$ git clone -n https://src.fedoraproject.org/rpms/ignition-fuel-tools.git /var/lib/mock/f38-build-side-42-init-devel-1024204-29667/root/chroot_tmpdir/scmroot/ignition-fuel-tools
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1024204-29667/root/chroot_tmpdir/scmroot/ignition-fuel-tools'...
$ git fetch origin 8c5647095ab58054ecc34cdf45bab0b8a0add58d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ignition-fuel-tools
 * [new ref]         8c5647095ab58054ecc34cdf45bab0b8a0add58d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c56470 Added the README