Use gunzip -c over gzcat in import-tars example.
[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                 /* FIXME: LF -> CRLF conversion goes here, based on "ce->name" */
93                 wrote = write_in_full(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_in_full(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[PATH_MAX + 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 }