From be323ed3e2754f2688f4919c1bd44139bf1ad5b7 Mon Sep 17 00:00:00 2001
From: Sonic Build Admin <sonicbld@microsoft.com>
Date: Fri, 12 Sep 2025 02:05:13 +0000
Subject: [PATCH] Add rust to buster

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#### Why I did it
Rust was added to bookworm, but is missing in bullseye build. Sonic-swss-common needs rust to build after https://github.com/sonic-net/sonic-swss-common/pull/1044, and byster vs build failures were seen due to missing rust.

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it

#### How to verify it

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#### Which release branch to backport (provide reason below if selected)

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- [ ] 202205
- [ ] 202211
- [ ] 202305
- [ ] 202311
- [ ] 202405
- [ ] 202411
- [ ] 202505

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- [ ] <!-- image version 1 -->
- [ ] <!-- image version 2 -->

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#### A picture of a cute animal (not mandatory but encouraged)
---
 sonic-slave-buster/Dockerfile.j2 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sonic-slave-buster/Dockerfile.j2 b/sonic-slave-buster/Dockerfile.j2
index b65a1a0895..2a3e203c77 100644
--- a/sonic-slave-buster/Dockerfile.j2
+++ b/sonic-slave-buster/Dockerfile.j2
@@ -672,3 +672,15 @@ LABEL "com.azure.dev.pipelines.agent.handler.node.path"="/usr/bin/node"
 ARG bazelisk_url=https://github.com/bazelbuild/bazelisk/releases/latest/download/bazelisk-linux-{{ CONFIGURED_ARCH }}
 RUN curl -fsSL -o /usr/local/bin/bazel ${bazelisk_url} && chmod 755 /usr/local/bin/bazel
 {% endif -%}
+
+# Install Rust
+ARG RUST_ROOT=/usr/.cargo
+RUN RUSTUP_HOME=$RUST_ROOT CARGO_HOME=$RUST_ROOT bash -c 'curl --proto "=https" -sSf https://sh.rustup.rs | sh -s -- --default-toolchain 1.86.0 -y'
+{% if CROSS_BUILD_ENVIRON == "y" and CONFIGURED_ARCH == "armhf" %}
+RUN mkdir -p /.cargo && $RUST_ROOT/bin/rustup target add armv7-unknown-linux-gnueabihf && echo "[target.armv7-unknown-linux-gnueabihf]\nlinker = \"arm-linux-gnueabihf-gcc\"" >> /.cargo/config.toml
+{% endif -%}
+{% if CROSS_BUILD_ENVIRON == "y" and CONFIGURED_ARCH == "arm64" %}
+RUN mkdir -p /.cargo && $RUST_ROOT/bin/rustup target add aarch64-unknown-linux-gnu && echo "[target.aarch64-unknown-linux-gnu]\nlinker = \"aarch64-linux-gnu-gcc\"" >> /.cargo/config.toml
+{% endif -%}
+ENV RUSTUP_HOME $RUST_ROOT
+ENV PATH $PATH:$RUST_ROOT/bin