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59 lines
1.7 KiB
59 lines
1.7 KiB
module.exports = uidNumber
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// This module calls into get-uid-gid.js, which sets the
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// uid and gid to the supplied argument, in order to find out their
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// numeric value. This can't be done in the main node process,
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// because otherwise node would be running as that user from this
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// point on.
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var child_process = require("child_process")
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, path = require("path")
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, uidSupport = process.getuid && process.setuid
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, uidCache = {}
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, gidCache = {}
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function uidNumber (uid, gid, cb) {
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if (!uidSupport) return 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 (gid == null) gid = process.getgid()
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if (uid == null) uid = process.getuid()
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if (!isNaN(gid)) gid = gidCache[gid] = +gid
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if (!isNaN(uid)) uid = uidCache[uid] = +uid
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if (uidCache.hasOwnProperty(uid)) uid = uidCache[uid]
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if (gidCache.hasOwnProperty(gid)) gid = gidCache[gid]
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if (typeof gid === "number" && typeof uid === "number") {
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return process.nextTick(cb.bind(null, null, uid, gid))
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}
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var getter = require.resolve("./get-uid-gid.js")
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child_process.execFile( process.execPath
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, [getter, uid, gid]
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, function (code, out, stderr) {
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if (code) {
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var er = new Error("could not get uid/gid\n" + stderr)
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er.code = code
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return cb(er)
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}
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try {
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out = JSON.parse(out+"")
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} catch (ex) {
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return cb(ex)
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}
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if (out.error) {
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var er = new Error(out.error)
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er.errno = out.errno
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return cb(er)
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}
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if (isNaN(out.uid) || isNaN(out.gid)) return cb(new Error(
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"Could not get uid/gid: "+JSON.stringify(out)))
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cb(null, uidCache[uid] = +out.uid, gidCache[gid] = +out.gid)
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})
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}
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