Add camtool dumpconfig subcommand.

Fixes http://code.google.com/p/camlistore/issues/detail?id=192

cmd/camtool/dumpconfig.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2011 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"flag"
+	"os"
+
+	"camlistore.org/pkg/cmdmain"
+	"camlistore.org/pkg/osutil"
+	"camlistore.org/pkg/serverconfig"
+)
+
+type dumpconfigCmd struct{}
+
+func init() {
+	cmdmain.RegisterCommand("dumpconfig", func(flags *flag.FlagSet) cmdmain.CommandRunner {
+		return new(dumpconfigCmd)
+	})
+}
+
+func (c *dumpconfigCmd) Describe() string {
+	return "Dump the low-level server config from its simple config."
+}
+
+func (c *dumpconfigCmd) Usage() {
+}
+
+func (c *dumpconfigCmd) RunCommand(args []string) error {
+	var file string
+	switch {
+	case len(args) == 0:
+		file = osutil.UserServerConfigPath()
+	case len(args) == 1:
+		file = args[0]
+	default:
+		return errors.New("More than 1 argument not allowed")
+	}
+	cfg, err := serverconfig.Load(file)
+	if err != nil {
+		return err
+	}
+	ll, err := json.MarshalIndent(cfg.Obj, "", "  ")
+	if err != nil {
+		return err
+	}
+	_, err = os.Stdout.Write(ll)
+	return err
+}