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1 | #include "cache.h" | |
2 | #include "blob.h" | |
3 | #include "dir.h" | |
4 | ||
5 | static void create_directories(const char *path, int path_len, | |
6 | const struct checkout *state) | |
7 | { | |
8 | char *buf = xmalloc(path_len + 1); | |
9 | int len = 0; | |
10 | ||
11 | while (len < path_len) { | |
12 | do { | |
13 | buf[len] = path[len]; | |
14 | len++; | |
15 | } while (len < path_len && path[len] != '/'); | |
16 | if (len >= path_len) | |
17 | break; | |
18 | buf[len] = 0; | |
19 | ||
20 | /* | |
21 | * For 'checkout-index --prefix=<dir>', <dir> is | |
22 | * allowed to be a symlink to an existing directory, | |
23 | * and we set 'state->base_dir_len' below, such that | |
24 | * we test the path components of the prefix with the | |
25 | * stat() function instead of the lstat() function. | |
26 | */ | |
27 | if (has_dirs_only_path(buf, len, state->base_dir_len)) | |
28 | continue; /* ok, it is already a directory. */ | |
29 | ||
30 | /* | |
31 | * If this mkdir() would fail, it could be that there | |
32 | * is already a symlink or something else exists | |
33 | * there, therefore we then try to unlink it and try | |
34 | * one more time to create the directory. | |
35 | */ | |
36 | if (mkdir(buf, 0777)) { | |
37 | if (errno == EEXIST && state->force && | |
38 | !unlink_or_warn(buf) && !mkdir(buf, 0777)) | |
39 | continue; | |
40 | die_errno("cannot create directory at '%s'", buf); | |
41 | } | |
42 | } | |
43 | free(buf); | |
44 | } | |
45 | ||
46 | static void remove_subtree(const char *path) | |
47 | { | |
48 | DIR *dir = opendir(path); | |
49 | struct dirent *de; | |
50 | char pathbuf[PATH_MAX]; | |
51 | char *name; | |
52 | ||
53 | if (!dir) | |
54 | die_errno("cannot opendir '%s'", path); | |
55 | strcpy(pathbuf, path); | |
56 | name = pathbuf + strlen(path); | |
57 | *name++ = '/'; | |
58 | while ((de = readdir(dir)) != NULL) { | |
59 | struct stat st; | |
60 | if (is_dot_or_dotdot(de->d_name)) | |
61 | continue; | |
62 | strcpy(name, de->d_name); | |
63 | if (lstat(pathbuf, &st)) | |
64 | die_errno("cannot lstat '%s'", pathbuf); | |
65 | if (S_ISDIR(st.st_mode)) | |
66 | remove_subtree(pathbuf); | |
67 | else if (unlink(pathbuf)) | |
68 | die_errno("cannot unlink '%s'", pathbuf); | |
69 | } | |
70 | closedir(dir); | |
71 | if (rmdir(path)) | |
72 | die_errno("cannot rmdir '%s'", path); | |
73 | } | |
74 | ||
75 | static int create_file(const char *path, unsigned int mode) | |
76 | { | |
77 | mode = (mode & 0100) ? 0777 : 0666; | |
78 | return open(path, O_WRONLY | O_CREAT | O_EXCL, mode); | |
79 | } | |
80 | ||
81 | static void *read_blob_entry(struct cache_entry *ce, unsigned long *size) | |
82 | { | |
83 | enum object_type type; | |
84 | void *new = read_sha1_file(ce->sha1, &type, size); | |
85 | ||
86 | if (new) { | |
87 | if (type == OBJ_BLOB) | |
88 | return new; | |
89 | free(new); | |
90 | } | |
91 | return NULL; | |
92 | } | |
93 | ||
94 | static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile) | |
95 | { | |
96 | unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT; | |
97 | int fd, ret, fstat_done = 0; | |
98 | char *new; | |
99 | struct strbuf buf = STRBUF_INIT; | |
100 | unsigned long size; | |
101 | size_t wrote, newsize = 0; | |
102 | struct stat st; | |
103 | ||
104 | switch (ce_mode_s_ifmt) { | |
105 | case S_IFREG: | |
106 | case S_IFLNK: | |
107 | new = read_blob_entry(ce, &size); | |
108 | if (!new) | |
109 | return error("git checkout-index: unable to read sha1 file of %s (%s)", | |
110 | path, sha1_to_hex(ce->sha1)); | |
111 | ||
112 | if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) { | |
113 | ret = symlink(new, path); | |
114 | free(new); | |
115 | if (ret) | |
116 | return error("git checkout-index: unable to create symlink %s (%s)", | |
117 | path, strerror(errno)); | |
118 | break; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Convert from git internal format to working tree format | |
123 | */ | |
124 | if (ce_mode_s_ifmt == S_IFREG && | |
125 | convert_to_working_tree(ce->name, new, size, &buf)) { | |
126 | free(new); | |
127 | new = strbuf_detach(&buf, &newsize); | |
128 | size = newsize; | |
129 | } | |
130 | ||
131 | if (to_tempfile) { | |
132 | if (ce_mode_s_ifmt == S_IFREG) | |
133 | strcpy(path, ".merge_file_XXXXXX"); | |
134 | else | |
135 | strcpy(path, ".merge_link_XXXXXX"); | |
136 | fd = mkstemp(path); | |
137 | } else if (ce_mode_s_ifmt == S_IFREG) { | |
138 | fd = create_file(path, ce->ce_mode); | |
139 | } else { | |
140 | fd = create_file(path, 0666); | |
141 | } | |
142 | if (fd < 0) { | |
143 | free(new); | |
144 | return error("git checkout-index: unable to create file %s (%s)", | |
145 | path, strerror(errno)); | |
146 | } | |
147 | ||
148 | wrote = write_in_full(fd, new, size); | |
149 | /* use fstat() only when path == ce->name */ | |
150 | if (fstat_is_reliable() && | |
151 | state->refresh_cache && !to_tempfile && !state->base_dir_len) { | |
152 | fstat(fd, &st); | |
153 | fstat_done = 1; | |
154 | } | |
155 | close(fd); | |
156 | free(new); | |
157 | if (wrote != size) | |
158 | return error("git checkout-index: unable to write file %s", path); | |
159 | break; | |
160 | case S_IFGITLINK: | |
161 | if (to_tempfile) | |
162 | return error("git checkout-index: cannot create temporary subproject %s", path); | |
163 | if (mkdir(path, 0777) < 0) | |
164 | return error("git checkout-index: cannot create subproject directory %s", path); | |
165 | break; | |
166 | default: | |
167 | return error("git checkout-index: unknown file mode for %s", path); | |
168 | } | |
169 | ||
170 | if (state->refresh_cache) { | |
171 | if (!fstat_done) | |
172 | lstat(ce->name, &st); | |
173 | fill_stat_cache_info(ce, &st); | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /* | |
179 | * This is like 'lstat()', except it refuses to follow symlinks | |
180 | * in the path, after skipping "skiplen". | |
181 | */ | |
182 | static int check_path(const char *path, int len, struct stat *st, int skiplen) | |
183 | { | |
184 | const char *slash = path + len; | |
185 | ||
186 | while (path < slash && *slash != '/') | |
187 | slash--; | |
188 | if (!has_dirs_only_path(path, slash - path, skiplen)) { | |
189 | errno = ENOENT; | |
190 | return -1; | |
191 | } | |
192 | return lstat(path, st); | |
193 | } | |
194 | ||
195 | int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath) | |
196 | { | |
197 | static char path[PATH_MAX + 1]; | |
198 | struct stat st; | |
199 | int len = state->base_dir_len; | |
200 | ||
201 | if (topath) | |
202 | return write_entry(ce, topath, state, 1); | |
203 | ||
204 | memcpy(path, state->base_dir, len); | |
205 | strcpy(path + len, ce->name); | |
206 | len += ce_namelen(ce); | |
207 | ||
208 | if (!check_path(path, len, &st, state->base_dir_len)) { | |
209 | unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); | |
210 | if (!changed) | |
211 | return 0; | |
212 | if (!state->force) { | |
213 | if (!state->quiet) | |
214 | fprintf(stderr, "git-checkout-index: %s already exists\n", path); | |
215 | return -1; | |
216 | } | |
217 | ||
218 | /* | |
219 | * We unlink the old file, to get the new one with the | |
220 | * right permissions (including umask, which is nasty | |
221 | * to emulate by hand - much easier to let the system | |
222 | * just do the right thing) | |
223 | */ | |
224 | if (S_ISDIR(st.st_mode)) { | |
225 | /* If it is a gitlink, leave it alone! */ | |
226 | if (S_ISGITLINK(ce->ce_mode)) | |
227 | return 0; | |
228 | if (!state->force) | |
229 | return error("%s is a directory", path); | |
230 | remove_subtree(path); | |
231 | } else if (unlink(path)) | |
232 | return error("unable to unlink old '%s' (%s)", path, strerror(errno)); | |
233 | } else if (state->not_new) | |
234 | return 0; | |
235 | create_directories(path, len, state); | |
236 | return write_entry(ce, path, state, 0); | |
237 | } |