gofmt_unix_test.go

Documentation: cmd/gofmt

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build unix
     6  
     7  package main
     8  
     9  import (
    10  	"os"
    11  	"path/filepath"
    12  	"strings"
    13  	"testing"
    14  	"time"
    15  )
    16  
    17  func TestPermissions(t *testing.T) {
    18  	if os.Getuid() == 0 {
    19  		t.Skip("skipping permission test when running as root")
    20  	}
    21  
    22  	dir := t.TempDir()
    23  	fn := filepath.Join(dir, "perm.go")
    24  
    25  	// Create a file that needs formatting without write permission.
    26  	if err := os.WriteFile(filepath.Join(fn), []byte("  package main"), 0o400); err != nil {
    27  		t.Fatal(err)
    28  	}
    29  
    30  	// Set mtime of the file in the past.
    31  	past := time.Now().Add(-time.Hour)
    32  	if err := os.Chtimes(fn, past, past); err != nil {
    33  		t.Fatal(err)
    34  	}
    35  
    36  	info, err := os.Stat(fn)
    37  	if err != nil {
    38  		t.Fatal(err)
    39  	}
    40  
    41  	defer func() { *write = false }()
    42  	*write = true
    43  
    44  	initParserMode()
    45  	initRewrite()
    46  
    47  	const maxWeight = 2 << 20
    48  	var buf, errBuf strings.Builder
    49  	s := newSequencer(maxWeight, &buf, &errBuf)
    50  	s.Add(fileWeight(fn, info), func(r *reporter) error {
    51  		return processFile(fn, info, nil, r)
    52  	})
    53  	if s.GetExitCode() == 0 {
    54  		t.Fatal("rewrite of read-only file succeeded unexpectedly")
    55  	}
    56  	if errBuf.Len() > 0 {
    57  		t.Log(errBuf)
    58  	}
    59  
    60  	info, err = os.Stat(fn)
    61  	if err != nil {
    62  		t.Fatal(err)
    63  	}
    64  	if !info.ModTime().Equal(past) {
    65  		t.Errorf("after rewrite mod time is %v, want %v", info.ModTime(), past)
    66  	}
    67  }
    68
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