[PATCH v2] git-send-email: Respect core.hooksPath setting

[Robert Foss <robert.foss@linaro.org>]

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
v2.9, 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>
---

Changes since v1:
 - Ævar: Add unit test
 - Ævar: Add support for getting the hooks_path() from Git perl module
 - Ævar: Use new hooks_path() instread of issuing git rev-parse in
         git-send-email.perl


Note: The test currently leaves a file in a mktemp directory
in /tmp.

 git-send-email.perl   |  4 ++--
 perl/Git.pm           |  9 +++++++++
 t/t9001-send-email.sh | 16 ++++++++++++++++
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index 1f425c0809..c3dd825322 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1942,8 +1942,8 @@ sub validate_patch {
 	my ($fn, $xfer_encoding) = @_;
 
 	if ($repo) {
-		my $validate_hook = catfile(catdir($repo->repo_path(), 'hooks'),
-					    'sendemail-validate');
+		my $hook_path = $repo->hooks_path();
+		my $validate_hook = catfile($hook_path, 'sendemail-validate');
 		my $hook_error;
 		if (-x $validate_hook) {
 			my $target = abs_path($fn);
diff --git a/perl/Git.pm b/perl/Git.pm
index 02eacef0c2..ac1fabff28 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -226,6 +226,8 @@ sub repository {
 			$opts{Repository} = abs_path($dir);
 		}
 
+                $opts{HooksPath} = $search->command_oneline('rev-parse', '--git-path', 'hooks');
+
 		delete $opts{Directory};
 	}
 
@@ -619,6 +621,13 @@ sub _prompt {
 
 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 { $_[0]->{opts}->{HooksPath} }
 
 =item wc_path ()
 
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 4eee9c3dcb..73b3bc1ce6 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -513,6 +513,22 @@ do
 
 done
 
+test_expect_success $PREREQ "--validate respects core.hooksPath setting" '
+	clean_fake_sendmail &&
+	tmp_dir=$(mktemp -d -t ci-XXXXXXXXXX) &&
+	printf "#!/bin/sh" >> $tmp_dir/sendemail-validate &&
+	printf "return 1" >> $tmp_dir/sendemail-validate &&
+	chmod a+x $tmp_dir/sendemail-validate &&
+	git -c core.hooksPath=$tmp_dir send-email \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--smtp-server="$(pwd)/fake.sendmail" \
+		--validate \
+		longline.patch \
+		2>&1 >/dev/null | \
+	grep "rejected by sendemail-validate"
+'
+
 for enc in 7bit 8bit quoted-printable base64
 do
 	test_expect_success $PREREQ "--transfer-encoding=$enc produces correct header" '
-- 
2.31.0.30.g398dba342d.dirty