blame: default to HEAD in a bare repo when no start commit is given

diff --git a/builtin/blame.c b/builtin/blame.c
index 581de0d8322681ef11026b3e36a81c7baf0fda38..8f66eb478606ce468244cd195507bd4c7f2c748f 100644 (file)
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -27,6 +27,7 @@
 #include "object-store.h"
 #include "blame.h"
 #include "string-list.h"
+#include "refs.h"
 
 static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] <file>");
 
@@ -993,6 +994,18 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 
        revs.disable_stdin = 1;
        setup_revisions(argc, argv, &revs, NULL);
+       if (!revs.pending.nr && is_bare_repository()) {
+               struct commit *head_commit;
+               struct object_id head_oid;
+
+               if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
+                                       &head_oid, NULL) ||
+                   !(head_commit = lookup_commit_reference_gently(revs.repo,
+                                                            &head_oid, 1)))
+                       die("no such ref: HEAD");
+
+               add_pending_object(&revs, &head_commit->object, "HEAD");
+       }
 
        init_scoreboard(&sb);
        sb.revs = &revs;