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From: Bruce Momjian <bruce@momjian.us>
To: Wolfgang Walther <walther@technowledgy.de>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: peter@eisentraut.org, Christophe Pettus <xof@thebuild.com>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: PostgreSQL Bugs <pgsql-bugs@lists.postgresql.org>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Subject: Re: Regression tests fail with musl libc because libpq.so can't be loaded
Date: Wed, 20 Mar 2024 15:18:39 -0400
Message-ID: <Zfs2j9mZEsiA1fRe@momjian.us> (raw)
In-Reply-To: <1d11d75a-89cf-4e75-9c39-76bef37fc029@technowledgy.de>
References: <ZfolyUQw9z1zxX58@momjian.us>
	<CA+hUKG+Y1D2Bv9v0GbYrhiQ+mhf=6Xj2_viiATnBVFShkfO4VQ@mail.gmail.com>
	<4093813.1710899588@sss.pgh.pa.us>
	<CA+hUKGKNK5V8XwwJJZm36s3EUy8V51xu4XiE8=26n=Wq3OGd4A@mail.gmail.com>
	<4095435.1710900216@sss.pgh.pa.us>
	<CA+hUKGK2cSx3dveMqBD+E9N=zJ0WawBcbk_jnPqmdWBM0DT_3Q@mail.gmail.com>
	<477fa513-6bf0-456d-8d24-1e22a19df671@technowledgy.de>
	<ZfrmN4WHuJgD95fw@momjian.us>
	<ZfrmmtMRLN6svkvv@momjian.us>
	<1d11d75a-89cf-4e75-9c39-76bef37fc029@technowledgy.de>

On Wed, Mar 20, 2024 at 03:24:58PM +0100, Wolfgang Walther wrote:
> Bruce Momjian:
> > I guess we could conditionally exec only if we find we must, but then
> > such exec cases would be rare and rarely tested.
> 
> I think you might be seriously underestimating how often musl is used.
> Alpine Linux uses musl and is very widespread in the container world because
> of smaller image size.
> 
> The library/postgres docker image has been pulled about 8 billion times
> since 2014 [1]. While we can't really tell how many of those pulled the
> alpine variant of the image, comparing the alpine [2] and ubuntu/debian
> [3,4] base images gives a rough estimate of >50% using alpine in general.

Uh, what is the current behavior of Postgres on musl?  It just fails if
the process title is longer than argv[0] plus the environment space to
the LD_ environment variable, and then linking fails for certain
extensions?  If there are many downloads, why would we only be getting
this report now?

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Only you can decide what is important to you.





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  Subject: Re: Regression tests fail with musl libc because libpq.so can't be loaded
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