$ git clone -n https://src.fedoraproject.org/rpms/plasma-oxygen.git /var/lib/mock/f40-build-2078133-49590/root/chroot_tmpdir/scmroot/plasma-oxygen
Cloning into '/var/lib/mock/f40-build-2078133-49590/root/chroot_tmpdir/scmroot/plasma-oxygen'...
$ git fetch origin c0c6f4b4a5c72a25d7313f10017dc284a0e013d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-oxygen
 * [new ref]         c0c6f4b4a5c72a25d7313f10017dc284a0e013d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0c6f4b fix: rebuild