$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace-x11.git /var/lib/mock/f42-build-862486-170829/root/chroot_tmpdir/scmroot/plasma-workspace-x11
Cloning into '/var/lib/mock/f42-build-862486-170829/root/chroot_tmpdir/scmroot/plasma-workspace-x11'...
$ git fetch origin ad4908cf610e2e7466b0ad05fe36b59adea97a94:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace-x11
 * [new ref]         ad4908cf610e2e7466b0ad05fe36b59adea97a94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad4908c Requires: kf6-kidletime-x11 (hard Requires).