func()

in internal/vfs/zip/archive.go [252:295]

• 33 lines of code
• 9 McCabe index (conditional complexity)

func (a *zipArchive) Readlink(ctx context.Context, name string) (string, error) {
	file := a.findFile(name)
	if file == nil {
		if a.findDirectory(name) != nil {
			return "", errNotSymlink
		}
		return "", os.ErrNotExist
	}

	if file.FileInfo().Mode()&os.ModeSymlink != os.ModeSymlink {
		return "", errNotSymlink
	}

	symlinkValue, err := a.fs.readlinkCache.FindOrFetch(a.cacheNamespace, name, func() (interface{}, error) {
		rc, err := file.Open()
		if err != nil {
			return nil, err
		}
		defer rc.Close()

		var link [maxSymlinkSize + 1]byte

		// read up to len(symlink) bytes from the link file
		n, err := io.ReadFull(rc, link[:])
		if err != nil && !errors.Is(err, io.ErrUnexpectedEOF) {
			// if err == io.ErrUnexpectedEOF the link is smaller than len(symlink) so it's OK to not return it
			return nil, err
		}

		return string(link[:n]), nil
	})
	if err != nil {
		return "", err
	}

	symlink := symlinkValue.(string)

	// return errSymlinkSize if the number of bytes read from the link is too big
	if len(symlink) > maxSymlinkSize {
		return "", errSymlinkSize
	}

	return symlink, nil
}