$ git clone -n https://src.fedoraproject.org/rpms/firecracker.git /var/lib/mock/f39-build-2448072-61041/root/chroot_tmpdir/scmroot/firecracker
Cloning into '/var/lib/mock/f39-build-2448072-61041/root/chroot_tmpdir/scmroot/firecracker'...
$ git fetch origin a8ea94175d3939a94714506756e6474f20758d58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firecracker
 * [new ref]         a8ea94175d3939a94714506756e6474f20758d58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8ea941 Update linux-loader for the upstream vmm-sys-util CVE fix