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Commit | Line | Data |
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f859c846 | 1 | #include "cache.h" |
f394e093 | 2 | #include "gettext.h" |
e38da487 | 3 | #include "setup.h" |
f859c846 | 4 | |
fab78a0c MT |
5 | static int threaded_check_leading_path(struct cache_def *cache, const char *name, |
6 | int len, int warn_on_lstat_err); | |
72f3196a JH |
7 | static int threaded_has_dirs_only_path(struct cache_def *cache, const char *name, int len, int prefix_len); |
8 | ||
92604b46 KB |
9 | /* |
10 | * Returns the length (on a path component basis) of the longest | |
148bc06b | 11 | * common prefix match of 'name_a' and 'name_b'. |
92604b46 | 12 | */ |
148bc06b KB |
13 | static int longest_path_match(const char *name_a, int len_a, |
14 | const char *name_b, int len_b, | |
15 | int *previous_slash) | |
c40641b7 | 16 | { |
aeabab5c | 17 | int max_len, match_len = 0, match_len_prev = 0, i = 0; |
92604b46 | 18 | |
148bc06b KB |
19 | max_len = len_a < len_b ? len_a : len_b; |
20 | while (i < max_len && name_a[i] == name_b[i]) { | |
21 | if (name_a[i] == '/') { | |
aeabab5c | 22 | match_len_prev = match_len; |
92604b46 | 23 | match_len = i; |
aeabab5c | 24 | } |
92604b46 KB |
25 | i++; |
26 | } | |
60b458b7 | 27 | /* |
148bc06b KB |
28 | * Is 'name_b' a substring of 'name_a', the other way around, |
29 | * or is 'name_a' and 'name_b' the exact same string? | |
60b458b7 | 30 | */ |
148bc06b KB |
31 | if (i >= max_len && ((len_a > len_b && name_a[len_b] == '/') || |
32 | (len_a < len_b && name_b[len_a] == '/') || | |
33 | (len_a == len_b))) { | |
aeabab5c | 34 | match_len_prev = match_len; |
60b458b7 | 35 | match_len = i; |
aeabab5c KB |
36 | } |
37 | *previous_slash = match_len_prev; | |
92604b46 | 38 | return match_len; |
c40641b7 LT |
39 | } |
40 | ||
e7c73053 | 41 | static struct cache_def default_cache = CACHE_DEF_INIT; |
148bc06b | 42 | |
867f72bf | 43 | static inline void reset_lstat_cache(struct cache_def *cache) |
c40641b7 | 44 | { |
e7c73053 | 45 | strbuf_reset(&cache->path); |
867f72bf | 46 | cache->flags = 0; |
60b458b7 KB |
47 | /* |
48 | * The track_flags and prefix_len_stat_func members is only | |
49 | * set by the safeguard rule inside lstat_cache() | |
50 | */ | |
c40641b7 LT |
51 | } |
52 | ||
92604b46 | 53 | #define FL_DIR (1 << 0) |
09c93066 KB |
54 | #define FL_NOENT (1 << 1) |
55 | #define FL_SYMLINK (1 << 2) | |
56 | #define FL_LSTATERR (1 << 3) | |
57 | #define FL_ERR (1 << 4) | |
bad4a54f | 58 | #define FL_FULLPATH (1 << 5) |
92604b46 KB |
59 | |
60 | /* | |
61 | * Check if name 'name' of length 'len' has a symlink leading | |
09c93066 | 62 | * component, or if the directory exists and is real, or not. |
92604b46 KB |
63 | * |
64 | * To speed up the check, some information is allowed to be cached. | |
bad4a54f KB |
65 | * This can be indicated by the 'track_flags' argument, which also can |
66 | * be used to indicate that we should check the full path. | |
67 | * | |
68 | * The 'prefix_len_stat_func' parameter can be used to set the length | |
69 | * of the prefix, where the cache should use the stat() function | |
70 | * instead of the lstat() function to test each path component. | |
92604b46 | 71 | */ |
4856ff2a CB |
72 | static int lstat_cache_matchlen(struct cache_def *cache, |
73 | const char *name, int len, | |
74 | int *ret_flags, int track_flags, | |
75 | int prefix_len_stat_func) | |
c40641b7 | 76 | { |
aeabab5c | 77 | int match_len, last_slash, last_slash_dir, previous_slash; |
fab78a0c | 78 | int save_flags, ret, saved_errno = 0; |
c40641b7 | 79 | struct stat st; |
f859c846 | 80 | |
867f72bf LT |
81 | if (cache->track_flags != track_flags || |
82 | cache->prefix_len_stat_func != prefix_len_stat_func) { | |
09c93066 | 83 | /* |
60b458b7 KB |
84 | * As a safeguard rule we clear the cache if the |
85 | * values of track_flags and/or prefix_len_stat_func | |
86 | * does not match with the last supplied values. | |
09c93066 | 87 | */ |
867f72bf LT |
88 | reset_lstat_cache(cache); |
89 | cache->track_flags = track_flags; | |
90 | cache->prefix_len_stat_func = prefix_len_stat_func; | |
09c93066 KB |
91 | match_len = last_slash = 0; |
92 | } else { | |
93 | /* | |
94 | * Check to see if we have a match from the cache for | |
95 | * the 2 "excluding" path types. | |
96 | */ | |
aeabab5c | 97 | match_len = last_slash = |
e7c73053 KB |
98 | longest_path_match(name, len, cache->path.buf, |
99 | cache->path.len, &previous_slash); | |
4856ff2a | 100 | *ret_flags = cache->flags & track_flags & (FL_NOENT|FL_SYMLINK); |
77716755 KB |
101 | |
102 | if (!(track_flags & FL_FULLPATH) && match_len == len) | |
103 | match_len = last_slash = previous_slash; | |
104 | ||
e7c73053 | 105 | if (*ret_flags && match_len == cache->path.len) |
4856ff2a | 106 | return match_len; |
09c93066 KB |
107 | /* |
108 | * If we now have match_len > 0, we would know that | |
109 | * the matched part will always be a directory. | |
110 | * | |
111 | * Also, if we are tracking directories and 'name' is | |
112 | * a substring of the cache on a path component basis, | |
113 | * we can return immediately. | |
114 | */ | |
4856ff2a CB |
115 | *ret_flags = track_flags & FL_DIR; |
116 | if (*ret_flags && len == match_len) | |
117 | return match_len; | |
09c93066 | 118 | } |
c40641b7 | 119 | |
92604b46 KB |
120 | /* |
121 | * Okay, no match from the cache so far, so now we have to | |
122 | * check the rest of the path components. | |
123 | */ | |
4856ff2a | 124 | *ret_flags = FL_DIR; |
92604b46 | 125 | last_slash_dir = last_slash; |
e7c73053 KB |
126 | if (len > cache->path.len) |
127 | strbuf_grow(&cache->path, len - cache->path.len); | |
128 | while (match_len < len) { | |
92604b46 | 129 | do { |
e7c73053 | 130 | cache->path.buf[match_len] = name[match_len]; |
92604b46 | 131 | match_len++; |
e7c73053 KB |
132 | } while (match_len < len && name[match_len] != '/'); |
133 | if (match_len >= len && !(track_flags & FL_FULLPATH)) | |
92604b46 KB |
134 | break; |
135 | last_slash = match_len; | |
e7c73053 | 136 | cache->path.buf[last_slash] = '\0'; |
f859c846 | 137 | |
bad4a54f | 138 | if (last_slash <= prefix_len_stat_func) |
e7c73053 | 139 | ret = stat(cache->path.buf, &st); |
bad4a54f | 140 | else |
e7c73053 | 141 | ret = lstat(cache->path.buf, &st); |
bad4a54f KB |
142 | |
143 | if (ret) { | |
4856ff2a | 144 | *ret_flags = FL_LSTATERR; |
fab78a0c | 145 | saved_errno = errno; |
09c93066 | 146 | if (errno == ENOENT) |
4856ff2a | 147 | *ret_flags |= FL_NOENT; |
92604b46 KB |
148 | } else if (S_ISDIR(st.st_mode)) { |
149 | last_slash_dir = last_slash; | |
c40641b7 | 150 | continue; |
92604b46 | 151 | } else if (S_ISLNK(st.st_mode)) { |
4856ff2a | 152 | *ret_flags = FL_SYMLINK; |
92604b46 | 153 | } else { |
4856ff2a | 154 | *ret_flags = FL_ERR; |
f859c846 | 155 | } |
c40641b7 | 156 | break; |
f859c846 | 157 | } |
92604b46 KB |
158 | |
159 | /* | |
09c93066 KB |
160 | * At the end update the cache. Note that max 3 different |
161 | * path types, FL_NOENT, FL_SYMLINK and FL_DIR, can be cached | |
162 | * for the moment! | |
92604b46 | 163 | */ |
4856ff2a | 164 | save_flags = *ret_flags & track_flags & (FL_NOENT|FL_SYMLINK); |
e7c73053 KB |
165 | if (save_flags && last_slash > 0) { |
166 | cache->path.buf[last_slash] = '\0'; | |
167 | cache->path.len = last_slash; | |
867f72bf | 168 | cache->flags = save_flags; |
e7c73053 | 169 | } else if ((track_flags & FL_DIR) && last_slash_dir > 0) { |
92604b46 KB |
170 | /* |
171 | * We have a separate test for the directory case, | |
09c93066 KB |
172 | * since it could be that we have found a symlink or a |
173 | * non-existing directory and the track_flags says | |
174 | * that we cannot cache this fact, so the cache would | |
175 | * then have been left empty in this case. | |
92604b46 KB |
176 | * |
177 | * But if we are allowed to track real directories, we | |
178 | * can still cache the path components before the last | |
09c93066 | 179 | * one (the found symlink or non-existing component). |
92604b46 | 180 | */ |
e7c73053 KB |
181 | cache->path.buf[last_slash_dir] = '\0'; |
182 | cache->path.len = last_slash_dir; | |
867f72bf | 183 | cache->flags = FL_DIR; |
92604b46 | 184 | } else { |
867f72bf | 185 | reset_lstat_cache(cache); |
92604b46 | 186 | } |
fab78a0c MT |
187 | if (saved_errno) |
188 | errno = saved_errno; | |
4856ff2a CB |
189 | return match_len; |
190 | } | |
191 | ||
192 | static int lstat_cache(struct cache_def *cache, const char *name, int len, | |
193 | int track_flags, int prefix_len_stat_func) | |
194 | { | |
195 | int flags; | |
196 | (void)lstat_cache_matchlen(cache, name, len, &flags, track_flags, | |
197 | prefix_len_stat_func); | |
198 | return flags; | |
92604b46 KB |
199 | } |
200 | ||
bad4a54f KB |
201 | #define USE_ONLY_LSTAT 0 |
202 | ||
b9fd2846 LT |
203 | /* |
204 | * Return non-zero if path 'name' has a leading symlink component | |
205 | */ | |
206 | int threaded_has_symlink_leading_path(struct cache_def *cache, const char *name, int len) | |
207 | { | |
208 | return lstat_cache(cache, name, len, FL_SYMLINK|FL_DIR, USE_ONLY_LSTAT) & FL_SYMLINK; | |
209 | } | |
210 | ||
57199892 | 211 | int has_symlink_leading_path(const char *name, int len) |
92604b46 | 212 | { |
b9fd2846 | 213 | return threaded_has_symlink_leading_path(&default_cache, name, len); |
f859c846 | 214 | } |
09c93066 | 215 | |
fab78a0c | 216 | int check_leading_path(const char *name, int len, int warn_on_lstat_err) |
09c93066 | 217 | { |
fab78a0c MT |
218 | return threaded_check_leading_path(&default_cache, name, len, |
219 | warn_on_lstat_err); | |
15438d5a JH |
220 | } |
221 | ||
222 | /* | |
462b4e8d | 223 | * Return zero if some leading path component of 'name' does not exist. |
15438d5a JH |
224 | * |
225 | * Return -1 if leading path exists and is a directory. | |
226 | * | |
462b4e8d | 227 | * Return the length of a leading component if it either exists but it's not a |
fab78a0c MT |
228 | * directory, or if we were unable to lstat() it. If warn_on_lstat_err is true, |
229 | * also emit a warning for this error. | |
15438d5a | 230 | */ |
fab78a0c MT |
231 | static int threaded_check_leading_path(struct cache_def *cache, const char *name, |
232 | int len, int warn_on_lstat_err) | |
15438d5a | 233 | { |
f66caaf9 CB |
234 | int flags; |
235 | int match_len = lstat_cache_matchlen(cache, name, len, &flags, | |
236 | FL_SYMLINK|FL_NOENT|FL_DIR, USE_ONLY_LSTAT); | |
fab78a0c MT |
237 | int saved_errno = errno; |
238 | ||
1d718a51 | 239 | if (flags & FL_NOENT) |
f66caaf9 CB |
240 | return 0; |
241 | else if (flags & FL_DIR) | |
242 | return -1; | |
fab78a0c MT |
243 | if (warn_on_lstat_err && (flags & FL_LSTATERR)) { |
244 | char *path = xmemdupz(name, match_len); | |
245 | errno = saved_errno; | |
246 | warning_errno(_("failed to lstat '%s'"), path); | |
247 | free(path); | |
248 | } | |
249 | return match_len; | |
09c93066 | 250 | } |
bad4a54f | 251 | |
57199892 | 252 | int has_dirs_only_path(const char *name, int len, int prefix_len) |
bad4a54f | 253 | { |
15438d5a JH |
254 | return threaded_has_dirs_only_path(&default_cache, name, len, prefix_len); |
255 | } | |
256 | ||
257 | /* | |
258 | * Return non-zero if all path components of 'name' exists as a | |
259 | * directory. If prefix_len > 0, we will test with the stat() | |
260 | * function instead of the lstat() function for a prefix length of | |
261 | * 'prefix_len', thus we then allow for symlinks in the prefix part as | |
262 | * long as those points to real existing directories. | |
263 | */ | |
72f3196a | 264 | static int threaded_has_dirs_only_path(struct cache_def *cache, const char *name, int len, int prefix_len) |
15438d5a | 265 | { |
684dd4c2 MT |
266 | /* |
267 | * Note: this function is used by the checkout machinery, which also | |
268 | * takes care to properly reset the cache when it performs an operation | |
269 | * that would leave the cache outdated. If this function starts caching | |
270 | * anything else besides FL_DIR, remember to also invalidate the cache | |
271 | * when creating or deleting paths that might be in the cache. | |
272 | */ | |
867f72bf | 273 | return lstat_cache(cache, name, len, |
bad4a54f KB |
274 | FL_DIR|FL_FULLPATH, prefix_len) & |
275 | FL_DIR; | |
276 | } | |
78478927 | 277 | |
e7c73053 | 278 | static struct strbuf removal = STRBUF_INIT; |
78478927 KB |
279 | |
280 | static void do_remove_scheduled_dirs(int new_len) | |
281 | { | |
282 | while (removal.len > new_len) { | |
e7c73053 | 283 | removal.buf[removal.len] = '\0'; |
00fcce28 EN |
284 | if ((startup_info->original_cwd && |
285 | !strcmp(removal.buf, startup_info->original_cwd)) || | |
286 | rmdir(removal.buf)) | |
78478927 KB |
287 | break; |
288 | do { | |
289 | removal.len--; | |
290 | } while (removal.len > new_len && | |
e7c73053 | 291 | removal.buf[removal.len] != '/'); |
78478927 KB |
292 | } |
293 | removal.len = new_len; | |
78478927 KB |
294 | } |
295 | ||
296 | void schedule_dir_for_removal(const char *name, int len) | |
297 | { | |
298 | int match_len, last_slash, i, previous_slash; | |
299 | ||
00fcce28 EN |
300 | if (startup_info->original_cwd && |
301 | !strcmp(name, startup_info->original_cwd)) | |
302 | return; /* Do not remove the current working directory */ | |
303 | ||
78478927 | 304 | match_len = last_slash = i = |
e7c73053 | 305 | longest_path_match(name, len, removal.buf, removal.len, |
78478927 KB |
306 | &previous_slash); |
307 | /* Find last slash inside 'name' */ | |
308 | while (i < len) { | |
309 | if (name[i] == '/') | |
310 | last_slash = i; | |
311 | i++; | |
312 | } | |
313 | ||
314 | /* | |
315 | * If we are about to go down the directory tree, we check if | |
316 | * we must first go upwards the tree, such that we then can | |
317 | * remove possible empty directories as we go upwards. | |
318 | */ | |
319 | if (match_len < last_slash && match_len < removal.len) | |
320 | do_remove_scheduled_dirs(match_len); | |
321 | /* | |
322 | * If we go deeper down the directory tree, we only need to | |
323 | * save the new path components as we go down. | |
324 | */ | |
e7c73053 KB |
325 | if (match_len < last_slash) |
326 | strbuf_add(&removal, &name[match_len], last_slash - match_len); | |
78478927 KB |
327 | } |
328 | ||
329 | void remove_scheduled_dirs(void) | |
330 | { | |
331 | do_remove_scheduled_dirs(0); | |
78478927 | 332 | } |
684dd4c2 MT |
333 | |
334 | void invalidate_lstat_cache(void) | |
335 | { | |
336 | reset_lstat_cache(&default_cache); | |
337 | } | |
338 | ||
339 | #undef rmdir | |
340 | int lstat_cache_aware_rmdir(const char *path) | |
341 | { | |
342 | /* Any change in this function must be made also in `mingw_rmdir()` */ | |
343 | int ret = rmdir(path); | |
344 | ||
345 | if (!ret) | |
346 | invalidate_lstat_cache(); | |
347 | ||
348 | return ret; | |
349 | } |