module.exports = exec exec.spawn = spawn var log = require("npmlog") , child_process = require("child_process") , util = require("util") , npm = require("../npm.js") , myUID = process.getuid ? process.getuid() : null , myGID = process.getgid ? process.getgid() : null , isRoot = process.getuid && myUID === 0 , constants = require("constants") , uidNumber = require("uid-number") , once = require("once") function exec (cmd, args, env, takeOver, cwd, uid, gid, cb) { if (typeof cb !== "function") cb = gid, gid = null if (typeof cb !== "function") cb = uid, uid = null if (typeof cb !== "function") cb = cwd, cwd = null if (typeof cb !== "function") cb = takeOver, takeOver = true if (typeof cb !== "function") cb = env, env = process.env gid = gid == null ? myGID : gid uid = uid == null ? myUID : uid if (!isRoot) { if (npm.config.get("unsafe-perm")) { uid = myUID gid = myGID } else if (uid !== myUID || gid !== myGID) { var e = new Error("EPERM: setuid() operation not permitted") e.errno = constants.EPERM return cb(e) } } if (uid !== myUID) { log.verbose("set uid", "from=%s to=%s", myUID, uid) } if (uid && gid && (isNaN(uid) || isNaN(gid))) { // get the numeric values return uidNumber(uid, gid, function (er, uid, gid) { if (er) return cb(er) exec(cmd, args, env, takeOver, cwd, uid, gid, cb) }) } log.silly("exec", cmd+" "+args.map(JSON.stringify).join(" ")) var stdout = "" , stderr = "" , cp = spawn(cmd, args, env, takeOver, cwd, uid, gid) cb = once(cb) cp.on("error", cb) cp.stdout && cp.stdout.on("data", function (chunk) { if (chunk) stdout += chunk }) cp.stderr && cp.stderr.on("data", function (chunk) { if (chunk) stderr += chunk }) cp.on("close", function (code) { var er = null if (code) er = new Error("`"+cmd +(args.length ? " " + args.map(JSON.stringify).join(" ") : "") +"` failed with "+code) cb(er, code, stdout, stderr) }) return cp } function spawn (c, a, env, takeOver, cwd, uid, gid) { var fds = [ 0, 1, 2 ] , opts = { customFds : takeOver ? fds : [-1,-1,-1] , env : env || process.env , cwd : cwd || null } , cp if (uid && !isNaN(uid)) opts.uid = +uid if (gid && !isNaN(gid)) opts.gid = +gid var name = c +" "+ a.map(JSON.stringify).join(" ") log.silly([c, a, opts.cwd], "spawning") cp = child_process.spawn(c, a, opts) cp.name = name return cp }