$ git clone -n https://src.fedoraproject.org/rpms/gstreamermm.git /var/lib/mock/f31-build-50538-27412/root/chroot_tmpdir/scmroot/gstreamermm
Cloning into '/var/lib/mock/f31-build-50538-27412/root/chroot_tmpdir/scmroot/gstreamermm'...
$ git reset --hard 4e050753c5ea1df5a5778149a052fd1e73248d6a
HEAD is now at 4e05075 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild