If the tree contains a sub-directory then git-grep(1) output contains a
colon character instead of a path separator:

  $ git grep malloc v2.9.3:t
  v2.9.3:t:test-lib.sh: setup_malloc_check () {
  $ git show v2.9.3:t:test-lib.sh
  fatal: Path 't:test-lib.sh' does not exist in 'v2.9.3'

This patch attempts to use the correct delimiter:

  $ git grep malloc v2.9.3:t
  v2.9.3:t/test-lib.sh: setup_malloc_check () {
  $ git show v2.9.3:t/test-lib.sh
  (success)

Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
 builtin/grep.c  | 4 +++-
 t/t7810-grep.sh | 5 +++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/builtin/grep.c b/builtin/grep.c
index 90a4f3d..7a7aab9 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -494,7 +494,9 @@ static int grep_object(struct grep_opt *opt, const struct 
pathspec *pathspec,
 
                        /* Add a delimiter if there isn't one already */
                        if (name[len - 1] != '/' && name[len - 1] != ':') {
-                               strbuf_addch(&base, ':');
+                               /* rev: or rev:path/ */
+                               char delim = obj->type == OBJ_COMMIT ? ':' : 
'/';
+                               strbuf_addch(&base, delim);
                        }
                }
                init_tree_desc(&tree, data, size);
diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index e804a3f..8a58d5e 100755
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -1445,6 +1445,11 @@ test_expect_success 'grep outputs valid <rev>:<path> for 
HEAD:t/' '
        test_cmp expected actual
 '
 
+test_expect_success 'grep outputs valid <rev>:<path> for HEAD:t' '
+       git grep vvv HEAD:t >actual &&
+       test_cmp expected actual
+'
+
 cat >expected <<EOF
 HEAD:t/a/v:vvv
 HEAD:t/v:vvv
-- 
2.9.3

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