import_and_trust_key errs with gpg 1.4

[symbolboxer]

Environment

• Ruby 2.4.4p296
• IOStreams 1.6.1
• Rails 5.2.3
• GPG 1.4.16

Expected Behavior

• A PGP key generated by IOStreams can be passed as an import_and_trust_key option

Actual Behavior

Error is thrown:

IOStreams::Pgp::Failure:
       GPG Failed trusting key: gpg: error in `[stdin]': invalid fingerprint

I suspect that this happens with any key on GPG 1.4.16. The same key, when passed in as import_and_trust_key on GPG 2.2.4, works without incident.

Pull Request

Coming soon!

[symbolboxer]

I wrote this snippet in order to demonstrate:

key_id = IOStreams::Pgp.generate_key(
  name: 'test key',
  email: 'trust_test@example.com',
  passphrase: 'test'
)
IOStreams::Pgp.set_trust(email: 'trust_test@example.com', key_id: key_id)

But this doesn't appear to work on GPG 2.2.4 because of an unrelated issue where generate_key returns a truncated key ID.

This one, however, works as expected on 2.2.4 and fails on 1.4.16:

email = 'trust_test@example.com'
IOStreams::Pgp.generate_key(
  name: 'test key',
  email: email,
  passphrase: 'test'
)
key_str = IOStreams::Pgp.export(email: email)
IOStreams::Pgp.import_and_trust(key: key_str)