Map usernames not allowed by useradd to the fallbackUser "lima" #243
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This PR expands on #214.
The
useradd
utility uses a more restrictive pattern than the containerdidentifiers.Validate()
function: https://github.com/shadow-maint/shadow/blob/26bbee8/libmisc/chkname.c#L51-L78Also a fully numeric username seems to break systemd/cloud-init, as
/run/user/$UID/systemd/private
is never created.Note that this PR will also disallow the
firstname.lastname
usernames.Fixes #235