feat: add init system detection and container management improvements

- Introduced `test-init-fix.sh` for testing init system detection and container setup.
- Added `test-simple.yml` for a simple container configuration.
- Refactored container manager creation to support backend selection in `down.go`, `logs.go`, `pause.go`, `ps.go`, `unpause.go`, and `up.go`.
- Implemented `manager_factory.go` to handle backend-specific container manager instantiation.
- Added `pct_manager.go` as a placeholder for Proxmox `pct` commands, with basic container management functions.
- Enhanced `LXCManager` with improved logging and configuration generation for better container initialization.

Author: larkinwc

cmd/lxc-compose/down.go

@@ -46,7 +46,7 @@ func downCmdRunE(_ *cobra.Command, args []string, configFile string) error {
 	compose := cfg
 
 	// Create container manager
-	manager, err := container.NewLXCManager("/var/lib/lxc")
+	manager, err := container.NewManager(backend, "/var/lib/lxc")
 	if err != nil {
 		return fmt.Errorf("failed to create container manager: %w", err)
 	}

cmd/lxc-compose/logs.go

@@ -25,7 +25,7 @@ func init() {
 			name := args[0]
 
 			// Create container manager
-			manager, err := container.NewLXCManager("/var/lib/lxc")
+			manager, err := container.NewManager(backend, "/var/lib/lxc")
 			if err != nil {
 				return fmt.Errorf("failed to create container manager: %w", err)
 			}

cmd/lxc-compose/main.go

@@ -14,6 +14,7 @@ var (
 	cfgFile     string
 	debugMode   bool
 	development bool
+	backend     string
 )
 
 func init() {
@@ -22,6 +23,7 @@ func init() {
 	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.lxc-compose.yaml)")
 	rootCmd.PersistentFlags().BoolVar(&debugMode, "debug", false, "enable debug logging")
 	rootCmd.PersistentFlags().BoolVar(&development, "dev", false, "enable development mode")
+	rootCmd.PersistentFlags().StringVar(&backend, "backend", "auto", "container backend to use (pct|lxc|auto)")
 }
 
 func initConfig() {

cmd/lxc-compose/pause.go

@@ -15,7 +15,7 @@ func init() {
 		Args:  cobra.MinimumNArgs(1),
 		RunE: func(_ *cobra.Command, args []string) error {
 			// Create container manager
-			manager, err := container.NewLXCManager("/var/lib/lxc")
+			manager, err := container.NewManager(backend, "/var/lib/lxc")
 			if err != nil {
 				return fmt.Errorf("failed to create container manager: %w", err)
 			}

cmd/lxc-compose/ps.go

@@ -36,7 +36,7 @@ func init() {
 			}
 
 			// Create container manager
-			manager, err := container.NewLXCManager("/var/lib/lxc")
+			manager, err := container.NewManager(backend, "/var/lib/lxc")
 			if err != nil {
 				return fmt.Errorf("failed to create container manager: %w", err)
 			}

cmd/lxc-compose/unpause.go

@@ -15,7 +15,7 @@ func init() {
 		Args:  cobra.MinimumNArgs(1),
 		RunE: func(_ *cobra.Command, args []string) error {
 			// Create container manager
-			manager, err := container.NewLXCManager("/var/lib/lxc")
+			manager, err := container.NewManager(backend, "/var/lib/lxc")
 			if err != nil {
 				return fmt.Errorf("failed to create container manager: %w", err)
 			}

cmd/lxc-compose/up.go

@@ -42,7 +42,7 @@ func upCmdRunE(_ *cobra.Command, args []string) error {
 	}
 
 	// Create container manager
-	manager, err := container.NewLXCManager("/var/lib/lxc")
+	manager, err := container.NewManager(backend, "/var/lib/lxc")
 	if err != nil {
 		return fmt.Errorf("failed to create container manager: %w", err)
 	}

integration-test/docker-lxc/test-data/minimal-test.yml

@@ -0,0 +1,16 @@
+version: "3"
+services:
+  minimal:
+    image: "ubuntu:20.04"
+    # Remove all network configuration to avoid networking issues
+    storage:
+      root: "1G" 
+      backend: "dir"
+    security:
+      privileged: false
+    cpu:
+      cores: 1
+    memory:
+      limit: "512M"
+    environment:
+      TEST_VAR: "minimal_test"