$ git clone -n https://src.fedoraproject.org/rpms/kf5-kcalendarutils.git /var/lib/mock/f40-build-787123-134734/root/chroot_tmpdir/scmroot/kf5-kcalendarutils
Cloning into '/var/lib/mock/f40-build-787123-134734/root/chroot_tmpdir/scmroot/kf5-kcalendarutils'...
$ git fetch origin 28d9c46a966a5725b8d0a8338cf416aa80266d45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kcalendarutils
 * [new ref]         28d9c46a966a5725b8d0a8338cf416aa80266d45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28d9c46 23.08.5