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Re: [PATCH] resolv/resolv.h: allow alternative resolv.conf files

• From: Carlos O'Donell <carlos at redhat dot com>
• To: Renzo Davoli <renzo at cs dot unibo dot it>, Zack Weinberg <zackw at panix dot com>
• Cc: Florian Weimer <fweimer at redhat dot com>, GNU C Library <libc-alpha at sourceware dot org>
• Date: Thu, 17 Aug 2017 11:20:53 -0400
• Subject: Re: [PATCH] resolv/resolv.h: allow alternative resolv.conf files
• Authentication-results: sourceware.org; auth=none
• References: <20170817115013.sepjn4aqfi3dlwje@cs.unibo.it> <4c0746d6-8952-ccf5-4184-87cc9be17ddc@redhat.com> <CAKCAbMhMkyZoWEQgU+wD6ZyS_HT1RGatDUA_n39rQ2VqZJpTSA@mail.gmail.com> <20170817135853.lmqv52fmts3fdblr@cs.unibo.it> <20170817143231.6cafq26aqlhvcazi@cs.unibo.it>

On 08/17/2017 10:32 AM, Renzo Davoli wrote:>> _PATH_RESCONF really has to be a string literal, and you can't use a GNU>> C extension in such a way in an installed header file.>>>> The environment variable would have to be ignored in AT_SECURE mode, so>> you have to use __libc_secure_getenv or put it into unsecvars.h.> > Here is a different implementation:> * it does not use any gcc extension> * use __libc_secure_getenv instead of getenv> * do not change installed header files.You ask:"Why to obtain a so simple feature should I have to overlay mount /etc?"and the answer is:* It complicates the glibc design when an overlay mount already exists.* Environment variables are brittle and may be cleared in certain  or unused in certain circumstances.The most robust solution is an overlay mount in /etc.Is there anything technically wrong with the overlay mount?The overlay mount is semantically clearer than another env var thatchanges existing behaviour.-- Cheers,Carlos.

• Follow-Ups:
  • Re: [PATCH] resolv/resolv.h: allow alternative resolv.conf files
    • From: Renzo Davoli

• References:
  • [PATCH] resolv/resolv.h: allow alternative resolv.conf files
    • From: Renzo Davoli
  • Re: [PATCH] resolv/resolv.h: allow alternative resolv.conf files
    • From: Florian Weimer
  • Re: [PATCH] resolv/resolv.h: allow alternative resolv.conf files
    • From: Zack Weinberg
  • Re: [PATCH] resolv/resolv.h: allow alternative resolv.conf files
    • From: Renzo Davoli
  • Re: [PATCH] resolv/resolv.h: allow alternative resolv.conf files
    • From: Renzo Davoli