$ git clone -n https://src.fedoraproject.org/rpms/mozjs68.git /var/lib/mock/f33-build-450023-63406/root/chroot_tmpdir/scmroot/mozjs68
Cloning into '/var/lib/mock/f33-build-450023-63406/root/chroot_tmpdir/scmroot/mozjs68'...
$ git reset --hard 853b5800591a4aec1ca3a7a991803b2f64f5037e
HEAD is now at 853b580 Release 68.12.0