$ git clone -n https://src.fedoraproject.org/rpms/gstreamermm.git /var/lib/mock/f41-build-778296-13541/root/chroot_tmpdir/scmroot/gstreamermm
Cloning into '/var/lib/mock/f41-build-778296-13541/root/chroot_tmpdir/scmroot/gstreamermm'...
$ git fetch origin 5089fd9d5ae678c2cc7b28d343592812fc865ca8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamermm
 * [new ref]         5089fd9d5ae678c2cc7b28d343592812fc865ca8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5089fd9 Disable mingw in Flatpak builds