Merge branch 'lt/gitlink'
[git/git.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 void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
66 {
67 enum object_type type;
68 void *new = read_sha1_file(ce->sha1, &type, size);
69
70 if (new) {
71 if (type == OBJ_BLOB)
72 return new;
73 free(new);
74 }
75 return NULL;
76 }
77
78 static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
79 {
80 int fd;
81 long wrote;
82
83 switch (ntohl(ce->ce_mode) & S_IFMT) {
84 char *buf, *new;
85 unsigned long size, nsize;
86
87 case S_IFREG:
88 new = read_blob_entry(ce, path, &size);
89 if (!new)
90 return error("git-checkout-index: unable to read sha1 file of %s (%s)",
91 path, sha1_to_hex(ce->sha1));
92 if (to_tempfile) {
93 strcpy(path, ".merge_file_XXXXXX");
94 fd = mkstemp(path);
95 } else
96 fd = create_file(path, ntohl(ce->ce_mode));
97 if (fd < 0) {
98 free(new);
99 return error("git-checkout-index: unable to create file %s (%s)",
100 path, strerror(errno));
101 }
102
103 /*
104 * Convert from git internal format to working tree format
105 */
106 buf = new;
107 nsize = size;
108 if (convert_to_working_tree(ce->name, &buf, &nsize)) {
109 free(new);
110 new = buf;
111 size = nsize;
112 }
113
114 wrote = write_in_full(fd, new, size);
115 close(fd);
116 free(new);
117 if (wrote != size)
118 return error("git-checkout-index: unable to write file %s", path);
119 break;
120 case S_IFLNK:
121 new = read_blob_entry(ce, path, &size);
122 if (!new)
123 return error("git-checkout-index: unable to read sha1 file of %s (%s)",
124 path, sha1_to_hex(ce->sha1));
125 if (to_tempfile || !has_symlinks) {
126 if (to_tempfile) {
127 strcpy(path, ".merge_link_XXXXXX");
128 fd = mkstemp(path);
129 } else
130 fd = create_file(path, 0666);
131 if (fd < 0) {
132 free(new);
133 return error("git-checkout-index: unable to create "
134 "file %s (%s)", path, strerror(errno));
135 }
136 wrote = write_in_full(fd, new, size);
137 close(fd);
138 free(new);
139 if (wrote != size)
140 return error("git-checkout-index: unable to write file %s",
141 path);
142 } else {
143 wrote = symlink(new, path);
144 free(new);
145 if (wrote)
146 return error("git-checkout-index: unable to create "
147 "symlink %s (%s)", path, strerror(errno));
148 }
149 break;
150 case S_IFDIRLNK:
151 if (to_tempfile)
152 return error("git-checkout-index: cannot create temporary subproject %s", path);
153 if (mkdir(path, 0777) < 0)
154 return error("git-checkout-index: cannot create subproject directory %s", path);
155 break;
156 default:
157 return error("git-checkout-index: unknown file mode for %s", path);
158 }
159
160 if (state->refresh_cache) {
161 struct stat st;
162 lstat(ce->name, &st);
163 fill_stat_cache_info(ce, &st);
164 }
165 return 0;
166 }
167
168 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
169 {
170 static char path[PATH_MAX + 1];
171 struct stat st;
172 int len = state->base_dir_len;
173
174 if (topath)
175 return write_entry(ce, topath, state, 1);
176
177 memcpy(path, state->base_dir, len);
178 strcpy(path + len, ce->name);
179
180 if (!lstat(path, &st)) {
181 unsigned changed = ce_match_stat(ce, &st, 1);
182 if (!changed)
183 return 0;
184 if (!state->force) {
185 if (!state->quiet)
186 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
187 return -1;
188 }
189
190 /*
191 * We unlink the old file, to get the new one with the
192 * right permissions (including umask, which is nasty
193 * to emulate by hand - much easier to let the system
194 * just do the right thing)
195 */
196 unlink(path);
197 if (S_ISDIR(st.st_mode)) {
198 /* If it is a gitlink, leave it alone! */
199 if (S_ISDIRLNK(ntohl(ce->ce_mode)))
200 return 0;
201 if (!state->force)
202 return error("%s is a directory", path);
203 remove_subtree(path);
204 }
205 } else if (state->not_new)
206 return 0;
207 create_directories(path, state);
208 return write_entry(ce, path, state, 0);
209 }