$ git clone -n https://src.fedoraproject.org/rpms/kf5-kjsembed.git /var/lib/mock/f40-build-787324-134746/root/chroot_tmpdir/scmroot/kf5-kjsembed
Cloning into '/var/lib/mock/f40-build-787324-134746/root/chroot_tmpdir/scmroot/kf5-kjsembed'...
$ git fetch origin febe0e40099eb577a0529339a4adc21759c0a968:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kjsembed
 * [new ref]         febe0e40099eb577a0529339a4adc21759c0a968 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at febe0e4 5.115.0