Lint: Fix linter errors

Signed-off-by: Knut Ahlers <knut@ahlers.me>

api.go

@@ -136,7 +136,7 @@ func handleCatalogGetVersion(w http.ResponseWriter, r *http.Request) {
 	}
 
 	w.Header().Set("Content-Type", "text/plain")
-	fmt.Fprint(w, cm.CurrentVersion)
+	fmt.Fprint(w, cm.CurrentVersion) //nolint:errcheck
 }
 
 func handleCatalogList(w http.ResponseWriter, _ *http.Request) {

internal/badge/badge.go

@@ -46,7 +46,7 @@ func Create(title, text, color string) []byte {
 	titleW, _ := calculateTextWidth(title)
 	textW, _ := calculateTextWidth(text)
 
-	width := titleW + textW + 4*xSpacing //nolint:gomnd
+	width := titleW + textW + 4*xSpacing //nolint:mnd
 
 	t, _ := assets.ReadFile("badge.svg.tpl")
 	tpl, _ := template.New("svg").Parse(string(t))

internal/database/db.go

@@ -118,4 +118,6 @@ func (c Client) initDB() error {
 	return nil
 }
 
-func (l logwrap) Printf(f string, v ...interface{}) { fmt.Fprintf(l.l, f, v...) }
+func (l logwrap) Printf(f string, v ...interface{}) {
+	fmt.Fprintf(l.l, f, v...) //nolint:errcheck
+}

internal/fetcher/html.go

@@ -53,7 +53,7 @@ func (HTMLFetcher) FetchVersion(_ context.Context, attrs *fieldcollection.FieldC
 	}
 
 	match := regexp.MustCompile(attrs.MustString("regex", &htmlFetcherDefaultRegex)).FindStringSubmatch(node.Data)
-	if len(match) < 2 { //nolint:gomnd // Simple count of fields, no need for constant
+	if len(match) < 2 { //nolint:mnd // Simple count of fields, no need for constant
 		return "", time.Time{}, errors.New("regular expression did not yield version")
 	}
 

internal/fetcher/json.go

@@ -97,7 +97,7 @@ func (JSONFetcher) FetchVersion(ctx context.Context, attrs *fieldcollection.Fiel
 	}
 
 	match := regexp.MustCompile(attrs.MustString("regex", &jsonFetcherDefaultRegex)).FindStringSubmatch(node.Data)
-	if len(match) < 2 { //nolint:gomnd // Simple count of fields, no need for constant
+	if len(match) < 2 { //nolint:mnd // Simple count of fields, no need for constant
 		return "", time.Time{}, errors.New("regular expression did not yield version")
 	}
 

scheduler.go

@@ -3,7 +3,6 @@ package main
 import (
 	"context"
 	"crypto/md5" //#nosec G501 // Used to derive a static jitter checksum, not cryptographically
-	"fmt"
 	"math"
 	"strings"
 	"time"
@@ -120,12 +119,10 @@ func nextCheckTime(ce *database.CatalogEntry, lastCheck *time.Time) time.Time {
 		return time.Now()
 	}
 
-	hash := md5.New() //#nosec G401 // Used to derive a static jitter checksum, not cryptographically
-	fmt.Fprint(hash, ce.Key())
-
 	var jitter int64
-	for i, c := range hash.Sum(nil) {
-		jitter += int64(c) * int64(math.Pow(10, float64(i))) //nolint:gomnd // No need for constant here
+	//#nosec G401 // Used to derive a static jitter checksum, not cryptographically
+	for i, c := range md5.Sum([]byte(ce.Key())) {
+		jitter += int64(c) * int64(math.Pow(10, float64(i))) //nolint:mnd // No need for constant here
 	}
 
 	next := lastCheck.