Implements repository initialization with default config

Modified init command to receive default configuration from stdin. The changes enable us to use existing key-pair, datastore configuration while initializing new ipfs node.

License: MIT
Signed-off-by: Sivachandran <sivachandran.p@gmail.com>

cmd/ipfs/init.go

 package main
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -30,7 +31,9 @@ at ~/.ipfs. To change the repo location, set the $IPFS_PATH environment variable
     export IPFS_PATH=/path/to/ipfsrepo
 `,
 	},
-
+	Arguments: []cmds.Argument{
+		cmds.FileArg("default-config", false, false, "Initialize with the given configuration.").EnableStdin(),
+	},
 	Options: []cmds.Option{
 		cmds.IntOption("bits", "b", fmt.Sprintf("Number of bits to use in the generated RSA private key (defaults to %d)", nBitsForKeypairDefault)),
 		cmds.BoolOption("empty-repo", "e", "Don't add and pin help files to the local storage."),
@@ -77,7 +80,24 @@ at ~/.ipfs. To change the repo location, set the $IPFS_PATH environment variable
 			nBitsForKeypair = nBitsForKeypairDefault
 		}
 
-		if err := doInit(os.Stdout, req.InvocContext().ConfigRoot, empty, nBitsForKeypair); err != nil {
+		var conf *config.Config
+
+		f := req.Files()
+		if f != nil {
+			confFile, err := f.NextFile()
+			if err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+
+			conf = &config.Config{}
+			if err := json.NewDecoder(confFile).Decode(conf); err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+		}
+
+		if err := doInit(os.Stdout, req.InvocContext().ConfigRoot, empty, nBitsForKeypair, conf); err != nil {
 			res.SetError(err, cmds.ErrNormal)
 			return
 		}
@@ -89,10 +109,10 @@ Reinitializing would overwrite your keys.
 `)
 
 func initWithDefaults(out io.Writer, repoRoot string) error {
-	return doInit(out, repoRoot, false, nBitsForKeypairDefault)
+	return doInit(out, repoRoot, false, nBitsForKeypairDefault, nil)
 }
 
-func doInit(out io.Writer, repoRoot string, empty bool, nBitsForKeypair int) error {
+func doInit(out io.Writer, repoRoot string, empty bool, nBitsForKeypair int, conf *config.Config) error {
 	if _, err := fmt.Fprintf(out, "initializing ipfs node at %s\n", repoRoot); err != nil {
 		return err
 	}
@@ -105,9 +125,12 @@ func doInit(out io.Writer, repoRoot string, empty bool, nBitsForKeypair int) err
 		return errRepoExists
 	}
 
-	conf, err := config.Init(out, nBitsForKeypair)
-	if err != nil {
-		return err
+	if conf == nil {
+		var err error
+		conf, err = config.Init(out, nBitsForKeypair)
+		if err != nil {
+			return err
+		}
 	}
 
 	if err := fsrepo.Init(repoRoot, conf); err != nil {

test/sharness/t0022-init-default.sh

+#!/bin/sh
+#
+# Copyright (c) 2014 Christian Couder
+# MIT Licensed; see the LICENSE file in this repository.
+#
+
+test_description="Test init command with default config"
+
+. lib/test-lib.sh
+
+cfg_key="Addresses.API"
+cfg_val="/ip4/0.0.0.0/tcp/5001"
+
+# test that init succeeds
+test_expect_success "ipfs init succeeds" '
+	export IPFS_PATH="$(pwd)/.ipfs" &&
+	echo "IPFS_PATH: \"$IPFS_PATH\"" &&
+	BITS="2048" &&
+	ipfs init --bits="$BITS" >actual_init ||
+	test_fsh cat actual_init
+'
+
+test_expect_success ".ipfs/config has been created" '
+	test -f "$IPFS_PATH"/config ||
+	test_fsh ls -al .ipfs
+'
+
+test_expect_success "ipfs config succeeds" '
+	ipfs config $cfg_flags "$cfg_key" "$cfg_val"
+'
+
+test_expect_success "ipfs read config succeeds" '
+    IPFS_DEFAULT_CONFIG=$(cat "$IPFS_PATH"/config)
+'
+
+test_expect_success "clean up ipfs dir" '
+	rm -rf "$IPFS_PATH"
+'
+
+test_expect_success "ipfs init default config succeeds" '
+	echo $IPFS_DEFAULT_CONFIG | ipfs init >actual_init ||
+	test_fsh cat actual_init
+'
+
+test_expect_success "ipfs config output looks good" '
+	echo "$cfg_val" >expected &&
+	ipfs config "$cfg_key" >actual &&
+	test_cmp expected actual
+'
+
+test_launch_ipfs_daemon
+
+test_kill_ipfs_daemon
+
+test_done