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name: Docker with QEMU
on:
workflow_dispatch:
inputs:
nim_version:
description: Nim version (2.0.14)
required: true
type: string
platforms:
description: Platforms (linux/amd64,linux/arm64)
required: false
type: string
default: linux/amd64,linux/arm64
env:
DOCKER_FILE: Dockerfile
DOCKER_REPO: codexstorage/nim-lang
PLATFORMS: ${{ inputs.platforms }}
NIM_VERSION: ${{ inputs.nim_version }}
jobs:
docker:
runs-on: ubuntu-latest
steps:
- name: Login to Docker Hub
uses: docker/login-action@v3
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
- name: Set up QEMU
uses: docker/setup-qemu-action@v3
- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v3
- name: Build and push
uses: docker/build-push-action@v6
with:
platforms: ${{ env.PLATFORMS }}
push: true
tags: ${{ env.DOCKER_REPO }}:${{ env.NIM_VERSION }}
build-args: |
NIM_VERSION=${{ env.NIM_VERSION }}

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name: Docker
on:
workflow_dispatch:
inputs:
nim_version:
description: Nim version (2.0.14)
required: true
type: string
env:
DOCKER_FILE: Dockerfile
DOCKERHUB_REPO: codexstorage/nim-lang
NIM_VERSION: ${{ inputs.nim_version }}
amd64_builder: ubuntu-22.04
arm64_builder: ubuntu-22.04-arm
jobs:
compute:
name: Compute matrix
runs-on: ubuntu-latest
outputs:
matrix: ${{ steps.matrix.outputs.matrix }}
steps:
- name: Compute matrix
id: matrix
uses: fabiocaccamo/create-matrix-action@v5
with:
matrix: |
os {linux}, arch {amd64}, builder {${{ env.amd64_builder }}}
os {linux}, arch {arm64}, builder {${{ env.arm64_builder }}}
# Build platform specific image
build:
needs: compute
strategy:
fail-fast: true
matrix:
include: ${{ fromJson(needs.compute.outputs.matrix) }}
name: Build ${{ matrix.os }}/${{ matrix.arch }}
runs-on: ${{ matrix.builder }}
env:
PLATFORM: ${{ format('{0}/{1}', 'linux', matrix.arch) }}
steps:
- name: Checkout
uses: actions/checkout@v4
- name: Docker - Meta
id: meta
uses: docker/metadata-action@v5
with:
images: ${{ env.DOCKERHUB_REPO }}
- name: Docker - Set up Buildx
uses: docker/setup-buildx-action@v3
- name: Docker - Login to Docker Hub
uses: docker/login-action@v3
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
- name: Docker - Build and Push by digest
id: build
uses: docker/build-push-action@v6
with:
context: .
file: ${{ env.DOCKER_FILE }}
platforms: ${{ env.PLATFORM }}
push: true
build-args: |
NIM_VERSION=${{ env.NIM_VERSION }}
labels: ${{ steps.meta.outputs.labels }}
outputs: type=image,name=${{ env.DOCKERHUB_REPO }},push-by-digest=true,name-canonical=true,push=true
- name: Docker - Export digest
run: |
mkdir -p /tmp/digests
digest="${{ steps.build.outputs.digest }}"
touch "/tmp/digests/${digest#sha256:}"
- name: Docker - Upload digest
uses: actions/upload-artifact@v4
with:
name: digests-${{ matrix.arch }}
path: /tmp/digests/*
if-no-files-found: error
retention-days: 1
# Publish multi-platform image
publish:
name: Publish multi-platform image
runs-on: ubuntu-latest
needs: build
steps:
- name: Docker - Variables
run: |
# Set tags
echo "TAGS=${{ env.DOCKER_REPO }}:${{ env.NIM_VERSION }}" >> $GITHUB_ENV
- name: Docker - Download digests
uses: actions/download-artifact@v4
with:
path: /tmp/digests
pattern: digests-*
merge-multiple: true
- name: Docker - Set up Buildx
uses: docker/setup-buildx-action@v3
- name: Docker - Meta
id: meta
uses: docker/metadata-action@v5
with:
images: ${{ env.DOCKERHUB_REPO }}
tags: ${{ env.TAGS }}
- name: Docker - Login to Docker Hub
uses: docker/login-action@v3
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
- name: Docker - Create manifest list and push
working-directory: /tmp/digests
run: |
docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
$(printf '${{ env.DOCKERHUB_REPO }}@sha256:%s ' *)
- name: Docker - Inspect image
run: |
docker buildx imagetools inspect ${{ env.DOCKERHUB_REPO }}:${{ steps.meta.outputs.version }}

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ARG IMAGE=${IMAGE:-ubuntu:24.04}
ARG NIM_VERSION=${NIM_VERSION:-2.0.14}
ARG HOME=${HOME:-/root}
FROM ${IMAGE}
ARG NIM_VERSION
ARG HOME
WORKDIR ${HOME}
RUN apt-get update && \
apt-get install -y curl git gcc make && rm -rf /var/lib/apt/lists/* && \
curl https://raw.githubusercontent.com/emizzle/nimv/refs/heads/master/nimv.sh | bash -s "${NIM_VERSION}" && \
rm -rf "${HOME}/.nimv/${NIM_VERSION}/Nim/.git" && \
rm -rf "${HOME}/.nimv/${NIM_VERSION}/Nim/dist" && \
rm -rf "${HOME}/.nimv/${NIM_VERSION}/Nim/tests" && \
rm -rf "${HOME}/.nimv/${NIM_VERSION}/Nim/nimcache" && \
rm -rf "${HOME}/.nimv/${NIM_VERSION}/Nim/csources_v2"
ENV PATH=${HOME}/.nimble/bin:${PATH}

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# Nim lang Docker images
## Description
At Codex, we are using [Nim](https://nim-lang.org) programming language. Some of our projects are using pre-compiled Nim in Docker for Docker images to simplify and speed up the builds.
Also, we are using multi-arch Docker images and for that it is required to have multi-arch source images and we have the following issues with that
- :hourglass_flowing_sand: [Make Nim docker images official?](https://forum.nim-lang.org/t/9983)
- :hourglass_flowing_sand: [Provide official docker image #515](https://github.com/nim-lang/RFCs/issues/515)
- :x: [moigagoo/nimage](https://github.com/moigagoo/nimage) - Only amd64, outdated
- :scroll: [theAkito/docker-nim](https://github.com/theAkito/docker-nim) - License, outdated
- :hammer_and_wrench: [arm support for Linux #23](https://github.com/nim-lang/choosenim/issues/23)
Code in the repository provides a simple way to build multi-arch Docker images with a required Nim version. However, builds are triggered manually.
We are using GitHub Actions and rely on [nimv](https://github.com/emizzle/nimv) for Nim installation.
## Build your own images
1. Fork the repository.
2. Add GitHub Actions secrets - `DOCKERHUB_USERNAME` and `DOCKERHUB_TOKEN`.
3. Adjust workflow with your repository name.
4. Run workflow and pass required [Nim version](https://github.com/nim-lang/Nim/tags).
## Build manually
[Multi-platform builds](https://docs.docker.com/build/building/multi-platform/)
### On separate VMs
<details>
<summary>Build guide</summary>
### Build Docker images on separate VMs
1. Run `amd64`(`cx32` ,`cpx31`) and `arm64`(`cax21`) VMs on Hetzner
2. Install Docker
3. Clone repository
```shell
git clone
```
4. Define variables
```shell
repository="codexstorage/nim-lang"
nim_version="2.0.14"
```
5. Run the build on each VM
```shell
docker build \
--tag nim-lang:"${nim_version}" \
--build-arg NIM_VERSION="${nim_version}" \
--file Dockerfile .
```
6. Login to DockerHub
```shell
docker login -u <username>
```
7. Push image and get the digest on each VM
```shell
docker image tag nim-lang:"${nim_version}" "${repository}:${nim_version}"
docker image push ${repository}:${nim_version}
```
We will get a digest for each image and we need to define appropriate variables
```shell
amd64="sha256:43c1ea16d34528b3f195e18ca21f69987a01daaf0ddd5d94b252d37ebace2f5c"
arm64="sha256:4b4b3d6617c9bc698adefd0a27d1d18c5236016b92ee7ddc8c42311586568d91"
```
8. Create a manifest list for multi-arch image and push it from on one of the VM
```shell
docker buildx imagetools create \
-t "${repository}:${nim_version}" \
"${amd64}" \
"${arm64}"
```
Duration
| Platform | Build | Push | Size |
| -------- | ------------ | ----------- | ------- |
| `amd64` | `8m20.221s` | `1m17.620s` | `659MB` |
| `arm64` | `10m20.591s` | `0m48.888s` | `676MB` |
TOTAL: ~ `11m09s`
</details>
### On a single VM
<details>
<summary>Build guide</summary>
### Build Docker images on a single VM
1. Run `amd64`(`cx32` ,`cpx31`) VM on Hetzner
2. Install Docker
3. Clone repository
```shell
git clone
```
4. Define variables
```shell
repository="codexstorage/nim-lang"
nim_version="2.0.14"
```
5. Create a custom builder
```shell
docker buildx create \
--name container-builder \
--driver docker-container \
--bootstrap --use
```
6. Login to DockerHub
```shell
docker login -u <username>
```
7. Run the build for multiple platforms
```shell
docker buildx build \
--tag "${repository}:${nim_version}" \
--build-arg NIM_VERSION="${nim_version}" \
--platform linux/amd64,linux/arm64 \
--push \
--file Dockerfile .
```
Duration
| Platform | Build | Push | Size |
| -------- | ------------ | ----------- | ------- |
| `amd64` | `-` | `-` | `613MB` |
| `arm64` | `13m55.177s` | `0m42.444s` | `425MB` |
TOTAL: ~ `14m35s`
</details>
## Known issues
1. We are using [nimv](https://github.com/emizzle/nimv) which requires bash, so alpine images will not work.