[libcamera-devel] [PATCH v7] Add alternative meson install command

[paul.elder at ideasonboard.com]

Hi Vedant,

On Tue, Mar 30, 2021 at 08:09:23PM +0530, Vedant Paranjape wrote:
> While installing meson using pip3 install --user meson, due to python
> path issues, build.ninja can't be located by ninja. meson generates
> ninja files fine, but then when you run ninja, it is unable to find
> meson's build.ninja python module due to path issues.
> It gives the following error on ninja -C build install:
> 
> ninja: Entering directory `build'
> ninja: error: loading 'build.ninja': No such file or directory
> 
> After uninstalling meson using pip3 and installing it again using pip
> without --user argument solved the issue.
> 
> Signed-off-by: Vedant Paranjape <vedantparanjape160201 at gmail.com>
> ---
> Changes in v7:
> * Updated README.rst to describe meson install issue
> * Removed "changelog" heading from commit message
> * Fixed few grammatical mistakes
> * Reworded few sentences
> * Added a new troubleshooting section in readme, and shifted meson issue 
> to that section
> * Fixed line width issues and some grammatical mistakes
> 
>  README.rst | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/README.rst b/README.rst
> index 1427c714..d46109c8 100644
> --- a/README.rst
> +++ b/README.rst
> @@ -104,3 +104,31 @@ onto the default video display element on your system.
>    gst-launch-1.0 libcamerasrc camera-name="Camera 1" ! videoconvert ! autovideosink
>  
>  .. section-end-getting-started
> +
> +Troubleshooting
> +~~~~~~~~~~~~~~~
> +
> +Several users have reported issues with meson installation, crux of the issue
> +is a potential version mismatch between the version that root uses, and the
> +version that the normal user uses. On calling `ninja -C build`, it can't find
> +the build.ninja module. This the snippet of error message,

s/This the snippet of error message,/This is a snippet of the error message:/

> +
> +:: 
> +
> +  ninja: Entering directory `build'     
> +  ninja: error: loading 'build.ninja': No such file or directory
> +
> +This can be solved in two ways: 
> +
> +1) Don't install meson again if it is already installed system-wide. 2) If a

2) should be on a new line.

> +version of meson which is different from the system-wide version is already
> +installed, uninstall that meson using pip3, and install again without the
> +--user argument.
> +
> +Solution to this was installing meson as root, this is not ideal, and should be
> +done as a last resort

You already provide a solution above, so what is this a solution to?

I'm not sure this (and the below) section is necessary.

> +
> +::
> +
> +  sudo pip3 install meson
> +
> -- 
> 2.25.1

Almost there!


Paul