refactor: move all golang code for managing data directories to common plugin

Additionally, ensure the golang plugins handle setup/teardown of plugin and app-specific data directories during install, rename, and clone phases.

plugins/common/data.go

@@ -0,0 +1,82 @@
+package common
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/otiai10/copy"
+)
+
+// CreateAppDataDirectory creates a data directory for the given plugin/app combination with the correct permissions
+func CreateAppDataDirectory(pluginName, appName string) error {
+	directory := GetAppDataDirectory(pluginName, appName)
+	if err := os.MkdirAll(directory, 0755); err != nil {
+		return err
+	}
+
+	if err := SetPermissions(directory, 0755); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// CreateDataDirectory creates a data directory for the given plugin/app combination with the correct permissions
+func CreateDataDirectory(pluginName string) error {
+	directory := GetDataDirectory(pluginName)
+	if err := os.MkdirAll(directory, 0755); err != nil {
+		return err
+	}
+
+	if err := SetPermissions(directory, 0755); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// GetAppDataDirectory returns the path to the data directory for the given plugin/app combination
+func GetAppDataDirectory(pluginName string, appName string) string {
+	return filepath.Join(GetDataDirectory(pluginName), appName)
+}
+
+// GetDataDirectory returns the path to the data directory for the specified plugin
+func GetDataDirectory(pluginName string) string {
+	return filepath.Join(MustGetEnv("DOKKU_LIB_ROOT"), "data", pluginName)
+}
+
+// RemoveAppDataDirectory removes the path to the data directory for the given plugin/app combination
+func RemoveAppDataDirectory(pluginName, appName string) error {
+	return os.RemoveAll(GetAppDataDirectory(pluginName, appName))
+}
+
+func CloneAppData(pluginName string, oldAppName string, newAppName string) error {
+	oldDataDir := GetAppDataDirectory(pluginName, oldAppName)
+	newDataDir := GetAppDataDirectory(pluginName, newAppName)
+	if err := copy.Copy(oldDataDir, newDataDir); err != nil {
+		return fmt.Errorf("Unable to clone app data to new location: %v", err.Error())
+	}
+
+	return nil
+}
+
+// SetupAppData creates
+func SetupAppData(pluginName string) error {
+	if err := CreateDataDirectory(pluginName); err != nil {
+		return err
+	}
+
+	apps, err := UnfilteredDokkuApps()
+	if err != nil {
+		return nil
+	}
+
+	for _, appName := range apps {
+		if err := CreateAppDataDirectory(pluginName, appName); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}