feat: check for minimum anvil version

cmd/main.go

@@ -1,9 +1,14 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"os"
+	"os/exec"
+	"regexp"
+	"strconv"
+	"strings"
 
 	"github.com/ethereum-optimism/supersim"
 
@@ -23,6 +28,10 @@ var (
 	EnvVarPrefix = "SUPERSIM"
 )
 
+const (
+	minAnvilVersion = "0.2.0"
+)
+
 func main() {
 	oplog.SetupDefaults()
 
@@ -45,6 +54,11 @@ func main() {
 
 func SupersimMain(ctx *cli.Context, closeApp context.CancelCauseFunc) (cliapp.Lifecycle, error) {
 	log := oplog.NewLogger(oplog.AppOut(ctx), oplog.ReadCLIConfig(ctx))
+	ok, minAnvilErr := IsMinAnvilInstalled(log)
+
+	if !ok || minAnvilErr != nil {
+		return nil, fmt.Errorf("Anvil version %s or higher is required.", minAnvilVersion)
+	}
 
 	_, err := supersim.ReadCLIConfig(ctx)
 	if err != nil {
@@ -59,3 +73,53 @@ func SupersimMain(ctx *cli.Context, closeApp context.CancelCauseFunc) (cliapp.Li
 
 	return s, nil
 }
+
+func IsMinAnvilInstalled(log log.Logger) (bool, error) {
+	cmd := exec.Command("anvil", "--version")
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	err := cmd.Run()
+	if err != nil {
+		return false, err
+	}
+
+	output := out.String()
+
+	versionRegex := regexp.MustCompile(`\d+\.\d+\.\d+`)
+	version := versionRegex.FindString(output)
+
+	if version == "" {
+		return false, fmt.Errorf("Failed to parse anvil version from output")
+	}
+
+	log.Info(fmt.Sprintf("Anvil version installed: %s", version))
+
+	if isVersionGreaterOrEqual(version, minAnvilVersion) {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+// Compares two semantic versions.
+func isVersionGreaterOrEqual(version, minVersion string) bool {
+	v1 := strings.Split(version, ".")
+	v2 := strings.Split(minVersion, ".")
+
+	for i := 0; i < 3; i++ {
+		num1, err1 := strconv.Atoi(v1[i])
+		num2, err2 := strconv.Atoi(v2[i])
+		if err1 != nil || err2 != nil {
+			return false
+		}
+
+		if num1 > num2 {
+			return true
+		} else if num1 < num2 {
+			return false
+		}
+	}
+
+	// versions are equal
+	return true
+}