2 * Check-out files from the "current cache directory"
4 * Copyright (C) 2005 Linus Torvalds
6 * Careful: order of argument flags does matter. For example,
8 * checkout-cache -a -f file.c
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).
15 * Also, just doing "checkout-cache" does nothing. You probably
16 * meant "checkout-cache -a". And if you want to force it, you
17 * want "checkout-cache -f -a".
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
23 * find . -name '*.h' -print0 | xargs -0 checkout-cache -f --
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
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!).
37 static int force = 0, quiet = 0, not_new = 0;
39 static void create_directories(const char *path)
41 int len = strlen(path);
42 char *buf = xmalloc(len + 1);
43 const char *slash = path;
45 while ((slash = strchr(slash+1, '/')) != NULL) {
47 memcpy(buf, path, len);
54 static int create_file(const char *path, unsigned int mode)
58 mode = (mode & 0100) ? 0777 : 0666;
59 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
61 if (errno == ENOENT) {
62 create_directories(path);
63 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
69 static int write_entry(struct cache_entry *ce, const char *path)
78 new = read_sha1_file(ce->sha1, type, &size);
79 if (!new || strcmp(type, "blob")) {
80 return error("checkout-cache: unable to read sha1 file of %s (%s)",
81 path, sha1_to_hex(ce->sha1));
83 switch (ntohl(ce->ce_mode) & S_IFMT) {
85 fd = create_file(path, ntohl(ce->ce_mode));
88 return error("checkout-cache: unable to create file %s (%s)",
89 path, strerror(errno));
91 wrote = write(fd, new, size);
95 return error("checkout-cache: unable to write file %s", path);
98 memcpy(target, new, size);
100 create_directories(path);
101 if (symlink(target, path)) {
103 return error("checkout-cache: unable to create symlink %s (%s)",
104 path, strerror(errno));
110 return error("checkout-cache: unknown file mode for %s", path);
115 static int checkout_entry(struct cache_entry *ce, const char *base_dir)
118 static char path[MAXPATHLEN+1];
119 int len = strlen(base_dir);
121 memcpy(path, base_dir, len);
122 strcpy(path + len, ce->name);
124 if (!lstat(path, &st)) {
125 unsigned changed = cache_match_stat(ce, &st);
130 fprintf(stderr, "checkout-cache: %s already exists\n", path);
135 * We unlink the old file, to get the new one with the
136 * right permissions (including umask, which is nasty
137 * to emulate by hand - much easier to let the system
138 * just do the right thing)
143 return write_entry(ce, path);
146 static int checkout_file(const char *name, const char *base_dir)
148 int pos = cache_name_pos(name, strlen(name));
153 "checkout-cache: %s is %s.\n",
156 !strcmp(active_cache[pos]->name, name)) ?
157 "unmerged" : "not in the cache");
161 return checkout_entry(active_cache[pos], base_dir);
164 static int checkout_all(const char *base_dir)
168 for (i = 0; i < active_nr ; i++) {
169 struct cache_entry *ce = active_cache[i];
172 if (checkout_entry(ce, base_dir) < 0)
178 int main(int argc, char **argv)
180 int i, force_filename = 0;
181 const char *base_dir = "";
183 if (read_cache() < 0) {
184 die("invalid cache");
187 for (i = 1; i < argc; i++) {
188 const char *arg = argv[i];
189 if (!force_filename) {
190 if (!strcmp(arg, "-a")) {
191 checkout_all(base_dir);
194 if (!strcmp(arg, "--")) {
198 if (!strcmp(arg, "-f")) {
202 if (!strcmp(arg, "-q")) {
206 if (!strcmp(arg, "-n")) {
210 if (!memcmp(arg, "--prefix=", 9)) {
215 checkout_file(arg, base_dir);