[bug] coreutils: potentially dangerous: $(realpath //) != /

[Achim Gratz]

Mikhail Usenko via cygwin writes:
> coreutils-8.26-2
> cygwin-2.10.0-1
>
> Test case 1:
> -------------------
> $ realpath //
> //
> -------------------
> Expected output: /

Adjust your expectations, a double slash at the beginning signifies a
network path (as expressedly allowed for in POSIX) and can't be
simplified.

> Test case 2:
> -------------------
> $ MYDIR=//
> $ test "$(realpath -e "$MYDIR" )" != /  &&  echo rm -rf "$MYDIR"/*
> rm -rf ///bin ///cygdrive ///Cygwin.bat ///Cygwin.ico ///Cygwin-Terminal.ico ///dev ///etc ///home ///lib ///proc ///sbin ///tmp ///usr ///var
> -------------------
> Expected output: no output

This goes to show that you really, really, really want to understand the corner
cases in this script.


Regards,
Achim.
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