Support for sharing files with the host system (#103)

* Support for sharing files with the host system

* Integration tests

* Added back TestVMGarbageCollection comment

internal/controller/api_cluster_settings.go

@@ -0,0 +1,53 @@
+package controller
+
+import (
+	storepkg "github.com/cirruslabs/orchard/internal/controller/store"
+	"github.com/cirruslabs/orchard/internal/responder"
+	v1 "github.com/cirruslabs/orchard/pkg/resource/v1"
+	"github.com/gin-gonic/gin"
+	"net/http"
+)
+
+func (controller *Controller) getClusterSettings(ctx *gin.Context) responder.Responder {
+	if responder := controller.authorize(ctx, v1.ServiceAccountRoleAdminRead); responder != nil {
+		return responder
+	}
+
+	return controller.storeView(func(txn storepkg.Transaction) responder.Responder {
+		clusterSettings, err := txn.GetClusterSettings()
+		if err != nil {
+			controller.logger.Errorf("failed to retrieve cluster settings: %v", err)
+			return responder.Code(http.StatusInternalServerError)
+		}
+
+		return responder.JSON(http.StatusOK, clusterSettings)
+	})
+}
+
+func (controller *Controller) updateClusterSettings(ctx *gin.Context) responder.Responder {
+	if responder := controller.authorize(ctx, v1.ServiceAccountRoleAdminWrite); responder != nil {
+		return responder
+	}
+
+	var clusterSettings v1.ClusterSettings
+
+	if err := ctx.ShouldBindJSON(&clusterSettings); err != nil {
+		return responder.JSON(http.StatusBadRequest, NewErrorResponse("invalid JSON was provided"))
+	}
+
+	// Validate
+	for _, allowedHostDir := range clusterSettings.HostDirPolicies {
+		if allowedHostDir.PathPrefix == "" {
+			return responder.JSON(http.StatusBadRequest,
+				NewErrorResponse("pathPrefix field cannot be empty"))
+		}
+	}
+
+	return controller.storeUpdate(func(txn storepkg.Transaction) responder.Responder {
+		if err := txn.SetClusterSettings(clusterSettings); err != nil {
+			return responder.Code(http.StatusInternalServerError)
+		}
+
+		return responder.JSON(http.StatusOK, &clusterSettings)
+	})
+}