On 9 July 2014 21:09, Tomasz Rybak <[email protected]> wrote:
> Hello everyone. > I've been trying to understand what is going on when we try > to build HVM Wheezy image using GRUB 1.99 on GRUB 1.99. > > The host is run from /dev/xvda (PVM with pvgrub). > It contains following entries in /boot/grub/device.map > (hd0) /dev/xvda > (hd1) /dev/xvdf > IMO it is left-over from creation of AMI; xvda is from > host, xvdf is from AMI - and now what was xvdf during AMI > creation is xvda when this AMI is run. > > Target (chroot) contains following entries in device.map > (hd0) /dev/xvdf > (hd0,msdos1) /dev/mapper/xvdf1 > This might be the first source of problems; when I run > grub-install with --recheck, it created device.map > like in the first case (in host). > > /dev/mapper/xvdf1 points to /dev/dm-0. It points > to it from the very beginning, it is set by kpartx -as > Neither link_fn() nor unlink_fn() from common.tasks.boot.InstallGrub > are called. > Similarly, neither _before_link_dm_node nor _before_unlink_dm_node > from base.fs.volume.Volume are called. > > /etc/fstab on target contains UUID, not /dev/mapper/xvdf1 > for root partition. I've tried changing that, but it did not help. > > From my point of view, this is rather messy. > * we have target / mounted to /dev/mapper/xvdf1, while > there exists /dev/xvdf1. > * /etc/fstab uses UUID > * grub-install is called with /dev/xvdf > * but later grub puts UUIDs into grub.cfg in root=* > > OTOH setting DISABLE_LINUX_UUID in grub configuration does not change > anything. > > I've found GRUB bug related to UUIDs but I am not sure whether > it is related to our case or not: > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741342 > > I also tried fix proposed in > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=544577#10 > but it didn't help. > > Currently I feel lost with all of this. > > Maybe time will help - it looks like GRUB from Jessie does > not have those problems ;-). OTOH now Debian stable cannot be run > on the new cheep (or free) machines like t2 which use HVM. > > Best regards. > > -- > Tomasz Rybak GPG/PGP key ID: 2AD5 9860 > Fingerprint A481 824E 7DD3 9C0E C40A 488E C654 FB33 2AD5 9860 > http://member.acm.org/~tomaszrybak > > Nice job analyzing Tomasz. I am glad I'm not the only one looking at this, I thought I was going completely insane and that there had to be something simple I missed. It seems like that is not the case. I completely agree with you regarding the mix and matching of UUIDs and devpaths, it should be cleaned up at some point. And I feel that work would become easier once there is an automated way of building, booting and testing.
