On Saturday 03 June 2017 11:02:54 Fungi4All wrote: > -------- Original Message -------- > From: deb...@lionunicorn.co.uk > To: debian-user@lists.debian.org > > On Thu 01 Jun 2017 at 12:24:28 (-0400), Fungi4All wrote: > > Why don't just skip all this that we are in perfect agreement with > > and go to the juicy part. After all uuids are unique and fstab are > > all correct, updating-grub would mix match uuids in writing its > > grub.cfg > > Two uuids on the same entry! Over and over again.... till I edited > > it out to the correct ones and it all worked. Why does everyone > > choses to skip on this issue and keeps explaining me over and over > > what I have well understood by now? > > Well, we don't have a lot of evidence. But we do have a tiny bit: > > Ι was waiting to see if anyone else found something like this > significant and willing to contribute some wisdom I suspect the > experiment would be simple. > Let's say we make a new partition on a disk with a debian installed > system and use dd to clone that system in the new partition (I have no > idea whether doing this in the same disk or a second one makes a > difference),
I don't believe that will work. dd runs on the raw device, not to an artificially created "partition". rsync OTOH, can run on a partition to partition basis. And that should give you different blkid's. > Let's say that dd copies uuid to the new partition so we > have two partitions with the same uuid in the same system. > Intentionally we make the mistake and log in to the original system > and update-grub with the conflict. Then relogin and create new uuids > for the clone, edit ftstab and check original, then update-grub. Will > it boot having the first root or the clone root? Then look at grub.cfg > of the original to see if the uuids for each entry are matching or > there is a mismatch. > I went through the grub manual and didn't come up with an answer. It > smells like a tiny bug or room for improvement. Also, I believe that > when dd is used to copy something from disk to disk it should provide > an option of whether to produce a new uuid or retain the original > (backup, not a concurrent system). > > if [ x$feature_platform_search_hint = xy ]; then > search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos3 > --hint-efi=hd0,msdos3 --hint-baremetal=ahci0,msdos3 > --hint='hd0,msdos3' UUID on sda3 XXX else > search --no-floppy --fs-uuid --set=root UUID on sda3 YYY > fi Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene>
