[mythtv-users] Mythtv build from source on Fedora 40

[James Abernathy]

On Wed, Jun 26, 2024 at 11:06 AM Gary Buhrmaster <gary.buhrmaster at gmail.com>
wrote:

> On Tue, Jun 25, 2024 at 8:52 PM James Abernathy <jfabernathy at gmail.com>
> wrote:
>
> >
> > I'm surprised by the different behavior between Fedora 40 and Ubuntu
> 24.04 with the Build from Source process.  While on F40 you get a warning,
> everything installs. But on Ubuntu 24.04 the sudo make install fails. You
> can get around it with the --break-system-packages option in the Makefile
> in the binding directory or use it as an Environment variable.  F40 must
> have different rules on this than Ubuntu.
> >
> > While I would not normally build mythtv from source on Ubuntu since the
> PPA has all the packaging done for you and it just works, I am trying to
> understand if Build from Source is out of date or if the automated Ubuntu
> package builder uses different building instructions.
> >
> > The break-system-packages override scares me a little, but if it's what
> the system packagers are doing maybe the Build from Source Wiki needs to
> include that override??
> >
>
> This is a result of PEP 668 (discussed previously on
> one/more of the MythTV threads).  Ubuntu/Debian
> "enforces" the requirement that you don't (potentially)
> break system packages, and Fedora has decided to
> not "enforce" that you don't (potentially) break system
> packages.  In either case you can install into a
> virtual environment without issue (although virtual
> environments have different implications).
>
> If one builds a package (rather than manual
> build/install) installing the resulting package into
> the system libraries typically works fine (as
> the build process and the system expects
> packages to install into the system library
> space), and as an added (important) benefit,
> using packages tends to make it easier to insure
> that the resulting environment is properly set up.
> I always build/install/remove via packages (but I
> also have my own build recipes).  I believe the
> mythtv/packaging scripts (in the repo) for
> Ubuntu properly support PEP 668 (and others).
>
> If the wiki needs to be updated based on your
> experience, please do so.
>

Thank you for the details.   This explains why I'm seeing no issues with
Fedora 40 builds of mythtv but I am seeing the PEP 668 warning when
building mythtv on Ubuntu. I'm bothered by circumventing any security
protection unless I completely understand it, and I don't understand
anything about how I could build mythtv from source and install it into a
proper virtual environment.

As I mentioned this is an education for me and not a real problem. On
Ubuntu systems I install mythtv using the ppa and that works great.  On
Debian the mythtv wiki's instructions work for me if I just update them for
v34.  Even the AUR mythtv-git works fine on Archlinux based distros.

If you could point me to the mythtv/packaging location where the proper
handling of PEP 668 is done, I'd be grateful.

Thanks again for taking the time to help with my education on this.  There
seem to be a lot of people out there on the internet struggling with this
issue on a whole lot of different python programs that now require fixes.
Most are just using the break system packages method which I don't think is
the best way.

Jim A
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