1 files changed, 153 insertions, 0 deletions
diff --git a/builtin/prune.c b/builtin/prune.c
new file mode 100644
index 0000000000..04d3b12ae4
--- /dev/null
+++ b/builtin/prune.c
@@ -0,0 +1,153 @@
+#include "cache.h"
+#include "commit.h"
+#include "diff.h"
+#include "revision.h"
+#include "builtin.h"
+#include "reachable.h"
+#include "parse-options.h"
+#include "progress.h"
+#include "dir.h"
+
+static const char * const prune_usage[] = {
+	N_("git prune [-n] [-v] [--expire <time>] [--] [<head>...]"),
+	NULL
+};
+static int show_only;
+static int verbose;
+static unsigned long expire;
+static int show_progress = -1;
+
+static int prune_tmp_file(const char *fullpath)
+{
+	struct stat st;
+	if (lstat(fullpath, &st))
+		return error("Could not stat '%s'", fullpath);
+	if (st.st_mtime > expire)
+		return 0;
+	if (show_only || verbose)
+		printf("Removing stale temporary file %s\n", fullpath);
+	if (!show_only)
+		unlink_or_warn(fullpath);
+	return 0;
+}
+
+static int prune_object(const unsigned char *sha1, const char *fullpath,
+			void *data)
+{
+	struct stat st;
+
+	/*
+	 * Do we know about this object?
+	 * It must have been reachable
+	 */
+	if (lookup_object(sha1))
+		return 0;
+
+	if (lstat(fullpath, &st)) {
+		/* report errors, but do not stop pruning */
+		error("Could not stat '%s'", fullpath);
+		return 0;
+	}
+	if (st.st_mtime > expire)
+		return 0;
+	if (show_only || verbose) {
+		enum object_type type = sha1_object_info(sha1, NULL);
+		printf("%s %s\n", sha1_to_hex(sha1),
+		       (type > 0) ? typename(type) : "unknown");
+	}
+	if (!show_only)
+		unlink_or_warn(fullpath);
+	return 0;
+}
+
+static int prune_cruft(const char *basename, const char *path, void *data)
+{
+	if (starts_with(basename, "tmp_obj_"))
+		prune_tmp_file(path);
+	else
+		fprintf(stderr, "bad sha1 file: %s\n", path);
+	return 0;
+}
+
+static int prune_subdir(int nr, const char *path, void *data)
+{
+	if (!show_only)
+		rmdir(path);
+	return 0;
+}
+
+/*
+ * Write errors (particularly out of space) can result in
+ * failed temporary packs (and more rarely indexes and other
+ * files beginning with "tmp_") accumulating in the object
+ * and the pack directories.
+ */
+static void remove_temporary_files(const char *path)
+{
+	DIR *dir;
+	struct dirent *de;
+
+	dir = opendir(path);
+	if (!dir) {
+		fprintf(stderr, "Unable to open directory %s\n", path);
+		return;
+	}
+	while ((de = readdir(dir)) != NULL)
+		if (starts_with(de->d_name, "tmp_"))
+			prune_tmp_file(mkpath("%s/%s", path, de->d_name));
+	closedir(dir);
+}
+
+int cmd_prune(int argc, const char **argv, const char *prefix)
+{
+	struct rev_info revs;
+	struct progress *progress = NULL;
+	const struct option options[] = {
+		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
+		OPT__VERBOSE(&verbose, N_("report pruned objects")),
+		OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
+		OPT_EXPIRY_DATE(0, "expire", &expire,
+				N_("expire objects older than <time>")),
+		OPT_END()
+	};
+	char *s;
+
+	expire = ULONG_MAX;
+	save_commit_buffer = 0;
+	check_replace_refs = 0;
+	init_revisions(&revs, prefix);
+
+	argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
+	while (argc--) {
+		unsigned char sha1[20];
+		const char *name = *argv++;
+
+		if (!get_sha1(name, sha1)) {
+			struct object *object = parse_object_or_die(sha1, name);
+			add_pending_object(&revs, object, "");
+		}
+		else
+			die("unrecognized argument: %s", name);
+	}
+
+	if (show_progress == -1)
+		show_progress = isatty(2);
+	if (show_progress)
+		progress = start_progress_delay(_("Checking connectivity"), 0, 0, 2);
+
+	mark_reachable_objects(&revs, 1, expire, progress);
+	stop_progress(&progress);
+	for_each_loose_file_in_objdir(get_object_directory(), prune_object,
+				      prune_cruft, prune_subdir, NULL);
+
+	prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
+	remove_temporary_files(get_object_directory());
+	s = mkpathdup("%s/pack", get_object_directory());
+	remove_temporary_files(s);
+	free(s);
+
+	if (is_repository_shallow())
+		prune_shallow(show_only);
+
+	return 0;
+}