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'use strict' const cp = require('child_process') const path = require('path') const { openSync, closeSync } = require('graceful-fs') const log = require('./log') const execFile = async (...args) => new Promise((resolve) => { const child = cp.execFile(...args, (...a) => resolve(a)) child.stdin.end() }) async function regGetValue (key, value, addOpts) { const outReValue = value.replace(/\W/g, '.') const outRe = new RegExp(`^\\s+${outReValue}\\s+REG_\\w+\\s+(\\S.*)$`, 'im') const reg = path.join(process.env.SystemRoot, 'System32', 'reg.exe') const regArgs = ['query', key, '/v', value].concat(addOpts) log.silly('reg', 'running', reg, regArgs) const [err, stdout, stderr] = await execFile(reg, regArgs, { encoding: 'utf8' }) log.silly('reg', 'reg.exe stdout = %j', stdout) if (err || stderr.trim() !== '') { log.silly('reg', 'reg.exe err = %j', err && (err.stack || err)) log.silly('reg', 'reg.exe stderr = %j', stderr) if (err) { throw err } throw new Error(stderr) } const result = outRe.exec(stdout) if (!result) { log.silly('reg', 'error parsing stdout') throw new Error('Could not parse output of reg.exe') } log.silly('reg', 'found: %j', result[1]) return result[1] } async function regSearchKeys (keys, value, addOpts) { for (const key of keys) { try { return await regGetValue(key, value, addOpts) } catch { continue } } } /** * Returns the first file or directory from an array of candidates that is * readable by the current user, or undefined if none of the candidates are * readable. */ function findAccessibleSync (logprefix, dir, candidates) { for (let next = 0; next < candidates.length; next++) { const candidate = path.resolve(dir, candidates[next]) let fd try { fd = openSync(candidate, 'r') } catch (e) { // this candidate was not found or not readable, do nothing log.silly(logprefix, 'Could not open %s: %s', candidate, e.message) continue } closeSync(fd) log.silly(logprefix, 'Found readable %s', candidate) return candidate } return undefined } module.exports = { execFile, regGetValue, regSearchKeys, findAccessibleSync }