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guest.js
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'use strict'
const fs = require('fs')
const path = require('path')
const cp = require('child_process')
// TODO: fix permissions of WORKDIR in prebuild images
const cwd = '/home/node/app'
const files = JSON.parse(process.env.PREBUILDIFY_CROSS_FILES)
const argv = process.argv.slice(2)
// Copy host files to working directory
for (const file of files) {
const a = path.join('/input', file)
const b = path.join(cwd, file)
fs.mkdirSync(path.dirname(b), { recursive: true })
fs.copyFileSync(a, b, fs.constants.COPYFILE_EXCL)
fs.chmodSync(b, 0o644)
}
// Use node_modules of host to avoid a second install step
fs.symlinkSync('/input/node_modules', path.join(cwd, 'node_modules'))
const stdio = ['ignore', 2, 2]
const res = cp.spawnSync('npx', ['--no-install', 'prebuildify', ...argv], { cwd, stdio })
if (res.status) process.exit(res.status)
if (res.error) throw res.error
// Write tarball to stdout. With this approach we don't need
// a writable volume and can avoid messing with permissions.
require('tar-fs').pack(path.join(cwd, 'prebuilds')).pipe(process.stdout)