Add instructions and script for converting compose to k8.

compose/k8/convert.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+
+# Install kompose (e.g. brew install kompose).
+# Install minikube (e.g. brew install minikube).
+# $ minikube start  # Build a k8 cluster in a VM.
+# $ eval $(minikube docker-env) # Target Docker commands at the VM's Docker host.
+# $ cd ..; bash buildlocal.sh; cd k8 # Build Docker containers required for k8 setup.
+# $ python convert.py  # Execute this wrapper around kompose to build native k8 artifacts.
+
+import os
+import subprocess
+import yaml
+
+DIRECTORY = os.path.abspath(os.path.dirname(__file__))
+COMPOSE_TARGET = os.path.abspath(os.path.join(DIRECTORY, "..", "docker-compose.yml"))
+KOMPOSE_TARGET = os.path.join(DIRECTORY, "docker-compose-for-kompose.yml")
+
+
+def main():
+    with open(COMPOSE_TARGET, "r") as f:
+        raw_compose_def = yaml.load(f)
+
+    _hack_for_kompose(raw_compose_def)
+    with open(KOMPOSE_TARGET, "w") as f:
+        yaml.dump(raw_compose_def, f)
+
+    subprocess.check_call(["kompose", "-f", KOMPOSE_TARGET, "convert"])
+
+
+def _hack_for_kompose(raw_compose_def):
+    ftp_ports = raw_compose_def["services"]["proftpd"]["ports"]
+    del ftp_ports[2]
+    for i in range(10):
+        # Replace "30000-30010:30000-30010" with individual entries.
+        ftp_ports.append("%d:%d" % (30000 + i, 30000 + i))
+
+
+if __name__ == "__main__":
+    main()