How do you get a git log output from a shelljs.exec command?

Question

I need to put a git log into a file. The command line works fine

But if I call this command with a grunt task using shelljs.exec, I dont get any output

Git log with grunt task using shelljs.exec

Here the grunt code :

/*global module:false,require,console*/
'use strict';

var shell = require('shelljs');


module.exports = function (grunt) {

    // Project configuration.
    grunt.initConfig({
        // Task configuration.
    });

    grunt.task.registerTask('git-log', 'git log output', function () {
        console.log('RESULT : ', shell.exec('git log HEAD...HEAD^ --oneline',{silent : true}).output);
    });

    // Default task.
    grunt.registerTask('default', ['git-log']);

};

I checked all the shelljs docs and tried different ways (including async) with no success...

Any idea ? Thx

Could you try this and post the result ? grunt.log.writeln( JSON.stringify( shell.exec('git log HEAD...HEAD^ --oneline', {silent : true}), null, 2 ) ); — Eria
– Eria, Commented Jan 28, 2016 at 13:30
Running "git-log" task {"code": 0, "output": "" } Done, without errors. Process finished with exit code 0 — user3793538
– user3793538, Commented Jan 28, 2016 at 14:05
It seems there is not output when the command succeeds (code = 0). I'm going to check something then I'll get back to you. — Eria
– Eria, Commented Jan 28, 2016 at 14:08
Do you have to use shelljs absolutely ? Because this module github.com/juliangruber/git-log may be a solution. — Eria
– Eria, Commented Jan 28, 2016 at 14:14
Yes, I need to append the log result into a file (Im using file-creator task) with another input — user3793538
– user3793538, Commented Jan 28, 2016 at 14:33

oakymax · Accepted Answer · 2016-06-17 13:01:50Z

1

Try to use .stdout instead of .output.

In your code:

shell.exec(
  'git log HEAD...HEAD^ --oneline',
  {silent : true}
).output;

Change to:

shell.exec(
  'git log HEAD...HEAD^ --oneline',
  {silent : true}
).stdout;

answered Jun 17, 2016 at 13:01

oakymax

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