$ git clone -n https://src.fedoraproject.org/rpms/php-sebastian-diff7.git /var/lib/mock/f42-build-3224753-41162/root/chroot_tmpdir/scmroot/php-sebastian-diff7
Cloning into '/var/lib/mock/f42-build-3224753-41162/root/chroot_tmpdir/scmroot/php-sebastian-diff7'...
$ git fetch origin 9fa8e934a50a06192d4a8500ec40cdc027315f43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-sebastian-diff7
 * [new ref]         9fa8e934a50a06192d4a8500ec40cdc027315f43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fa8e93 enable tests