$ git clone -n https://src.fedoraproject.org/rpms/plasma-vault.git /var/lib/mock/f42-build-side-1-3578422-46814/root/chroot_tmpdir/scmroot/plasma-vault
Cloning into '/var/lib/mock/f42-build-side-1-3578422-46814/root/chroot_tmpdir/scmroot/plasma-vault'...
$ git fetch origin 1962c47f9ee18955ef8de0775c085e9e6afb91a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-vault
 * [new ref]         1962c47f9ee18955ef8de0775c085e9e6afb91a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1962c47 6.4.1