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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
}