check it. Later. | |
706bc531 | 1967 | */ |
aac17941 | 1968 | close(fd); |
706bc531 LT |
1969 | return 0; |
1970 | } | |
1971 | ||
aac17941 | 1972 | if (errno != ENOENT) { |
916d081b | 1973 | return error("sha1 file %s: %s\n", filename, strerror(errno)); |
aac17941 LT |
1974 | } |
1975 | ||
0e55181f | 1976 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
ace1534d | 1977 | |
aac17941 LT |
1978 | fd = mkstemp(tmpfile); |
1979 | if (fd < 0) { | |
916d081b PB |
1980 | if (errno == EPERM) |
1981 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
1982 | else | |
1983 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
aac17941 LT |
1984 | } |
1985 | ||
0fcfd160 LT |
1986 | /* Set it up */ |
1987 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 1988 | deflateInit(&stream, zlib_compression_level); |
93821bd9 | 1989 | size = 8 + deflateBound(&stream, len+hdrlen); |
812666c8 | 1990 | compressed = xmalloc(size); |
0fcfd160 LT |
1991 | |
1992 | /* Compress it */ | |
0fcfd160 LT |
1993 | stream.next_out = compressed; |
1994 | stream.avail_out = size; | |
a44c9a5e LT |
1995 | |
1996 | /* First header.. */ | |
d65a16f6 | 1997 | stream.next_in = (unsigned char *)hdr; |
a44c9a5e | 1998 | stream.avail_in = hdrlen; |
93821bd9 | 1999 | setup_object_header(&stream, type, len); |
a44c9a5e LT |
2000 | |
2001 | /* Then the data itself.. */ | |
2002 | stream.next_in = buf; | |
2003 | stream.avail_in = len; | |
ac54c277 LT |
2004 | ret = deflate(&stream, Z_FINISH); |
2005 | if (ret != Z_STREAM_END) | |
2006 | die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret); | |
2007 | ||
2008 | ret = deflateEnd(&stream); | |
2009 | if (ret != Z_OK) | |
2010 | die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret); | |
2011 | ||
0fcfd160 LT |
2012 | size = stream.total_out; |
2013 | ||
4d548150 LT |
2014 | if (write_buffer(fd, compressed, size) < 0) |
2015 | die("unable to write sha1 file"); | |
aac17941 | 2016 | fchmod(fd, 0444); |
e82973cf JH |
2017 | if (close(fd)) |
2018 | die("unable to write sha1 file"); | |
383f85b7 | 2019 | free(compressed); |
0fcfd160 | 2020 | |
230f1322 | 2021 | return move_temp_to_file(tmpfile, filename); |
0fcfd160 | 2022 | } |
8237b185 | 2023 | |
4d548150 LT |
2024 | /* |
2025 | * We need to unpack and recompress the object for writing | |
2026 | * it out to a different file. | |
2027 | */ | |
2028 | static void *repack_object(const unsigned char *sha1, unsigned long *objsize) | |
a5eda52b | 2029 | { |
4d548150 | 2030 | size_t size; |
a5eda52b | 2031 | z_stream stream; |
4d548150 LT |
2032 | unsigned char *unpacked; |
2033 | unsigned long len; | |
21666f1a | 2034 | enum object_type type; |
d65a16f6 | 2035 | char hdr[32]; |
4d548150 LT |
2036 | int hdrlen; |
2037 | void *buf; | |
bfc66daf | 2038 | |
a9486b02 | 2039 | /* need to unpack and recompress it by itself */ |
21666f1a | 2040 | unpacked = read_packed_sha1(sha1, &type, &len); |
8276c007 PE |
2041 | if (!unpacked) |
2042 | error("cannot read sha1_file for %s", sha1_to_hex(sha1)); | |
a5eda52b | 2043 | |
21666f1a | 2044 | hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1; |
a5eda52b | 2045 | |
4d548150 LT |
2046 | /* Set it up */ |
2047 | memset(&stream, 0, sizeof(stream)); | |
12f6c308 | 2048 | deflateInit(&stream, zlib_compression_level); |
4d548150 LT |
2049 | size = deflateBound(&stream, len + hdrlen); |
2050 | buf = xmalloc(size); | |
a5eda52b | 2051 | |
4d548150 LT |
2052 | /* Compress it */ |
2053 | stream.next_out = buf; | |
2054 | stream.avail_out = size; | |
a5eda52b | 2055 | |
4d548150 LT |
2056 | /* First header.. */ |
2057 | stream.next_in = (void *)hdr; | |
2058 | stream.avail_in = hdrlen; | |
2059 | while (deflate(&stream, 0) == Z_OK) | |
2060 | /* nothing */; | |
bfc66daf | 2061 | |
4d548150 LT |
2062 | /* Then the data itself.. */ |
2063 | stream.next_in = unpacked; | |
2064 | stream.avail_in = len; | |
2065 | while (deflate(&stream, Z_FINISH) == Z_OK) | |
2066 | /* nothing */; | |
2067 | deflateEnd(&stream); | |
2068 | free(unpacked); | |
bfc66daf | 2069 | |
4d548150 LT |
2070 | *objsize = stream.total_out; |
2071 | return buf; | |
2072 | } | |
2073 | ||
2074 | int write_sha1_to_fd(int fd, const unsigned char *sha1) | |
2075 | { | |
2076 | int retval; | |
2077 | unsigned long objsize; | |
bb6b8e4f | 2078 | void *buf = map_sha1_file(sha1, &objsize); |
4d548150 LT |
2079 | |
2080 | if (buf) { | |
2081 | retval = write_buffer(fd, buf, objsize); | |
2082 | munmap(buf, objsize); | |
2083 | return retval; | |
2084 | } | |
2085 | ||
2086 | buf = repack_object(sha1, &objsize); | |
2087 | retval = write_buffer(fd, buf, objsize); | |
2088 | free(buf); | |
2089 | return retval; | |
a5eda52b DB |
2090 | } |
2091 | ||
70b9829e DB |
2092 | int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
2093 | size_t bufsize, size_t *bufposn) | |
8237b185 | 2094 | { |
230f1322 | 2095 | char tmpfile[PATH_MAX]; |
8237b185 DB |
2096 | int local; |
2097 | z_stream stream; | |
2098 | unsigned char real_sha1[20]; | |
bf0f910d | 2099 | unsigned char discard[4096]; |
8237b185 DB |
2100 | int ret; |
2101 | SHA_CTX c; | |
2102 | ||
0e55181f | 2103 | snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory()); |
8237b185 | 2104 | |
230f1322 | 2105 | local = mkstemp(tmpfile); |
916d081b PB |
2106 | if (local < 0) { |
2107 | if (errno == EPERM) | |
2108 | return error("insufficient permission for adding an object to repository database %s\n", get_object_directory()); | |
2109 | else | |
2110 | return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); | |
2111 | } | |
8237b185 DB |
2112 | |
2113 | memset(&stream, 0, sizeof(stream)); | |
2114 | ||
2115 | inflateInit(&stream); | |
2116 | ||
2117 | SHA1_Init(&c); | |
2118 | ||
2119 | do { | |
2120 | ssize_t size; | |
70b9829e DB |
2121 | if (*bufposn) { |
2122 | stream.avail_in = *bufposn; | |
96ad15ae | 2123 | stream.next_in = (unsigned char *) buffer; |
70b9829e DB |
2124 | do { |
2125 | stream.next_out = discard; | |
2126 | stream.avail_out = sizeof(discard); | |
2127 | ret = inflate(&stream, Z_SYNC_FLUSH); | |
2128 | SHA1_Update(&c, discard, sizeof(discard) - | |
2129 | stream.avail_out); | |
2130 | } while (stream.avail_in && ret == Z_OK); | |
4d548150 LT |
2131 | if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0) |
2132 | die("unable to write sha1 file"); | |
70b9829e DB |
2133 | memmove(buffer, buffer + *bufposn - stream.avail_in, |
2134 | stream.avail_in); | |
2135 | *bufposn = stream.avail_in; | |
2136 | if (ret != Z_OK) | |
2137 | break; | |
2138 | } | |
93d26e4c | 2139 | size = xread(fd, buffer + *bufposn, bufsize - *bufposn); |
8237b185 DB |
2140 | if (size <= 0) { |
2141 | close(local); | |
230f1322 | 2142 | unlink(tmpfile); |
8237b185 DB |
2143 | if (!size) |
2144 | return error("Connection closed?"); | |
2145 | perror("Reading from connection"); | |
2146 | return -1; | |
2147 | } | |
70b9829e DB |
2148 | *bufposn += size; |
2149 | } while (1); | |
8237b185 DB |
2150 | inflateEnd(&stream); |
2151 | ||
b5b8d814 | 2152 | fchmod(local, 0444); |
0d315468 JM |
2153 | if (close(local) != 0) |
2154 | die("unable to write sha1 file"); | |
8237b185 DB |
2155 | SHA1_Final(real_sha1, &c); |
2156 | if (ret != Z_STREAM_END) { | |
230f1322 | 2157 | unlink(tmpfile); |
8237b185 DB |
2158 | return error("File %s corrupted", sha1_to_hex(sha1)); |
2159 | } | |
a89fccd2 | 2160 | if (hashcmp(sha1, real_sha1)) { |
230f1322 | 2161 | unlink(tmpfile); |
bd2afde8 | 2162 | return error("File %s has bad hash", sha1_to_hex(sha1)); |
8237b185 | 2163 | } |
230f1322 LT |
2164 | |
2165 | return move_temp_to_file(tmpfile, sha1_file_name(sha1)); | |
8237b185 DB |
2166 | } |
2167 | ||
bf592c50 DB |
2168 | int has_pack_index(const unsigned char *sha1) |
2169 | { | |
2170 | struct stat st; | |
2171 | if (stat(sha1_pack_index_name(sha1), &st)) | |
2172 | return 0; | |
2173 | return 1; | |
2174 | } | |
2175 | ||
2176 | int has_pack_file(const unsigned char *sha1) | |
2177 | { | |
2178 | struct stat st; | |
2179 | if (stat(sha1_pack_name(sha1), &st)) | |
2180 | return 0; | |
2181 | return 1; | |
2182 | } | |
2183 | ||
106d710b | 2184 | int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed) |
dade09c2 LT |
2185 | { |
2186 | struct pack_entry e; | |
106d710b | 2187 | return find_pack_entry(sha1, &e, ignore_packed); |
dade09c2 LT |
2188 | } |
2189 | ||
8237b185 DB |
2190 | int has_sha1_file(const unsigned char *sha1) |
2191 | { | |
8237b185 | 2192 | struct stat st; |
1f688557 JH |
2193 | struct pack_entry e; |
2194 | ||
106d710b | 2195 | if (find_pack_entry(sha1, &e, NULL)) |
1f688557 | 2196 | return 1; |
ab90ea5d | 2197 | return find_sha1_file(sha1, &st) ? 1 : 0; |
8237b185 | 2198 | } |
74400e71 | 2199 | |
e7332f96 BE |
2200 | /* |
2201 | * reads from fd as long as possible into a supplied buffer of size bytes. | |
82e5a82f | 2202 | * If necessary the buffer's size is increased using realloc() |
e7332f96 BE |
2203 | * |
2204 | * returns 0 if anything went fine and -1 otherwise | |
2205 | * | |
2206 | * NOTE: both buf and size may change, but even when -1 is returned | |
2207 | * you still have to free() it yourself. | |
2208 | */ | |
2209 | int read_pipe(int fd, char** return_buf, unsigned long* return_size) | |
024510c8 | 2210 | { |
e7332f96 BE |
2211 | char* buf = *return_buf; |
2212 | unsigned long size = *return_size; | |
2213 | int iret; | |
024510c8 | 2214 | unsigned long off = 0; |
e7332f96 | 2215 | |
024510c8 | 2216 | do { |
e7332f96 | 2217 | iret = xread(fd, buf + off, size - off); |
024510c8 DB |
2218 | if (iret > 0) { |
2219 | off += iret; | |
2220 | if (off == size) { | |
2221 | size *= 2; | |
83572c1a | 2222 | buf = xrealloc(buf, size); |
024510c8 DB |
2223 | } |
2224 | } | |
2225 | } while (iret > 0); | |
e7332f96 BE |
2226 | |
2227 | *return_buf = buf; | |
2228 | *return_size = off; | |
2229 | ||
2230 | if (iret < 0) | |
2231 | return -1; | |
2232 | return 0; | |
2233 | } | |
2234 | ||
2235 | int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) | |
2236 | { | |
2237 | unsigned long size = 4096; | |
2d7320d0 | 2238 | char *buf = xmalloc(size); |
e7332f96 | 2239 | int ret; |
e7332f96 BE |
2240 | |
2241 | if (read_pipe(fd, &buf, &size)) { | |
024510c8 DB |
2242 | free(buf); |
2243 | return -1; | |
2244 | } | |
e7332f96 | 2245 | |
024510c8 | 2246 | if (!type) |
8e440259 | 2247 | type = blob_type; |
024510c8 | 2248 | if (write_object) |
e7332f96 | 2249 | ret = write_sha1_file(buf, size, type, sha1); |
abdc3fc8 RS |
2250 | else |
2251 | ret = hash_sha1_file(buf, size, type, sha1); | |
024510c8 DB |
2252 | free(buf); |
2253 | return ret; | |
2254 | } | |
2255 | ||
edaec3fb | 2256 | int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, |
53bca91a | 2257 | enum object_type type, const char *path) |
74400e71 | 2258 | { |
dc49cd76 | 2259 | size_t size = xsize_t(st->st_size); |
3a55602e | 2260 | void *buf = NULL; |
6c510bee | 2261 | int ret, re_allocated = 0; |
74400e71 | 2262 | |
74400e71 | 2263 | if (size) |
c4712e45 | 2264 | buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
74400e71 | 2265 | close(fd); |
74400e71 | 2266 | |
7672db20 | 2267 | if (!type) |
edaec3fb | 2268 | type = OBJ_BLOB; |
6c510bee LT |
2269 | |
2270 | /* | |
2271 | * Convert blobs to git internal format | |
2272 | */ | |
d0d8e14d | 2273 | if ((type == OBJ_BLOB) && S_ISREG(st->st_mode)) { |
6c510bee LT |
2274 | unsigned long nsize = size; |
2275 | char *nbuf = buf; | |
53bca91a | 2276 | if (convert_to_git(path, &nbuf, &nsize)) { |
6c510bee LT |
2277 | if (size) |
2278 | munmap(buf, size); | |
2279 | size = nsize; | |
2280 | buf = nbuf; | |
2281 | re_allocated = 1; | |
2282 | } | |
2283 | } | |
2284 | ||
7672db20 | 2285 | if (write_object) |
edaec3fb | 2286 | ret = write_sha1_file(buf, size, typename(type), sha1); |
abdc3fc8 | 2287 | else |
edaec3fb | 2288 | ret = hash_sha1_file(buf, size, typename(type), sha1); |
6c510bee LT |
2289 | if (re_allocated) { |
2290 | free(buf); | |
2291 | return ret; | |
2292 | } | |
aac17941 LT |
2293 | if (size) |
2294 | munmap(buf, size); | |
2295 | return ret; | |
74400e71 | 2296 | } |
ec1fcc16 JH |
2297 | |
2298 | int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) | |
2299 | { | |
2300 | int fd; | |
2301 | char *target; | |
dc49cd76 | 2302 | size_t len; |
ec1fcc16 JH |
2303 | |
2304 | switch (st->st_mode & S_IFMT) { | |
2305 | case S_IFREG: | |
2306 | fd = open(path, O_RDONLY); | |
2307 | if (fd < 0) | |
2308 | return error("open(\"%s\"): %s", path, | |
2309 | strerror(errno)); | |
53bca91a | 2310 | if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0) |
ec1fcc16 JH |
2311 | return error("%s: failed to insert into database", |
2312 | path); | |
2313 | break; | |
2314 | case S_IFLNK: | |
dc49cd76 SP |
2315 | len = xsize_t(st->st_size); |
2316 | target = xmalloc(len + 1); | |
2317 | if (readlink(path, target, len + 1) != st->st_size) { | |
ec1fcc16 JH |
2318 | char *errstr = strerror(errno); |
2319 | free(target); | |
2320 | return error("readlink(\"%s\"): %s", path, | |
2321 | errstr); | |
2322 | } | |
abdc3fc8 | 2323 | if (!write_object) |
dc49cd76 SP |
2324 | hash_sha1_file(target, len, blob_type, sha1); |
2325 | else if (write_sha1_file(target, len, blob_type, sha1)) | |
ec1fcc16 JH |
2326 | return error("%s: failed to insert into database", |
2327 | path); | |
2328 | free(target); | |
2329 | break; | |
2330 | default: | |
2331 | return error("%s: unsupported file type", path); | |
2332 | } | |
2333 | return 0; | |
2334 | } | |
a69e5429 JH |
2335 | |
2336 | int read_pack_header(int fd, struct pack_header *header) | |
2337 | { | |
2338 | char *c = (char*)header; | |
2339 | ssize_t remaining = sizeof(struct pack_header); | |
2340 | do { | |
2341 | ssize_t r = xread(fd, c, remaining); | |
2342 | if (r <= 0) | |
2343 | /* "eof before pack header was fully read" */ | |
2344 | return PH_ERROR_EOF; | |
2345 | remaining -= r; | |
2346 | c += r; | |
2347 | } while (remaining > 0); | |
2348 | if (header->hdr_signature != htonl(PACK_SIGNATURE)) | |
2349 | /* "protocol error (pack signature mismatch detected)" */ | |
2350 | return PH_ERROR_PACK_SIGNATURE; | |
2351 | if (!pack_version_ok(header->hdr_version)) | |
2352 | /* "protocol error (pack version unsupported)" */ | |
2353 | return PH_ERROR_PROTOCOL; | |
2354 | return 0; | |
2355 | } |