environment modifications : permit to pass parameters along with file to be sourced (#1626)

lib/spack/spack/environment.py

@@ -271,8 +271,12 @@ def from_sourcing_files(*args, **kwargs):
 
         env = EnvironmentModifications()
         # Check if the files are actually there
-        if not all(os.path.isfile(file) for file in args):
-            raise RuntimeError('trying to source non-existing files')
+        files = [line.split(' ')[0] for line in args]
+        non_existing = [file for file in files if not os.path.isfile(file)]
+        if non_existing:
+            message = 'trying to source non-existing files\n'
+            message += '\n'.join(non_existing)
+            raise RuntimeError(message)
         # Relevant kwd parameters and formats
         info = dict(kwargs)
         info.setdefault('shell', '/bin/bash')

lib/spack/spack/test/data/sourceme_parameters.sh

+#!/usr/bin/env bash
+
+if [[ "$1" == "intel64" ]] ; then
+    export FOO='intel64'
+else
+    export FOO='default'
+fi
\ No newline at end of file

lib/spack/spack/test/environment.py

@@ -119,7 +119,8 @@ def test_source_files(self):
                             'spack', 'test', 'data')
         files = [
             join_path(datadir, 'sourceme_first.sh'),
-            join_path(datadir, 'sourceme_second.sh')
+            join_path(datadir, 'sourceme_second.sh'),
+            join_path(datadir, 'sourceme_parameters.sh intel64')
         ]
         env = EnvironmentModifications.from_sourcing_files(*files)
         modifications = env.group_by_name()
@@ -134,6 +135,11 @@ def test_source_files(self):
         self.assertEqual(len(modifications['NEW_VAR']), 1)
         self.assertTrue(isinstance(modifications['NEW_VAR'][0], SetEnv))
         self.assertEqual(modifications['NEW_VAR'][0].value, 'new')
+
+        self.assertEqual(len(modifications['FOO']), 1)
+        self.assertTrue(isinstance(modifications['FOO'][0], SetEnv))
+        self.assertEqual(modifications['FOO'][0].value, 'intel64')
+
         # Unset variables
         self.assertEqual(len(modifications['EMPTY_PATH_LIST']), 1)
         self.assertTrue(isinstance(