tests: fix permission issue in external module

Author: gsmolk

tests/external.py

@@ -1742,6 +1742,7 @@ def test_external_dir_contain_symlink_on_file(self):
         # create symlink to directory in external directory
         src_file = os.path.join(symlinked_dir, 'postgresql.conf')
         os.mkdir(external_dir)
+        os.chmod(external_dir, 0700)
         os.symlink(src_file, file_in_external_dir)
 
         # FULL backup with external directories
@@ -2119,6 +2120,7 @@ def test_restore_external_dir_is_empty(self):
         # create empty file in external directory
         # open(os.path.join(external_dir, 'file'), 'a').close()
         os.mkdir(external_dir)
+        os.chmod(external_dir, 0700)
         with open(os.path.join(external_dir, 'file'), 'w+') as f:
             f.close()
 
@@ -2184,6 +2186,7 @@ def test_merge_external_dir_is_empty(self):
         # create empty file in external directory
         # open(os.path.join(external_dir, 'file'), 'a').close()
         os.mkdir(external_dir)
+        os.chmod(external_dir, 0700)
         with open(os.path.join(external_dir, 'file'), 'w+') as f:
             f.close()
 
@@ -2252,10 +2255,12 @@ def test_restore_external_dir_string_order(self):
 
         # create empty file in external directory
         os.mkdir(external_dir_1)
+        os.chmod(external_dir_1, 0700)
         with open(os.path.join(external_dir_1, 'fileA'), 'w+') as f:
             f.close()
 
         os.mkdir(external_dir_2)
+        os.chmod(external_dir_2, 0700)
         with open(os.path.join(external_dir_2, 'fileZ'), 'w+') as f:
             f.close()
 
@@ -2332,10 +2337,12 @@ def test_merge_external_dir_string_order(self):
 
         # create empty file in external directory
         os.mkdir(external_dir_1)
+        os.chmod(external_dir_1, 0700)
         with open(os.path.join(external_dir_1, 'fileA'), 'w+') as f:
             f.close()
 
         os.mkdir(external_dir_2)
+        os.chmod(external_dir_2, 0700)
         with open(os.path.join(external_dir_2, 'fileZ'), 'w+') as f:
             f.close()