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1 | #include "cache.h" | |
2 | #include "blob.h" | |
3 | #include "dir.h" | |
4 | #include "streaming.h" | |
5 | ||
6 | static void create_directories(const char *path, int path_len, | |
7 | const struct checkout *state) | |
8 | { | |
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; | |
19 | buf[len] = 0; | |
20 | ||
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 | */ | |
28 | if (has_dirs_only_path(buf, len, state->base_dir_len)) | |
29 | continue; /* ok, it is already a directory. */ | |
30 | ||
31 | /* | |
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. | |
36 | */ | |
37 | if (mkdir(buf, 0777)) { | |
38 | if (errno == EEXIST && state->force && | |
39 | !unlink_or_warn(buf) && !mkdir(buf, 0777)) | |
40 | continue; | |
41 | die_errno("cannot create directory at '%s'", buf); | |
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; | |
53 | ||
54 | if (!dir) | |
55 | die_errno("cannot opendir '%s'", path); | |
56 | strcpy(pathbuf, path); | |
57 | name = pathbuf + strlen(path); | |
58 | *name++ = '/'; | |
59 | while ((de = readdir(dir)) != NULL) { | |
60 | struct stat st; | |
61 | if (is_dot_or_dotdot(de->d_name)) | |
62 | continue; | |
63 | strcpy(name, de->d_name); | |
64 | if (lstat(pathbuf, &st)) | |
65 | die_errno("cannot lstat '%s'", pathbuf); | |
66 | if (S_ISDIR(st.st_mode)) | |
67 | remove_subtree(pathbuf); | |
68 | else if (unlink(pathbuf)) | |
69 | die_errno("cannot unlink '%s'", pathbuf); | |
70 | } | |
71 | closedir(dir); | |
72 | if (rmdir(path)) | |
73 | die_errno("cannot rmdir '%s'", path); | |
74 | } | |
75 | ||
76 | static int create_file(const char *path, unsigned int mode) | |
77 | { | |
78 | mode = (mode & 0100) ? 0777 : 0666; | |
79 | return open(path, O_WRONLY | O_CREAT | O_EXCL, mode); | |
80 | } | |
81 | ||
82 | static void *read_blob_entry(struct cache_entry *ce, unsigned long *size) | |
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 | ||
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 | ||
118 | static int streaming_write_entry(struct cache_entry *ce, char *path, | |
119 | struct stream_filter *filter, | |
120 | const struct checkout *state, int to_tempfile, | |
121 | int *fstat_done, struct stat *statbuf) | |
122 | { | |
123 | struct git_istream *st; | |
124 | enum object_type type; | |
125 | unsigned long sz; | |
126 | int result = -1; | |
127 | ssize_t kept = 0; | |
128 | int fd = -1; | |
129 | ||
130 | st = open_istream(ce->sha1, &type, &sz, filter); | |
131 | if (!st) | |
132 | return -1; | |
133 | if (type != OBJ_BLOB) | |
134 | goto close_and_exit; | |
135 | ||
136 | fd = open_output_fd(path, ce, to_tempfile); | |
137 | if (fd < 0) | |
138 | goto close_and_exit; | |
139 | ||
140 | for (;;) { | |
141 | char buf[1024 * 16]; | |
142 | ssize_t wrote, holeto; | |
143 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
144 | ||
145 | if (!readlen) | |
146 | break; | |
147 | if (sizeof(buf) == readlen) { | |
148 | for (holeto = 0; holeto < readlen; holeto++) | |
149 | if (buf[holeto]) | |
150 | break; | |
151 | if (readlen == holeto) { | |
152 | kept += holeto; | |
153 | continue; | |
154 | } | |
155 | } | |
156 | ||
157 | if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1) | |
158 | goto close_and_exit; | |
159 | else | |
160 | kept = 0; | |
161 | wrote = write_in_full(fd, buf, readlen); | |
162 | ||
163 | if (wrote != readlen) | |
164 | goto close_and_exit; | |
165 | } | |
166 | if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 || | |
167 | write(fd, "", 1) != 1)) | |
168 | goto close_and_exit; | |
169 | *fstat_done = fstat_output(fd, state, statbuf); | |
170 | ||
171 | close_and_exit: | |
172 | close_istream(st); | |
173 | if (0 <= fd) | |
174 | result = close(fd); | |
175 | if (result && 0 <= fd) | |
176 | unlink(path); | |
177 | return result; | |
178 | } | |
179 | ||
180 | static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile) | |
181 | { | |
182 | unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT; | |
183 | int fd, ret, fstat_done = 0; | |
184 | char *new; | |
185 | struct strbuf buf = STRBUF_INIT; | |
186 | unsigned long size; | |
187 | size_t wrote, newsize = 0; | |
188 | struct stat st; | |
189 | ||
190 | if (ce_mode_s_ifmt == S_IFREG) { | |
191 | struct stream_filter *filter = get_stream_filter(path, ce->sha1); | |
192 | if (filter && | |
193 | !streaming_write_entry(ce, path, filter, | |
194 | state, to_tempfile, | |
195 | &fstat_done, &st)) | |
196 | goto finish; | |
197 | } | |
198 | ||
199 | switch (ce_mode_s_ifmt) { | |
200 | case S_IFREG: | |
201 | case S_IFLNK: | |
202 | new = read_blob_entry(ce, &size); | |
203 | if (!new) | |
204 | return error("unable to read sha1 file of %s (%s)", | |
205 | path, sha1_to_hex(ce->sha1)); | |
206 | ||
207 | if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) { | |
208 | ret = symlink(new, path); | |
209 | free(new); | |
210 | if (ret) | |
211 | return error("unable to create symlink %s (%s)", | |
212 | path, strerror(errno)); | |
213 | break; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Convert from git internal format to working tree format | |
218 | */ | |
219 | if (ce_mode_s_ifmt == S_IFREG && | |
220 | convert_to_working_tree(ce->name, new, size, &buf)) { | |
221 | free(new); | |
222 | new = strbuf_detach(&buf, &newsize); | |
223 | size = newsize; | |
224 | } | |
225 | ||
226 | fd = open_output_fd(path, ce, to_tempfile); | |
227 | if (fd < 0) { | |
228 | free(new); | |
229 | return error("unable to create file %s (%s)", | |
230 | path, strerror(errno)); | |
231 | } | |
232 | ||
233 | wrote = write_in_full(fd, new, size); | |
234 | if (!to_tempfile) | |
235 | fstat_done = fstat_output(fd, state, &st); | |
236 | close(fd); | |
237 | free(new); | |
238 | if (wrote != size) | |
239 | return error("unable to write file %s", path); | |
240 | break; | |
241 | case S_IFGITLINK: | |
242 | if (to_tempfile) | |
243 | return error("cannot create temporary subproject %s", path); | |
244 | if (mkdir(path, 0777) < 0) | |
245 | return error("cannot create subproject directory %s", path); | |
246 | break; | |
247 | default: | |
248 | return error("unknown file mode for %s in index", path); | |
249 | } | |
250 | ||
251 | finish: | |
252 | if (state->refresh_cache) { | |
253 | if (!fstat_done) | |
254 | lstat(ce->name, &st); | |
255 | fill_stat_cache_info(ce, &st); | |
256 | } | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* | |
261 | * This is like 'lstat()', except it refuses to follow symlinks | |
262 | * in the path, after skipping "skiplen". | |
263 | */ | |
264 | static int check_path(const char *path, int len, struct stat *st, int skiplen) | |
265 | { | |
266 | const char *slash = path + len; | |
267 | ||
268 | while (path < slash && *slash != '/') | |
269 | slash--; | |
270 | if (!has_dirs_only_path(path, slash - path, skiplen)) { | |
271 | errno = ENOENT; | |
272 | return -1; | |
273 | } | |
274 | return lstat(path, st); | |
275 | } | |
276 | ||
277 | int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath) | |
278 | { | |
279 | static char path[PATH_MAX + 1]; | |
280 | struct stat st; | |
281 | int len = state->base_dir_len; | |
282 | ||
283 | if (topath) | |
284 | return write_entry(ce, topath, state, 1); | |
285 | ||
286 | memcpy(path, state->base_dir, len); | |
287 | strcpy(path + len, ce->name); | |
288 | len += ce_namelen(ce); | |
289 | ||
290 | if (!check_path(path, len, &st, state->base_dir_len)) { | |
291 | unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); | |
292 | if (!changed) | |
293 | return 0; | |
294 | if (!state->force) { | |
295 | if (!state->quiet) | |
296 | fprintf(stderr, "%s already exists, no checkout\n", path); | |
297 | return -1; | |
298 | } | |
299 | ||
300 | /* | |
301 | * We unlink the old file, to get the new one with the | |
302 | * right permissions (including umask, which is nasty | |
303 | * to emulate by hand - much easier to let the system | |
304 | * just do the right thing) | |
305 | */ | |
306 | if (S_ISDIR(st.st_mode)) { | |
307 | /* If it is a gitlink, leave it alone! */ | |
308 | if (S_ISGITLINK(ce->ce_mode)) | |
309 | return 0; | |
310 | if (!state->force) | |
311 | return error("%s is a directory", path); | |
312 | remove_subtree(path); | |
313 | } else if (unlink(path)) | |
314 | return error("unable to unlink old '%s' (%s)", path, strerror(errno)); | |
315 | } else if (state->not_new) | |
316 | return 0; | |
317 | create_directories(path, len, state); | |
318 | return write_entry(ce, path, state, 0); | |
319 | } |