$ git clone -n https://src.fedoraproject.org/rpms/gnome-calendar.git /var/lib/mock/f40-build-2688991-68100/root/chroot_tmpdir/scmroot/gnome-calendar
Cloning into '/var/lib/mock/f40-build-2688991-68100/root/chroot_tmpdir/scmroot/gnome-calendar'...
$ git fetch origin 985dfc3000e1cd7b5523935ff00b69f8862b1fdf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-calendar
 * [new ref]         985dfc3000e1cd7b5523935ff00b69f8862b1fdf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 985dfc3 Update to 46.0