$ git clone -n https://src.fedoraproject.org/rpms/plasma-vault.git /var/lib/mock/f40-build-1509051-23893/root/chroot_tmpdir/scmroot/plasma-vault
Cloning into '/var/lib/mock/f40-build-1509051-23893/root/chroot_tmpdir/scmroot/plasma-vault'...
$ git fetch origin b2c22984df8cb10a3c76bff2777c1d98d35185d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-vault
 * [new ref]         b2c22984df8cb10a3c76bff2777c1d98d35185d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2c2298 6.1.2