1#include "cache.h"
2#include "blob.h"
3#include "dir.h"
4static void create_directories(const char *path, int path_len,
6 const struct checkout *state)
7{
8 char *buf = xmalloc(path_len + 1);
9 int len = 0;
10 while (len < path_len) {
12 do {
13 buf[len] = path[len];
14 len++;
15 } while (len < path_len && path[len] != '/');
16 if (len >= path_len)
17 break;
18 buf[len] = 0;
19 /*
21 * For 'checkout-index --prefix=<dir>', <dir> is
22 * allowed to be a symlink to an existing directory,
23 * and we set 'state->base_dir_len' below, such that
24 * we test the path components of the prefix with the
25 * stat() function instead of the lstat() function.
26 */
27 if (has_dirs_only_path(buf, len, state->base_dir_len))
28 continue; /* ok, it is already a directory. */
29 /*
31 * If this mkdir() would fail, it could be that there
32 * is already a symlink or something else exists
33 * there, therefore we then try to unlink it and try
34 * one more time to create the directory.
35 */
36 if (mkdir(buf, 0777)) {
37 if (errno == EEXIST && state->force &&
38 !unlink_or_warn(buf) && !mkdir(buf, 0777))
39 continue;
40 die_errno("cannot create directory at '%s'", buf);
41 }
42 }
43 free(buf);
44}
45static void remove_subtree(const char *path)
47{
48 DIR *dir = opendir(path);
49 struct dirent *de;
50 char pathbuf[PATH_MAX];
51 char *name;
52 if (!dir)
54 die_errno("cannot opendir '%s'", path);
55 strcpy(pathbuf, path);
56 name = pathbuf + strlen(path);
57 *name++ = '/';
58 while ((de = readdir(dir)) != NULL) {
59 struct stat st;
60 if (is_dot_or_dotdot(de->d_name))
61 continue;
62 strcpy(name, de->d_name);
63 if (lstat(pathbuf, &st))
64 die_errno("cannot lstat '%s'", pathbuf);
65 if (S_ISDIR(st.st_mode))
66 remove_subtree(pathbuf);
67 else if (unlink(pathbuf))
68 die_errno("cannot unlink '%s'", pathbuf);
69 }
70 closedir(dir);
71 if (rmdir(path))
72 die_errno("cannot rmdir '%s'", path);
73}
74static int create_file(const char *path, unsigned int mode)
76{
77 mode = (mode & 0100) ? 0777 : 0666;
78 return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
79}
80static void *read_blob_entry(struct cache_entry *ce, unsigned long *size)
82{
83 enum object_type type;
84 void *new = read_sha1_file(ce->sha1, &type, size);
85 if (new) {
87 if (type == OBJ_BLOB)
88 return new;
89 free(new);
90 }
91 return NULL;
92}
93static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
95{
96 unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
97 int fd, ret, fstat_done = 0;
98 char *new;
99 struct strbuf buf = STRBUF_INIT;
100 unsigned long size;
101 size_t wrote, newsize = 0;
102 struct stat st;
103 switch (ce_mode_s_ifmt) {
105 case S_IFREG:
106 case S_IFLNK:
107 new = read_blob_entry(ce, &size);
108 if (!new)
109 return error("git checkout-index: unable to read sha1 file of %s (%s)",
110 path, sha1_to_hex(ce->sha1));
111 if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
113 ret = symlink(new, path);
114 free(new);
115 if (ret)
116 return error("git checkout-index: unable to create symlink %s (%s)",
117 path, strerror(errno));
118 break;
119 }
120 /*
122 * Convert from git internal format to working tree format
123 */
124 if (ce_mode_s_ifmt == S_IFREG &&
125 convert_to_working_tree(ce->name, new, size, &buf)) {
126 free(new);
127 new = strbuf_detach(&buf, &newsize);
128 size = newsize;
129 }
130 if (to_tempfile) {
132 if (ce_mode_s_ifmt == S_IFREG)
133 strcpy(path, ".merge_file_XXXXXX");
134 else
135 strcpy(path, ".merge_link_XXXXXX");
136 fd = mkstemp(path);
137 } else if (ce_mode_s_ifmt == S_IFREG) {
138 fd = create_file(path, ce->ce_mode);
139 } else {
140 fd = create_file(path, 0666);
141 }
142 if (fd < 0) {
143 free(new);
144 return error("git checkout-index: unable to create file %s (%s)",
145 path, strerror(errno));
146 }
147 wrote = write_in_full(fd, new, size);
149 /* use fstat() only when path == ce->name */
150 if (fstat_is_reliable() &&
151 state->refresh_cache && !to_tempfile && !state->base_dir_len) {
152 fstat(fd, &st);
153 fstat_done = 1;
154 }
155 close(fd);
156 free(new);
157 if (wrote != size)
158 return error("git checkout-index: unable to write file %s", path);
159 break;
160 case S_IFGITLINK:
161 if (to_tempfile)
162 return error("git checkout-index: cannot create temporary subproject %s", path);
163 if (mkdir(path, 0777) < 0)
164 return error("git checkout-index: cannot create subproject directory %s", path);
165 break;
166 default:
167 return error("git checkout-index: unknown file mode for %s", path);
168 }
169 if (state->refresh_cache) {
171 if (!fstat_done)
172 lstat(ce->name, &st);
173 fill_stat_cache_info(ce, &st);
174 }
175 return 0;
176}
177/*
179 * This is like 'lstat()', except it refuses to follow symlinks
180 * in the path.
181 */
182int check_path(const char *path, int len, struct stat *st)
183{
184 if (has_symlink_leading_path(path, len)) {
185 errno = ENOENT;
186 return -1;
187 }
188 return lstat(path, st);
189}
190int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
192{
193 static char path[PATH_MAX + 1];
194 struct stat st;
195 int len = state->base_dir_len;
196 if (topath)
198 return write_entry(ce, topath, state, 1);
199 memcpy(path, state->base_dir, len);
201 strcpy(path + len, ce->name);
202 len += ce_namelen(ce);
203 if (!check_path(path, len, &st)) {
205 unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
206 if (!changed)
207 return 0;
208 if (!state->force) {
209 if (!state->quiet)
210 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
211 return -1;
212 }
213 /*
215 * We unlink the old file, to get the new one with the
216 * right permissions (including umask, which is nasty
217 * to emulate by hand - much easier to let the system
218 * just do the right thing)
219 */
220 if (S_ISDIR(st.st_mode)) {
221 /* If it is a gitlink, leave it alone! */
222 if (S_ISGITLINK(ce->ce_mode))
223 return 0;
224 if (!state->force)
225 return error("%s is a directory", path);
226 remove_subtree(path);
227 } else if (unlink(path))
228 return error("unable to unlink old '%s' (%s)", path, strerror(errno));
229 } else if (state->not_new)
230 return 0;
231 create_directories(path, len, state);
232 return write_entry(ce, path, state, 0);
233}