$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcalendarcore.git /var/lib/mock/f42-build-862043-170551/root/chroot_tmpdir/scmroot/kf6-kcalendarcore
Cloning into '/var/lib/mock/f42-build-862043-170551/root/chroot_tmpdir/scmroot/kf6-kcalendarcore'...
$ git fetch origin 8dcc5c1722a2e925a52f5df609015141ba74b155:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcalendarcore
 * [new ref]         8dcc5c1722a2e925a52f5df609015141ba74b155 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8dcc5c1 6.8.0