$ git clone -n https://src.fedoraproject.org/rpms/plasma-oxygen.git /var/lib/mock/f40-build-2526530-61812/root/chroot_tmpdir/scmroot/plasma-oxygen
Cloning into '/var/lib/mock/f40-build-2526530-61812/root/chroot_tmpdir/scmroot/plasma-oxygen'...
$ git fetch origin 5ecb0b14bcf553b33f16a2142ef0adfa3be70045:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-oxygen
 * [new ref]         5ecb0b14bcf553b33f16a2142ef0adfa3be70045 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ecb0b1 6.0.1