the GPG_TTY line in bashrc produces error message in chroot environment

"Zhang Wen" ([email protected] via blfs-dev Mailing List) <[email protected]>
Newsgroups gmane.linux.lfs.beyond.devel
Message-ID <CAKjfnjo6wc1RCgqWNXnLse3WNNfTarhn=j+n7FbyReeH=_LRdQ@mail.gmail.com> 
The root cause is while the tty command returns non-zero in the chroot
environment, the 'tty -s' command returns a zero value.
I changed 'tty -s' to 'tty > /dev/null 2>&1' and the error message
disappeared, not sure if there's a better solution.

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