$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace.git /var/lib/mock/f40-build-1966259-25208/root/chroot_tmpdir/scmroot/plasma-workspace
Cloning into '/var/lib/mock/f40-build-1966259-25208/root/chroot_tmpdir/scmroot/plasma-workspace'...
$ git fetch origin b2d6d59bbb20c7b556a5cde04563063f640537db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace
 * [new ref]         b2d6d59bbb20c7b556a5cde04563063f640537db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2d6d59 Drop obsoleted patches