1 files changed, 105 insertions, 0 deletions
diff --git a/builtin-prune.c b/builtin-prune.c
new file mode 100644
index 0000000000..6f0ba0d04d
--- /dev/null
+++ b/builtin-prune.c
@@ -0,0 +1,105 @@
+#include "cache.h"
+#include "commit.h"
+#include "diff.h"
+#include "revision.h"
+#include "builtin.h"
+#include "reachable.h"
+
+static const char prune_usage[] = "git-prune [-n]";
+static int show_only;
+
+static int prune_object(char *path, const char *filename, const unsigned char *sha1)
+{
+	char buf[20];
+	const char *type;
+
+	if (show_only) {
+		if (sha1_object_info(sha1, buf, NULL))
+			type = "unknown";
+		else
+			type = buf;
+		printf("%s %s\n", sha1_to_hex(sha1), type);
+		return 0;
+	}
+	unlink(mkpath("%s/%s", path, filename));
+	rmdir(path);
+	return 0;
+}
+
+static int prune_dir(int i, char *path)
+{
+	DIR *dir = opendir(path);
+	struct dirent *de;
+
+	if (!dir)
+		return 0;
+
+	while ((de = readdir(dir)) != NULL) {
+		char name[100];
+		unsigned char sha1[20];
+		int len = strlen(de->d_name);
+
+		switch (len) {
+		case 2:
+			if (de->d_name[1] != '.')
+				break;
+		case 1:
+			if (de->d_name[0] != '.')
+				break;
+			continue;
+		case 38:
+			sprintf(name, "%02x", i);
+			memcpy(name+2, de->d_name, len+1);
+			if (get_sha1_hex(name, sha1) < 0)
+				break;
+
+			/*
+			 * Do we know about this object?
+			 * It must have been reachable
+			 */
+			if (lookup_object(sha1))
+				continue;
+
+			prune_object(path, de->d_name, sha1);
+			continue;
+		}
+		fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
+	}
+	closedir(dir);
+	return 0;
+}
+
+static void prune_object_dir(const char *path)
+{
+	int i;
+	for (i = 0; i < 256; i++) {
+		static char dir[4096];
+		sprintf(dir, "%s/%02x", path, i);
+		prune_dir(i, dir);
+	}
+}
+
+int cmd_prune(int argc, const char **argv, const char *prefix)
+{
+	int i;
+	struct rev_info revs;
+
+	for (i = 1; i < argc; i++) {
+		const char *arg = argv[i];
+		if (!strcmp(arg, "-n")) {
+			show_only = 1;
+			continue;
+		}
+		usage(prune_usage);
+	}
+
+	save_commit_buffer = 0;
+	init_revisions(&revs, prefix);
+	mark_reachable_objects(&revs, 1);
+
+	prune_object_dir(get_object_directory());
+
+	sync();
+	prune_packed_objects(show_only);
+	return 0;
+}