1#include "cache.h"
2#include "blob.h"
3static void create_directories(const char *path, const struct checkout *state)
5{
6 int len = strlen(path);
7 char *buf = xmalloc(len + 1);
8 const char *slash = path;
9 while ((slash = strchr(slash+1, '/')) != NULL) {
11 struct stat st;
12 int stat_status;
13 len = slash - path;
15 memcpy(buf, path, len);
16 buf[len] = 0;
17 if (len <= state->base_dir_len)
19 /*
20 * checkout-index --prefix=<dir>; <dir> is
21 * allowed to be a symlink to an existing
22 * directory.
23 */
24 stat_status = stat(buf, &st);
25 else
26 /*
27 * if there currently is a symlink, we would
28 * want to replace it with a real directory.
29 */
30 stat_status = lstat(buf, &st);
31 if (!stat_status && S_ISDIR(st.st_mode))
33 continue; /* ok, it is already a directory. */
34 /*
36 * We know stat_status == 0 means something exists
37 * there and this mkdir would fail, but that is an
38 * error codepath; we do not care, as we unlink and
39 * mkdir again in such a case.
40 */
41 if (mkdir(buf, 0777)) {
42 if (errno == EEXIST && state->force &&
43 !unlink(buf) && !mkdir(buf, 0777))
44 continue;
45 die("cannot create directory at %s", buf);
46 }
47 }
48 free(buf);
49}
50static void remove_subtree(const char *path)
52{
53 DIR *dir = opendir(path);
54 struct dirent *de;
55 char pathbuf[PATH_MAX];
56 char *name;
57 if (!dir)
59 die("cannot opendir %s (%s)", path, strerror(errno));
60 strcpy(pathbuf, path);
61 name = pathbuf + strlen(path);
62 *name++ = '/';
63 while ((de = readdir(dir)) != NULL) {
64 struct stat st;
65 if ((de->d_name[0] == '.') &&
66 ((de->d_name[1] == 0) ||
67 ((de->d_name[1] == '.') && de->d_name[2] == 0)))
68 continue;
69 strcpy(name, de->d_name);
70 if (lstat(pathbuf, &st))
71 die("cannot lstat %s (%s)", pathbuf, strerror(errno));
72 if (S_ISDIR(st.st_mode))
73 remove_subtree(pathbuf);
74 else if (unlink(pathbuf))
75 die("cannot unlink %s (%s)", pathbuf, strerror(errno));
76 }
77 closedir(dir);
78 if (rmdir(path))
79 die("cannot rmdir %s (%s)", path, strerror(errno));
80}
81static int create_file(const char *path, unsigned int mode)
83{
84 mode = (mode & 0100) ? 0777 : 0666;
85 return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
86}
87static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
89{
90 enum object_type type;
91 void *new = read_sha1_file(ce->sha1, &type, size);
92 if (new) {
94 if (type == OBJ_BLOB)
95 return new;
96 free(new);
97 }
98 return NULL;
99}
100static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
102{
103 int fd;
104 long wrote;
105 switch (ce->ce_mode & S_IFMT) {
107 char *new;
108 struct strbuf buf;
109 unsigned long size;
110 case S_IFREG:
112 new = read_blob_entry(ce, path, &size);
113 if (!new)
114 return error("git checkout-index: unable to read sha1 file of %s (%s)",
115 path, sha1_to_hex(ce->sha1));
116 /*
118 * Convert from git internal format to working tree format
119 */
120 strbuf_init(&buf, 0);
121 if (convert_to_working_tree(ce->name, new, size, &buf)) {
122 size_t newsize = 0;
123 free(new);
124 new = strbuf_detach(&buf, &newsize);
125 size = newsize;
126 }
127 if (to_tempfile) {
129 strcpy(path, ".merge_file_XXXXXX");
130 fd = mkstemp(path);
131 } else
132 fd = create_file(path, ce->ce_mode);
133 if (fd < 0) {
134 free(new);
135 return error("git checkout-index: unable to create file %s (%s)",
136 path, strerror(errno));
137 }
138 wrote = write_in_full(fd, new, size);
140 close(fd);
141 free(new);
142 if (wrote != size)
143 return error("git checkout-index: unable to write file %s", path);
144 break;
145 case S_IFLNK:
146 new = read_blob_entry(ce, path, &size);
147 if (!new)
148 return error("git checkout-index: unable to read sha1 file of %s (%s)",
149 path, sha1_to_hex(ce->sha1));
150 if (to_tempfile || !has_symlinks) {
151 if (to_tempfile) {
152 strcpy(path, ".merge_link_XXXXXX");
153 fd = mkstemp(path);
154 } else
155 fd = create_file(path, 0666);
156 if (fd < 0) {
157 free(new);
158 return error("git checkout-index: unable to create "
159 "file %s (%s)", path, strerror(errno));
160 }
161 wrote = write_in_full(fd, new, size);
162 close(fd);
163 free(new);
164 if (wrote != size)
165 return error("git checkout-index: unable to write file %s",
166 path);
167 } else {
168 wrote = symlink(new, path);
169 free(new);
170 if (wrote)
171 return error("git checkout-index: unable to create "
172 "symlink %s (%s)", path, strerror(errno));
173 }
174 break;
175 case S_IFGITLINK:
176 if (to_tempfile)
177 return error("git checkout-index: cannot create temporary subproject %s", path);
178 if (mkdir(path, 0777) < 0)
179 return error("git checkout-index: cannot create subproject directory %s", path);
180 break;
181 default:
182 return error("git checkout-index: unknown file mode for %s", path);
183 }
184 if (state->refresh_cache) {
186 struct stat st;
187 lstat(ce->name, &st);
188 fill_stat_cache_info(ce, &st);
189 }
190 return 0;
191}
192int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
194{
195 static char path[PATH_MAX + 1];
196 struct stat st;
197 int len = state->base_dir_len;
198 if (topath)
200 return write_entry(ce, topath, state, 1);
201 memcpy(path, state->base_dir, len);
203 strcpy(path + len, ce->name);
204 if (!lstat(path, &st)) {
206 unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
207 if (!changed)
208 return 0;
209 if (!state->force) {
210 if (!state->quiet)
211 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
212 return -1;
213 }
214 /*
216 * We unlink the old file, to get the new one with the
217 * right permissions (including umask, which is nasty
218 * to emulate by hand - much easier to let the system
219 * just do the right thing)
220 */
221 if (S_ISDIR(st.st_mode)) {
222 /* If it is a gitlink, leave it alone! */
223 if (S_ISGITLINK(ce->ce_mode))
224 return 0;
225 if (!state->force)
226 return error("%s is a directory", path);
227 remove_subtree(path);
228 } else if (unlink(path))
229 return error("unable to unlink old '%s' (%s)", path, strerror(errno));
230 } else if (state->not_new)
231 return 0;
232 create_directories(path, state);
233 return write_entry(ce, path, state, 0);
234}