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Re: Sourcing a script from a pipe is not reliable


From: Jeremy
Subject: Re: Sourcing a script from a pipe is not reliable
Date: Thu, 10 Jan 2019 15:28:02 -0800

A more reliable way to demonstrate the bug:

cat <(echo echo '$1' 2)  | . /dev/stdin yes

Should output "yes 2", and does in bash 4.4.23, but in
bash 3.2.57(1)-release it outputs nothing: the output of cat does not get
sourced.

Reminder, I'm seeking a workaround rather than a patch, to reliably test if
the current shell supports passing positional parameters to a sourced
script, without creating a temporary file.

On Wed, Jan 9, 2019 at 8:11 PM Jeremy <address@hidden> wrote:

> Configuration Information [Automatically generated, do not change]:
>
> Machine: Mac
>
> OS: Darwin
>
> Compiler: gcc
>
> Compilation CFLAGS: Xcode
>
> uname output: Darwin Octo.local 15.6.0 Darwin Kernel Version 15.6.0: Thu
> Jun 21\
>
>  20:07:40 PDT 2018; root:xnu-3248.73.11~1/RELEASE_X86_64 x86_64
>
> Machine Type: x86_64-Apple-Darwin
>
>
> Bash Version: 3.2
>
> Patch Level: 48
>
> Release Status: relase
>
>
> Although bashbug listed the Patch Level as 48 (and misspelled "release")
> the version string is
>
> 3.2.57(1)-release (x86_64-apple-darwin15)
>
>
> This is on MacOS 10.11.6. If there is a better place for me to report this
> bug, please let me know.
>
> Description:
>
> Sourcing a script from a pipe is not reliable.
>
>
> Repeat-By:
>
> This command line should run forever:
>
>
>   i=0; while [ "_$(echo echo '$1' | . /dev/stdin yes)" = "_yes" ]; \
>
>   do echo -n .; ((i++)); done; printf "\n%s\n" $i
>
>
> When I run it, it usually terminates with $i much less than 1,000.
>


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