rubyzip 压缩文件夹时遇到Errno::EACCES (Permission denied @ rb_sysopen -

最近在做下载html页面的时候,用了rubyzip包,它的说明文档里有这样一段可以直接拿来用的

require'zip'# This is a simple example which uses rubyzip to# recursively generate a zip file from the contents of# a specified directory. The directory itself is not# included in the archive, rather just its contents.#

# Usage:#  directory_to_zip = "/tmp/input"#  output_file = "/tmp/out.zip"#  zf = ZipFileGenerator.new(directory_to_zip, output_file)#  zf.write()class ZipFileGenerator

  # Initialize with the directory to zip and the location of the output archive.def initialize(input_dir, output_file)

    @input_dir = input_dir

    @output_file = output_file

  end

  # Zip the input directory.def write

    entries = Dir.entries(@input_dir) - %w(. ..)

    ::Zip::File.open(@output_file, ::Zip::File::CREATE) do |zipfile|      write_entries entries, '', zipfile

    end

  end

  private

  # A helper method to make the recursion work.def write_entries(entries, path, zipfile)

    entries.each do |e|      zipfile_path = path =='' ? e : File.join(path, e)

      disk_file_path = File.join(@input_dir, zipfile_path)

      puts "Deflating #{disk_file_path}"if File.directory? disk_file_path

        recursively_deflate_directory(disk_file_path, zipfile, zipfile_path)

      else        put_into_archive(disk_file_path, zipfile, zipfile_path)

      end

    end

  end

  def recursively_deflate_directory(disk_file_path, zipfile, zipfile_path)

    zipfile.mkdir zipfile_path

    subdir = Dir.entries(disk_file_path) - %w(. ..)

    write_entries subdir, zipfile_path, zipfile

  end

  def put_into_archive(disk_file_path, zipfile, zipfile_path)

    zipfile.get_output_stream(zipfile_path) do |f|      f.write(File.open(disk_file_path, 'rb').read)

    end

  end

end


于是按照说明直接使用,我的代码如下:

report_path ="path/folder"# 某个path下的folderoutput_file = Rails.root.join(download_path,"report.zip")

File.delete(output_file) if File.exists?(output_file)

zf = ZipFileGenerator.new(report_path, output_file)

zf.write()

这时出现了Errno::EACCES (Permission denied @ rb_sysopen的错误。

它的意思应该是没有权限打开文件。

按照这个思路分析,去排查权限的问题,但权限都是正常的,没有什么问题。

再去看说明文档,发现了其中的原由,文档里有这么一段:

# Usage:#  directory_to_zip = "/tmp/input"#  output_file = "/tmp/out.zip"#  zf = ZipFileGenerator.new(directory_to_zip, output_file)#  zf.write()

这说明directory_to_zip和output_file都是string对象。

而我传入的Rails.root.join(download_path,"report.zip"),是一个Pathname对象,这导致了错误的出现。

我们平常在rails里较为常用的Rails.root.join和File.join的区别就是返回的对象不同,并且Rails.root使用时也可以像字符一样,以致我都认为它就是返回的字符串,所以才导致了这样的错误,以后还是要仔细些才行,不要再犯同样的错误,特此mark一下。

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