$ git clone -n https://src.fedoraproject.org/rpms/calibre.git /var/lib/mock/f33-build-342012-58673/root/chroot_tmpdir/scmroot/calibre
Cloning into '/var/lib/mock/f33-build-342012-58673/root/chroot_tmpdir/scmroot/calibre'...
$ git reset --hard d51bee1c946de07c436f253b24df1c26bfedbf58
HEAD is now at d51bee1 Update to 4.22.0. Use bundled mathjax for now until fedora moves to 3.0.0