From e9c191c6a0ca51b65c249ac75855c1e0a60bc83d Mon Sep 17 00:00:00 2001
From: Benedek Kozma <cyberbeni@gmail.com>
Date: Sun, 27 Oct 2024 15:19:36 +0100
Subject: [PATCH] Use static Linux SDK in Dockerfile (#1915)

---
 .dockerignore                  | 35 ++++++++++++++++++++++++++++++++++
 .github/workflows/docker.yml   |  7 ++-----
 CommandLineTool/main.swift     |  4 +++-
 Dockerfile                     | 22 ++++++++++++---------
 Scripts/build-linux-release.sh | 26 +++++++++++++++++++++++++
 5 files changed, 79 insertions(+), 15 deletions(-)
 create mode 100644 .dockerignore
 create mode 100755 Scripts/build-linux-release.sh

diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 000000000..e7125ec55
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,35 @@
+Dockerfile
+.dockerignore
+.git
+.github
+.gitignore
+
+# Everything from .gitignore
+# OS X
+.DS_Store
+
+# Xcode
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+*.dot
+.build
+.swiftpm
+
+/Snapshots/Private
+swiftformat.artifactbundle.zip
+
+# AppCode
+.idea
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index fb9fe6159..b6991ecb6 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -31,11 +31,6 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-        with:
-          platforms: arm64
-
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v3
@@ -52,6 +47,8 @@ jobs:
         with:
           context: .
           platforms: linux/amd64, linux/arm64
+          no-cache: true
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          provenance: false
diff --git a/CommandLineTool/main.swift b/CommandLineTool/main.swift
index 1a68379d9..55d619730 100644
--- a/CommandLineTool/main.swift
+++ b/CommandLineTool/main.swift
@@ -35,8 +35,10 @@ import Foundation
     import Darwin.POSIX
 #elseif os(Windows)
     import ucrt
-#else
+#elseif canImport(Glibc)
     import Glibc
+#elseif canImport(Musl)
+    import Musl
 #endif
 
 #if SWIFT_PACKAGE
diff --git a/Dockerfile b/Dockerfile
index 5bfb69658..44ebeecee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,15 +1,19 @@
 # syntax=docker/dockerfile:1
 
-# Swift official image with arm64 support
-# https://hub.docker.com/r/arm64v8/swift/
-ARG SWIFT_IMAGE=swift:focal
+# Base image and static SDK have to be updated together.
+FROM --platform=$BUILDPLATFORM swift:6.0.1 AS builder
+WORKDIR /workspace
+RUN swift sdk install \
+	https://download.swift.org/swift-6.0.1-release/static-sdk/swift-6.0.1-RELEASE/swift-6.0.1-RELEASE_static-linux-0.0.1.artifactbundle.tar.gz \
+	--checksum d4f46ba40e11e697387468e18987ee622908bc350310d8af54eb5e17c2ff5481
 
-FROM $SWIFT_IMAGE AS builder
 COPY . /workspace
-WORKDIR /workspace
-RUN swift build -c release && mv `swift build -c release --show-bin-path`/swiftformat /workspace
+ARG TARGETPLATFORM
+RUN --mount=type=cache,target=/workspace/.build,id=build-$TARGETPLATFORM \
+	./Scripts/build-linux-release.sh && \
+	cp /workspace/.build/release/swiftformat /workspace
 
-FROM $SWIFT_IMAGE-slim AS runner
-COPY --from=builder /workspace/swiftformat /usr/bin
-ENTRYPOINT [ "swiftformat" ]
+FROM scratch AS runner
+COPY --from=builder /workspace/swiftformat /usr/bin/swiftformat
+ENTRYPOINT [ "/usr/bin/swiftformat" ]
 CMD ["."]
diff --git a/Scripts/build-linux-release.sh b/Scripts/build-linux-release.sh
new file mode 100755
index 000000000..8d256f338
--- /dev/null
+++ b/Scripts/build-linux-release.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -eo pipefail
+
+pushd "$(dirname "${BASH_SOURCE[0]}")/.." > /dev/null
+
+BUILD_ARGS=(
+	--product swiftformat
+	--configuration release
+)
+
+if [[ -z "$TARGETPLATFORM" ]]; then
+	ARCH="$(uname -m)"
+else
+	if [[ "$TARGETPLATFORM" = "linux/amd64" ]]; then
+		ARCH="x86_64"
+	elif [[ "$TARGETPLATFORM" = "linux/arm64" ]]; then
+		ARCH="aarch64"
+	else
+		echo "Unsupported target platform: $TARGETPLATFORM"
+		exit 1
+	fi
+fi
+BUILD_ARGS+=(--swift-sdk "${ARCH}-swift-linux-musl")
+
+swift build "${BUILD_ARGS[@]}"