$ git clone -n https://src.fedoraproject.org/rpms/golang-github-insomniacslk-dhcp.git /var/lib/mock/f40-build-2584099-62404/root/chroot_tmpdir/scmroot/golang-github-insomniacslk-dhcp
Cloning into '/var/lib/mock/f40-build-2584099-62404/root/chroot_tmpdir/scmroot/golang-github-insomniacslk-dhcp'...
$ git fetch origin 598577fa2d9196ac062d4357f3c48fb6148e18a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-insomniacslk-dhcp
 * [new ref]         598577fa2d9196ac062d4357f3c48fb6148e18a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 598577f Update to git snapshot 8c70d40