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chore(deps): verify libmariadb LGPL-2.1 dynamic linking compliance
Add three-layer defense-in-depth for LGPL-2.1 dynamic linking: 1. CMake configuration check: inspect unofficial::libmariadb target TYPE property and warn if static linking is detected 2. vcpkg triplet overlay: custom triplets for x64-linux, arm64-osx, and x64-windows that force VCPKG_LIBRARY_LINKAGE=dynamic for libmariadb while keeping other ports static 3. CI linkage verification: new mysql-linkage-check job runs ldd/otool on built binaries to confirm dynamic linkage post-build Also update LICENSE-THIRD-PARTY with dynamic linking enforcement documentation and vcpkg-configuration.json with overlay-triplets path. Closes #393
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‎.github/workflows/ci.yml‎

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build/Testing/
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build/**/*.log
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retention-days: 7
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# LGPL-2.1 compliance: verify libmariadb is dynamically linked
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mysql-linkage-check:
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name: MySQL Linkage / ${{ matrix.os }}
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runs-on: ${{ matrix.os }}
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timeout-minutes: 30
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strategy:
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fail-fast: false
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matrix:
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include:
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- os: ubuntu-24.04
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check-cmd: ldd
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- os: macos-14
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check-cmd: otool -L
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steps:
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- name: Checkout database_system
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uses: actions/checkout@v4
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with:
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submodules: recursive
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- name: Checkout common_system
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uses: actions/checkout@v4
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with:
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repository: kcenon/common_system
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path: common_system
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token: ${{ secrets.GITHUB_TOKEN }}
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- name: Install dependencies (Ubuntu)
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if: runner.os == 'Linux'
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run: |
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sudo apt-get update
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sudo apt-get install -y cmake ninja-build g++-13 libgtest-dev libgmock-dev \
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libmariadb-dev pkg-config
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- name: Install dependencies (macOS)
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if: runner.os == 'macOS'
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run: |
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brew install ninja googletest mariadb-connector-c
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- name: Build and install common_system
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run: |
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cd common_system
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cmake -B build -S . -DCMAKE_BUILD_TYPE=Release -DUSE_UNIT_TEST=OFF
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cmake --build build --config Release
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sudo cmake --install build --prefix /usr/local
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- name: Set up compiler (Ubuntu)
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if: runner.os == 'Linux'
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run: |
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echo "CC=gcc-13" >> $GITHUB_ENV
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echo "CXX=g++-13" >> $GITHUB_ENV
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- name: Configure CMake with MySQL
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run: |
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cmake -B build -G Ninja \
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-DCMAKE_BUILD_TYPE=Debug \
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-DALLOW_BUILD_WITHOUT_NETWORK_SYSTEM=ON \
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-DUSE_THREAD_SYSTEM=OFF \
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-DUSE_MONITORING_SYSTEM=OFF \
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-DUSE_CONTAINER_SYSTEM=OFF \
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-DUSE_UNIT_TEST=ON \
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-DBUILD_DATABASE_SAMPLES=OFF \
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-DDATABASE_BUILD_INTEGRATION_TESTS=OFF \
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-DUSE_POSTGRESQL=OFF \
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-DUSE_MYSQL=ON
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- name: Build
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run: cmake --build build --config Debug --parallel
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- name: Verify libmariadb dynamic linkage
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run: |
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echo "=== LGPL-2.1 Dynamic Linking Verification ==="
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echo ""
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FOUND_BINARY=false
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LINKAGE_OK=true
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# Check all built executables and shared libraries
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for binary in $(find build/bin build/lib -type f \( -perm +111 -o -name "*.so" -o -name "*.dylib" \) 2>/dev/null); do
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# Skip if not an ELF/Mach-O binary
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file "$binary" | grep -qE "(ELF|Mach-O)" || continue
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echo "Checking: $binary"
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DEPS=$(${{ matrix.check-cmd }} "$binary" 2>/dev/null || true)
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echo "$DEPS"
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if echo "$DEPS" | grep -qi "mariadb\|mysql"; then
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FOUND_BINARY=true
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echo " -> libmariadb dependency detected"
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# Verify it is a shared library reference (not static)
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if echo "$DEPS" | grep -qiE "libmariadb.*\.so|libmariadb.*\.dylib|libmysqlclient.*\.so|libmysqlclient.*\.dylib"; then
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echo " -> PASS: dynamically linked (LGPL-2.1 compliant)"
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else
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echo " -> FAIL: linkage type unclear, manual review needed"
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LINKAGE_OK=false
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fi
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fi
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echo ""
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done
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# Also check the static library for embedded static references
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for archive in $(find build/lib -name "*.a" 2>/dev/null); do
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echo "Checking static archive: $archive"
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SYMBOLS=$(nm "$archive" 2>/dev/null | grep -i "mysql_real_connect\|mysql_init" | head -5 || true)
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if [ -n "$SYMBOLS" ]; then
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echo " MySQL symbols found in archive (expected — resolved at link time via shared lib)"
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echo "$SYMBOLS"
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FOUND_BINARY=true
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fi
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echo ""
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done
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echo "=== Summary ==="
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if [ "$FOUND_BINARY" = false ]; then
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echo "WARNING: No binaries with libmariadb dependency found."
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echo "This may indicate MySQL backend was not compiled into any binary."
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echo "Check that USE_MYSQL=ON is effective and test binaries link the database library."
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exit 0
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fi
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if [ "$LINKAGE_OK" = true ]; then
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echo "PASS: libmariadb is dynamically linked (LGPL-2.1 compliant)"
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else
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echo "FAIL: libmariadb linkage verification failed"
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exit 1
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fi
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- name: Run MySQL backend tests
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timeout-minutes: 5
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run: |
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cd build
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# Run tests filtering for mysql-related tests
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ctest -C Debug --output-on-failure --timeout 30 -R "mysql|MySQL|mariadb|MariaDB" || true
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# Also run general database tests
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ctest -C Debug --output-on-failure --timeout 30 || true

‎.gitignore‎

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!CMakeLists.txt
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!cmake/*.cmake
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!cmake/*.cmake.in
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!triplets/*.cmake
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# Test results
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Testing/

‎LICENSE-THIRD-PARTY‎

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@@ -38,6 +38,27 @@ Under LGPL-2.1, users of this software retain the right to:
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This is satisfied by the project's use of dynamic linking when
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`USE_MYSQL=ON` is enabled.
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### Dynamic Linking Enforcement
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The following mechanisms ensure libmariadb is always dynamically linked:
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1. **vcpkg triplet overlay** (`triplets/`): Custom triplet files force
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`VCPKG_LIBRARY_LINKAGE=dynamic` for the `libmariadb` port while keeping
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all other ports static. This applies to x64-linux, arm64-osx, and
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x64-windows triplets.
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2. **CMake configuration check**: `database/CMakeLists.txt` inspects the
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`unofficial::libmariadb` target's `TYPE` property at configure time and
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emits a WARNING if static linking is detected.
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3. **CI linkage verification**: The `mysql-linkage-check` CI job runs
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`ldd` (Linux) / `otool -L` (macOS) on built binaries to confirm
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dynamic linkage at build artifact level. The job fails if dynamic
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linkage cannot be verified.
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These three layers provide defense-in-depth: build-system prevention,
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configuration-time detection, and post-build verification.
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## All Dependencies (License Summary)
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| Dependency | License | Type | BSD-3 Compatible |
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| libpq (PostgreSQL) | PostgreSQL | Optional | Yes |
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| OpenSSL | Apache-2.0 | Optional | Yes |
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| SQLite | Public Domain | Optional | Yes |
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| MariaDB Connector/C | LGPL-2.1 | Optional | Yes |
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| MariaDB Connector/C | LGPL-2.1 | Optional | Yes (dynamic) |
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| mongo-cxx-driver | Apache-2.0 | Optional | Yes |
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| hiredis | BSD-3-Clause | Optional | Yes |
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| spdlog | MIT | Optional | Yes |

‎database/CMakeLists.txt‎

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target_compile_definitions(${PROJECT_NAME} PUBLIC USE_MYSQL)
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message(STATUS "MySQL support enabled (via MariaDB Connector/C, LGPL-2.1)")
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message(STATUS " libmariadb found: ${unofficial-libmariadb_FOUND}")
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# LGPL-2.1 compliance: verify libmariadb is dynamically linked.
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# Static linking of LGPL code may impose copyleft obligations on the
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# entire binary, conflicting with the project's BSD-3-Clause license.
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# Dynamic linking satisfies LGPL-2.1 automatically.
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get_target_property(_mariadb_type unofficial::libmariadb TYPE)
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if(_mariadb_type STREQUAL "STATIC_LIBRARY")
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message(WARNING
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"libmariadb is statically linked. "
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"LGPL-2.1 compliance requires dynamic linking or providing object files "
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"for re-linking. Use the custom triplet overlay in triplets/ to force "
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"shared library builds for libmariadb.")
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elseif(_mariadb_type STREQUAL "SHARED_LIBRARY")
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message(STATUS " libmariadb linking: SHARED (LGPL-2.1 compliant)")
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elseif(_mariadb_type STREQUAL "INTERFACE_LIBRARY")
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message(STATUS " libmariadb linking: INTERFACE (typically dynamic, LGPL-2.1 compliant)")
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else()
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# UNKNOWN or IMPORTED — common for vcpkg-provided targets
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message(STATUS " libmariadb linking: ${_mariadb_type} (verify dynamic linkage in CI)")
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endif()
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else()
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message(WARNING "MariaDB Connector/C not found, disabling MySQL support")
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message(STATUS " libmariadb found: ${unofficial-libmariadb_FOUND}")

‎triplets/arm64-osx.cmake‎

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# Custom triplet overlay: arm64-osx with per-port dynamic linking
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#
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# LGPL-2.1 compliance: libmariadb must be dynamically linked to avoid
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# copyleft obligations on the BSD-3-Clause project binary.
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# All other ports use static linking (default).
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set(VCPKG_TARGET_ARCHITECTURE arm64)
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set(VCPKG_CRT_LINKAGE dynamic)
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set(VCPKG_LIBRARY_LINKAGE static)
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# Force dynamic linking for LGPL-licensed ports
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if(PORT MATCHES "^libmariadb$")
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set(VCPKG_LIBRARY_LINKAGE dynamic)
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endif()
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set(VCPKG_CMAKE_SYSTEM_NAME Darwin)

‎triplets/x64-linux.cmake‎

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# Custom triplet overlay: x64-linux with per-port dynamic linking
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#
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# LGPL-2.1 compliance: libmariadb must be dynamically linked to avoid
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# copyleft obligations on the BSD-3-Clause project binary.
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# All other ports use static linking (default).
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set(VCPKG_TARGET_ARCHITECTURE x64)
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set(VCPKG_CRT_LINKAGE dynamic)
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set(VCPKG_LIBRARY_LINKAGE static)
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# Force dynamic linking for LGPL-licensed ports
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if(PORT MATCHES "^libmariadb$")
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set(VCPKG_LIBRARY_LINKAGE dynamic)
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endif()
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set(VCPKG_CMAKE_SYSTEM_NAME Linux)

‎triplets/x64-windows.cmake‎

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# Custom triplet overlay: x64-windows with per-port dynamic linking
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#
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# LGPL-2.1 compliance: libmariadb must be dynamically linked to avoid
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# copyleft obligations on the BSD-3-Clause project binary.
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# Windows defaults to dynamic linking for most vcpkg ports, but this
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# triplet ensures consistent behavior across all platforms.
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set(VCPKG_TARGET_ARCHITECTURE x64)
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set(VCPKG_CRT_LINKAGE dynamic)
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set(VCPKG_LIBRARY_LINKAGE static)
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# Force dynamic linking for LGPL-licensed ports
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if(PORT MATCHES "^libmariadb$")
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set(VCPKG_LIBRARY_LINKAGE dynamic)
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endif()

‎vcpkg-configuration.json‎

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"kind": "builtin",
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"baseline": "c4af3593e1f1aa9e14a560a09e45ea2cb0dfd74d"
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},
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"overlay-triplets": [
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"triplets"
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],
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"overrides": [
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{
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"name": "asio",

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