Re: linux-media checkout failing for KernelCI

[Mauro Carvalho Chehab <mchehab@kernel.org>]

Em Fri, 17 May 2024 09:45:53 -0400
Gustavo Padovan <gus@collabora.com> escreveu:

> ...linuxtv-ci mailing-list rejected me for not being a member, so moving 
> to the media list.
> 
> On 5/17/24 09:41, Gustavo Padovan wrote:
> >
> > Hi Media maintainers,
> >
> > We are struggling to use the media tree, in the same way we usually 
> > virtually all other trees in KernelCI. The following commands gives 
> > KernelCI a fatal error.
> >
> > git clone 
> > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > cd linux
> > git remote add media https://git.linuxtv.org/media_tree.git
> > git remote update media
> > git fetch --tags https://git.linuxtv.org/media_tree.git
> > fatal: Couldn't find remote ref HEAD

First of all, the best is to use, instead, media_stage.git, as this
contains the most recent patches. You should notice, however, that
we might need to rebase media_stage.git. That doesn't happen often,
but if you use it for CI, just in case, be sure that it will do a

	git reset --hard FETCH_HEAD

To avoid potential problems if a rebase is needed.

We periodically update media_tree.git as well (which never rebases),
but the update is manual. I usually do it once per week between
-rc1 to -rc7, by the time I handle myself pull requests.

For CI, the best is to use media_stage.git.

-

With regards to merge/fetch, please use the git protocol
whenever possible, e. g.:

	git://linuxtv.org/media_tree.git
	git://linuxtv.org/media_stage.git

you may, alternatively use:

	https://linuxtv.org/git/media_tree.git
	https://linuxtv.org/git/media_stage.git

The 4 above url's are handled by git daemon.

If you use, instead:

	https://git.linuxtv.org/media_tree.git

It will use cgit, which will try to do the right thing, but
results may not be consistent, as the main goal for cgit is to
provide a web visual interface (which is IMO a *lot* better than
what git??b provides).

The problem with https is that it may require a hook during
push time to update https references:

	git update-server-info

Currently, we have such hook enabled for media_tree.git and
media_stage.git. I'm not sure if this is still required for
cgit and git-daemon, though.

If one could test it, that would be nice.

We may migrate some day from git-daemon/cgit to something more modern,
like gitlab, but I'd like to keep a patch-based view like the one
provided by cgit, as IMO showing the Kernel tree by default doesn't
really help for our needs: showing the basis of the Kernel tree as
the initial view means nothing, as one can't tell if new patches were
added or not just looking into it.

> > We are in the process of enabling a lot of testing for media using 
> > fluster/gst and the ChromeOS Tast PlatformDecoder tests. I am not a 
> > git behavior expert, so we want to start this thread to discuss 
> > possible solutions as the media tree is for some reason deviating from 
> > some tacit standard.
> >
> > Thoughts?
> >
> > Best,
> >
> > - Gus
> >  
>