forcemerge 436466 604993
tags 436466 + upstream
quit
Tim Connors wrote:
> 75428,46> /bin/bash -c "bash -c \"echo \\\$PPID ; ps \\\$PPID\""
Ah, I get it now. This is Bug #436466 (dash: Please optimise single
command given to -c to exec it).
It falls cleanly into the "patches welcome" category[1].
> It causes the PPid line in /proc/$pid/status to be WRONG for any program
> or script if it was executed by the system() routine provided in libc
Survey of existing behavior:
$ for shell in dash ksh93 bash mksh pdksh
> do
> $shell -c 'printf "%s " $$; bash -c "echo \$\$"'
> done
18832 18833
18834 18834
18835 18836
18837 18838
18839 18841
$ for shell in dash ksh93 bash mksh pdksh
> do
> $shell -c 'bash -c "readlink /proc/\$PPID/exe"'
> done
/bin/dash
/bin/bash
/bin/bash
/bin/mksh
/bin/pdksh
POSIX and tradition do not require the bash/ksh behavior. (See
http://austingroupbugs.net/ if you would like to change that.)
Have you tried "dpkg-reconfigure -plow dash"? That should allow your
apps to continue working...
Regards,
Jonathan
[1] If you'd like to work on this, that would be excellent. Please
feel free to email d...@vger.kernel.org with any work in progress. No
subscription required, since the convention is to always cc all
participants.
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