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