From 374ae5b8f3af3fe5720822dbd393e4945e90e0eb Mon Sep 17 00:00:00 2001
From: Avi Deitcher <avi@deitcher.net>
Date: Sun, 18 Aug 2024 10:54:45 +0300
Subject: [PATCH] cross-compile cargo plugins

Signed-off-by: Avi Deitcher <avi@deitcher.net>
---
 Dockerfile | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index ed3b062..a5c165f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,23 @@
 ARG RUST_VERSION=1.80.1
-FROM rust:${RUST_VERSION}-alpine3.20
-ENV TARGETS="x86_64-unknown-linux-musl aarch64-unknown-linux-musl x86_64-unknown-linux-gnu aarch64-unknown-linux-gnu riscv64gc-unknown-linux-gnu"
+
+FROM --platform=$BUILDPLATFORM tonistiigi/xx AS xx
+
+FROM --platform=$BUILDPLATFORM rust:${RUST_VERSION}-alpine3.20 AS builder
+ARG TARGETARCH
+ARG TARGETOS
+COPY --from=xx / /
+RUN echo $(xx-info march)-unknown-$(xx-info os)-musl > /etc/rustc_target
+
+RUN rustup target add $(cat /etc/rustc_target)
+# needed for cargo-chef and cargo-sbom
+RUN apk add musl-dev linux-headers make
+RUN cargo install --target=$(cat /etc/rustc_target) cargo-chef@0.1.67 cargo-sbom@0.9.1
+
+FROM rust:${RUST_VERSION}-alpine3.20 AS toolchain
+ARG TARGETS="x86_64-unknown-linux-musl aarch64-unknown-linux-musl x86_64-unknown-linux-gnu aarch64-unknown-linux-gnu riscv64gc-unknown-linux-gnu"
 RUN rustup target add ${TARGETS}
 
-# needed for cargo-chef and cargo-sbom, as well as many other compilations
+# needed for downstream compilations
 RUN apk add musl-dev linux-headers make
-RUN cargo install cargo-chef@0.1.67 cargo-sbom@0.9.1
+COPY --from=builder /usr/local/cargo/bin/cargo-chef /usr/local/cargo/bin
+COPY --from=builder /usr/local/cargo/bin/cargo-sbom /usr/local/cargo/bin