$ git clone -n https://src.fedoraproject.org/rpms/epiphany.git /var/lib/mock/f40-build-2226344-52922/root/chroot_tmpdir/scmroot/epiphany
Cloning into '/var/lib/mock/f40-build-2226344-52922/root/chroot_tmpdir/scmroot/epiphany'...
$ git fetch origin 122d83e621011a288b1cbcacb992758b55f43427:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/epiphany
 * [new ref]         122d83e621011a288b1cbcacb992758b55f43427 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 122d83e Update to 45.2