convert: refactor capabilities negotiation
[git/git.git] / entry.c
CommitLineData
12dccc16 1#include "cache.h"
8e440259 2#include "blob.h"
8ca12c0d 3#include "dir.h"
dd8e9121 4#include "streaming.h"
6d14eac3 5#include "submodule.h"
12dccc16 6
81a9aa60
KB
7static void create_directories(const char *path, int path_len,
8 const struct checkout *state)
12dccc16 9{
3733e694 10 char *buf = xmallocz(path_len);
81a9aa60
KB
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;
12dccc16 20 buf[len] = 0;
fa2e71c9 21
bad4a54f
KB
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 */
57199892 29 if (has_dirs_only_path(buf, len, state->base_dir_len))
fa2e71c9
JH
30 continue; /* ok, it is already a directory. */
31
32 /*
bad4a54f
KB
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.
fa2e71c9 37 */
f312de01 38 if (mkdir(buf, 0777)) {
fa2e71c9 39 if (errno == EEXIST && state->force &&
691f1a28 40 !unlink_or_warn(buf) && !mkdir(buf, 0777))
fa2e71c9 41 continue;
0721c314 42 die_errno("cannot create directory at '%s'", buf);
12dccc16
LT
43 }
44 }
45 free(buf);
46}
47
2f29e0c6 48static void remove_subtree(struct strbuf *path)
12dccc16 49{
2f29e0c6 50 DIR *dir = opendir(path->buf);
12dccc16 51 struct dirent *de;
2f29e0c6 52 int origlen = path->len;
a6080a0a 53
12dccc16 54 if (!dir)
2f29e0c6 55 die_errno("cannot opendir '%s'", path->buf);
12dccc16
LT
56 while ((de = readdir(dir)) != NULL) {
57 struct stat st;
2f29e0c6 58
8ca12c0d 59 if (is_dot_or_dotdot(de->d_name))
12dccc16 60 continue;
2f29e0c6
MH
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);
12dccc16 66 if (S_ISDIR(st.st_mode))
2f29e0c6
MH
67 remove_subtree(path);
68 else if (unlink(path->buf))
69 die_errno("cannot unlink '%s'", path->buf);
70 strbuf_setlen(path, origlen);
12dccc16
LT
71 }
72 closedir(dir);
2f29e0c6
MH
73 if (rmdir(path->buf))
74 die_errno("cannot rmdir '%s'", path->buf);
12dccc16
LT
75}
76
d48a72f3 77static int create_file(const char *path, unsigned int mode)
12dccc16 78{
12dccc16 79 mode = (mode & 0100) ? 0777 : 0666;
781411ed 80 return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
12dccc16
LT
81}
82
9c5e6c80 83static void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
f0807e62
LT
84{
85 enum object_type type;
99d1a986 86 void *new = read_sha1_file(ce->oid.hash, &type, size);
f0807e62
LT
87
88 if (new) {
89 if (type == OBJ_BLOB)
90 return new;
91 free(new);
92 }
93 return NULL;
94}
95
9c5e6c80 96static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile)
fd5db55d
JH
97{
98 int symlink = (ce->ce_mode & S_IFMT) != S_IFREG;
99 if (to_tempfile) {
330c8e26
JK
100 xsnprintf(path, TEMPORARY_FILENAME_LENGTH, "%s",
101 symlink ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX");
fd5db55d
JH
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
9c5e6c80 119static int streaming_write_entry(const struct cache_entry *ce, char *path,
b6691092 120 struct stream_filter *filter,
dd8e9121
JH
121 const struct checkout *state, int to_tempfile,
122 int *fstat_done, struct stat *statbuf)
123{
d9c31e14 124 int result = 0;
47a02ff2 125 int fd;
dd8e9121
JH
126
127 fd = open_output_fd(path, ce, to_tempfile);
d9c31e14
JK
128 if (fd < 0)
129 return -1;
130
7eda0e4f 131 result |= stream_blob_to_fd(fd, &ce->oid, filter, 1);
d9c31e14
JK
132 *fstat_done = fstat_output(fd, state, statbuf);
133 result |= close(fd);
134
135 if (result)
dd8e9121
JH
136 unlink(path);
137 return result;
138}
139
9c5e6c80
NTND
140static int write_entry(struct cache_entry *ce,
141 char *path, const struct checkout *state, int to_tempfile)
12dccc16 142{
4857c761 143 unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
e4c72923 144 int fd, ret, fstat_done = 0;
4857c761
KB
145 char *new;
146 struct strbuf buf = STRBUF_INIT;
147 unsigned long size;
148 size_t wrote, newsize = 0;
e4c72923 149 struct stat st;
6d14eac3 150 const struct submodule *sub;
4857c761 151
b6691092 152 if (ce_mode_s_ifmt == S_IFREG) {
99d1a986 153 struct stream_filter *filter = get_stream_filter(ce->name,
154 ce->oid.hash);
b6691092
JH
155 if (filter &&
156 !streaming_write_entry(ce, path, filter,
157 state, to_tempfile,
158 &fstat_done, &st))
159 goto finish;
160 }
dd8e9121 161
4857c761 162 switch (ce_mode_s_ifmt) {
12dccc16 163 case S_IFREG:
4857c761
KB
164 case S_IFLNK:
165 new = read_blob_entry(ce, &size);
f0807e62 166 if (!new)
d43e9073 167 return error("unable to read sha1 file of %s (%s)",
99d1a986 168 path, oid_to_hex(&ce->oid));
1a9d7e9b 169
4857c761
KB
170 if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
171 ret = symlink(new, path);
172 free(new);
173 if (ret)
e1ebb3c2
NTND
174 return error_errno("unable to create symlink %s",
175 path);
4857c761
KB
176 break;
177 }
178
1a9d7e9b
JH
179 /*
180 * Convert from git internal format to working tree format
181 */
4857c761
KB
182 if (ce_mode_s_ifmt == S_IFREG &&
183 convert_to_working_tree(ce->name, new, size, &buf)) {
1a9d7e9b 184 free(new);
c32f749f
RS
185 new = strbuf_detach(&buf, &newsize);
186 size = newsize;
1a9d7e9b
JH
187 }
188
fd5db55d 189 fd = open_output_fd(path, ce, to_tempfile);
12dccc16
LT
190 if (fd < 0) {
191 free(new);
e1ebb3c2 192 return error_errno("unable to create file %s", path);
12dccc16 193 }
6c510bee 194
93822c22 195 wrote = write_in_full(fd, new, size);
fd5db55d
JH
196 if (!to_tempfile)
197 fstat_done = fstat_output(fd, state, &st);
12dccc16
LT
198 close(fd);
199 free(new);
200 if (wrote != size)
d43e9073 201 return error("unable to write file %s", path);
12dccc16 202 break;
302b9282 203 case S_IFGITLINK:
f0807e62 204 if (to_tempfile)
42063f95 205 return error("cannot create temporary submodule %s", path);
f0807e62 206 if (mkdir(path, 0777) < 0)
42063f95 207 return error("cannot create submodule directory %s", path);
6d14eac3
SB
208 sub = submodule_from_ce(ce);
209 if (sub)
210 return submodule_move_head(ce->name,
cd279e2e
SB
211 NULL, oid_to_hex(&ce->oid),
212 state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
f0807e62 213 break;
12dccc16 214 default:
d43e9073 215 return error("unknown file mode for %s in index", path);
12dccc16
LT
216 }
217
dd8e9121 218finish:
6ee67f26 219 if (state->refresh_cache) {
d4a2024a 220 assert(state->istate);
e4c72923
KB
221 if (!fstat_done)
222 lstat(ce->name, &st);
12dccc16 223 fill_stat_cache_info(ce, &st);
078a58e8 224 ce->ce_flags |= CE_UPDATE_IN_BASE;
d4a2024a 225 state->istate->cache_changed |= CE_ENTRY_CHANGED;
12dccc16
LT
226 }
227 return 0;
228}
229
b6986d8a
LT
230/*
231 * This is like 'lstat()', except it refuses to follow symlinks
da02ca50 232 * in the path, after skipping "skiplen".
b6986d8a 233 */
61b97df7 234static int check_path(const char *path, int len, struct stat *st, int skiplen)
b6986d8a 235{
da02ca50
JH
236 const char *slash = path + len;
237
238 while (path < slash && *slash != '/')
239 slash--;
240 if (!has_dirs_only_path(path, slash - path, skiplen)) {
b6986d8a
LT
241 errno = ENOENT;
242 return -1;
243 }
244 return lstat(path, st);
245}
246
af2a651d
JH
247/*
248 * Write the contents from ce out to the working tree.
249 *
250 * When topath[] is not NULL, instead of writing to the working tree
251 * file named by ce, a temporary file is created by this function and
252 * its name is returned in topath[], which must be able to hold at
253 * least TEMPORARY_FILENAME_LENGTH bytes long.
254 */
9c5e6c80
NTND
255int checkout_entry(struct cache_entry *ce,
256 const struct checkout *state, char *topath)
12dccc16 257{
f63272a3 258 static struct strbuf path = STRBUF_INIT;
de84f99c 259 struct stat st;
12dccc16 260
de84f99c
SP
261 if (topath)
262 return write_entry(ce, topath, state, 1);
263
f63272a3
MH
264 strbuf_reset(&path);
265 strbuf_add(&path, state->base_dir, state->base_dir_len);
266 strbuf_add(&path, ce->name, ce_namelen(ce));
12dccc16 267
f63272a3 268 if (!check_path(path.buf, path.len, &st, state->base_dir_len)) {
6d14eac3 269 const struct submodule *sub;
56cac48c 270 unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
6d14eac3
SB
271 /*
272 * Needs to be checked before !changed returns early,
273 * as the possibly empty directory was not changed
274 */
275 sub = submodule_from_ce(ce);
276 if (sub) {
277 int err;
278 if (!is_submodule_populated_gently(ce->name, &err)) {
279 struct stat sb;
280 if (lstat(ce->name, &sb))
281 die(_("could not stat file '%s'"), ce->name);
282 if (!(st.st_mode & S_IFDIR))
283 unlink_or_warn(ce->name);
284
285 return submodule_move_head(ce->name,
cd279e2e 286 NULL, oid_to_hex(&ce->oid), 0);
6d14eac3
SB
287 } else
288 return submodule_move_head(ce->name,
289 "HEAD", oid_to_hex(&ce->oid),
cd279e2e 290 state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
6d14eac3
SB
291 }
292
12dccc16
LT
293 if (!changed)
294 return 0;
295 if (!state->force) {
296 if (!state->quiet)
f63272a3
MH
297 fprintf(stderr,
298 "%s already exists, no checkout\n",
299 path.buf);
4b12dae6 300 return -1;
12dccc16
LT
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 */
d48a72f3 309 if (S_ISDIR(st.st_mode)) {
f0807e62 310 /* If it is a gitlink, leave it alone! */
7a51ed66 311 if (S_ISGITLINK(ce->ce_mode))
f0807e62 312 return 0;
d48a72f3 313 if (!state->force)
f63272a3 314 return error("%s is a directory", path.buf);
2f29e0c6 315 remove_subtree(&path);
f63272a3 316 } else if (unlink(path.buf))
e1ebb3c2 317 return error_errno("unable to unlink old '%s'", path.buf);
de84f99c 318 } else if (state->not_new)
12dccc16 319 return 0;
f63272a3
MH
320
321 create_directories(path.buf, path.len, state);
322 return write_entry(ce, path.buf, state, 0);
12dccc16 323}