$ git clone -n https://src.fedoraproject.org/rpms/Pencil2D.git /var/lib/mock/f41-build-side-1-2749567-31004/root/chroot_tmpdir/scmroot/Pencil2D
Cloning into '/var/lib/mock/f41-build-side-1-2749567-31004/root/chroot_tmpdir/scmroot/Pencil2D'...
$ git fetch origin f8fac8668c7db9aa22c3384fdda49de1dfae5af7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Pencil2D
 * [new ref]         f8fac8668c7db9aa22c3384fdda49de1dfae5af7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8fac86 Fix localized package descriptions