[mythtv] cmake build

[Peter Bennett]

On 1/23/25 12:30, Roland Ernst wrote:
>
> On Thu, Jan 23, 2025 at 6:05 PM Peter Bennett <pb.mythtv at gmail.com> wrote:
>
>
>     On 1/23/25 11:39, David Hampton wrote:
>>>     Command Line::
>>>
>>>     cmake --preset qt5 \
>>>     -DMYTH_BUILD_PLUGINS=OFF \
>>>     -DCMAKE_INSTALL_PREFIX=/home/peter/proj/build/noble-
>>>     amd64/mythtv/cmake/usr \
>>>>     & tee ../cmake1.log
>>>     cmake --build build-qt5 |& tee ../cmake2.log
>>>
>>>     Result:
>>>
>>>     error: externally-managed-environment
>>>
>>>     × This environment is externally managed
>>>     ╰─> To install Python packages system-wide, try apt install
>>>           python3-xyz, where xyz is the package you are trying to
>>>           install.
>>>
>>>           If you wish to install a non-Debian-packaged Python package,
>>>           create a virtual environment using python3 -m venv path/to/venv.
>>>           Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
>>>           sure you have python3-full installed.
>>>
>>>           If you wish to install a non-Debian packaged Python application,
>>>           it may be easiest to use pipx install xyz, which will manage a
>>>           virtual environment for you. Make sure you have pipx installed.
>>>
>>>           See /usr/share/doc/python3.12/README.venv for more information.
>>>
>>>     note: If you believe this is a mistake, please contact your Python
>>>     installation or OS distribution provider. You can override this, at
>>>     the
>>>     risk of breaking your Python installation or OS, by passing
>>>     --break-system-packages.
>>>     hint: See PEP 668 for the detailed specification.
>>>     [3/3] Completed 'MythTV'
>>     I don't see this warning when compiling on my debian 12 or ubuntu 24.04
>>     test systems.   The former is using the setup.py method, and the later
>>     is using the pip method.  Which python setup method is your system
>>     using?  Grep your logfile for the string 'Using python':
>>
>>          grep -B 1 'Using python' <logfile>
>     peter at framework:~/proj/github.com/MythTV$ grep -B 1 'Using python'
>     cmake2.log
>     -- Python pip install not available (missing module(s): wheel)
>     -- Using python setup.py install method
>
>>>     To fix this I installed a local python environment, and I had to
>>>     install
>>>     setuptools:
>>>
>>>     sudo apt install python3-venv
>>>     # Create virtual environment directory
>>>     python3 -m venv python
>>>     # Activate the environment by sourcing the activate script in the
>>>     environment directory
>>>     source ~/python/bin/activate
>>>     # Install packages in to the environment directory
>>>     pip3 install setuptools
>>>
>>>     After this it built and installed successfully, and I tested it.
>>     Something is wrong.  You shouldn't have to build in a venv.
>>
>     Maybe i need module "wheel"
>
>     Peter
>
>
> Peter,
> on Ubuntu you need the package "python3-pip" ('apt install python3-pip')
> That installs the module "wheel" as dependency.
> On other OS-Distributions, one may need to install "wheel" separately.
> This is handled by mythtv/ansible in a correct way.
> Do not try to install pip, wheel in any other way!
>
> Roland

Something seems to be messed up. I checked with dpkg --list. I do have 
python3-pip and python3-wheel installed already. If i run "pip install" 
I get the long message

error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
     python3-xyz, where xyz is the package you are trying to
     install.
..... another several lines suggesting I setup a venv

So why is the cmake build giving that message? It seems cmake is trying 
to run "pip install" but that is not allowed.

If I use the venv I do not have wheel installed, that is why if I use 
venv it uses setup.py and then tells me that is deprecated.

Peter


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