t1517: test commands that are designed to be run outside repository

A few commands, like "git apply" and "git patch-id", have been
broken with a recent change to stop setting the default hash
algorithm to SHA-1.  Test them and fix them in later commits.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1517-outside-repo.sh

@@ -0,0 +1,59 @@
+#!/bin/sh
+
+test_description='check random commands outside repo'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+test_expect_success 'set up a non-repo directory and test file' '
+	GIT_CEILING_DIRECTORIES=$(pwd) &&
+	export GIT_CEILING_DIRECTORIES &&
+	mkdir non-repo &&
+	(
+		cd non-repo &&
+		# confirm that git does not find a repo
+		test_must_fail git rev-parse --git-dir
+	) &&
+	test_write_lines one two three four >nums &&
+	git add nums &&
+	cp nums nums.old &&
+	test_write_lines five >>nums &&
+	git diff >sample.patch
+'
+
+test_expect_failure 'compute a patch-id outside repository (uses SHA-1)' '
+	nongit env GIT_DEFAULT_HASH=sha1 \
+		git patch-id <sample.patch >patch-id.expect &&
+	nongit \
+		git patch-id <sample.patch >patch-id.actual &&
+	test_cmp patch-id.expect patch-id.actual
+'
+
+test_expect_failure 'hash-object outside repository (uses SHA-1)' '
+	nongit env GIT_DEFAULT_HASH=sha1 \
+		git hash-object --stdin <sample.patch >hash.expect &&
+	nongit \
+		git hash-object --stdin <sample.patch >hash.actual &&
+	test_cmp hash.expect hash.actual
+'
+
+test_expect_failure 'apply a patch outside repository' '
+	(
+		cd non-repo &&
+		cp ../nums.old nums &&
+		git apply ../sample.patch
+	) &&
+	test_cmp nums non-repo/nums
+'
+
+test_expect_success 'grep outside repository' '
+	git grep --cached two >expect &&
+	(
+		cd non-repo &&
+		cp ../nums.old nums &&
+		git grep --no-index two >../actual
+	) &&
+	test_cmp expect actual
+'
+
+test_done