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Message-ID: <20181226122917.GD21289@port70.net>
Date: Wed, 26 Dec 2018 13:29:17 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Cc: Philippe Grégoire <pg@...egoire.xyz>
Subject: Re: getspnam: errno=ENOENT for absent user
* Philippe Grégoire <pg@...egoire.xyz> [2018-12-25 17:07:14 -0500]:
> I'm working with saltstack on Alpine Linux and am getting trouble
> managing users. I tracked the problem down to musl and the fact
> that getspnam sets errno to ENOENT when a user is missing. This
> behavior differs from glibc which leaves errno to 0 and makes
> the user relies on the return value; when the name is missing.
>
> Semantically, ENOENT makes sense, but this is breaking compatibility
> with other softwares, at the moment. I'll send a patch over to
> saltstack so that current systems are supported, but believe it
> should be fixed here too for future compatibility. What do you think?
based on
http://pubs.opengroup.org/onlinepubs/9699919799/functions/getpwnam.html
"If the requested entry was not found, errno shall not be changed."
this should be fixed in musl.
>
> Please, Cc me for reply as I'm not subscribed.
>
>
> Program to demonstrate the issue:
>
> #include <errno.h>
> #include <shadow.h>
> #include <stdio.h>
> int main(void)
> {
> errno = 0;
> void* r = getspnam("enoent);
> perror("getspnam");
> printf("%p\n", r);
> }
>
> On Debian:
> getspnam: Success
> (nil)
>
> On Alpine:
> getspnam: No such file or directory
> 0
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