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114 lines
3.1 KiB
114 lines
3.1 KiB
package os
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestCopyFile(t *testing.T) {
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tmpfile, err := ioutil.TempFile("", "example")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(tmpfile.Name())
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content := []byte("hello world")
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if _, err := tmpfile.Write(content); err != nil {
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t.Fatal(err)
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}
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copyfile := fmt.Sprintf("%s.copy", tmpfile.Name())
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if err := CopyFile(tmpfile.Name(), copyfile); err != nil {
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t.Fatal(err)
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}
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if _, err := os.Stat(copyfile); os.IsNotExist(err) {
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t.Fatal("copy should exist")
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}
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data, err := ioutil.ReadFile(copyfile)
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(data, content) {
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t.Fatalf("copy file content differs: expected %v, got %v", content, data)
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}
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os.Remove(copyfile)
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}
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func TestEnsureDir(t *testing.T) {
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tmp, err := ioutil.TempDir("", "ensure-dir")
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require.NoError(t, err)
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defer os.RemoveAll(tmp)
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// Should be possible to create a new directory.
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err = EnsureDir(filepath.Join(tmp, "dir"), 0755)
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require.NoError(t, err)
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require.DirExists(t, filepath.Join(tmp, "dir"))
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// Should succeed on existing directory.
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err = EnsureDir(filepath.Join(tmp, "dir"), 0755)
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require.NoError(t, err)
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// Should fail on file.
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err = ioutil.WriteFile(filepath.Join(tmp, "file"), []byte{}, 0644)
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require.NoError(t, err)
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err = EnsureDir(filepath.Join(tmp, "file"), 0755)
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require.Error(t, err)
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// Should allow symlink to dir.
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err = os.Symlink(filepath.Join(tmp, "dir"), filepath.Join(tmp, "linkdir"))
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require.NoError(t, err)
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err = EnsureDir(filepath.Join(tmp, "linkdir"), 0755)
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require.NoError(t, err)
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// Should error on symlink to file.
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err = os.Symlink(filepath.Join(tmp, "file"), filepath.Join(tmp, "linkfile"))
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require.NoError(t, err)
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err = EnsureDir(filepath.Join(tmp, "linkfile"), 0755)
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require.Error(t, err)
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}
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// Ensure that using CopyFile does not truncate the destination file before
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// the origin is positively a non-directory and that it is ready for copying.
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// See https://github.com/tendermint/tendermint/issues/6427
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func TestTrickedTruncation(t *testing.T) {
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tmpDir, err := ioutil.TempDir(os.TempDir(), "pwn_truncate")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(tmpDir)
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originalWALPath := filepath.Join(tmpDir, "wal")
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originalWALContent := []byte("I AM BECOME DEATH, DESTROYER OF ALL WORLDS!")
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if err := ioutil.WriteFile(originalWALPath, originalWALContent, 0755); err != nil {
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t.Fatal(err)
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}
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// 1. Sanity check.
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readWAL, err := ioutil.ReadFile(originalWALPath)
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(readWAL, originalWALContent) {
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t.Fatalf("Cannot proceed as the content does not match\nGot: %q\nWant: %q", readWAL, originalWALContent)
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}
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// 2. Now cause the truncation of the original file.
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// It is absolutely legal to invoke os.Open on a directory.
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if err := CopyFile(tmpDir, originalWALPath); err == nil {
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t.Fatal("Expected an error")
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}
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// 3. Check the WAL's content
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reReadWAL, err := ioutil.ReadFile(originalWALPath)
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(reReadWAL, originalWALContent) {
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t.Fatalf("Oops, the WAL's content was changed :(\nGot: %q\nWant: %q", reReadWAL, originalWALContent)
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}
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}
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