$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace-x11.git /var/lib/mock/f41-build-1023968-18174/root/chroot_tmpdir/scmroot/plasma-workspace-x11
Cloning into '/var/lib/mock/f41-build-1023968-18174/root/chroot_tmpdir/scmroot/plasma-workspace-x11'...
$ git fetch origin 808290c7e6d90623505d3f96291affde4d1644e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace-x11
 * [new ref]         808290c7e6d90623505d3f96291affde4d1644e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 808290c Update to 6.1.0.