Resolve comments after abdger's review

Addressed:
- components_map made global
- dependencies are specified separately for each component
- ternary expressions refactored

Not addressed:
- if no such component/version then this is logged as warning
  with empty list retured (originally an exception was requested,
  but imho that's an overkill, let's discuss though)
- no separate function for dependencies, it's still a parameter
  (also let's discuss)

repos/system_upgrade/common/libraries/rpms.py

@@ -3,6 +3,27 @@
 from leapp.models import InstalledRPM
 
 
+LEAPP_PACKAGES_MAP = {
+        'framework': {'7': {'pkgs': ['leapp', 'python2-leapp'],
+                            'deps': ['leapp-deps']},
+                      '8': {'pkgs': ['leapp', 'python3-leapp'],
+                            'deps': ['leapp-deps']}
+                      },
+        'repository': {'7': {'pkgs': ['leapp-upgrade-el7toel8'],
+                             'deps': ['leapp-upgrade-el7toel8-deps']},
+                       '8': {'pkgs': ['leapp-upgrade-el8toel9'],
+                             'deps': ['leapp-upgrade-el8toel9-deps']}
+                       },
+        'cockpit': {'7': {'pkgs': ['cockpit-leapp']},
+                    '8': {'pkgs': ['cockpit-leapp']}
+                    },
+        'tools': {'7': {'pkgs': ['snactor']},
+                  '8': {'pkgs': ['snactor']}
+                  }
+        }
+LEAPP_DEFAULT_COMPONENTS = ['framework', 'repository', 'tools']
+
+
 def get_installed_rpms():
     rpm_cmd = [
         '/bin/rpm',
@@ -128,23 +149,24 @@ def get_leapp_packages(source_version=None, component=None, include_deps=False):
     :param include_deps: a flag to control whether deps meta packages are to be filtered out.
     """
     res = set()
-    # NOTE(ivasilev) mapping has the format component: {source_version: [pkg1, pkg2, ..]}
-    component_map = {'framework': {'7': ['leapp', 'leapp-deps', 'python2-leapp'],
-                                   '8': ['leapp', 'leapp-deps', 'python3-leapp']},
-                     'repository': {'7': ['leapp-upgrade-el7toel8', 'leapp-upgrade-el7toel8-deps'],
-                                    '8': ['leapp-upgrade-el8toel9', 'leapp-upgrade-el8toel9-deps']},
-                     'snactor': {'7': ['snactor'],
-                                 '8': ['snactor']}}
-    source_versions = [source_version] if isinstance(source_version, str) else (source_version or
-                                                                                [get_source_major_version()])
-    components = [component] if isinstance(component, str) else component or list(component_map.keys())
+    source_versions = [source_version] if isinstance(source_version, str) else source_version
+    if not source_versions:
+        # No source_version of interest specified -> treat as if only current source system version
+        # requested
+        source_versions = [get_source_major_version()]
+    components = [component] if isinstance(component, str) else component
+    if not component:
+        # No component of interest specified -> treat as if packages for all components are requested
+        components = LEAPP_DEFAULT_COMPONENTS
     for comp in components:
         for src_version in source_versions:
             try:
-                res.update(component_map[comp][src_version])
+                res.update(LEAPP_PACKAGES_MAP[comp][src_version].get('pkgs', []))
+                if include_deps:
+                    res.update(LEAPP_PACKAGES_MAP[comp][src_version].get('deps', []))
             except KeyError:
+                stdlib.api.current_logger().warning(
+                        "The requested component {comp} or source_version {ver} is unknown".format(
+                            comp=component, ver=src_version))
                 continue
-    if not include_deps:
-        # filter out deps packages
-        return sorted([pkg for pkg in res if not pkg.endswith('-deps')])
     return sorted(res)