new: new -caplets-path argument to specify an alternative caplets base path (closes #850)

caplets/env.go

@@ -15,7 +15,7 @@ const (
 	InstallArchive = "https://github.com/bettercap/caplets/archive/master.zip"
 )
 
-func getInstallBase() string {
+func getDefaultInstallBase() string {
 	if runtime.GOOS == "windows" {
 		return filepath.Join(os.Getenv("ALLUSERSPROFILE"), "bettercap")
 	}
@@ -28,10 +28,18 @@ func getUserHomeDir() string {
 }
 
 var (
-	InstallBase        = getInstallBase()
+	InstallBase        = ""
+	InstallPathArchive = ""
+	InstallPath        = ""
+	ArchivePath        = ""
+	LoadPaths          = []string(nil)
+)
+
+func Setup(base string) error {
+	InstallBase = base
 	InstallPathArchive = filepath.Join(InstallBase, "caplets-master")
-	InstallPath        = filepath.Join(InstallBase, "caplets")
-	ArchivePath        = filepath.Join(os.TempDir(), "caplets.zip")
+	InstallPath = filepath.Join(InstallBase, "caplets")
+	ArchivePath = filepath.Join(os.TempDir(), "caplets.zip")
 
 	LoadPaths = []string{
 		"./",
@@ -39,9 +47,7 @@ var (
 		InstallPath,
 		filepath.Join(getUserHomeDir(), "caplets"),
 	}
-)
 
-func init() {
 	for _, path := range str.SplitBy(str.Trim(os.Getenv(EnvVarName)), string(os.PathListSeparator)) {
 		if path = str.Trim(path); len(path) > 0 {
 			LoadPaths = append(LoadPaths, path)
@@ -51,4 +57,11 @@ func init() {
 	for i, path := range LoadPaths {
 		LoadPaths[i], _ = filepath.Abs(path)
 	}
+
+	return nil
+}
+
+func init() {
+	// init with defaults
+	Setup(getDefaultInstallBase())
 }

core/options.go

@@ -16,6 +16,7 @@ type Options struct {
 	Commands      *string
 	CpuProfile    *string
 	MemProfile    *string
+	CapletsPath   *string
 }
 
 func ParseOptions() (Options, error) {
@@ -33,6 +34,7 @@ func ParseOptions() (Options, error) {
 		Commands:      flag.String("eval", "", "Run one or more commands separated by ; in the interactive session, used to set variables via command line."),
 		CpuProfile:    flag.String("cpu-profile", "", "Write cpu profile `file`."),
 		MemProfile:    flag.String("mem-profile", "", "Write memory profile to `file`."),
+		CapletsPath:   flag.String("caplets-path", "", "Specify an alternative base path for caplets."),
 	}
 
 	flag.Parse()

session/session.go

@@ -224,6 +224,12 @@ func (s *Session) Start() error {
 		return s.Modules[i].Name() < s.Modules[j].Name()
 	})
 
+	if *s.Options.CapletsPath != "" {
+		if err = caplets.Setup(*s.Options.CapletsPath); err != nil {
+			return err
+		}
+	}
+
 	if s.Interface, err = network.FindInterface(*s.Options.InterfaceName); err != nil {
 		return err
 	}