git-fetch: Reset shallow_depth before auto-following tags.
[git] / entry.c
1 #include <sys/types.h>
2 #include <dirent.h>
3 #include "cache.h"
4 #include "blob.h"
5
6 static void create_directories(const char *path, struct checkout *state)
7 {
8         int len = strlen(path);
9         char *buf = xmalloc(len + 1);
10         const char *slash = path;
11
12         while ((slash = strchr(slash+1, '/')) != NULL) {
13                 len = slash - path;
14                 memcpy(buf, path, len);
15                 buf[len] = 0;
16                 if (mkdir(buf, 0777)) {
17                         if (errno == EEXIST) {
18                                 struct stat st;
19                                 if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0777))
20                                         continue;
21                                 if (!stat(buf, &st) && S_ISDIR(st.st_mode))
22                                         continue; /* ok */
23                         }
24                         die("cannot create directory at %s", buf);
25                 }
26         }
27         free(buf);
28 }
29
30 static void remove_subtree(const char *path)
31 {
32         DIR *dir = opendir(path);
33         struct dirent *de;
34         char pathbuf[PATH_MAX];
35         char *name;
36         
37         if (!dir)
38                 die("cannot opendir %s", path);
39         strcpy(pathbuf, path);
40         name = pathbuf + strlen(path);
41         *name++ = '/';
42         while ((de = readdir(dir)) != NULL) {
43                 struct stat st;
44                 if ((de->d_name[0] == '.') &&
45                     ((de->d_name[1] == 0) ||
46                      ((de->d_name[1] == '.') && de->d_name[2] == 0)))
47                         continue;
48                 strcpy(name, de->d_name);
49                 if (lstat(pathbuf, &st))
50                         die("cannot lstat %s", pathbuf);
51                 if (S_ISDIR(st.st_mode))
52                         remove_subtree(pathbuf);
53                 else if (unlink(pathbuf))
54                         die("cannot unlink %s", pathbuf);
55         }
56         closedir(dir);
57         if (rmdir(path))
58                 die("cannot rmdir %s", path);
59 }
60
61 static int create_file(const char *path, unsigned int mode)
62 {
63         mode = (mode & 0100) ? 0777 : 0666;
64         return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
65 }
66
67 static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
68 {
69         int fd;
70         void *new;
71         unsigned long size;
72         long wrote;
73         char type[20];
74
75         new = read_sha1_file(ce->sha1, type, &size);
76         if (!new || strcmp(type, blob_type)) {
77                 if (new)
78                         free(new);
79                 return error("git-checkout-index: unable to read sha1 file of %s (%s)",
80                         path, sha1_to_hex(ce->sha1));
81         }
82         switch (ntohl(ce->ce_mode) & S_IFMT) {
83         case S_IFREG:
84                 if (to_tempfile) {
85                         strcpy(path, ".merge_file_XXXXXX");
86                         fd = mkstemp(path);
87                 } else
88                         fd = create_file(path, ntohl(ce->ce_mode));
89                 if (fd < 0) {
90                         free(new);
91                         return error("git-checkout-index: unable to create file %s (%s)",
92                                 path, strerror(errno));
93                 }
94                 wrote = write(fd, new, size);
95                 close(fd);
96                 free(new);
97                 if (wrote != size)
98                         return error("git-checkout-index: unable to write file %s", path);
99                 break;
100         case S_IFLNK:
101                 if (to_tempfile) {
102                         strcpy(path, ".merge_link_XXXXXX");
103                         fd = mkstemp(path);
104                         if (fd < 0) {
105                                 free(new);
106                                 return error("git-checkout-index: unable to create "
107                                                  "file %s (%s)", path, strerror(errno));
108                         }
109                         wrote = write(fd, new, size);
110                         close(fd);
111                         free(new);
112                         if (wrote != size)
113                                 return error("git-checkout-index: unable to write file %s",
114                                         path);
115                 } else {
116                         wrote = symlink(new, path);
117                         free(new);
118                         if (wrote)
119                                 return error("git-checkout-index: unable to create "
120                                                  "symlink %s (%s)", path, strerror(errno));
121                 }
122                 break;
123         default:
124                 free(new);
125                 return error("git-checkout-index: unknown file mode for %s", path);
126         }
127
128         if (state->refresh_cache) {
129                 struct stat st;
130                 lstat(ce->name, &st);
131                 fill_stat_cache_info(ce, &st);
132         }
133         return 0;
134 }
135
136 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
137 {
138         static char path[PATH_MAX + 1];
139         struct stat st;
140         int len = state->base_dir_len;
141
142         if (topath)
143                 return write_entry(ce, topath, state, 1);
144
145         memcpy(path, state->base_dir, len);
146         strcpy(path + len, ce->name);
147
148         if (!lstat(path, &st)) {
149                 unsigned changed = ce_match_stat(ce, &st, 1);
150                 if (!changed)
151                         return 0;
152                 if (!state->force) {
153                         if (!state->quiet)
154                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
155                         return -1;
156                 }
157
158                 /*
159                  * We unlink the old file, to get the new one with the
160                  * right permissions (including umask, which is nasty
161                  * to emulate by hand - much easier to let the system
162                  * just do the right thing)
163                  */
164                 unlink(path);
165                 if (S_ISDIR(st.st_mode)) {
166                         if (!state->force)
167                                 return error("%s is a directory", path);
168                         remove_subtree(path);
169                 }
170         } else if (state->not_new)
171                 return 0;
172         create_directories(path, state);
173         return write_entry(ce, path, state, 0);
174 }