Aw: Re: grub search - reboot ?

[devzero]

> Why do you think it is related to this command? Add some delay and debug
> print to make sure where exactly it reboots.

this is the entry from grub.conf

menuentry 'CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)' --class centos 
--class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 
'gnulinux-3.10.0-327.el7.x86_64-advanced-e6d48e3e-10ba-415b-91d0-87a0bb295a60' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_msdos
        insmod xfs
        set root='hd0,msdos1'
#       if [ x$feature_platform_search_hint = xy ]; then
#         search --no-floppy --fs-uuid --set=root --hint='hd0,msdos1'  
68c4b337-a6a6-4045-9b6d-750de44610f6
#       else
#         search --no-floppy --fs-uuid --set=root 
68c4b337-a6a6-4045-9b6d-750de44610f6
#       fi
        linux16 /vmlinuz-3.10.0-327.el7.x86_64 root=/dev/mapper/centos-root ro 
crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet 
LANG=de_DE.UTF-8
        initrd16 /initramfs-3.10.0-327.el7.x86_64.img
}


if i remove the comments, the system does not boot, but reboots

i`m curious why "search" does not simply getting skipped when uuid is not 
found, as uuid is not being used at all. the menu-entries are NOT configured by 
hand but by the centos7 installer, so the installer added something to the 
grub.conf which does not make sense at all, imho. that`s a centos issue, though 
- but if search would simply be skipped i think it would do no harm and could 
be simply ignored.

regards
roland

/etc/redhat-release
CentOS Linux release 7.2.1511 (Core)

rpm -q -i grub2-2.02-0.34.el7.centos.x86_64
Name        : grub2
Epoch       : 1
Version     : 2.02
Release     : 0.34.el7.centos
Architecture: x86_64
Install Date: Mo 12 Sep 2016 15:29:08 CEST
Group       : System Environment/Base
Size        : 7398575
License     : GPLv3+
Signature   : RSA/SHA256, Mi 06 Jan 2016 17:54:25 CET, Key ID 24c6a8a7f4a80eb5
Source RPM  : grub2-2.02-0.34.el7.centos.src.rpm
Build Date  : Di 05 Jan 2016 18:52:28 CET
Build Host  : kbuilder.dev.centos.org
Relocations : (not relocatable)
URL         : http://www.gnu.org/software/grub/
Summary     : Bootloader with support for Linux, Multiboot and more
Description :
The GRand Unified Bootloader (GRUB) is a highly configurable and customizable
bootloader with modular architecture.  It support rich varietyof kernel formats,
file systems, computer architectures and hardware devices.  This subpackage
provides support for PC BIOS systems.




> Gesendet: Mittwoch, 14. September 2016 um 10:04 Uhr
> Von: "Andrei Borzenkov" <address@hidden>
> An: address@hidden, address@hidden
> Betreff: Re: grub search - reboot ?
>
> 13.09.2016 14:40, address@hidden пишет:
> > hi,
> > 
> > i`m curious, what is the expected behaviour of the grub "search"
> > command?
> > 
> > i.e. if  i have
> > 
> > search --no-floppy --fs-uuid --set=root <uuid>
> > 
> > what should happen if uuid is NOT found ?
> > 
> 
> Command terminates with error code, variable is not set.
> 
> > i see my VM reboot (and as Xenserver detects that as "too early after
> > start and thinks it`s reboot-loop, it powers down the VM).
> > 
> 
> Why do you think it is related to this command? Add some delay and debug
> print to make sure where exactly it reboots.
> 
> > i would expect that search just does not produce any result and grub
> > continues processing the config, at least it should spit out some
> > message "uuid not found, resetting..."
> > 
> > i came across this after cloning a system and transforming the system
> > disk so that fs-uuid changed, but that should not matter at all, as
> > the kernel/initrd-statement does not refer to the fs-uuid for
> > booting....
> > 
> > regards roland
> > 
> > 
> > _______________________________________________ Help-grub mailing
> > list address@hidden 
> > https://lists.gnu.org/mailman/listinfo/help-grub
> > 
> 
>