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module.exports = uidNumber
// This module calls into bin/npm-get-uid-gid.js, which sets the
// uid and gid to the supplied argument, in order to find out their
// numeric value. This can't be done in the main node process,
// because otherwise npm would be running as that user.
var exec = require("./exec.js")
, path = require("path")
, log = require("./log.js")
, constants = require("constants")
, npm = require("../npm.js")
, uidSupport = process.getuid && process.setuid
, uidCache = {}
, gidCache = {}
function uidNumber (uid, gid, cb) {
if (!uidSupport || npm.config.get("unsafe-perm")) return cb()
if (typeof cb !== "function") cb = gid, gid = null
if (typeof cb !== "function") cb = uid, uid = null
if (gid == null) gid = process.getgid()
if (uid == null) uid = process.getuid()
if (!isNaN(gid)) gid = +gid
if (!isNaN(uid)) uid = +uid
if (uidCache[uid]) uid = uidCache[uid]
if (gidCache[gid]) gid = gidCache[gid]
if (typeof gid === "number" && typeof uid === "number") {
return cb(null, uid, gid)
}
var getter = path.join(__dirname, "..", "..", "bin", "npm-get-uid-gid.js")
return exec( process.execPath, [getter, uid, gid], process.env, false
, null, process.getuid(), process.getgid()
, function (er, code, out, err) {
if (er) return log.er(cb, "Could not get uid/gid "+err)(er)
log.silly(out, "output from getuid/gid")
out = JSON.parse(out+"")
if (out.error) {
if (!npm.config.get("unsafe-perm")) {
var er = new Error(out.error)
er.errno = out.errno
return cb(er)
} else {
return cb(null, +process.getuid(), +process.getgid())
}
}
if (isNaN(out.uid) || isNaN(out.gid)) return cb(new Error(
"Could not get uid/gid: "+JSON.stringify(out)))
uidCache[uid] = out.uid
uidCache[gid] = out.gid
cb(null, out.uid, out.gid)
})
}
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