Allow to directly import EasyConfig constants from the module

This allows e.g. `from easybuild.framework.easyconfig.constants import SYSTEM`
instead of `easyconfig.constants.EASYCONFIG_CONSTANTS['SYSTEM'][0]`

easybuild/framework/easyconfig/constants.py

@@ -82,3 +82,7 @@ def _get_arch_constant():
     'OS_PKG_PAM_DEV': (('pam-devel', 'libpam0g-dev'),
                        "OS packages providing Pluggable Authentication Module (PAM) developement support"),
 }
+
+# Add EasyConfig constants to export list
+globals().update({name: value for name, (value, _) in EASYCONFIG_CONSTANTS.items()})
+__all__ = ['EXTERNAL_MODULE_MARKER', 'EASYCONFIG_CONSTANTS'] + list(EASYCONFIG_CONSTANTS.keys())

test/framework/easyconfig.py

@@ -1278,6 +1278,17 @@ def test_constant_doc(self):
         ]
         self.assertEqual(len(doc.split('\n')), sum([len(temps)] + [len(x) for x in temps]))
 
+    def test_constants_import(self):
+        """Test importing constants works"""
+        # Sanity check that importing an EC constant works as-if using EASYCONFIG_CONSTANTS
+        from easybuild.framework.easyconfig.constants import SYSTEM
+        self.assertEqual(SYSTEM, easyconfig.constants.EASYCONFIG_CONSTANTS['SYSTEM'][0])
+        # Check each individual constant
+        constants = __import__('easybuild.framework.easyconfig.constants', fromlist=[None])
+        for name, (value, doc) in easyconfig.constants.EASYCONFIG_CONSTANTS.items():
+            self.assertTrue(hasattr(constants, name), 'Missing ' + name)
+            self.assertEqual(getattr(constants, name), value)
+
     def test_build_options(self):
         """Test configure/build/install options, both strings and lists."""
         orig_contents = '\n'.join([