Revert "Say that a deploy keeps only an app's volumes when the app has none"

The owner asked for this commit to be reverted in full
(#254 (comment)). It
removes the no-volume-mounts sentence from the app page and the deploy
log, the constant and tests behind it, the README sentence, and its
TODO.md entry. Later TODO.md entries stay. #248
stays closed as rejected.

Model: opus-5-5

internal/handlers/app.go

@@ -21,7 +21,6 @@ import (
 	"sneak.berlin/go/upaas/internal/database"
 	"sneak.berlin/go/upaas/internal/models"
 	"sneak.berlin/go/upaas/internal/service/app"
-	"sneak.berlin/go/upaas/internal/service/deploy"
 	"sneak.berlin/go/upaas/templates"
 )
 
@@ -195,7 +194,6 @@ func (h *Handlers) HandleAppDetail() http.HandlerFunc {
 			"EnvVars":          envVars,
 			"Labels":           labels,
 			"Volumes":          volumes,
-			"NoVolumesWarning": deploy.NoVolumesWarning,
 			"Ports":            ports,
 			"Deployments":      deployments,
 			"LatestDeployment": latestDeployment,

internal/handlers/app_no_volumes_test.go

@@ -1,45 +0,0 @@
-package handlers_test
-
-import (
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"sneak.berlin/go/upaas/internal/models"
-	"sneak.berlin/go/upaas/internal/service/deploy"
-)
-
-// TestAppPageSaysFilesAreLostOnlyWhenAppHasNoVolumes checks that the app page
-// shows deploy.NoVolumesWarning until the app gets a volume mount.
-func TestAppPageSaysFilesAreLostOnlyWhenAppHasNoVolumes(t *testing.T) {
-	t.Parallel()
-
-	testCtx := setupTestHandlers(t)
-	createdApp := createTestApp(t, testCtx, "no-volumes-app")
-
-	renderAppPage := func() string {
-		request := httptest.NewRequestWithContext(
-			t.Context(), http.MethodGet, "/apps/"+createdApp.ID, nil,
-		)
-		request = addChiURLParams(request, map[string]string{"id": createdApp.ID})
-		recorder := httptest.NewRecorder()
-
-		testCtx.handlers.HandleAppDetail().ServeHTTP(recorder, request)
-		require.Equal(t, http.StatusOK, recorder.Code)
-
-		return recorder.Body.String()
-	}
-
-	assert.Contains(t, renderAppPage(), deploy.NoVolumesWarning)
-
-	volume := models.NewVolume(testCtx.database)
-	volume.AppID = createdApp.ID
-	volume.HostPath = "/srv/no-volumes-app"
-	volume.ContainerPath = "/data"
-	require.NoError(t, volume.Save(t.Context()))
-
-	assert.NotContains(t, renderAppPage(), deploy.NoVolumesWarning)
-}

internal/service/deploy/deploy.go

@@ -56,12 +56,6 @@ var (
 	ErrNoPreviousImage = errors.New("no previous image available for rollback")
 )
 
-// NoVolumesWarning is shown on the page of an app with no volume mounts and
-// written into each of its deploy logs.
-const NoVolumesWarning = "This app has no volume mounts, so the files it writes " +
-	"are lost whenever a deploy or rollback replaces its container; " +
-	"a restart of the container keeps them."
-
 // logFlushInterval is how often to flush buffered logs to the database.
 const logFlushInterval = time.Second
 
@@ -375,11 +369,6 @@ func (svc *Service) Deploy(
 
 	svc.logWebhookPayload(bgCtx, deployment, webhookEvent)
 
-	volumes, err := app.GetVolumes(bgCtx)
-	if err == nil && len(volumes) == 0 {
-		_ = deployment.AppendLog(bgCtx, NoVolumesWarning)
-	}
-
 	err = svc.updateAppStatusBuilding(bgCtx, app)
 	if err != nil {
 		return err

internal/service/deploy/deploy_volumes_test.go

@@ -1,79 +0,0 @@
-package deploy_test
-
-import (
-	"context"
-	"log/slog"
-	"os"
-	"strings"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"sneak.berlin/go/upaas/internal/config"
-	"sneak.berlin/go/upaas/internal/database"
-	"sneak.berlin/go/upaas/internal/docker"
-	"sneak.berlin/go/upaas/internal/logger"
-	"sneak.berlin/go/upaas/internal/models"
-	"sneak.berlin/go/upaas/internal/service/deploy"
-	"sneak.berlin/go/upaas/internal/service/notify"
-)
-
-// deployLog deploys a new app, with one volume mount when withVolume is set,
-// and returns the deploy's log. Docker is not connected, so the deploy fails
-// at the git clone, after the start of its log is written.
-func deployLog(t *testing.T, withVolume bool) string {
-	t.Helper()
-
-	log := logger.NewForTest(slog.New(slog.NewTextHandler(os.Stderr, nil)))
-	dataDir := t.TempDir()
-	cfg := &config.Config{DataDir: dataDir, HostDataDir: dataDir}
-	db := database.NewTestDatabase(t)
-
-	dockerClient, err := docker.New(nil, docker.Params{Logger: log, Config: cfg})
-	require.NoError(t, err)
-
-	notifySvc, err := notify.New(nil, notify.ServiceParams{Logger: log})
-	require.NoError(t, err)
-
-	svc, err := deploy.New(nil, deploy.ServiceParams{
-		Logger: log, Config: cfg, Database: db,
-		Docker: dockerClient, Notify: notifySvc,
-	})
-	require.NoError(t, err)
-
-	ctx := context.Background()
-
-	app := models.NewApp(db)
-	app.ID = "volumesapp-id"
-	app.Name = "volumesapp"
-	app.Branch = "main"
-	require.NoError(t, app.Save(ctx))
-
-	if withVolume {
-		volume := models.NewVolume(db)
-		volume.AppID = app.ID
-		volume.HostPath = "/srv/volumesapp"
-		volume.ContainerPath = "/data"
-		require.NoError(t, volume.Save(ctx))
-	}
-
-	err = svc.Deploy(ctx, app, nil, false)
-	require.ErrorIs(t, err, docker.ErrNotConnected)
-
-	deployments, err := app.GetDeployments(ctx, 1)
-	require.NoError(t, err)
-	require.Len(t, deployments, 1)
-
-	return deployments[0].Logs.String
-}
-
-func TestDeployLogSaysFilesAreLostOnlyWhenAppHasNoVolumes(t *testing.T) {
-	t.Parallel()
-
-	logWithoutVolumes := deployLog(t, false)
-	assert.Equal(t, 1, strings.Count(logWithoutVolumes, deploy.NoVolumesWarning),
-		logWithoutVolumes)
-
-	assert.NotContains(t, deployLog(t, true), deploy.NoVolumesWarning)
-}