conan.cmake fails when using pyenv

Issue

Hi, The conan.cmake script fails due to the conan command is not an executable. I use PyEnv on windows, so my conan command is a .bat file, or if running in Git-Bash, its a sh script.

The error I get is Conan install failed='%1 is not a valid Win32 application Here is the cmake run:

√ /c/dev/expr/conan-training/requires_conditional (shaul) $ cmake -B build -S src/
-- Building for: Visual Studio 16 2019
-- The CXX compiler identification is MSVC 19.27.29110.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Professional/VC/Tools/MSVC/14.27.29110/bin/Hostx64/x64/cl.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Conan: Using cmake-multi generator
-- Conan: Automatic detection of conan settings from cmake
-- Conan: Detected VS runtime: MD
-- Conan: Settings= -s;arch=x86_64;-s;build_type=Release;-s;compiler=Visual Studio;-s;compiler.version=16;-s;compiler.runtime=MD
-- Conan: checking conan executable
-- Conan: Found program C:/Users/sfridman/.pyenv/pyenv-win/shims/conan
-- Conan: Version found
-- Conan executing: C:/Users/sfridman/.pyenv/pyenv-win/shims/conan install . -s arch=x86_64 -s build_type=Release -s compiler=Visual Studio -s compiler.version=16 -s compiler.runtime=MD -g=cmake_multi
CMake Error at C:/dev/expr/cmake-conan/conan.cmake:455 (message):
  Conan install failed='%1 is not a valid Win32 application'
Call Stack (most recent call first):
  C:/dev/expr/cmake-conan/conan.cmake:540 (conan_cmake_install)
  CMakeLists.txt:5 (conan_cmake_run)


-- Configuring incomplete, errors occurred!
See also "C:/dev/expr/conan-training/requires_conditional/build/CMakeFiles/CMakeOutput.log".

A fix

I manage to fix the issue by running the calls to conan in a shell, like this:

set(SHELL_CONAN_CMD "cmd.exe")
set(SHELL_CONAN_ARGS "/C;${CONAN_CMD};${conan_args}")    

string (REPLACE ";" " " _conan_args "${SHELL_CONAN_ARGS}")
message(STATUS "Conan executing: ${SHELL_CONAN_CMD} ${_conan_args}")

if(ARGUMENTS_OUTPUT_QUIET)
  execute_process(COMMAND ${SHELL_CONAN_CMD} ${SHELL_CONAN_ARGS}
                   RESULT_VARIABLE return_code
                   OUTPUT_VARIABLE conan_output
                   ERROR_VARIABLE conan_output
                   WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
else()
  execute_process(COMMAND ${SHELL_CONAN_CMD} ${SHELL_CONAN_ARGS}
                   RESULT_VARIABLE return_code
                   WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
endif()

I am quite a novice in CMake, so I don’t know what will be the right way to fix this.

[czoido]

Hi @BlueSolei, Thanks a lot for reporting and proposing the fix, we’ll try to reproduce and fix the issue.

[maldag]

I opened this issue, but after using Conan for a while, I understood that the right way to go about here is to use python’s virtual environment. This way you don’t care about pyenv, as inside the virtual environment you have python.exe which works great 😃

This is not always correct since you can create a virtualenv with activated pyenv-shell. That way you can also guarantee which python version will be used for virtualenv. Virtualenv just isolates python packages, not python versions.

So using this snippet will also cause problems:

pyenv local 3.x.y
pyenv shell python -m venv. env # force creation of virtualenv with given pyenv version 3.x.y
.env\scripts\activate
# now in virtualenv
pip install -U conan
conan install ... # whatever