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const { spawn } = require('child_process')
const inferOwner = require('infer-owner')
const isPipe = (stdio = 'pipe', fd) =>
stdio === 'pipe' || stdio === null ? true
: Array.isArray(stdio) ? isPipe(stdio[fd], fd)
: false
// 'extra' object is for decorating the error a bit more
const promiseSpawn = (cmd, args, opts = {}, extra = {}) => {
const cwd = opts.cwd || process.cwd()
const isRoot = process.getuid && process.getuid() === 0
const { uid, gid } = isRoot ? inferOwner.sync(cwd) : {}
return promiseSpawnUid(cmd, args, {
...opts,
cwd,
uid,
gid,
}, extra)
}
const stdioResult = (stdout, stderr, { stdioString, stdio }) =>
stdioString ? {
stdout: isPipe(stdio, 1) ? Buffer.concat(stdout).toString() : null,
stderr: isPipe(stdio, 2) ? Buffer.concat(stderr).toString() : null,
}
: {
stdout: isPipe(stdio, 1) ? Buffer.concat(stdout) : null,
stderr: isPipe(stdio, 2) ? Buffer.concat(stderr) : null,
}
const promiseSpawnUid = (cmd, args, opts, extra) => {
let proc
const p = new Promise((res, rej) => {
proc = spawn(cmd, args, opts)
const stdout = []
const stderr = []
const reject = er => rej(Object.assign(er, {
cmd,
args,
...stdioResult(stdout, stderr, opts),
...extra,
}))
proc.on('error', reject)
if (proc.stdout) {
proc.stdout.on('data', c => stdout.push(c)).on('error', reject)
proc.stdout.on('error', er => reject(er))
}
if (proc.stderr) {
proc.stderr.on('data', c => stderr.push(c)).on('error', reject)
proc.stderr.on('error', er => reject(er))
}
proc.on('close', (code, signal) => {
const result = {
cmd,
args,
code,
signal,
...stdioResult(stdout, stderr, opts),
...extra,
}
if (code || signal) {
rej(Object.assign(new Error('command failed'), result))
} else {
res(result)
}
})
})
p.stdin = proc.stdin
p.process = proc
return p
}
module.exports = promiseSpawn
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