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!).
35 #include <sys/param.h>
39 static int force = 0, quiet = 0;
41 static void create_directories(const char *path)
43 int len = strlen(path);
44 char *buf = malloc(len + 1);
45 const char *slash = path;
47 while ((slash = strchr(slash+1, '/')) != NULL) {
49 memcpy(buf, path, len);
55 static int create_file(const char *path, unsigned int mode)
59 mode = (mode & 0100) ? 0777 : 0666;
60 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
62 if (errno == ENOENT) {
63 create_directories(path);
64 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
70 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 fd = create_file(path, ntohl(ce->ce_mode));
86 return error("checkout-cache: unable to create %s (%s)",
87 path, strerror(errno));
89 wrote = write(fd, new, size);
93 return error("checkout-cache: unable to write %s", path);
97 static int checkout_entry(struct cache_entry *ce, const char *base_dir)
100 static char path[MAXPATHLEN+1];
101 int len = strlen(base_dir);
103 memcpy(path, base_dir, len);
104 strcpy(path + len, ce->name);
106 if (!stat(path, &st)) {
107 unsigned changed = cache_match_stat(ce, &st);
112 fprintf(stderr, "checkout-cache: %s already exists\n", path);
117 * We unlink the old file, to get the new one with the
118 * right permissions (including umask, which is nasty
119 * to emulate by hand - much easier to let the system
120 * just do the right thing)
124 return write_entry(ce, path);
127 static int checkout_file(const char *name, const char *base_dir)
129 int pos = cache_name_pos(name, strlen(name));
134 "checkout-cache: %s is %s.\n",
137 !strcmp(active_cache[pos]->name, name)) ?
138 "unmerged" : "not in the cache");
142 return checkout_entry(active_cache[pos], base_dir);
145 static int checkout_all(const char *base_dir)
149 for (i = 0; i < active_nr ; i++) {
150 struct cache_entry *ce = active_cache[i];
153 if (checkout_entry(ce, base_dir) < 0)
159 int main(int argc, char **argv)
161 int i, force_filename = 0;
162 const char *base_dir = "";
164 if (read_cache() < 0) {
165 die("invalid cache");
168 for (i = 1; i < argc; i++) {
169 const char *arg = argv[i];
170 if (!force_filename) {
171 if (!strcmp(arg, "-a")) {
172 checkout_all(base_dir);
175 if (!strcmp(arg, "--")) {
179 if (!strcmp(arg, "-f")) {
183 if (!strcmp(arg, "-q")) {
187 if (!memcmp(arg, "--prefix=", 9)) {
192 checkout_file(arg, base_dir);