init_dir: use masterkey arg

cli_args.go

@@ -280,7 +280,7 @@ func parseCliOpts(osArgs []string) (args argContainer) {
 		tlog.Fatal.Printf("The options -passfile and -masterkey cannot be used at the same time")
 		os.Exit(exitcodes.Usage)
 	}
-	if len(args.extpass) > 0 && args.masterkey != "" {
+	if len(args.extpass) > 0 && args.masterkey != "" && !args.init {
 		tlog.Fatal.Printf("The options -extpass and -masterkey cannot be used at the same time")
 		os.Exit(exitcodes.Usage)
 	}

init_dir.go

@@ -108,6 +108,7 @@ func initDir(args *argContainer) {
 			DeterministicNames: args.deterministic_names,
 			XChaCha20Poly1305:  args.xchacha,
 			LongNameMax:        args.longnamemax,
+			Masterkey:          handleArgsMasterkey(args),
 		})
 		if err != nil {
 			tlog.Fatal.Println(err)

internal/configfile/config_file.go

@@ -74,6 +74,7 @@ type CreateArgs struct {
 	DeterministicNames bool
 	XChaCha20Poly1305  bool
 	LongNameMax        uint8
+	Masterkey          []byte
 }
 
 // Create - create a new config with a random key encrypted with
@@ -126,8 +127,11 @@ func Create(args *CreateArgs) error {
 		return err
 	}
 	{
-		// Generate new random master key
-		key := cryptocore.RandBytes(cryptocore.KeyLen)
+		key := args.Masterkey
+		if key == nil {
+			// Generate new random master key
+			key = cryptocore.RandBytes(cryptocore.KeyLen)
+		}
 		tlog.PrintMasterkeyReminder(key)
 		// Encrypt it using the password
 		// This sets ScryptObject and EncryptedKey

tests/cli/cli_test.go

@@ -2,6 +2,8 @@
 package cli
 
 import (
+	"bytes"
+	"encoding/hex"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -97,6 +99,19 @@ func TestInitReverse(t *testing.T) {
 	}
 }
 
+// Test -init with -masterkey
+func TestInitMasterkey(t *testing.T) {
+	var testMk = make([]byte, 32)
+	dir := test_helpers.InitFS(t, fmt.Sprintf("-masterkey=%s", hex.EncodeToString(testMk)))
+	m, _, err := configfile.LoadAndDecrypt(dir+"/"+configfile.ConfDefaultName, testPw)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(testMk, m) {
+		t.Error("masterkey does not match")
+	}
+}
+
 // testPasswd changes the password from "test" to "test" using
 // the -extpass method, then from "test" to "newpasswd" using the
 // stdin method.