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Re: [minor] umask 400 causes here-{doc,string} failure

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  Re: [minor] umask 400 causes here-{doc,string} failure Greg Wooledge <wooledg@eeg.ccf.org> - 2018-10-29 09:53 -0400

#14744 — Re: [minor] umask 400 causes here-{doc,string} failure

On Sun, Oct 28, 2018 at 09:30:00PM -0400, Chet Ramey wrote:
> That doesn't work for the same reason as discussed in
> http://lists.gnu.org/archive/html/bug-bash/2018-03/msg00074.html.
> It's unlikely that someone will set his umask to 400 and expect no ill
> effects, but I suppose it's better not to fail in the face of that kind
> of behavior.

I still maintain that the "umask 400" is most likely a user error.
The user probably wanted a umask that would cause all of the files to
have 0400 permissions.  Such a umask would be 0377, not 0400.

A umask that denies read permission to the owner of the file but leaves
the file world writable is simply not rational.

Bash's behavior seems acceptable to me:

wooledg:~$ bash -c 'umask 0777; cat <<< hello'
bash: cannot create temp file for here-document: Permission denied
wooledg:~$ bash-5.0-beta -c 'umask 0777; cat <<< hello'
bash-5.0-beta: cannot create temp file for here-document: Permission denied

But if you want to follow ksh's lead, I would also find that acceptable:

wooledg:~$ ksh -c 'umask 0777; cat <<< hello'
hello

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