fix(kubernetes): temporary solution for updated k8s python client

kubernetes/base/config/exec_provider.py

@@ -0,0 +1,107 @@
+# Copyright 2018 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import json
+import os
+import subprocess
+import sys
+
+from .config_exception import ConfigException
+
+
+class ExecProvider(object):
+    """
+    Implementation of the proposal for out-of-tree client
+    authentication providers as described here --
+    https://github.com/kubernetes/community/blob/master/contributors/design-proposals/auth/kubectl-exec-plugins.md
+
+    Missing from implementation:
+
+    * TLS cert support
+    * caching
+    """
+
+    def __init__(self, exec_config, cwd, cluster=None):
+        """
+        exec_config must be of type ConfigNode because we depend on
+        safe_get(self, key) to correctly handle optional exec provider
+        config parameters.
+        """
+        for key in ['command', 'apiVersion']:
+            if key not in exec_config:
+                raise ConfigException(
+                    'exec: malformed request. missing key \'%s\'' % key)
+        self.api_version = exec_config['apiVersion']
+        self.args = [exec_config['command']]
+        if exec_config.safe_get('args'):
+            self.args.extend(exec_config['args'])
+        self.env = os.environ.copy()
+        if exec_config.safe_get('env'):
+            additional_vars = {}
+            for item in exec_config['env']:
+                name = item['name']
+                value = item['value']
+                additional_vars[name] = value
+            self.env.update(additional_vars)
+        if exec_config.safe_get('provideClusterInfo'):
+            self.cluster = cluster
+        else:
+            self.cluster = None
+        self.cwd = cwd or None
+
+    def run(self, previous_response=None):
+        is_interactive = hasattr(sys.stdout, 'isatty') and sys.stdout.isatty()
+        kubernetes_exec_info = {
+            'apiVersion': self.api_version,
+            'kind': 'ExecCredential',
+            'spec': {
+                'interactive': is_interactive
+            }
+        }
+        if previous_response:
+            kubernetes_exec_info['spec']['response'] = previous_response
+        if self.cluster:
+            kubernetes_exec_info['spec']['cluster'] = self.cluster
+
+        self.env['KUBERNETES_EXEC_INFO'] = json.dumps(kubernetes_exec_info)
+        process = subprocess.Popen(
+            self.args,
+            stdout=subprocess.PIPE,
+            stderr=sys.stderr if is_interactive else subprocess.PIPE,
+            stdin=sys.stdin if is_interactive else None,
+            cwd=self.cwd,
+            env=self.env,
+            universal_newlines=True,
+            shell=True)
+        (stdout, stderr) = process.communicate()
+        exit_code = process.wait()
+        if exit_code != 0:
+            msg = 'exec: process returned %d' % exit_code
+            stderr = stderr.strip()
+            if stderr:
+                msg += '. %s' % stderr
+            raise ConfigException(msg)
+        try:
+            data = json.loads(stdout)
+        except ValueError as de:
+            raise ConfigException(
+                'exec: failed to decode process output: %s' % de)
+        for key in ('apiVersion', 'kind', 'status'):
+            if key not in data:
+                raise ConfigException(
+                    'exec: malformed response. missing key \'%s\'' % key)
+        if data['apiVersion'] != self.api_version:
+            raise ConfigException(
+                'exec: plugin api version %s does not match %s' %
+                (data['apiVersion'], self.api_version))
+        return data['status']