restic: extract Node filesystem code to fs package

internal/fs/node_unix_test.go

@@ -0,0 +1,148 @@
+//go:build !windows
+// +build !windows
+
+package fs
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"syscall"
+	"testing"
+	"time"
+
+	"github.com/restic/restic/internal/restic"
+	rtest "github.com/restic/restic/internal/test"
+)
+
+func stat(t testing.TB, filename string) (fi os.FileInfo, ok bool) {
+	fi, err := os.Lstat(filename)
+	if err != nil && os.IsNotExist(err) {
+		return fi, false
+	}
+
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	return fi, true
+}
+
+func checkFile(t testing.TB, stat *syscall.Stat_t, node *restic.Node) {
+	t.Helper()
+	if uint32(node.Mode.Perm()) != uint32(stat.Mode&0777) {
+		t.Errorf("Mode does not match, want %v, got %v", stat.Mode&0777, node.Mode)
+	}
+
+	if node.Inode != uint64(stat.Ino) {
+		t.Errorf("Inode does not match, want %v, got %v", stat.Ino, node.Inode)
+	}
+
+	if node.DeviceID != uint64(stat.Dev) {
+		t.Errorf("Dev does not match, want %v, got %v", stat.Dev, node.DeviceID)
+	}
+
+	if node.Size != uint64(stat.Size) && node.Type != "symlink" {
+		t.Errorf("Size does not match, want %v, got %v", stat.Size, node.Size)
+	}
+
+	if node.Links != uint64(stat.Nlink) {
+		t.Errorf("Links does not match, want %v, got %v", stat.Nlink, node.Links)
+	}
+
+	if node.UID != stat.Uid {
+		t.Errorf("UID does not match, want %v, got %v", stat.Uid, node.UID)
+	}
+
+	if node.GID != stat.Gid {
+		t.Errorf("UID does not match, want %v, got %v", stat.Gid, node.GID)
+	}
+
+	// use the os dependent function to compare the timestamps
+	s, ok := toStatT(stat)
+	if !ok {
+		return
+	}
+
+	mtime := s.mtim()
+	if node.ModTime != time.Unix(mtime.Unix()) {
+		t.Errorf("ModTime does not match, want %v, got %v", time.Unix(mtime.Unix()), node.ModTime)
+	}
+
+	ctime := s.ctim()
+	if node.ChangeTime != time.Unix(ctime.Unix()) {
+		t.Errorf("ChangeTime does not match, want %v, got %v", time.Unix(ctime.Unix()), node.ChangeTime)
+	}
+
+	atime := s.atim()
+	if node.AccessTime != time.Unix(atime.Unix()) {
+		t.Errorf("AccessTime does not match, want %v, got %v", time.Unix(atime.Unix()), node.AccessTime)
+	}
+
+}
+
+func checkDevice(t testing.TB, stat *syscall.Stat_t, node *restic.Node) {
+	if node.Device != uint64(stat.Rdev) {
+		t.Errorf("Rdev does not match, want %v, got %v", stat.Rdev, node.Device)
+	}
+}
+
+func TestNodeFromFileInfo(t *testing.T) {
+	tmp := t.TempDir()
+	symlink := filepath.Join(tmp, "symlink")
+	rtest.OK(t, os.Symlink("target", symlink))
+
+	type Test struct {
+		filename string
+		canSkip  bool
+	}
+	var tests = []Test{
+		{"node_test.go", false},
+		{"/dev/sda", true},
+		{symlink, false},
+	}
+
+	// on darwin, users are not permitted to list the extended attributes of
+	// /dev/null, therefore skip it.
+	// on solaris, /dev/null is a symlink to a device node in /devices
+	// which does not support extended attributes, therefore skip it.
+	if runtime.GOOS != "darwin" && runtime.GOOS != "solaris" {
+		tests = append(tests, Test{"/dev/null", true})
+	}
+
+	for _, test := range tests {
+		t.Run("", func(t *testing.T) {
+			fi, found := stat(t, test.filename)
+			if !found && test.canSkip {
+				t.Skipf("%v not found in filesystem", test.filename)
+				return
+			}
+
+			if fi.Sys() == nil {
+				t.Skip("fi.Sys() is nil")
+				return
+			}
+
+			s, ok := fi.Sys().(*syscall.Stat_t)
+			if !ok {
+				t.Skipf("fi type is %T, not stat_t", fi.Sys())
+				return
+			}
+
+			node, err := NodeFromFileInfo(test.filename, fi, false)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			switch node.Type {
+			case "file", "symlink":
+				checkFile(t, s, node)
+			case "dev", "chardev":
+				checkFile(t, s, node)
+				checkDevice(t, s, node)
+			default:
+				t.Fatalf("invalid node type %q", node.Type)
+			}
+		})
+	}
+}