$ git clone -n https://src.fedoraproject.org/rpms/fdk-aac-free.git /var/lib/mock/f31-build-66238-29843/root/chroot_tmpdir/scmroot/fdk-aac-free
Cloning into '/var/lib/mock/f31-build-66238-29843/root/chroot_tmpdir/scmroot/fdk-aac-free'...
$ git reset --hard 28131cdc6f56b13d6eea77d2e1e4ad10e6b71213
HEAD is now at 28131cd - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild