1module.exports = isexe 2isexe.sync = sync 3 4var fs = require('fs') 5 6function isexe (path, options, cb) { 7 fs.stat(path, function (er, stat) { 8 cb(er, er ? false : checkStat(stat, options)) 9 }) 10} 11 12function sync (path, options) { 13 return checkStat(fs.statSync(path), options) 14} 15 16function checkStat (stat, options) { 17 return stat.isFile() && checkMode(stat, options) 18} 19 20function checkMode (stat, options) { 21 var mod = stat.mode 22 var uid = stat.uid 23 var gid = stat.gid 24 25 var myUid = options.uid !== undefined ? 26 options.uid : process.getuid && process.getuid() 27 var myGid = options.gid !== undefined ? 28 options.gid : process.getgid && process.getgid() 29 30 var u = parseInt('100', 8) 31 var g = parseInt('010', 8) 32 var o = parseInt('001', 8) 33 var ug = u | g 34 35 var ret = (mod & o) || 36 (mod & g) && gid === myGid || 37 (mod & u) && uid === myUid || 38 (mod & ug) && myUid === 0 39 40 return ret 41} 42