$ git clone -n https://src.fedoraproject.org/rpms/gnome-calendar.git /var/lib/mock/f40-build-795063-139926/root/chroot_tmpdir/scmroot/gnome-calendar
Cloning into '/var/lib/mock/f40-build-795063-139926/root/chroot_tmpdir/scmroot/gnome-calendar'...
$ git fetch origin 9176112d2170fcbae28d1bf4860277d452e073c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-calendar
 * [new ref]         9176112d2170fcbae28d1bf4860277d452e073c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9176112 Update to 46.rc