[libcamera-devel] [PATCH] Add alternative meson install command

[Sebastian Fricke]

Hey Verdant & Nicolas,

On 22.03.2021 15:22, Nicolas Dufresne wrote:
>Le lundi 22 mars 2021 à 15:35 +0530, Vedant Paranjape a écrit :
>> Changelog:
>>
>> * Updated README.rst to describ meson install issue
>>
>> While installing meson using pip3 install --user meson, due to python path
>> issues, build.ninja can't be located by ninja.
>> It gives the following error on ninja -C build install:
>
>This is very vague. I was told on IRC that the error you have hit is when you
>used "meson install" in order to install libcamera system wide. This this
>context it can fail in two ways:
>
>1) policy kit removes some of your environment which cause the local python
>module to be lost, and then system meson endup being used
>2) sudo does not respect your user path, which is likely set in .bashrc, hence
>the environment is lost, and you endup using your system meson
>
>Perhaps what you want to do is to add a "Trouble Shooting" section, and have

I like this idea, I believe that the installation section should be as
small as possible and centered around the general use-case (where
everything works as described). If we add to many special cases into
that section, then it will become unreadable. A "Trouble Shooting"
section would work like a little FAQ, which would probably reduce the
amount of newbie questions focused around the installation.

Greetings,
Sebastian

>more precise explanation on which feature may wait and what workaround may be
>used. This is in my opinion a very niche use case. It's also not something I
>would recommend to use as development work-flow. libcamera source code is
>designed to be run in-place for development purpose, and installing should be
>used to make packages or your distribution instead.
>
>>
>> ninja: Entering directory `build'
>> ninja: error: loading 'build.ninja': No such file or directory
>>
>> After uninstalling meson and installing it without --user argument solved the
>> issue.
>>
>> Signed-off-by: Vedant Paranjape <vedantparanjape160201 at gmail.com>
>> ---
>>  README.rst | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/README.rst b/README.rst
>> index 1427c714..b86bcc1d 100644
>> --- a/README.rst
>> +++ b/README.rst
>> @@ -37,6 +37,13 @@ To fetch the sources, build and install:
>>    meson build
>>    ninja -C build install
>>  
>> +Several users have reported issues with meson installation, crux of the issue
>> is a potential version
>> +mismatch between the version that is installed in root, and version that the
>> normal user
>> +uses. On calling meson, it can't find the build.ninja module. This can be
>> solved by two ways:
>> +
>> +1) Don't install meson again if it is already installed system-wide
>> +2) If you still went ahead and installed, uninstall meson using pip, and
>> install again without --user argument
>> +
>>  Dependencies
>>  ~~~~~~~~~~~~
>>  
>
>
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