untar-memory/lib/index.js

Untar a tarball to an in-memory filesystem

var ref = require('fs');
var createReadStream = ref.createReadStream;
var concat = require('concat-stream')
var gunzip = require('gunzip-maybe')
var MemoryFs = require('memory-fs')
var fileType = require('file-type')
var ref$1 = require('path');
var dirname = ref$1.dirname;
var tar = require('tar')

module.exports = untarToMemory

function untarToMemory (file, mfs) {
  var tarball = typeof file === 'string'
    ? createReadStream(file)
    : file

  mfs = mfs || new MemoryFs()

  return new Promise(function (resolve, reject) {
    tarball
      .pipe(gunzip())
      .pipe(tar.Parse())
      .on('entry', function (entry) {
        var path = '/' + entry.props.path
        mfs.mkdirpSync(dirname(path))

        entry.pipe(concat(function (buf) {
          var encoding = fileType(buf) ? 'binary' : 'utf8'
          mfs.writeFileSync(path, buf, encoding)
        }))
      })
      .on('end', function () { return resolve(mfs); })
      .on('error', reject)
  })
}