Add GitHub CI and fix test runner bugs

.github/workflows/ci.yml

@@ -0,0 +1,74 @@
+name: ci
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-22.04
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Java 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'adopt'
+
+      - name: mvn package
+        run: mvn package -DskipTests
+
+      - name: upload bcc/target/bcc.jar
+        uses: actions/upload-artifact@v4
+        with:
+          name: bcc.jar
+          path: bcc/target/bcc.jar
+
+  vm-test:
+    name: Run tests on pre-built kernel
+    runs-on: ubuntu-22.04
+    needs: build
+    timeout-minutes: 10
+    strategy:
+      matrix:
+        version: ["6.6"]
+    env:
+      HBT_KERNEL_VERSION: "${{ matrix.version }}"
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'adopt'
+
+      - run: sudo pip3 install https://github.com/amluto/virtme/archive/beb85146cd91de37ae455eccb6ab67c393e6e290.zip
+      - run: sudo apt-get update && sudo apt-get install -y --no-install-recommends qemu-system-x86 bpfcc-tools
+
+      - name: Check that bcc and the container work
+        run:  timeout 120 testutil/run-in-container.sh $HBT_KERNEL_VERSION python3 pysamples/bcc/hello_world.py
+
+      - name: Find libbcc.so
+        run: |
+          # find libbcc.so
+          locate libbcc.so
+          # using find
+          find / -name libbcc.so
+      - name: Test
+        run: mvn test -Djvm=testutil/bin/java
+
+      - name: Publish Test Report
+        uses: mikepenz/action-junit-report@v4
+        if: always()
+        with:
+          check_name: 'Test Report (Kernel ${{ matrix.KERNEL_VERSION }})'
+          report_paths: '**/build/test-results/test/TEST-*.xml'

README.md

@@ -1,6 +1,8 @@
 Hello eBPF
 ==========
 
+[![ci](https://github.com/parttimenerd/hello-ebpf/actions/workflows/ci.yml/badge.svg)](https://github.com/parttimenerd/hello-ebpf/actions/workflows/ci.yml)
+
 There are [user land libraries](https://ebpf.io/what-is-ebpf/#development-toolchains) for [eBPF](https://ebpf.io) that allow you to
 write eBPF applications in C++, Rust, Go, Python and even
 Lua. But there are none for Java, which is a pity.

testutil/bin/java

@@ -6,7 +6,7 @@
 #
 # Configuration per environment variables:
 #  - `HBT_JAVA_BINARY` - the java binary to use (default: `java`)
-#  - `HBT_KERNEL_VERSION` - the kernel version to use (default: `6.7`)
+#  - `HBT_KERNEL_VERSION` - the kernel version to use (default: `6.6`)
 #                           see https://ghcr.io/cilium/ci-kernels for available versions
 #
 # Has to reside in bin/java so it can be passed to the `-Djvm` maven option.
@@ -20,8 +20,7 @@ set -e
 HBT_JAVA_BINARY=${HBT_JAVA_BINARY:-java}
 
 # The kernel version to use
-HBT_KERNEL_VERSION=${HBT_KERNEL_VERSION:-6.7}
+HBT_KERNEL_VERSION=${HBT_KERNEL_VERSION:-6.6}
 
 testutil_dir=$(dirname "$0")/..
-$testutil_dir/run-in-container.sh $HBT_KERNEL_VERSION $HBT_JAVA_BINARY $@
-exit 0
+$testutil_dir/run-in-container.sh $HBT_KERNEL_VERSION $HBT_JAVA_BINARY $@

testutil/find_and_get_kernel.py

@@ -135,8 +135,6 @@ def copy_headers_into_dest(arch: str, version: str, dest_root: Path):
     argparse.add_argument("version", help="Kernel version")
     argparse.add_argument("destination", help="Destination folder")
     args = argparse.parse_args()
-    print(
-        f"Downloading headers for {args.version} (arch {get_arch()}) into {args.destination}")
     copy_headers_into_dest(get_arch(),
                            args.version,
                            Path(args.destination))

testutil/run-in-container.sh

@@ -72,6 +72,12 @@ fi
 # get exact kernel version which is "$input/lib/modules/<version>/updates"
 kernel_version=$(basename "$(find "${input}/lib/modules" -maxdepth 1 -type d)")
 
+# /lib is a symlink which causes problems
+mkdir "$input"/lib2
+cp -r "$input"/lib/modules "$input"/lib2
+rm -r "$input"/lib
+mv $input/lib2 $input/lib
+
 "$script_folder"/find_and_get_kernel.py "${kernel_version}" "$input"
 
 mkdir -p "$input"/root

testutil/setup-and-run.sh

@@ -9,8 +9,13 @@ if [[ -d "/run/input/usr/src/linux/tools/testing/selftests/bpf" ]]; then
   export KERNEL_SELFTESTS="/run/input/usr/src/linux/tools/testing/selftests/bpf"
 fi
 
-if [[ -d "/run/input/lib/modules" ]]; then
-  find /run/input/lib/modules -type f -name bpf_testmod.ko -exec insmod {} \;
-fi
+#if [[ -d "/run/input/lib/modules" ]]; then
+#  find /run/input/lib/modules -type f -name bpf_testmod.ko -exec insmod {} \;
+#fi
+
+# used for debugging to check if bcc works at all
+#script_dir="$(dirname "$(realpath "$0")")"
+#timeout 5 python3 $script_dir/../pysamples/bcc/hello_world.py
+
 
 $* && touch /run/output/status