Conan2 Dependency repackage example

This repo showcases cpack failure when consuming conan v2 packages with transient dependencies.

All dependencies are built as shared libs.

subproject directory contains a custom conan v2 example package to reproduce the problem.

This project also allows testing this same problem on conan v1 systems, however subproject package can not be built because test_package is failing. For some reason, libEXAMPLE_REST_Utility.so can not be found, even thought it is linked in. You can see this behavior by running the following:

docker build -t conan_v1_create_failure subproject/
docker run conan_v1_create_failure

Failure reproduction

1. Create sub-project package with:

conan create subproject/ --version=0.0.0 --build=missing

2. Create build directory and change into it with:

mkdir build && cd build

3. Call conan install command and generate CMake build scripts. (Cmake internally uses conan_provider.cmake to read conanfile.txt, which tells conan what packages to download and install)

cmake -DCMAKE_BUILD_TYPE=Debug -DWITH_NANODBC=OFF -DWITH_CURL=OFF -DWITH_SUBPROJECT=ON ..

4. Build the code

cmake --build . --target all --config Debug --

5. Run the executable to make sure it works

./sources/conan2_pkg_test_Runner 

6. Try to create a simple package

cpack -G TGZ

On debian bookworm this fails to find cassandra-cpp-driver package from the subproject:

CPack: Create package using TGZ
CPack: Install projects
CPack: - Run preinstall target for: conan2_pkg_test
CPack: - Install project: conan2_pkg_test []
CMake Error at /conan2_pkg_test/build/sources/cmake_install.cmake:66 (file):
  file Could not resolve runtime dependencies:

    libcassandra.so.2
Call Stack (most recent call first):
  /conan2_pkg_test/build/cmake_install.cmake:47 (include)


CPack Error: Error when generating package: conan2_pkg_test

Same behavior can be seen when using nanodbc package. Clean the build directory with:

rm -rf build/* && cd build

and reconfigure the project to only use nanodbc package with:

cmake -DCMAKE_BUILD_TYPE=Debug -DWITH_NANODBC=ON -DWITH_CURL=OFF -DWITH_SUBPROJECT=OFF ..

Then re-run the steps 4-6 and get the following:

Pack: Create package using TGZ
CPack: Install projects
CPack: - Run preinstall target for: conan2_pkg_test
CPack: - Install project: conan2_pkg_test []
CMake Error at /conan2_pkg_test/build/sources/cmake_install.cmake:66 (file):
  file Could not resolve runtime dependencies:

    libiconv.so.2
    libltdl.so.7
Call Stack (most recent call first):
  /conan2_pkg_test/build/cmake_install.cmake:47 (include)


CPack Error: Error when generating package: conan2_pkg_test

This is really similar to how subproject transient dependencies fail to be resolved by cmake_install.cmake. nanodbc package depends on odbc package, which in turn depends on libtool and libiconv packages. libiconv.so comes from libiconv package and libltdl.so comes from libtool package.

Even stranger things happen when we try to package projects with libcurl dependency. Similar to as before Clean the build directory with:

rm -rf build/* cd build

and reconfigure the project to only use libcurl package with:

cmake -DCMAKE_BUILD_TYPE=Debug -DWITH_NANODBC=OFF -DWITH_CURL=ON -DWITH_SUBPROJECT=OFF ..

Then re-run the steps 4-6 and get the following:

CPack: Create package using TGZ
CPack: Install projects
CPack: - Run preinstall target for: conan2_pkg_test
CPack: - Install project: conan2_pkg_test []
CMake Error at /conan2_pkg_test/build/sources/cmake_install.cmake:66 (file):
  file Multiple conflicting paths found for libcrypto.so.3:

    /lib/x86_64-linux-gnu/libcrypto.so.3
    /root/.conan2/p/b/opens6b2fbd1f2b289/p/lib/libcrypto.so.3
Call Stack (most recent call first):
  /conan2_pkg_test/build/cmake_install.cmake:47 (include)


CPack Error: Error when generating package: conan2_pkg_test

For some reason, cmake sees both the libcrypto.so.3 that comes from openssl package and the one that comes from the system.

Reproducing with Docker

Build docker images with

docker build -t conan_example --build-arg CONAN_VERSION=2.0.10 --build-arg USE_NANODBC=ON --build-arg USE_CURL=ON --build-arg USE_SUBPROJECT=ON .

or to use provided defaults (conan v2.0.10, nanodbc off, curl off, subproject ON)

docker build -t conan_example .

And run it with:

docker run conan_example 

or run it in interactive mode with:

docker run -it conan_example bash