{{ message }}
Repository navigation
Expand file tree
/
Copy pathattrcache.c
More file actions
449 lines (356 loc) · 10.3 KB
/
Copy pathattrcache.c
File metadata and controls
449 lines (356 loc) · 10.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
#include "common.h"
#include "repository.h"
#include "attr_file.h"
#include "config.h"
#include "sysdir.h"
#include "ignore.h"
GIT__USE_STRMAP;
GIT_INLINE(int) attr_cache_lock(git_attr_cache *cache)
{
GIT_UNUSED(cache); /* avoid warning if threading is off */
if (git_mutex_lock(&cache->lock) < 0) {
giterr_set(GITERR_OS, "Unable to get attr cache lock");
return -1;
}
return 0;
}
GIT_INLINE(void) attr_cache_unlock(git_attr_cache *cache)
{
GIT_UNUSED(cache); /* avoid warning if threading is off */
git_mutex_unlock(&cache->lock);
}
GIT_INLINE(git_attr_file_entry *) attr_cache_lookup_entry(
git_attr_cache *cache, const char *path)
{
khiter_t pos = git_strmap_lookup_index(cache->files, path);
if (git_strmap_valid_index(cache->files, pos))
return git_strmap_value_at(cache->files, pos);
else
return NULL;
}
int git_attr_cache__alloc_file_entry(
git_attr_file_entry **out,
const char *base,
const char *path,
git_pool *pool)
{
size_t baselen = 0, pathlen = strlen(path);
size_t cachesize = sizeof(git_attr_file_entry) + pathlen + 1;
git_attr_file_entry *ce;
if (base != NULL && git_path_root(path) < 0) {
baselen = strlen(base);
cachesize += baselen;
if (baselen && base[baselen - 1] != '/')
cachesize++;
}
ce = git_pool_mallocz(pool, (uint32_t)cachesize);
GITERR_CHECK_ALLOC(ce);
if (baselen) {
memcpy(ce->fullpath, base, baselen);
if (base[baselen - 1] != '/')
ce->fullpath[baselen++] = '/';
}
memcpy(&ce->fullpath[baselen], path, pathlen);
ce->path = &ce->fullpath[baselen];
*out = ce;
return 0;
}
/* call with attrcache locked */
static int attr_cache_make_entry(
git_attr_file_entry **out, git_repository *repo, const char *path)
{
int error = 0;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_attr_file_entry *entry = NULL;
error = git_attr_cache__alloc_file_entry(
&entry, git_repository_workdir(repo), path, &cache->pool);
if (!error) {
git_strmap_insert(cache->files, entry->path, entry, error);
if (error > 0)
error = 0;
}
*out = entry;
return error;
}
/* insert entry or replace existing if we raced with another thread */
static int attr_cache_upsert(git_attr_cache *cache, git_attr_file *file)
{
git_attr_file_entry *entry;
git_attr_file *old;
if (attr_cache_lock(cache) < 0)
return -1;
entry = attr_cache_lookup_entry(cache, file->entry->path);
GIT_REFCOUNT_OWN(file, entry);
GIT_REFCOUNT_INC(file);
old = git__compare_and_swap(
&entry->file[file->source], entry->file[file->source], file);
if (old) {
GIT_REFCOUNT_OWN(old, NULL);
git_attr_file__free(old);
}
attr_cache_unlock(cache);
return 0;
}
static int attr_cache_remove(git_attr_cache *cache, git_attr_file *file)
{
int error = 0;
git_attr_file_entry *entry;
if (!file)
return 0;
if ((error = attr_cache_lock(cache)) < 0)
return error;
if ((entry = attr_cache_lookup_entry(cache, file->entry->path)) != NULL)
file = git__compare_and_swap(&entry->file[file->source], file, NULL);
attr_cache_unlock(cache);
if (file) {
GIT_REFCOUNT_OWN(file, NULL);
git_attr_file__free(file);
}
return error;
}
/* Look up cache entry and file.
* - If entry is not present, create it while the cache is locked.
* - If file is present, increment refcount before returning it, so the
* cache can be unlocked and it won't go away.
*/
static int attr_cache_lookup(
git_attr_file **out_file,
git_attr_file_entry **out_entry,
git_repository *repo,
git_attr_file_source source,
const char *base,
const char *filename)
{
int error = 0;
git_buf path = GIT_BUF_INIT;
const char *wd = git_repository_workdir(repo), *relfile;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_attr_file_entry *entry = NULL;
git_attr_file *file = NULL;
/* join base and path as needed */
if (base != NULL && git_path_root(filename) < 0) {
if (git_buf_joinpath(&path, base, filename) < 0)
return -1;
filename = path.ptr;
}
relfile = filename;
if (wd && !git__prefixcmp(relfile, wd))
relfile += strlen(wd);
/* check cache for existing entry */
if ((error = attr_cache_lock(cache)) < 0)
goto cleanup;
entry = attr_cache_lookup_entry(cache, relfile);
if (!entry)
error = attr_cache_make_entry(&entry, repo, relfile);
else if (entry->file[source] != NULL) {
file = entry->file[source];
GIT_REFCOUNT_INC(file);
}
attr_cache_unlock(cache);
cleanup:
*out_file = file;
*out_entry = entry;
git_buf_free(&path);
return error;
}
int git_attr_cache__get(
git_attr_file **out,
git_repository *repo,
git_attr_file_source source,
const char *base,
const char *filename,
git_attr_file_parser parser)
{
int error = 0;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_attr_file_entry *entry = NULL;
git_attr_file *file = NULL, *updated = NULL;
if ((error = attr_cache_lookup(
&file, &entry, repo, source, base, filename)) < 0)
return error;
/* load file if we don't have one or if existing one is out of date */
if (!file || (error = git_attr_file__out_of_date(repo, file)) > 0)
error = git_attr_file__load(&updated, repo, entry, source, parser);
/* if we loaded the file, insert into and/or update cache */
if (updated) {
if ((error = attr_cache_upsert(cache, updated)) < 0)
git_attr_file__free(updated);
else {
git_attr_file__free(file); /* offset incref from lookup */
file = updated;
}
}
/* if file could not be loaded */
if (error < 0) {
/* remove existing entry */
if (file) {
attr_cache_remove(cache, file);
git_attr_file__free(file); /* offset incref from lookup */
file = NULL;
}
/* no error if file simply doesn't exist */
if (error == GIT_ENOTFOUND) {
giterr_clear();
error = 0;
}
}
*out = file;
return error;
}
bool git_attr_cache__is_cached(
git_repository *repo,
git_attr_file_source source,
const char *filename)
{
git_attr_cache *cache = git_repository_attr_cache(repo);
git_strmap *files;
khiter_t pos;
git_attr_file_entry *entry;
if (!cache || !(files = cache->files))
return false;
pos = git_strmap_lookup_index(files, filename);
if (!git_strmap_valid_index(files, pos))
return false;
entry = git_strmap_value_at(files, pos);
return entry && (entry->file[source] != NULL);
}
static int attr_cache__lookup_path(
char **out, git_config *cfg, const char *key, const char *fallback)
{
git_buf buf = GIT_BUF_INIT;
int error;
const git_config_entry *entry = NULL;
*out = NULL;
if ((error = git_config__lookup_entry(&entry, cfg, key, false)) < 0)
return error;
if (entry) {
const char *cfgval = entry->value;
/* expand leading ~/ as needed */
if (cfgval && cfgval[0] == '~' && cfgval[1] == '/' &&
!git_sysdir_find_global_file(&buf, &cfgval[2]))
*out = git_buf_detach(&buf);
else if (cfgval)
*out = git__strdup(cfgval);
}
else if (!git_sysdir_find_xdg_file(&buf, fallback))
*out = git_buf_detach(&buf);
git_buf_free(&buf);
return error;
}
static void attr_cache__free(git_attr_cache *cache)
{
bool unlock;
if (!cache)
return;
unlock = (git_mutex_lock(&cache->lock) == 0);
if (cache->files != NULL) {
git_attr_file_entry *entry;
git_attr_file *file;
int i;
git_strmap_foreach_value(cache->files, entry, {
for (i = 0; i < GIT_ATTR_FILE_NUM_SOURCES; ++i) {
if ((file = git__swap(entry->file[i], NULL)) != NULL) {
GIT_REFCOUNT_OWN(file, NULL);
git_attr_file__free(file);
}
}
});
git_strmap_free(cache->files);
}
if (cache->macros != NULL) {
git_attr_rule *rule;
git_strmap_foreach_value(cache->macros, rule, {
git_attr_rule__free(rule);
});
git_strmap_free(cache->macros);
}
git_pool_clear(&cache->pool);
git__free(cache->cfg_attr_file);
cache->cfg_attr_file = NULL;
git__free(cache->cfg_excl_file);
cache->cfg_excl_file = NULL;
if (unlock)
git_mutex_unlock(&cache->lock);
git_mutex_free(&cache->lock);
git__free(cache);
}
int git_attr_cache__do_init(git_repository *repo)
{
int ret = 0;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_config *cfg = NULL;
if (cache)
return 0;
cache = git__calloc(1, sizeof(git_attr_cache));
GITERR_CHECK_ALLOC(cache);
/* set up lock */
if (git_mutex_init(&cache->lock) < 0) {
giterr_set(GITERR_OS, "Unable to initialize lock for attr cache");
git__free(cache);
return -1;
}
if ((ret = git_repository_config_snapshot(&cfg, repo)) < 0)
goto cancel;
/* cache config settings for attributes and ignores */
ret = attr_cache__lookup_path(
&cache->cfg_attr_file, cfg, GIT_ATTR_CONFIG, GIT_ATTR_FILE_XDG);
if (ret < 0)
goto cancel;
ret = attr_cache__lookup_path(
&cache->cfg_excl_file, cfg, GIT_IGNORE_CONFIG, GIT_IGNORE_FILE_XDG);
if (ret < 0)
goto cancel;
/* allocate hashtable for attribute and ignore file contents,
* hashtable for attribute macros, and string pool
*/
if ((ret = git_strmap_alloc(&cache->files)) < 0 ||
(ret = git_strmap_alloc(&cache->macros)) < 0 ||
(ret = git_pool_init(&cache->pool, 1, 0)) < 0)
goto cancel;
cache = git__compare_and_swap(&repo->attrcache, NULL, cache);
if (cache)
goto cancel; /* raced with another thread, free this but no error */
git_config_free(cfg);
/* insert default macros */
return git_attr_add_macro(repo, "binary", "-diff -crlf -text");
cancel:
attr_cache__free(cache);
git_config_free(cfg);
return ret;
}
void git_attr_cache_flush(git_repository *repo)
{
git_attr_cache *cache;
/* this could be done less expensively, but for now, we'll just free
* the entire attrcache and let the next use reinitialize it...
*/
if (repo && (cache = git__swap(repo->attrcache, NULL)) != NULL)
attr_cache__free(cache);
}
int git_attr_cache__insert_macro(git_repository *repo, git_attr_rule *macro)
{
git_attr_cache *cache = git_repository_attr_cache(repo);
git_strmap *macros = cache->macros;
int error;
/* TODO: generate warning log if (macro->assigns.length == 0) */
if (macro->assigns.length == 0)
return 0;
if (git_mutex_lock(&cache->lock) < 0) {
giterr_set(GITERR_OS, "Unable to get attr cache lock");
error = -1;
} else {
git_strmap_insert(macros, macro->match.pattern, macro, error);
git_mutex_unlock(&cache->lock);
}
return (error < 0) ? -1 : 0;
}
git_attr_rule *git_attr_cache__lookup_macro(
git_repository *repo, const char *name)
{
git_strmap *macros = git_repository_attr_cache(repo)->macros;
khiter_t pos;
pos = git_strmap_lookup_index(macros, name);
if (!git_strmap_valid_index(macros, pos))
return NULL;
return (git_attr_rule *)git_strmap_value_at(macros, pos);
}
You can’t perform that action at this time.