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Subject: Re: [ANNOUNCEMENT] Updated: bash-4.3.39-2
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References: <announce DOT 556EF85C DOT 3000809 AT redhat DOT com> <20150604125154 DOT 712cbb6af2fc96c5a2306494 AT nm DOT ru> <560466C1 DOT 20709 AT redhat DOT com> <20150928173032 DOT f0a3253c068c27c077a0e18d AT inbox DOT ru>
From: Eric Blake <eblake AT redhat DOT com>
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Date: Mon, 28 Sep 2015 08:56:14 -0600
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On 09/28/2015 08:30 AM, Mikhail Usenko wrote:

> But catching that bug (in upstream?) hasn't changed anything
> at least on my installation:

Okay, so it sounds like your issue is separate.

>=20
> ---%<---<cygwin-test.sh>---%<---
> #! /bin/bash
> bash -version | head -n1
> echo
>=20
> sender()
> {
>   echo -n  '\r\n' >&2
>   echo -ne '\r\n'

'echo -n' and 'echo -e' are non-portable (even in bash; because I can
use 'shopt -s xpgecho' to get POSIX-mandated behavior).  Use 'printf'
instead.


> receiver()
> {
>   t=3D""
>   while read t || [ "$t" ]; do
>     echo -ne ": \t"
>     od -A n -t x1  <<<"$t"
>   done  >&2
> }
>=20
>=20
> # implicit pipe
> receiver < <(sender)
>=20
> # explicit pipeline
> sender | receiver

Okay, I can see the disappearing \r even on a binary mount, so it
appears to be unrelated to the fix for text mounts.

Meanwhile, doing something like this (with a shorter sender):

# sender | od -An -tx1
\r\n\r\r\n\r\r\r\n 0d 0a 0d 0d 0a 0d 0d 0d 0a

shows that the pipeline is not eating the \r, but rather it appears to
be an issue in 'read'.  I'm still investigating, but thanks for the
recipe, as it gives me something to focus on.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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