Re: bash 5.2 bad substitution for ${x:+${x}[}

[Chet Ramey]

On 10/20/22 5:03 AM, Martin von Gagern wrote:

> Bash Version: 5.2
> Patch Level: !PATCHLEVEL!
> Release Status: release
>
> Description:
>
> Some substitutions that used to work pre 5.2 are failing starting in
> 5.2. I did a git bisect on that, it's the initial 5.2 commit which
> broke this, 
> https://git.savannah.gnu.org/cgit/bash.git/commit/?h=bash-5.2&id=74091dd4e8086db518b30df7f222691524469998.
>
> According to my reproducing example below, this appears to be due to a
> combination of conditional substitution, a variable enclosed in curly
> braces and an unbalanced opening square bracket that I think should
> only be considered as text without any semantic relevance in this
> position.

Thanks for the report. This came up a couple weeks ago in

https://lists.gnu.org/archive/html/bug-bash/2022-10/msg00022.html

and is fixed in the devel branch. I've attached the patch that fixes it.

Chet

--
``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/

nested-brace-expansion.patch
Description: Text document