Not sure I understand your script nesting problem, but as for sudo, the environment variable SUDO_USER (set by sudo to who called sudo) might help. 

$ sudo -u nobody perl -E 'say scalar getpwuid $>; say $ENV{SUDO_USER}'
nobody
eliya

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In reply to Re: Obtaining userid from script called by sudo and other scripts by Eliya
in thread Obtaining userid from script called by sudo and other scripts by njetson

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