81 lines
2.2 KiB
JavaScript
Executable file
81 lines
2.2 KiB
JavaScript
Executable file
'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
|
|
}
|