Remove new-from-rev from the linter (#1783)

* Fix all revive warnings in the code base

All of these are of the form

```
var Identifier Type = Expr
```

where the `Type` is known from the output of `Expr` and can be omitted
as a result.

* Handle unchecked errors

* Remove new-from-rev

Since the project passes all linter checks now, including older
revisions, we can remove new-from-rev. While here, reorder the linter
config file, and move the enabled linters up and settings down.

* Fix failing test cases

Studio & Performer export tests use local time rather than UTC. This
fixes the test cases so integration test
passes.

.golangci.yml

@@ -3,10 +3,23 @@ run:
   timeout: 3m
   modules-download-mode: vendor
 
-issues:
-  # Rev at which the linter was introduced. Older bugs are still
-  # present, but should not be considered validation errors for now
-  new-from-rev: b14d5c56504dfcea2f5a7b86706b0ecdafd0b68c
+linters:
+  disable-all: true
+  enable:
+    # Default set of linters from golangci-lint
+    - deadcode
+    - errcheck
+    - gosimple
+    - govet
+    - ineffassign
+    - staticcheck
+    - structcheck
+    - typecheck
+    - unused
+    - varcheck
+    # Linters added by the stash project
+    - gofmt
+    - revive
 
 linters-settings:
   gofmt:
@@ -52,21 +65,3 @@ linters-settings:
       - name: unreachable-code
       - name: redefines-builtin-id
 
-linters:
-  disable-all: true
-  enable:
-    # Default set of linters from golangci-lint
-    - deadcode
-    - errcheck
-    - gosimple
-    - govet
-    - ineffassign
-    - staticcheck
-    - structcheck
-    - typecheck
-    - unused
-    - varcheck
-    # Linters added by the stash project
-    - gofmt
-    - revive
-

pkg/api/routes_image.go

@@ -59,7 +59,9 @@ func (rs imageRoutes) Thumbnail(w http.ResponseWriter, r *http.Request) {
 				logger.Errorf("error writing thumbnail for image %s: %s", img.Path, err)
 			}
 		}
-		w.Write(data)
+		if n, err := w.Write(data); err != nil {
+			logger.Errorf("error writing thumbnail response. Wrote %v bytes: %v", n, err)
+		}
 	}
 }
 

pkg/gallery/export_test.go

@@ -39,8 +39,10 @@ const (
 	studioName = "studioName"
 )
 
-var createTime time.Time = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
-var updateTime time.Time = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+var (
+	createTime = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
+	updateTime = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+)
 
 func createFullGallery(id int) models.Gallery {
 	return models.Gallery{

pkg/gallery/import_test.go

@@ -39,8 +39,10 @@ const (
 	errChecksum     = "errChecksum"
 )
 
-var createdAt time.Time = time.Date(2001, time.January, 2, 1, 2, 3, 4, time.Local)
-var updatedAt time.Time = time.Date(2002, time.January, 2, 1, 2, 3, 4, time.Local)
+var (
+	createdAt = time.Date(2001, time.January, 2, 1, 2, 3, 4, time.Local)
+	updatedAt = time.Date(2002, time.January, 2, 1, 2, 3, 4, time.Local)
+)
 
 func TestImporterName(t *testing.T) {
 	i := Importer{

pkg/image/export_test.go

@@ -53,8 +53,10 @@ const (
 	//galleryChecksum = "galleryChecksum"
 )
 
-var createTime time.Time = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
-var updateTime time.Time = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+var (
+	createTime = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
+	updateTime = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+)
 
 func createFullImage(id int) models.Image {
 	return models.Image{

pkg/image/thumbnail.go

@@ -46,7 +46,9 @@ func (e *ThumbnailEncoder) GetThumbnail(img *models.Image, maxSize int) ([]byte,
 	}
 
 	buf := new(bytes.Buffer)
-	buf.ReadFrom(reader)
+	if _, err := buf.ReadFrom(reader); err != nil {
+		return nil, err
+	}
 
 	_, format, err := DecodeSourceImage(img)
 	if err != nil {

pkg/movie/export_test.go

@@ -44,18 +44,24 @@ const url = "url"
 
 const studioName = "studio"
 
-const frontImage = "ZnJvbnRJbWFnZUJ5dGVz"
-const backImage = "YmFja0ltYWdlQnl0ZXM="
+const (
+	frontImage = "ZnJvbnRJbWFnZUJ5dGVz"
+	backImage  = "YmFja0ltYWdlQnl0ZXM="
+)
 
-var frontImageBytes = []byte("frontImageBytes")
-var backImageBytes = []byte("backImageBytes")
+var (
+	frontImageBytes = []byte("frontImageBytes")
+	backImageBytes  = []byte("backImageBytes")
+)
 
 var studio models.Studio = models.Studio{
 	Name: models.NullString(studioName),
 }
 
-var createTime time.Time = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
-var updateTime time.Time = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+var (
+	createTime = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
+	updateTime = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+)
 
 func createFullMovie(id int, studioID int) models.Movie {
 	return models.Movie{

pkg/performer/export_test.go

@@ -54,8 +54,11 @@ var deathDate = models.SQLiteDate{
 	String: "2021-02-02",
 	Valid:  true,
 }
-var createTime time.Time = time.Date(2001, 01, 01, 0, 0, 0, 0, time.Local)
-var updateTime time.Time = time.Date(2002, 01, 01, 0, 0, 0, 0, time.Local)
+
+var (
+	createTime = time.Date(2001, 01, 01, 0, 0, 0, 0, time.Local)
+	updateTime = time.Date(2002, 01, 01, 0, 0, 0, 0, time.Local)
+)
 
 func createFullPerformer(id int, name string) *models.Performer {
 	return &models.Performer{

pkg/scene/export_test.go

@@ -87,8 +87,10 @@ var imageBytes = []byte("imageBytes")
 
 const image = "aW1hZ2VCeXRlcw=="
 
-var createTime time.Time = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
-var updateTime time.Time = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+var (
+	createTime = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
+	updateTime = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+)
 
 func createFullScene(id int) models.Scene {
 	return models.Scene{

pkg/sqlite/filter.go

@@ -105,7 +105,7 @@ type filterBuilder struct {
 	err error
 }
 
-var errSubFilterAlreadySet error = errors.New(`sub-filter already set`)
+var errSubFilterAlreadySet = errors.New(`sub-filter already set`)
 
 // sub-filter operator values
 var (

pkg/studio/export_test.go

@@ -41,8 +41,10 @@ var imageBytes = []byte("imageBytes")
 
 const image = "aW1hZ2VCeXRlcw=="
 
-var createTime time.Time = time.Date(2001, 01, 01, 0, 0, 0, 0, time.Local)
-var updateTime time.Time = time.Date(2002, 01, 01, 0, 0, 0, 0, time.Local)
+var (
+	createTime = time.Date(2001, 01, 01, 0, 0, 0, 0, time.Local)
+	updateTime = time.Date(2002, 01, 01, 0, 0, 0, 0, time.Local)
+)
 
 func createFullStudio(id int, parentID int) models.Studio {
 	ret := models.Studio{

pkg/tag/export_test.go

@@ -23,8 +23,10 @@ const (
 
 const tagName = "testTag"
 
-var createTime time.Time = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
-var updateTime time.Time = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+var (
+	createTime = time.Date(2001, 01, 01, 0, 0, 0, 0, time.UTC)
+	updateTime = time.Date(2002, 01, 01, 0, 0, 0, 0, time.UTC)
+)
 
 func createTag(id int) models.Tag {
 	return models.Tag{