Matthew Heon 541252afa7 Ensure that --userns=keep-id sets user in config ...

One of the side-effects of the `--userns=keep-id` command is
switching the default user of the container to the UID of the
user running Podman (though this can still be overridden by the
`--user` flag). However, it did this by setting the UID and GID
in the OCI spec, and not by informing Libpod of its intention to
switch users via the `WithUser()` option. Because of this, a lot
of the code that should have triggered when the container ran
with a non-root user was not triggering. In the case of the issue
that this fixed, the code to remove capabilities from non-root
users was not triggering. Adjust the keep-id code to properly
inform Libpod of our intention to use a non-root user to fix
this.

Also, fix an annoying race around short-running exec sessions
where Podman would always print a warning that the exec session
had already stopped.

Fixes #9919

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

2021-04-06 09:18:46 -04:00

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