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