[arch-general] [arch-dev-public] Mkinitcpio replacement with Dracut

Eli Schwartz eschwartz at archlinux.org
Sun May 26 03:08:51 UTC 2019

On 5/25/19 1:54 AM, Neven Sajko via arch-general wrote:
> Regarding using bash as sh:
>> Bash runs POSIX scripts just fine.
> Bash does not run some POSIX scripts fine. See
> https://lists.gnu.org/archive/html/bug-bash/2017-08/msg00087.html ,
> for example. In that case an executable named ^ can not be called.

I think Chet Ramey did a pretty good explanation in the linked mailing
list about why this is a fundamental misunderstanding of what "POSIX"
means, but just to be extra sure... you are aware that POSIX defines
`command ^` as the only true, correct POSIX way to suppress shell
extensions and functions and ensure lookup as a true utility (and "^" is
not a builtin utility in bash, but if you needed to suppress those too,
enable -n ^ 2>/dev/null)? Of which there are many -- by definition,
creating a shell that has useful functionality above and beyond being a
dumb clone of the 1980s Bourne shell requires, well, adding new things
that conflict with your "unspecified functionality should do simple
$PATH lookups".

Anyway I suspect this thread is not the best place to begin a
fundamental discussion about whether GNU bash is allowed to claim it
implements POSIX. Also I doubt dracut does insane things like attempt to
invoke a utility named "^", with or without doing the POSIX thing and
disambiguating it with the use of the command utility.

Eli Schwartz
Bug Wrangler and Trusted User

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