$ git clone -n https://src.fedoraproject.org/rpms/buildstream.git /var/lib/mock/f38-build-side-42-init-devel-870459-28442/root/chroot_tmpdir/scmroot/buildstream
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-870459-28442/root/chroot_tmpdir/scmroot/buildstream'...
$ git fetch origin 9b94de6bd7aa1bf31ff87a44b7b0258040d5365f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/buildstream
 * [new ref]         9b94de6bd7aa1bf31ff87a44b7b0258040d5365f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b94de6 chore(update): 1.6.9