$ git clone -n https://src.fedoraproject.org/rpms/cpu-x.git /var/lib/mock/f38-build-side-42-init-devel-1061992-29766/root/chroot_tmpdir/scmroot/cpu-x
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1061992-29766/root/chroot_tmpdir/scmroot/cpu-x'...
$ git fetch origin b47df8c11cf8fa6653262fe0ae4cc25107bca18d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cpu-x
 * [new ref]         b47df8c11cf8fa6653262fe0ae4cc25107bca18d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b47df8c chore: Update to 4.5.2