9d09c39ee0e0c941be9d606c28e1c0ee0540e4e8
1/*
2 * Check-out files from the "current cache directory"
3 *
4 * Copyright (C) 2005 Linus Torvalds
5 *
6 * Careful: order of argument flags does matter. For example,
7 *
8 * git-checkout-cache -a -f file.c
9 *
10 * Will first check out all files listed in the cache (but not
11 * overwrite any old ones), and then force-checkout "file.c" a
12 * second time (ie that one _will_ overwrite any old contents
13 * with the same filename).
14 *
15 * Also, just doing "git-checkout-cache" does nothing. You probably
16 * meant "git-checkout-cache -a". And if you want to force it, you
17 * want "git-checkout-cache -f -a".
18 *
19 * Intuitiveness is not the goal here. Repeatability is. The
20 * reason for the "no arguments means no work" thing is that
21 * from scripts you are supposed to be able to do things like
22 *
23 * find . -name '*.h' -print0 | xargs -0 git-checkout-cache -f --
24 *
25 * which will force all existing *.h files to be replaced with
26 * their cached copies. If an empty command line implied "all",
27 * then this would force-refresh everything in the cache, which
28 * was not the point.
29 *
30 * Oh, and the "--" is just a good idea when you know the rest
31 * will be filenames. Just so that you wouldn't have a filename
32 * of "-a" causing problems (not possible in the above example,
33 * but get used to it in scripting!).
34 */
35#include <sys/types.h>
36#include <dirent.h>
37#include "cache.h"
38static int force = 0, quiet = 0, not_new = 0, refresh_cache = 0;
40static const char *base_dir = "";
41static int base_dir_len = 0;
42static void create_directories(const char *path)
44{
45 int len = strlen(path);
46 char *buf = xmalloc(len + 1);
47 const char *slash = path;
48 while ((slash = strchr(slash+1, '/')) != NULL) {
50 len = slash - path;
51 memcpy(buf, path, len);
52 buf[len] = 0;
53 if (mkdir(buf, 0755)) {
54 if (errno == EEXIST) {
55 struct stat st;
56 if (len > base_dir_len && force && !unlink(buf) && !mkdir(buf, 0755))
57 continue;
58 if (!stat(buf, &st) && S_ISDIR(st.st_mode))
59 continue; /* ok */
60 }
61 die("cannot create directory at %s", buf);
62 }
63 }
64 free(buf);
65}
66static void remove_subtree(const char *path)
68{
69 DIR *dir = opendir(path);
70 struct dirent *de;
71 char pathbuf[PATH_MAX];
72 char *name;
73
74 if (!dir)
75 die("cannot opendir %s", path);
76 strcpy(pathbuf, path);
77 name = pathbuf + strlen(path);
78 *name++ = '/';
79 while ((de = readdir(dir)) != NULL) {
80 struct stat st;
81 if ((de->d_name[0] == '.') &&
82 ((de->d_name[1] == 0) ||
83 ((de->d_name[1] == '.') && de->d_name[2] == 0)))
84 continue;
85 strcpy(name, de->d_name);
86 if (lstat(pathbuf, &st))
87 die("cannot lstat %s", pathbuf);
88 if (S_ISDIR(st.st_mode))
89 remove_subtree(pathbuf);
90 else if (unlink(pathbuf))
91 die("cannot unlink %s", pathbuf);
92 }
93 closedir(dir);
94 if (rmdir(path))
95 die("cannot rmdir %s", path);
96}
97static int create_file(const char *path, unsigned int mode)
99{
100 int fd;
101 mode = (mode & 0100) ? 0777 : 0666;
103 create_directories(path);
104 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
105 if (fd < 0) {
106 if (errno == EISDIR && force) {
107 remove_subtree(path);
108 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
109 }
110 }
111 return fd;
112}
113static int write_entry(struct cache_entry *ce, const char *path)
115{
116 int fd;
117 void *new;
118 unsigned long size;
119 long wrote;
120 char type[20];
121 char target[1024];
122 new = read_sha1_file(ce->sha1, type, &size);
124 if (!new || strcmp(type, "blob")) {
125 if (new)
126 free(new);
127 return error("git-checkout-cache: unable to read sha1 file of %s (%s)",
128 path, sha1_to_hex(ce->sha1));
129 }
130 switch (ntohl(ce->ce_mode) & S_IFMT) {
131 case S_IFREG:
132 fd = create_file(path, ntohl(ce->ce_mode));
133 if (fd < 0) {
134 free(new);
135 return error("git-checkout-cache: unable to create file %s (%s)",
136 path, strerror(errno));
137 }
138 wrote = write(fd, new, size);
139 close(fd);
140 free(new);
141 if (wrote != size)
142 return error("git-checkout-cache: unable to write file %s", path);
143 break;
144 case S_IFLNK:
145 memcpy(target, new, size);
146 target[size] = '\0';
147 create_directories(path);
148 if (symlink(target, path)) {
149 free(new);
150 return error("git-checkout-cache: unable to create symlink %s (%s)",
151 path, strerror(errno));
152 }
153 free(new);
154 break;
155 default:
156 free(new);
157 return error("git-checkout-cache: unknown file mode for %s", path);
158 }
159 if (refresh_cache) {
161 struct stat st;
162 lstat(ce->name, &st);
163 fill_stat_cache_info(ce, &st);
164 }
165 return 0;
166}
167static int checkout_entry(struct cache_entry *ce)
169{
170 struct stat st;
171 static char path[MAXPATHLEN+1];
172 int len = base_dir_len;
173 memcpy(path, base_dir, len);
175 strcpy(path + len, ce->name);
176 if (!lstat(path, &st)) {
178 unsigned changed = ce_match_stat(ce, &st);
179 if (!changed)
180 return 0;
181 if (!force) {
182 if (!quiet)
183 fprintf(stderr, "git-checkout-cache: %s already exists\n", path);
184 return 0;
185 }
186 /*
188 * We unlink the old file, to get the new one with the
189 * right permissions (including umask, which is nasty
190 * to emulate by hand - much easier to let the system
191 * just do the right thing)
192 */
193 unlink(path);
194 } else if (not_new)
195 return 0;
196 return write_entry(ce, path);
197}
198static int checkout_file(const char *name)
200{
201 int pos = cache_name_pos(name, strlen(name));
202 if (pos < 0) {
203 if (!quiet) {
204 pos = -pos - 1;
205 fprintf(stderr,
206 "git-checkout-cache: %s is %s.\n",
207 name,
208 (pos < active_nr &&
209 !strcmp(active_cache[pos]->name, name)) ?
210 "unmerged" : "not in the cache");
211 }
212 return -1;
213 }
214 return checkout_entry(active_cache[pos]);
215}
216static int checkout_all(void)
218{
219 int i;
220 for (i = 0; i < active_nr ; i++) {
222 struct cache_entry *ce = active_cache[i];
223 if (ce_stage(ce))
224 continue;
225 if (checkout_entry(ce) < 0)
226 return -1;
227 }
228 return 0;
229}
230int main(int argc, char **argv)
232{
233 int i, force_filename = 0;
234 struct cache_file cache_file;
235 int newfd = -1;
236 if (read_cache() < 0) {
238 die("invalid cache");
239 }
240 for (i = 1; i < argc; i++) {
242 const char *arg = argv[i];
243 if (!force_filename) {
244 if (!strcmp(arg, "-a")) {
245 checkout_all();
246 continue;
247 }
248 if (!strcmp(arg, "--")) {
249 force_filename = 1;
250 continue;
251 }
252 if (!strcmp(arg, "-f")) {
253 force = 1;
254 continue;
255 }
256 if (!strcmp(arg, "-q")) {
257 quiet = 1;
258 continue;
259 }
260 if (!strcmp(arg, "-n")) {
261 not_new = 1;
262 continue;
263 }
264 if (!strcmp(arg, "-u")) {
265 refresh_cache = 1;
266 if (newfd < 0)
267 newfd = hold_index_file_for_update
268 (&cache_file,
269 get_index_file());
270 if (newfd < 0)
271 die("cannot open index.lock file.");
272 continue;
273 }
274 if (!memcmp(arg, "--prefix=", 9)) {
275 base_dir = arg+9;
276 base_dir_len = strlen(base_dir);
277 continue;
278 }
279 }
280 if (base_dir_len) {
281 /* when --prefix is specified we do not
282 * want to update cache.
283 */
284 if (refresh_cache) {
285 close(newfd); newfd = -1;
286 rollback_index_file(&cache_file);
287 }
288 refresh_cache = 0;
289 }
290 checkout_file(arg);
291 }
292 if (0 <= newfd &&
294 (write_cache(newfd, active_cache, active_nr) ||
295 commit_index_file(&cache_file)))
296 die("Unable to write new cachefile");
297 return 0;
298}