$ git clone -n https://src.fedoraproject.org/rpms/firecracker.git /var/lib/mock/f40-build-2236835-53519/root/chroot_tmpdir/scmroot/firecracker
Cloning into '/var/lib/mock/f40-build-2236835-53519/root/chroot_tmpdir/scmroot/firecracker'...
$ git fetch origin 31f3e00656fe8e09bb6fc5fa003d495caf61ffee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firecracker
 * [new ref]         31f3e00656fe8e09bb6fc5fa003d495caf61ffee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31f3e00 Backport vmm-sys-util updates for CVE-2023-50711