Add support for provisioning and rebuilding via interface

internal/wisski/ingredient/barrel/system/system.go

@@ -0,0 +1,37 @@
+package system
+
+import (
+	"context"
+	"io"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/models"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient/barrel"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient/bookkeeping"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient/php/extras"
+)
+
+// SystemManager applies a specific system configuration
+type SystemManager struct {
+	ingredient.Base
+	Dependencies struct {
+		Barrel      *barrel.Barrel
+		Bookkeeping *bookkeeping.Bookkeeping
+		Settings    *extras.Settings
+	}
+}
+
+// Apply applies a specific system version to this barrel.
+// If start is true, also starts the container.
+func (smanager *SystemManager) Apply(ctx context.Context, progress io.Writer, system models.System, start bool) (err error) {
+	// setup the new docker image
+	smanager.Instance.System = system
+
+	// save in bookkeeping
+	if err := smanager.Dependencies.Bookkeeping.Save(ctx); err != nil {
+		return err
+	}
+
+	// and rebuild
+	return smanager.Dependencies.Barrel.Build(ctx, progress, start)
+}