$ git clone -n https://src.fedoraproject.org/rpms/plasma-mobile.git /var/lib/mock/f40-build-2526524-61812/root/chroot_tmpdir/scmroot/plasma-mobile
Cloning into '/var/lib/mock/f40-build-2526524-61812/root/chroot_tmpdir/scmroot/plasma-mobile'...
$ git fetch origin 39575a0c7d06d015f4872b0bbbd7d245b84fd35e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-mobile
 * [new ref]         39575a0c7d06d015f4872b0bbbd7d245b84fd35e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39575a0 6.0.1