CI: Add github action to test build

Create a new backports tar based on recent supported kernel on every
push and test it against all supported kernel versions.

This uses the dev container to test the new commits.

This allows to test new changes to backports automatically using the
github CI system. It also makes it easier for others to test their
changes.

It also publishes the newly generated backports tar.gz file for further
manual testing.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 116 insertions, 0 deletions

diff --git a/.github/workflows/create.yml b/.github/workflows/create.yml
new file mode 100644
index 00000000..3fa4628b
--- /dev/null
+++ b/.github/workflows/create.yml
@@ -0,0 +1,116 @@
+name: Create and test backports tar
+
+on:
+  push:
+
+jobs:
+  create_tar:
+    name: Create backports tar
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Install coccinelle
+        run: |
+          sudo apt update
+          sudo apt install -y coccinelle
+
+      - name: Checkout backports
+        uses: actions/checkout@v4
+        with:
+          path: backports
+
+      - name: Checkout kernel 5.15
+        uses: actions/checkout@v4
+        with:
+          repository: gregkh/linux
+          ref: refs/heads/linux-5.15.y
+          path: linux
+
+      - name: Generate backports tar
+        working-directory: backports
+        run: ./gentree.py --refresh  ${GITHUB_WORKSPACE}/linux ${GITHUB_WORKSPACE}/backports-generated
+
+      - name: Check for git changes
+        working-directory: backports
+        run: git diff
+
+      - name: Pack backports-generated.tar.gz
+        run: tar cfz backports-generated.tar.gz backports-generated
+
+      - name: Upload backports-generated.tar.gz
+        uses: actions/upload-artifact@v4
+        with:
+          name: backports-generated.tar.gz
+          path: backports-generated.tar.gz
+
+
+  check_build:
+    name: Test backports tar
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/hauke/backports
+
+    needs: create_tar
+    continue-on-error: true
+    strategy:
+      matrix:
+        kernel: [
+           "4.4",
+           "4.5",
+           "4.6",
+           "4.7",
+           "4.8",
+           "4.9",
+           "4.10",
+           "4.11",
+           "4.12",
+           "4.13",
+           "4.14",
+           "4.15",
+           "4.16",
+           "4.17",
+           "4.18",
+           "4.19",
+           "4.20",
+           "5.0",
+           "5.1",
+           "5.2",
+           "5.3",
+           "5.4",
+           "5.5",
+           "5.6",
+           "5.7",
+           "5.8",
+           "5.9",
+           "5.10",
+           "5.11",
+           "5.12",
+           "5.13",
+           "5.14",
+           "5.15"]
+        config: [
+           allyesconfig,
+           defconfig-wifi]
+
+    steps:
+      - name: Checkout backports
+        uses: actions/checkout@v4
+        with:
+          path: backports
+
+      - name: Download backports-generated.tar.gz
+        uses: actions/download-artifact@v4
+        with:
+          name: backports-generated.tar.gz
+
+      - name: Unpack backports-generated.tar.gz
+        run: tar xf backports-generated.tar.gz
+
+      - name: Create build configuration
+        working-directory: backports-generated
+        run: make -j$(nproc) KLIB=/ksrc-backports/lib/modules/${{ matrix.kernel }}.*/build/ KLIB_BUILD=/ksrc-backports/lib/modules/${{ matrix.kernel }}.*/build/ ${{ matrix.config }}
+
+      - name: Build test
+        working-directory: backports-generated
+        run: make -j$(nproc) KLIB=/ksrc-backports/lib/modules/${{ matrix.kernel }}.*/build/ KLIB_BUILD=/ksrc-backports/lib/modules/${{ matrix.kernel }}.*/build/
+