$ git clone -n https://src.fedoraproject.org/rpms/firecracker.git /var/lib/mock/f38-build-side-42-init-devel-1259182-30642/root/chroot_tmpdir/scmroot/firecracker
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1259182-30642/root/chroot_tmpdir/scmroot/firecracker'...
$ git fetch origin 2cf66c369879aebe6a68dd31752bcffdac9053c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firecracker
 * [new ref]         2cf66c369879aebe6a68dd31752bcffdac9053c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cf66c3 Update to version 1.4.1