Detoul

Ramon Snir (c) 2015 [MIT License]

A declarative tool for creating integration branches in git

Why?

I found that during development of a version, people wish to test if their code works with other team members' changes. My team members often had issues with the integration branches, merging the integration branches into their feature branches (and then forcing us to start slowly rebasing the feature branches, to take out commits that were meant for a future version but still needed testing).

How?

(further explanation will come in the future, and of course with new features)

Create your release specification branch:

detoul init
detoul create release-february master

Release specifications are placed in the detoul-spec branch and are named by the file name of the specification file. Let's say we have the following content for the committed release-february file in detoul-spec:

checkout master
take Task-1
take Task-3
take-squash Task-4 add dropdowns support
pick 40abfe3

Then we could test that it can be built without conflicts:

$ detoul test release-february
Checking out 'master'...
Taking 'Task-1-improve-buttons'...
Taking 'Task-2-fix-tables'...
Taking 'Task-3-add-dropdowns' (squashed)...
Picking '40abfe3'...
Integration branch succesfully created.

This means the branch is good, and we can then push our changes to detoul-spec to our remote repository and redeploy the release.

To actually make the branch (to test it or to use it), we can run detoul make release-february.

If your deployment procedured isn't configured to make the latest detoul branch, then you can make it and push it in a single command (detoul push release-february) and then deploy the branch release-february.

Installation

git clone https://github.com/ramonsnir/detoul && cd detoul && ./install.sh

There are some packages available that install detoul. More are planned (if you would like to help create packages - feel free to contribute!).

• Arch Linux: https://aur.archlinux.org/packages/detoul/

Requirements

Until detoul has a good test suite, this list should be taken with a grain of salt.

Linux

• a Linux-compatible operating system with a Bourne shell (bash)
• the perl5 interpreter
• git 1.7+ (developed with git 2.2.1, but also tested with a Centos 6.5 machine with git 1.7.1)

Cygwin

A Windows machine with Cygwin bash could use detoul too (note that perl is available as a Cygwin package). The colorized output in Cygwin has less colors (as it supports fewer colors than most terminal emulators), but that shouldn't bother users too much. If it does, then it is probably time for you to find out that Cygwin comes with Mintty (which is a pretty good terminal emulator - much better than the Windows command prompt) and can also work with xterm (which is available as a Cygwin package).

MinGW

Please see the issue ramonsnir#21.

detoul help

detoul: a declarative tool for creating integration branches in git
Usage:
    detoul init
    detoul specs-push
    detoul specs-pull
    detoul create <release> [<base_branch>]
    detoul (test|make) <release>
    detoul add-to <release> <branch> [--squash] [--merge] [--message "<message>"]
    detoul cat (<release>|<archived-release>)
    detoul edit <release> [--amend]
    detoul push <release>
    detoul archive <release>
    detoul unarchive <archived-release>
    detoul help

rebase vs merge

The default take and take-squash actions behave a lot like git-rebase and so will not play nicely with all merge-detection methods (so Github and Bitbucket will not automatically mark relevant pull requests as merged).

If you don't like this behavior, you can instead use take-merge (or detoul add-to <release> <branch> --merge) which will keep the source branch an ancestor of the target branch.

Using git-rerere with detoul

Clearly unless all your feature branches are always completely disjoint, then you will often have merge conflicts between branches. detoul employs git-rerere to reuse recorded resolutions of conflicts. If you try to detoul make a release and detoul encounters a conflict, it will exit with a failure but will allow you to manually resolve the merge conflict. If you configured your git to use git-rerere (by calling git config rerere.enabled true), then it will automatically record your conflict resolution. The next time you run detoul make for the release, detoul will take your recorded resolutions and use them to resolve the encountered conflict. detoul will then save the rr-cache (recorded resolutions cache) inside the detoul-spec branch so that everyone that wishes to build the release could reuse your recorded resolutions automatically.

Note that while your resolutions will not be recorded without enabled git-rerere, detoul will automatically use recorded resolutions even without enabling git-rerere enabled in your local repository (of course, assuming someone recorded the conflict resolution before).

Auto-completion gone wrong

After a couple of dozen releases, the release name auto-completion starts to be less useful, as there are too many irrelevant releases. If it bothers you, you can "archive" old releases using detoul archive. Archived releases won't be suggested by the auto-completion, and will not be built by mistake. They can still be browsed using detoul cat (which will also continue to auto-complete on them), and can be revived at any time using detoul unarchive.

Why in bash?

I wrote this on my own time, and wanted to have fun. It shouldn't take more than an hour to translate detoul into any other language, once I choose to which one.