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Daniel Fullmer e6e2a20107 chromium: 93.0.4577.82 -> 94.0.4606.50 2 days ago
.github/workflows Add python-tests to github workflow 2 months ago
LICENSES creating licenses directory 8 months ago
apks chromium: 93.0.4577.82 -> 94.0.4606.50 2 days ago
docs docs: remove outdated language about nested directories 3 weeks ago
flavors lineageos: 2021.08.10.22 -> 2021091803 5 days ago
lib Remove uses of "with lib;" 5 months ago
modules Remove patch for Android 12 5 days ago
nixos nixos/attestation-server: 2021-08-21 -> 2021-09-08 2 weeks ago
pkgs Added new script for unpacking images 1 week ago
scripts fix type errors 2 weeks ago
sdk vanilla: split configurations by androidVersion 2 weeks ago
template Fix documentated usage of keyStorePath 4 months ago
tests source: use "mkdir -p" 4 months ago
.flake8 Add mypy / flake8 checks for python files 2 months ago
.gitignore Add basic test for 2 months ago update for 2021-09-09 2 weeks ago we support Android 11 3 months ago Shellcheck scripts 2 months ago
default.nix apv: add autogenerate script 7 days ago
example.nix Removed flaky Google module 4 months ago
flake.lock flake.lock: Update 3 months ago
flake.nix Add mypy / flake8 checks for python files 2 months ago
mypy.ini Add mypy / flake8 checks for python files 2 months ago
ota.nix Fix documentated usage of keyStorePath 4 months ago
release.nix apv: add autogenerate script 7 days ago
shell.nix Move scripts under scripts dir 2 months ago

robotnix - Build Android (AOSP) using Nix

Robotnix enables a user to easily and reliably build Android (AOSP) images using the Nix package manager / build tool.

Quick Start

Here is a single command to build an img which can be flashed onto a Pixel 3 XL (crosshatch).

$ nix-build "" \
    --arg configuration '{ device="crosshatch"; flavor="vanilla"; }' \
    -A img

The command above will build an image signed with publicly known test-keys, so definitely don't use this for anything intended to be secure. To flash the result to your device, run fastboot update -w <>.


Android projects often contain long and complicated build instructions requiring a variety of tools for fetching source code and executing the build. This applies not only to Android itself, but also to projects included in the Android build, such as the Linux kernel, Chromium webview, MicroG, other external/prebuilt privileged apps, etc. Robotnix orchestrates the diverse build systems across these multiple projects using Nix, inheriting its reliability and reproducibility benefits, and consequently making the build and signing process very simple for an end-user.

Robotnix includes a NixOS-style module system which allows users to easily customize various aspects of the their builds. Some optional modules include:


More detailed robotnix documentation is available at, and should be consulted before use.

Robotnix was presented at Nixcon 2020, and a recording of the talk is available here. Slides for the talk are also available here.


The AOSP project recommends at least 250GB free disk space as well as 16GB RAM. (Certain device kernels which use LTO+CFI may require even more memory) A typical build requires approximately 45GB free disk space to check out the android source, ~14GB for chromium, plus ~100GB of additional free space for intermediate build products. By default, Nix uses /tmp to store these intermediate build products, so ensure your /tmp is not mounted using tmpfs, since the intermediate builds products are very large and will easily use all of your RAM (even if you have 32GB)! A user can use the --cores option for nix-build to set the number of cores to use, which can also be useful to decrease parallelism in case memory usage of certain build steps is too large.

Robotnix also requires support for user namespaces (CONFIG_USER_NS Linux kernel option). Currently, using the "signing inside Nix with a sandbox exception" feature also requires a Nix daemon with the sandbox support enabled. This feature is currently not supported inside Docker for this reason.

A full Android 10 build with Chromium webview takes approximately 10 hours on my quad-core i7-3770 with 16GB of memory. AOSP takes approximately 4 hours of that, while webview takes approximately 6 hours. I have recently upgraded to a 3970x Threadripper with 32-cores. This can build chromium+android in about an hour.


The channel on Matrix is available for a place to chat about the project, ask questions, and discuss robotnix development. You can easily join the channel using the Element web client via this link.

Donating to robotnix

If you find robotnix helpful, please consider donating to the project. Especially consider making a donation if you rely on regular robotnix updates for your personal device. Donations will be used to support ongoing Android updates, developer hardware and build infrastructure, as well as future improvements. Your support is greatly appreciated.

  • My GitHub sponsors page is here.
  • Paypal donations may be made using this link.
  • Bitcoin donations may be directed toward 3GEtqfkPkSSrRFpdcfy4T6YALgTwRyufip.

License information

This project is available as open source under the terms of MIT license. However, for accurate information, please check individual files.