uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/build-support/node/fetch-yarn-deps/index.js

@@ -0,0 +1,198 @@
+#!/usr/bin/env node
+'use strict'
+
+const fs = require('fs')
+const crypto = require('crypto')
+const process = require('process')
+const https = require('https')
+const child_process = require('child_process')
+const path = require('path')
+const lockfile = require('./yarnpkg-lockfile.js')
+const { promisify } = require('util')
+const url = require('url')
+
+const execFile = promisify(child_process.execFile)
+
+const exec = async (...args) => {
+	const res = await execFile(...args)
+	if (res.error) throw new Error(res.stderr)
+	return res
+}
+
+// This has to match the logic in pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/urlToName.js
+// so that fixup_yarn_lock produces the same paths
+const urlToName = url => {
+	const isCodeloadGitTarballUrl = url.startsWith('https://codeload.github.com/') && url.includes('/tar.gz/')
+
+	if (url.startsWith('git+') || isCodeloadGitTarballUrl) {
+		return path.basename(url)
+	} else {
+		return url
+			.replace(/https:\/\/(.)*(.com)\//g, '') // prevents having long directory names
+			.replace(/[@/%:-]/g, '_') // replace @ and : and - and % characters with underscore
+	}
+}
+
+const downloadFileHttps = (fileName, url, expectedHash) => {
+	return new Promise((resolve, reject) => {
+		https.get(url, (res) => {
+			const file = fs.createWriteStream(fileName)
+			const hash = crypto.createHash('sha1')
+			res.pipe(file)
+			res.pipe(hash).setEncoding('hex')
+			res.on('end', () => {
+				file.close()
+				const h = hash.read()
+				if (h != expectedHash) return reject(new Error(`hash mismatch, expected ${expectedHash}, got ${h}`))
+				resolve()
+			})
+                        res.on('error', e => reject(e))
+		})
+	})
+}
+
+const downloadGit = async (fileName, url, rev) => {
+	await exec('nix-prefetch-git', [
+		'--out', fileName + '.tmp',
+		'--url', url,
+		'--rev', rev,
+		'--builder'
+	])
+
+	await exec('tar', [
+		// hopefully make it reproducible across runs and systems
+		'--owner=0', '--group=0', '--numeric-owner', '--format=gnu', '--sort=name', '--mtime=@1',
+
+		// Set u+w because tar-fs can't unpack archives with read-only dirs: https://github.com/mafintosh/tar-fs/issues/79
+		'--mode', 'u+w',
+
+		'-C', fileName + '.tmp',
+		'-cf', fileName, '.'
+	])
+
+	await exec('rm', [ '-rf', fileName + '.tmp', ])
+}
+
+const isGitUrl = pattern => {
+	// https://github.com/yarnpkg/yarn/blob/3119382885ea373d3c13d6a846de743eca8c914b/src/resolvers/exotics/git-resolver.js#L15-L47
+	const GIT_HOSTS = ['github.com', 'gitlab.com', 'bitbucket.com', 'bitbucket.org']
+	const GIT_PATTERN_MATCHERS = [/^git:/, /^git\+.+:/, /^ssh:/, /^https?:.+\.git$/, /^https?:.+\.git#.+/]
+
+	for (const matcher of GIT_PATTERN_MATCHERS) if (matcher.test(pattern)) return true
+
+	const {hostname, path} = url.parse(pattern)
+	if (hostname && path && GIT_HOSTS.indexOf(hostname) >= 0
+		// only if dependency is pointing to a git repo,
+		// e.g. facebook/flow and not file in a git repo facebook/flow/archive/v1.0.0.tar.gz
+		&& path.split('/').filter(p => !!p).length === 2
+	) return true
+
+	return false
+}
+
+const downloadPkg = (pkg, verbose) => {
+	const [ url, hash ] = pkg.resolved.split('#')
+	if (verbose) console.log('downloading ' + url)
+	const fileName = urlToName(url)
+	if (url.startsWith('https://codeload.github.com/') && url.includes('/tar.gz/')) {
+		const s = url.split('/')
+		downloadGit(fileName, `https://github.com/${s[3]}/${s[4]}.git`, s[6])
+	} else if (isGitUrl(url)) {
+		return downloadGit(fileName, url.replace(/^git\+/, ''), hash)
+	} else if (url.startsWith('https://')) {
+		return downloadFileHttps(fileName, url, hash)
+	} else if (url.startsWith('file:')) {
+		console.warn(`ignoring unsupported file:path url "${url}"`)
+	} else {
+		throw new Error('don\'t know how to download "' + url + '"')
+	}
+}
+
+const performParallel = tasks => {
+	const worker = async () => {
+		while (tasks.length > 0) await tasks.shift()()
+	}
+
+	const workers = []
+	for (let i = 0; i < 4; i++) {
+		workers.push(worker())
+	}
+
+	return Promise.all(workers)
+}
+
+const prefetchYarnDeps = async (lockContents, verbose) => {
+	const lockData = lockfile.parse(lockContents)
+	const tasks = Object.values(
+		Object.entries(lockData.object)
+		.map(([key, value]) => {
+			return { key, ...value }
+		})
+		.reduce((out, pkg) => {
+			out[pkg.resolved] = pkg
+			return out
+		}, {})
+	)
+		.map(pkg => () => downloadPkg(pkg, verbose))
+
+	await performParallel(tasks)
+	await fs.promises.writeFile('yarn.lock', lockContents)
+	if (verbose) console.log('Done')
+}
+
+const showUsage = async () => {
+	process.stderr.write(`
+syntax: prefetch-yarn-deps [path to yarn.lock] [options]
+
+Options:
+  -h --help         Show this help
+  -v --verbose      Verbose output
+  --builder         Only perform the download to current directory, then exit
+`)
+	process.exit(1)
+}
+
+const main = async () => {
+	const args = process.argv.slice(2)
+	let next, lockFile, verbose, isBuilder
+	while (next = args.shift()) {
+		if (next == '--builder') {
+			isBuilder = true
+		} else if (next == '--verbose' || next == '-v') {
+			verbose = true
+		} else if (next == '--help' || next == '-h') {
+			showUsage()
+		} else if (!lockFile) {
+			lockFile = next
+		} else {
+			showUsage()
+		}
+	}
+	let lockContents
+	try {
+		lockContents = await fs.promises.readFile(lockFile || 'yarn.lock', 'utf-8')
+	} catch {
+		showUsage()
+	}
+
+	if (isBuilder) {
+		await prefetchYarnDeps(lockContents, verbose)
+	} else {
+		const { stdout: tmpDir } = await exec('mktemp', [ '-d' ])
+
+		try {
+			process.chdir(tmpDir.trim())
+			await prefetchYarnDeps(lockContents, verbose)
+			const { stdout: hash } = await exec('nix-hash', [ '--type', 'sha256', '--base32', tmpDir.trim() ])
+			console.log(hash)
+		} finally {
+			await exec('rm', [ '-rf', tmpDir.trim() ])
+		}
+	}
+}
+
+main()
+	.catch(e => {
+		console.error(e)
+		process.exit(1)
+	})