Re: bash 5.1 heredoc pipes problematic, shopt needed

[Chet Ramey]

On 4/22/22 9:51 AM, Sam Liddicott wrote:

> Bash Version: 5.1
> Patch Level: 16
> Release Status: release
>
> Description:
>          Listed in the changes:
>          c. Here documents and here strings now use pipes for the expanded
>             document if it's smaller than the pipe buffer size, reverting
>             to temporary files if it's larger.

OK. Keep in mind this is already 18 months old, and that bash-5.2 is in
beta.

>          This causes problems with many programs suffering from the TOCTOU
>          bug of checking whether or not the input is actually a file
>          instead of just using it as one.

This seems like something that is perfectly suited for compatibility mode.
The shell options aren't intended to expose internal implementation
choices.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/