$ git clone -n https://src.fedoraproject.org/rpms/php-sebastian-environment7.git /var/lib/mock/f42-build-side-1-3537858-46560/root/chroot_tmpdir/scmroot/php-sebastian-environment7
Cloning into '/var/lib/mock/f42-build-side-1-3537858-46560/root/chroot_tmpdir/scmroot/php-sebastian-environment7'...
$ git fetch origin f4d462ed21d95b7ffc1f5bcccf971c7bdd1c4c60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-sebastian-environment7
 * [new ref]         f4d462ed21d95b7ffc1f5bcccf971c7bdd1c4c60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4d462e v7.2.1