go-ipfs-config: move serialize package to config

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>

config/serialize/serialize.go

@@ -0,0 +1,71 @@
+package fsrepo
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/ipfs/go-ipfs/repo/config"
+
+	"gx/ipfs/QmPdKqUcHGFdeSpvjVoaTRPPstGif9GBZb5Q56RVw9o69A/go-ipfs-util"
+	"gx/ipfs/QmdYwCmx8pZRkzdcd8MhmLJqYVoVTC1aGsy5Q4reMGLNLg/atomicfile"
+)
+
+// ReadConfigFile reads the config from `filename` into `cfg`.
+func ReadConfigFile(filename string, cfg interface{}) error {
+	f, err := os.Open(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	if err := json.NewDecoder(f).Decode(cfg); err != nil {
+		return fmt.Errorf("failure to decode config: %s", err)
+	}
+	return nil
+}
+
+// WriteConfigFile writes the config from `cfg` into `filename`.
+func WriteConfigFile(filename string, cfg interface{}) error {
+	err := os.MkdirAll(filepath.Dir(filename), 0775)
+	if err != nil {
+		return err
+	}
+
+	f, err := atomicfile.New(filename, 0660)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return encode(f, cfg)
+}
+
+// encode configuration with JSON
+func encode(w io.Writer, value interface{}) error {
+	// need to prettyprint, hence MarshalIndent, instead of Encoder
+	buf, err := config.Marshal(value)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(buf)
+	return err
+}
+
+// Load reads given file and returns the read config, or error.
+func Load(filename string) (*config.Config, error) {
+	// if nothing is there, fail. User must run 'ipfs init'
+	if !util.FileExists(filename) {
+		return nil, errors.New("ipfs not initialized, please run 'ipfs init'")
+	}
+
+	var cfg config.Config
+	err := ReadConfigFile(filename, &cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	return &cfg, err
+}

config/serialize/serialize_test.go

@@ -0,0 +1,37 @@
+package fsrepo
+
+import (
+	"os"
+	"runtime"
+	"testing"
+
+	config "github.com/ipfs/go-ipfs/repo/config"
+)
+
+func TestConfig(t *testing.T) {
+	const filename = ".ipfsconfig"
+	cfgWritten := new(config.Config)
+	cfgWritten.Identity.PeerID = "faketest"
+
+	err := WriteConfigFile(filename, cfgWritten)
+	if err != nil {
+		t.Fatal(err)
+	}
+	cfgRead, err := Load(filename)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cfgWritten.Identity.PeerID != cfgRead.Identity.PeerID {
+		t.Fatal()
+	}
+	st, err := os.Stat(filename)
+	if err != nil {
+		t.Fatalf("cannot stat config file: %v", err)
+	}
+
+	if runtime.GOOS != "windows" { // see https://golang.org/src/os/types_windows.go
+		if g := st.Mode().Perm(); g&0117 != 0 {
+			t.Fatalf("config file should not be executable or accessible to world: %v", g)
+		}
+	}
+}