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run: ignore PODMAN_USERNS with --pod

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the combination --pod and --userns is already blocked.  Ignore the
PODMAN_USERNS variable when a pod is used, since it would cause to
create a new user namespace for the container.

Ideally a container should be able to do that, but its user namespace
must be a child of the pod user namespace, not a sibling.  Since
nested user namespaces are not allowed in the OCI runtime specs,
disallow this case, since the end result is just confusing for the
user.

Closes: https://github.com/containers/podman/issues/18580

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano
2023-05-17 13:02:34 +02:00
parent a1201843fd
commit 192ad70e98
3 changed files with 9 additions and 4 deletions
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docs/source/markdown/options/userns.container.md
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@ -4,7 +4,7 @@
####> are applicable to all of those.
#### **--userns**=*mode*
Set the user namespace mode for the container. It defaults to the **PODMAN_USERNS** environment variable. An empty value ("") means user namespaces are disabled unless an explicit mapping is set with the **--uidmap** and **--gidmap** options.
Set the user namespace mode for the container. It defaults to the **PODMAN_USERNS** environment variable unless `--pod` is specified. An empty value ("") means user namespaces are disabled unless an explicit mapping is set with the **--uidmap** and **--gidmap** options.
This option is incompatible with **--gidmap**, **--uidmap**, **--subuidname** and **--subgidname**.