$ git clone -n https://src.fedoraproject.org/rpms/ghc-vector-builder.git /var/lib/mock/f40-build-1998434-44237/root/chroot_tmpdir/scmroot/ghc-vector-builder
Cloning into '/var/lib/mock/f40-build-1998434-44237/root/chroot_tmpdir/scmroot/ghc-vector-builder'...
$ git fetch origin 403532446fa256aef021da0e1c84bf749a66b2a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vector-builder
 * [new ref]         403532446fa256aef021da0e1c84bf749a66b2a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4035324 bump release