diff --git a/internal/config/config.go b/internal/config/config.go
index 7556bd8..effea09 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -280,9 +280,9 @@ func (s *Steps) UnmarshalJSON(b []byte) error {
 
 				case "run":
 					var s RunStep
-					switch stepSpec.(type) {
+					switch stepSpec := stepSpec.(type) {
 					case string:
-						s.Command = stepSpec.(string)
+						s.Command = stepSpec
 					default:
 						if err := json.Unmarshal(stepSpecRaw, &s); err != nil {
 							return err
diff --git a/internal/db/db.go b/internal/db/db.go
index e932ad7..79bb8cb 100644
--- a/internal/db/db.go
+++ b/internal/db/db.go
@@ -177,12 +177,12 @@ func (db *DB) Do(f func(tx *Tx) error) error {
 	}
 	defer func() {
 		if p := recover(); p != nil {
-			tx.Rollback()
+			_ = tx.Rollback()
 			panic(p)
 		}
 	}()
 	if err = f(tx); err != nil {
-		tx.Rollback()
+		_ = tx.Rollback()
 		return err
 	}
 	return tx.Commit()
diff --git a/internal/git-handler/handler.go b/internal/git-handler/handler.go
index 416eba8..751d2bb 100644
--- a/internal/git-handler/handler.go
+++ b/internal/git-handler/handler.go
@@ -159,6 +159,11 @@ func (h *GitSmartHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 
 	repoPath, reqType, err := MatchPath(r.URL.Path)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
 	repoAbsPath, exists, err := h.repoAbsPathFunc(h.reposDir, repoPath)
 	if err != nil {
 		if err == ErrWrongRepoPath {
@@ -207,7 +212,7 @@ func (h *GitSmartHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 
 		w.Header().Set("Content-Type", "application/x-git-"+serviceName+"-advertisement")
-		w.Write(res)
+		_, _ = w.Write(res)
 
 	case RequestTypeUploadPack:
 		w.Header().Set("Content-Type", "application/x-git-upload-pack-result")
diff --git a/internal/objectstorage/posixflat/posixflat.go b/internal/objectstorage/posixflat/posixflat.go
index 7e23336..e70afe6 100644
--- a/internal/objectstorage/posixflat/posixflat.go
+++ b/internal/objectstorage/posixflat/posixflat.go
@@ -171,7 +171,6 @@ func unescape(s string) (string, bool, error) {
 	if nc > splitLength && nc%splitLength == 2 && s[len(s)-2:] == ".f" {
 		hasFileMarker = true
 		s = s[:len(s)-2]
-		nc -= 2
 	}
 
 	if n == 0 && ns == 0 {
diff --git a/internal/testutil/utils.go b/internal/testutil/utils.go
index fd1bac9..e4ac51d 100644
--- a/internal/testutil/utils.go
+++ b/internal/testutil/utils.go
@@ -104,8 +104,8 @@ func (p *Process) Kill() {
 	if p.Cmd == nil {
 		panic(fmt.Errorf("p: %s, cmd is empty", p.uid))
 	}
-	p.Cmd.Cmd.Process.Signal(os.Kill)
-	p.Cmd.Wait()
+	_ = p.Cmd.Cmd.Process.Signal(os.Kill)
+	_ = p.Cmd.Wait()
 	p.Cmd = nil
 }
 
@@ -115,8 +115,8 @@ func (p *Process) Stop() {
 		panic(fmt.Errorf("p: %s, cmd is empty", p.uid))
 	}
 	p.Cmd.Continue()
-	p.Cmd.Cmd.Process.Signal(os.Interrupt)
-	p.Cmd.Wait()
+	_ = p.Cmd.Cmd.Process.Signal(os.Interrupt)
+	_ = p.Cmd.Wait()
 	p.Cmd = nil
 }
 
diff --git a/internal/toolbox/unarchive/unarchive.go b/internal/toolbox/unarchive/unarchive.go
index d94c6ac..c3ad26f 100644
--- a/internal/toolbox/unarchive/unarchive.go
+++ b/internal/toolbox/unarchive/unarchive.go
@@ -184,7 +184,3 @@ func writeNewHardLink(fpath string, target string) error {
 	}
 	return nil
 }
-
-func isSymlink(fi os.FileInfo) bool {
-	return fi.Mode()&os.ModeSymlink != 0
-}
diff --git a/internal/util/git.go b/internal/util/git.go
index 0be9ecd..be9bf89 100644
--- a/internal/util/git.go
+++ b/internal/util/git.go
@@ -50,7 +50,6 @@ func ParseGitURL(u string) (*url.URL, error) {
 }
 
 type Git struct {
-	cmd    *exec.Cmd
 	GitDir string
 	Env    []string
 }
diff --git a/internal/util/sha.go b/internal/util/sha.go
index 16788bb..0e8648b 100644
--- a/internal/util/sha.go
+++ b/internal/util/sha.go
@@ -24,7 +24,7 @@ import (
 func EncodeSha1Hex(str string) string {
 	h := sha1.New()
 	// TODO(sgotti) must handle write errors
-	h.Write([]byte(str))
+	_, _ = h.Write([]byte(str))
 	return hex.EncodeToString(h.Sum(nil))
 }
 
@@ -32,6 +32,6 @@ func EncodeSha1Hex(str string) string {
 func EncodeSha256Hex(str string) string {
 	h := sha256.New()
 	// TODO(sgotti) must handle write errors
-	h.Write([]byte(str))
+	_, _ = h.Write([]byte(str))
 	return hex.EncodeToString(h.Sum(nil))
 }
diff --git a/internal/util/slice.go b/internal/util/slice.go
index 4bfd609..ea02c78 100644
--- a/internal/util/slice.go
+++ b/internal/util/slice.go
@@ -51,8 +51,8 @@ func CompareStringSliceNoOrder(a []string, b []string) bool {
 	a = append([]string(nil), a...)
 	b = append([]string(nil), b...)
 
-	sort.Sort(sort.StringSlice(a))
-	sort.Sort(sort.StringSlice(b))
+	sort.Strings(a)
+	sort.Strings(b)
 
 	for i, v := range a {
 		if v != b[i] {