$ git clone -n https://src.fedoraproject.org/rpms/signon-ui.git /var/lib/mock/f42-build-3458048-45512/root/chroot_tmpdir/scmroot/signon-ui
Cloning into '/var/lib/mock/f42-build-3458048-45512/root/chroot_tmpdir/scmroot/signon-ui'...
$ git fetch origin 5d6f5707519c1a151319c20396da492b77a92e75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/signon-ui
 * [new ref]         5d6f5707519c1a151319c20396da492b77a92e75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d6f570 Rebuild for ppc64le enablement