From 21adc7b24b4f936a57d878d86585018de4ae72b1 Mon Sep 17 00:00:00 2001
From: Waldemar Tomme <waldetomme@gmail.com>
Date: Tue, 7 Jan 2025 20:24:14 +0100
Subject: [PATCH] Add android build environment

---
 dev/NOTES.md    |  7 ++++
 dev/default.nix | 86 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+)

diff --git a/dev/NOTES.md b/dev/NOTES.md
index 55a8962..8a254d4 100644
--- a/dev/NOTES.md
+++ b/dev/NOTES.md
@@ -11,6 +11,13 @@ samsung-a715f:~$ cat /proc/interrupts | grep -i i2c
 
 samsung-a715f:~$ cat /proc/interrupts | grep -i dma
 133:       1061          0          0          0          0          0          0          0     GICv3 311 Level     gpi-dma
+
+samsung-a715f:~# cat /sys/kernel/debug/dmaengine/summary
+dma0 (800000.dma-controller): number of channels: 8
+
+dma1 (a00000.dma-controller): number of channels: 8
+ dma1chan0    | a84000.i2c:tx
+ dma1chan1    | a84000.i2c:rx
 ```
 
 ### Android
diff --git a/dev/default.nix b/dev/default.nix
index 844aa5f..b8e5398 100644
--- a/dev/default.nix
+++ b/dev/default.nix
@@ -27,12 +27,97 @@
           '';
         # rootDir = builtins.toString ./..;
         rootDir = "."; # Assume PWD as root for now
+
+        android-toolchain = pkgs.fetchGit {
+          url = "";
+          rev = "main";
+        };
+        android-fhs = pkgs.buildFHSUserEnv {
+          name = "android-env";
+          targetPkgs = pkgs: with pkgs; [
+            android-tools
+            libxcrypt-legacy # libcrypt.so.1
+            freetype # libfreetype.so.6
+            fontconfig # java NPE: "sun.awt.FontConfiguration.head" is null
+            yaml-cpp # necessary for some kernels according to a comment on the gist
+
+            # Some of the packages here are probably unecessary but I don't wanna figure out which
+            bc
+            binutils
+            bison
+            ccache
+            curl
+            flex
+            gcc
+            git
+            git-repo
+            git-lfs
+            gnumake
+            gnupg
+            gperf
+            imagemagick
+            jdk11
+            elfutils
+            libxml2
+            libxslt
+            lz4
+            lzop
+            m4
+            nettools
+            openssl.dev
+            perl
+            pngcrush
+            procps
+            python3
+            rsync
+            schedtool
+            SDL
+            squashfsTools
+            unzip
+            util-linux
+            xml2
+            zip
+
+            # only necessary if you wanna use `runScript = "zsh";` below
+            zsh
+          ];
+          multiPkgs = pkgs: with pkgs; [
+            zlib
+            ncurses5
+            libcxx
+            readline
+
+            libgcc # crtbeginS.o
+            iconv # ??? - i put this here and by the time i went back to remove unecessary packages i forgot why
+            iconv.dev # sys/types.h
+          ];
+          runScript = "bash";
+          profile = ''
+            export ALLOW_NINJA_ENV=true
+            export USE_CCACHE=1
+            export CCACHE_EXEC=/usr/bin/ccache
+            export ANDROID_JAVA_HOME=${pkgs.jdk11.home}
+            # Building involves a phase of unzipping large files into a temporary directory
+            export TMPDIR=/tmp
+            export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${pkgs.ncurses5}/lib
+          '';
+        };
+        # android-fhs-shell = pkgs.stdenv.mkDerivation {
+        #   name = "android-env-shell";
+        #   nativeBuildInputs = [
+        #     android-fhs
+        #   ];
+        #   shellHook = "exec android-env";
+        #   dontUnpack = true;
+        # };
       in
       pkgs.mkShell {
         packages = with pkgs; [
           (python3.withPackages (pypi: with pypi; [
             libfdt
           ]))
+          android-fhs
+
           (writeShellScriptBin "flash-lineage-magisk" ''
             rootDir="${rootDir}"
             lineageBootImg="$rootDir/.cache/lineageos-magisk-boot.img"
@@ -81,6 +166,7 @@
             rootDir="${rootDir}"
             mkdir -p "$rootDir/.repos"
             [[ -d "$rootDir/.repos/mainline-kernel" ]] || git clone git@github.com:WiiPlayer2/linux-sm7150.git "$rootDir/.repos/mainline-kernel"
+            # [[ -d "$rootDir/.repos/android-kernel" ]] || git clone ssh://git@git.web.home.dark-link.info:2222/a71-pmos/android-kernel-a71.git "$rootDir/.repos/android-kernel"
           '')
           (writeScriptBin "build-and-flash-kernel" ''
             #!/usr/bin/env bash