Got armv6l compiling, but it's not yet tested

default.nix

@@ -20,19 +20,19 @@
 
 in rec {
 
-  version = let
-    revisionFile = if builtins.isNull revision
-      then pkgsNative.stdenv.mkDerivation {
-        name = "revision.txt";
-        nativeBuildInputs = [ pkgsNative.git ];
-        src = ./.git;
-        phases = [ "installPhase" ];
-        installPhase = ''
-          git -c safe.directory='*' -C $src describe --tags > $out
-        '';
-      }
-      else pkgsNative.writeText "revision.txt" revision;
-  in pkgs.stdenv.mkDerivation {
+  revisionFile = if builtins.isNull revision
+    then pkgsNative.stdenv.mkDerivation {
+      name = "revision.txt";
+      nativeBuildInputs = [ pkgsNative.git ];
+      src = ./.git;
+      phases = [ "installPhase" ];
+      installPhase = ''
+        git -c safe.directory='*' -C $src describe --tags > $out
+      '';
+    }
+    else pkgsNative.writeText "revision.txt" revision;
+
+  version = pkgs.stdenv.mkDerivation {
     name = "isle-version";
 
     inherit buildSystem hostSystem revisionFile releaseName;
@@ -88,11 +88,8 @@ in rec {
 
   nebula = pkgs.callPackage ./nix/nebula.nix {};
 
-  garage = let
-    hostPlatform = pkgs.stdenv.hostPlatform.parsed;
-  in garageNix.package {
-    inherit pkgsNix buildSystem;
-    hostSystem = "${hostPlatform.cpu.name}-unknown-${hostPlatform.kernel.name}-musl";
+  garage = garageNix.package {
+    inherit pkgsNix buildSystem hostSystem;
   };
 
   appDirBase = pkgs.buildEnv {
@@ -143,30 +140,26 @@ in rec {
     ];
   };
 
+  appimagekit = pkgsNative.callPackage ./nix/appimagetool {
+    inherit hostSystem;
+  };
+
   build = rec {
     appImage = pkgs.stdenv.mkDerivation {
       name = "isle-AppImage";
       src = appDir;
+      inherit revisionFile;
 
-      nativeBuildInputs = [
-        (pkgsNative.callPackage ./nix/appimagetool.nix {})
-      ];
-
-      ARCH = pkgs.stdenv.hostPlatform.parsed.cpu.name;
+      nativeBuildInputs = [ appimagekit ];
 
       builder = builtins.toFile "build.sh" ''
         source $stdenv/setup
         cp -rL "$src" isle.AppDir
         chmod +w isle.AppDir -R
 
-        export VERSION=debug
-
-        # https://github.com/probonopd/go-appimage/issues/155
-        unset SOURCE_DATE_EPOCH
-
-        appimagetool ./isle.AppDir
+        export VERSION=$(cat $revisionFile)
         mkdir -p "$out"/bin
-        mv Isle-* "$out"/bin/isle
+        appimagetool ./isle.AppDir "$out"/bin/isle
       '';
     };
 

docs/install.md

@@ -9,6 +9,7 @@ supported:
 - `x86_64` (aka `amd64`)
 - `aarch64` (aka `arm64`)
 - `i686`
+- `armv6l` (For older Raspberry Pis)
 
 (`i686` has not been tested.)
 

nix/appimagetool.nix

@@ -1,40 +0,0 @@
-{ stdenv, fetchurl }:
-
-let
-
-  version = "765";
-
-  cpuArch = stdenv.buildPlatform.parsed.cpu.name;
-
-  srcDir = ./go-appimage;
-
-  # https://github.com/probonopd/go-appimage
-  # The author of go-appimage has set up some crazy continuous integration build
-  # system with github, which is really cool, except that it doesn't preserve
-  # any older builds of the project. And it's pretty difficult to build it
-  # ourselves. So fuck it, just embed the build artifacts directly in this
-  # project.
-  src = {
-    "x86_64" = "${srcDir}/appimagetool-${version}-x86_64.AppImage";
-    "aarch64" = "${srcDir}/go-appimage/appimagetool-${version}-aarch64.AppImage";
-    "armv7l" = "${srcDir}/go-appimage/appimagetool-${version}-armhf.AppImage";
-    "i686" = "${srcDir}/go-appimage/appimagetool-${version}-i686.AppImage";
-  }."${cpuArch}";
-
-in stdenv.mkDerivation rec {
-
-  pname = "go-appimage";
-  inherit version src;
-  sourceRoot = "squashfs-root";
-
-  unpackPhase = ''
-    cp $src appimagetool
-    chmod u+wx appimagetool
-    ./appimagetool --appimage-extract
-  '';
-
-  installPhase = ''
-    mkdir -p $out
-    cp -r usr/* $out
-  '';
-}

nix/appimagetool/default.nix

@@ -0,0 +1,22 @@
+{ appimagekit, hostSystem, writeScriptBin }: let
+
+  arch = builtins.getAttr hostSystem {
+    "x86_64-linux" = "x86_64";
+    "aarch64-linux" = "aarch64";
+    "armv6l-linux" = "armhf";
+    "i686-linux" = "i686";
+  };
+
+  # https://github.com/AppImage/type2-runtime
+  # The author has set up some crazy continuous integration build system with
+  # github, which is really cool, except that it doesn't preserve any older
+  # builds of the project. And it's pretty difficult to build it ourselves. So
+  # fuck it, just embed the build artifacts directly in this project.
+  runtimeFileVersion = "81de3e1";
+  runtimeFile = "${./.}/runtime-${arch}-${runtimeFileVersion}";
+
+in writeScriptBin "appimagetool" ''
+    export PATH=$PATH:${appimagekit}/bin
+    export ARCH=${arch}
+    exec ${appimagekit}/bin/appimagetool --runtime-file ${runtimeFile} "$@"
+''

nix/garage/default.nix

@@ -8,6 +8,13 @@ rec {
     hostSystem,
   }: let
 
+    hostSystemTarget = builtins.getAttr hostSystem {
+      "x86_64-linux"  = "x86_64-unknown-linux-musl";
+      "aarch64-linux" =  "aarch64-unknown-linux-musl";
+      "i686-linux"    = "i686-unknown-linux-musl";
+      "armv6l-linux"  = "armv6l-unknown-linux-musleabihf";
+    };
+
     pkgs = pkgsNix.default {
       inherit buildSystem hostSystem;
     };
@@ -31,7 +38,7 @@ rec {
     compile = (import "${src}/nix/compile.nix") {
 
       system = buildSystem;
-      target = hostSystem;
+      target = hostSystemTarget;
       pkgsSrc = pkgsNix.src;
 
       cargo2nixOverlay = common.cargo2nixOverlay;

nix/nebula.nix

@@ -20,7 +20,7 @@
 
   vendorHash = "sha256-GvMiOEC3Y/pGG++Z+XCgLVADKymUR9shDxjx3xIz8u0=";
 
-  subPackages = [ "cmd/nebula" "cmd/nebula-cert" ];
+  subPackages = [ "cmd/nebula" ];
 
   ldflags = [ "-X main.Build=${version}" ];
 }

nix/pkgs.nix

@@ -9,6 +9,11 @@ rec {
         CGO_ENABLED=0;
         tags = [ "netgo" "timetzdata" ];
         ldflags = [ "-w" "-extldflags=-static" ];
+
+        # Not sure why buildGoModule doesn't handle this correctly.
+        GOARM = if prev.stdenv.hostPlatform.parsed.cpu.name == "armv6l"
+          then "6,hardfloat"
+          else null;
       };
     in {
       buildGoModule = args: prev.buildGoModule (buildArgs // args);
@@ -35,11 +40,16 @@ rec {
     sha256 = "sha256:1lr1h35prqkd1mkmzriwlpvxcb34kmhc9dnr48gkm8hh089hifmx";
   };
 
-  supportedSystems = [
-    "x86_64-linux"
-    "aarch64-linux"
-    "i686-linux"
-  ];
+  lib = import "${src}/lib";
+
+  crossSystems = {
+    "x86_64-linux" = {config = "x86_64-linux";};
+    "aarch64-linux" = lib.systems.examples.aarch64-multiplatform;
+    "i686-linux" = {config = "i686-linux";};
+    "armv6l-linux" = lib.systems.examples.raspberryPi;
+  };
+
+  supportedSystems = builtins.attrNames crossSystems;
 
   default = {
     buildSystem,
@@ -55,7 +65,6 @@ rec {
     # enabled, even if the target platform is actually the same as the build
     # platform (and therefore it's not really cross-compiling). So we only set
     # up the cross-compiling config if the target platform is different.
-    crossSystem.config = hostSystem;
-
+    crossSystem = builtins.getAttr hostSystem crossSystems;
   }));
 }

tasks/soon/code/raspberry-pi-build.md

@@ -1,7 +0,0 @@
----
-type: task
----
-
-# Raspberry Pi Build
-
-Get Isle build system to include rpi (armv7l-linux-musl)