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