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Commit | Line | Data |
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12dccc16 | 1 | #include "cache.h" |
8e440259 | 2 | #include "blob.h" |
8ca12c0d | 3 | #include "dir.h" |
dd8e9121 | 4 | #include "streaming.h" |
12dccc16 | 5 | |
81a9aa60 KB |
6 | static void create_directories(const char *path, int path_len, |
7 | const struct checkout *state) | |
12dccc16 | 8 | { |
81a9aa60 KB |
9 | char *buf = xmalloc(path_len + 1); |
10 | int len = 0; | |
11 | ||
12 | while (len < path_len) { | |
13 | do { | |
14 | buf[len] = path[len]; | |
15 | len++; | |
16 | } while (len < path_len && path[len] != '/'); | |
17 | if (len >= path_len) | |
18 | break; | |
12dccc16 | 19 | buf[len] = 0; |
fa2e71c9 | 20 | |
bad4a54f KB |
21 | /* |
22 | * For 'checkout-index --prefix=<dir>', <dir> is | |
23 | * allowed to be a symlink to an existing directory, | |
24 | * and we set 'state->base_dir_len' below, such that | |
25 | * we test the path components of the prefix with the | |
26 | * stat() function instead of the lstat() function. | |
27 | */ | |
57199892 | 28 | if (has_dirs_only_path(buf, len, state->base_dir_len)) |
fa2e71c9 JH |
29 | continue; /* ok, it is already a directory. */ |
30 | ||
31 | /* | |
bad4a54f KB |
32 | * If this mkdir() would fail, it could be that there |
33 | * is already a symlink or something else exists | |
34 | * there, therefore we then try to unlink it and try | |
35 | * one more time to create the directory. | |
fa2e71c9 | 36 | */ |
f312de01 | 37 | if (mkdir(buf, 0777)) { |
fa2e71c9 | 38 | if (errno == EEXIST && state->force && |
691f1a28 | 39 | !unlink_or_warn(buf) && !mkdir(buf, 0777)) |
fa2e71c9 | 40 | continue; |
0721c314 | 41 | die_errno("cannot create directory at '%s'", buf); |
12dccc16 LT |
42 | } |
43 | } | |
44 | free(buf); | |
45 | } | |
46 | ||
47 | static void remove_subtree(const char *path) | |
48 | { | |
49 | DIR *dir = opendir(path); | |
50 | struct dirent *de; | |
51 | char pathbuf[PATH_MAX]; | |
52 | char *name; | |
a6080a0a | 53 | |
12dccc16 | 54 | if (!dir) |
d824cbba | 55 | die_errno("cannot opendir '%s'", path); |
12dccc16 LT |
56 | strcpy(pathbuf, path); |
57 | name = pathbuf + strlen(path); | |
58 | *name++ = '/'; | |
59 | while ((de = readdir(dir)) != NULL) { | |
60 | struct stat st; | |
8ca12c0d | 61 | if (is_dot_or_dotdot(de->d_name)) |
12dccc16 LT |
62 | continue; |
63 | strcpy(name, de->d_name); | |
64 | if (lstat(pathbuf, &st)) | |
d824cbba | 65 | die_errno("cannot lstat '%s'", pathbuf); |
12dccc16 LT |
66 | if (S_ISDIR(st.st_mode)) |
67 | remove_subtree(pathbuf); | |
68 | else if (unlink(pathbuf)) | |
d824cbba | 69 | die_errno("cannot unlink '%s'", pathbuf); |
12dccc16 LT |
70 | } |
71 | closedir(dir); | |
72 | if (rmdir(path)) | |
d824cbba | 73 | die_errno("cannot rmdir '%s'", path); |
12dccc16 LT |
74 | } |
75 | ||
d48a72f3 | 76 | static int create_file(const char *path, unsigned int mode) |
12dccc16 | 77 | { |
12dccc16 | 78 | mode = (mode & 0100) ? 0777 : 0666; |
781411ed | 79 | return open(path, O_WRONLY | O_CREAT | O_EXCL, mode); |
12dccc16 LT |
80 | } |
81 | ||
4857c761 | 82 | static void *read_blob_entry(struct cache_entry *ce, unsigned long *size) |
f0807e62 LT |
83 | { |
84 | enum object_type type; | |
85 | void *new = read_sha1_file(ce->sha1, &type, size); | |
86 | ||
87 | if (new) { | |
88 | if (type == OBJ_BLOB) | |
89 | return new; | |
90 | free(new); | |
91 | } | |
92 | return NULL; | |
93 | } | |
94 | ||
fd5db55d JH |
95 | static int open_output_fd(char *path, struct cache_entry *ce, int to_tempfile) |
96 | { | |
97 | int symlink = (ce->ce_mode & S_IFMT) != S_IFREG; | |
98 | if (to_tempfile) { | |
99 | strcpy(path, symlink | |
100 | ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX"); | |
101 | return mkstemp(path); | |
102 | } else { | |
103 | return create_file(path, !symlink ? ce->ce_mode : 0666); | |
104 | } | |
105 | } | |
106 | ||
107 | static int fstat_output(int fd, const struct checkout *state, struct stat *st) | |
108 | { | |
109 | /* use fstat() only when path == ce->name */ | |
110 | if (fstat_is_reliable() && | |
111 | state->refresh_cache && !state->base_dir_len) { | |
112 | fstat(fd, st); | |
113 | return 1; | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | ||
dd8e9121 JH |
118 | static int streaming_write_entry(struct cache_entry *ce, char *path, |
119 | const struct checkout *state, int to_tempfile, | |
120 | int *fstat_done, struct stat *statbuf) | |
121 | { | |
122 | struct git_istream *st; | |
123 | enum object_type type; | |
124 | unsigned long sz; | |
125 | int result = -1; | |
de6182db | 126 | ssize_t kept = 0; |
dd8e9121 JH |
127 | int fd = -1; |
128 | ||
129 | st = open_istream(ce->sha1, &type, &sz); | |
130 | if (!st) | |
131 | return -1; | |
132 | if (type != OBJ_BLOB) | |
133 | goto close_and_exit; | |
134 | ||
135 | fd = open_output_fd(path, ce, to_tempfile); | |
136 | if (fd < 0) | |
137 | goto close_and_exit; | |
138 | ||
139 | for (;;) { | |
de6182db JH |
140 | char buf[1024 * 16]; |
141 | ssize_t wrote, holeto; | |
dd8e9121 JH |
142 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); |
143 | ||
144 | if (!readlen) | |
145 | break; | |
de6182db JH |
146 | if (sizeof(buf) == readlen) { |
147 | for (holeto = 0; holeto < readlen; holeto++) | |
148 | if (buf[holeto]) | |
149 | break; | |
150 | if (readlen == holeto) { | |
151 | kept += holeto; | |
152 | continue; | |
153 | } | |
154 | } | |
dd8e9121 | 155 | |
de6182db JH |
156 | if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1) |
157 | goto close_and_exit; | |
158 | else | |
159 | kept = 0; | |
dd8e9121 JH |
160 | wrote = write_in_full(fd, buf, readlen); |
161 | ||
162 | if (wrote != readlen) | |
163 | goto close_and_exit; | |
164 | } | |
de6182db JH |
165 | if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 || |
166 | write(fd, "", 1) != 1)) | |
167 | goto close_and_exit; | |
dd8e9121 JH |
168 | *fstat_done = fstat_output(fd, state, statbuf); |
169 | ||
170 | close_and_exit: | |
171 | close_istream(st); | |
172 | if (0 <= fd) | |
173 | result = close(fd); | |
174 | if (result && 0 <= fd) | |
175 | unlink(path); | |
176 | return result; | |
177 | } | |
178 | ||
efbc5831 | 179 | static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile) |
12dccc16 | 180 | { |
4857c761 | 181 | unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT; |
e4c72923 | 182 | int fd, ret, fstat_done = 0; |
4857c761 KB |
183 | char *new; |
184 | struct strbuf buf = STRBUF_INIT; | |
185 | unsigned long size; | |
186 | size_t wrote, newsize = 0; | |
e4c72923 | 187 | struct stat st; |
4857c761 | 188 | |
dd8e9121 JH |
189 | if ((ce_mode_s_ifmt == S_IFREG) && |
190 | can_bypass_conversion(path) && | |
191 | !streaming_write_entry(ce, path, state, to_tempfile, | |
192 | &fstat_done, &st)) | |
193 | goto finish; | |
194 | ||
4857c761 | 195 | switch (ce_mode_s_ifmt) { |
12dccc16 | 196 | case S_IFREG: |
4857c761 KB |
197 | case S_IFLNK: |
198 | new = read_blob_entry(ce, &size); | |
f0807e62 | 199 | if (!new) |
d43e9073 | 200 | return error("unable to read sha1 file of %s (%s)", |
f0807e62 | 201 | path, sha1_to_hex(ce->sha1)); |
1a9d7e9b | 202 | |
4857c761 KB |
203 | if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) { |
204 | ret = symlink(new, path); | |
205 | free(new); | |
206 | if (ret) | |
d43e9073 | 207 | return error("unable to create symlink %s (%s)", |
4857c761 KB |
208 | path, strerror(errno)); |
209 | break; | |
210 | } | |
211 | ||
1a9d7e9b JH |
212 | /* |
213 | * Convert from git internal format to working tree format | |
214 | */ | |
4857c761 KB |
215 | if (ce_mode_s_ifmt == S_IFREG && |
216 | convert_to_working_tree(ce->name, new, size, &buf)) { | |
1a9d7e9b | 217 | free(new); |
c32f749f RS |
218 | new = strbuf_detach(&buf, &newsize); |
219 | size = newsize; | |
1a9d7e9b JH |
220 | } |
221 | ||
fd5db55d | 222 | fd = open_output_fd(path, ce, to_tempfile); |
12dccc16 LT |
223 | if (fd < 0) { |
224 | free(new); | |
d43e9073 | 225 | return error("unable to create file %s (%s)", |
12dccc16 LT |
226 | path, strerror(errno)); |
227 | } | |
6c510bee | 228 | |
93822c22 | 229 | wrote = write_in_full(fd, new, size); |
fd5db55d JH |
230 | if (!to_tempfile) |
231 | fstat_done = fstat_output(fd, state, &st); | |
12dccc16 LT |
232 | close(fd); |
233 | free(new); | |
234 | if (wrote != size) | |
d43e9073 | 235 | return error("unable to write file %s", path); |
12dccc16 | 236 | break; |
302b9282 | 237 | case S_IFGITLINK: |
f0807e62 | 238 | if (to_tempfile) |
d43e9073 | 239 | return error("cannot create temporary subproject %s", path); |
f0807e62 | 240 | if (mkdir(path, 0777) < 0) |
d43e9073 | 241 | return error("cannot create subproject directory %s", path); |
f0807e62 | 242 | break; |
12dccc16 | 243 | default: |
d43e9073 | 244 | return error("unknown file mode for %s in index", path); |
12dccc16 LT |
245 | } |
246 | ||
dd8e9121 | 247 | finish: |
6ee67f26 | 248 | if (state->refresh_cache) { |
e4c72923 KB |
249 | if (!fstat_done) |
250 | lstat(ce->name, &st); | |
12dccc16 LT |
251 | fill_stat_cache_info(ce, &st); |
252 | } | |
253 | return 0; | |
254 | } | |
255 | ||
b6986d8a LT |
256 | /* |
257 | * This is like 'lstat()', except it refuses to follow symlinks | |
da02ca50 | 258 | * in the path, after skipping "skiplen". |
b6986d8a | 259 | */ |
61b97df7 | 260 | static int check_path(const char *path, int len, struct stat *st, int skiplen) |
b6986d8a | 261 | { |
da02ca50 JH |
262 | const char *slash = path + len; |
263 | ||
264 | while (path < slash && *slash != '/') | |
265 | slash--; | |
266 | if (!has_dirs_only_path(path, slash - path, skiplen)) { | |
b6986d8a LT |
267 | errno = ENOENT; |
268 | return -1; | |
269 | } | |
270 | return lstat(path, st); | |
271 | } | |
272 | ||
efbc5831 | 273 | int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath) |
12dccc16 | 274 | { |
095c424d | 275 | static char path[PATH_MAX + 1]; |
de84f99c | 276 | struct stat st; |
12dccc16 LT |
277 | int len = state->base_dir_len; |
278 | ||
de84f99c SP |
279 | if (topath) |
280 | return write_entry(ce, topath, state, 1); | |
281 | ||
12dccc16 LT |
282 | memcpy(path, state->base_dir, len); |
283 | strcpy(path + len, ce->name); | |
81a9aa60 | 284 | len += ce_namelen(ce); |
12dccc16 | 285 | |
da02ca50 | 286 | if (!check_path(path, len, &st, state->base_dir_len)) { |
56cac48c | 287 | unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); |
12dccc16 LT |
288 | if (!changed) |
289 | return 0; | |
290 | if (!state->force) { | |
291 | if (!state->quiet) | |
d43e9073 | 292 | fprintf(stderr, "%s already exists, no checkout\n", path); |
4b12dae6 | 293 | return -1; |
12dccc16 LT |
294 | } |
295 | ||
296 | /* | |
297 | * We unlink the old file, to get the new one with the | |
298 | * right permissions (including umask, which is nasty | |
299 | * to emulate by hand - much easier to let the system | |
300 | * just do the right thing) | |
301 | */ | |
d48a72f3 | 302 | if (S_ISDIR(st.st_mode)) { |
f0807e62 | 303 | /* If it is a gitlink, leave it alone! */ |
7a51ed66 | 304 | if (S_ISGITLINK(ce->ce_mode)) |
f0807e62 | 305 | return 0; |
d48a72f3 LT |
306 | if (!state->force) |
307 | return error("%s is a directory", path); | |
308 | remove_subtree(path); | |
971f229c LT |
309 | } else if (unlink(path)) |
310 | return error("unable to unlink old '%s' (%s)", path, strerror(errno)); | |
de84f99c | 311 | } else if (state->not_new) |
12dccc16 | 312 | return 0; |
81a9aa60 | 313 | create_directories(path, len, state); |
de84f99c | 314 | return write_entry(ce, path, state, 0); |
12dccc16 | 315 | } |