$ git clone -n https://src.fedoraproject.org/rpms/xr-hardware.git /var/lib/mock/f45-build-39107-732/root/chroot_tmpdir/scmroot/xr-hardware
Cloning into '/var/lib/mock/f45-build-39107-732/root/chroot_tmpdir/scmroot/xr-hardware'...
$ git fetch origin 364298a388b2de64d72d9beffbd2d84889235c6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xr-hardware
 * [new ref]         364298a388b2de64d72d9beffbd2d84889235c6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 364298a Update to latest (fedora#2509960).