var gulp = require('gulp')
  var untar = require('gulp-untar')
 
  gulp.task('extract-archives', function () {
    return gulp.src('./archive/*.tar')
      .pipe(untar())
      .pipe(gulp.dest('./extracted'))
  })

var gulp = require('gulp')
var request = require('request')
var source = require('vinyl-source-stream')
var gunzip = require('gulp-gunzip')
var untar = require('gulp-untar')
 
gulp.task('default', function () {
  return request('http://example.org/some-file.tar.gz')
  .pipe(source('some-file.tar.gz'))
  .pipe(gunzip())
  .pipe(untar())
  .pipe(gulp.dest('output'))
})