all: re-enable staticcheck rule ST1012

Makefile

@@ -130,12 +130,10 @@ vet: $(SOURCES) ## run Go vet
 # TODO(sszuecs) review disabling these checks, f.e.:
 # -ST1000 missing package doc in many packages
 # -ST1003 wrong naming convention Api vs API, Id vs ID
-# -ST1012 too many error variables are not having prefix "err"
 # -ST1020 too many wrong comments on exported functions to fix right away
 # -ST1021 too many wrong comments on exported functions to fix right away
-# -ST1022 too many wrong comments on exported functions to fix right away
 staticcheck: $(SOURCES) ## run staticcheck
-	staticcheck -checks "all,-ST1000,-ST1003,-ST1012,-ST1020,-ST1021" ./...
+	staticcheck -checks "all,-ST1000,-ST1003,-ST1020,-ST1021" ./...
 
 .PHONY: gosec
 # TODO(sszuecs) review disabling these checks, f.e.:

cmd/eskip/args.go

@@ -55,9 +55,9 @@ func (w *noopWriter) Write(b []byte) (int, error) {
 }
 
 var (
-	invalidNumberOfArgs = errors.New("invalid number of args")
-	missingOAuthToken   = errors.New("missing OAuth token")
-	invalidIndentStr    = errors.New("invalid indent. Must match regexp \\s")
+	errInvalidNumberOfArgs = errors.New("invalid number of args")
+	errMissingOAuthToken   = errors.New("missing OAuth token")
+	errInvalidIndentStr    = errors.New("invalid indent. Must match regexp \\s")
 )
 
 // parsing vars for flags:
@@ -175,7 +175,7 @@ func processInnkeeperArgs(innkeeperUrl, oauthToken string) (*medium, error) {
 	}
 
 	if oauthToken == "" {
-		return nil, missingOAuthToken
+		return nil, errMissingOAuthToken
 	}
 
 	if innkeeperUrl == "" {
@@ -197,7 +197,7 @@ func processInnkeeperArgs(innkeeperUrl, oauthToken string) (*medium, error) {
 func processFileArg() (*medium, error) {
 	nonFlagArgs := flags.Args()
 	if len(nonFlagArgs) > 1 {
-		return nil, invalidNumberOfArgs
+		return nil, errInvalidNumberOfArgs
 	}
 
 	if len(nonFlagArgs) == 0 {
@@ -212,7 +212,7 @@ func processFileArg() (*medium, error) {
 // if pretty print then check that indent matches pattern
 func processIndentStr() error {
 	if pretty && !(regexp.MustCompile(`^[\s]*$`).MatchString(indentStr)) {
-		return invalidIndentStr
+		return errInvalidIndentStr
 	}
 	return nil
 

cmd/eskip/args_test.go

@@ -118,7 +118,7 @@ func TestProcessArgs(t *testing.T) {
 		// innkeeper-url missing token
 		[]string{"-innkeeper-url", "https://innkeeper.example.org"},
 		true,
-		missingOAuthToken,
+		errMissingOAuthToken,
 		nil,
 	}, {
 
@@ -166,7 +166,7 @@ func TestProcessArgs(t *testing.T) {
 		// too many files
 		[]string{"file1", "file2"},
 		true,
-		invalidNumberOfArgs,
+		errInvalidNumberOfArgs,
 		nil,
 	}, {
 

cmd/eskip/eskip.go

@@ -52,8 +52,8 @@ var commands = map[command]commandFunc{
 	ver:    versionCmd}
 
 var (
-	missingCommand = errors.New("missing command")
-	invalidCommand = errors.New("invalid command")
+	errMissingCommand = errors.New("missing command")
+	errInvalidCommand = errors.New("invalid command")
 )
 
 var stdout io.Writer = os.Stdout
@@ -90,18 +90,18 @@ func exit(err error)     { exitErrHint(err, false) }
 // second argument must be the ('sub') command.
 func getCommand(args []string) (command, error) {
 	if len(args) < 2 {
-		return "", missingCommand
+		return "", errMissingCommand
 	}
 
 	cmd := command(args[1])
 	if cmd[0] == '-' {
-		return "", missingCommand
+		return "", errMissingCommand
 	}
 
 	if _, ok := commands[cmd]; ok {
 		return cmd, nil
 	} else {
-		return "", invalidCommand
+		return "", errInvalidCommand
 	}
 }
 

cmd/eskip/eskip_test.go

@@ -13,14 +13,14 @@ func TestGetCommandSuccess(t *testing.T) {
 
 func TestGetCommandFail(t *testing.T) {
 	_, err := getCommand([]string{"some", "hello"})
-	if err != invalidCommand {
+	if err != errInvalidCommand {
 		t.Error("hello is an invalid command")
 	}
 }
 
 func TestGetCommandEmpty(t *testing.T) {
 	_, err := getCommand([]string{"some"})
-	if err != missingCommand {
+	if err != errMissingCommand {
 		t.Error("empty should fail ")
 	}
 }

cmd/eskip/load.go

@@ -28,7 +28,7 @@ type loadResult struct {
 	parseErrors map[string]error
 }
 
-var invalidRouteExpression = errors.New("one or more invalid route expressions")
+var errInvalidRouteExpression = errors.New("one or more invalid route expressions")
 
 // store all loaded routes, even if invalid, and store the
 // parse errors if any.
@@ -67,7 +67,7 @@ func checkParseErrors(lr loadResult) error {
 		printStderr(id, perr)
 	}
 
-	return invalidRouteExpression
+	return errInvalidRouteExpression
 }
 
 // load, parse routes and print parse errors if any.
@@ -146,7 +146,7 @@ func printCmd(a cmdArgs) error {
 	}
 
 	if len(lr.parseErrors) > 0 {
-		return invalidRouteExpression
+		return errInvalidRouteExpression
 	}
 
 	return nil

cmd/eskip/load_test.go

@@ -16,7 +16,6 @@ package main
 
 import (
 	"bytes"
-	"errors"
 	"os"
 	"strings"
 	"testing"
@@ -26,8 +25,6 @@ import (
 
 const testStdinName = "testStdin"
 
-var ioError = errors.New("io error")
-
 func preserveStdin(f *os.File, action func()) {
 	f, os.Stdin = os.Stdin, f
 	defer func() { os.Stdin = f }()
@@ -61,11 +58,7 @@ func withFile(name string, content string, action func(f *os.File)) error {
 
 	withError(func() { err = os.Remove(name) })
 
-	if err == nil {
-		return nil
-	}
-
-	return ioError
+	return err
 }
 
 func withStdin(content string, action func()) error {
@@ -173,7 +166,7 @@ func TestCheckEtcdInvalid(t *testing.T) {
 	}
 
 	err = checkCmd(cmdArgs{in: &medium{typ: etcd, urls: urls, path: "/skippertest"}})
-	if err != invalidRouteExpression {
+	if err != errInvalidRouteExpression {
 		t.Error("failed to fail properly")
 	}
 }

cmd/eskip/media.go

@@ -57,17 +57,17 @@ type medium struct {
 }
 
 var (
-	tooManyInputs    = errors.New("too many inputs")
-	invalidInputType = errors.New("invalid input type")
-	missingInput     = errors.New("missing input")
+	errTooManyInputs    = errors.New("too many inputs")
+	errInvalidInputType = errors.New("invalid input type")
+	errMissingInput     = errors.New("missing input")
 )
 
 // validate medium from args, and check if it can be used
 // as input.
 // (check and print)
 func validateSelectRead(media []*medium) (a cmdArgs, err error) {
 	if len(media) > 1 {
-		err = tooManyInputs
+		err = errTooManyInputs
 		return
 	}
 
@@ -78,7 +78,7 @@ func validateSelectRead(media []*medium) (a cmdArgs, err error) {
 
 	switch media[0].typ {
 	case inlineIds, patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
-		err = invalidInputType
+		err = errInvalidInputType
 		return
 	}
 
@@ -89,19 +89,19 @@ func validateSelectRead(media []*medium) (a cmdArgs, err error) {
 // validate media from args, and check if input was specified.
 func validateSelectWrite(media []*medium) (a cmdArgs, err error) {
 	if len(media) == 0 {
-		err = missingInput
+		err = errMissingInput
 		return
 	}
 
 	if len(media) > 2 {
-		err = tooManyInputs
+		err = errTooManyInputs
 		return
 	}
 
 	for _, m := range media {
 		switch media[0].typ {
 		case inlineIds, patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
-			err = invalidInputType
+			err = errInvalidInputType
 			return
 		}
 
@@ -113,27 +113,27 @@ func validateSelectWrite(media []*medium) (a cmdArgs, err error) {
 	}
 
 	if a.in == nil {
-		err = missingInput
+		err = errMissingInput
 	}
 
 	return
 }
 
 func validateSelectDelete(media []*medium) (a cmdArgs, err error) {
 	if len(media) == 0 {
-		err = missingInput
+		err = errMissingInput
 		return
 	}
 
 	if len(media) > 2 {
-		err = tooManyInputs
+		err = errTooManyInputs
 		return
 	}
 
 	for _, m := range media {
 		switch media[0].typ {
 		case patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
-			err = invalidInputType
+			err = errInvalidInputType
 			return
 		}
 
@@ -145,7 +145,7 @@ func validateSelectDelete(media []*medium) (a cmdArgs, err error) {
 	}
 
 	if a.in == nil {
-		err = missingInput
+		err = errMissingInput
 	}
 
 	return
@@ -156,11 +156,11 @@ func validateSelectPatch(media []*medium) (a cmdArgs, err error) {
 		switch m.typ {
 		case patchPrepend, patchPrependFile, patchAppend, patchAppendFile:
 		case inlineIds:
-			err = invalidInputType
+			err = errInvalidInputType
 			return
 		default:
 			if a.in != nil {
-				err = tooManyInputs
+				err = errTooManyInputs
 				return
 			}
 

cmd/eskip/media_test.go

@@ -69,7 +69,7 @@ func TestValidateSelectMedia(t *testing.T) {
 		"check",
 		[]*medium{{}, {}},
 		true,
-		tooManyInputs,
+		errTooManyInputs,
 		nil,
 		nil,
 	}, {
@@ -78,7 +78,7 @@ func TestValidateSelectMedia(t *testing.T) {
 		"check",
 		[]*medium{{typ: inlineIds}},
 		true,
-		invalidInputType,
+		errInvalidInputType,
 		nil,
 		nil,
 	}, {
@@ -119,7 +119,7 @@ func TestValidateSelectMedia(t *testing.T) {
 		"upsert",
 		nil,
 		true,
-		missingInput,
+		errMissingInput,
 		nil,
 		nil,
 	}, {
@@ -128,7 +128,7 @@ func TestValidateSelectMedia(t *testing.T) {
 		"upsert",
 		[]*medium{{typ: stdin}, {typ: file}, {typ: etcd}},
 		true,
-		tooManyInputs,
+		errTooManyInputs,
 		nil,
 		nil,
 	}, {
@@ -137,7 +137,7 @@ func TestValidateSelectMedia(t *testing.T) {
 		"upsert",
 		[]*medium{{typ: inlineIds}},
 		true,
-		invalidInputType,
+		errInvalidInputType,
 		nil,
 		nil,
 	}, {
@@ -155,7 +155,7 @@ func TestValidateSelectMedia(t *testing.T) {
 		"delete",
 		[]*medium{{typ: innkeeper}},
 		true,
-		missingInput,
+		errMissingInput,
 		nil,
 		nil,
 	}, {
@@ -173,7 +173,7 @@ func TestValidateSelectMedia(t *testing.T) {
 		"upsert",
 		[]*medium{{typ: inlineIds}},
 		true,
-		invalidInputType,
+		errInvalidInputType,
 		nil,
 		nil,
 	}, {

cmd/eskip/readclient.go

@@ -52,7 +52,7 @@ func createReadClient(m *medium) (readClient, error) {
 		return &idsReader{ids: m.ids}, nil
 
 	default:
-		return nil, invalidInputType
+		return nil, errInvalidInputType
 	}
 }
 

cmd/eskip/writeclient.go

@@ -13,7 +13,7 @@ type writeClient interface {
 	DeleteAllIf(routes []*eskip.Route, cond eskip.RoutePredicate) error
 }
 
-var invalidOutput = errors.New("invalid output")
+var errInvalidOutput = errors.New("invalid output")
 
 func createWriteClient(out *medium) (writeClient, error) {
 	// no output, no client
@@ -29,5 +29,5 @@ func createWriteClient(out *medium) (writeClient, error) {
 			Insecure:   insecure,
 			OAuthToken: out.oauthToken})
 	}
-	return nil, invalidOutput
+	return nil, errInvalidOutput
 }