Building LineageOS on NixOS

shell.nix

# I used this shell.nix to build LineageOS 13.0 for my maguro (Samsung Galaxy Nexus GSM) phone
# The build instructions for normal Linuxes are here: https://wiki.lineageos.org/devices/maguro/build
# For NixOS, follow those instructions but skip anything related to installing packages
# Detailed instructions:
#   cd into an empty directory of your choice
#   copy this file there
#   in nix-shell:
#    $ repo init -u https://github.com/LineageOS/android.git -b cm-13.0
#    $ repo sync
#    $ source build/envsetup.sh
#    $ breakfast maguro
#    Get proprietary blobs (see https://wiki.lineageos.org/devices/maguro/build#extract-proprietary-blobs)
#     (I actually used blobs from https://github.com/TheMuppets, following https://forum.xda-developers.com/showpost.php?s=a6ee98b07b1b0a2f4004b902a65d9dcd&p=76981184&postcount=4)
#    $ ccache -M 50G (see https://wiki.lineageos.org/devices/maguro/build#turn-on-caching-to-speed-up-build)
#    $ croot
#    $ brunch maguro
#    $ cd $OUT
#   The built ROM is named something like lineage-13.0-20180730-UNOFFICIAL-maguro.zip
#   You can flash it onto your device as usual, see e.g. https://wiki.lineageos.org/devices/maguro/install for maguro
#   Voilà ! It Just Works™ (at least it did for me)

# Warning: the hardened NixOS kernel disables 32 bit emulation, which made me run into multiple "Exec format error" errors.
# To fix, use the default kernel, or enable "IA32_EMULATION y" in the kernel config.



let
  # nixpkgs-unstable does not have jdk7 anymore. I used the nixos-18.03 channel
  pkgs = import <nixpkgs> {};

  # Inspired from https://nixos.wiki/wiki/Android#Building_Android_on_NixOS
  # I had to add several packages to make it work for me
  fhs = pkgs.buildFHSUserEnv {
    name = "android-env";
    targetPkgs = pkgs: with pkgs; [
      androidenv.platformTools
      bc
      binutils
      bison
      ccache
      curl
      flex
      gcc
      git
      gitRepo
      gnumake
      gnupg
      gperf
      imagemagick
      jdk7
      libxml2
      lz4
      lzop
      m4
      maven # Needed for LineageOS 13.0
      nettools
      openssl
      perl
      pngcrush
      procps
      python2
      rsync
      schedtool
      SDL
      squashfsTools
      unzip
      utillinux
      wxGTK30
      xml2
      zip
    ];
    multiPkgs = pkgs: with pkgs; [
      zlib
      ncurses5
      libcxx
      readline
    ];
    runScript = "bash";
    profile = ''
      export USE_CCACHE=1
      export ANDROID_JAVA_HOME=${pkgs.jdk7.home}
      # Building involves a phase of unzipping large files into a temporary directory
      export TMPDIR=/tmp
    '';
  };

in pkgs.stdenv.mkDerivation {
  name = "android-env-shell";
  nativeBuildInputs = [ fhs ];
  shellHook = "exec android-env";
}

kinda forgot about this tbh but i just remembered to fork your gist with my changes for LineageOS 21 on redfin. leaving this comment here for anyone who finds this gist so they hopefully don't have to duplicate my efforts. Link here: https://gist.github.com/Arian04/bea169c987d46a7f51c63a68bc117472

to anyone reading (idk if it ever will) but if that link ever doesn't work then just check my profile's gists.

Tyvm!