Switch to python and Jinja2 for the dovecot container

dovecot/start.py

@@ -0,0 +1,20 @@
+#!/usr/bin/python
+
+import jinja2
+import os
+import socket
+import glob
+	
+convert = lambda src, dst: open(dst, "w").write(jinja2.Template(open(src).read()).render(**os.environ))
+
+# Actual startup script
+os.environ["FRONT_ADDRESS"] = socket.gethostbyname("front")
+
+for postfix_file in glob.glob("/conf/*.cf"):
+    convert(postfix_file, os.path.join("/etc/postfix", os.path.basename(postfix_file)))
+
+convert("/conf/rsyslog.conf", "/etc/rsyslog.conf")
+
+# Run postfix
+os.system("chown -R mail:mail /mail /var/lib/dovecot")
+os.execv("/usr/sbin/dovecot" ["dovecot", "-c", "/etc/dovecot/dovecot.conf", "-F"])