summaryrefslogtreecommitdiff
path: root/entry.c
blob: ce80d2921326d0c3720442b91a59fb0a4aecb281 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
#include "cache.h"
#include "blob.h"
#include "dir.h"
#include "streaming.h"
 
static void create_directories(const char *path, int path_len,
			       const struct checkout *state)
{
	char *buf = xmallocz(path_len);
	int len = 0;
 
	while (len < path_len) {
		do {
			buf[len] = path[len];
			len++;
		} while (len < path_len && path[len] != '/');
		if (len >= path_len)
			break;
		buf[len] = 0;
 
		/*
		 * For 'checkout-index --prefix=<dir>', <dir> is
		 * allowed to be a symlink to an existing directory,
		 * and we set 'state->base_dir_len' below, such that
		 * we test the path components of the prefix with the
		 * stat() function instead of the lstat() function.
		 */
		if (has_dirs_only_path(buf, len, state->base_dir_len))
			continue; /* ok, it is already a directory. */
 
		/*
		 * If this mkdir() would fail, it could be that there
		 * is already a symlink or something else exists
		 * there, therefore we then try to unlink it and try
		 * one more time to create the directory.
		 */
		if (mkdir(buf, 0777)) {
			if (errno == EEXIST && state->force &&
			    !unlink_or_warn(buf) && !mkdir(buf, 0777))
				continue;
			die_errno("cannot create directory at '%s'", buf);
		}
	}
	free(buf);
}
 
static void remove_subtree(struct strbuf *path)
{
	DIR *dir = opendir(path->buf);
	struct dirent *de;
	int origlen = path->len;
 
	if (!dir)
		die_errno("cannot opendir '%s'", path->buf);
	while ((de = readdir(dir)) != NULL) {
		struct stat st;
 
		if (is_dot_or_dotdot(de->d_name))
			continue;
 
		strbuf_addch(path, '/');
		strbuf_addstr(path, de->d_name);
		if (lstat(path->buf, &st))
			die_errno("cannot lstat '%s'", path->buf);
		if (S_ISDIR(st.st_mode))
			remove_subtree(path);
		else if (unlink(path->buf))
			die_errno("cannot unlink '%s'", path->buf);
		strbuf_setlen(path, origlen);
	}
	closedir(dir);
	if (rmdir(path->buf))
		die_errno("cannot rmdir '%s'", path->buf);
}
 
static int create_file(const char *path, unsigned int mode)
{
	mode = (mode & 0100) ? 0777 : 0666;
	return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
}
 
static void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
{
	enum object_type type;
	void *new = read_sha1_file(ce->oid.hash, &type, size);
 
	if (new) {
		if (type == OBJ_BLOB)
			return new;
		free(new);
	}
	return NULL;
}
 
static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile)
{
	int symlink = (ce->ce_mode & S_IFMT) != S_IFREG;
	if (to_tempfile) {
		xsnprintf(path, TEMPORARY_FILENAME_LENGTH, "%s",
			  symlink ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX");
		return mkstemp(path);
	} else {
		return create_file(path, !symlink ? ce->ce_mode : 0666);
	}
}
 
static int fstat_output(int fd, const struct checkout *state, struct stat *st)
{
	/* use fstat() only when path == ce->name */
	if (fstat_is_reliable() &&
	    state->refresh_cache && !state->base_dir_len) {
		fstat(fd, st);
		return 1;
	}
	return 0;
}
 
static int streaming_write_entry(const struct cache_entry *ce, char *path,
				 struct stream_filter *filter,
				 const struct checkout *state, int to_tempfile,
				 int *fstat_done, struct stat *statbuf)
{
	int result = 0;
	int fd;
 
	fd = open_output_fd(path, ce, to_tempfile);
	if (fd < 0)
		return -1;
 
	result |= stream_blob_to_fd(fd, ce->oid.hash, filter, 1);
	*fstat_done = fstat_output(fd, state, statbuf);
	result |= close(fd);
 
	if (result)
		unlink(path);
	return result;
}
 
static int write_entry(struct cache_entry *ce,
		       char *path, const struct checkout *state, int to_tempfile)
{
	unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
	int fd, ret, fstat_done = 0;
	char *new;
	struct strbuf buf = STRBUF_INIT;
	unsigned long size;
	size_t wrote, newsize = 0;
	struct stat st;
 
	if (ce_mode_s_ifmt == S_IFREG) {
		struct stream_filter *filter = get_stream_filter(ce->name,
								 ce->oid.hash);
		if (filter &&
		    !streaming_write_entry(ce, path, filter,
					   state, to_tempfile,
					   &fstat_done, &st))
			goto finish;
	}
 
	switch (ce_mode_s_ifmt) {
	case S_IFREG:
	case S_IFLNK:
		new = read_blob_entry(ce, &size);
		if (!new)
			return error("unable to read sha1 file of %s (%s)",
				path, oid_to_hex(&ce->oid));
 
		if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
			ret = symlink(new, path);
			free(new);
			if (ret)
				return error_errno("unable to create symlink %s",
						   path);
			break;
		}
 
		/*
		 * Convert from git internal format to working tree format
		 */
		if (ce_mode_s_ifmt == S_IFREG &&
		    convert_to_working_tree(ce->name, new, size, &buf)) {
			free(new);
			new = strbuf_detach(&buf, &newsize);
			size = newsize;
		}
 
		fd = open_output_fd(path, ce, to_tempfile);
		if (fd < 0) {
			free(new);
			return error_errno("unable to create file %s", path);
		}
 
		wrote = write_in_full(fd, new, size);
		if (!to_tempfile)
			fstat_done = fstat_output(fd, state, &st);
		close(fd);
		free(new);
		if (wrote != size)
			return error("unable to write file %s", path);
		break;
	case S_IFGITLINK:
		if (to_tempfile)
			return error("cannot create temporary submodule %s", path);
		if (mkdir(path, 0777) < 0)
			return error("cannot create submodule directory %s", path);
		break;
	default:
		return error("unknown file mode for %s in index", path);
	}
 
finish:
	if (state->refresh_cache) {
		assert(state->istate);
		if (!fstat_done)
			lstat(ce->name, &st);
		fill_stat_cache_info(ce, &st);
		ce->ce_flags |= CE_UPDATE_IN_BASE;
		state->istate->cache_changed |= CE_ENTRY_CHANGED;
	}
	return 0;
}
 
/*
 * This is like 'lstat()', except it refuses to follow symlinks
 * in the path, after skipping "skiplen".
 */
static int check_path(const char *path, int len, struct stat *st, int skiplen)
{
	const char *slash = path + len;
 
	while (path < slash && *slash != '/')
		slash--;
	if (!has_dirs_only_path(path, slash - path, skiplen)) {
		errno = ENOENT;
		return -1;
	}
	return lstat(path, st);
}
 
/*
 * Write the contents from ce out to the working tree.
 *
 * When topath[] is not NULL, instead of writing to the working tree
 * file named by ce, a temporary file is created by this function and
 * its name is returned in topath[], which must be able to hold at
 * least TEMPORARY_FILENAME_LENGTH bytes long.
 */
int checkout_entry(struct cache_entry *ce,
		   const struct checkout *state, char *topath)
{
	static struct strbuf path = STRBUF_INIT;
	struct stat st;
 
	if (topath)
		return write_entry(ce, topath, state, 1);
 
	strbuf_reset(&path);
	strbuf_add(&path, state->base_dir, state->base_dir_len);
	strbuf_add(&path, ce->name, ce_namelen(ce));
 
	if (!check_path(path.buf, path.len, &st, state->base_dir_len)) {
		unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
		if (!changed)
			return 0;
		if (!state->force) {
			if (!state->quiet)
				fprintf(stderr,
					"%s already exists, no checkout\n",
					path.buf);
			return -1;
		}
 
		/*
		 * We unlink the old file, to get the new one with the
		 * right permissions (including umask, which is nasty
		 * to emulate by hand - much easier to let the system
		 * just do the right thing)
		 */
		if (S_ISDIR(st.st_mode)) {
			/* If it is a gitlink, leave it alone! */
			if (S_ISGITLINK(ce->ce_mode))
				return 0;
			if (!state->force)
				return error("%s is a directory", path.buf);
			remove_subtree(&path);
		} else if (unlink(path.buf))
			return error_errno("unable to unlink old '%s'", path.buf);
	} else if (state->not_new)
		return 0;
 
	create_directories(path.buf, path.len, state);
	return write_entry(ce, path.buf, state, 0);
}