fix(cmd): set the correct default HD path for key recovery (#913)

* implement set flag

* replace flag

* remove panic

* goimports

cmd/zetacored/flags.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var KeyAddCommand = []string{"keys", "add"}
+
+const (
+	HDPathFlag     = "hd-path"
+	HDPathEthereum = "m/44'/60'/0'/0/0"
+)
+
+// SetEthereumHDPath sets the default HD path to Ethereum's
+func SetEthereumHDPath(cmd *cobra.Command) error {
+	return ReplaceFlag(cmd, KeyAddCommand, HDPathFlag, HDPathEthereum)
+}
+
+// ReplaceFlag replaces the default value of a flag of a sub-command
+func ReplaceFlag(cmd *cobra.Command, subCommand []string, flagName, newDefaultValue string) error {
+	// Find the sub-command
+	c, _, err := cmd.Find(subCommand)
+	if err != nil {
+		return fmt.Errorf("failed to find %v sub-command: %v", subCommand, err)
+	}
+
+	// Get the flag from the sub-command
+	f := c.Flags().Lookup(flagName)
+	if f == nil {
+		return fmt.Errorf("%s flag not found in %v sub-command", flagName, subCommand)
+	}
+
+	// Set the default value for the flag
+	f.DefValue = newDefaultValue
+	if err := f.Value.Set(newDefaultValue); err != nil {
+		return fmt.Errorf("failed to set the value of %s flag: %v", flagName, err)
+	}
+
+	return nil
+}

cmd/zetacored/flags_test.go

@@ -0,0 +1,92 @@
+package main_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/require"
+	zetacore "github.com/zeta-chain/zetacore/cmd/zetacored"
+)
+
+// alwaysErrorValue allows to test f.Value.Set failure
+type alwaysErrorValue struct{}
+
+func (a *alwaysErrorValue) Set(string) error { return errors.New("error") }
+func (a *alwaysErrorValue) String() string   { return "" }
+func (a *alwaysErrorValue) Type() string     { return "string" }
+
+func TestReplaceFlag(t *testing.T) {
+	// Setting up a mock command structure
+	rootCmd := &cobra.Command{Use: "app"}
+
+	fooCmd := &cobra.Command{Use: "foo"}
+	barCmd := &cobra.Command{Use: "bar"}
+
+	barCmd.Flags().String("baz", "old", "Bar")
+	barCmd.Flags().Var(&alwaysErrorValue{}, "error", "Always fails to set")
+
+	fooCmd.AddCommand(barCmd)
+	rootCmd.AddCommand(fooCmd)
+
+	tests := []struct {
+		name            string
+		cmd             *cobra.Command
+		subCommand      []string
+		flagName        string
+		newDefaultValue string
+		wantErr         bool
+		expectedValue   string
+	}{
+		{
+			name:            "Replace valid flag",
+			cmd:             rootCmd,
+			subCommand:      []string{"foo", "bar"},
+			flagName:        "baz",
+			newDefaultValue: "new",
+			wantErr:         false,
+			expectedValue:   "new",
+		},
+		{
+			name:            "Sub-command not found",
+			cmd:             rootCmd,
+			subCommand:      []string{"key", "nonexistent"},
+			flagName:        "baz",
+			newDefaultValue: "new",
+			wantErr:         true,
+		},
+		{
+			name:            "Flag not found",
+			cmd:             rootCmd,
+			subCommand:      []string{"foo", "bar"},
+			flagName:        "nonexistent",
+			newDefaultValue: "new",
+			wantErr:         true,
+		},
+		{
+			name:            "Flag value cannot be set",
+			cmd:             rootCmd,
+			subCommand:      []string{"foo", "bar"},
+			flagName:        "error",
+			newDefaultValue: "new",
+			wantErr:         true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := zetacore.ReplaceFlag(tt.cmd, tt.subCommand, tt.flagName, tt.newDefaultValue)
+
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+
+				// Check if the value was replaced correctly
+				c, _, _ := tt.cmd.Find(tt.subCommand)
+				f := c.Flags().Lookup(tt.flagName)
+				require.Equal(t, tt.expectedValue, f.DefValue)
+			}
+		})
+	}
+}

cmd/zetacored/root.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -142,6 +143,11 @@ func initRootCmd(rootCmd *cobra.Command, encodingConfig appparams.EncodingConfig
 		ethermintclient.KeyCommands(app.DefaultNodeHome),
 	)
 
+	// replace the default hd-path for the key add command
+	if err := SetEthereumHDPath(rootCmd); err != nil {
+		fmt.Printf("warning: unable to set default HD path: %v\n", err)
+	}
+
 	rootCmd.AddCommand(server.RosettaCommand(encodingConfig.InterfaceRegistry, encodingConfig.Codec))
 
 }