git-send-email: Respect core.hooksPath setting

get-send-email currently makes the assumption that the
'sendemail-validate' hook exists inside of the repository.

Since the introduction of 'core.hooksPath' configuration option in
867ad08a26 (hooks: allow customizing where the hook directory is,
2016-05-04), this is no longer true.

Instead of assuming a hardcoded repo relative path, query
git for the actual path of the hooks directory.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -1942,7 +1942,7 @@ sub validate_patch {
 	my ($fn, $xfer_encoding) = @_;
 
 	if ($repo) {
-		my $validate_hook = catfile(catdir($repo->repo_path(), 'hooks'),
+		my $validate_hook = catfile($repo->hooks_path(),
 					    'sendemail-validate');
 		my $hook_error;
 		if (-x $validate_hook) {

perl/Git.pm

@@ -619,6 +619,19 @@ Return path to the git repository. Must be called on a repository instance.
 
 sub repo_path { $_[0]->{opts}->{Repository} }
 
+=item hooks_path ()
+
+Return path to the hooks directory. Must be called on a repository instance.
+
+=cut
+
+sub hooks_path {
+	my ($self) = @_;
+
+	my $dir = $self->command_oneline('rev-parse', '--git-path', 'hooks');
+	my $abs = abs_path($dir);
+	return $abs;
+}
 
 =item wc_path ()
 

t/t9001-send-email.sh

@@ -513,6 +513,38 @@ do
 
 done
 
+test_expect_success $PREREQ "--validate respects relative core.hooksPath path" '
+	clean_fake_sendmail &&
+	mkdir my-hooks &&
+	test_when_finished "rm my-hooks.ran" &&
+	write_script my-hooks/sendemail-validate <<-\EOF &&
+	>my-hooks.ran
+	exit 1
+	EOF
+	test_config core.hooksPath "my-hooks" &&
+	test_must_fail git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate \
+		longline.patch 2>err &&
+	test_path_is_file my-hooks.ran &&
+	grep "rejected by sendemail-validate" err
+'
+
+test_expect_success $PREREQ "--validate respects absolute core.hooksPath path" '
+	test_config core.hooksPath "$(pwd)/my-hooks" &&
+	test_when_finished "rm my-hooks.ran" &&
+	test_must_fail git send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate \
+		longline.patch 2>err &&
+	test_path_is_file my-hooks.ran &&
+	grep "rejected by sendemail-validate" err
+'
+
 for enc in 7bit 8bit quoted-printable base64
 do
 	test_expect_success $PREREQ "--transfer-encoding=$enc produces correct header" '