// exists but was not completely populated.
//
// DownloadDirPartialError is equivalent to fs.ErrNotExist.
type DownloadDirPartialError struct {
	Dir string
	Err error
}

func (e *DownloadDirPartialError) Error() string     { return fmt.Sprintf("%s: %v", e.Dir, e.Err) }
func (e *DownloadDirPartialError) Is(err error) bool { return err == fs.ErrNotExist }

// lockVersion locks a file within the module cache that guards the downloading

func (r errRepo) GoMod(ctx context.Context, version string) ([]byte, error)      { return nil, r.err }
func (r errRepo) Zip(ctx context.Context, dst io.Writer, version string) error   { return r.err }

// A notExistError is like fs.ErrNotExist, but with a custom message
type notExistError struct {
	err error
}

func notExistErrorf(format string, args ...any) error {
	return notExistError{fmt.Errorf(format, args...)}
}

func (f *Form) RemoveAll() error {
	var err error
	for _, fhs := range f.File {
		for _, fh := range fhs {
			if fh.tmpfile != "" {
				e := os.Remove(fh.tmpfile)
				if e != nil && !errors.Is(e, os.ErrNotExist) && err == nil {
					err = e
				}
			}
		}
	}
	return err
}

// A FileHeader describes a file part of a multipart request.
type FileHeader struct {
	Filename string

			goVersion := gover.GoModLookup(data, "go")
			if gover.Compare(goVersion, gover.Local()) > 0 {
				return "", &gover.TooNewError{What: mod.String(), GoVersion: goVersion}
			}
		} else if !errors.Is(err, fs.ErrNotExist) {
			return "", err
		}

		return dir, nil
	})
}

func download(ctx context.Context, mod module.Version) (dir string, err error) {
	ctx, span := trace.StartSpan(ctx, "modfetch.download "+mod.String())

		vendorMeta = make(map[module.Version]vendorMetadata)
		vendorFile := filepath.Join(vendorDir, "modules.txt")
		data, err := os.ReadFile(vendorFile)
		if err != nil {
			if !errors.Is(err, fs.ErrNotExist) {
				base.Fatalf("go: %s", err)
			}
			return
		}

		var mod module.Version
		for _, line := range strings.Split(string(data), "\n") {
			if strings.HasPrefix(line, "# ") {
				f := strings.Fields(line)

}

func (e Errno) Is(target error) bool {
	switch target {
	case oserror.ErrPermission:
		return e == EACCES || e == EPERM
	case oserror.ErrExist:
		return e == EEXIST || e == ENOTEMPTY
	case oserror.ErrNotExist:
		return e == ENOENT
	case errors.ErrUnsupported:
		return e == ENOSYS
	}
	return false
}

func (e Errno) Temporary() bool {
	return e == EINTR || e == EMFILE || e.Timeout()
}

	oldStat := *LstatP
	defer func() { *LstatP = oldStat }()
	*LstatP = func(name string) (FileInfo, error) {
		if strings.HasSuffix(name, "some-file") {
			// Act like it's been deleted.
			return nil, ErrNotExist
		}
		return oldStat(name)
	}
	dir := newDir("TestReaddirRemoveRace", t)
	defer RemoveAll(dir)
	if err := WriteFile(filepath.Join(dir, "some-file"), []byte("hello"), 0644); err != nil {
		t.Fatal(err)
	}

	if err != nil {
		return nil, err
	}

	if object == "" {
		ok, err := clnt.BucketExists(context.Background(), bucket)
		if err != nil {
			return nil, err
		}
		if !ok {
			return nil, os.ErrNotExist
		}
		return &minioFileInfo{
			p:     pathClean(bucket),
			info:  minio.ObjectInfo{Key: bucket},
			isDir: true,
		}, nil
	}

				return
			}
			p = filepath.Join("/sys/fs/cgroup", unified, "memory.swap.max")
		}
		if _, err := os.Stat(p); err != nil {
			if !errors.Is(err, os.ErrNotExist) {
				klog.V(5).ErrorS(err, warn)
			}
			return
		}
		swapControllerAvailability = true
	})
	return swapControllerAvailability
}

type swapConfigurationHelper struct {

	}
	if isPresent(EnvKMSSecretKeyFile) {
		if filename := os.Getenv(EnvKMSSecretKeyFile); filename == "" {
			os.Unsetenv(EnvKMSSecretKeyFile)
		} else if _, err := os.Stat(filename); errors.Is(err, os.ErrNotExist) {
			os.Unsetenv(EnvKMSSecretKeyFile)
		}
	}
	// Now, the static key env. vars are only present if they contain explicit
	// values.
	staticKeyPresent := isPresent(EnvKMSSecretKey, EnvKMSSecretKeyFile)