PreparePamUserDB: implement db conversion

Check the databases reported by ScanPamUserDB and convert them to GDBM
format. It also includes the component test for the actor.

Signed-off-by: Iker Pedrosa <[email protected]>

repos/system_upgrade/el9toel10/actors/preparepamuserdb/actor.py

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+from leapp.actors import Actor
+from leapp.models import PamUserDbLocation
+from leapp.tags import RPMUpgradePhaseTag, IPUWorkflowTag
+from leapp.libraries.actor import preparepamuserdb
+
+
+class PreparePamUserDb(Actor):
+    """
+    Convert the pam_userdb databases to GDBM
+    """
+
+    name = 'prepare_pam_user_db'
+    consumes = (PamUserDbLocation,)
+    produces = ()
+    tags = (RPMUpgradePhaseTag, IPUWorkflowTag)
+
+    def process(self):
+        preparepamuserdb.process()

repos/system_upgrade/el9toel10/actors/preparepamuserdb/libraries/preparepamuserdb.py

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+import subprocess
+
+from leapp.models import PamUserDbLocation
+from leapp.libraries.stdlib import api
+
+
+def process():
+    for msg in api.consume(PamUserDbLocation):
+        locations = msg.locations
+
+    for location in locations:
+        cmd = f'db_converter --src {location}.db --dest {location}.gdbm'
+        try:
+            subprocess.call(cmd, shell=True)
+        except subprocess.CalledProcessError as e:
+            api.current_logger().debug(
+                f"'{cmd}' returned non-zero exit status: {e.returncode}"
+            )
+            return

repos/system_upgrade/el9toel10/actors/preparepamuserdb/tests/test_preparepamuserdb.py

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+import os
+
+import pytest
+
+from pathlib import Path
+from leapp.models import PamUserDbLocation
+from leapp.libraries.actor import preparepamuserdb
+from leapp.libraries.stdlib import api
+
+CUR_DIR = os.path.dirname(os.path.abspath(__file__))
+
+
+def test_process_locations(current_actor_context):
+    current_actor_context.feed(
+        PamUserDbLocation(
+            locations=[f'{CUR_DIR}/files/db1', f'{CUR_DIR}/files/db2']
+        )
+    )
+    current_actor_context.run()
+    db1 = Path(f'{CUR_DIR}/files/db1.gdbm')
+    assert db1.is_file()
+    db2 = Path(f'{CUR_DIR}/files/db2.gdbm')
+    assert db2.is_file()