From d7da885a8fab10fad77aff1d5d1c0868fcf78750 Mon Sep 17 00:00:00 2001
From: AeonLucid <aeonlucid@gmail.com>
Date: Wed, 30 Sep 2020 23:34:12 +0200
Subject: [PATCH] Multiarch dockerfile

---
 .github/workflows/docker.yml               |  2 +-
 Dockerfile                                 | 29 +++++++++++++++++-----
 src/Impostor.Server/Impostor.Server.csproj |  1 -
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index cf1b936..54e67cb 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -67,6 +67,6 @@ jobs:
         with:
           context: .
           file: ./Dockerfile
-          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          platforms: linux/amd64,linux/arm/v7
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.prep.outputs.tags }}
diff --git a/Dockerfile b/Dockerfile
index 472694a..656237d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,9 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
+
+# See for all possible platforms
+# https://github.com/containerd/containerd/blob/master/platforms/platforms.go#L17
+ARG TARGETARCH
+
 WORKDIR /source
 
 # Copy csproj and restore.
@@ -6,17 +11,29 @@ COPY src/Impostor.Server/Impostor.Server.csproj ./src/Impostor.Server/Impostor.S
 COPY src/Impostor.Shared/Impostor.Shared.csproj ./src/Impostor.Shared/Impostor.Shared.csproj
 COPY submodules/Hazel-Networking/Hazel/Hazel.csproj ./submodules/Hazel-Networking/Hazel/Hazel.csproj
 
-RUN dotnet restore -r linux-musl-x64 ./src/Impostor.Server/Impostor.Server.csproj && \
-    dotnet restore -r linux-musl-x64 ./src/Impostor.Shared/Impostor.Shared.csproj && \
-    dotnet restore -r linux-musl-x64 ./submodules/Hazel-Networking/Hazel/Hazel.csproj
+RUN case "$TARGETARCH" in \
+    amd64)  NETCORE_PLATFORM='linux-x64';; \
+    arm64)  NETCORE_PLATFORM='linux-arm64';; \
+    arm)    NETCORE_PLATFORM='linux-arm';; \
+    *) echo "unsupported architecture"; exit 1 ;; \
+  esac && \
+  dotnet restore -r "$NETCORE_PLATFORM" ./src/Impostor.Server/Impostor.Server.csproj && \
+  dotnet restore -r "$NETCORE_PLATFORM" ./src/Impostor.Shared/Impostor.Shared.csproj && \
+  dotnet restore -r "$NETCORE_PLATFORM" ./submodules/Hazel-Networking/Hazel/Hazel.csproj
 
 # Copy everything else.
 COPY submodules/. ./submodules/
 COPY src/. ./src/
-RUN dotnet publish -c release -o /app -r linux-musl-x64 --no-restore ./src/Impostor.Server/Impostor.Server.csproj
+RUN case "$TARGETARCH" in \
+    amd64)  NETCORE_PLATFORM='linux-x64';; \
+    arm64)  NETCORE_PLATFORM='linux-arm64';; \
+    arm)    NETCORE_PLATFORM='linux-arm';; \
+    *) echo "unsupported architecture"; exit 1 ;; \
+  esac && \
+  dotnet publish -c release -o /app -r "$NETCORE_PLATFORM" --no-restore ./src/Impostor.Server/Impostor.Server.csproj
 
 # Final image.
-FROM mcr.microsoft.com/dotnet/core/runtime-deps:3.1-alpine
+FROM mcr.microsoft.com/dotnet/core/runtime-deps:3.1
 WORKDIR /app
 COPY --from=build /app ./
 EXPOSE 22023/udp
diff --git a/src/Impostor.Server/Impostor.Server.csproj b/src/Impostor.Server/Impostor.Server.csproj
index 0387f84..617d290 100644
--- a/src/Impostor.Server/Impostor.Server.csproj
+++ b/src/Impostor.Server/Impostor.Server.csproj
@@ -3,7 +3,6 @@
     <PropertyGroup>
         <OutputType>Exe</OutputType>
         <TargetFramework>netcoreapp3.1</TargetFramework>
-        <RuntimeIdentifiers>win-x64;linux-x64;linux-musl-x64</RuntimeIdentifiers>
         <PublishTrimmed>true</PublishTrimmed>
         <AssemblyTitle>Impostor.Server</AssemblyTitle>
         <Product>Impostor.Server</Product>
-- 
2.39.5