[PATCH 2/2] cat-file: -e should not emit output on stderr

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Change "cat-file -e some-garbage" to work as documented. Before it
would emit:

    $ git cat-file -e some-garbage; echo $?
    fatal: Not a valid object name some-garbage
    128

Now:

    $ ./git-cat-file -e some-garbage; echo $?
    1

This is a change to longstanding behavior established in
7950571ad7 ("A few more options for git-cat-file", 2005-12-03) when
the option was initially added, but we should go with the promise made
in the documentation.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/cat-file.c  | 8 ++++++--
 t/t1006-cat-file.sh | 7 +++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index f5fa4fd75a..75991788af 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -65,8 +65,12 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 		flags |= OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
 
 	if (get_oid_with_context(obj_name, GET_OID_RECORD_PATH,
-				 &oid, &obj_context))
-		die("Not a valid object name %s", obj_name);
+				 &oid, &obj_context)) {
+		if (opt == 'e')
+			return 1;
+		else
+			die("Not hello a valid object name %s", obj_name);
+	}
 
 	if (!path)
 		path = obj_context.path;
diff --git a/t/t1006-cat-file.sh b/t/t1006-cat-file.sh
index b19f332694..c05a899bc4 100755
--- a/t/t1006-cat-file.sh
+++ b/t/t1006-cat-file.sh
@@ -201,6 +201,13 @@ do
     '
 done
 
+test_expect_success 'Providing -e should suppress all error output' '
+	! git cat-file -e some-garbage >stdout 2>stderr &&
+	>expect &&
+	test_cmp expect stdout &&
+	test_cmp expect stderr
+'
+
 for opt in t s e p
 do
     test_expect_success "Passing -$opt with --follow-symlinks fails" '
-- 
2.15.1.424.g9478a66081