Merge pull request #796 from socheatsok78/non-root-installer

Allow installer to run without requires `sudo`

README.md

@@ -83,7 +83,7 @@ _Resources page of Pangolin dashboard (dark mode) showing multiple resources ava
 
 ### Modular Design
 
-- Extend functionality with existing [Traefik](https://github.com/traefik/traefik) plugins, such as [CrowdSec](https://plugins.traefik.io/plugins/6335346ca4caa9ddeffda116/crowdsec-bouncer-traefik-plugin) and [Geoblock](github.com/PascalMinder/geoblock).
+- Extend functionality with existing [Traefik](https://github.com/traefik/traefik) plugins, such as [CrowdSec](https://plugins.traefik.io/plugins/6335346ca4caa9ddeffda116/crowdsec-bouncer-traefik-plugin) and [Geoblock](https://github.com/PascalMinder/geoblock).
     - **Automatically install and configure Crowdsec via Pangolin's installer script.**
 - Attach as many sites to the central server as you wish.
 

install/main.go

@@ -9,6 +9,7 @@ import (
 	"io/fs"
 	"os"
 	"os/exec"
+	"os/user"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -58,9 +59,18 @@ type Config struct {
 func main() {
 	reader := bufio.NewReader(os.Stdin)
 
-	// check if the user is root
-	if os.Geteuid() != 0 {
-		fmt.Println("This script must be run as 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.")
+			os.Exit(1)
+		}
+	}
+
+	// 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)
 	}
 
@@ -501,6 +511,34 @@ 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
@@ -641,4 +679,4 @@ func generateRandomSecretKey() string {
 		b[i] = charset[seededRand.Intn(len(charset))]
 	}
 	return string(b)
-}
+}