Node.js : 使用 zlib + tar 指定要解压的文件 [英] Node.js : Specify files to unzip with zlib + tar

问题描述

安装过程是下载 .tar.gz 存档，然后将文件解压缩到目标目录.但是，并非存档中的所有文件都是必需的，我想指定应提取哪些文件.天真的方法是在提取后删除不需要的文件，但我想要一种更干净"的方式并过滤掉.

An installation process is downloading a .tar.gz archive, then extract the files to a destination directory. However, not all the files in the archive are required, and I'd like to specify which files should be extracted. The naïve way would be to delete the unnecessary files after extraction, but I'd like a "cleaner" way and filter out instead.

这可能吗?

到目前为止我拥有的(相关)代码是(为了可读性而剥离)

The (relevant) code I have so far is (stripped for readability)

var fs = require('fs');
var tar = require('tar');
var zlib = require('zlib');

var log = console.log;

var tarball = 'path/to/downloaded/archive.tar.gz';
var dest = 'path/to/destination';

fs.createReadStream(tarball)
  .on("error", log)
  .pipe(zlib.Unzip())
  .pipe(tar.Extract({ path: dest }))
  .on("end", log);

谢谢.

推荐答案

它的工作原理类似于 解压模块:

It works similar to the unzip module:

var fs = require('fs');
var tar = require('tar');
var zlib = require('zlib');
var path = require('path');
var mkdirp = require('mkdirp'); // used to create directory tree

var log = console.log;

var tarball = 'path/to/downloaded/archive.tar.gz';
var dest    = 'path/to/destination';

fs.createReadStream(tarball)
  .on('error', log)
  .pipe(zlib.Unzip())
  .pipe(tar.Parse())
  .on('entry', function(entry) {
    if (/\.js$/.test(entry.path)) { // only extract JS files, for instance
      var isDir     = 'Directory' === entry.type;
      var fullpath  = path.join(dest, entry.path);
      var directory = isDir ? fullpath : path.dirname(fullpath);

      mkdirp(directory, function(err) {
        if (err) throw err;
        if (! isDir) { // should really make this an `if (isFile)` check...
          entry.pipe(fs.createWriteStream(fullpath));
        }
      });
    }
  });

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