Add aarch64 support

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

.github/workflows/nix.yml

@@ -18,11 +18,23 @@ jobs:
           - nixos-unstable
           - nixos-23.05
           - nixos-23.11
+        system:
+          - x86_64-linux
+          - aarch64-linux
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v25
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+      - uses: DeterminateSystems/nix-installer-action@main
+        with:
+          extra-conf: |
+            extra-platforms = aarch64-linux
+
       - run: nix-shell --run ./ci.sh
         env:
           CI_REGISTRY_AUTH: '${{ secrets.REGISTRY_AUTH }}'
           NIXPKGS_CHANNEL: '${{ matrix.channel }}'
+          NIX_SYSTEM_NAME: '${{ matrix.system }}'

ci.sh

@@ -8,6 +8,7 @@ channel=${NIXPKGS_CHANNEL:-nixos-unstable}
 registry=${CI_REGISTRY:-docker.io}
 registry_auth=${CI_REGISTRY_AUTH:-}
 image_prefix=${CI_PROJECT_PATH:-nixpkgs}
+system_name=${NIX_SYSTEM_NAME:-x86_64-linux}
 
 if [[ $channel == nixos-unstable ]]; then
   image_tag=latest
@@ -30,6 +31,7 @@ banner "Building images"
 nix-build \
   --no-out-link \
   --option sandbox true \
+  --argstr system "$system_name"
 
 if [[ $(git rev-parse --abbrev-ref HEAD) != master ]]; then
   banner "Skipping push on non-master branch"

default.nix

@@ -1,4 +1,6 @@
-let
-  pkgs = import ./pkgs.nix;
+{
+  system ? builtins.currentSystem
+}: let
+  pkgs = import ./pkgs.nix system;
 in
 pkgs.docker-nixpkgs

dockerhub-metadata

@@ -8,9 +8,10 @@ set -euo pipefail
 
 user=$1
 org=${2:-nixpkgs}
+system_name=${NIX_SYSTEM_NAME:-x86_64-linux}
 
 nix_eval() {
-  nix-instantiate --strict --eval --json "$@"
+  nix-instantiate --strict --eval --argstr system "$system_name" --json "$@"
 }
 
 releases_json=$(nix_eval)

pkgs.nix

@@ -1,7 +1,9 @@
-import <nixpkgs> {
+system:
 # docker images run on Linux
-  system = "x86_64-linux";
+assert builtins.elem system ["x86_64-linux" "aarch64-linux"];
+import <nixpkgs> {
   config = { };
+  inherit system;
   overlays = [
     (import ./overlay.nix)
   ];

push-all

@@ -6,8 +6,9 @@ set -euo pipefail
 registry=${1:-docker.io}
 image_prefix=${2:-nixpkgs}
 image_tag=${3:-latest}
+system_name=${NIX_SYSTEM_NAME:-x86_64-linux}
 
-releases_json=$(nix-instantiate --strict --eval --json)
+releases_json=$(nix-instantiate --strict --argstr system "$system_name" --eval --json)
 
 echo "=== Pushing images to $registry"
 

readme-image-matrix

@@ -3,9 +3,11 @@
 # Usage: ./dockerhub-image-matrix
 set -euo pipefail
 
+system_name=${NIX_SYSTEM_NAME:-x86_64-linux}
+
 ## Main ##
 
-releases_json=$(nix-instantiate --strict --eval --json)
+releases_json=$(nix-instantiate --strict --argstr system "$system_name" --eval --json)
 
 echo "| Image / Tag | Pull |"
 echo "| ---         | ---  |"