'use strict';
var utils = require('../utils'),
watchable = require('./watchable'),
fs = require('fs'),
exec = require('child_process').exec,
checkComplete = false;
module.exports = checkWatchSupport;
/**
* Runs tests to see if the version of `find` being run supports searching by
* seconds using `-mtime -1s -print`. Note that this function **modifies** the
* config being passed in.
*
* @param {Object} config reference to config that's *updated* inside
* @param {Function} ready once the monitor checks are complete, call ready
*/
function checkWatchSupport(config, callback) {
if (checkComplete) {
return callback(config);
}
var ready = function () {
Iif (checkComplete) {
//utils.bus.emit('config:update');
} else {
checkComplete = true;
callback(config);
}
};
var alternativeCheck = function () {
watchable.check(function(success) {
// whether or not fs.watch actually works on this platform, tested and set
// later before starting
config.system.useWatch = success;
ready(config);
});
};
// Note: we're purposely putting Mac over to the `find` command.
// this is because it has a default ulimit of 256 - which is WAY LOW,
// and without asking the user to `unlimit -n <BIG-ASS-NUMBER>` it'll throw
// up all over your screen like this: http://d.pr/i/R6B8+
config.system.useFind = utils.isMac || !fs.watch;
Eif (config.system.useFind) {
exec('find -L /dev/null -type f -mtime -1s -print', function(error) {
Iif (error) {
if (!fs.watch) {
utils.log.error('The version of node you are using combined with the version of find being used does not support watching files. Upgrade to a newer version of node, or install a version of find that supports search by seconds.');
process.exit(1);
} else {
config.system.useFind = false;
alternativeCheck();
}
} else {
// Find is compatible with -1s
ready(config);
}
});
} else {
alternativeCheck();
}
} |