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-rw-r--r--checkout-index.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/checkout-index.c b/checkout-index.c
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+++ b/checkout-index.c
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+/*
+ * Check-out files from the "current cache directory"
+ *
+ * Copyright (C) 2005 Linus Torvalds
+ *
+ * Careful: order of argument flags does matter. For example,
+ *
+ * git-checkout-index -a -f file.c
+ *
+ * Will first check out all files listed in the cache (but not
+ * overwrite any old ones), and then force-checkout "file.c" a
+ * second time (ie that one _will_ overwrite any old contents
+ * with the same filename).
+ *
+ * Also, just doing "git-checkout-index" does nothing. You probably
+ * meant "git-checkout-index -a". And if you want to force it, you
+ * want "git-checkout-index -f -a".
+ *
+ * Intuitiveness is not the goal here. Repeatability is. The
+ * reason for the "no arguments means no work" thing is that
+ * from scripts you are supposed to be able to do things like
+ *
+ * find . -name '*.h' -print0 | xargs -0 git-checkout-index -f --
+ *
+ * which will force all existing *.h files to be replaced with
+ * their cached copies. If an empty command line implied "all",
+ * then this would force-refresh everything in the cache, which
+ * was not the point.
+ *
+ * Oh, and the "--" is just a good idea when you know the rest
+ * will be filenames. Just so that you wouldn't have a filename
+ * of "-a" causing problems (not possible in the above example,
+ * but get used to it in scripting!).
+ */
+#include "cache.h"
+
+static struct checkout state = {
+ .base_dir = "",
+ .base_dir_len = 0,
+ .force = 0,
+ .quiet = 0,
+ .not_new = 0,
+ .refresh_cache = 0,
+};
+
+static int checkout_file(const char *name)
+{
+ int pos = cache_name_pos(name, strlen(name));
+ if (pos < 0) {
+ if (!state.quiet) {
+ pos = -pos - 1;
+ fprintf(stderr,
+ "git-checkout-index: %s is %s.\n",
+ name,
+ (pos < active_nr &&
+ !strcmp(active_cache[pos]->name, name)) ?
+ "unmerged" : "not in the cache");
+ }
+ return -1;
+ }
+ return checkout_entry(active_cache[pos], &state);
+}
+
+static int checkout_all(void)
+{
+ int i;
+
+ for (i = 0; i < active_nr ; i++) {
+ struct cache_entry *ce = active_cache[i];
+ if (ce_stage(ce))
+ continue;
+ if (checkout_entry(ce, &state) < 0)
+ return -1;
+ }
+ return 0;
+}
+
+static const char checkout_cache_usage[] =
+"git-checkout-index [-u] [-q] [-a] [-f] [-n] [--prefix=<string>] [--] <file>...";
+
+static struct cache_file cache_file;
+
+int main(int argc, char **argv)
+{
+ int i, force_filename = 0;
+ int newfd = -1;
+
+ if (read_cache() < 0) {
+ die("invalid cache");
+ }
+
+ for (i = 1; i < argc; i++) {
+ const char *arg = argv[i];
+ if (!force_filename) {
+ if (!strcmp(arg, "-a")) {
+ checkout_all();
+ continue;
+ }
+ if (!strcmp(arg, "--")) {
+ force_filename = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-f")) {
+ state.force = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-q")) {
+ state.quiet = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-n")) {
+ state.not_new = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-u")) {
+ state.refresh_cache = 1;
+ if (newfd < 0)
+ newfd = hold_index_file_for_update
+ (&cache_file,
+ get_index_file());
+ if (newfd < 0)
+ die("cannot open index.lock file.");
+ continue;
+ }
+ if (!memcmp(arg, "--prefix=", 9)) {
+ state.base_dir = arg+9;
+ state.base_dir_len = strlen(state.base_dir);
+ continue;
+ }
+ if (arg[0] == '-')
+ usage(checkout_cache_usage);
+ }
+ if (state.base_dir_len) {
+ /* when --prefix is specified we do not
+ * want to update cache.
+ */
+ if (state.refresh_cache) {
+ close(newfd); newfd = -1;
+ rollback_index_file(&cache_file);
+ }
+ state.refresh_cache = 0;
+ }
+ checkout_file(arg);
+ }
+
+ if (0 <= newfd &&
+ (write_cache(newfd, active_cache, active_nr) ||
+ commit_index_file(&cache_file)))
+ die("Unable to write new cachefile");
+ return 0;
+}