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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package robustio_test
import (
"os"
"path/filepath"
"runtime"
"testing"
"time"
"golang.org/x/tools/internal/robustio"
)
func checkOSLink(t *testing.T, err error) {
if err == nil {
return
}
t.Helper()
switch runtime.GOOS {
case "aix", "darwin", "dragonfly", "freebsd", "illumos", "linux", "netbsd", "openbsd", "solaris":
// Non-mobile OS known to always support os.Symlink and os.Link.
t.Fatal(err)
default:
t.Skipf("skipping due to error on %v: %v", runtime.GOOS, err)
}
}
func TestFileInfo(t *testing.T) {
// A nonexistent file has no ID.
nonexistent := filepath.Join(t.TempDir(), "nonexistent")
if _, _, err := robustio.GetFileID(nonexistent); err == nil {
t.Fatalf("GetFileID(nonexistent) succeeded unexpectedly")
}
// A regular file has an ID.
real := filepath.Join(t.TempDir(), "real")
if err := os.WriteFile(real, nil, 0644); err != nil {
t.Fatalf("can't create regular file: %v", err)
}
realID, realMtime, err := robustio.GetFileID(real)
if err != nil {
t.Fatalf("can't get ID of regular file: %v", err)
}
// Sleep so that we get a new mtime for subsequent writes.
time.Sleep(2 * time.Second)
// A second regular file has a different ID.
real2 := filepath.Join(t.TempDir(), "real2")
if err := os.WriteFile(real2, nil, 0644); err != nil {
t.Fatalf("can't create second regular file: %v", err)
}
real2ID, real2Mtime, err := robustio.GetFileID(real2)
if err != nil {
t.Fatalf("can't get ID of second regular file: %v", err)
}
if realID == real2ID {
t.Errorf("realID %+v == real2ID %+v", realID, real2ID)
}
if realMtime.Equal(real2Mtime) {
t.Errorf("realMtime %v == real2Mtime %v", realMtime, real2Mtime)
}
// A symbolic link has the same ID as its target.
t.Run("symlink", func(t *testing.T) {
symlink := filepath.Join(t.TempDir(), "symlink")
checkOSLink(t, os.Symlink(real, symlink))
symlinkID, symlinkMtime, err := robustio.GetFileID(symlink)
if err != nil {
t.Fatalf("can't get ID of symbolic link: %v", err)
}
if realID != symlinkID {
t.Errorf("realID %+v != symlinkID %+v", realID, symlinkID)
}
if !realMtime.Equal(symlinkMtime) {
t.Errorf("realMtime %v != symlinkMtime %v", realMtime, symlinkMtime)
}
})
// Two hard-linked files have the same ID.
t.Run("hardlink", func(t *testing.T) {
hardlink := filepath.Join(t.TempDir(), "hardlink")
checkOSLink(t, os.Link(real, hardlink))
hardlinkID, hardlinkMtime, err := robustio.GetFileID(hardlink)
if err != nil {
t.Fatalf("can't get ID of hard link: %v", err)
}
if realID != hardlinkID {
t.Errorf("realID %+v != hardlinkID %+v", realID, hardlinkID)
}
if !realMtime.Equal(hardlinkMtime) {
t.Errorf("realMtime %v != hardlinkMtime %v", realMtime, hardlinkMtime)
}
})
}
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