Gulp git version, fetches the latest git commit hash. Can be used as version for your application. Inject/replace it in your html

gulpfile-git-version.js

'use strict';

var gulp = require('gulp');
var spawn = require('child_process').spawn;

var GIT_VERSION = "na";

gulp.task('version', function(cb){
    //git --git-dir=.git log --pretty='%ct %h' -1
    //git --git-dir=.git log --pretty='%h' -1

    var child = spawn("git", ["--git-dir=.git", "log", "--pretty=%h", "-1"], {cwd: process.cwd()}),
        stdout = '',
        stderr = '';

    child.stdout.setEncoding('utf8');
    child.stdout.on('data', function (data) {
        stdout += data;
    });

    child.stderr.setEncoding('utf8');
    child.stderr.on('data', function (data) {
        stderr += data;
    });

    child.on('close', function(code) {
        var normalized = stdout.replace(/(?:\r\n|\r|\n)/g, "")
        console.log("Version: " + normalized);
        GIT_VERSION = normalized;
        cb();
    });
});

Added the callback (cb) and called it on close. Otherwise the task ordering may be wrong, and a task requiring this could have the GIT_VERSION not defined.