[Python-checkins] bpo-45695: Test out-of-tree builds on GHA (GH-29904)

[tiran]

https://github.com/python/cpython/commit/cee07b162843694e8166ad8715162d4d5886b50f
commit: cee07b162843694e8166ad8715162d4d5886b50f
branch: main
author: Christian Heimes <christian at python.org>
committer: tiran <christian at python.org>
date: 2021-12-04T11:07:59+01:00
summary:

bpo-45695: Test out-of-tree builds on GHA (GH-29904)

files:
A Misc/NEWS.d/next/Tests/2021-12-03-14-19-16.bpo-45695.QKBn2E.rst
M .github/workflows/build.yml

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fe4b14828699c..fbf7bb6fe2128 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -179,13 +179,28 @@ jobs:
         echo "PATH=/usr/lib/ccache:$PATH" >> $GITHUB_ENV
     - name: Configure ccache action
       uses: hendrikmuhs/ccache-action at v1
-    - name: Configure CPython
-      run: ./configure --with-pydebug --with-openssl=$OPENSSL_DIR
-    - name: Build CPython
+    - name: Setup directory envs for out-of-tree builds
+      run: |
+        echo "CPYTHON_RO_SRCDIR=$(realpath -m ${GITHUB_WORKSPACE}/../cpython-ro-srcdir)" >> $GITHUB_ENV
+        echo "CPYTHON_BUILDDIR=$(realpath -m ${GITHUB_WORKSPACE}/../cpython-builddir)" >> $GITHUB_ENV
+    - name: Create directories for read-only out-of-tree builds
+      run: mkdir -p $CPYTHON_RO_SRCDIR $CPYTHON_BUILDDIR
+    - name: Bind mount sources read-only
+      run: sudo mount --bind -o ro $GITHUB_WORKSPACE $CPYTHON_RO_SRCDIR
+    - name: Configure CPython out-of-tree
+      working-directory: ${{ env.CPYTHON_BUILDDIR }}
+      run: ../cpython-ro-srcdir/configure --with-pydebug --with-openssl=$OPENSSL_DIR
+    - name: Build CPython out-of-tree
+      working-directory: ${{ env.CPYTHON_BUILDDIR }}
       run: make -j4
     - name: Display build info
+      working-directory: ${{ env.CPYTHON_BUILDDIR }}
       run: make pythoninfo
+    - name: Remount sources writable for tests
+      # some tests write to srcdir, lack of pyc files slows down testing
+      run: sudo mount $CPYTHON_RO_SRCDIR -oremount,rw
     - name: Tests
+      working-directory: ${{ env.CPYTHON_BUILDDIR }}
       run: xvfb-run make buildbottest TESTOPTS="-j4 -uall,-cpu"
 
   build_ubuntu_ssltests:
diff --git a/Misc/NEWS.d/next/Tests/2021-12-03-14-19-16.bpo-45695.QKBn2E.rst b/Misc/NEWS.d/next/Tests/2021-12-03-14-19-16.bpo-45695.QKBn2E.rst
new file mode 100644
index 0000000000000..14ecd923dbd55
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2021-12-03-14-19-16.bpo-45695.QKBn2E.rst
@@ -0,0 +1 @@
+Out-of-tree builds with a read-only source directory are now tested by CI.