From d39bfa26e686c51fc7e71e3798992d80de24368a Mon Sep 17 00:00:00 2001
From: Paul Kehrer <161495+reaperhulk@users.noreply.github.com>
Date: Thu, 1 Oct 2026 12:55:46 +0000
Subject: [PATCH] CI: install ARMv7 Rust toolchains into a fresh rustup home

---
 .github/workflows/ci.yml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 013e486d1..8692ea5dd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -182,7 +182,8 @@ jobs:
           - os: ubuntu-24.04-arm
             container:
               image: ghcr.io/pyca/cryptography-runner-ubuntu-rolling:armv7l
-              options: --env RUSTUP_HOME=/root/.rustup
+              # A fresh home avoids upgrading the image's incomplete Rust installation.
+              options: --env RUSTUP_HOME=/tmp/verified-garbage-rustup
           - os: macos-latest
           - os: windows-latest
         rust: [stable, "1.88"]
@@ -269,7 +270,8 @@ jobs:
     runs-on: ubuntu-24.04-arm
     container:
       image: ghcr.io/pyca/cryptography-runner-ubuntu-rolling:armv7l
-      options: --env RUSTUP_HOME=/root/.rustup
+      # A fresh home avoids upgrading the image's incomplete Rust installation.
+      options: --env RUSTUP_HOME=/tmp/verified-garbage-rustup
     env:
       RUSTUP_TOOLCHAIN: ${{ matrix.rust }}
       # For every cargo command, with the container's native linker.