1 files changed, 151 insertions, 0 deletions
diff --git a/checkout-index.c b/checkout-index.c
new file mode 100644
index 000000000..f32513c50
--- /dev/null
+++ b/checkout-index.c
@@ -0,0 +1,151 @@
+/*
+ * 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;
+}