$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f40-build-2120374-50738/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f40-build-2120374-50738/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin 4c0552852514c4a841bc2f4e10128f8c2999c398:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         4c0552852514c4a841bc2f4e10128f8c2999c398 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c05528 Rebase favourites patch