Refactor packed_git to prepare for sliding mmap windows.
[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 int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
66 {
67         int fd;
68         void *new;
69         unsigned long size;
70         long wrote;
71         char type[20];
72
73         new = read_sha1_file(ce->sha1, type, &size);
74         if (!new || strcmp(type, blob_type)) {
75                 if (new)
76                         free(new);
77                 return error("git-checkout-index: unable to read sha1 file of %s (%s)",
78                         path, sha1_to_hex(ce->sha1));
79         }
80         switch (ntohl(ce->ce_mode) & S_IFMT) {
81         case S_IFREG:
82                 if (to_tempfile) {
83                         strcpy(path, ".merge_file_XXXXXX");
84                         fd = mkstemp(path);
85                 } else
86                         fd = create_file(path, ntohl(ce->ce_mode));
87                 if (fd < 0) {
88                         free(new);
89                         return error("git-checkout-index: unable to create file %s (%s)",
90                                 path, strerror(errno));
91                 }
92                 wrote = write(fd, new, size);
93                 close(fd);
94                 free(new);
95                 if (wrote != size)
96                         return error("git-checkout-index: unable to write file %s", path);
97                 break;
98         case S_IFLNK:
99                 if (to_tempfile) {
100                         strcpy(path, ".merge_link_XXXXXX");
101                         fd = mkstemp(path);
102                         if (fd < 0) {
103                                 free(new);
104                                 return error("git-checkout-index: unable to create "
105                                                  "file %s (%s)", path, strerror(errno));
106                         }
107                         wrote = write(fd, new, size);
108                         close(fd);
109                         free(new);
110                         if (wrote != size)
111                                 return error("git-checkout-index: unable to write file %s",
112                                         path);
113                 } else {
114                         wrote = symlink(new, path);
115                         free(new);
116                         if (wrote)
117                                 return error("git-checkout-index: unable to create "
118                                                  "symlink %s (%s)", path, strerror(errno));
119                 }
120                 break;
121         default:
122                 free(new);
123                 return error("git-checkout-index: unknown file mode for %s", path);
124         }
125
126         if (state->refresh_cache) {
127                 struct stat st;
128                 lstat(ce->name, &st);
129                 fill_stat_cache_info(ce, &st);
130         }
131         return 0;
132 }
133
134 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
135 {
136         static char path[PATH_MAX + 1];
137         struct stat st;
138         int len = state->base_dir_len;
139
140         if (topath)
141                 return write_entry(ce, topath, state, 1);
142
143         memcpy(path, state->base_dir, len);
144         strcpy(path + len, ce->name);
145
146         if (!lstat(path, &st)) {
147                 unsigned changed = ce_match_stat(ce, &st, 1);
148                 if (!changed)
149                         return 0;
150                 if (!state->force) {
151                         if (!state->quiet)
152                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
153                         return -1;
154                 }
155
156                 /*
157                  * We unlink the old file, to get the new one with the
158                  * right permissions (including umask, which is nasty
159                  * to emulate by hand - much easier to let the system
160                  * just do the right thing)
161                  */
162                 unlink(path);
163                 if (S_ISDIR(st.st_mode)) {
164                         if (!state->force)
165                                 return error("%s is a directory", path);
166                         remove_subtree(path);
167                 }
168         } else if (state->not_new)
169                 return 0;
170         create_directories(path, state);
171         return write_entry(ce, path, state, 0);
172 }