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Commit | Line | Data |
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9282e921 | 1 | /* |
2 | * This file is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License, version 2, | |
4 | * as published by the Free Software Foundation. | |
5 | * | |
6 | * In addition to the permissions in the GNU General Public License, | |
7 | * the authors give you unlimited permission to link the compiled | |
8 | * version of this file into combinations with other programs, | |
9 | * and to distribute those combinations without any restriction | |
10 | * coming from the use of this file. (The General Public License | |
11 | * restrictions do apply in other respects; for example, they cover | |
12 | * modification of the file, and distribution when not linked into | |
13 | * a combined executable.) | |
14 | * | |
15 | * This file is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; see the file COPYING. If not, write to | |
22 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, | |
23 | * Boston, MA 02110-1301, USA. | |
24 | */ | |
25 | ||
26 | #include "refs.h" | |
27 | #include "hash.h" | |
28 | #include "repository.h" | |
29 | #include "fileops.h" | |
30 | ||
87d3acf4 VM |
31 | #include <git2/tag.h> |
32 | #include <git2/object.h> | |
33 | ||
9282e921 | 34 | #define MAX_NESTING_LEVEL 5 |
35 | ||
86194b24 VM |
36 | typedef struct { |
37 | git_reference ref; | |
38 | git_oid oid; | |
39 | git_oid peel_target; | |
40 | } reference_oid; | |
41 | ||
42 | typedef struct { | |
43 | git_reference ref; | |
44 | char *target; | |
45 | } reference_symbolic; | |
46 | ||
9282e921 | 47 | static const int default_table_size = 32; |
48 | ||
fc658755 | 49 | static uint32_t reftable_hash(const void *key, int hash_id) |
9282e921 | 50 | { |
fc658755 VM |
51 | static uint32_t hash_seeds[GIT_HASHTABLE_HASHES] = { |
52 | 2147483647, | |
53 | 0x5d20bb23, | |
932d1baf | 54 | 0x7daaab3c |
fc658755 | 55 | }; |
9282e921 | 56 | |
fc658755 | 57 | return git__hash(key, strlen((const char *)key), hash_seeds[hash_id]); |
9282e921 | 58 | } |
59 | ||
87d3acf4 VM |
60 | static void reference_free(git_reference *reference); |
61 | static int reference_create(git_reference **ref_out, git_repository *repo, const char *name, git_rtype type); | |
f79026b4 | 62 | static int reference_read(git_fbuffer *file_content, time_t *mtime, const char *repo_path, const char *ref_name); |
87d3acf4 VM |
63 | |
64 | /* loose refs */ | |
f79026b4 VM |
65 | static int loose_parse_symbolic(git_reference *ref, git_fbuffer *file_content); |
66 | static int loose_parse_oid(git_reference *ref, git_fbuffer *file_content); | |
7341bf87 | 67 | static int loose_lookup(git_reference **ref_out, git_repository *repo, const char *name, int skip_symbolic); |
87d3acf4 | 68 | static int loose_write(git_reference *ref); |
7341bf87 | 69 | static int loose_update(git_reference *ref); |
87d3acf4 VM |
70 | |
71 | /* packed refs */ | |
87d3acf4 VM |
72 | static int packed_parse_peel(reference_oid *tag_ref, const char **buffer_out, const char *buffer_end); |
73 | static int packed_parse_oid(reference_oid **ref_out, git_repository *repo, const char **buffer_out, const char *buffer_end); | |
74 | static int packed_load(git_repository *repo); | |
75 | static int packed_loadloose(git_repository *repository); | |
76 | static int packed_write_ref(reference_oid *ref, git_filebuf *file); | |
77 | static int packed_find_peel(reference_oid *ref); | |
78 | static int packed_remove_loose(git_repository *repo, git_vector *packing_list); | |
79 | static int packed_sort(const void *a, const void *b); | |
80 | static int packed_write(git_repository *repo); | |
81 | ||
95cde17c | 82 | /* internal helpers */ |
1b6d8163 | 83 | static int reference_available(git_repository *repo, const char *ref, const char *old_ref); |
95cde17c | 84 | |
87d3acf4 VM |
85 | /* name normalization */ |
86 | static int check_valid_ref_char(char ch); | |
3101a3e5 | 87 | static int normalize_name(char *buffer_out, size_t out_size, const char *name, int is_oid_ref); |
87d3acf4 VM |
88 | |
89 | /***************************************** | |
90 | * Internal methods - Constructor/destructor | |
91 | *****************************************/ | |
2f8a8ab2 | 92 | static void reference_free(git_reference *reference) |
9282e921 | 93 | { |
2f8a8ab2 VM |
94 | if (reference == NULL) |
95 | return; | |
9282e921 | 96 | |
2f8a8ab2 VM |
97 | if (reference->name) |
98 | free(reference->name); | |
9282e921 | 99 | |
2f8a8ab2 | 100 | if (reference->type == GIT_REF_SYMBOLIC) |
86194b24 | 101 | free(((reference_symbolic *)reference)->target); |
9282e921 | 102 | |
2f8a8ab2 | 103 | free(reference); |
9282e921 | 104 | } |
105 | ||
87d3acf4 VM |
106 | static int reference_create( |
107 | git_reference **ref_out, | |
108 | git_repository *repo, | |
109 | const char *name, | |
110 | git_rtype type) | |
111 | { | |
3101a3e5 | 112 | char normalized[GIT_REFNAME_MAX]; |
86194b24 | 113 | int error = GIT_SUCCESS, size; |
9282e921 | 114 | git_reference *reference = NULL; |
115 | ||
1d8cc731 | 116 | assert(ref_out && repo && name); |
117 | ||
86194b24 VM |
118 | if (type == GIT_REF_SYMBOLIC) |
119 | size = sizeof(reference_symbolic); | |
120 | else if (type == GIT_REF_OID) | |
121 | size = sizeof(reference_oid); | |
122 | else | |
fa59f18d VM |
123 | return git__throw(GIT_EINVALIDARGS, |
124 | "Invalid reference type. Use either GIT_REF_OID or GIT_REF_SYMBOLIC as type specifier"); | |
9282e921 | 125 | |
86194b24 | 126 | reference = git__malloc(size); |
9282e921 | 127 | if (reference == NULL) |
128 | return GIT_ENOMEM; | |
129 | ||
86194b24 | 130 | memset(reference, 0x0, size); |
2f8a8ab2 | 131 | reference->owner = repo; |
1d8cc731 | 132 | reference->type = type; |
133 | ||
3101a3e5 | 134 | error = normalize_name(normalized, sizeof(normalized), name, (type & GIT_REF_OID)); |
1d8cc731 | 135 | if (error < GIT_SUCCESS) |
136 | goto cleanup; | |
137 | ||
138 | reference->name = git__strdup(normalized); | |
139 | if (reference->name == NULL) { | |
140 | error = GIT_ENOMEM; | |
141 | goto cleanup; | |
142 | } | |
9282e921 | 143 | |
2f8a8ab2 | 144 | *ref_out = reference; |
1d8cc731 | 145 | |
5bdf7b9f | 146 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create reference"); |
1d8cc731 | 147 | |
148 | cleanup: | |
149 | reference_free(reference); | |
5bdf7b9f | 150 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create reference"); |
1d8cc731 | 151 | } |
152 | ||
f79026b4 | 153 | static int reference_read(git_fbuffer *file_content, time_t *mtime, const char *repo_path, const char *ref_name) |
7341bf87 VM |
154 | { |
155 | struct stat st; | |
156 | char path[GIT_PATH_MAX]; | |
157 | ||
158 | /* Determine the full path of the file */ | |
f79026b4 | 159 | git_path_join(path, repo_path, ref_name); |
7341bf87 | 160 | |
f79026b4 | 161 | if (p_stat(path, &st) < 0 || S_ISDIR(st.st_mode)) |
fa59f18d VM |
162 | return git__throw(GIT_ENOTFOUND, |
163 | "Cannot read reference file '%s'", ref_name); | |
7341bf87 VM |
164 | |
165 | if (mtime) | |
166 | *mtime = st.st_mtime; | |
167 | ||
168 | if (file_content) | |
f79026b4 | 169 | return git_futils_readbuffer(file_content, path); |
7341bf87 VM |
170 | |
171 | return GIT_SUCCESS; | |
172 | } | |
173 | ||
1d8cc731 | 174 | |
1d8cc731 | 175 | |
9282e921 | 176 | |
87d3acf4 VM |
177 | /***************************************** |
178 | * Internal methods - Loose references | |
179 | *****************************************/ | |
7341bf87 VM |
180 | static int loose_update(git_reference *ref) |
181 | { | |
182 | int error; | |
183 | time_t ref_time; | |
f79026b4 | 184 | git_fbuffer ref_file = GIT_FBUFFER_INIT; |
7341bf87 VM |
185 | |
186 | if (ref->type & GIT_REF_PACKED) | |
187 | return packed_load(ref->owner); | |
188 | ||
189 | error = reference_read(NULL, &ref_time, ref->owner->path_repository, ref->name); | |
190 | if (error < GIT_SUCCESS) | |
191 | goto cleanup; | |
192 | ||
193 | if (ref_time == ref->mtime) | |
194 | return GIT_SUCCESS; | |
195 | ||
196 | error = reference_read(&ref_file, &ref->mtime, ref->owner->path_repository, ref->name); | |
197 | if (error < GIT_SUCCESS) | |
198 | goto cleanup; | |
199 | ||
200 | if (ref->type == GIT_REF_SYMBOLIC) | |
201 | error = loose_parse_symbolic(ref, &ref_file); | |
202 | else if (ref->type == GIT_REF_OID) | |
203 | error = loose_parse_oid(ref, &ref_file); | |
204 | else | |
fa59f18d VM |
205 | error = git__throw(GIT_EOBJCORRUPTED, |
206 | "Invalid reference type (%d) for loose reference", ref->type); | |
7341bf87 | 207 | |
f79026b4 | 208 | git_futils_freebuffer(&ref_file); |
7341bf87 VM |
209 | |
210 | cleanup: | |
211 | if (error != GIT_SUCCESS) { | |
212 | reference_free(ref); | |
213 | git_hashtable_remove(ref->owner->references.loose_cache, ref->name); | |
214 | } | |
215 | ||
5bdf7b9f | 216 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to update loose reference"); |
7341bf87 VM |
217 | } |
218 | ||
f79026b4 | 219 | static int loose_parse_symbolic(git_reference *ref, git_fbuffer *file_content) |
2f8a8ab2 | 220 | { |
ddc9e79a | 221 | const unsigned int header_len = strlen(GIT_SYMREF); |
2f8a8ab2 VM |
222 | const char *refname_start; |
223 | char *eol; | |
86194b24 | 224 | reference_symbolic *ref_sym; |
9282e921 | 225 | |
2f8a8ab2 | 226 | refname_start = (const char *)file_content->data; |
86194b24 | 227 | ref_sym = (reference_symbolic *)ref; |
9282e921 | 228 | |
2f8a8ab2 | 229 | if (file_content->len < (header_len + 1)) |
fa59f18d VM |
230 | return git__throw(GIT_EOBJCORRUPTED, |
231 | "Failed to parse loose reference. Object too short"); | |
9282e921 | 232 | |
932d1baf | 233 | /* |
2f8a8ab2 | 234 | * Assume we have already checked for the header |
932d1baf | 235 | * before calling this function |
2f8a8ab2 | 236 | */ |
9282e921 | 237 | |
2f8a8ab2 | 238 | refname_start += header_len; |
9282e921 | 239 | |
7341bf87 | 240 | free(ref_sym->target); |
86194b24 VM |
241 | ref_sym->target = git__strdup(refname_start); |
242 | if (ref_sym->target == NULL) | |
32054c24 | 243 | return GIT_ENOMEM; |
9282e921 | 244 | |
2f8a8ab2 | 245 | /* remove newline at the end of file */ |
86194b24 | 246 | eol = strchr(ref_sym->target, '\n'); |
ff5873ad | 247 | if (eol == NULL) |
fa59f18d VM |
248 | return git__throw(GIT_EOBJCORRUPTED, |
249 | "Failed to parse loose reference. Missing EOL"); | |
ff5873ad VM |
250 | |
251 | *eol = '\0'; | |
252 | if (eol[-1] == '\r') | |
253 | eol[-1] = '\0'; | |
9282e921 | 254 | |
2f8a8ab2 | 255 | return GIT_SUCCESS; |
9282e921 | 256 | } |
257 | ||
f79026b4 | 258 | static int loose_parse_oid(git_reference *ref, git_fbuffer *file_content) |
2f8a8ab2 | 259 | { |
fa59f18d | 260 | int error; |
86194b24 | 261 | reference_oid *ref_oid; |
2f8a8ab2 | 262 | char *buffer; |
86194b24 | 263 | |
2f8a8ab2 | 264 | buffer = (char *)file_content->data; |
86194b24 | 265 | ref_oid = (reference_oid *)ref; |
9282e921 | 266 | |
2f8a8ab2 | 267 | /* File format: 40 chars (OID) + newline */ |
ff5873ad | 268 | if (file_content->len < GIT_OID_HEXSZ + 1) |
fa59f18d VM |
269 | return git__throw(GIT_EOBJCORRUPTED, |
270 | "Failed to parse loose reference. Reference too short"); | |
9282e921 | 271 | |
fa48608e | 272 | if ((error = git_oid_fromstr(&ref_oid->oid, buffer)) < GIT_SUCCESS) |
fa59f18d | 273 | return git__rethrow(GIT_EOBJCORRUPTED, "Failed to parse loose reference."); |
9282e921 | 274 | |
ff5873ad VM |
275 | buffer = buffer + GIT_OID_HEXSZ; |
276 | if (*buffer == '\r') | |
277 | buffer++; | |
278 | ||
279 | if (*buffer != '\n') | |
fa59f18d VM |
280 | return git__throw(GIT_EOBJCORRUPTED, |
281 | "Failed to parse loose reference. Missing EOL"); | |
9282e921 | 282 | |
2f8a8ab2 | 283 | return GIT_SUCCESS; |
9282e921 | 284 | } |
285 | ||
9282e921 | 286 | |
00571828 VM |
287 | static git_rtype loose_guess_rtype(const char *full_path) |
288 | { | |
f79026b4 | 289 | git_fbuffer ref_file = GIT_FBUFFER_INIT; |
00571828 VM |
290 | git_rtype type; |
291 | ||
292 | type = GIT_REF_INVALID; | |
293 | ||
f79026b4 | 294 | if (git_futils_readbuffer(&ref_file, full_path) == GIT_SUCCESS) { |
00571828 VM |
295 | if (git__prefixcmp((const char *)(ref_file.data), GIT_SYMREF) == 0) |
296 | type = GIT_REF_SYMBOLIC; | |
297 | else | |
298 | type = GIT_REF_OID; | |
299 | } | |
300 | ||
f79026b4 | 301 | git_futils_freebuffer(&ref_file); |
00571828 VM |
302 | return type; |
303 | } | |
304 | ||
87d3acf4 | 305 | static int loose_lookup( |
932d1baf KS |
306 | git_reference **ref_out, |
307 | git_repository *repo, | |
87d3acf4 VM |
308 | const char *name, |
309 | int skip_symbolic) | |
9282e921 | 310 | { |
311 | int error = GIT_SUCCESS; | |
f79026b4 | 312 | git_fbuffer ref_file = GIT_FBUFFER_INIT; |
2f8a8ab2 | 313 | git_reference *ref = NULL; |
7341bf87 | 314 | time_t ref_time; |
9282e921 | 315 | |
2f8a8ab2 | 316 | *ref_out = NULL; |
9282e921 | 317 | |
7341bf87 | 318 | error = reference_read(&ref_file, &ref_time, repo->path_repository, name); |
9282e921 | 319 | if (error < GIT_SUCCESS) |
320 | goto cleanup; | |
321 | ||
1d8cc731 | 322 | if (git__prefixcmp((const char *)(ref_file.data), GIT_SYMREF) == 0) { |
87d3acf4 VM |
323 | if (skip_symbolic) |
324 | return GIT_SUCCESS; | |
325 | ||
32054c24 | 326 | error = reference_create(&ref, repo, name, GIT_REF_SYMBOLIC); |
1d8cc731 | 327 | if (error < GIT_SUCCESS) |
328 | goto cleanup; | |
9282e921 | 329 | |
87d3acf4 | 330 | error = loose_parse_symbolic(ref, &ref_file); |
1d8cc731 | 331 | } else { |
32054c24 | 332 | error = reference_create(&ref, repo, name, GIT_REF_OID); |
1d8cc731 | 333 | if (error < GIT_SUCCESS) |
334 | goto cleanup; | |
335 | ||
87d3acf4 | 336 | error = loose_parse_oid(ref, &ref_file); |
1d8cc731 | 337 | } |
338 | ||
ff5873ad VM |
339 | if (error < GIT_SUCCESS) |
340 | goto cleanup; | |
341 | ||
7341bf87 | 342 | ref->mtime = ref_time; |
2f8a8ab2 | 343 | *ref_out = ref; |
f79026b4 | 344 | git_futils_freebuffer(&ref_file); |
2f8a8ab2 | 345 | return GIT_SUCCESS; |
9282e921 | 346 | |
347 | cleanup: | |
f79026b4 | 348 | git_futils_freebuffer(&ref_file); |
2f8a8ab2 | 349 | reference_free(ref); |
5bdf7b9f | 350 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to lookup loose reference"); |
9282e921 | 351 | } |
352 | ||
87d3acf4 VM |
353 | static int loose_write(git_reference *ref) |
354 | { | |
355 | git_filebuf file; | |
356 | char ref_path[GIT_PATH_MAX]; | |
e7e0e20f | 357 | int error; |
7341bf87 | 358 | struct stat st; |
87d3acf4 | 359 | |
f79026b4 | 360 | git_path_join(ref_path, ref->owner->path_repository, ref->name); |
87d3acf4 | 361 | |
55ffebe3 | 362 | if ((error = git_filebuf_open(&file, ref_path, GIT_FILEBUF_FORCE)) < GIT_SUCCESS) |
5bdf7b9f | 363 | return git__rethrow(error, "Failed to write loose reference"); |
87d3acf4 VM |
364 | |
365 | if (ref->type & GIT_REF_OID) { | |
366 | reference_oid *ref_oid = (reference_oid *)ref; | |
e7e0e20f | 367 | char oid[GIT_OID_HEXSZ + 1]; |
87d3acf4 | 368 | |
e7e0e20f | 369 | memset(oid, 0x0, sizeof(oid)); |
87d3acf4 | 370 | |
e7e0e20f CMN |
371 | git_oid_fmt(oid, &ref_oid->oid); |
372 | error = git_filebuf_printf(&file, "%s\n", oid); | |
373 | if (error < GIT_SUCCESS) | |
374 | goto unlock; | |
87d3acf4 VM |
375 | |
376 | } else if (ref->type & GIT_REF_SYMBOLIC) { /* GIT_REF_SYMBOLIC */ | |
377 | reference_symbolic *ref_sym = (reference_symbolic *)ref; | |
378 | ||
e7e0e20f | 379 | error = git_filebuf_printf(&file, GIT_SYMREF "%s\n", ref_sym->target); |
87d3acf4 | 380 | } else { |
fa59f18d | 381 | error = git__throw(GIT_EOBJCORRUPTED, "Failed to write reference. Invalid reference type"); |
87d3acf4 VM |
382 | goto unlock; |
383 | } | |
384 | ||
87d3acf4 VM |
385 | error = git_filebuf_commit(&file); |
386 | ||
f79026b4 | 387 | if (p_stat(ref_path, &st) == GIT_SUCCESS) |
7341bf87 VM |
388 | ref->mtime = st.st_mtime; |
389 | ||
5bdf7b9f | 390 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write loose reference"); |
87d3acf4 VM |
391 | |
392 | unlock: | |
393 | git_filebuf_cleanup(&file); | |
5bdf7b9f | 394 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write loose reference"); |
87d3acf4 VM |
395 | } |
396 | ||
397 | ||
398 | ||
399 | ||
400 | ||
2f8a8ab2 | 401 | |
87d3acf4 VM |
402 | /***************************************** |
403 | * Internal methods - Packed references | |
404 | *****************************************/ | |
9282e921 | 405 | |
87d3acf4 | 406 | static int packed_parse_peel( |
86194b24 | 407 | reference_oid *tag_ref, |
932d1baf | 408 | const char **buffer_out, |
2f8a8ab2 | 409 | const char *buffer_end) |
9282e921 | 410 | { |
2f8a8ab2 VM |
411 | const char *buffer = *buffer_out + 1; |
412 | ||
413 | assert(buffer[-1] == '^'); | |
9282e921 | 414 | |
415 | /* Ensure it's not the first entry of the file */ | |
2f8a8ab2 | 416 | if (tag_ref == NULL) |
5bdf7b9f | 417 | return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Reference is the first entry of the file"); |
9282e921 | 418 | |
419 | /* Ensure reference is a tag */ | |
86194b24 | 420 | if (git__prefixcmp(tag_ref->ref.name, GIT_REFS_TAGS_DIR) != 0) |
5bdf7b9f | 421 | return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Reference is not a tag"); |
9282e921 | 422 | |
2f8a8ab2 | 423 | if (buffer + GIT_OID_HEXSZ >= buffer_end) |
5bdf7b9f | 424 | return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Buffer too small"); |
9282e921 | 425 | |
2f8a8ab2 | 426 | /* Is this a valid object id? */ |
fa48608e | 427 | if (git_oid_fromstr(&tag_ref->peel_target, buffer) < GIT_SUCCESS) |
5bdf7b9f | 428 | return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Not a valid object ID"); |
2f8a8ab2 | 429 | |
ff5873ad VM |
430 | buffer = buffer + GIT_OID_HEXSZ; |
431 | if (*buffer == '\r') | |
432 | buffer++; | |
433 | ||
434 | if (*buffer != '\n') | |
5bdf7b9f | 435 | return git__throw(GIT_EPACKEDREFSCORRUPTED, "Failed to parse packed reference. Buffer not terminated correctly"); |
ff5873ad VM |
436 | |
437 | *buffer_out = buffer + 1; | |
86194b24 | 438 | tag_ref->ref.type |= GIT_REF_HAS_PEEL; |
2f8a8ab2 | 439 | |
2f8a8ab2 | 440 | return GIT_SUCCESS; |
9282e921 | 441 | } |
442 | ||
87d3acf4 | 443 | static int packed_parse_oid( |
86194b24 | 444 | reference_oid **ref_out, |
2f8a8ab2 VM |
445 | git_repository *repo, |
446 | const char **buffer_out, | |
447 | const char *buffer_end) | |
9282e921 | 448 | { |
e06dd9b6 | 449 | reference_oid *ref = NULL; |
2f8a8ab2 VM |
450 | |
451 | const char *buffer = *buffer_out; | |
452 | const char *refname_begin, *refname_end; | |
453 | ||
9282e921 | 454 | int error = GIT_SUCCESS; |
9282e921 | 455 | int refname_len; |
3101a3e5 | 456 | char refname[GIT_REFNAME_MAX]; |
1d8cc731 | 457 | git_oid id; |
9282e921 | 458 | |
2f8a8ab2 VM |
459 | refname_begin = (buffer + GIT_OID_HEXSZ + 1); |
460 | if (refname_begin >= buffer_end || | |
461 | refname_begin[-1] != ' ') { | |
462 | error = GIT_EPACKEDREFSCORRUPTED; | |
463 | goto cleanup; | |
464 | } | |
9282e921 | 465 | |
2f8a8ab2 | 466 | /* Is this a valid object id? */ |
fa48608e | 467 | if ((error = git_oid_fromstr(&id, buffer)) < GIT_SUCCESS) |
2f8a8ab2 | 468 | goto cleanup; |
9282e921 | 469 | |
2f8a8ab2 VM |
470 | refname_end = memchr(refname_begin, '\n', buffer_end - refname_begin); |
471 | if (refname_end == NULL) { | |
472 | error = GIT_EPACKEDREFSCORRUPTED; | |
473 | goto cleanup; | |
474 | } | |
9282e921 | 475 | |
2f8a8ab2 | 476 | refname_len = refname_end - refname_begin; |
9282e921 | 477 | |
1d8cc731 | 478 | memcpy(refname, refname_begin, refname_len); |
479 | refname[refname_len] = 0; | |
9282e921 | 480 | |
1d8cc731 | 481 | if (refname[refname_len - 1] == '\r') |
482 | refname[refname_len - 1] = 0; | |
9282e921 | 483 | |
86194b24 | 484 | error = reference_create((git_reference **)&ref, repo, refname, GIT_REF_OID); |
1d8cc731 | 485 | if (error < GIT_SUCCESS) |
486 | goto cleanup; | |
487 | ||
86194b24 VM |
488 | git_oid_cpy(&ref->oid, &id); |
489 | ref->ref.type |= GIT_REF_PACKED; | |
9282e921 | 490 | |
2f8a8ab2 | 491 | *ref_out = ref; |
9282e921 | 492 | *buffer_out = refname_end + 1; |
493 | ||
2f8a8ab2 VM |
494 | return GIT_SUCCESS; |
495 | ||
496 | cleanup: | |
86194b24 | 497 | reference_free((git_reference *)ref); |
5bdf7b9f | 498 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to parse OID of packed reference"); |
9282e921 | 499 | } |
500 | ||
87d3acf4 | 501 | static int packed_load(git_repository *repo) |
9282e921 | 502 | { |
503 | int error = GIT_SUCCESS; | |
f79026b4 | 504 | git_fbuffer packfile = GIT_FBUFFER_INIT; |
2f8a8ab2 | 505 | const char *buffer_start, *buffer_end; |
87d3acf4 VM |
506 | git_refcache *ref_cache = &repo->references; |
507 | ||
508 | /* already loaded */ | |
7341bf87 VM |
509 | if (repo->references.packfile != NULL) { |
510 | time_t packed_time; | |
87d3acf4 | 511 | |
7341bf87 VM |
512 | /* check if we can read the time of the index; |
513 | * if we can read it and it matches the time of the | |
514 | * index we had previously loaded, we don't need to do | |
515 | * anything else. | |
516 | * | |
517 | * if we cannot load the time (e.g. the packfile | |
518 | * has disappeared) or the time is different, we | |
519 | * have to reload the packfile */ | |
87d3acf4 | 520 | |
7341bf87 VM |
521 | if (!reference_read(NULL, &packed_time, repo->path_repository, GIT_PACKEDREFS_FILE) && |
522 | packed_time == ref_cache->packfile_time) | |
523 | return GIT_SUCCESS; | |
87d3acf4 | 524 | |
7341bf87 VM |
525 | git_hashtable_clear(repo->references.packfile); |
526 | } else { | |
527 | ref_cache->packfile = git_hashtable_alloc( | |
932d1baf | 528 | default_table_size, |
7341bf87 VM |
529 | reftable_hash, |
530 | (git_hash_keyeq_ptr)strcmp); | |
531 | ||
532 | if (ref_cache->packfile == NULL) | |
533 | return GIT_ENOMEM; | |
534 | } | |
535 | ||
536 | /* read the packfile from disk; | |
537 | * store its modification time to check for future reloads */ | |
538 | error = reference_read( | |
539 | &packfile, | |
540 | &ref_cache->packfile_time, | |
541 | repo->path_repository, | |
542 | GIT_PACKEDREFS_FILE); | |
87d3acf4 VM |
543 | |
544 | /* there is no packfile on disk; that's ok */ | |
545 | if (error == GIT_ENOTFOUND) | |
546 | return GIT_SUCCESS; | |
2f8a8ab2 | 547 | |
9282e921 | 548 | if (error < GIT_SUCCESS) |
549 | goto cleanup; | |
550 | ||
2f8a8ab2 VM |
551 | buffer_start = (const char *)packfile.data; |
552 | buffer_end = (const char *)(buffer_start) + packfile.len; | |
9282e921 | 553 | |
7c8a7b91 VM |
554 | while (buffer_start < buffer_end && buffer_start[0] == '#') { |
555 | buffer_start = strchr(buffer_start, '\n'); | |
556 | if (buffer_start == NULL) { | |
557 | error = GIT_EPACKEDREFSCORRUPTED; | |
558 | goto cleanup; | |
559 | } | |
ddc9e79a | 560 | buffer_start++; |
7c8a7b91 | 561 | } |
ddc9e79a | 562 | |
9282e921 | 563 | while (buffer_start < buffer_end) { |
86194b24 | 564 | reference_oid *ref = NULL; |
2f8a8ab2 | 565 | |
87d3acf4 | 566 | error = packed_parse_oid(&ref, repo, &buffer_start, buffer_end); |
2f8a8ab2 VM |
567 | if (error < GIT_SUCCESS) |
568 | goto cleanup; | |
569 | ||
9282e921 | 570 | if (buffer_start[0] == '^') { |
87d3acf4 | 571 | error = packed_parse_peel(ref, &buffer_start, buffer_end); |
9282e921 | 572 | if (error < GIT_SUCCESS) |
573 | goto cleanup; | |
2f8a8ab2 | 574 | } |
9282e921 | 575 | |
87d3acf4 | 576 | error = git_hashtable_insert(ref_cache->packfile, ref->ref.name, ref); |
2f8a8ab2 | 577 | if (error < GIT_SUCCESS) { |
86194b24 | 578 | reference_free((git_reference *)ref); |
9282e921 | 579 | goto cleanup; |
2f8a8ab2 VM |
580 | } |
581 | } | |
9282e921 | 582 | |
f79026b4 | 583 | git_futils_freebuffer(&packfile); |
7341bf87 VM |
584 | return GIT_SUCCESS; |
585 | ||
2f8a8ab2 | 586 | cleanup: |
7341bf87 VM |
587 | git_hashtable_free(ref_cache->packfile); |
588 | ref_cache->packfile = NULL; | |
f79026b4 | 589 | git_futils_freebuffer(&packfile); |
5bdf7b9f | 590 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to load packed references"); |
2f8a8ab2 | 591 | } |
9282e921 | 592 | |
00571828 VM |
593 | |
594 | ||
595 | ||
596 | struct dirent_list_data { | |
7ad96e51 | 597 | git_repository *repo; |
00571828 VM |
598 | size_t repo_path_len; |
599 | unsigned int list_flags; | |
09e8de0f VM |
600 | |
601 | int (*callback)(const char *, void *); | |
602 | void *callback_payload; | |
00571828 VM |
603 | }; |
604 | ||
605 | static int _dirent_loose_listall(void *_data, char *full_path) | |
606 | { | |
607 | struct dirent_list_data *data = (struct dirent_list_data *)_data; | |
7ad96e51 | 608 | char *file_path = full_path + data->repo_path_len; |
00571828 | 609 | |
f79026b4 VM |
610 | if (git_futils_isdir(full_path) == GIT_SUCCESS) |
611 | return git_futils_direach(full_path, GIT_PATH_MAX, _dirent_loose_listall, _data); | |
00571828 | 612 | |
7ad96e51 | 613 | /* do not add twice a reference that exists already in the packfile */ |
b5abb881 VM |
614 | if ((data->list_flags & GIT_REF_PACKED) != 0 && |
615 | git_hashtable_lookup(data->repo->references.packfile, file_path) != NULL) | |
7ad96e51 VM |
616 | return GIT_SUCCESS; |
617 | ||
09e8de0f VM |
618 | if (data->list_flags != GIT_REF_LISTALL) { |
619 | if ((data->list_flags & loose_guess_rtype(full_path)) == 0) | |
620 | return GIT_SUCCESS; /* we are filtering out this reference */ | |
621 | } | |
00571828 | 622 | |
09e8de0f | 623 | return data->callback(file_path, data->callback_payload); |
00571828 VM |
624 | } |
625 | ||
87d3acf4 | 626 | static int _dirent_loose_load(void *data, char *full_path) |
2f8a8ab2 | 627 | { |
87d3acf4 VM |
628 | git_repository *repository = (git_repository *)data; |
629 | git_reference *reference, *old_ref; | |
630 | char *file_path; | |
631 | int error; | |
86194b24 | 632 | |
f79026b4 VM |
633 | if (git_futils_isdir(full_path) == GIT_SUCCESS) |
634 | return git_futils_direach(full_path, GIT_PATH_MAX, _dirent_loose_load, repository); | |
9282e921 | 635 | |
87d3acf4 VM |
636 | file_path = full_path + strlen(repository->path_repository); |
637 | error = loose_lookup(&reference, repository, file_path, 1); | |
638 | if (error == GIT_SUCCESS && reference != NULL) { | |
639 | reference->type |= GIT_REF_PACKED; | |
86194b24 | 640 | |
87d3acf4 VM |
641 | if (git_hashtable_insert2(repository->references.packfile, reference->name, reference, (void **)&old_ref) < GIT_SUCCESS) { |
642 | reference_free(reference); | |
643 | return GIT_ENOMEM; | |
644 | } | |
645 | ||
646 | if (old_ref != NULL) | |
647 | reference_free(old_ref); | |
648 | } | |
9282e921 | 649 | |
5bdf7b9f | 650 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to load loose dirent"); |
2f8a8ab2 VM |
651 | } |
652 | ||
87d3acf4 VM |
653 | /* |
654 | * Load all the loose references from the repository | |
655 | * into the in-memory Packfile, and build a vector with | |
656 | * all the references so it can be written back to | |
657 | * disk. | |
658 | */ | |
659 | static int packed_loadloose(git_repository *repository) | |
2f8a8ab2 | 660 | { |
87d3acf4 | 661 | char refs_path[GIT_PATH_MAX]; |
86194b24 | 662 | |
87d3acf4 VM |
663 | /* the packfile must have been previously loaded! */ |
664 | assert(repository->references.packfile); | |
9282e921 | 665 | |
f79026b4 | 666 | git_path_join(refs_path, repository->path_repository, GIT_REFS_DIR); |
86194b24 | 667 | |
87d3acf4 VM |
668 | /* Remove any loose references from the cache */ |
669 | { | |
402a47a7 | 670 | const void *GIT_UNUSED(_unused); |
87d3acf4 | 671 | git_reference *reference; |
9282e921 | 672 | |
87d3acf4 VM |
673 | GIT_HASHTABLE_FOREACH(repository->references.loose_cache, _unused, reference, |
674 | reference_free(reference); | |
675 | ); | |
676 | } | |
677 | ||
678 | git_hashtable_clear(repository->references.loose_cache); | |
679 | ||
680 | /* | |
681 | * Load all the loose files from disk into the Packfile table. | |
682 | * This will overwrite any old packed entries with their | |
932d1baf | 683 | * updated loose versions |
87d3acf4 | 684 | */ |
f79026b4 | 685 | return git_futils_direach(refs_path, GIT_PATH_MAX, _dirent_loose_load, repository); |
2f8a8ab2 | 686 | } |
9282e921 | 687 | |
87d3acf4 VM |
688 | /* |
689 | * Write a single reference into a packfile | |
690 | */ | |
691 | static int packed_write_ref(reference_oid *ref, git_filebuf *file) | |
2f8a8ab2 | 692 | { |
87d3acf4 VM |
693 | int error; |
694 | char oid[GIT_OID_HEXSZ + 1]; | |
2f8a8ab2 | 695 | |
87d3acf4 VM |
696 | git_oid_fmt(oid, &ref->oid); |
697 | oid[GIT_OID_HEXSZ] = 0; | |
2f8a8ab2 | 698 | |
932d1baf | 699 | /* |
87d3acf4 VM |
700 | * For references that peel to an object in the repo, we must |
701 | * write the resulting peel on a separate line, e.g. | |
702 | * | |
703 | * 6fa8a902cc1d18527e1355773c86721945475d37 refs/tags/libgit2-0.4 | |
704 | * ^2ec0cb7959b0bf965d54f95453f5b4b34e8d3100 | |
705 | * | |
706 | * This obviously only applies to tags. | |
707 | * The required peels have already been loaded into `ref->peel_target`. | |
708 | */ | |
709 | if (ref->ref.type & GIT_REF_HAS_PEEL) { | |
710 | char peel[GIT_OID_HEXSZ + 1]; | |
711 | git_oid_fmt(peel, &ref->peel_target); | |
712 | peel[GIT_OID_HEXSZ] = 0; | |
713 | ||
714 | error = git_filebuf_printf(file, "%s %s\n^%s\n", oid, ref->ref.name, peel); | |
715 | } else { | |
716 | error = git_filebuf_printf(file, "%s %s\n", oid, ref->ref.name); | |
717 | } | |
718 | ||
5bdf7b9f | 719 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write packed reference"); |
9282e921 | 720 | } |
721 | ||
87d3acf4 VM |
722 | /* |
723 | * Find out what object this reference resolves to. | |
724 | * | |
932d1baf | 725 | * For references that point to a 'big' tag (e.g. an |
87d3acf4 VM |
726 | * actual tag object on the repository), we need to |
727 | * cache on the packfile the OID of the object to | |
728 | * which that 'big tag' is pointing to. | |
729 | */ | |
730 | static int packed_find_peel(reference_oid *ref) | |
9282e921 | 731 | { |
d79f1da6 | 732 | git_object *object; |
87d3acf4 | 733 | int error; |
32054c24 | 734 | |
87d3acf4 VM |
735 | if (ref->ref.type & GIT_REF_HAS_PEEL) |
736 | return GIT_SUCCESS; | |
9282e921 | 737 | |
87d3acf4 VM |
738 | /* |
739 | * Only applies to tags, i.e. references | |
740 | * in the /refs/tags folder | |
741 | */ | |
742 | if (git__prefixcmp(ref->ref.name, GIT_REFS_TAGS_DIR) != 0) | |
743 | return GIT_SUCCESS; | |
9282e921 | 744 | |
87d3acf4 | 745 | /* |
d79f1da6 | 746 | * Find the tagged object in the repository |
87d3acf4 | 747 | */ |
d79f1da6 | 748 | error = git_object_lookup(&object, ref->ref.owner, &ref->oid, GIT_OBJ_ANY); |
87d3acf4 | 749 | if (error < GIT_SUCCESS) |
5bdf7b9f | 750 | return git__throw(GIT_EOBJCORRUPTED, "Failed to find packed reference"); |
86194b24 | 751 | |
87d3acf4 | 752 | /* |
d79f1da6 VM |
753 | * If the tagged object is a Tag object, we need to resolve it; |
754 | * if the ref is actually a 'weak' ref, we don't need to resolve | |
755 | * anything. | |
87d3acf4 | 756 | */ |
d79f1da6 VM |
757 | if (git_object_type(object) == GIT_OBJ_TAG) { |
758 | git_tag *tag = (git_tag *)object; | |
86194b24 | 759 | |
d79f1da6 VM |
760 | /* |
761 | * Find the object pointed at by this tag | |
762 | */ | |
763 | git_oid_cpy(&ref->peel_target, git_tag_target_oid(tag)); | |
764 | ref->ref.type |= GIT_REF_HAS_PEEL; | |
765 | ||
766 | /* | |
767 | * The reference has now cached the resolved OID, and is | |
768 | * marked at such. When written to the packfile, it'll be | |
769 | * accompanied by this resolved oid | |
770 | */ | |
771 | } | |
87d3acf4 | 772 | |
1648fbd3 VM |
773 | git_object_close(object); |
774 | ||
87d3acf4 | 775 | return GIT_SUCCESS; |
2f8a8ab2 | 776 | } |
9282e921 | 777 | |
87d3acf4 VM |
778 | /* |
779 | * Remove all loose references | |
780 | * | |
781 | * Once we have successfully written a packfile, | |
782 | * all the loose references that were packed must be | |
783 | * removed from disk. | |
784 | * | |
785 | * This is a dangerous method; make sure the packfile | |
786 | * is well-written, because we are destructing references | |
787 | * here otherwise. | |
788 | */ | |
789 | static int packed_remove_loose(git_repository *repo, git_vector *packing_list) | |
2f8a8ab2 | 790 | { |
87d3acf4 VM |
791 | unsigned int i; |
792 | char full_path[GIT_PATH_MAX]; | |
793 | int error = GIT_SUCCESS; | |
8f90ced5 | 794 | git_reference *reference; |
87d3acf4 VM |
795 | |
796 | for (i = 0; i < packing_list->length; ++i) { | |
797 | git_reference *ref = git_vector_get(packing_list, i); | |
8f90ced5 | 798 | |
799 | /* Ensure the packed reference doesn't exist | |
800 | * in a (more up-to-date?) state as a loose reference | |
801 | */ | |
802 | reference = git_hashtable_lookup(ref->owner->references.loose_cache, ref->name); | |
803 | if (reference != NULL) | |
804 | continue; | |
805 | ||
f79026b4 | 806 | git_path_join(full_path, repo->path_repository, ref->name); |
87d3acf4 | 807 | |
f79026b4 VM |
808 | if (git_futils_exists(full_path) == GIT_SUCCESS && |
809 | p_unlink(full_path) < GIT_SUCCESS) | |
87d3acf4 VM |
810 | error = GIT_EOSERR; |
811 | ||
812 | /* | |
813 | * if we fail to remove a single file, this is *not* good, | |
814 | * but we should keep going and remove as many as possible. | |
815 | * After we've removed as many files as possible, we return | |
816 | * the error code anyway. | |
817 | * | |
818 | * TODO: mark this with a very special error code? | |
819 | * GIT_EFAILTORMLOOSE | |
820 | */ | |
821 | } | |
822 | ||
5bdf7b9f | 823 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to remove loose packed reference"); |
2f8a8ab2 | 824 | } |
9282e921 | 825 | |
87d3acf4 | 826 | static int packed_sort(const void *a, const void *b) |
2f8a8ab2 | 827 | { |
de18f276 VM |
828 | const git_reference *ref_a = (const git_reference *)a; |
829 | const git_reference *ref_b = (const git_reference *)b; | |
87d3acf4 VM |
830 | |
831 | return strcmp(ref_a->name, ref_b->name); | |
2f8a8ab2 VM |
832 | } |
833 | ||
87d3acf4 VM |
834 | /* |
835 | * Write all the contents in the in-memory packfile to disk. | |
836 | */ | |
837 | static int packed_write(git_repository *repo) | |
2f8a8ab2 | 838 | { |
87d3acf4 VM |
839 | git_filebuf pack_file; |
840 | int error; | |
841 | unsigned int i; | |
842 | char pack_file_path[GIT_PATH_MAX]; | |
2f8a8ab2 | 843 | |
87d3acf4 VM |
844 | git_vector packing_list; |
845 | size_t total_refs; | |
2f8a8ab2 | 846 | |
87d3acf4 | 847 | assert(repo && repo->references.packfile); |
9282e921 | 848 | |
87d3acf4 | 849 | total_refs = repo->references.packfile->key_count; |
86d7e1ca | 850 | if ((error = git_vector_init(&packing_list, total_refs, packed_sort)) < GIT_SUCCESS) |
5bdf7b9f | 851 | return git__rethrow(error, "Failed to write packed reference"); |
9282e921 | 852 | |
87d3acf4 VM |
853 | /* Load all the packfile into a vector */ |
854 | { | |
855 | git_reference *reference; | |
402a47a7 | 856 | const void *GIT_UNUSED(_unused); |
87d3acf4 VM |
857 | |
858 | GIT_HASHTABLE_FOREACH(repo->references.packfile, _unused, reference, | |
859 | git_vector_insert(&packing_list, reference); /* cannot fail: vector already has the right size */ | |
860 | ); | |
9282e921 | 861 | } |
862 | ||
87d3acf4 VM |
863 | /* sort the vector so the entries appear sorted on the packfile */ |
864 | git_vector_sort(&packing_list); | |
9282e921 | 865 | |
87d3acf4 | 866 | /* Now we can open the file! */ |
f79026b4 | 867 | git_path_join(pack_file_path, repo->path_repository, GIT_PACKEDREFS_FILE); |
87d3acf4 | 868 | if ((error = git_filebuf_open(&pack_file, pack_file_path, 0)) < GIT_SUCCESS) |
5bdf7b9f | 869 | return git__rethrow(error, "Failed to write packed reference"); |
9282e921 | 870 | |
7c8a7b91 VM |
871 | /* Packfiles have a header... apparently |
872 | * This is in fact not required, but we might as well print it | |
873 | * just for kicks */ | |
87d3acf4 | 874 | if ((error = git_filebuf_printf(&pack_file, "%s\n", GIT_PACKEDREFS_HEADER)) < GIT_SUCCESS) |
5bdf7b9f | 875 | return git__rethrow(error, "Failed to write packed reference"); |
2f8a8ab2 | 876 | |
87d3acf4 VM |
877 | for (i = 0; i < packing_list.length; ++i) { |
878 | reference_oid *ref = (reference_oid *)git_vector_get(&packing_list, i); | |
2f8a8ab2 | 879 | |
87d3acf4 VM |
880 | /* only direct references go to the packfile; otherwise |
881 | * this is a disaster */ | |
882 | assert(ref->ref.type & GIT_REF_OID); | |
2f8a8ab2 | 883 | |
2b397327 VM |
884 | if ((error = packed_find_peel(ref)) < GIT_SUCCESS) { |
885 | error = git__throw(GIT_EOBJCORRUPTED, "A reference cannot be peeled"); | |
87d3acf4 | 886 | goto cleanup; |
2b397327 VM |
887 | } |
888 | ||
2f8a8ab2 | 889 | |
87d3acf4 VM |
890 | if ((error = packed_write_ref(ref, &pack_file)) < GIT_SUCCESS) |
891 | goto cleanup; | |
892 | } | |
2f8a8ab2 | 893 | |
87d3acf4 VM |
894 | cleanup: |
895 | /* if we've written all the references properly, we can commit | |
896 | * the packfile to make the changes effective */ | |
897 | if (error == GIT_SUCCESS) { | |
898 | error = git_filebuf_commit(&pack_file); | |
899 | ||
900 | /* when and only when the packfile has been properly written, | |
901 | * we can go ahead and remove the loose refs */ | |
7341bf87 VM |
902 | if (error == GIT_SUCCESS) { |
903 | struct stat st; | |
904 | ||
87d3acf4 | 905 | error = packed_remove_loose(repo, &packing_list); |
7341bf87 | 906 | |
f79026b4 | 907 | if (p_stat(pack_file_path, &st) == GIT_SUCCESS) |
7341bf87 VM |
908 | repo->references.packfile_time = st.st_mtime; |
909 | } | |
9282e921 | 910 | } |
87d3acf4 | 911 | else git_filebuf_cleanup(&pack_file); |
9282e921 | 912 | |
87d3acf4 | 913 | git_vector_free(&packing_list); |
1d8cc731 | 914 | |
5bdf7b9f | 915 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to write packed reference"); |
87d3acf4 | 916 | } |
2f8a8ab2 | 917 | |
1b6d8163 MS |
918 | static int _reference_available_cb(const char *ref, void *data) |
919 | { | |
f120e92b | 920 | const char *new, *old; |
921 | git_vector *refs; | |
922 | ||
1b6d8163 MS |
923 | assert(ref && data); |
924 | ||
f120e92b | 925 | refs = (git_vector *)data; |
1b6d8163 | 926 | |
f120e92b | 927 | new = (const char *)git_vector_get(refs, 0); |
928 | old = (const char *)git_vector_get(refs, 1); | |
1b6d8163 MS |
929 | |
930 | if (!old || strcmp(old, ref)) { | |
931 | int reflen = strlen(ref); | |
932 | int newlen = strlen(new); | |
933 | int cmplen = reflen < newlen ? reflen : newlen; | |
934 | const char *lead = reflen < newlen ? new : ref; | |
935 | ||
936 | if (!strncmp(new, ref, cmplen) && | |
937 | lead[cmplen] == '/') | |
938 | return GIT_EEXISTS; | |
939 | } | |
940 | ||
941 | return GIT_SUCCESS; | |
942 | } | |
943 | ||
944 | static int reference_available(git_repository *repo, const char *ref, const char* old_ref) | |
945 | { | |
946 | int error; | |
947 | git_vector refs; | |
948 | ||
949 | if (git_vector_init(&refs, 2, NULL) < GIT_SUCCESS) | |
950 | return GIT_ENOMEM; | |
951 | ||
952 | git_vector_insert(&refs, (void *)ref); | |
953 | git_vector_insert(&refs, (void *)old_ref); | |
954 | ||
43521d06 | 955 | error = git_reference_foreach(repo, GIT_REF_LISTALL, _reference_available_cb, (void *)&refs); |
1b6d8163 MS |
956 | |
957 | git_vector_free(&refs); | |
958 | ||
76b15cb1 | 959 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__throw(GIT_EEXISTS, "Reference name `%s` conflicts with existing reference", ref); |
1b6d8163 MS |
960 | } |
961 | ||
87d3acf4 VM |
962 | /***************************************** |
963 | * External Library API | |
964 | *****************************************/ | |
965 | ||
966 | /** | |
967 | * Constructors | |
968 | */ | |
5de079b8 | 969 | int git_reference_lookup(git_reference **ref_out, git_repository *repo, const char *name) |
2f8a8ab2 VM |
970 | { |
971 | int error; | |
3101a3e5 | 972 | char normalized_name[GIT_REFNAME_MAX]; |
2f8a8ab2 VM |
973 | |
974 | assert(ref_out && repo && name); | |
975 | ||
976 | *ref_out = NULL; | |
977 | ||
3101a3e5 | 978 | error = normalize_name(normalized_name, sizeof(normalized_name), name, 0); |
2f8a8ab2 | 979 | if (error < GIT_SUCCESS) |
5bdf7b9f | 980 | return git__rethrow(error, "Failed to lookup reference"); |
2f8a8ab2 | 981 | |
87d3acf4 VM |
982 | /* First, check has been previously loaded and cached */ |
983 | *ref_out = git_hashtable_lookup(repo->references.loose_cache, normalized_name); | |
2f8a8ab2 | 984 | if (*ref_out != NULL) |
7341bf87 | 985 | return loose_update(*ref_out); |
2f8a8ab2 | 986 | |
87d3acf4 VM |
987 | /* Then check if there is a loose file for that reference.*/ |
988 | error = loose_lookup(ref_out, repo, normalized_name, 0); | |
2f8a8ab2 | 989 | |
87d3acf4 | 990 | /* If the file exists, we store it on the cache */ |
2f8a8ab2 | 991 | if (error == GIT_SUCCESS) |
87d3acf4 | 992 | return git_hashtable_insert(repo->references.loose_cache, (*ref_out)->name, (*ref_out)); |
2f8a8ab2 | 993 | |
87d3acf4 VM |
994 | /* The loose lookup has failed, but not because the reference wasn't found; |
995 | * probably the loose reference is corrupted. this is bad. */ | |
9282e921 | 996 | if (error != GIT_ENOTFOUND) |
5bdf7b9f | 997 | return git__rethrow(error, "Failed to lookup reference"); |
9282e921 | 998 | |
87d3acf4 VM |
999 | /* |
1000 | * If we cannot find a loose reference, we look into the packfile | |
932d1baf | 1001 | * Load the packfile first if it hasn't been loaded |
87d3acf4 | 1002 | */ |
7341bf87 VM |
1003 | /* load all the packed references */ |
1004 | error = packed_load(repo); | |
1005 | if (error < GIT_SUCCESS) | |
5bdf7b9f | 1006 | return git__rethrow(error, "Failed to lookup reference"); |
9282e921 | 1007 | |
87d3acf4 VM |
1008 | /* Look up on the packfile */ |
1009 | *ref_out = git_hashtable_lookup(repo->references.packfile, normalized_name); | |
86194b24 VM |
1010 | if (*ref_out != NULL) |
1011 | return GIT_SUCCESS; | |
1012 | ||
2f8a8ab2 | 1013 | /* The reference doesn't exist anywhere */ |
5bdf7b9f | 1014 | return git__throw(GIT_ENOTFOUND, "Failed to lookup reference. Reference doesn't exist"); |
2f8a8ab2 | 1015 | } |
9282e921 | 1016 | |
87d3acf4 VM |
1017 | /** |
1018 | * Getters | |
1019 | */ | |
1020 | git_rtype git_reference_type(git_reference *ref) | |
1021 | { | |
1022 | assert(ref); | |
1023 | ||
1024 | if (ref->type & GIT_REF_OID) | |
1025 | return GIT_REF_OID; | |
1026 | ||
1027 | if (ref->type & GIT_REF_SYMBOLIC) | |
1028 | return GIT_REF_SYMBOLIC; | |
1029 | ||
1030 | return GIT_REF_INVALID; | |
1031 | } | |
1032 | ||
1033 | const char *git_reference_name(git_reference *ref) | |
1034 | { | |
1035 | assert(ref); | |
1036 | return ref->name; | |
1037 | } | |
1038 | ||
1039 | git_repository *git_reference_owner(git_reference *ref) | |
1040 | { | |
1041 | assert(ref); | |
1042 | return ref->owner; | |
1043 | } | |
1044 | ||
1045 | const git_oid *git_reference_oid(git_reference *ref) | |
1046 | { | |
1047 | assert(ref); | |
1048 | ||
1049 | if ((ref->type & GIT_REF_OID) == 0) | |
1050 | return NULL; | |
1051 | ||
7341bf87 VM |
1052 | if (loose_update(ref) < GIT_SUCCESS) |
1053 | return NULL; | |
1054 | ||
87d3acf4 VM |
1055 | return &((reference_oid *)ref)->oid; |
1056 | } | |
1057 | ||
1058 | const char *git_reference_target(git_reference *ref) | |
1059 | { | |
1060 | assert(ref); | |
1061 | ||
1062 | if ((ref->type & GIT_REF_SYMBOLIC) == 0) | |
1063 | return NULL; | |
1064 | ||
7341bf87 VM |
1065 | if (loose_update(ref) < GIT_SUCCESS) |
1066 | return NULL; | |
1067 | ||
87d3acf4 VM |
1068 | return ((reference_symbolic *)ref)->target; |
1069 | } | |
1070 | ||
d5afc039 VM |
1071 | int git_reference_create_symbolic(git_reference **ref_out, git_repository *repo, const char *name, const char *target, int force) |
1072 | { | |
1073 | char normalized[GIT_REFNAME_MAX]; | |
1074 | int error = GIT_SUCCESS, updated = 0; | |
1075 | git_reference *ref = NULL, *old_ref = NULL; | |
1076 | ||
1077 | if (git_reference_lookup(&ref, repo, name) == GIT_SUCCESS && !force) | |
1078 | return git__throw(GIT_EEXISTS, "Failed to create symbolic reference. Reference already exists"); | |
1079 | ||
1080 | /* | |
1081 | * If they old ref was of the same type, then we can just update | |
1082 | * it (once we've checked that the target is valid). Otherwise we | |
1083 | * need a new reference because we can't make a symbolic ref out | |
1084 | * of an oid one. | |
1085 | * If if didn't exist, then we need to create a new one anyway. | |
1086 | */ | |
1087 | if (ref && ref->type & GIT_REF_SYMBOLIC){ | |
1088 | updated = 1; | |
1089 | } else { | |
1090 | ref = NULL; | |
1091 | error = reference_create(&ref, repo, name, GIT_REF_SYMBOLIC); | |
1092 | if (error < GIT_SUCCESS) | |
1093 | goto cleanup; | |
1094 | } | |
1095 | ||
1096 | /* The target can aither be the name of an object id reference or the name of another symbolic reference */ | |
1097 | error = normalize_name(normalized, sizeof(normalized), target, 0); | |
1098 | if (error < GIT_SUCCESS) | |
1099 | goto cleanup; | |
1100 | ||
1101 | /* set the target; this will write the reference on disk */ | |
1102 | error = git_reference_set_target(ref, normalized); | |
1103 | if (error < GIT_SUCCESS) | |
1104 | goto cleanup; | |
1105 | ||
1106 | /* | |
1107 | * If we didn't update the ref, then we need to insert or replace | |
1108 | * it in the loose cache. If we replaced a ref, free it. | |
1109 | */ | |
1110 | if (!updated){ | |
1111 | error = git_hashtable_insert2(repo->references.loose_cache, ref->name, ref, (void **) &old_ref); | |
1112 | if (error < GIT_SUCCESS) | |
1113 | goto cleanup; | |
1114 | ||
1115 | if(old_ref) | |
1116 | reference_free(old_ref); | |
1117 | } | |
1118 | ||
1119 | *ref_out = ref; | |
1120 | ||
1121 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create symbolic reference"); | |
1122 | ||
1123 | cleanup: | |
1124 | reference_free(ref); | |
1125 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create symbolic reference"); | |
1126 | } | |
1127 | ||
1128 | int git_reference_create_oid(git_reference **ref_out, git_repository *repo, const char *name, const git_oid *id, int force) | |
1129 | { | |
1130 | int error = GIT_SUCCESS, updated = 0; | |
1131 | git_reference *ref = NULL, *old_ref = NULL; | |
1132 | ||
1133 | if(git_reference_lookup(&ref, repo, name) == GIT_SUCCESS && !force) | |
1134 | return git__throw(GIT_EEXISTS, "Failed to create reference OID. Reference already exists"); | |
1135 | ||
1136 | if ((error = reference_available(repo, name, NULL)) < GIT_SUCCESS) | |
1137 | return git__rethrow(error, "Failed to create reference"); | |
1138 | ||
1139 | /* | |
1140 | * If they old ref was of the same type, then we can just update | |
1141 | * it (once we've checked that the target is valid). Otherwise we | |
1142 | * need a new reference because we can't make a symbolic ref out | |
1143 | * of an oid one. | |
1144 | * If if didn't exist, then we need to create a new one anyway. | |
1145 | */ | |
1146 | if (ref && ref-> type & GIT_REF_OID){ | |
1147 | updated = 1; | |
1148 | } else { | |
1149 | ref = NULL; | |
1150 | error = reference_create(&ref, repo, name, GIT_REF_OID); | |
1151 | if (error < GIT_SUCCESS) | |
1152 | goto cleanup; | |
1153 | } | |
1154 | ||
1155 | /* set the oid; this will write the reference on disk */ | |
1156 | error = git_reference_set_oid(ref, id); | |
1157 | if (error < GIT_SUCCESS) | |
1158 | goto cleanup; | |
1159 | ||
1160 | if(!updated){ | |
1161 | error = git_hashtable_insert2(repo->references.loose_cache, ref->name, ref, (void **) &old_ref); | |
1162 | if (error < GIT_SUCCESS) | |
1163 | goto cleanup; | |
1164 | ||
1165 | if(old_ref) | |
1166 | reference_free(old_ref); | |
1167 | } | |
1168 | ||
1169 | *ref_out = ref; | |
1170 | ||
1171 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create reference OID"); | |
1172 | ||
1173 | cleanup: | |
1174 | reference_free(ref); | |
1175 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to create reference OID"); | |
1176 | } | |
1177 | ||
87d3acf4 VM |
1178 | /** |
1179 | * Setters | |
1180 | */ | |
1181 | ||
1182 | /* | |
1183 | * Change the OID target of a reference. | |
1184 | * | |
1185 | * For loose references, just change the oid in memory | |
1186 | * and overwrite the file in disk. | |
1187 | * | |
1188 | * For packed files, this is not pretty: | |
1189 | * For performance reasons, we write the new reference | |
1190 | * loose on disk (it replaces the old on the packfile), | |
1191 | * but we cannot invalidate the pointer to the reference, | |
1192 | * and most importantly, the `packfile` object must stay | |
1193 | * consistent with the representation of the packfile | |
1194 | * on disk. This is what we need to: | |
1195 | * | |
1196 | * 1. Copy the reference | |
1197 | * 2. Change the oid on the original | |
1198 | * 3. Write the original to disk | |
1199 | * 4. Write the original to the loose cache | |
1200 | * 5. Replace the original with the copy (old reference) in the packfile cache | |
1201 | */ | |
1202 | int git_reference_set_oid(git_reference *ref, const git_oid *id) | |
1203 | { | |
1204 | reference_oid *ref_oid; | |
1205 | reference_oid *ref_old = NULL; | |
1206 | int error = GIT_SUCCESS; | |
1207 | ||
1208 | if ((ref->type & GIT_REF_OID) == 0) | |
5bdf7b9f | 1209 | return git__throw(GIT_EINVALIDREFSTATE, "Failed to set OID target of reference. Not an OID reference"); |
87d3acf4 VM |
1210 | |
1211 | ref_oid = (reference_oid *)ref; | |
1212 | ||
9a53df7e VM |
1213 | assert(ref->owner); |
1214 | ||
1215 | /* Don't let the user create references to OIDs that | |
1216 | * don't exist in the ODB */ | |
1217 | if (!git_odb_exists(git_repository_database(ref->owner), id)) | |
5bdf7b9f | 1218 | return git__throw(GIT_ENOTFOUND, "Failed to set OID target of reference. OID doesn't exist in ODB"); |
9a53df7e | 1219 | |
87d3acf4 VM |
1220 | /* duplicate the reference; |
1221 | * this copy will stay on the packfile cache */ | |
1222 | if (ref->type & GIT_REF_PACKED) { | |
1223 | ref_old = git__malloc(sizeof(reference_oid)); | |
1224 | if (ref_old == NULL) | |
1225 | return GIT_ENOMEM; | |
1226 | ||
1227 | ref_old->ref.name = git__strdup(ref->name); | |
1228 | if (ref_old->ref.name == NULL) { | |
1229 | free(ref_old); | |
1230 | return GIT_ENOMEM; | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | git_oid_cpy(&ref_oid->oid, id); | |
1235 | ref->type &= ~GIT_REF_HAS_PEEL; | |
1236 | ||
932d1baf | 1237 | error = loose_write(ref); |
87d3acf4 VM |
1238 | if (error < GIT_SUCCESS) |
1239 | goto cleanup; | |
1240 | ||
1241 | if (ref->type & GIT_REF_PACKED) { | |
1242 | /* insert the original on the loose cache */ | |
1243 | error = git_hashtable_insert(ref->owner->references.loose_cache, ref->name, ref); | |
1244 | if (error < GIT_SUCCESS) | |
1245 | goto cleanup; | |
1246 | ||
1247 | ref->type &= ~GIT_REF_PACKED; | |
1248 | ||
1249 | /* replace the original in the packfile with the copy */ | |
1250 | error = git_hashtable_insert(ref->owner->references.packfile, ref_old->ref.name, ref_old); | |
1251 | if (error < GIT_SUCCESS) | |
1252 | goto cleanup; | |
1253 | } | |
1254 | ||
1255 | return GIT_SUCCESS; | |
1256 | ||
1257 | cleanup: | |
1258 | reference_free((git_reference *)ref_old); | |
5bdf7b9f | 1259 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to set OID target of reference"); |
87d3acf4 VM |
1260 | } |
1261 | ||
1262 | /* | |
1263 | * Change the target of a symbolic reference. | |
1264 | * | |
1265 | * This is easy because symrefs cannot be inside | |
1266 | * a pack. We just change the target in memory | |
1267 | * and overwrite the file on disk. | |
1268 | */ | |
1269 | int git_reference_set_target(git_reference *ref, const char *target) | |
1270 | { | |
1271 | reference_symbolic *ref_sym; | |
1272 | ||
1273 | if ((ref->type & GIT_REF_SYMBOLIC) == 0) | |
5bdf7b9f | 1274 | return git__throw(GIT_EINVALIDREFSTATE, "Failed to set reference target. Not a symbolic reference"); |
87d3acf4 VM |
1275 | |
1276 | ref_sym = (reference_symbolic *)ref; | |
1277 | ||
1278 | free(ref_sym->target); | |
1279 | ref_sym->target = git__strdup(target); | |
1280 | if (ref_sym->target == NULL) | |
1281 | return GIT_ENOMEM; | |
1282 | ||
1283 | return loose_write(ref); | |
1284 | } | |
1285 | ||
1286 | /** | |
1287 | * Other | |
1288 | */ | |
1289 | ||
7376ad99 VM |
1290 | int git_reference_rename(git_reference *ref, const char *new_name, int force) |
1291 | { | |
1292 | int error; | |
ca6f203c | 1293 | char *old_name = NULL; |
858dba58 VM |
1294 | |
1295 | char aux_path[GIT_PATH_MAX]; | |
0ffcf78a | 1296 | char normalized[GIT_REFNAME_MAX]; |
858dba58 | 1297 | |
0ffcf78a MS |
1298 | const char *target_ref = NULL; |
1299 | const char *head_target = NULL; | |
1300 | const git_oid *target_oid = NULL; | |
1301 | git_reference *new_ref = NULL, *old_ref = NULL, *head = NULL; | |
7376ad99 VM |
1302 | |
1303 | assert(ref); | |
1304 | ||
0ffcf78a | 1305 | error = normalize_name(normalized, sizeof(normalized), new_name, ref->type & GIT_REF_OID); |
7376ad99 | 1306 | if (error < GIT_SUCCESS) |
0ffcf78a | 1307 | return git__rethrow(error, "Failed to rename reference. Invalid name"); |
7376ad99 | 1308 | |
0ffcf78a | 1309 | new_name = normalized; |
7376ad99 | 1310 | |
0ffcf78a | 1311 | error = git_reference_lookup(&new_ref, ref->owner, new_name); |
73294339 MS |
1312 | if (error == GIT_SUCCESS) { |
1313 | if (!force) | |
1314 | return git__throw(GIT_EEXISTS, "Failed to rename reference. Reference already exists"); | |
1315 | ||
1316 | error = git_reference_delete(new_ref); | |
1317 | } | |
7376ad99 | 1318 | |
0ffcf78a MS |
1319 | if (error < GIT_SUCCESS && error != GIT_ENOTFOUND) |
1320 | goto cleanup; | |
7376ad99 VM |
1321 | |
1322 | if ((error = reference_available(ref->owner, new_name, ref->name)) < GIT_SUCCESS) | |
0ffcf78a | 1323 | return git__rethrow(error, "Failed to rename reference. Reference already exists"); |
7376ad99 | 1324 | |
0ffcf78a MS |
1325 | /* |
1326 | * First, we backup the reference targets. Just keeping the old | |
1327 | * reference won't work, since we may have to remove it to create | |
1328 | * the new reference, e.g. when renaming foo/bar -> foo. | |
1329 | */ | |
7376ad99 | 1330 | |
ca6f203c MS |
1331 | old_name = git__strdup(ref->name); |
1332 | ||
0ffcf78a MS |
1333 | if (ref->type & GIT_REF_SYMBOLIC) { |
1334 | if ((target_ref = git_reference_target(ref)) == NULL) | |
1335 | goto cleanup; | |
1336 | } else { | |
1337 | if ((target_oid = git_reference_oid(ref)) == NULL) | |
1338 | goto cleanup; | |
7376ad99 VM |
1339 | } |
1340 | ||
0ffcf78a MS |
1341 | /* |
1342 | * Now delete the old ref and remove an possibly existing directory | |
1343 | * named `new_name`. | |
1344 | */ | |
7376ad99 | 1345 | |
0ffcf78a | 1346 | if (ref->type & GIT_REF_PACKED) { |
637edc9c VM |
1347 | ref->type &= ~GIT_REF_PACKED; |
1348 | ||
7376ad99 | 1349 | git_hashtable_remove(ref->owner->references.packfile, old_name); |
0ffcf78a MS |
1350 | if ((error = packed_write(ref->owner)) < GIT_SUCCESS) |
1351 | goto rollback; | |
7376ad99 | 1352 | } else { |
858dba58 VM |
1353 | git_path_join(aux_path, ref->owner->path_repository, old_name); |
1354 | if ((error = p_unlink(aux_path)) < GIT_SUCCESS) | |
7376ad99 VM |
1355 | goto cleanup; |
1356 | ||
7376ad99 VM |
1357 | git_hashtable_remove(ref->owner->references.loose_cache, old_name); |
1358 | } | |
1359 | ||
858dba58 VM |
1360 | /* build new path */ |
1361 | git_path_join(aux_path, ref->owner->path_repository, new_name); | |
7376ad99 | 1362 | |
858dba58 VM |
1363 | if (git_futils_exists(aux_path) == GIT_SUCCESS) { |
1364 | if (git_futils_isdir(aux_path) == GIT_SUCCESS) { | |
1365 | if ((error = git_futils_rmdir_r(aux_path, 0)) < GIT_SUCCESS) | |
0ffcf78a MS |
1366 | goto rollback; |
1367 | } else goto rollback; | |
1368 | } | |
7376ad99 | 1369 | |
0ffcf78a MS |
1370 | /* |
1371 | * Crude hack: delete any logs till we support proper reflogs. | |
1372 | * Otherwise git.git will possibly fail and leave a mess. git.git | |
1373 | * writes reflogs by default in any repo with a working directory: | |
1374 | * | |
1375 | * "We only enable reflogs in repositories that have a working directory | |
1376 | * associated with them, as shared/bare repositories do not have | |
1377 | * an easy means to prune away old log entries, or may fail logging | |
1378 | * entirely if the user's gecos information is not valid during a push. | |
1379 | * This heuristic was suggested on the mailing list by Junio." | |
1380 | * | |
1381 | * Shawn O. Pearce - 0bee59186976b1d9e6b2dd77332480c9480131d5 | |
1382 | * | |
1383 | * TODO | |
1384 | * | |
1385 | */ | |
1386 | ||
858dba58 VM |
1387 | git_path_join_n(aux_path, 3, ref->owner->path_repository, "logs", old_name); |
1388 | if (git_futils_isfile(aux_path) == GIT_SUCCESS) { | |
1389 | if ((error = p_unlink(aux_path)) < GIT_SUCCESS) | |
1390 | goto rollback; | |
0ffcf78a MS |
1391 | } |
1392 | ||
1393 | /* | |
1394 | * Finally we can create the new reference. | |
1395 | */ | |
0ffcf78a MS |
1396 | if (ref->type & GIT_REF_SYMBOLIC) { |
1397 | if ((error = git_reference_create_symbolic(&new_ref, ref->owner, new_name, target_ref, 0)) < GIT_SUCCESS) | |
1398 | goto rollback; | |
1399 | } else { | |
1400 | if ((error = git_reference_create_oid(&new_ref, ref->owner, new_name, target_oid, 0)) < GIT_SUCCESS) | |
1401 | goto rollback; | |
1402 | } | |
7376ad99 | 1403 | |
7376ad99 | 1404 | free(ref->name); |
0ffcf78a MS |
1405 | ref->name = new_ref->name; |
1406 | ||
5c6ae009 KS |
1407 | /* |
1408 | * No need in new_ref anymore. We created it to fix the change on disk. | |
1409 | * TODO: Refactoring required. | |
1410 | */ | |
1411 | new_ref->name = NULL; | |
1412 | reference_free(new_ref); | |
1413 | ||
1414 | if ((error = git_hashtable_insert2(ref->owner->references.loose_cache, ref->name, ref, (void **)&old_ref)) < GIT_SUCCESS) | |
0ffcf78a | 1415 | goto rollback; |
7376ad99 | 1416 | |
0ffcf78a MS |
1417 | /* |
1418 | * Check if we have to update HEAD. | |
1419 | */ | |
7376ad99 | 1420 | |
0ffcf78a MS |
1421 | if ((error = git_reference_lookup(&head, ref->owner, GIT_HEAD_FILE)) < GIT_SUCCESS) |
1422 | goto cleanup; | |
7376ad99 | 1423 | |
0ffcf78a | 1424 | head_target = git_reference_target(head); |
7376ad99 | 1425 | |
0ffcf78a | 1426 | if (head_target && !strcmp(head_target, old_name)) |
5c6ae009 | 1427 | if ((error = git_reference_create_symbolic(&head, ref->owner, "HEAD", ref->name, 1)) < GIT_SUCCESS) |
0ffcf78a | 1428 | goto rollback; |
7376ad99 | 1429 | |
0ffcf78a MS |
1430 | cleanup: |
1431 | free(old_name); | |
7376ad99 | 1432 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to rename reference"); |
7376ad99 | 1433 | |
0ffcf78a MS |
1434 | rollback: |
1435 | /* | |
1436 | * Try to create the old reference again. | |
1437 | */ | |
1438 | if (ref->type & GIT_REF_SYMBOLIC) | |
1439 | error = git_reference_create_symbolic(&new_ref, ref->owner, old_name, target_ref, 0); | |
1440 | else | |
1441 | error = git_reference_create_oid(&new_ref, ref->owner, old_name, target_oid, 0); | |
1442 | ||
1443 | ref->name = old_name; | |
1444 | ||
1445 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to rename reference. Failed to rollback"); | |
1446 | } | |
7376ad99 | 1447 | |
87d3acf4 VM |
1448 | /* |
1449 | * Delete a reference. | |
1450 | * | |
1451 | * If the reference is packed, this is an expensive | |
1452 | * operation. We need to remove the reference from | |
1453 | * the memory cache and then rewrite the whole pack | |
1454 | * | |
5ad0351d | 1455 | * If the reference is loose, we remove it on |
87d3acf4 | 1456 | * the filesystem and update the in-memory cache |
5ad0351d | 1457 | * accordingly. We also make sure that an older version |
1458 | * of it doesn't exist as a packed reference. If this | |
1459 | * is the case, this packed reference is removed as well. | |
87d3acf4 VM |
1460 | * |
1461 | * This obviously invalidates the `ref` pointer. | |
1462 | */ | |
1463 | int git_reference_delete(git_reference *ref) | |
1464 | { | |
1465 | int error; | |
5ad0351d | 1466 | git_reference *reference; |
87d3acf4 VM |
1467 | |
1468 | assert(ref); | |
1469 | ||
1470 | if (ref->type & GIT_REF_PACKED) { | |
d79f1da6 VM |
1471 | /* load the existing packfile */ |
1472 | if ((error = packed_load(ref->owner)) < GIT_SUCCESS) | |
5bdf7b9f | 1473 | return git__rethrow(error, "Failed to delete reference"); |
932d1baf | 1474 | |
2b397327 VM |
1475 | if (git_hashtable_remove(ref->owner->references.packfile, ref->name) < GIT_SUCCESS) |
1476 | return git__throw(GIT_ENOTFOUND, "Reference not found"); | |
1477 | ||
87d3acf4 VM |
1478 | error = packed_write(ref->owner); |
1479 | } else { | |
1480 | char full_path[GIT_PATH_MAX]; | |
f79026b4 | 1481 | git_path_join(full_path, ref->owner->path_repository, ref->name); |
87d3acf4 | 1482 | git_hashtable_remove(ref->owner->references.loose_cache, ref->name); |
f79026b4 | 1483 | error = p_unlink(full_path); |
5ad0351d | 1484 | if (error < GIT_SUCCESS) |
1485 | goto cleanup; | |
1486 | ||
1487 | /* When deleting a loose reference, we have to ensure that an older | |
1488 | * packed version of it doesn't exist | |
1489 | */ | |
5de079b8 | 1490 | if (!git_reference_lookup(&reference, ref->owner, ref->name)) { |
5ad0351d | 1491 | assert((reference->type & GIT_REF_PACKED) != 0); |
1492 | error = git_reference_delete(reference); | |
1493 | } | |
87d3acf4 VM |
1494 | } |
1495 | ||
5ad0351d | 1496 | cleanup: |
87d3acf4 | 1497 | reference_free(ref); |
5bdf7b9f | 1498 | return error == GIT_SUCCESS ? GIT_SUCCESS : git__rethrow(error, "Failed to delete reference"); |
87d3acf4 VM |
1499 | } |
1500 | ||
87d3acf4 VM |
1501 | int git_reference_resolve(git_reference **resolved_ref, git_reference *ref) |
1502 | { | |
1503 | git_repository *repo; | |
1504 | int error, i; | |
1505 | ||
1506 | assert(resolved_ref && ref); | |
1507 | *resolved_ref = NULL; | |
7341bf87 VM |
1508 | |
1509 | if ((error = loose_update(ref)) < GIT_SUCCESS) | |
5bdf7b9f | 1510 | return git__rethrow(error, "Failed to resolve reference"); |
932d1baf | 1511 | |
87d3acf4 VM |
1512 | repo = ref->owner; |
1513 | ||
1514 | for (i = 0; i < MAX_NESTING_LEVEL; ++i) { | |
1515 | reference_symbolic *ref_sym; | |
1516 | ||
68a146c1 CMN |
1517 | *resolved_ref = ref; |
1518 | ||
0d5d5190 | 1519 | if (ref->type & GIT_REF_OID) |
87d3acf4 | 1520 | return GIT_SUCCESS; |
87d3acf4 VM |
1521 | |
1522 | ref_sym = (reference_symbolic *)ref; | |
5de079b8 | 1523 | if ((error = git_reference_lookup(&ref, repo, ref_sym->target)) < GIT_SUCCESS) |
0d5d5190 | 1524 | return error; |
87d3acf4 VM |
1525 | } |
1526 | ||
0d5d5190 | 1527 | return git__throw(GIT_ENOMEM, "Failed to resolve reference. Reference is too nested"); |
87d3acf4 VM |
1528 | } |
1529 | ||
1530 | int git_reference_packall(git_repository *repo) | |
1531 | { | |
1532 | int error; | |
1533 | ||
1534 | /* load the existing packfile */ | |
1535 | if ((error = packed_load(repo)) < GIT_SUCCESS) | |
5bdf7b9f | 1536 | return git__rethrow(error, "Failed to pack references"); |
87d3acf4 VM |
1537 | |
1538 | /* update it in-memory with all the loose references */ | |
1539 | if ((error = packed_loadloose(repo)) < GIT_SUCCESS) | |
5bdf7b9f | 1540 | return git__rethrow(error, "Failed to pack references"); |
87d3acf4 VM |
1541 | |
1542 | /* write it back to disk */ | |
1543 | return packed_write(repo); | |
1544 | } | |
1545 | ||
43521d06 | 1546 | int git_reference_foreach(git_repository *repo, unsigned int list_flags, int (*callback)(const char *, void *), void *payload) |
00571828 VM |
1547 | { |
1548 | int error; | |
1549 | struct dirent_list_data data; | |
1550 | char refs_path[GIT_PATH_MAX]; | |
1551 | ||
7ad96e51 | 1552 | /* list all the packed references first */ |
00571828 VM |
1553 | if (list_flags & GIT_REF_PACKED) { |
1554 | const char *ref_name; | |
402a47a7 | 1555 | void *GIT_UNUSED(_unused); |
00571828 | 1556 | |
09e8de0f | 1557 | if ((error = packed_load(repo)) < GIT_SUCCESS) |
5bdf7b9f | 1558 | return git__rethrow(error, "Failed to list references"); |
00571828 VM |
1559 | |
1560 | GIT_HASHTABLE_FOREACH(repo->references.packfile, ref_name, _unused, | |
09e8de0f | 1561 | if ((error = callback(ref_name, payload)) < GIT_SUCCESS) |
0d5d5190 | 1562 | return git__throw(error, "Failed to list references. User callback failed"); |
00571828 VM |
1563 | ); |
1564 | } | |
1565 | ||
7ad96e51 VM |
1566 | /* now list the loose references, trying not to |
1567 | * duplicate the ref names already in the packed-refs file */ | |
09e8de0f VM |
1568 | |
1569 | data.repo_path_len = strlen(repo->path_repository); | |
1570 | data.list_flags = list_flags; | |
1571 | data.repo = repo; | |
1572 | data.callback = callback; | |
1573 | data.callback_payload = payload; | |
1574 | ||
1575 | ||
f79026b4 VM |
1576 | git_path_join(refs_path, repo->path_repository, GIT_REFS_DIR); |
1577 | return git_futils_direach(refs_path, GIT_PATH_MAX, _dirent_loose_listall, &data); | |
09e8de0f VM |
1578 | } |
1579 | ||
1580 | int cb__reflist_add(const char *ref, void *data) | |
1581 | { | |
1582 | return git_vector_insert((git_vector *)data, git__strdup(ref)); | |
1583 | } | |
1584 | ||
1585 | int git_reference_listall(git_strarray *array, git_repository *repo, unsigned int list_flags) | |
1586 | { | |
1587 | int error; | |
1588 | git_vector ref_list; | |
1589 | ||
1590 | assert(array && repo); | |
1591 | ||
1592 | array->strings = NULL; | |
1593 | array->count = 0; | |
1594 | ||
1595 | if (git_vector_init(&ref_list, 8, NULL) < GIT_SUCCESS) | |
1596 | return GIT_ENOMEM; | |
1597 | ||
43521d06 | 1598 | error = git_reference_foreach(repo, list_flags, &cb__reflist_add, (void *)&ref_list); |
7ad96e51 VM |
1599 | |
1600 | if (error < GIT_SUCCESS) { | |
09e8de0f | 1601 | git_vector_free(&ref_list); |
0d5d5190 | 1602 | return error; |
7ad96e51 VM |
1603 | } |
1604 | ||
09e8de0f VM |
1605 | array->strings = (char **)ref_list.contents; |
1606 | array->count = ref_list.length; | |
00571828 VM |
1607 | return GIT_SUCCESS; |
1608 | } | |
87d3acf4 VM |
1609 | |
1610 | ||
1611 | ||
1612 | ||
1613 | /***************************************** | |
1614 | * Init/free (repository API) | |
1615 | *****************************************/ | |
2f8a8ab2 VM |
1616 | int git_repository__refcache_init(git_refcache *refs) |
1617 | { | |
1618 | assert(refs); | |
9282e921 | 1619 | |
87d3acf4 | 1620 | refs->loose_cache = git_hashtable_alloc( |
86194b24 VM |
1621 | default_table_size, |
1622 | reftable_hash, | |
1623 | (git_hash_keyeq_ptr)strcmp); | |
1624 | ||
87d3acf4 VM |
1625 | /* packfile loaded lazily */ |
1626 | refs->packfile = NULL; | |
9282e921 | 1627 | |
87d3acf4 | 1628 | return (refs->loose_cache) ? GIT_SUCCESS : GIT_ENOMEM; |
2f8a8ab2 | 1629 | } |
9282e921 | 1630 | |
2f8a8ab2 VM |
1631 | void git_repository__refcache_free(git_refcache *refs) |
1632 | { | |
2f8a8ab2 | 1633 | git_reference *reference; |
402a47a7 | 1634 | const void *GIT_UNUSED(_unused); |
9282e921 | 1635 | |
2f8a8ab2 VM |
1636 | assert(refs); |
1637 | ||
87d3acf4 | 1638 | GIT_HASHTABLE_FOREACH(refs->loose_cache, _unused, reference, |
86194b24 VM |
1639 | reference_free(reference); |
1640 | ); | |
1641 | ||
87d3acf4 | 1642 | git_hashtable_free(refs->loose_cache); |
2f8a8ab2 | 1643 | |
87d3acf4 VM |
1644 | if (refs->packfile) { |
1645 | GIT_HASHTABLE_FOREACH(refs->packfile, _unused, reference, | |
1646 | reference_free(reference); | |
1647 | ); | |
1648 | ||
1649 | git_hashtable_free(refs->packfile); | |
1650 | } | |
9282e921 | 1651 | } |
2f8a8ab2 | 1652 | |
87d3acf4 VM |
1653 | |
1654 | ||
1655 | /***************************************** | |
1656 | * Name normalization | |
1657 | *****************************************/ | |
aa2120e9 | 1658 | static int check_valid_ref_char(char ch) |
1659 | { | |
1660 | if (ch <= ' ') | |
0d5d5190 | 1661 | return GIT_ERROR; |
aa2120e9 | 1662 | |
1663 | switch (ch) { | |
1664 | case '~': | |
1665 | case '^': | |
1666 | case ':': | |
1667 | case '\\': | |
1668 | case '?': | |
1669 | case '[': | |
e1be1028 | 1670 | case '*': |
0d5d5190 | 1671 | return GIT_ERROR; |
aa2120e9 | 1672 | break; |
1673 | ||
1674 | default: | |
1675 | return GIT_SUCCESS; | |
1676 | } | |
1677 | } | |
1678 | ||
3101a3e5 | 1679 | static int normalize_name(char *buffer_out, size_t out_size, const char *name, int is_oid_ref) |
aa2120e9 | 1680 | { |
aa2120e9 | 1681 | const char *name_end, *buffer_out_start; |
1682 | char *current; | |
1683 | int contains_a_slash = 0; | |
1684 | ||
1685 | assert(name && buffer_out); | |
1686 | ||
1687 | buffer_out_start = buffer_out; | |
1688 | current = (char *)name; | |
1689 | name_end = name + strlen(name); | |
1690 | ||
3101a3e5 VM |
1691 | /* Terminating null byte */ |
1692 | out_size--; | |
1693 | ||
aa2120e9 | 1694 | /* A refname can not be empty */ |
1695 | if (name_end == name) | |
5bdf7b9f | 1696 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name is empty"); |
aa2120e9 | 1697 | |
1698 | /* A refname can not end with a dot or a slash */ | |
1699 | if (*(name_end - 1) == '.' || *(name_end - 1) == '/') | |
5bdf7b9f | 1700 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name ends with dot or slash"); |
aa2120e9 | 1701 | |
3101a3e5 | 1702 | while (current < name_end && out_size) { |
aa2120e9 | 1703 | if (check_valid_ref_char(*current)) |
0d5d5190 | 1704 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name contains invalid characters"); |
aa2120e9 | 1705 | |
1706 | if (buffer_out > buffer_out_start) { | |
1707 | char prev = *(buffer_out - 1); | |
1708 | ||
1709 | /* A refname can not start with a dot nor contain a double dot */ | |
1710 | if (*current == '.' && ((prev == '.') || (prev == '/'))) | |
5bdf7b9f | 1711 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name starts with a dot or contains a double dot"); |
aa2120e9 | 1712 | |
1713 | /* '@{' is forbidden within a refname */ | |
1714 | if (*current == '{' && prev == '@') | |
5bdf7b9f | 1715 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name contains '@{'"); |
aa2120e9 | 1716 | |
1717 | /* Prevent multiple slashes from being added to the output */ | |
1718 | if (*current == '/' && prev == '/') { | |
1719 | current++; | |
1720 | continue; | |
1721 | } | |
1722 | } | |
1723 | ||
e1be1028 | 1724 | if (*current == '/') |
aa2120e9 | 1725 | contains_a_slash = 1; |
aa2120e9 | 1726 | |
1727 | *buffer_out++ = *current++; | |
3101a3e5 | 1728 | out_size--; |
aa2120e9 | 1729 | } |
1730 | ||
3101a3e5 VM |
1731 | if (!out_size) |
1732 | return git__throw(GIT_EINVALIDREFNAME, "Reference name is too long"); | |
1733 | ||
83c95128 | 1734 | /* Object id refname have to contain at least one slash, except |
df30eac1 JP |
1735 | * for HEAD in a detached state or MERGE_HEAD if we're in the |
1736 | * middle of a merge */ | |
1737 | if (is_oid_ref && !contains_a_slash && (strcmp(name, GIT_HEAD_FILE) && strcmp(name, GIT_MERGE_HEAD_FILE))) | |
0d5d5190 | 1738 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name contains no slashes"); |
aa2120e9 | 1739 | |
1740 | /* A refname can not end with ".lock" */ | |
1741 | if (!git__suffixcmp(name, GIT_FILELOCK_EXTENSION)) | |
0d5d5190 | 1742 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name ends with '.lock'"); |
aa2120e9 | 1743 | |
1744 | *buffer_out = '\0'; | |
1745 | ||
83c95128 CMN |
1746 | /* |
1747 | * For object id references, name has to start with refs/. Again, | |
1748 | * we need to allow HEAD to be in a detached state. | |
1749 | */ | |
0d5d5190 VM |
1750 | if (is_oid_ref && !(git__prefixcmp(buffer_out_start, GIT_REFS_DIR) || |
1751 | strcmp(buffer_out_start, GIT_HEAD_FILE))) | |
5bdf7b9f | 1752 | return git__throw(GIT_EINVALIDREFNAME, "Failed to normalize name. Reference name does not start with 'refs/'"); |
aa2120e9 | 1753 | |
0d5d5190 | 1754 | return GIT_SUCCESS; |
aa2120e9 | 1755 | } |
2f8a8ab2 | 1756 | |
3101a3e5 | 1757 | int git_reference__normalize_name(char *buffer_out, size_t out_size, const char *name) |
86194b24 | 1758 | { |
3101a3e5 | 1759 | return normalize_name(buffer_out, out_size, name, 0); |
86194b24 VM |
1760 | } |
1761 | ||
3101a3e5 | 1762 | int git_reference__normalize_name_oid(char *buffer_out, size_t out_size, const char *name) |
86194b24 | 1763 | { |
3101a3e5 | 1764 | return normalize_name(buffer_out, out_size, name, 1); |
86194b24 VM |
1765 | } |
1766 | ||
1767 |