$ git clone -n https://src.fedoraproject.org/rpms/epiphany.git /var/lib/mock/f40-build-1995499-43913/root/chroot_tmpdir/scmroot/epiphany
Cloning into '/var/lib/mock/f40-build-1995499-43913/root/chroot_tmpdir/scmroot/epiphany'...
$ git fetch origin 443ba6d34040a45d199438090963ab8d9eeca4b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/epiphany
 * [new ref]         443ba6d34040a45d199438090963ab8d9eeca4b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 443ba6d Update to 45.1