$ git clone -n https://src.fedoraproject.org/rpms/ghc-cassava.git /var/lib/mock/f31-build-54120-27957/root/chroot_tmpdir/scmroot/ghc-cassava
Cloning into '/var/lib/mock/f31-build-54120-27957/root/chroot_tmpdir/scmroot/ghc-cassava'...
$ git reset --hard c20a10d054d68dc452dabdc6ac28538c0cfbe3fa
HEAD is now at c20a10d need text-short but not bytestring-builder