git-svn: fix log with single revision against a non-HEAD branch
[git/dscho.git] / entry.c
blobfc3a506ecef4ed654f26c11996df109dd135a4ed
1 #include "cache.h"
2 #include "blob.h"
4 static void create_directories(const char *path, const struct checkout *state)
6         int len = strlen(path);
7         char *buf = xmalloc(len + 1);
8         const char *slash = path;
10         while ((slash = strchr(slash+1, '/')) != NULL) {
11                 struct stat st;
12                 int stat_status;
14                 len = slash - path;
15                 memcpy(buf, path, len);
16                 buf[len] = 0;
18                 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);
32                 if (!stat_status && S_ISDIR(st.st_mode))
33                         continue; /* ok, it is already a directory. */
35                 /*
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);
51 static void remove_subtree(const char *path)
53         DIR *dir = opendir(path);
54         struct dirent *de;
55         char pathbuf[PATH_MAX];
56         char *name;
58         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));
82 static int create_file(const char *path, unsigned int mode)
84         mode = (mode & 0100) ? 0777 : 0666;
85         return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
88 static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
90         enum object_type type;
91         void *new = read_sha1_file(ce->sha1, &type, size);
93         if (new) {
94                 if (type == OBJ_BLOB)
95                         return new;
96                 free(new);
97         }
98         return NULL;
101 static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
103         int fd;
104         long wrote;
106         switch (ntohl(ce->ce_mode) & S_IFMT) {
107                 char *buf, *new;
108                 unsigned long size;
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));
116                 /*
117                  * Convert from git internal format to working tree format
118                  */
119                 buf = convert_to_working_tree(ce->name, new, &size);
120                 if (buf) {
121                         free(new);
122                         new = buf;
123                 }
125                 if (to_tempfile) {
126                         strcpy(path, ".merge_file_XXXXXX");
127                         fd = mkstemp(path);
128                 } else
129                         fd = create_file(path, ntohl(ce->ce_mode));
130                 if (fd < 0) {
131                         free(new);
132                         return error("git-checkout-index: unable to create file %s (%s)",
133                                 path, strerror(errno));
134                 }
136                 wrote = write_in_full(fd, new, size);
137                 close(fd);
138                 free(new);
139                 if (wrote != size)
140                         return error("git-checkout-index: unable to write file %s", path);
141                 break;
142         case S_IFLNK:
143                 new = read_blob_entry(ce, path, &size);
144                 if (!new)
145                         return error("git-checkout-index: unable to read sha1 file of %s (%s)",
146                                 path, sha1_to_hex(ce->sha1));
147                 if (to_tempfile || !has_symlinks) {
148                         if (to_tempfile) {
149                                 strcpy(path, ".merge_link_XXXXXX");
150                                 fd = mkstemp(path);
151                         } else
152                                 fd = create_file(path, 0666);
153                         if (fd < 0) {
154                                 free(new);
155                                 return error("git-checkout-index: unable to create "
156                                                  "file %s (%s)", path, strerror(errno));
157                         }
158                         wrote = write_in_full(fd, new, size);
159                         close(fd);
160                         free(new);
161                         if (wrote != size)
162                                 return error("git-checkout-index: unable to write file %s",
163                                         path);
164                 } else {
165                         wrote = symlink(new, path);
166                         free(new);
167                         if (wrote)
168                                 return error("git-checkout-index: unable to create "
169                                                  "symlink %s (%s)", path, strerror(errno));
170                 }
171                 break;
172         case S_IFGITLINK:
173                 if (to_tempfile)
174                         return error("git-checkout-index: cannot create temporary subproject %s", path);
175                 if (mkdir(path, 0777) < 0)
176                         return error("git-checkout-index: cannot create subproject directory %s", path);
177                 break;
178         default:
179                 return error("git-checkout-index: unknown file mode for %s", path);
180         }
182         if (state->refresh_cache) {
183                 struct stat st;
184                 lstat(ce->name, &st);
185                 fill_stat_cache_info(ce, &st);
186         }
187         return 0;
190 int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
192         static char path[PATH_MAX + 1];
193         struct stat st;
194         int len = state->base_dir_len;
196         if (topath)
197                 return write_entry(ce, topath, state, 1);
199         memcpy(path, state->base_dir, len);
200         strcpy(path + len, ce->name);
202         if (!lstat(path, &st)) {
203                 unsigned changed = ce_match_stat(ce, &st, 1);
204                 if (!changed)
205                         return 0;
206                 if (!state->force) {
207                         if (!state->quiet)
208                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
209                         return -1;
210                 }
212                 /*
213                  * We unlink the old file, to get the new one with the
214                  * right permissions (including umask, which is nasty
215                  * to emulate by hand - much easier to let the system
216                  * just do the right thing)
217                  */
218                 unlink(path);
219                 if (S_ISDIR(st.st_mode)) {
220                         /* If it is a gitlink, leave it alone! */
221                         if (S_ISGITLINK(ntohl(ce->ce_mode)))
222                                 return 0;
223                         if (!state->force)
224                                 return error("%s is a directory", path);
225                         remove_subtree(path);
226                 }
227         } else if (state->not_new)
228                 return 0;
229         create_directories(path, state);
230         return write_entry(ce, path, state, 0);