From 43569c11c280b0c8649f6736571b1d31ab9e5b8f Mon Sep 17 00:00:00 2001
From: Marco Neumann <marco@crepererum.net>
Date: Tue, 7 Dec 2021 09:26:03 +0100
Subject: [PATCH] ci: improve perf image build time by pre-fetching correct
 rust version

This avoids that we have to pull rustc and friends twice (once via
image, once when actually executing it).
---
 .circleci/config.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 49854a1192..664745a0e7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -346,7 +346,10 @@ jobs:
           command: |
             COMMIT_SHA=$(git rev-parse --short HEAD)
 
+            RUST_VERSION=$(sed -E -ne 's/channel = "(.*)"/\1/p' rust-toolchain.toml)
+
             docker buildx build \
+              --build-arg RUST_VERSION="$RUST_VERSION" \
               --build-arg RUSTFLAGS="-C target-feature=+avx2" \
               --progress plain \
               --tag quay.io/influxdb/iox:"$COMMIT_SHA" \