Merge branch 'maint'
[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;
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 = convert_to_working_tree(ce->name, new, &size);
107                 if (buf) {
108                         free(new);
109                         new = buf;
110                 }
111
112                 wrote = write_in_full(fd, new, size);
113                 close(fd);
114                 free(new);
115                 if (wrote != size)
116                         return error("git-checkout-index: unable to write file %s", path);
117                 break;
118         case S_IFLNK:
119                 new = read_blob_entry(ce, path, &size);
120                 if (!new)
121                         return error("git-checkout-index: unable to read sha1 file of %s (%s)",
122                                 path, sha1_to_hex(ce->sha1));
123                 if (to_tempfile || !has_symlinks) {
124                         if (to_tempfile) {
125                                 strcpy(path, ".merge_link_XXXXXX");
126                                 fd = mkstemp(path);
127                         } else
128                                 fd = create_file(path, 0666);
129                         if (fd < 0) {
130                                 free(new);
131                                 return error("git-checkout-index: unable to create "
132                                                  "file %s (%s)", path, strerror(errno));
133                         }
134                         wrote = write_in_full(fd, new, size);
135                         close(fd);
136                         free(new);
137                         if (wrote != size)
138                                 return error("git-checkout-index: unable to write file %s",
139                                         path);
140                 } else {
141                         wrote = symlink(new, path);
142                         free(new);
143                         if (wrote)
144                                 return error("git-checkout-index: unable to create "
145                                                  "symlink %s (%s)", path, strerror(errno));
146                 }
147                 break;
148         case S_IFDIRLNK:
149                 if (to_tempfile)
150                         return error("git-checkout-index: cannot create temporary subproject %s", path);
151                 if (mkdir(path, 0777) < 0)
152                         return error("git-checkout-index: cannot create subproject directory %s", path);
153                 break;
154         default:
155                 return error("git-checkout-index: unknown file mode for %s", path);
156         }
157
158         if (state->refresh_cache) {
159                 struct stat st;
160                 lstat(ce->name, &st);
161                 fill_stat_cache_info(ce, &st);
162         }
163         return 0;
164 }
165
166 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
167 {
168         static char path[PATH_MAX + 1];
169         struct stat st;
170         int len = state->base_dir_len;
171
172         if (topath)
173                 return write_entry(ce, topath, state, 1);
174
175         memcpy(path, state->base_dir, len);
176         strcpy(path + len, ce->name);
177
178         if (!lstat(path, &st)) {
179                 unsigned changed = ce_match_stat(ce, &st, 1);
180                 if (!changed)
181                         return 0;
182                 if (!state->force) {
183                         if (!state->quiet)
184                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
185                         return -1;
186                 }
187
188                 /*
189                  * We unlink the old file, to get the new one with the
190                  * right permissions (including umask, which is nasty
191                  * to emulate by hand - much easier to let the system
192                  * just do the right thing)
193                  */
194                 unlink(path);
195                 if (S_ISDIR(st.st_mode)) {
196                         /* If it is a gitlink, leave it alone! */
197                         if (S_ISDIRLNK(ntohl(ce->ce_mode)))
198                                 return 0;
199                         if (!state->force)
200                                 return error("%s is a directory", path);
201                         remove_subtree(path);
202                 }
203         } else if (state->not_new)
204                 return 0;
205         create_directories(path, state);
206         return write_entry(ce, path, state, 0);
207 }