$ git clone -n https://src.fedoraproject.org/rpms/plasma-vault.git /var/lib/mock/f41-build-854676-166922/root/chroot_tmpdir/scmroot/plasma-vault
Cloning into '/var/lib/mock/f41-build-854676-166922/root/chroot_tmpdir/scmroot/plasma-vault'...
$ git fetch origin dda78d5c8cdbced6005278447583b2d349aef067:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-vault
 * [new ref]         dda78d5c8cdbced6005278447583b2d349aef067 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dda78d5 6.1.90