From: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Date: Fri, 21 Oct 2016 03:41:21 +0000 (-0400)
Subject: detect-virt: add --private-users switch to check if a userns is active
X-Git-Tag: v232.2~23
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=70cec624a0e54f3c35aff781645b07452fc32596;hp=70cec624a0e54f3c35aff781645b07452fc32596

detect-virt: add --private-users switch to check if a userns is active

Various things don't work when we're running in a user namespace, but it's
pretty hard to reliably detect if that is true.

A function is added which looks at /proc/self/uid_map and returns false
if the default "0 0 UINT32_MAX" is found, and true if it finds anything else.
This misses the case where an 1:1 mapping with the full range was used, but
I don't know how to distinguish this case.

'elogind-detect-virt --private-users' is very similar to
'elogind-detect-virt --chroot', but we check for a user namespace instead.
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