De-duplicate not needed certifications by cleaning the keyring after
import to remove old files when processing revocations. This basically
adds the functionality compared to import-clean.
Declare the whole keyring data as well as the code as input dependency
for the build target. This way we can properly depend on the build
target for installation without forcing rebuilding on every invocation.
A rebuild will be triggered if either the keyring or the source code
creating the build output changes.
The directories are added to the source dependencies on purpose to
guarantee that changes like deleted files will result in a rebuild.
The mtime of the build directory is force updated on every run to allow
make to track the output artifacts mtime compared against the
dependencies.
libkeyringctl/keyring.py:
Simplify `convert_certificate()` by splitting out the conversion of
signature packets to `convert_signature_packet()` and the persistence of
packet material to `persist_key_material()`.
Add `convert_pubkey_signature_packet()`,
`convert_uid_signature_packet()` and
`convert_subkey_signature_packet()` to deal with the conversion of
public key signatures, UID signatures and subkey signatures
(respectively).
tests/test_keyring.py:
Add tests for `convert_certificate()`, `convert_signature_packet()`,
`convert_{pubkey,uid,subkey}_signature_packet()` and
`persist_subkey_revocations()`.
libkeyringctl/keyring.py:
Change `get_packets_from_path()` to use full conditional statements
which is easier to cover in tests.
tests/test_keyring.py:
Add simple tests for `get_packets_from_path()`,
`get_packets_from_listing()`, `export()` and `build()`.
tests/test_keyring.py:
Add tests for `is_pgp_fingerprint()`,
`transform_{fingerprint,username}_to_keyring_path()`,
`derive_username_from_fingerprint()` and get_fingerprints_from_paths()`.
tests/conftest.py:
Add `valid_fingerprint()` and `valid_subkey_fingerprint()` fixtures to
produce a generic "valid" PGP fingerprint string.
Add the `invalid_fingerprint()` fixture to generate a set of "invalid"
fingerprint strings.
