The tools used in the development of Life Is Strange

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1 The tools used in the development of Life Is Strange Sam Hocevar Lead Engine Programmer, Dontnod Entertainment Digital Dragons May 2016 Kraków, Poland

2 Dontnod Entertainment based in Paris, France Remember Me (2013) Life Is Strange (2015) Vampyr (TBA)

3 Two words about me not a game developer initially worked on VLC worked on Debian lots of sysadmin & Unix experience unfamiliar with some industry practices

4 1. Challenges

5 1. Challenges An unusual project for us no experience with episodic releases no experience with PC games need to build and package for 5 platforms and 3 regions 5 episodes + box version + Japanese version 7 releases + combinations of patches & updates

6 1. Challenges A small team on a budget small independent company only a handful of full-time programmers no data manager, no system administrator no extra hardware to be expected the Vampyr team needed the computing resources, too

7 1. Challenges The strategy make code iterations short try to automate tasks reuse old hardware use free / opensource software do not develop new tools except sometimes

8 2. Nimp

9 2. Nimp Our CLI swiss army knife n imp is French slang for whatever command-line tool, written in Python started as just a shortcut for common tasks: nimp build, nimp publish, cook, package written for Windows; worked on Linux, Mac with no effort

10 2. Nimp Rationale (1) #1 reason: Visual Studio

11 2. Nimp Rationale (2) #2 reason: Visual Studio

12 2. Nimp Rationale (3) build tools & packaging tools are very diverse across platforms, we wanted a unified syntax, and keep it when switching to UE4 we get exhaustive logs (stdout, stderr, OutputDebugString) task automation becomes trivial a lot of people can hack some Python

13 2. Nimp Configuration (1) each game project has a.nimp.conf file syntax is Python:

14 2. Nimp Configuration (2) override environment variables on a per-project basis: (handling multiple SDK versions on the same system is often a nightmare)

15 2. Nimp Configuration (3) execute Python code from the configuration file: one could check for installed software, for the number of CPUs, for available disk space, for running processes

16 2. Nimp A few notes Nimp is less than 4000 lines of code tries to adapt to the project s build system, instead of modifying the project s build system our whole compilation farm system relies on it code quality is not extraordinary for now, but we re considering putting it on GitHub

17 3. Buildbot

18 3. Buildbot Introduction master/slave continuous integration system opensource, first released in 2003 written in Python, runs on Windows, Linux, Mac used by Mozilla, Chrome, VLC, MongoDB hundreds of users used at Dontnod since 2014, replacing Epic s CIS

19 3. Buildbot Features (1) configuration is in Python (we like that!) web interface interface instant messaging interface (IRC)

20 3. Buildbot Features (2) priorities (project A must be built before project B) triggers (run nightly checks if compilation succeeded) launch build for a given changelist retry builds, cancel builds, emergency cancel builds see logs in real time (before build is finished)

21 3. Buildbot

22 3. Buildbot

23 3. Buildbot

24 3. Buildbot Buildbot and Nimp most of our Buildbot steps are Nimp commands

25 3. Buildbot Troubleshooting read the logs try to understand issue if necessary, re-run the nimp command manually

26 3. Buildbot Datamining build logs are stored on the buildbot server we do some datamining: compilation warnings, engine warnings, build times nimp can timestamp each log line for precise timings

27 3. Buildbot It made sense we were really dissatisfied with proprietary CISs the burden of maintenance is not on us (though we do report bugs) has plugins developed by the community got a problem? We just use Google and get access to 13 years worth of Buildbot experience

28 4. Farm agents

29 4. Farm agents Farm agent roles compile game and editor binaries run unit tests, data checks build lightmaps, light probes, streaming data cook/bake game data create game packages, patches, DLCs

30 4. Farm agents Constraints must use refurbished hardware runs a buildbot slave jobs should run on any agent interchangeably all software (SDK, middlewares) should be up to date daily maintenance should be easy

31 4. Farm agents Install software: Windows

32 4. Farm agents Install software: Unix

33 4. Farm agents MSYS2 like Cygwin, with a package manager (pacman) provides a Unix-like environment for Windows has grep, sed, bash, zsh, diff/patch, git, vim, ssh, python, gcc, you name it supports private package repositories for your in-house tools!

34 4. Farm agents Maintenance example (1) task: remove all PCH files in Intermediate directories on all projects because the toolchain changed I have no idea how to do this without the command-line in a Unix shell:

35 4. Farm agents Maintenance example (2) do it remotely

36 4. Farm agents Maintenance example (3) do it on all farm agents any developer is able to copy-paste this example

37 4. Farm agents Maintenance tools ssh server for anything CLI some software upgrades, kill processes, clean up hard disk also file transfers VNC for anything GUI accepts simultaneous connections can be used for screenshots/timelapses

38 4. Farm agents Farm deployment each farm agent also has a Linux system reboot two agents under Linux, we can make an exact copy of the Windows system with everything set up install Linux in less than 1 hour install Windows + 4 versions of Visual Studio + SDKs for 4 console platforms + middlewares + setup in 1 hour

39 4. Farm agents Under the hood disks are synchronised using rsync understands NTFS pretty well (no Windows 10 yet ) tweak registry after sync update desktop backgrond

40 4. Farm agents

41 4. Farm agents Advantages upgrade all machines in log(n) time! each machine serves as a backup of the others made a mistake? wanna try something? hard drive died? just copy from another agent

42 4. Farm agents VMs looked cool but didn t work we tried to run Windows guests on Linux allowed to deploy/replicate without rebooting very low level remote maintenance better monitoring of disk & CPU usage but compilation performance was very poor

43 5. Patoune

44 5. Patoune Binaries deployment artists need our features as soon as possible they need to know when new binaries are ready they may need to go back to a previous version data and binaries can t be easily stored together in source control (synchronisation issues)

45 5. Patoune multi-purpose desktop app small C# codebase monitors buildbot, Perforce, remote builds, local builds keeps last N binary packages on disk for fast deployment get data at revision X, binaries at revision Y revert to any previous version

46 5. Patoune Bittorrent is great! fastest protocol we know for mass deployment available for Python (bittornado) nimp available for C# (MonoTorrent) Patoune lots of existing tools to create torrents use zip! fast, compresses binaries 1:4, bypasses antivirus

47 6. Conclusion

48 6. Conclusion Lessons learned opensource can be great and benefits everyone easy maintenance should be a key criterion people leave people forget how stuff works integrating existing bricks is a time saver industry-standard is not limited to the game industry!

49 6. Conclusion Future experiments Use Weblate for translations Use Fastbuild for distributed & cached compilations on Windows Allow Linux agents to compile for Windows when available Try experimental support for Windows 10 s NTFS extensions Try Windows 10 s new Ubuntu integration

50 6. Conclusion Thanks! any questions?

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