Re: [Qemu-devel] [PATCH v3 2/6] docker.py: add podman support

["Daniel P. Berrangé" <berrange@redhat.com>]

On Sat, Jul 13, 2019 at 06:33:07PM +0400, Marc-André Lureau wrote:
> Add a --engine option to select either docker, podman or auto.
> 
> Among other advantages, podman allows to run rootless & daemonless
> containers, fortunately sharing compatible CLI with docker.
> 
> With current podman, we have to use a uidmap trick in order to be able
> to rw-share the ccache directory with the container user.
> 
> With a user 1000, the default mapping is:                                                                                                                                                                         1000 (host) -> 0 (container).
> So write access to /var/tmp/ccache ends will end with permission
> denied error.
> 
> With "--uidmap 1000:0:1 --uidmap 0:1:1000", the mapping is:
> 1000 (host) -> 0 (container, 1st namespace) -> 1000 (container, 2nd namespace).
> (the rest is mumbo jumbo to avoid holes in the range of UIDs)
> 
> A future podman version may have an option such as --userns-keep-uid.
> Thanks to Debarshi Ray <rishi@redhat.com> for the help!
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Acked-by: Alex Bennée <alex.bennee@linaro.org>
> ---
>  tests/docker/docker.py | 48 +++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 43 insertions(+), 5 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
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