Merge branch 'esr/maint-doc-fast-import'
[git.git] / entry.c
blob17a6bccec64e0e523aacc124611c43bd818372e3
1 #include "cache.h"
2 #include "blob.h"
3 #include "dir.h"
4 #include "streaming.h"
6 static void create_directories(const char *path, int path_len,
7 const struct checkout *state)
9 char *buf = xmalloc(path_len + 1);
10 int len = 0;
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;
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.
28 if (has_dirs_only_path(buf, len, state->base_dir_len))
29 continue; /* ok, it is already a directory. */
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.
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);
44 free(buf);
47 static void remove_subtree(const char *path)
49 DIR *dir = opendir(path);
50 struct dirent *de;
51 char pathbuf[PATH_MAX];
52 char *name;
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);
71 closedir(dir);
72 if (rmdir(path))
73 die_errno("cannot rmdir '%s'", path);
76 static int create_file(const char *path, unsigned int mode)
78 mode = (mode & 0100) ? 0777 : 0666;
79 return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
82 static void *read_blob_entry(struct cache_entry *ce, unsigned long *size)
84 enum object_type type;
85 void *new = read_sha1_file(ce->sha1, &type, size);
87 if (new) {
88 if (type == OBJ_BLOB)
89 return new;
90 free(new);
92 return NULL;
95 static int open_output_fd(char *path, struct cache_entry *ce, int to_tempfile)
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);
107 static int fstat_output(int fd, const struct checkout *state, struct stat *st)
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;
115 return 0;
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)
123 int result = -1;
124 int fd;
126 fd = open_output_fd(path, ce, to_tempfile);
127 if (0 <= fd) {
128 result = stream_blob_to_fd(fd, ce->sha1, filter, 1);
129 *fstat_done = fstat_output(fd, state, statbuf);
130 result = close(fd);
132 if (result && 0 <= fd)
133 unlink(path);
134 return result;
137 static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
139 unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
140 int fd, ret, fstat_done = 0;
141 char *new;
142 struct strbuf buf = STRBUF_INIT;
143 unsigned long size;
144 size_t wrote, newsize = 0;
145 struct stat st;
147 if (ce_mode_s_ifmt == S_IFREG) {
148 struct stream_filter *filter = get_stream_filter(path, ce->sha1);
149 if (filter &&
150 !streaming_write_entry(ce, path, filter,
151 state, to_tempfile,
152 &fstat_done, &st))
153 goto finish;
156 switch (ce_mode_s_ifmt) {
157 case S_IFREG:
158 case S_IFLNK:
159 new = read_blob_entry(ce, &size);
160 if (!new)
161 return error("unable to read sha1 file of %s (%s)",
162 path, sha1_to_hex(ce->sha1));
164 if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
165 ret = symlink(new, path);
166 free(new);
167 if (ret)
168 return error("unable to create symlink %s (%s)",
169 path, strerror(errno));
170 break;
174 * Convert from git internal format to working tree format
176 if (ce_mode_s_ifmt == S_IFREG &&
177 convert_to_working_tree(ce->name, new, size, &buf)) {
178 free(new);
179 new = strbuf_detach(&buf, &newsize);
180 size = newsize;
183 fd = open_output_fd(path, ce, to_tempfile);
184 if (fd < 0) {
185 free(new);
186 return error("unable to create file %s (%s)",
187 path, strerror(errno));
190 wrote = write_in_full(fd, new, size);
191 if (!to_tempfile)
192 fstat_done = fstat_output(fd, state, &st);
193 close(fd);
194 free(new);
195 if (wrote != size)
196 return error("unable to write file %s", path);
197 break;
198 case S_IFGITLINK:
199 if (to_tempfile)
200 return error("cannot create temporary subproject %s", path);
201 if (mkdir(path, 0777) < 0)
202 return error("cannot create subproject directory %s", path);
203 break;
204 default:
205 return error("unknown file mode for %s in index", path);
208 finish:
209 if (state->refresh_cache) {
210 if (!fstat_done)
211 lstat(ce->name, &st);
212 fill_stat_cache_info(ce, &st);
214 return 0;
218 * This is like 'lstat()', except it refuses to follow symlinks
219 * in the path, after skipping "skiplen".
221 static int check_path(const char *path, int len, struct stat *st, int skiplen)
223 const char *slash = path + len;
225 while (path < slash && *slash != '/')
226 slash--;
227 if (!has_dirs_only_path(path, slash - path, skiplen)) {
228 errno = ENOENT;
229 return -1;
231 return lstat(path, st);
234 int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
236 static char path[PATH_MAX + 1];
237 struct stat st;
238 int len = state->base_dir_len;
240 if (topath)
241 return write_entry(ce, topath, state, 1);
243 memcpy(path, state->base_dir, len);
244 strcpy(path + len, ce->name);
245 len += ce_namelen(ce);
247 if (!check_path(path, len, &st, state->base_dir_len)) {
248 unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
249 if (!changed)
250 return 0;
251 if (!state->force) {
252 if (!state->quiet)
253 fprintf(stderr, "%s already exists, no checkout\n", path);
254 return -1;
258 * We unlink the old file, to get the new one with the
259 * right permissions (including umask, which is nasty
260 * to emulate by hand - much easier to let the system
261 * just do the right thing)
263 if (S_ISDIR(st.st_mode)) {
264 /* If it is a gitlink, leave it alone! */
265 if (S_ISGITLINK(ce->ce_mode))
266 return 0;
267 if (!state->force)
268 return error("%s is a directory", path);
269 remove_subtree(path);
270 } else if (unlink(path))
271 return error("unable to unlink old '%s' (%s)", path, strerror(errno));
272 } else if (state->not_new)
273 return 0;
274 create_directories(path, len, state);
275 return write_entry(ce, path, state, 0);