Merge pull request #6436 from ethereum-optimism/op-chain-ops/deploy-config-copy

op-chain-ops: deploy config copy

op-chain-ops/genesis/config.go

@@ -169,6 +169,22 @@ type DeployConfig struct {
 	FundDevAccounts bool `json:"fundDevAccounts"`
 }
 
+// Copy will deeply copy the DeployConfig. This does a JSON roundtrip to copy
+// which makes it easier to maintain, we do not need efficiency in this case.
+func (d *DeployConfig) Copy() *DeployConfig {
+	raw, err := json.Marshal(d)
+	if err != nil {
+		panic(err)
+	}
+
+	cpy := DeployConfig{}
+	if err = json.Unmarshal(raw, &cpy); err != nil {
+		panic(err)
+	}
+
+	return &cpy
+}
+
 // Check will ensure that the config is sane and return an error when it is not
 func (d *DeployConfig) Check() error {
 	if d.L1StartingBlockTag == nil {

op-chain-ops/genesis/config_test.go

@@ -48,3 +48,19 @@ func TestRegolithTimeAsOffset(t *testing.T) {
 	config := &DeployConfig{L2GenesisRegolithTimeOffset: &regolithOffset}
 	require.Equal(t, uint64(1500+5000), *config.RegolithTime(5000))
 }
+
+// TestCopy will copy a DeployConfig and ensure that the copy is equal to the original.
+func TestCopy(t *testing.T) {
+	b, err := os.ReadFile("testdata/test-deploy-config-full.json")
+	require.NoError(t, err)
+
+	decoded := new(DeployConfig)
+	require.NoError(t, json.NewDecoder(bytes.NewReader(b)).Decode(decoded))
+
+	cpy := decoded.Copy()
+	require.EqualValues(t, decoded, cpy)
+
+	offset := hexutil.Uint64(100)
+	cpy.L2GenesisRegolithTimeOffset = &offset
+	require.NotEqual(t, decoded, cpy)
+}