Avoid crash in check mode (#243)

* Do not let AnsibleModule crash when setting permissions on not yet existing files in check mode.

* Add tests.

* Fix bugs.

plugins/module_utils/crypto/support.py

@@ -371,6 +371,8 @@ class OpenSSLObject(object):
 
         def _check_perms(module):
             file_args = module.load_file_common_arguments(module.params)
+            if module.check_file_absent_if_check_mode(file_args['path']):
+                return False
             return not module.set_fs_attributes_if_different(file_args, False)
 
         if not perms_required:

plugins/module_utils/io.py

@@ -92,7 +92,8 @@ def write_file(module, content, default_mode=None, path=None):
         # Move tempfile to final destination
         module.atomic_move(tmp_name, file_args['path'])
         # Try to update permissions again
-        module.set_fs_attributes_if_different(file_args, False)
+        if not module.check_file_absent_if_check_mode(file_args['path']):
+            module.set_fs_attributes_if_different(file_args, False)
     except Exception as e:
         try:
             os.remove(tmp_name)

plugins/module_utils/openssh/backends/keypair_backend.py

@@ -207,6 +207,8 @@ class KeypairBackend(object):
         file_args = self.module.load_file_common_arguments(self.module.params)
         if public_key:
             file_args['path'] = file_args['path'] + '.pub'
+        if self.module.check_file_absent_if_check_mode(file_args['path']):
+            return True
         return self.module.set_fs_attributes_if_different(file_args, False)
 
     @property