Start preparing for 1.8.4.2
[alt-git.git] / entry.c
blobacc892f9a62b5bc3d3442b044b29bf8d763bf3ba
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(const 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, const 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(const 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 = 0;
124 int fd;
126 fd = open_output_fd(path, ce, to_tempfile);
127 if (fd < 0)
128 return -1;
130 result |= stream_blob_to_fd(fd, ce->sha1, filter, 1);
131 *fstat_done = fstat_output(fd, state, statbuf);
132 result |= close(fd);
134 if (result)
135 unlink(path);
136 return result;
139 static int write_entry(struct cache_entry *ce,
140 char *path, const struct checkout *state, int to_tempfile)
142 unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
143 int fd, ret, fstat_done = 0;
144 char *new;
145 struct strbuf buf = STRBUF_INIT;
146 unsigned long size;
147 size_t wrote, newsize = 0;
148 struct stat st;
150 if (ce_mode_s_ifmt == S_IFREG) {
151 struct stream_filter *filter = get_stream_filter(ce->name, ce->sha1);
152 if (filter &&
153 !streaming_write_entry(ce, path, filter,
154 state, to_tempfile,
155 &fstat_done, &st))
156 goto finish;
159 switch (ce_mode_s_ifmt) {
160 case S_IFREG:
161 case S_IFLNK:
162 new = read_blob_entry(ce, &size);
163 if (!new)
164 return error("unable to read sha1 file of %s (%s)",
165 path, sha1_to_hex(ce->sha1));
167 if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
168 ret = symlink(new, path);
169 free(new);
170 if (ret)
171 return error("unable to create symlink %s (%s)",
172 path, strerror(errno));
173 break;
177 * Convert from git internal format to working tree format
179 if (ce_mode_s_ifmt == S_IFREG &&
180 convert_to_working_tree(ce->name, new, size, &buf)) {
181 free(new);
182 new = strbuf_detach(&buf, &newsize);
183 size = newsize;
186 fd = open_output_fd(path, ce, to_tempfile);
187 if (fd < 0) {
188 free(new);
189 return error("unable to create file %s (%s)",
190 path, strerror(errno));
193 wrote = write_in_full(fd, new, size);
194 if (!to_tempfile)
195 fstat_done = fstat_output(fd, state, &st);
196 close(fd);
197 free(new);
198 if (wrote != size)
199 return error("unable to write file %s", path);
200 break;
201 case S_IFGITLINK:
202 if (to_tempfile)
203 return error("cannot create temporary submodule %s", path);
204 if (mkdir(path, 0777) < 0)
205 return error("cannot create submodule directory %s", path);
206 break;
207 default:
208 return error("unknown file mode for %s in index", path);
211 finish:
212 if (state->refresh_cache) {
213 if (!fstat_done)
214 lstat(ce->name, &st);
215 fill_stat_cache_info(ce, &st);
217 return 0;
221 * This is like 'lstat()', except it refuses to follow symlinks
222 * in the path, after skipping "skiplen".
224 static int check_path(const char *path, int len, struct stat *st, int skiplen)
226 const char *slash = path + len;
228 while (path < slash && *slash != '/')
229 slash--;
230 if (!has_dirs_only_path(path, slash - path, skiplen)) {
231 errno = ENOENT;
232 return -1;
234 return lstat(path, st);
237 int checkout_entry(struct cache_entry *ce,
238 const struct checkout *state, char *topath)
240 static char path[PATH_MAX + 1];
241 struct stat st;
242 int len = state->base_dir_len;
244 if (topath)
245 return write_entry(ce, topath, state, 1);
247 memcpy(path, state->base_dir, len);
248 strcpy(path + len, ce->name);
249 len += ce_namelen(ce);
251 if (!check_path(path, len, &st, state->base_dir_len)) {
252 unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
253 if (!changed)
254 return 0;
255 if (!state->force) {
256 if (!state->quiet)
257 fprintf(stderr, "%s already exists, no checkout\n", path);
258 return -1;
262 * We unlink the old file, to get the new one with the
263 * right permissions (including umask, which is nasty
264 * to emulate by hand - much easier to let the system
265 * just do the right thing)
267 if (S_ISDIR(st.st_mode)) {
268 /* If it is a gitlink, leave it alone! */
269 if (S_ISGITLINK(ce->ce_mode))
270 return 0;
271 if (!state->force)
272 return error("%s is a directory", path);
273 remove_subtree(path);
274 } else if (unlink(path))
275 return error("unable to unlink old '%s' (%s)", path, strerror(errno));
276 } else if (state->not_new)
277 return 0;
278 create_directories(path, len, state);
279 return write_entry(ce, path, state, 0);