Try Fuzzy: A Try Syntax Alternative

It’s no secret that I’m not a fan of try syntax, it’s a topic I’ve blogged about on several occasions before. Today, I’m pleased to announce that there’s a real alternative now landed on mozilla-central. It works on all platforms with mercurial and git. For those who just like to dive in:

$ mach mercurial-setup --update  # only if using hg
$ mach try fuzzy

This will prompt you to install fzf. After bootstrapping is finished, you’ll enter an interface populated with a list of all possible taskcluster tasks. Start typing and the list will be filtered down using a fuzzy matching algorithm. I won’t go into details on how to use this tool in this blog post, for that see:

$ mach try fuzzy --help  # or
$ man fzf

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Absorbing Changes into a Commit Series with Mercurial

Imagine this scenario. You’ve pushed a large series of commits to your favourite review tool (because you are a believer in the glory of microcommits). The reviewer however has found several problems, and worse, they are spread across all of the commits in your series. How do you fix all the issues with minimal fuss while preserving the commit order?

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A Course of Action for Replacing Try Syntax

I’ve previously blogged about why I believe try syntax is an antiquated development process that should be replaced with something more modern and flexible. What follows is a series of ideas that I’m trying to convert into a concrete plan of action to bring this about. This is not an Intent to Implement or anything like that, but my hope is that this outline is detailed enough that it could be used as a solid starting point by someone with enough time and motivation to work on it.

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Using One Click Loaner to Debug Failures

One of the most painful aspects of a developer’s work cycle is trying to fix failures that show up on try, but which can’t be reproduced locally. When this happens, there were really only two options (neither of them nice):

  1. You could spam try with print debugging. But this isn’t very powerful, and takes forever to get feedback.
  2. You could request a loaner from releng. But this is a heavy handed process, and once you have the loaner it is very hard to get tests up and running.

I’m pleased to announce there is now a third option, which is easy, powerful and 100% self-serve. Rather than trying to explain it in words, here is a ~5 minute demo:

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The Zen of Mach

Mach is the Mozilla developer’s swiss army knife. It gathers all the important commands you’ll ever need to run, and puts them in one convenient place. Instead of hunting down documentation, or asking for help on irc, often a simple |mach help| is all that’s needed to get you started. Mach is great. But lately, mach is becoming more like the Mozilla developer’s toolbox. It still has everything you need but it weighs a ton, and it takes a good deal of rummaging around to find anything.

Frankly, a good deal of the mach commands that exist now are either poorly written, confusing to use, or even have no business being mach commands in the first place. Why is this important? What’s wrong with having a toolbox?

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Looking beyond Try Syntax

Today marks the 5 year anniversary of try syntax. For the uninitiated, try syntax is a string that you put into your commit message which a parser then uses to determine the set of builds and tests to run on your try push. A common try syntax might look like this:

try: -b o -p linux -u mochitest -t none

Since inception, it has been a core part of the Mozilla development workflow. For many years it has served us well, and even today it serves us passably. But it is almost time for try syntax to don the wooden overcoat, and this post will explain why.

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Making mercurial bookmarks more git-like

I mentioned in my previous post a mercurial extension I wrote for making bookmarks easier to manipulate. Since then it has undergone a large overhaul, and I believe it is now stable and intuitive enough to advertise a bit more widely.

Introducing bookbinder

When working with bookmarks (or anonymous heads) I often wanted to operate on the entire series of commits within the feature I was working on. I often found myself digging out revision numbers to find the first commit in a bookmark to do things like rebasing, grafting or diffing. This was annoying. I wanted bookmarks to work more like a git-style branch, that has a definite start as well as an end. And I wanted to be able to easily refer to the set of commits contained within. Enter bookbinder.

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How to Consume Structured Test Results

You may not know that most of our test harnesses are now outputting structured logs (thanks in large part to :chmanchester’s tireless work). Saying a log is structured simply means that it is in a machine readable format, in our case each log line is a JSON object. When streamed to a terminal or treeherder log, these JSON objects are first formatted into something that is human readable, aka the same log format you’re already familiar with (which is why you may not have noticed this).

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The New Mercurial Workflow

There’s a good chance you’ve heard something about a new review tool coming to Mozilla and how it will change everything. There’s an even better chance you’ve stumbled across one of gps’ blog posts on how we use mercurial at Mozilla.

With mozreview entering beta, I decided to throw out my old mq based workflow and try to use all the latest and greatest tools. That means mercurial bookmarks, a unified mozilla-central, using mozreview and completely expunging mq from my workflow.

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