Merge branch 'ap/clone-into-empty'
[git] / entry.c
1 #include "cache.h"
2 #include "blob.h"
3 #include "dir.h"
4
5 static void create_directories(const char *path, const struct checkout *state)
6 {
7         int len = strlen(path);
8         char *buf = xmalloc(len + 1);
9         const char *slash = path;
10
11         while ((slash = strchr(slash+1, '/')) != NULL) {
12                 struct stat st;
13                 int stat_status;
14
15                 len = slash - path;
16                 memcpy(buf, path, len);
17                 buf[len] = 0;
18
19                 if (len <= state->base_dir_len)
20                         /*
21                          * checkout-index --prefix=<dir>; <dir> is
22                          * allowed to be a symlink to an existing
23                          * directory.
24                          */
25                         stat_status = stat(buf, &st);
26                 else
27                         /*
28                          * if there currently is a symlink, we would
29                          * want to replace it with a real directory.
30                          */
31                         stat_status = lstat(buf, &st);
32
33                 if (!stat_status && S_ISDIR(st.st_mode))
34                         continue; /* ok, it is already a directory. */
35
36                 /*
37                  * We know stat_status == 0 means something exists
38                  * there and this mkdir would fail, but that is an
39                  * error codepath; we do not care, as we unlink and
40                  * mkdir again in such a case.
41                  */
42                 if (mkdir(buf, 0777)) {
43                         if (errno == EEXIST && state->force &&
44                             !unlink(buf) && !mkdir(buf, 0777))
45                                 continue;
46                         die("cannot create directory at %s", buf);
47                 }
48         }
49         free(buf);
50 }
51
52 static void remove_subtree(const char *path)
53 {
54         DIR *dir = opendir(path);
55         struct dirent *de;
56         char pathbuf[PATH_MAX];
57         char *name;
58
59         if (!dir)
60                 die("cannot opendir %s (%s)", path, strerror(errno));
61         strcpy(pathbuf, path);
62         name = pathbuf + strlen(path);
63         *name++ = '/';
64         while ((de = readdir(dir)) != NULL) {
65                 struct stat st;
66                 if (is_dot_or_dotdot(de->d_name))
67                         continue;
68                 strcpy(name, de->d_name);
69                 if (lstat(pathbuf, &st))
70                         die("cannot lstat %s (%s)", pathbuf, strerror(errno));
71                 if (S_ISDIR(st.st_mode))
72                         remove_subtree(pathbuf);
73                 else if (unlink(pathbuf))
74                         die("cannot unlink %s (%s)", pathbuf, strerror(errno));
75         }
76         closedir(dir);
77         if (rmdir(path))
78                 die("cannot rmdir %s (%s)", path, strerror(errno));
79 }
80
81 static int create_file(const char *path, unsigned int mode)
82 {
83         mode = (mode & 0100) ? 0777 : 0666;
84         return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
85 }
86
87 static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
88 {
89         enum object_type type;
90         void *new = read_sha1_file(ce->sha1, &type, size);
91
92         if (new) {
93                 if (type == OBJ_BLOB)
94                         return new;
95                 free(new);
96         }
97         return NULL;
98 }
99
100 static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
101 {
102         int fd;
103         long wrote;
104
105         switch (ce->ce_mode & S_IFMT) {
106                 char *new;
107                 struct strbuf buf;
108                 unsigned long size;
109
110         case S_IFREG:
111                 new = read_blob_entry(ce, path, &size);
112                 if (!new)
113                         return error("git checkout-index: unable to read sha1 file of %s (%s)",
114                                 path, sha1_to_hex(ce->sha1));
115
116                 /*
117                  * Convert from git internal format to working tree format
118                  */
119                 strbuf_init(&buf, 0);
120                 if (convert_to_working_tree(ce->name, new, size, &buf)) {
121                         size_t newsize = 0;
122                         free(new);
123                         new = strbuf_detach(&buf, &newsize);
124                         size = newsize;
125                 }
126
127                 if (to_tempfile) {
128                         strcpy(path, ".merge_file_XXXXXX");
129                         fd = mkstemp(path);
130                 } else
131                         fd = create_file(path, ce->ce_mode);
132                 if (fd < 0) {
133                         free(new);
134                         return error("git checkout-index: unable to create file %s (%s)",
135                                 path, strerror(errno));
136                 }
137
138                 wrote = write_in_full(fd, new, size);
139                 close(fd);
140                 free(new);
141                 if (wrote != size)
142                         return error("git checkout-index: unable to write file %s", path);
143                 break;
144         case S_IFLNK:
145                 new = read_blob_entry(ce, path, &size);
146                 if (!new)
147                         return error("git checkout-index: unable to read sha1 file of %s (%s)",
148                                 path, sha1_to_hex(ce->sha1));
149                 if (to_tempfile || !has_symlinks) {
150                         if (to_tempfile) {
151                                 strcpy(path, ".merge_link_XXXXXX");
152                                 fd = mkstemp(path);
153                         } else
154                                 fd = create_file(path, 0666);
155                         if (fd < 0) {
156                                 free(new);
157                                 return error("git checkout-index: unable to create "
158                                                  "file %s (%s)", path, strerror(errno));
159                         }
160                         wrote = write_in_full(fd, new, size);
161                         close(fd);
162                         free(new);
163                         if (wrote != size)
164                                 return error("git checkout-index: unable to write file %s",
165                                         path);
166                 } else {
167                         wrote = symlink(new, path);
168                         free(new);
169                         if (wrote)
170                                 return error("git checkout-index: unable to create "
171                                                  "symlink %s (%s)", path, strerror(errno));
172                 }
173                 break;
174         case S_IFGITLINK:
175                 if (to_tempfile)
176                         return error("git checkout-index: cannot create temporary subproject %s", path);
177                 if (mkdir(path, 0777) < 0)
178                         return error("git checkout-index: cannot create subproject directory %s", path);
179                 break;
180         default:
181                 return error("git checkout-index: unknown file mode for %s", path);
182         }
183
184         if (state->refresh_cache) {
185                 struct stat st;
186                 lstat(ce->name, &st);
187                 fill_stat_cache_info(ce, &st);
188         }
189         return 0;
190 }
191
192 int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
193 {
194         static char path[PATH_MAX + 1];
195         struct stat st;
196         int len = state->base_dir_len;
197
198         if (topath)
199                 return write_entry(ce, topath, state, 1);
200
201         memcpy(path, state->base_dir, len);
202         strcpy(path + len, ce->name);
203
204         if (!lstat(path, &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
214                 /*
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, state);
232         return write_entry(ce, path, state, 0);
233 }