Devuan bug report logs - #697
/etc/default/grub.d/xen.cfg: Extraneous output line causes error message at boot

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From: "Devuan bug Tracking System" <owner@bugs.devuan.org>
To: "John E. Krokes" <mag@netherworld.org>
Subject: bug#697 closed by Mark Hindley <mark@hindley.org.uk> (Fixed in
 Debian #1016547)
Message-ID: <handler.697.D697.16734317422268.notifdone@bugs.devuan.org>
References: <Y76Km/tYgjikJw4H@hindley.org.uk>
 <165938651342.16705.8672993380929509725.reportbug@decay.netherworld.org>
X-Devuan-PR-Message: they-closed 697
X-Devuan-PR-Package: xen-hypervisor-common
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Reply-To: 697@bugs.devuan.org
Date: Wed, 11 Jan 2023 10:10:05 +0000
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This is an automatic notification regarding your bug report
which was filed against the xen-hypervisor-common package:

#697: /etc/default/grub.d/xen.cfg: Extraneous output line causes error message at boot

It has been closed by Mark Hindley <mark@hindley.org.uk>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Mark Hindley <mark@hindley.org.uk> by
replying to this email.


-- 
697: https://bugs.devuan.org/cgi/bugreport.cgi?bug=697
Devuan Bug Tracking System
Contact owner@bugs.devuan.org with problems

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From: Mark Hindley <mark@hindley.org.uk>

To: 697-done@bugs.devuan.org

Subject: Fixed in Debian #1016547

Date: Wed, 11 Jan 2023 10:08:27 +0000

Version: 4.16.2-1

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From: "John E. Krokes" <mag@netherworld.org>

To: Devuan Bug Tracking System <submit@bugs.devuan.org>

Subject: /etc/default/grub.d/xen.cfg: Extraneous output line causes error message at boot

Date: Mon, 01 Aug 2022 16:41:53 -0400

Package: xen-hypervisor-common
Version: 4.14.5+24-g87d90d511c-1
Severity: minor
File: /etc/default/grub.d/xen.cfg

Dear Maintainer,

When invoked via grub-mkconfig, xen.cfg outputs this as its first line:
        Including Xen overrides from /etc/default/grub.d/xen.cfg

The output of grub-mkconfig is expected to be redirected into a grub.cfg file.
Grub will read the grub.cfg at boot. Unfortunately, "Including" is not a
valid grub command. So when booting, grub emits this error message before
displaying its menu:
	error: can't find command `Including'.


The error message is obscured very quickly. It does not affect functionality
in any way. It requires booting on a VERY slow machine in order to read
the error message at all.


If I add a '#' to the start of the "Including", the resulting grub config file
boots with no error.
	echo "#Including Xen overrides from /etc/default/grub.d/xen.cfg"


I'm not sure if this line was intended to go into the generated config
file as a comment, or if it was intended to be shown to the user while
grub-mkconfig is running.


I have observed this and tested my fix against version
4.14.5+24-g87d90d511c-1 of xen-hypervisor-common. I have also checked
with the debian git at https://salsa.debian.org/xen-team/debian-xen/-/blob/master/debian/tree/xen-hypervisor-common/etc/default/grub.d/xen.cfg. This line
has not changed in a very long time.


I can also duplicate the behavior using grub-emu, with the output redirected
to a file.



Thanks for your time.

-Mag


-- System Information:
Distributor ID:	Devuan
Description:	Devuan GNU/Linux 4 (chimaera)
Release:	4
Codename:	chimaera
Architecture: x86_64

Kernel: Linux 5.10.0-16-amd64 (SMP w/2 CPU threads)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
LSM: AppArmor: enabled

-- Configuration Files:
/etc/default/grub.d/xen.cfg changed:
echo "Including Xen overrides from /etc/default/grub.d/xen.cfg"
XEN_OVERRIDE_GRUB_DEFAULT=0
if [ "$XEN_OVERRIDE_GRUB_DEFAULT" = "" ]; then
	echo "WARNING: GRUB_DEFAULT changed to boot into Xen by default!"
	echo "         Edit /etc/default/grub.d/xen.cfg to avoid this warning."
	XEN_OVERRIDE_GRUB_DEFAULT=1
fi
if [ "$XEN_OVERRIDE_GRUB_DEFAULT" = "1" ]; then
	GRUB_DEFAULT=$( \
		printf "$(gettext "%s, with Xen hypervisor")" \
		"$GRUB_DISTRIBUTOR GNU/Linux")
fi


-- no debconf information

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