tools/test-cloud-meta-mock: add a mock metadata server for cloud-setup

Useful for testing/development.

Makefile.am

@@ -5812,6 +5812,7 @@ EXTRA_DIST += \
 	tools/enums-to-docbook.pl \
 	tools/meson-post-install.sh \
 	tools/run-nm-test.sh \
+	tools/test-cloud-meta-mock.py \
 	tools/test-networkmanager-service.py \
 	tools/test-sudo-wrapper.sh \
 	\

tools/test-cloud-meta-mock.py

@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+
+# run:     $ systemd-socket-activate -l 8000 python tools/test-cloud-meta-mock.py &
+#          $ NM_CLOUD_SETUP_EC2_HOST=http://localhost:8000 \
+#            NM_CLOUD_SETUP_LOG=trace \
+#            NM_CLOUD_SETUP_EC2=yes src/nm-cloud-setup/nm-cloud-setup
+# or just: $ python tools/test-cloud-meta-mock.py
+
+import os
+import socket
+
+from http.server import HTTPServer
+from http.server import BaseHTTPRequestHandler
+from socketserver import BaseServer
+
+
+class MockCloudMDRequestHandler(BaseHTTPRequestHandler):
+    """
+    Respond to cloud metadata service requests.
+    Currently implements a fairly minimal subset of AWS EC2 API.
+    """
+
+    _ec2_macs = "/2018-09-24/meta-data/network/interfaces/macs/"
+    _meta_resources = {
+        "/latest/meta-data/": b"ami-id\n",
+        _ec2_macs: b"9e:c0:3e:92:24:2d\n53:e9:7e:52:8d:a8",
+        _ec2_macs + "9e:c0:3e:92:24:2d/subnet-ipv4-cidr-block": b"172.31.16.0/20",
+        _ec2_macs + "9e:c0:3e:92:24:2d/local-ipv4s": b"172.31.26.249",
+        _ec2_macs + "53:e9:7e:52:8d:a8/subnet-ipv4-cidr-block": b"172.31.166.0/20",
+        _ec2_macs + "53:e9:7e:52:8d:a8/local-ipv4s": b"172.31.176.249",
+    }
+
+    def log_message(self, format, *args):
+        pass
+
+    def do_GET(self):
+        if self.path in self._meta_resources:
+            self.send_response(200)
+            self.end_headers()
+            self.wfile.write(self._meta_resources[self.path])
+        else:
+            self.send_response(404)
+            self.end_headers()
+
+    def do_PUT(self):
+        if self.path == "/latest/api/token":
+            self.send_response(200)
+            self.end_headers()
+            self.wfile.write(
+                b"AQAAALH-k7i18JMkK-ORLZQfAa7nkNjQbKwpQPExNHqzk1oL_7eh-A=="
+            )
+        else:
+            self.send_response(404)
+            self.end_headers()
+
+
+class SocketHTTPServer(HTTPServer):
+    """
+    A HTTP server that accepts a socket (that has already been
+    listen()-ed on). This is useful when the socket is passed
+    fron the test runner.
+    """
+
+    def __init__(self, server_address, RequestHandlerClass, socket):
+        BaseServer.__init__(self, server_address, RequestHandlerClass)
+        self.socket = socket
+        self.server_address = self.socket.getsockname()
+
+
+# See sd_listen_fds(3)
+fileno = os.getenv("LISTEN_FDS")
+if fileno is not None:
+    if fileno != "1":
+        raise Exception("Bad LISTEN_FDS")
+    s = socket.socket(fileno=3)
+else:
+    addr = ("localhost", 0)
+    s = socket.socket()
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
+    s.bind(addr)
+
+
+httpd = SocketHTTPServer(None, MockCloudMDRequestHandler, socket=s)
+
+print("Listening on http://%s:%d" % (httpd.server_address[0], httpd.server_address[1]))
+httpd.server_activate()
+
+httpd.serve_forever()
+httpd.server_close()