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It might be blocked through /proc/PID/setgroups
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This adds a new call get_user_creds_clean(), which is just like
get_user_creds() but returns NULL in the home/shell parameters if they contain
no useful information. This code previously lived in execute.c, but by
generalizing this we can reuse it in run.c.
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Dynamic users should be treated like system users, and their logs
should end up in the main system journal.
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This way we can reuse them for validating User=/Group= settings in unit files
(to be added in a later commit).
Also, add some tests for them.
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With this change -U will turn on user namespacing only if the kernel actually
supports it and otherwise gracefully degrade to non-userns mode.
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This should be handled fine now by .dir-locals.el, so need to carry that
stuff in every file.
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This is a continuation of the previous include sort patch, which
only sorted for .c files.
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Also, rename it take_etc_passwd_lock(), in order to make it more
expressive.
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So far we had two pretty much identical calls in user-util.[ch]:
lookup_uid() and uid_to_name(). Get rid of the former, in favour of the
latter, and while we are at it, rewrite it, to use getpwuid_r()
correctly, inside an allocation loop, as POSIX intended.
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