Fix some lint warnings

Signed-off-by: Cosmin Cojocar <[email protected]>

Author: ccojocar

analyzer.go

@@ -231,11 +231,11 @@ func (gosec *Analyzer) ignore(n ast.Node) ([]string, bool) {
 				gosec.stats.NumNosec++
 
 				// Pull out the specific rules that are listed to be ignored.
-				re := regexp.MustCompile("(G\\d{3})")
+				re := regexp.MustCompile(`(G\d{3})`)
 				matches := re.FindAllStringSubmatch(group.Text(), -1)
 
 				// If no specific rules were given, ignore everything.
-				if matches == nil || len(matches) == 0 {
+				if len(matches) == 0 {
 					return nil, true
 				}
 
@@ -269,7 +269,7 @@ func (gosec *Analyzer) Visit(n ast.Node) ast.Visitor {
 	}
 
 	// Now create the union of exclusions.
-	ignores := make(map[string]bool, 0)
+	ignores := map[string]bool{}
 	if len(gosec.context.Ignores) > 0 {
 		for k, v := range gosec.context.Ignores[0] {
 			ignores[k] = v

issue.go

@@ -77,8 +77,11 @@ func codeSnippet(file *os.File, start int64, end int64, n ast.Node) (string, err
 		return "", fmt.Errorf("Invalid AST node provided")
 	}
 
-	size := (int)(end - start) // Go bug, os.File.Read should return int64 ...
-	file.Seek(start, 0)        // #nosec
+	size := (int)(end - start)    // Go bug, os.File.Read should return int64 ...
+	_, err := file.Seek(start, 0) // #nosec
+	if err != nil {
+		return "", fmt.Errorf("move to the beginning of file: %v", err)
+	}
 
 	buf := make([]byte, size)
 	if nread, err := file.Read(buf); err != nil || nread != size {

rules/fileperms.go

@@ -36,11 +36,11 @@ func (r *filePermissions) ID() string {
 func getConfiguredMode(conf map[string]interface{}, configKey string, defaultMode int64) int64 {
 	var mode = defaultMode
 	if value, ok := conf[configKey]; ok {
-		switch value.(type) {
+		switch value := value.(type) {
 		case int64:
-			mode = value.(int64)
+			mode = value
 		case string:
-			if m, e := strconv.ParseInt(value.(string), 0, 64); e != nil {
+			if m, e := strconv.ParseInt(value, 0, 64); e != nil {
 				mode = defaultMode
 			} else {
 				mode = m

testutils/pkg.go

@@ -30,12 +30,6 @@ type TestPackage struct {
 // NewTestPackage will create a new and empty package. Must call Close() to cleanup
 // auxiliary files
 func NewTestPackage() *TestPackage {
-	goPath := os.Getenv("GOPATH")
-	// if user did not set GOPATH, set to the default
-	if goPath == "" {
-		goPath = build.Default.GOPATH
-	}
-
 	workingDir, err := ioutil.TempDir("", "gosecs_test")
 	if err != nil {
 		return nil