michael@0: const Ci = Components.interfaces;
michael@0: const Cc = Components.classes;
michael@0: const NS_OS_TEMP_DIR = "TmpD";
michael@0: 
michael@0: const CWD = do_get_cwd();
michael@0: function checkOS(os) {
michael@0:   const nsILocalFile_ = "nsILocalFile" + os;
michael@0:   return nsILocalFile_ in Components.interfaces &&
michael@0:          CWD instanceof Components.interfaces[nsILocalFile_];
michael@0: }
michael@0: 
michael@0: const isWin = checkOS("Win");
michael@0: const isMac = checkOS("Mac");
michael@0: const isUnix = !(isWin || isMac);
michael@0: 
michael@0: var hiddenUnixFile;
michael@0: function createUNIXHiddenFile() {
michael@0:   var dirSvc = Cc["@mozilla.org/file/directory_service;1"].getService(Ci.nsIProperties);
michael@0:   var tmpDir = dirSvc.get(NS_OS_TEMP_DIR, Ci.nsIFile);
michael@0:   hiddenUnixFile = tmpDir.clone();
michael@0:   hiddenUnixFile.append(".foo");
michael@0:   // we don't care if this already exists because we don't care
michael@0:   // about the file's contents (just the name)
michael@0:   if (!hiddenUnixFile.exists())
michael@0:     hiddenUnixFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
michael@0:   return hiddenUnixFile.exists();
michael@0: }
michael@0: 
michael@0: function run_test() {
michael@0:   // Skip this test on Windows
michael@0:   if (isWin)
michael@0:     return;
michael@0: 
michael@0:   do_check_true(createUNIXHiddenFile());
michael@0:   do_check_true(hiddenUnixFile.isHidden());
michael@0: }
michael@0: