blame: Rename detection (take 2)
[git.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, char *path, struct checkout *state, int to_tempfile)
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                 if (to_tempfile) {
84                         strcpy(path, ".merge_file_XXXXXX");
85                         fd = mkstemp(path);
86                 } else
87                         fd = create_file(path, ntohl(ce->ce_mode));
88                 if (fd < 0) {
89                         free(new);
90                         return error("git-checkout-index: unable to create file %s (%s)",
91                                 path, strerror(errno));
92                 }
93                 wrote = write(fd, new, size);
94                 close(fd);
95                 free(new);
96                 if (wrote != size)
97                         return error("git-checkout-index: unable to write file %s", path);
98                 break;
99         case S_IFLNK:
100                 if (to_tempfile) {
101                         strcpy(path, ".merge_link_XXXXXX");
102                         fd = mkstemp(path);
103                         if (fd < 0) {
104                                 free(new);
105                                 return error("git-checkout-index: unable to create "
106                                                  "file %s (%s)", path, strerror(errno));
107                         }
108                         wrote = write(fd, new, size);
109                         close(fd);
110                         free(new);
111                         if (wrote != size)
112                                 return error("git-checkout-index: unable to write file %s",
113                                         path);
114                 } else {
115                         wrote = symlink(new, path);
116                         free(new);
117                         if (wrote)
118                                 return error("git-checkout-index: unable to create "
119                                                  "symlink %s (%s)", path, strerror(errno));
120                 }
121                 break;
122         default:
123                 free(new);
124                 return error("git-checkout-index: unknown file mode for %s", path);
125         }
126
127         if (state->refresh_cache) {
128                 struct stat st;
129                 lstat(ce->name, &st);
130                 fill_stat_cache_info(ce, &st);
131         }
132         return 0;
133 }
134
135 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
136 {
137         static char path[MAXPATHLEN+1];
138         struct stat st;
139         int len = state->base_dir_len;
140
141         if (topath)
142                 return write_entry(ce, topath, state, 1);
143
144         memcpy(path, state->base_dir, len);
145         strcpy(path + len, ce->name);
146
147         if (!lstat(path, &st)) {
148                 unsigned changed = ce_match_stat(ce, &st, 1);
149                 if (!changed)
150                         return 0;
151                 if (!state->force) {
152                         if (!state->quiet)
153                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
154                         return -1;
155                 }
156
157                 /*
158                  * We unlink the old file, to get the new one with the
159                  * right permissions (including umask, which is nasty
160                  * to emulate by hand - much easier to let the system
161                  * just do the right thing)
162                  */
163                 unlink(path);
164                 if (S_ISDIR(st.st_mode)) {
165                         if (!state->force)
166                                 return error("%s is a directory", path);
167                         remove_subtree(path);
168                 }
169         } else if (state->not_new)
170                 return 0;
171         create_directories(path, state);
172         return write_entry(ce, path, state, 0);
173 }
174
175