$ git clone -n https://src.fedoraproject.org/rpms/gnome-clocks.git /var/lib/mock/f40-build-1998995-44290/root/chroot_tmpdir/scmroot/gnome-clocks
Cloning into '/var/lib/mock/f40-build-1998995-44290/root/chroot_tmpdir/scmroot/gnome-clocks'...
$ git fetch origin e5fb4073f73cbd92050cfce4b11c05ead907f402:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-clocks
 * [new ref]         e5fb4073f73cbd92050cfce4b11c05ead907f402 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5fb407 Update to 45.0