From a9945fc528c950659793b6fb4979586297ea1497 Mon Sep 17 00:00:00 2001
From: Angus Gratton <angus@redyak.com.au>
Date: Wed, 11 Dec 2024 14:59:39 +1100
Subject: [PATCH] ci: Add caching of ccache for Zephyr.

Similar to the ESP32 builds, but needs additional step to pass the
ccache directory through to the Zephyr container.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>
---
 .github/workflows/ports_zephyr.yml | 4 ++++
 tools/ci.sh                        | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/.github/workflows/ports_zephyr.yml b/.github/workflows/ports_zephyr.yml
index ff3e19c7ea..eb85af6a36 100644
--- a/.github/workflows/ports_zephyr.yml
+++ b/.github/workflows/ports_zephyr.yml
@@ -42,6 +42,10 @@ jobs:
         # cache the "workspace"
         path: ./zephyrproject
         key: zephyr-workspace-${{ steps.versions.outputs.ZEPHYR }}
+    - name: ccache
+      uses: hendrikmuhs/ccache-action@v1.2
+      with:
+        key: zephyr
     - name: Install packages
       run: source tools/ci.sh && ci_zephyr_setup
     - name: Install Zephyr
diff --git a/tools/ci.sh b/tools/ci.sh
index d4bfe49336..c67aeed0ce 100755
--- a/tools/ci.sh
+++ b/tools/ci.sh
@@ -754,12 +754,15 @@ function ci_zephyr_setup {
     # Directories cached by GitHub Actions, mounted
     # into the container
     ZEPHYRPROJECT_DIR="$(pwd)/zephyrproject"
+    CCACHE_DIR="$(pwd)/.ccache"
 
     mkdir -p "${ZEPHYRPROJECT_DIR}"
+    mkdir -p "${CCACHE_DIR}"
 
     docker run --name zephyr-ci -d -it \
       -v "$(pwd)":/micropython \
       -v "${ZEPHYRPROJECT_DIR}":/zephyrproject \
+      -v "${CCACHE_DIR}":/root/.cache/ccache \
       -e ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZEPHYR_SDK_VERSION} \
       -e ZEPHYR_TOOLCHAIN_VARIANT=zephyr \
       -e ZEPHYR_BASE=/zephyrproject/zephyr \