feat: implement app cache deletion

Introduce a `cache clean <app-id>` command to clean app cache.
This implementation also tries to stop the related app if running. In
case we do not care about that we can simply rm -rf `.cache/*`.

Closes #52

Author: alessio-perugini

cmd/arduino-app-cli/cache/cache.go

@@ -0,0 +1,17 @@
+package cache
+
+import (
+	"github.com/arduino/arduino-app-cli/internal/orchestrator/config"
+	"github.com/spf13/cobra"
+)
+
+func NewCacheCmd(cfg config.Configuration) *cobra.Command {
+	appCmd := &cobra.Command{
+		Use:   "cache",
+		Short: "Manage Arduino App cache",
+	}
+
+	appCmd.AddCommand(newCacheCleanCmd(cfg))
+
+	return appCmd
+}

cmd/arduino-app-cli/cache/clean.go

@@ -0,0 +1,58 @@
+package cache
+
+import (
+	"context"
+	"fmt"
+
+	cmdApp "github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/app"
+	"github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/completion"
+	"github.com/arduino/arduino-app-cli/cmd/feedback"
+	"github.com/arduino/arduino-app-cli/internal/orchestrator"
+	"github.com/arduino/arduino-app-cli/internal/orchestrator/app"
+	"github.com/arduino/arduino-app-cli/internal/orchestrator/config"
+	"github.com/spf13/cobra"
+)
+
+func newCacheCleanCmd(cfg config.Configuration) *cobra.Command {
+	appCmd := &cobra.Command{
+		Use:   "clean",
+		Short: "Delete app cache",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) == 0 {
+				return cmd.Help()
+			}
+			app, err := cmdApp.Load(args[0])
+			if err != nil {
+				return err
+			}
+			return cacheCleanHandler(cmd.Context(), app)
+		},
+		ValidArgsFunction: completion.ApplicationNames(cfg),
+	}
+
+	return appCmd
+}
+
+func cacheCleanHandler(ctx context.Context, app app.ArduinoApp) error {
+	if err := orchestrator.CleanAppCache(ctx, app); err != nil {
+		feedback.Fatal(err.Error(), feedback.ErrGeneric)
+	}
+	feedback.PrintResult(cacheCleanResult{
+		AppName: app.Name,
+		Path:    app.ProvisioningStateDir().String(),
+	})
+	return nil
+}
+
+type cacheCleanResult struct {
+	AppName string `json:"appName"`
+	Path    string `json:"path"`
+}
+
+func (r cacheCleanResult) String() string {
+	return fmt.Sprintf("✓ Cache of %q App cleaned", r.AppName)
+}
+
+func (r cacheCleanResult) Data() interface{} {
+	return r
+}

cmd/arduino-app-cli/main.go

@@ -26,6 +26,7 @@ import (
 
 	"github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/app"
 	"github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/brick"
+	"github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/cache"
 	"github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/completion"
 	"github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/config"
 	"github.com/arduino/arduino-app-cli/cmd/arduino-app-cli/daemon"
@@ -78,6 +79,7 @@ func run(configuration cfg.Configuration) error {
 		config.NewConfigCmd(configuration),
 		system.NewSystemCmd(configuration),
 		version.NewVersionCmd(Version),
+		cache.NewCacheCmd(configuration),
 	)
 
 	ctx := context.Background()

internal/orchestrator/cache.go

@@ -0,0 +1,17 @@
+package orchestrator
+
+import (
+	"context"
+
+	"github.com/arduino/arduino-app-cli/internal/orchestrator/app"
+)
+
+// CleanAppCache removes the `.cache` folder. If it detects that the app is running
+// it tries to stop it first.
+func CleanAppCache(ctx context.Context, app app.ArduinoApp) error {
+	if app.AppComposeFilePath().Exist() {
+		// We try to remove docker related resources at best effort
+		_ = StopAndDestroyApp(ctx, app)
+	}
+	return app.ProvisioningStateDir().RemoveAll()
+}