fix: Fix --file-patterns flag (#2625)

integration/fs_test.go

@@ -23,6 +23,7 @@ func TestFilesystem(t *testing.T) {
 		listAllPkgs    bool
 		input          string
 		secretConfig   string
+		filePatterns   []string
 	}
 	tests := []struct {
 		name   string
@@ -79,6 +80,16 @@ func TestFilesystem(t *testing.T) {
 			},
 			golden: "testdata/dockerfile.json.golden",
 		},
+		{
+			name: "dockerfile with custom file pattern",
+			args: args{
+				securityChecks: "config",
+				input:          "testdata/fixtures/fs/dockerfile_file_pattern",
+				namespaces:     []string{"testing"},
+				filePatterns:   []string{"dockerfile:Customfile"},
+			},
+			golden: "testdata/dockerfile_file_pattern.json.golden",
+		},
 		{
 			name: "dockerfile with rule exception",
 			args: args{
@@ -178,6 +189,12 @@ func TestFilesystem(t *testing.T) {
 				defer os.Remove(trivyIgnore)
 			}
 
+			if len(tt.args.filePatterns) != 0 {
+				for _, filePattern := range tt.args.filePatterns {
+					osArgs = append(osArgs, "--file-patterns", filePattern)
+				}
+			}
+
 			// Setup the output file
 			outputFile := filepath.Join(t.TempDir(), "output.json")
 			if *update {