119 lines
2.5 KiB
Go
119 lines
2.5 KiB
Go
// Copyright (C) 2015 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package osutil
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import (
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"bytes"
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"os"
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"path/filepath"
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"testing"
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)
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func TestCreateAtomicCreate(t *testing.T) {
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os.RemoveAll("testdata")
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defer os.RemoveAll("testdata")
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if err := os.Mkdir("testdata", 0755); err != nil {
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t.Fatal(err)
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}
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w, err := CreateAtomic("testdata/file")
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if err != nil {
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t.Fatal(err)
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}
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n, err := w.Write([]byte("hello"))
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if err != nil {
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t.Fatal(err)
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}
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if n != 5 {
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t.Fatal("written bytes", n, "!= 5")
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}
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if _, err := os.ReadFile("testdata/file"); err == nil {
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t.Fatal("file should not exist")
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}
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if err := w.Close(); err != nil {
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t.Fatal(err)
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}
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bs, err := os.ReadFile("testdata/file")
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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(bs, []byte("hello")) {
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t.Error("incorrect data")
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}
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}
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func TestCreateAtomicReplace(t *testing.T) {
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testCreateAtomicReplace(t, 0666)
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}
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func TestCreateAtomicReplaceReadOnly(t *testing.T) {
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testCreateAtomicReplace(t, 0444) // windows compatible read-only bits
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}
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func testCreateAtomicReplace(t *testing.T, oldPerms os.FileMode) {
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t.Helper()
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testdir, err := os.MkdirTemp("", "syncthing")
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if err != nil {
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t.Fatal(err)
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}
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testfile := filepath.Join(testdir, "testfile")
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os.RemoveAll(testdir)
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defer os.RemoveAll(testdir)
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if err := os.Mkdir(testdir, 0755); err != nil {
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t.Fatal(err)
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}
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if err := os.WriteFile(testfile, []byte("some old data"), oldPerms); err != nil {
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t.Fatal(err)
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}
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// Go < 1.14 has a bug in WriteFile where it does not use the requested
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// permissions on Windows. Chmod to make sure.
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if err := os.Chmod(testfile, oldPerms); err != nil {
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t.Fatal(err)
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}
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// Trust, but verify.
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if info, err := os.Stat(testfile); err != nil {
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t.Fatal(err)
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} else if info.Mode() != oldPerms {
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t.Fatalf("Wrong perms 0%o", info.Mode())
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}
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w, err := CreateAtomic(testfile)
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if err != nil {
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t.Fatal(err)
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}
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if _, err := w.Write([]byte("hello")); err != nil {
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t.Fatal(err)
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}
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if err := w.Close(); err != nil {
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t.Fatal(err)
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}
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bs, err := os.ReadFile(testfile)
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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(bs, []byte("hello")) {
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t.Error("incorrect data")
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}
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if info, err := os.Stat(testfile); err != nil {
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t.Fatal(err)
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} else if info.Mode() != oldPerms {
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t.Fatalf("Perms changed during atomic write: 0%o", info.Mode())
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}
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}
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