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var fs = require('fs')
/**
* Provides symlink loop detection to directory traversal algorithm.
*/
module.exports = {
detectLoop: function (entry, symlinkCache) {
if (entry && entry.isSymlink) {
var realPath = fs.realpathSync(entry.absolutePath)
if (symlinkCache[realPath]) {
return true
}
}
return false
},
initSymlinkCache: function() {
return {
dir1: {},
dir2: {}
}
},
updateSymlinkCache: function(symlinkCache, rootEntry1, rootEntry2, loopDetected1, loopDetected2) {
var symlinkCachePath1, symlinkCachePath2
if (rootEntry1 && !loopDetected1) {
symlinkCachePath1 = rootEntry1.isSymlink ? fs.realpathSync(rootEntry1.absolutePath) : rootEntry1.absolutePath
symlinkCache.dir1[symlinkCachePath1] = true
}
if (rootEntry2 && !loopDetected2) {
symlinkCachePath2 = rootEntry2.isSymlink ? fs.realpathSync(rootEntry2.absolutePath) : rootEntry2.absolutePath
symlinkCache.dir2[symlinkCachePath2] = true
}
},
cloneSymlinkCache: function (symlinkCache) {
return {
dir1: shallowClone(symlinkCache.dir1),
dir2: shallowClone(symlinkCache.dir2)
}
},
}
function shallowClone(obj) {
var cloned = {}
Object.keys(obj).forEach(function (key) {
cloned[key] = obj[key]
})
return cloned
}
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