Re: [BUG] Illegal function names are accepted after being used as aliases

[Eric Blake <eblake@redhat.com>]

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On 02/23/2016 11:44 AM, Harald van Dijk wrote:

> This matches bash's behaviour, aside from bash requiring -- to prevent
> detection of invalid flags to the alias command:
> 
> bash-4.3$ alias -- -=true

Then dash DOES have a bug:

# dash
$ alias -- -='echo hi'
alias: -- not found
$ echo $?
1
$ -
hi
$

POSIX XCU 1.4 is clear:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap01.html

"Default Behavior: When this section is listed as "None.", it means that
the implementation need not support any options. Standard utilities that
do not accept options, but that do accept operands, shall recognize "--"
as a first argument to be discarded."

and alias takes operands, stating "OPTIONS: None.", which means POSIX
_requires_ 'alias -- -=name' to (attempt to) define only the single
alias '-', and NOT to also attempt to define '--' as an alias.

It's okay if dash allows 'alias -=blah' to define '-' as an alias as an
extension, but it MUST ignore '--' the way bash does.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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