$ git clone -n https://src.fedoraproject.org/rpms/virt-firmware-rs.git /var/lib/mock/f43-build-61011588-6587665/root/chroot_tmpdir/scmroot/virt-firmware-rs
Cloning into '/var/lib/mock/f43-build-61011588-6587665/root/chroot_tmpdir/scmroot/virt-firmware-rs'...
$ git fetch origin a934cac74bf86b08e91567e5d39b8c9490195baa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/virt-firmware-rs
 * [new ref]         a934cac74bf86b08e91567e5d39b8c9490195baa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a934cac initial package