$ git clone -n https://src.fedoraproject.org/rpms/plasma-vault.git /var/lib/mock/f40-build-788841-135430/root/chroot_tmpdir/scmroot/plasma-vault
Cloning into '/var/lib/mock/f40-build-788841-135430/root/chroot_tmpdir/scmroot/plasma-vault'...
$ git fetch origin a96331f2a054afdb428683a3ac69b357472775e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-vault
 * [new ref]         a96331f2a054afdb428683a3ac69b357472775e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a96331f 6.0.0