Comment 1 for bug 1218438

This appears to be implemented: https://pythonhosted.org/charmhelpers/api/charmhelpers.fetch.html#charmhelpers.fetch.install_remote

The example provided demonstrates SHA-1 verification:

    dest = install_remote('http://example.com/archive.tgz',
          checksum='deadbeef',
          hash_type='sha1')