Twelfth batch for 2.13
[git/git.git] / entry.c
... / ...
CommitLineData
1#include "cache.h"
2#include "blob.h"
3#include "dir.h"
4#include "streaming.h"
5#include "submodule.h"
6
7static void create_directories(const char *path, int path_len,
8 const struct checkout *state)
9{
10 char *buf = xmallocz(path_len);
11 int len = 0;
12
13 while (len < path_len) {
14 do {
15 buf[len] = path[len];
16 len++;
17 } while (len < path_len && path[len] != '/');
18 if (len >= path_len)
19 break;
20 buf[len] = 0;
21
22 /*
23 * For 'checkout-index --prefix=<dir>', <dir> is
24 * allowed to be a symlink to an existing directory,
25 * and we set 'state->base_dir_len' below, such that
26 * we test the path components of the prefix with the
27 * stat() function instead of the lstat() function.
28 */
29 if (has_dirs_only_path(buf, len, state->base_dir_len))
30 continue; /* ok, it is already a directory. */
31
32 /*
33 * If this mkdir() would fail, it could be that there
34 * is already a symlink or something else exists
35 * there, therefore we then try to unlink it and try
36 * one more time to create the directory.
37 */
38 if (mkdir(buf, 0777)) {
39 if (errno == EEXIST && state->force &&
40 !unlink_or_warn(buf) && !mkdir(buf, 0777))
41 continue;
42 die_errno("cannot create directory at '%s'", buf);
43 }
44 }
45 free(buf);
46}
47
48static void remove_subtree(struct strbuf *path)
49{
50 DIR *dir = opendir(path->buf);
51 struct dirent *de;
52 int origlen = path->len;
53
54 if (!dir)
55 die_errno("cannot opendir '%s'", path->buf);
56 while ((de = readdir(dir)) != NULL) {
57 struct stat st;
58
59 if (is_dot_or_dotdot(de->d_name))
60 continue;
61
62 strbuf_addch(path, '/');
63 strbuf_addstr(path, de->d_name);
64 if (lstat(path->buf, &st))
65 die_errno("cannot lstat '%s'", path->buf);
66 if (S_ISDIR(st.st_mode))
67 remove_subtree(path);
68 else if (unlink(path->buf))
69 die_errno("cannot unlink '%s'", path->buf);
70 strbuf_setlen(path, origlen);
71 }
72 closedir(dir);
73 if (rmdir(path->buf))
74 die_errno("cannot rmdir '%s'", path->buf);
75}
76
77static int create_file(const char *path, unsigned int mode)
78{
79 mode = (mode & 0100) ? 0777 : 0666;
80 return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
81}
82
83static void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
84{
85 enum object_type type;
86 void *new = read_sha1_file(ce->oid.hash, &type, size);
87
88 if (new) {
89 if (type == OBJ_BLOB)
90 return new;
91 free(new);
92 }
93 return NULL;
94}
95
96static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile)
97{
98 int symlink = (ce->ce_mode & S_IFMT) != S_IFREG;
99 if (to_tempfile) {
100 xsnprintf(path, TEMPORARY_FILENAME_LENGTH, "%s",
101 symlink ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX");
102 return mkstemp(path);
103 } else {
104 return create_file(path, !symlink ? ce->ce_mode : 0666);
105 }
106}
107
108static int fstat_output(int fd, const struct checkout *state, struct stat *st)
109{
110 /* use fstat() only when path == ce->name */
111 if (fstat_is_reliable() &&
112 state->refresh_cache && !state->base_dir_len) {
113 fstat(fd, st);
114 return 1;
115 }
116 return 0;
117}
118
119static int streaming_write_entry(const struct cache_entry *ce, char *path,
120 struct stream_filter *filter,
121 const struct checkout *state, int to_tempfile,
122 int *fstat_done, struct stat *statbuf)
123{
124 int result = 0;
125 int fd;
126
127 fd = open_output_fd(path, ce, to_tempfile);
128 if (fd < 0)
129 return -1;
130
131 result |= stream_blob_to_fd(fd, &ce->oid, filter, 1);
132 *fstat_done = fstat_output(fd, state, statbuf);
133 result |= close(fd);
134
135 if (result)
136 unlink(path);
137 return result;
138}
139
140static int write_entry(struct cache_entry *ce,
141 char *path, const struct checkout *state, int to_tempfile)
142{
143 unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
144 int fd, ret, fstat_done = 0;
145 char *new;
146 struct strbuf buf = STRBUF_INIT;
147 unsigned long size;
148 size_t wrote, newsize = 0;
149 struct stat st;
150 const struct submodule *sub;
151
152 if (ce_mode_s_ifmt == S_IFREG) {
153 struct stream_filter *filter = get_stream_filter(ce->name,
154 ce->oid.hash);
155 if (filter &&
156 !streaming_write_entry(ce, path, filter,
157 state, to_tempfile,
158 &fstat_done, &st))
159 goto finish;
160 }
161
162 switch (ce_mode_s_ifmt) {
163 case S_IFREG:
164 case S_IFLNK:
165 new = read_blob_entry(ce, &size);
166 if (!new)
167 return error("unable to read sha1 file of %s (%s)",
168 path, oid_to_hex(&ce->oid));
169
170 if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
171 ret = symlink(new, path);
172 free(new);
173 if (ret)
174 return error_errno("unable to create symlink %s",
175 path);
176 break;
177 }
178
179 /*
180 * Convert from git internal format to working tree format
181 */
182 if (ce_mode_s_ifmt == S_IFREG &&
183 convert_to_working_tree(ce->name, new, size, &buf)) {
184 free(new);
185 new = strbuf_detach(&buf, &newsize);
186 size = newsize;
187 }
188
189 fd = open_output_fd(path, ce, to_tempfile);
190 if (fd < 0) {
191 free(new);
192 return error_errno("unable to create file %s", path);
193 }
194
195 wrote = write_in_full(fd, new, size);
196 if (!to_tempfile)
197 fstat_done = fstat_output(fd, state, &st);
198 close(fd);
199 free(new);
200 if (wrote != size)
201 return error("unable to write file %s", path);
202 break;
203 case S_IFGITLINK:
204 if (to_tempfile)
205 return error("cannot create temporary submodule %s", path);
206 if (mkdir(path, 0777) < 0)
207 return error("cannot create submodule directory %s", path);
208 sub = submodule_from_ce(ce);
209 if (sub)
210 return submodule_move_head(ce->name,
211 NULL, oid_to_hex(&ce->oid), SUBMODULE_MOVE_HEAD_FORCE);
212 break;
213 default:
214 return error("unknown file mode for %s in index", path);
215 }
216
217finish:
218 if (state->refresh_cache) {
219 assert(state->istate);
220 if (!fstat_done)
221 lstat(ce->name, &st);
222 fill_stat_cache_info(ce, &st);
223 ce->ce_flags |= CE_UPDATE_IN_BASE;
224 state->istate->cache_changed |= CE_ENTRY_CHANGED;
225 }
226 return 0;
227}
228
229/*
230 * This is like 'lstat()', except it refuses to follow symlinks
231 * in the path, after skipping "skiplen".
232 */
233static int check_path(const char *path, int len, struct stat *st, int skiplen)
234{
235 const char *slash = path + len;
236
237 while (path < slash && *slash != '/')
238 slash--;
239 if (!has_dirs_only_path(path, slash - path, skiplen)) {
240 errno = ENOENT;
241 return -1;
242 }
243 return lstat(path, st);
244}
245
246/*
247 * Write the contents from ce out to the working tree.
248 *
249 * When topath[] is not NULL, instead of writing to the working tree
250 * file named by ce, a temporary file is created by this function and
251 * its name is returned in topath[], which must be able to hold at
252 * least TEMPORARY_FILENAME_LENGTH bytes long.
253 */
254int checkout_entry(struct cache_entry *ce,
255 const struct checkout *state, char *topath)
256{
257 static struct strbuf path = STRBUF_INIT;
258 struct stat st;
259
260 if (topath)
261 return write_entry(ce, topath, state, 1);
262
263 strbuf_reset(&path);
264 strbuf_add(&path, state->base_dir, state->base_dir_len);
265 strbuf_add(&path, ce->name, ce_namelen(ce));
266
267 if (!check_path(path.buf, path.len, &st, state->base_dir_len)) {
268 const struct submodule *sub;
269 unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
270 /*
271 * Needs to be checked before !changed returns early,
272 * as the possibly empty directory was not changed
273 */
274 sub = submodule_from_ce(ce);
275 if (sub) {
276 int err;
277 if (!is_submodule_populated_gently(ce->name, &err)) {
278 struct stat sb;
279 if (lstat(ce->name, &sb))
280 die(_("could not stat file '%s'"), ce->name);
281 if (!(st.st_mode & S_IFDIR))
282 unlink_or_warn(ce->name);
283
284 return submodule_move_head(ce->name,
285 NULL, oid_to_hex(&ce->oid),
286 SUBMODULE_MOVE_HEAD_FORCE);
287 } else
288 return submodule_move_head(ce->name,
289 "HEAD", oid_to_hex(&ce->oid),
290 SUBMODULE_MOVE_HEAD_FORCE);
291 }
292
293 if (!changed)
294 return 0;
295 if (!state->force) {
296 if (!state->quiet)
297 fprintf(stderr,
298 "%s already exists, no checkout\n",
299 path.buf);
300 return -1;
301 }
302
303 /*
304 * We unlink the old file, to get the new one with the
305 * right permissions (including umask, which is nasty
306 * to emulate by hand - much easier to let the system
307 * just do the right thing)
308 */
309 if (S_ISDIR(st.st_mode)) {
310 /* If it is a gitlink, leave it alone! */
311 if (S_ISGITLINK(ce->ce_mode))
312 return 0;
313 if (!state->force)
314 return error("%s is a directory", path.buf);
315 remove_subtree(&path);
316 } else if (unlink(path.buf))
317 return error_errno("unable to unlink old '%s'", path.buf);
318 } else if (state->not_new)
319 return 0;
320
321 create_directories(path.buf, path.len, state);
322 return write_entry(ce, path.buf, state, 0);
323}