From db2b4918e283034f9b3cf93b2f379eaf92032504 Mon Sep 17 00:00:00 2001
From: Jonas Thelemann <e-mail@jonas-thelemann.de>
Date: Tue, 11 Apr 2023 14:15:39 +0200
Subject: [PATCH] docker: Correct multi platform build for ARM (#936)

---
 Dockerfile | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 35e4347..96b277f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.20.2-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.20.2-alpine AS builder
 WORKDIR /go/src/github.com/tus/tusd
 
 # Add gcc and libc-dev early so it is cached
@@ -19,8 +19,12 @@ COPY pkg/ ./pkg/
 ARG GIT_VERSION
 ARG GIT_COMMIT
 
+# Get the operating system and architecture to build for
+ARG TARGETOS
+ARG TARGETARCH
+
 RUN set -xe \
-	&& GOOS=linux GOARCH=amd64 go build \
+	&& GOOS=$TARGETOS GOARCH=$TARGETARCH go build \
         -ldflags="-X github.com/tus/tusd/cmd/tusd/cli.VersionName=${GIT_VERSION} -X github.com/tus/tusd/cmd/tusd/cli.GitCommit=${GIT_COMMIT} -X 'github.com/tus/tusd/cmd/tusd/cli.BuildDate=$(date --utc)'" \
         -o /go/bin/tusd ./cmd/tusd/main.go