comps-wrapper: Report unknown package types

When there is a typo in the comps file, instead of crashing with a
non-descript KeyError we should raise a nice error with details about
the problem.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi/wrappers/comps.py

@@ -88,6 +88,11 @@ class CompsWrapper(object):
 
             packages_by_type = collections.defaultdict(list)
             for pkg in group.packages:
+                if pkg.type == libcomps.PACKAGE_TYPE_UNKNOWN:
+                    raise RuntimeError(
+                        'Failed to process comps file. Package %s in group %s has unknown type'
+                        % (pkg.name, group.id))
+
                 packages_by_type[TYPE_MAPPING[pkg.type]].append(pkg)
 
             for type_name in TYPE_MAPPING.values():

tests/fixtures/comps-typo.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE comps PUBLIC "-//Red Hat, Inc.//DTD Comps info//EN" "comps.dtd">
+<comps>
+  <group>
+    <id>core</id>
+    <name>Core</name>
+    <description>Smallest possible installation</description>
+    <default>true</default>
+    <uservisible>false</uservisible>
+    <packagelist>
+      <packagereq type="mndatory">dummy-bash</packagereq>
+    </packagelist>
+  </group>
+</comps>

tests/test_comps_wrapper.py

@@ -19,6 +19,7 @@ COMPS_FILE = os.path.join(FIXTURE_DIR, 'comps.xml')
 COMPS_FORMATTED_FILE = os.path.join(FIXTURE_DIR, 'comps-formatted.xml')
 COMPS_GROUP_FILE = os.path.join(FIXTURE_DIR, 'comps-group.xml')
 COMPS_ENVIRONMENT_FILE = os.path.join(FIXTURE_DIR, 'comps-env.xml')
+COMPS_FILE_WITH_TYPO = os.path.join(FIXTURE_DIR, 'comps-typo.xml')
 
 
 class CompsWrapperTest(unittest.TestCase):
@@ -77,3 +78,11 @@ class CompsWrapperTest(unittest.TestCase):
         ]
         comps.filter_environments(groups)
         self.assertEqual(groups, [{"name": "minimal", "display_order": 99, "groups": ["core"]}])
+
+    def test_report_typo_in_package_type(self):
+        comps = CompsWrapper(COMPS_FILE_WITH_TYPO)
+        with self.assertRaises(RuntimeError) as ctx:
+            comps.write_comps(target_file=self.file.name)
+        self.assertIn(
+            'Package dummy-bash in group core has unknown type',
+            str(ctx.exception))