ARROW-16995: [CI][C++][MinGW] Don't cache site-packages (#13534)

It may revert updated Python related MSYS2 packages such as python-numpy. This caches built wheels instead. Authored-by: Sutou Kouhei <[email protected]> Signed-off-by: Sutou Kouhei <[email protected]>
apache · Jul 8, 2022 · 922f58f · 922f58f
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commit 922f58f
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diff --git a/.github/workflows/cpp.yml b/.github/workflows/cpp.yml
@@ -351,20 +351,20 @@ jobs:
             --output-document /usr/local/bin/minio.exe \
             https://dl.min.io/server/minio/release/windows-amd64/archive/minio.RELEASE.2022-05-26T05-48-41Z
           chmod +x /usr/local/bin/minio.exe
-      - name: Cache Python packages
+      - name: Cache Python wheels
         uses: actions/cache@v2
         with:
-          path: "d:/a/_temp/msys64/mingw${{ matrix.mingw-n-bits }}/lib/python*/site-packages"
-          key: cpp-gcs-testbench-mingw${{ matrix.mingw-n-bits }}-${{ hashFiles('ci/scripts/install_gcs_testbench.sh') }}
-          restore-keys: cpp-gcs-testbench-mingw${{ matrix.mingw-n-bits }}-
+          path: "${{ env.PIP_CACHE_DIR }}"
+          key: cpp-wheels-mingw${{ matrix.mingw-n-bits }}-${{ hashFiles('ci/scripts/install_gcs_testbench.sh') }}
+          restore-keys: cpp-wheels-mingw${{ matrix.mingw-n-bits }}-
       - name: Install Google Cloud Storage Testbench
         shell: msys2 {0}
         run: |
           ci/scripts/install_gcs_testbench.sh default
       - name: Test
         shell: msys2 {0}
         run: |
-          python_version=$(python -c "import sys; print('.'.join(map(str, sys.version_info[0:2])))")
+          python_version=$(python3 -c "import sys; print('.'.join(map(str, sys.version_info[0:2])))")
           export PYTHONHOME="$(cygpath --windows ${MINGW_PREFIX})\lib\python${python_version}"
           PYTHONPATH="${PYTHONHOME}"
           PYTHONPATH="${PYTHONPATH};${PYTHONHOME}\lib-dynload"

diff --git a/ci/scripts/msys2_setup.sh b/ci/scripts/msys2_setup.sh
@@ -82,3 +82,4 @@ pacman \
 
 "$(dirname $0)/ccache_setup.sh"
 echo "CCACHE_DIR=$(cygpath --absolute --windows ccache)" >> $GITHUB_ENV
+echo "PIP_CACHE_DIR=$(pip cache dir)" >> $GITHUB_ENV
Original file line number	Diff line number	Diff line change
Expand Up		@@ -82,3 +82,4 @@ pacman \

		"$(dirname $0)/ccache_setup.sh"
		echo "CCACHE_DIR=$(cygpath --absolute --windows ccache)" >> $GITHUB_ENV
		echo "PIP_CACHE_DIR=$(pip cache dir)" >> $GITHUB_ENV