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Re: [Qemu-devel] [PATCH v2 2/5] tests/docker: add podman support

From: Debarshi Ray
Subject: Re: [Qemu-devel] [PATCH v2 2/5] tests/docker: add podman support
Date: Wed, 17 Jul 2019 17:17:54 +0200


Sorry for the late response. I was on vacation and away from my keyboard.

On Tue, Jul 9, 2019 at 9:44 PM Marc-André Lureau
<address@hidden> wrote:
> 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.

The future is here! :)

Since Podman 1.4.0, released on 7th June 2019, you can use
--userns=keep-id instead of typing out the entire UID mapping. The
relevant Podman pull request is:


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