am: teach StGit patch parser how to read from stdin

diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 0ead529a2f3f57d028ae7944798296f3fb1459ef..51962e481ea69e476776a15d7a651ed25ade5f01 100755 (executable)
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -209,6 +209,16 @@ test_expect_success 'am applies stgit patch' '
        test_cmp_rev second^ HEAD^
 '
 
+test_expect_success 'am --patch-format=stgit applies stgit patch' '
+       rm -fr .git/rebase-apply &&
+       git checkout -f first &&
+       git am --patch-format=stgit <patch1-stgit.eml &&
+       test_path_is_missing .git/rebase-apply &&
+       git diff --exit-code second &&
+       test_cmp_rev second HEAD &&
+       test_cmp_rev second^ HEAD^
+'
+
 test_expect_success 'setup: new author and committer' '
        GIT_AUTHOR_NAME="Another Thor" &&
        GIT_AUTHOR_EMAIL="a.thor@example.com" &&