Avoid processing the same EasyConfig multiple times

easybuild/framework/easyconfig/tools.py

@@ -404,9 +404,15 @@ def parse_easyconfigs(paths, validate=True):
     """
     easyconfigs = []
     generated_ecs = False
+    parsed_paths = []
 
     for (path, generated) in paths:
+        # Avoid processing the same file multiple times
         path = os.path.abspath(path)
+        if any(os.path.samefile(path, p) for p in parsed_paths):
+            continue
+        parsed_paths.append(path)
+
         # keep track of whether any files were generated
         generated_ecs |= generated
         if not os.path.exists(path):

test/framework/easyconfig.py

@@ -737,6 +737,32 @@ def test_tweaking(self):
         # cleanup
         os.remove(tweaked_fn)
 
+    def test_parse_easyconfig(self):
+        """Test parse_easyconfig function"""
+        self.contents = textwrap.dedent("""
+            easyblock = "ConfigureMake"
+            name = "PI"
+            version = "3.14"
+            homepage = "http://example.com"
+            description = "test easyconfig"
+            toolchain = SYSTEM
+        """)
+        self.prep()
+        ecs, gen_ecs = parse_easyconfigs([(self.eb_file, False)])
+        self.assertEqual(len(ecs), 1)
+        self.assertEqual(ecs[0]['spec'], self.eb_file)
+        self.assertIsInstance(ecs[0]['ec'], EasyConfig)
+        self.assertFalse(gen_ecs)
+        # Passing the same EC multiple times is ignored
+        ecs, gen_ecs = parse_easyconfigs([(self.eb_file, False), (self.eb_file, False)])
+        self.assertEqual(len(ecs), 1)
+        # Similar for symlinks
+        linked_ec = os.path.join(self.test_prefix, 'linked.eb')
+        os.symlink(self.eb_file, linked_ec)
+        ecs, gen_ecs = parse_easyconfigs([(self.eb_file, False), (linked_ec, False)])
+        self.assertEqual(len(ecs), 1)
+        self.assertEqual(ecs[0]['spec'], self.eb_file)
+
     def test_alt_easyconfig_paths(self):
         """Test alt_easyconfig_paths function that collects list of additional paths for easyconfig files."""