Ensure installer check if current user is in docker group

install/main.go

@@ -9,6 +9,7 @@ import (
 	"io/fs"
 	"os"
 	"os/exec"
+	"os/user"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -57,7 +58,7 @@ type Config struct {
 func main() {
 	reader := bufio.NewReader(os.Stdin)
 
-	// check if the user is root
+	// check if docker is not installed and the user is root
 	if !isDockerInstalled() {
 		if os.Geteuid() != 0 {
 			fmt.Println("Docker is not installed. Please install Docker manually or run this installer as root.")
@@ -65,6 +66,13 @@ func main() {
 		}
 	}
 
+	// check if the user is in the docker group (linux only)
+	if !isUserInDockerGroup() {
+		fmt.Println("You are not in the docker group.")
+		fmt.Println("The installer will not be able to run docker commands without running it as root.")
+		os.Exit(1)
+	}
+
 	var config Config
 	
 	// check if there is already a config file
@@ -481,6 +489,34 @@ func isDockerInstalled() bool {
 	return true
 }
 
+func isUserInDockerGroup() bool {
+	if runtime.GOOS == "darwin" {
+		// Docker group is not applicable on macOS
+		// So we assume that the user can run Docker commands
+		return true
+	}
+
+	if os.Geteuid() == 0 {
+		return true // Root user can run Docker commands anyway
+	}
+
+	// Check if the current user is in the docker group
+	if dockerGroup, err := user.LookupGroup("docker"); err == nil {
+		if currentUser, err := user.Current(); err == nil {
+			if currentUserGroupIds, err := currentUser.GroupIds(); err == nil {
+				for _, groupId := range currentUserGroupIds {
+					if groupId == dockerGroup.Gid {
+						return true
+					}
+				}
+			}
+		}
+	}
+
+	// Eventually, if any of the checks fail, we assume the user cannot run Docker commands
+	return false
+}
+
 // executeDockerComposeCommandWithArgs executes the appropriate docker command with arguments supplied
 func executeDockerComposeCommandWithArgs(args ...string) error {
 	var cmd *exec.Cmd