Merge branch 'lt/gitlink'
[git] / entry.c
1 #include "cache.h"
2 #include "blob.h"
3
4 static void create_directories(const char *path, struct checkout *state)
5 {
6         int len = strlen(path);
7         char *buf = xmalloc(len + 1);
8         const char *slash = path;
9
10         while ((slash = strchr(slash+1, '/')) != NULL) {
11                 len = slash - path;
12                 memcpy(buf, path, len);
13                 buf[len] = 0;
14                 if (mkdir(buf, 0777)) {
15                         if (errno == EEXIST) {
16                                 struct stat st;
17                                 if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0777))
18                                         continue;
19                                 if (!stat(buf, &st) && S_ISDIR(st.st_mode))
20                                         continue; /* ok */
21                         }
22                         die("cannot create directory at %s", buf);
23                 }
24         }
25         free(buf);
26 }
27
28 static void remove_subtree(const char *path)
29 {
30         DIR *dir = opendir(path);
31         struct dirent *de;
32         char pathbuf[PATH_MAX];
33         char *name;
34         
35         if (!dir)
36                 die("cannot opendir %s", path);
37         strcpy(pathbuf, path);
38         name = pathbuf + strlen(path);
39         *name++ = '/';
40         while ((de = readdir(dir)) != NULL) {
41                 struct stat st;
42                 if ((de->d_name[0] == '.') &&
43                     ((de->d_name[1] == 0) ||
44                      ((de->d_name[1] == '.') && de->d_name[2] == 0)))
45                         continue;
46                 strcpy(name, de->d_name);
47                 if (lstat(pathbuf, &st))
48                         die("cannot lstat %s", pathbuf);
49                 if (S_ISDIR(st.st_mode))
50                         remove_subtree(pathbuf);
51                 else if (unlink(pathbuf))
52                         die("cannot unlink %s", pathbuf);
53         }
54         closedir(dir);
55         if (rmdir(path))
56                 die("cannot rmdir %s", path);
57 }
58
59 static int create_file(const char *path, unsigned int mode)
60 {
61         mode = (mode & 0100) ? 0777 : 0666;
62         return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
63 }
64
65 static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
66 {
67         enum object_type type;
68         void *new = read_sha1_file(ce->sha1, &type, size);
69
70         if (new) {
71                 if (type == OBJ_BLOB)
72                         return new;
73                 free(new);
74         }
75         return NULL;
76 }
77
78 static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
79 {
80         int fd;
81         long wrote;
82
83         switch (ntohl(ce->ce_mode) & S_IFMT) {
84                 char *buf, *new;
85                 unsigned long size, nsize;
86
87         case S_IFREG:
88                 new = read_blob_entry(ce, path, &size);
89                 if (!new)
90                         return error("git-checkout-index: unable to read sha1 file of %s (%s)",
91                                 path, sha1_to_hex(ce->sha1));
92                 if (to_tempfile) {
93                         strcpy(path, ".merge_file_XXXXXX");
94                         fd = mkstemp(path);
95                 } else
96                         fd = create_file(path, ntohl(ce->ce_mode));
97                 if (fd < 0) {
98                         free(new);
99                         return error("git-checkout-index: unable to create file %s (%s)",
100                                 path, strerror(errno));
101                 }
102
103                 /*
104                  * Convert from git internal format to working tree format
105                  */
106                 buf = new;
107                 nsize = size;
108                 if (convert_to_working_tree(ce->name, &buf, &nsize)) {
109                         free(new);
110                         new = buf;
111                         size = nsize;
112                 }
113
114                 wrote = write_in_full(fd, new, size);
115                 close(fd);
116                 free(new);
117                 if (wrote != size)
118                         return error("git-checkout-index: unable to write file %s", path);
119                 break;
120         case S_IFLNK:
121                 new = read_blob_entry(ce, path, &size);
122                 if (!new)
123                         return error("git-checkout-index: unable to read sha1 file of %s (%s)",
124                                 path, sha1_to_hex(ce->sha1));
125                 if (to_tempfile || !has_symlinks) {
126                         if (to_tempfile) {
127                                 strcpy(path, ".merge_link_XXXXXX");
128                                 fd = mkstemp(path);
129                         } else
130                                 fd = create_file(path, 0666);
131                         if (fd < 0) {
132                                 free(new);
133                                 return error("git-checkout-index: unable to create "
134                                                  "file %s (%s)", path, strerror(errno));
135                         }
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",
141                                         path);
142                 } else {
143                         wrote = symlink(new, path);
144                         free(new);
145                         if (wrote)
146                                 return error("git-checkout-index: unable to create "
147                                                  "symlink %s (%s)", path, strerror(errno));
148                 }
149                 break;
150         case S_IFDIRLNK:
151                 if (to_tempfile)
152                         return error("git-checkout-index: cannot create temporary subproject %s", path);
153                 if (mkdir(path, 0777) < 0)
154                         return error("git-checkout-index: cannot create subproject directory %s", path);
155                 break;
156         default:
157                 return error("git-checkout-index: unknown file mode for %s", path);
158         }
159
160         if (state->refresh_cache) {
161                 struct stat st;
162                 lstat(ce->name, &st);
163                 fill_stat_cache_info(ce, &st);
164         }
165         return 0;
166 }
167
168 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
169 {
170         static char path[PATH_MAX + 1];
171         struct stat st;
172         int len = state->base_dir_len;
173
174         if (topath)
175                 return write_entry(ce, topath, state, 1);
176
177         memcpy(path, state->base_dir, len);
178         strcpy(path + len, ce->name);
179
180         if (!lstat(path, &st)) {
181                 unsigned changed = ce_match_stat(ce, &st, 1);
182                 if (!changed)
183                         return 0;
184                 if (!state->force) {
185                         if (!state->quiet)
186                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
187                         return -1;
188                 }
189
190                 /*
191                  * We unlink the old file, to get the new one with the
192                  * right permissions (including umask, which is nasty
193                  * to emulate by hand - much easier to let the system
194                  * just do the right thing)
195                  */
196                 unlink(path);
197                 if (S_ISDIR(st.st_mode)) {
198                         /* If it is a gitlink, leave it alone! */
199                         if (S_ISDIRLNK(ntohl(ce->ce_mode)))
200                                 return 0;
201                         if (!state->force)
202                                 return error("%s is a directory", path);
203                         remove_subtree(path);
204                 }
205         } else if (state->not_new)
206                 return 0;
207         create_directories(path, state);
208         return write_entry(ce, path, state, 0);
209 }