Re: [Buildroot] [PATCH RFC 2/2] utils/docker-run: mount the download directory if specified

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello,

On Tue, 8 Aug 2023 22:50:47 +0200
"Yann E. MORIN" <yann.morin.1998@free.fr> wrote:

> So, I guess your issue is that /dl does not exist in the container, so
> it is created by the docker runtime and thus group-belongs to docker,
> and the SELinux labelling means that everything beneath it also belongs
> to docker.
> 
> Also:
> 
> * what about files that already existed before: are the chgrp-ed to
>   docker, or do they retain their group?

Folders in /dl that existed before in the BR2_DL_DIR on my "host" look
like this outside the container:

$ ls -l ~/dl/xz
drwxr-xr-x. 2 thomas thomas 4096  6 août  00:05 /home/thomas/dl/xz

and inside the container:

$ ./utils/docker-run ls -ld /dl/xz
drwxr-xr-x. 2 br-user br-user 4096 Aug  5 22:05 /dl/xz

> * and from within the container, whom do the files belong to?

The files downloaded in /dl from within the container (by running a
Buildroot build in the container, that causes some downloads to take
place). They appear outside the container as such:

$ ls -ld ~/dl/swig
drwxr-xr-x. 2 thomas docker 4096 26 juil. 23:00 /home/thomas/dl/swig/

And within the container they appear as such:

$ ./utils/docker-run ls -ld /dl/swig
drwxr-xr-x. 2 br-user 976 4096 Jul 26 21:00 /dl/swig

Inside the container, the /dl directory itself is owned by
br-user:br-user:

$ ./utils/docker-run ls -ld /dl
drwxr-xr-x. 276 br-user br-user 12288 Aug  8 21:18 /dl

Does that answer your question?

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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