$ git clone -n https://src.fedoraproject.org/rpms/libxslt.git /var/lib/mock/f41-build-814188-148916/root/chroot_tmpdir/scmroot/libxslt
Cloning into '/var/lib/mock/f41-build-814188-148916/root/chroot_tmpdir/scmroot/libxslt'...
$ git fetch origin 789d2591716704d706885e39681d5aa83a498c60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxslt
 * [new ref]         789d2591716704d706885e39681d5aa83a498c60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 789d259 1.1.42