.golangci.yml: properly enable revive linter and fix all the warnings it detects

.golangci.yml

@@ -1,6 +1,7 @@
 run:
   timeout: 2m
 
+linters:
   enable:
   - revive
 
@@ -9,6 +10,9 @@ issues:
   - linters:
     - staticcheck
     text: "SA(4003|1019|5011):"
+  include:
+  - EXC0012
+  - EXC0014
 
 linters-settings:
   errcheck:

app/vmbackup/main.go

@@ -51,27 +51,27 @@ func main() {
 
 	if len(*snapshotCreateURL) > 0 {
 		// create net/url object
-		createUrl, err := url.Parse(*snapshotCreateURL)
+		createURL, err := url.Parse(*snapshotCreateURL)
 		if err != nil {
 			logger.Fatalf("cannot parse snapshotCreateURL: %s", err)
 		}
 		if len(*snapshotName) > 0 {
 			logger.Fatalf("-snapshotName shouldn't be set if -snapshot.createURL is set, since snapshots are created automatically in this case")
 		}
-		logger.Infof("Snapshot create url %s", createUrl.Redacted())
+		logger.Infof("Snapshot create url %s", createURL.Redacted())
 		if len(*snapshotDeleteURL) <= 0 {
 			err := flag.Set("snapshot.deleteURL", strings.Replace(*snapshotCreateURL, "/create", "/delete", 1))
 			if err != nil {
 				logger.Fatalf("Failed to set snapshot.deleteURL flag: %v", err)
 			}
 		}
-		deleteUrl, err := url.Parse(*snapshotDeleteURL)
+		deleteURL, err := url.Parse(*snapshotDeleteURL)
 		if err != nil {
 			logger.Fatalf("cannot parse snapshotDeleteURL: %s", err)
 		}
-		logger.Infof("Snapshot delete url %s", deleteUrl.Redacted())
+		logger.Infof("Snapshot delete url %s", deleteURL.Redacted())
 
-		name, err := snapshot.Create(createUrl.String())
+		name, err := snapshot.Create(createURL.String())
 		if err != nil {
 			logger.Fatalf("cannot create snapshot: %s", err)
 		}
@@ -81,7 +81,7 @@ func main() {
 		}
 
 		defer func() {
-			err := snapshot.Delete(deleteUrl.String(), name)
+			err := snapshot.Delete(deleteURL.String(), name)
 			if err != nil {
 				logger.Fatalf("cannot delete snapshot: %s", err)
 			}

app/vmctl/backoff/backoff.go

@@ -19,6 +19,7 @@ const (
 // retryableFunc describes call back which will repeat on errors
 type retryableFunc func() error
 
+// ErrBadRequest is an error returned on bad request
 var ErrBadRequest = errors.New("bad request")
 
 // Backoff describes object with backoff policy params

app/vmselect/promql/aggr.go

@@ -783,7 +783,7 @@ func fillNaNsAtIdx(idx int, k float64, tss []*timeseries) {
 	}
 }
 
-func getIntK(k float64, kMax int) int {
+func getIntK(k float64, max int) int {
 	if math.IsNaN(k) {
 		return 0
 	}
@@ -791,8 +791,8 @@ func getIntK(k float64, kMax int) int {
 	if kn < 0 {
 		return 0
 	}
-	if kn > kMax {
-		return kMax
+	if kn > max {
+		return max
 	}
 	return kn
 }

lib/awsapi/sign.go

@@ -84,10 +84,10 @@ func signRequestWithTime(req *http.Request, service, region, payloadHash string,
 }
 
 func getSignatureKey(key, datestamp, region, service string) string {
-	kDate := hmacBin("AWS4"+key, datestamp)
-	kRegion := hmacBin(kDate, region)
-	kService := hmacBin(kRegion, service)
-	return hmacBin(kService, "aws4_request")
+	dateKey := hmacBin("AWS4"+key, datestamp)
+	regionKey := hmacBin(dateKey, region)
+	serviceKey := hmacBin(regionKey, service)
+	return hmacBin(serviceKey, "aws4_request")
 }
 
 func hashHex(s string) string {

lib/fs/fs.go

@@ -468,6 +468,7 @@ func isHTTPURL(targetURL string) bool {
 
 }
 
-func IsScheduledForRemoval(name string) bool {
-	return strings.Contains(name, ".must-remove.")
+// IsScheduledForRemoval returns true if the filename contains .must-remove. substring
+func IsScheduledForRemoval(filename string) bool {
+	return strings.Contains(filename, ".must-remove.")
 }

lib/promscrape/client.go

@@ -79,7 +79,7 @@ func concatTwoStrings(x, y string) string {
 	return s
 }
 
-func newClient(sw *ScrapeWork, ctx context.Context) *client {
+func newClient(ctx context.Context, sw *ScrapeWork) *client {
 	var u fasthttp.URI
 	u.Update(sw.ScrapeURL)
 	hostPort := string(u.Host())

lib/promscrape/discovery/nomad/service.go

@@ -22,6 +22,8 @@ func getServiceLabels(cfg *apiConfig) []*promutils.Labels {
 	return ms
 }
 
+// ServiceList is a list of Nomad services.
+// See https://developer.hashicorp.com/nomad/api-docs/services#list-services
 type ServiceList struct {
 	Namespace string `json:"Namespace"`
 	Services  []struct {

lib/promscrape/scraper.go

@@ -442,7 +442,7 @@ func newScraper(sw *ScrapeWork, group string, pushData func(at *auth.Token, wr *
 		cancel:    cancel,
 		stoppedCh: make(chan struct{}),
 	}
-	c := newClient(sw, ctx)
+	c := newClient(ctx, sw)
 	sc.sw.Config = sw
 	sc.sw.ScrapeGroup = group
 	sc.sw.ReadData = c.ReadData

lib/protoparser/common/vmproto_handshake.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 )
 
-// HandleVMProtoClientHashake returns true if the server at remoteWriteURL supports VictoriaMetrics remote write protocol.
+// HandleVMProtoClientHandshake returns true if the server at remoteWriteURL supports VictoriaMetrics remote write protocol.
 func HandleVMProtoClientHandshake(remoteWriteURL string, doRequest func(handshakeURL string) (*http.Response, error)) bool {
 	u := remoteWriteURL
 	if strings.Contains(u, "?") {