net: Depend on iproute2's ip instead of net-tools ifconfig or route

The net-tools package is deprecated and will eventually be dropped.  Use
"ip route", "link" or "address" instead of "ifconfig" or "route" calls.
Cloud-init can now run in an environment that no longer has net-tools.
This affects the network and route printing emitted to
cloud-config-output.log as well as the cc_disable_ec2_metadata module.

Additional changes:
 - separate readResource and resourceLocation into standalone test
   functions
 - Fix ipv4 address rows to report scopes represented by ip addr show
 - Formatted route/address ouput now handles multiple ipv4 and ipv6
   addresses on a single interface

Co-authored-by: James Hogarth <james.hogarth@gmail.com>
Co-authored-by: Robert Schweikert <rjschwei@suse.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/cloudinit/config/tests/test_disable_ec2_metadata.py b/cloudinit/config/tests/test_disable_ec2_metadata.py
new file mode 100644
index 00000000..67646b03
--- /dev/null
+++ b/cloudinit/config/tests/test_disable_ec2_metadata.py
@@ -0,0 +1,50 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+
+"""Tests cc_disable_ec2_metadata handler"""
+
+import cloudinit.config.cc_disable_ec2_metadata as ec2_meta
+
+from cloudinit.tests.helpers import CiTestCase, mock
+
+import logging
+
+LOG = logging.getLogger(__name__)
+
+DISABLE_CFG = {'disable_ec2_metadata': 'true'}
+
+
+class TestEC2MetadataRoute(CiTestCase):
+
+    with_logs = True
+
+    @mock.patch('cloudinit.config.cc_disable_ec2_metadata.util.which')
+    @mock.patch('cloudinit.config.cc_disable_ec2_metadata.util.subp')
+    def test_disable_ifconfig(self, m_subp, m_which):
+        """Set the route if ifconfig command is available"""
+        m_which.side_effect = lambda x: x if x == 'ifconfig' else None
+        ec2_meta.handle('foo', DISABLE_CFG, None, LOG, None)
+        m_subp.assert_called_with(
+            ['route', 'add', '-host', '169.254.169.254', 'reject'],
+            capture=False)
+
+    @mock.patch('cloudinit.config.cc_disable_ec2_metadata.util.which')
+    @mock.patch('cloudinit.config.cc_disable_ec2_metadata.util.subp')
+    def test_disable_ip(self, m_subp, m_which):
+        """Set the route if ip command is available"""
+        m_which.side_effect = lambda x: x if x == 'ip' else None
+        ec2_meta.handle('foo', DISABLE_CFG, None, LOG, None)
+        m_subp.assert_called_with(
+            ['ip', 'route', 'add', 'prohibit', '169.254.169.254'],
+            capture=False)
+
+    @mock.patch('cloudinit.config.cc_disable_ec2_metadata.util.which')
+    @mock.patch('cloudinit.config.cc_disable_ec2_metadata.util.subp')
+    def test_disable_no_tool(self, m_subp, m_which):
+        """Log error when neither route nor ip commands are available"""
+        m_which.return_value = None  # Find neither ifconfig nor ip
+        ec2_meta.handle('foo', DISABLE_CFG, None, LOG, None)
+        self.assertEqual(
+            [mock.call('ip'), mock.call('ifconfig')], m_which.call_args_list)
+        m_subp.assert_not_called()
+
+# vi: ts=4 expandtab