$ git clone -n https://src.fedoraproject.org/rpms/libmpeg2.git /var/lib/mock/f31-build-59035-28529/root/chroot_tmpdir/scmroot/libmpeg2
Cloning into '/var/lib/mock/f31-build-59035-28529/root/chroot_tmpdir/scmroot/libmpeg2'...
$ git reset --hard 877b556c6f20be480a0972adf97df835dd1220d7
HEAD is now at 877b556 Initial import