ci: add ASan/LSan and UBSan jobs

.github/workflows/sanitizers.yml

@@ -0,0 +1,125 @@
+name: sanitizers
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  sanitize:
+    name: ${{ matrix.name }}
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: ASan + LeakSanitizer
+            sanitizer: asan
+            san_flag: address
+            san_opts: "detect_leaks=1:halt_on_error=1:symbolize=1"
+            extra_cflags: "-fno-omit-frame-pointer -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0"
+          - name: UBSan
+            sanitizer: ubsan
+            san_flag: undefined
+            san_opts: "halt_on_error=1:print_stacktrace=1"
+            extra_cflags: "-fno-omit-frame-pointer"
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Set up Python
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y clang llvm ninja-build pkg-config libglib2.0-dev libfuse3-dev fuse3 openssh-client openssh-server
+          pip3 install meson pytest pytest-timeout
+
+      - name: Setup SSH
+        run: |
+          mkdir -p ~/.ssh
+          chmod 700 ~/.ssh
+          ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519 -q -N ""
+          cat ~/.ssh/id_ed25519.pub > ~/.ssh/authorized_keys
+          chmod 600 ~/.ssh/authorized_keys
+          sudo systemctl start ssh || sudo service ssh start
+          ssh -o StrictHostKeyChecking=no -o BatchMode=yes localhost true
+
+      - name: Check FUSE availability
+        run: |
+          test -e /dev/fuse
+          command -v fusermount3
+          # test/util.py looks for the legacy name and skips the mount tests without it
+          command -v fusermount || sudo ln -s "$(command -v fusermount3)" /usr/local/bin/fusermount
+
+      - name: Build
+        env:
+          CC: clang
+          CFLAGS: ${{ matrix.extra_cflags }}
+        run: |
+          meson setup build -Db_sanitize=${{ matrix.san_flag }} -Db_lundef=false -Dwerror=true
+          ninja -C build
+
+      - name: Test
+        env:
+          ASAN_OPTIONS: "${{ matrix.sanitizer == 'asan' && format('{0}:log_path={1}/sanitizer/asan', matrix.san_opts, runner.temp) || '' }}"
+          LSAN_OPTIONS: "${{ matrix.sanitizer == 'asan' && format('suppressions={0}/test/lsan_suppress.txt', github.workspace) || '' }}"
+          UBSAN_OPTIONS: "${{ matrix.sanitizer == 'ubsan' && format('{0}:log_path={1}/sanitizer/ubsan', matrix.san_opts, runner.temp) || '' }}"
+          ASAN_SYMBOLIZER_PATH: /usr/bin/llvm-symbolizer
+        run: |
+          mkdir -p "$RUNNER_TEMP/sanitizer"
+          cd build
+          python3 -m pytest test/ --timeout=180 --maxfail=99 --junitxml=test-results.xml
+        timeout-minutes: 20
+
+      # Some tests expect sshfs to fail and only look at its exit status, so
+      # check for reports separately instead of relying on pytest.
+      - name: Check sanitizer reports
+        if: always()
+        run: |
+          shopt -s nullglob
+          reports=("$RUNNER_TEMP"/sanitizer/*)
+          for f in "${reports[@]}"; do
+            echo "::group::$f"
+            cat "$f"
+            echo "::endgroup::"
+          done
+          if [ ${#reports[@]} -gt 0 ]; then
+            echo "::error::${#reports[@]} sanitizer report(s)"
+            exit 1
+          fi
+
+      # A missing FUSE prerequisite makes the mount tests skip, not fail.
+      - name: Check no tests were skipped
+        run: |
+          python3 - build/test-results.xml <<'EOF'
+          import sys
+          import xml.etree.ElementTree as ET
+          root = ET.parse(sys.argv[1]).getroot()
+          suites = [root] if root.tag == "testsuite" else root.findall("testsuite")
+          skipped = sum(int(s.get("skipped", 0)) for s in suites)
+          if skipped:
+              print(f"::error::{skipped} test(s) were skipped")
+              sys.exit(1)
+          EOF
+
+      - name: Upload test results
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        if: always()
+        with:
+          name: test-results-${{ matrix.sanitizer }}
+          path: |
+            build/test-results.xml
+            build/meson-logs/
+            ${{ runner.temp }}/sanitizer/