$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-base.git /var/lib/mock/f40-build-2246450-53816/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base
Cloning into '/var/lib/mock/f40-build-2246450-53816/root/chroot_tmpdir/scmroot/gstreamer1-plugins-base'...
$ git fetch origin 9104f264e59fcfea228bc6c425c9f88f32813590:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-base
 * [new ref]         9104f264e59fcfea228bc6c425c9f88f32813590 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9104f26 1.22.8