1 files changed, 56 insertions, 0 deletions
diff --git a/build-rev-cache.c b/build-rev-cache.c
new file mode 100644
index 0000000000..948898beb4
--- /dev/null
+++ b/build-rev-cache.c
@@ -0,0 +1,56 @@
+#include "refs.h"
+#include "cache.h"
+#include "commit.h"
+#include "rev-cache.h"
+
+static void process_head_list(int verbose)
+{
+	char buf[512];
+
+	while (fgets(buf, sizeof(buf), stdin)) {
+		unsigned char sha1[20];
+		struct commit *commit;
+
+		if (get_sha1_hex(buf, sha1)) {
+			error("ignoring: %s", buf);
+			continue;
+		}
+		if (!(commit = lookup_commit_reference(sha1))) {
+			error("not a commit: %s", sha1_to_hex(sha1));
+			continue;
+		}
+		record_rev_cache(commit->object.sha1, verbose ? stderr : NULL);
+	}
+}
+
+
+static const char *build_rev_cache_usage =
+"git-build-rev-cache <rev-cache-file> < list-of-heads";
+
+int main(int ac, char **av)
+{
+	int verbose = 0;
+	const char *path;
+
+	while (1 < ac && av[1][0] == '-') {
+		if (!strcmp(av[1], "-v"))
+			verbose = 1;
+		else
+			usage(build_rev_cache_usage);
+		ac--; av++;
+	}
+
+	if (ac != 2)
+		usage(build_rev_cache_usage);
+
+	path = av[1];
+
+	/* read existing rev-cache */
+	read_rev_cache(path, NULL, 0);
+
+	process_head_list(verbose);
+
+	/* update the rev-cache database by appending newly found one to it */
+	write_rev_cache(path, path);
+	return 0;
+}