fix most linter errors

cmd/rest-server/listener_unix_test.go

@@ -61,7 +61,10 @@ func TestUnixSocket(t *testing.T) {
 				if err != nil {
 					return err
 				}
-				resp.Body.Close()
+				err = resp.Body.Close()
+				if err != nil {
+					return err
+				}
 				if resp.StatusCode != test.StatusCode {
 					return fmt.Errorf("expected %d from server, instead got %d (path %s)", test.StatusCode, resp.StatusCode, test.Path)
 				}

cmd/rest-server/main.go

@@ -22,7 +22,7 @@ import (
 type restServerApp struct {
 	CmdRoot    *cobra.Command
 	Server     restserver.Server
-	CpuProfile string
+	CPUProfile string
 
 	listenerAddressMu sync.Mutex
 	listenerAddress   net.Addr // set after startup
@@ -36,7 +36,7 @@ func newRestServerApp() *restServerApp {
 			Short:         "Run a REST server for use with restic",
 			SilenceErrors: true,
 			SilenceUsage:  true,
-			Args: func(cmd *cobra.Command, args []string) error {
+			Args: func(_ *cobra.Command, args []string) error {
 				if len(args) != 0 {
 					return fmt.Errorf("rest-server expects no arguments - unknown argument: %s", args[0])
 				}
@@ -52,7 +52,7 @@ func newRestServerApp() *restServerApp {
 	rv.CmdRoot.RunE = rv.runRoot
 	flags := rv.CmdRoot.Flags()
 
-	flags.StringVar(&rv.CpuProfile, "cpu-profile", rv.CpuProfile, "write CPU profile to file")
+	flags.StringVar(&rv.CPUProfile, "cpu-profile", rv.CPUProfile, "write CPU profile to file")
 	flags.BoolVar(&rv.Server.Debug, "debug", rv.Server.Debug, "output debug messages")
 	flags.StringVar(&rv.Server.Listen, "listen", rv.Server.Listen, "listen address")
 	flags.StringVar(&rv.Server.Log, "log", rv.Server.Log, "write HTTP requests in the combined log format to the specified `filename` (use \"-\" for logging to stdout)")
@@ -103,17 +103,19 @@ func (app *restServerApp) ListenerAddress() net.Addr {
 	return app.listenerAddress
 }
 
-func (app *restServerApp) runRoot(cmd *cobra.Command, args []string) error {
+func (app *restServerApp) runRoot(_ *cobra.Command, _ []string) error {
 	log.SetFlags(0)
 
 	log.Printf("Data directory: %s", app.Server.Path)
 
-	if app.CpuProfile != "" {
+	if app.CPUProfile != "" {
-		f, err := os.Create(app.CpuProfile)
+		f, err := os.Create(app.CPUProfile)
 		if err != nil {
 			return err
 		}
-		defer f.Close()
+		defer func() {
+			_ = f.Close()
+		}()
 
 		if err := pprof.StartCPUProfile(f); err != nil {
 			return err

cmd/rest-server/main_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -94,7 +93,7 @@ func TestTLSSettings(t *testing.T) {
 }
 
 func TestGetHandler(t *testing.T) {
-	dir, err := ioutil.TempDir("", "rest-server-test")
+	dir, err := os.MkdirTemp("", "rest-server-test")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -120,7 +119,7 @@ func TestGetHandler(t *testing.T) {
 	}
 
 	// With NoAuth = false and custom .htpasswd
-	htpFile, err := ioutil.TempFile(dir, "custom")
+	htpFile, err := os.CreateTemp(dir, "custom")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -137,7 +136,7 @@ func TestGetHandler(t *testing.T) {
 
 	// Create .htpasswd
 	htpasswd := filepath.Join(dir, ".htpasswd")
-	err = ioutil.WriteFile(htpasswd, []byte(""), 0644)
+	err = os.WriteFile(htpasswd, []byte(""), 0644)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -262,7 +261,10 @@ func TestHttpListen(t *testing.T) {
 				if err != nil {
 					return err
 				}
-				resp.Body.Close()
+				err = resp.Body.Close()
+				if err != nil {
+					return err
+				}
 				if resp.StatusCode != test.StatusCode {
 					return fmt.Errorf("expected %d from server, instead got %d (path %s)", test.StatusCode, resp.StatusCode, test.Path)
 				}

handlers.go

@@ -158,7 +158,8 @@ func join(base string, names ...string) (string, error) {
 // splitURLPath splits the URL path into a folderPath of the subrepo, and
 // a remainder that can be passed to repo.Handler.
 // Example: /foo/bar/locks/0123... will be split into:
-//          ["foo", "bar"] and "/locks/0123..."
+//
+//	["foo", "bar"] and "/locks/0123..."
 func splitURLPath(urlPath string, maxDepth int) (folderPath []string, remainder string) {
 	if !strings.HasPrefix(urlPath, "/") {
 		// Really should start with "/"

handlers_test.go

@@ -6,7 +6,6 @@ import (
 	"encoding/hex"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -165,7 +164,7 @@ func createOverwriteDeleteSeq(t testing.TB, path string, data string) []TestRequ
 	return req
 }
 
-func createTestHandler(t *testing.T, conf Server) (http.Handler, string, string, string, func()) {
+func createTestHandler(t *testing.T, conf *Server) (http.Handler, string, string, string, func()) {
 	buf := make([]byte, 32)
 	_, err := io.ReadFull(rand.Reader, buf)
 	if err != nil {
@@ -176,7 +175,7 @@ func createTestHandler(t *testing.T, conf Server) (http.Handler, string, string,
 	fileID := hex.EncodeToString(dataHash[:])
 
 	// setup the server with a local backend in a temporary directory
-	tempdir, err := ioutil.TempDir("", "rest-server-test-")
+	tempdir, err := os.MkdirTemp("", "rest-server-test-")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -190,7 +189,7 @@ func createTestHandler(t *testing.T, conf Server) (http.Handler, string, string,
 	}
 
 	conf.Path = tempdir
-	mux, err := NewHandler(&conf)
+	mux, err := NewHandler(conf)
 	if err != nil {
 		t.Fatalf("error from NewHandler: %v", err)
 	}
@@ -199,7 +198,7 @@ func createTestHandler(t *testing.T, conf Server) (http.Handler, string, string,
 
 // TestResticAppendOnlyHandler runs tests on the restic handler code, especially in append-only mode.
 func TestResticAppendOnlyHandler(t *testing.T) {
-	mux, data, fileID, _, cleanup := createTestHandler(t, Server{
+	mux, data, fileID, _, cleanup := createTestHandler(t, &Server{
 		AppendOnly:   true,
 		NoAuth:       true,
 		Debug:        true,
@@ -300,7 +299,7 @@ func createIdempotentDeleteSeq(t testing.TB, path string, data string) []TestReq
 
 // TestResticHandler runs tests on the restic handler code, especially in append-only mode.
 func TestResticHandler(t *testing.T) {
-	mux, data, fileID, _, cleanup := createTestHandler(t, Server{
+	mux, data, fileID, _, cleanup := createTestHandler(t, &Server{
 		NoAuth:       true,
 		Debug:        true,
 		PanicOnError: true,
@@ -331,7 +330,7 @@ func TestResticHandler(t *testing.T) {
 
 // TestResticErrorHandler runs tests on the restic handler error handling.
 func TestResticErrorHandler(t *testing.T) {
-	mux, _, _, tempdir, cleanup := createTestHandler(t, Server{
+	mux, _, _, tempdir, cleanup := createTestHandler(t, &Server{
 		AppendOnly: true,
 		NoAuth:     true,
 		Debug:      true,
@@ -380,7 +379,7 @@ func TestResticErrorHandler(t *testing.T) {
 }
 
 func TestEmptyList(t *testing.T) {
-	mux, _, _, _, cleanup := createTestHandler(t, Server{
+	mux, _, _, _, cleanup := createTestHandler(t, &Server{
 		AppendOnly: true,
 		NoAuth:     true,
 		Debug:      true,
@@ -404,7 +403,7 @@ func TestEmptyList(t *testing.T) {
 }
 
 func TestListWithUnexpectedFiles(t *testing.T) {
-	mux, _, _, tempdir, cleanup := createTestHandler(t, Server{
+	mux, _, _, tempdir, cleanup := createTestHandler(t, &Server{
 		AppendOnly: true,
 		NoAuth:     true,
 		Debug:      true,
@@ -510,7 +509,7 @@ func newDelayedErrorReader(err error) *delayErrorReader {
 	}
 }
 
-func (d *delayErrorReader) Read(p []byte) (int, error) {
+func (d *delayErrorReader) Read(_ []byte) (int, error) {
 	d.firstReadOnce.Do(func() {
 		// close the channel to signal that the first read has happened
 		close(d.FirstRead)
@@ -522,7 +521,7 @@ func (d *delayErrorReader) Read(p []byte) (int, error) {
 // TestAbortedRequest runs tests with concurrent upload requests for the same file.
 func TestAbortedRequest(t *testing.T) {
 	// the race condition doesn't happen for append-only repositories
-	mux, _, _, _, cleanup := createTestHandler(t, Server{
+	mux, _, _, _, cleanup := createTestHandler(t, &Server{
 		NoAuth:       true,
 		Debug:        true,
 		PanicOnError: true,

htpasswd_test.go

@@ -1,7 +1,6 @@
 package restserver
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 )
@@ -12,7 +11,7 @@ func TestValidate(t *testing.T) {
 	rawPwd := "test"
 	wrongPwd := "wrong"
 
-	tmpfile, err := ioutil.TempFile("", "rest-validate-")
+	tmpfile, err := os.CreateTemp("", "rest-validate-")
 	if err != nil {
 		t.Fatal(err)
 	}

quota/quota.go

@@ -113,7 +113,7 @@ func tallySize(path string) (int64, error) {
 		path = "."
 	}
 	var size int64
-	err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
+	err := filepath.Walk(path, func(_ string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}

repo/repo.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"math/rand"
 	"net/http"
@@ -251,7 +250,7 @@ func (h *Handler) wrapFileWriter(r *http.Request, w io.Writer) (io.Writer, int,
 }
 
 // checkConfig checks whether a configuration exists.
-func (h *Handler) checkConfig(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) checkConfig(w http.ResponseWriter, _ *http.Request) {
 	if h.opt.Debug {
 		log.Println("checkConfig()")
 	}
@@ -267,13 +266,13 @@ func (h *Handler) checkConfig(w http.ResponseWriter, r *http.Request) {
 }
 
 // getConfig allows for a config to be retrieved.
-func (h *Handler) getConfig(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) getConfig(w http.ResponseWriter, _ *http.Request) {
 	if h.opt.Debug {
 		log.Println("getConfig()")
 	}
 	cfg := h.getSubPath("config")
 
-	bytes, err := ioutil.ReadFile(cfg)
+	bytes, err := os.ReadFile(cfg)
 	if err != nil {
 		h.fileAccessError(w, err)
 		return
@@ -314,7 +313,7 @@ func (h *Handler) saveConfig(w http.ResponseWriter, r *http.Request) {
 }
 
 // deleteConfig removes a config.
-func (h *Handler) deleteConfig(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) deleteConfig(w http.ResponseWriter, _ *http.Request) {
 	if h.opt.Debug {
 		log.Println("deleteConfig()")
 	}
@@ -369,7 +368,7 @@ func (h *Handler) listBlobsV1(w http.ResponseWriter, r *http.Request) {
 	}
 	path := h.getSubPath(objectType)
 
-	items, err := ioutil.ReadDir(path)
+	items, err := os.ReadDir(path)
 	if err != nil {
 		h.fileAccessError(w, err)
 		return
@@ -383,8 +382,8 @@ func (h *Handler) listBlobsV1(w http.ResponseWriter, r *http.Request) {
 				continue
 			}
 			subpath := filepath.Join(path, i.Name())
-			var subitems []os.FileInfo
+			var subitems []os.DirEntry
-			subitems, err = ioutil.ReadDir(subpath)
+			subitems, err = os.ReadDir(subpath)
 			if err != nil {
 				h.fileAccessError(w, err)
 				return
@@ -428,7 +427,7 @@ func (h *Handler) listBlobsV2(w http.ResponseWriter, r *http.Request) {
 	}
 	path := h.getSubPath(objectType)
 
-	items, err := ioutil.ReadDir(path)
+	items, err := os.ReadDir(path)
 	if err != nil {
 		h.fileAccessError(w, err)
 		return
@@ -442,17 +441,27 @@ func (h *Handler) listBlobsV2(w http.ResponseWriter, r *http.Request) {
 				continue
 			}
 			subpath := filepath.Join(path, i.Name())
-			var subitems []os.FileInfo
+			var subitems []os.DirEntry
-			subitems, err = ioutil.ReadDir(subpath)
+			subitems, err = os.ReadDir(subpath)
 			if err != nil {
 				h.fileAccessError(w, err)
 				return
 			}
 			for _, f := range subitems {
-				blobs = append(blobs, Blob{Name: f.Name(), Size: f.Size()})
+				fi, err := f.Info()
+				if err != nil {
+					h.fileAccessError(w, err)
+					return
+				}
+				blobs = append(blobs, Blob{Name: f.Name(), Size: fi.Size()})
 			}
 		} else {
-			blobs = append(blobs, Blob{Name: i.Name(), Size: i.Size()})
+			fi, err := i.Info()
+			if err != nil {
+				h.fileAccessError(w, err)
+				return
+			}
+			blobs = append(blobs, Blob{Name: i.Name(), Size: fi.Size()})
 		}
 	}
 
@@ -652,7 +661,7 @@ func (h *Handler) saveBlob(w http.ResponseWriter, r *http.Request) {
 	h.sendMetric(objectType, BlobWrite, uint64(written))
 }
 
-// tempFile implements a custom version of ioutil.TempFile which allows modifying the file permissions
+// tempFile implements a custom version of os.CreateTemp which allows modifying the file permissions
 func tempFile(fn string, perm os.FileMode) (f *os.File, err error) {
 	for i := 0; i < 10; i++ {
 		name := fn + strconv.FormatInt(rand.Int63(), 10)