Merge branch 'maint'
[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                 len = slash - path;
13                 memcpy(buf, path, len);
14                 buf[len] = 0;
15
16                 /*
17                  * For 'checkout-index --prefix=<dir>', <dir> is
18                  * allowed to be a symlink to an existing directory,
19                  * and we set 'state->base_dir_len' below, such that
20                  * we test the path components of the prefix with the
21                  * stat() function instead of the lstat() function.
22                  */
23                 if (has_dirs_only_path(len, buf, state->base_dir_len))
24                         continue; /* ok, it is already a directory. */
25
26                 /*
27                  * If this mkdir() would fail, it could be that there
28                  * is already a symlink or something else exists
29                  * there, therefore we then try to unlink it and try
30                  * one more time to create the directory.
31                  */
32                 if (mkdir(buf, 0777)) {
33                         if (errno == EEXIST && state->force &&
34                             !unlink(buf) && !mkdir(buf, 0777))
35                                 continue;
36                         die("cannot create directory at %s", buf);
37                 }
38         }
39         free(buf);
40 }
41
42 static void remove_subtree(const char *path)
43 {
44         DIR *dir = opendir(path);
45         struct dirent *de;
46         char pathbuf[PATH_MAX];
47         char *name;
48
49         if (!dir)
50                 die("cannot opendir %s (%s)", path, strerror(errno));
51         strcpy(pathbuf, path);
52         name = pathbuf + strlen(path);
53         *name++ = '/';
54         while ((de = readdir(dir)) != NULL) {
55                 struct stat st;
56                 if (is_dot_or_dotdot(de->d_name))
57                         continue;
58                 strcpy(name, de->d_name);
59                 if (lstat(pathbuf, &st))
60                         die("cannot lstat %s (%s)", pathbuf, strerror(errno));
61                 if (S_ISDIR(st.st_mode))
62                         remove_subtree(pathbuf);
63                 else if (unlink(pathbuf))
64                         die("cannot unlink %s (%s)", pathbuf, strerror(errno));
65         }
66         closedir(dir);
67         if (rmdir(path))
68                 die("cannot rmdir %s (%s)", path, strerror(errno));
69 }
70
71 static int create_file(const char *path, unsigned int mode)
72 {
73         mode = (mode & 0100) ? 0777 : 0666;
74         return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
75 }
76
77 static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
78 {
79         enum object_type type;
80         void *new = read_sha1_file(ce->sha1, &type, size);
81
82         if (new) {
83                 if (type == OBJ_BLOB)
84                         return new;
85                 free(new);
86         }
87         return NULL;
88 }
89
90 static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
91 {
92         int fd;
93         long wrote;
94
95         switch (ce->ce_mode & S_IFMT) {
96                 char *new;
97                 struct strbuf buf;
98                 unsigned long size;
99
100         case S_IFREG:
101                 new = read_blob_entry(ce, path, &size);
102                 if (!new)
103                         return error("git checkout-index: unable to read sha1 file of %s (%s)",
104                                 path, sha1_to_hex(ce->sha1));
105
106                 /*
107                  * Convert from git internal format to working tree format
108                  */
109                 strbuf_init(&buf, 0);
110                 if (convert_to_working_tree(ce->name, new, size, &buf)) {
111                         size_t newsize = 0;
112                         free(new);
113                         new = strbuf_detach(&buf, &newsize);
114                         size = newsize;
115                 }
116
117                 if (to_tempfile) {
118                         strcpy(path, ".merge_file_XXXXXX");
119                         fd = mkstemp(path);
120                 } else
121                         fd = create_file(path, ce->ce_mode);
122                 if (fd < 0) {
123                         free(new);
124                         return error("git checkout-index: unable to create file %s (%s)",
125                                 path, strerror(errno));
126                 }
127
128                 wrote = write_in_full(fd, new, size);
129                 close(fd);
130                 free(new);
131                 if (wrote != size)
132                         return error("git checkout-index: unable to write file %s", path);
133                 break;
134         case S_IFLNK:
135                 new = read_blob_entry(ce, path, &size);
136                 if (!new)
137                         return error("git checkout-index: unable to read sha1 file of %s (%s)",
138                                 path, sha1_to_hex(ce->sha1));
139                 if (to_tempfile || !has_symlinks) {
140                         if (to_tempfile) {
141                                 strcpy(path, ".merge_link_XXXXXX");
142                                 fd = mkstemp(path);
143                         } else
144                                 fd = create_file(path, 0666);
145                         if (fd < 0) {
146                                 free(new);
147                                 return error("git checkout-index: unable to create "
148                                                  "file %s (%s)", path, strerror(errno));
149                         }
150                         wrote = write_in_full(fd, new, size);
151                         close(fd);
152                         free(new);
153                         if (wrote != size)
154                                 return error("git checkout-index: unable to write file %s",
155                                         path);
156                 } else {
157                         wrote = symlink(new, path);
158                         free(new);
159                         if (wrote)
160                                 return error("git checkout-index: unable to create "
161                                                  "symlink %s (%s)", path, strerror(errno));
162                 }
163                 break;
164         case S_IFGITLINK:
165                 if (to_tempfile)
166                         return error("git checkout-index: cannot create temporary subproject %s", path);
167                 if (mkdir(path, 0777) < 0)
168                         return error("git checkout-index: cannot create subproject directory %s", path);
169                 break;
170         default:
171                 return error("git checkout-index: unknown file mode for %s", path);
172         }
173
174         if (state->refresh_cache) {
175                 struct stat st;
176                 lstat(ce->name, &st);
177                 fill_stat_cache_info(ce, &st);
178         }
179         return 0;
180 }
181
182 int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
183 {
184         static char path[PATH_MAX + 1];
185         struct stat st;
186         int len = state->base_dir_len;
187
188         if (topath)
189                 return write_entry(ce, topath, state, 1);
190
191         memcpy(path, state->base_dir, len);
192         strcpy(path + len, ce->name);
193
194         if (!lstat(path, &st)) {
195                 unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
196                 if (!changed)
197                         return 0;
198                 if (!state->force) {
199                         if (!state->quiet)
200                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
201                         return -1;
202                 }
203
204                 /*
205                  * We unlink the old file, to get the new one with the
206                  * right permissions (including umask, which is nasty
207                  * to emulate by hand - much easier to let the system
208                  * just do the right thing)
209                  */
210                 if (S_ISDIR(st.st_mode)) {
211                         /* If it is a gitlink, leave it alone! */
212                         if (S_ISGITLINK(ce->ce_mode))
213                                 return 0;
214                         if (!state->force)
215                                 return error("%s is a directory", path);
216                         remove_subtree(path);
217                 } else if (unlink(path))
218                         return error("unable to unlink old '%s' (%s)", path, strerror(errno));
219         } else if (state->not_new)
220                 return 0;
221         create_directories(path, state);
222         return write_entry(ce, path, state, 0);
223 }