$ git clone -n https://src.fedoraproject.org/rpms/cbootimage.git /var/lib/mock/f31-build-56660-28239/root/chroot_tmpdir/scmroot/cbootimage
Cloning into '/var/lib/mock/f31-build-56660-28239/root/chroot_tmpdir/scmroot/cbootimage'...
$ git reset --hard bfbb22a991cbe3d1c8cfec471c6c2b6cd410f1cc
HEAD is now at bfbb22a - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild