Fix issues introduced by removing python-gnupg

Restore python-gnupg to functional tests only - not worth trying to
replace this fixture like-for-like

Fix an issue with inlined signatures. We should only parse the sig
separately in the detached case.

(cherry picked from commit ac64ff3)

Author: dralley

functest_requirements.txt

@@ -1,7 +1,7 @@
 pytest<10
 pytest-custom_exit_code
 pytest-xdist
-pysequoia
+python-gnupg
 proxy.py~=2.4.10
 trustme~=1.2.1
 

pulpcore/app/util.py

@@ -439,8 +439,8 @@ def store(key_ids):
             sig_data = signature.read()
 
     try:
-        sig = Sig.from_bytes(sig_data)
         if detached_data is not None:
+            sig = Sig.from_bytes(sig_data)
             result = verify(file=detached_data, store=store, signature=sig)
         else:
             result = verify(bytes=sig_data, store=store)

pulpcore/pytest_plugin.py

@@ -1,5 +1,6 @@
 import aiohttp
 import asyncio
+import gnupg
 import json
 import os
 import pathlib
@@ -1147,21 +1148,6 @@ def _sign_with_ascii_armored_detached_signing_service(filename):
     return _sign_with_ascii_armored_detached_signing_service
 
 
-class _GpgCompat:
-    """Wrapper around a pysequoia Cert that provides the python-gnupg GPG interface needed by
-    downstream plugins (e.g. pulp_container) which access .gnupghome and .export_keys()."""
-
-    def __init__(self, cert, gnupghome):
-        self.cert = cert
-        self.gnupghome = gnupghome
-
-    def export_keys(self, keyids=None):
-        return str(self.cert)
-
-    def __str__(self):
-        return str(self.cert)
-
-
 @pytest.fixture(scope="session")
 def signing_gpg_metadata(signing_gpg_homedir_path):
     """A fixture that returns a GPG instance and related metadata (i.e., fingerprint, keyid)."""
@@ -1177,37 +1163,22 @@ def signing_gpg_metadata(signing_gpg_homedir_path):
         with suppress(FileNotFoundError, PermissionError):
             key_file.write_text(private_key_data)
 
-    from pysequoia import Cert
+    gpg = gnupg.GPG(gnupghome=signing_gpg_homedir_path)
+    gpg.import_keys(private_key_data)
 
-    cert = Cert.from_bytes(private_key_data.encode())
-    fingerprint = cert.fingerprint.upper()
-    keyid = fingerprint[-16:]
-
-    gpg_cmd = ["gpg", "--homedir", str(signing_gpg_homedir_path)]
-    subprocess.run(
-        gpg_cmd + ["--import"],
-        input=private_key_data,
-        capture_output=True,
-        text=True,
-        check=True,
-    )
-    subprocess.run(
-        gpg_cmd + ["--import-ownertrust"],
-        input=f"{fingerprint}:6:\n",
-        capture_output=True,
-        text=True,
-        check=True,
-    )
+    key = gpg.list_keys()[0]
+    fingerprint = key["fingerprint"]
+    keyid = key["keyid"]
 
-    gpg = _GpgCompat(cert, str(signing_gpg_homedir_path))
+    gpg.trust_keys(fingerprint, "TRUST_ULTIMATE")
     return gpg, fingerprint, keyid
 
 
 @pytest.fixture(scope="session")
 def pulp_trusted_public_key(signing_gpg_metadata):
     """Fixture to extract the ascii armored trusted public test key."""
     gpg, _, keyid = signing_gpg_metadata
-    return str(gpg)
+    return gpg.export_keys([keyid])
 
 
 @pytest.fixture(scope="session")
@@ -1223,7 +1194,7 @@ def _ascii_armored_detached_signing_service_name(
     signing_gpg_homedir_path,
 ):
     service_name = str(uuid.uuid4())
-    _, fingerprint, keyid = signing_gpg_metadata
+    _gpg, fingerprint, _keyid = signing_gpg_metadata
 
     cmd = (
         "pulpcore-manager",