asterisk variables in FAI debug mode

[Martin Krämer]

Dear all,

is there a way I can make custom variables not readable in FAI.log like the
ROOTPW variable?

For example I am using two variables BIOSPW & LUKSPW to define my default
BIOS password and default LUKS password.
Unfortunately they are shown as clear text in FAI.log if verbose is defined
as fai flag.

I know it is not the most secure way to define password variables, but for
my current usecase it is good enough.

Thank you for hints.
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