Daan De Meyer
cfd2f7c73e
namespace_enter() tried to become root after joining a user namespace but ignored failures, so if root wasn't mapped we'd just carry on with our original UID/GID. Let's make that an error instead. Dropping supplementary groups stays best effort, as setgroups() might be denied (e.g. by the nsresourced BPF LSM) even when root is mapped. Some callers do need to enter namespaces without root, so add NAMESPACE_ENTER_KEEP_UID_GID_IF_ROOT_UNMAPPED for those. It's used by systemd-analyze unit-shell and by the credential refresh in the user manager. Everything else enters containers or namespaces we allocated ourselves, where root is always mapped.
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