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c223bfe5d5
Closes #455 Closes #453 Fixes #419 This method creates a file and checks the stat to check of an offset between the date on the machine and the created time on the file system. Docker (in my tests) show that you can get the offset using this method. Once we have the offset, we tell the user (once) and then we use that to find files that have been modified according to the offset (either looking in the last using -mmin or in the future using -newer + a touched file).
68 lines
2.3 KiB
JavaScript
68 lines
2.3 KiB
JavaScript
'use strict';
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var utils = require('../utils'),
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watchable = require('./watchable'),
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fs = require('fs'),
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exec = require('child_process').exec,
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checkComplete = false;
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module.exports = checkWatchSupport;
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/**
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* Runs tests to see if the version of `find` being run supports searching by
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* seconds using `-mtime -1s -print`. Note that this function **modifies** the
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* config being passed in.
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*
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* @param {Object} config reference to config that's *updated* inside
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* @param {Function} ready once the monitor checks are complete, call ready
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*/
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function checkWatchSupport(config, callback) {
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if (checkComplete) {
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return callback(config);
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}
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var ready = function () {
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if (checkComplete) {
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//utils.bus.emit('config:update');
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} else {
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checkComplete = true;
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callback(config);
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}
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};
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var alternativeCheck = function () {
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watchable.check(function(success) {
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// whether or not fs.watch actually works on this platform, tested and set
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// later before starting
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config.system.useWatch = success;
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ready(config);
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});
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};
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// Note: we're purposely putting Mac over to the `find` command.
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// this is because it has a default ulimit of 256 - which is WAY LOW,
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// and without asking the user to `unlimit -n <BIG-ASS-NUMBER>` it'll throw
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// up all over your screen like this: http://d.pr/i/R6B8+
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// even with higher ulimit -n Mac has another problem: https://github.com/joyent/node/issues/5463
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// This will be fixed in 0.12, before then we default to find
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config.system.useFind = utils.isMac || utils.isLinux || !fs.watch;
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var mtime = utils.isMac ? '-mtime -1s' : '-mmin -0.01';
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if (config.system.useFind) {
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exec('find -L /dev/null -type f ' + mtime + ' -print', function(error) {
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if (error) {
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if (!fs.watch) {
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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.');
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process.exit(1);
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} else {
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config.system.useFind = false;
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alternativeCheck();
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}
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} else {
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// Find is compatible with -1s
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ready(config);
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}
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});
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} else {
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alternativeCheck();
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}
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}
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