Add el8toel9 actor to handle directory -> symlink with ruby IRB.

The `/usr/share/ruby/irb/` directory is a symlink in RHEL 9.

Simply remove the directory to then let the RPM mechanism create the
correct symlink on update.

Users should not expect to ever retain anything in this directory.

repos/system_upgrade/el8toel9/actors/registerrubyirbadjustment/actor.py

@@ -0,0 +1,22 @@
+from leapp.actors import Actor
+from leapp.models import DNFWorkaround
+from leapp.tags import FactsPhaseTag, IPUWorkflowTag
+
+
+class RegisterRubyIRBAdjustment(Actor):
+    """
+    Registers a workaround which will adjust the Ruby IRB directories during the upgrade.
+    """
+
+    name = 'register_ruby_irb_adjustment'
+    consumes = ()
+    produces = (DNFWorkaround,)
+    tags = (IPUWorkflowTag, FactsPhaseTag)
+
+    def process(self):
+        self.produce(
+            DNFWorkaround(
+                display_name='IRB directory fix',
+                script_path=self.get_tool_path('handlerubyirbsymlink'),
+            )
+        )

repos/system_upgrade/el8toel9/actors/registerrubyirbadjustment/tests/test_register_ruby_irb_adjustments.py

@@ -0,0 +1,11 @@
+import os.path
+
+from leapp.models import DNFWorkaround
+
+
+def test_register_ruby_irb_adjustments(current_actor_context):
+    current_actor_context.run()
+    assert len(current_actor_context.consume(DNFWorkaround)) == 1
+    assert current_actor_context.consume(DNFWorkaround)[0].display_name == 'ruby irb symlink fix'
+    assert os.path.basename(current_actor_context.consume(DNFWorkaround)[0].script_path) == 'handlerubyirbsymlink'
+    assert os.path.exists(current_actor_context.consume(DNFWorkaround)[0].script_path)

repos/system_upgrade/el8toel9/tools/handlerubyirbsymlink

@@ -0,0 +1,23 @@
+#!/usr/bin/bash -e
+
+# just in case of hidden files.. not sure why would someone do that, it's more
+# like forgotten cache file possibility, but rather do that..
+shopt -s dotglob
+
+handle_dir() {
+    # Check that $1 is not already a symlink
+    # then remove the directory so that RPM can freely create the
+    # symlink.
+    if [ "$(readlink "$1")" == "/usr/share/gems/gems/irb-1.3.5" ]; then
+        return
+    fi
+
+    # There is no configuration or anything that the user should ever customize
+    # and expect to retain.
+    rm -rf "$1"
+
+    return 0
+}
+
+
+handle_dir /usr/share/ruby/irb