make it possible to specify the format in which to retrieve the crl

autoca/ca_tool.py

@@ -51,7 +51,10 @@ def main():
     if cmd == 'get-ca':
         writeout(opts.output, ca.get_ca())
     elif cmd == 'get-crl':
-        writeout(opts.output, ca.get_crl(format='pem'))
+        fmt = 'pem'
+        if args:
+            fmt = args[0].lower()
+        writeout(opts.output, ca.get_crl(format=fmt))
     elif cmd == 'sign':
         if not opts.subject:
             parser.error('Must specify --subject')