Reproducer:
#!/bin/bash
device_to_disk () {
echo "$1" | \
sed 's:\(/dev/[a-z]\+\).*:\1:'
}
device_to_disk /dev/mapper/vgubuntu-root
So device_to_disk() is doing what it is supposed to do and there was NO
CHANGE to it (as it appears).
I guess using grub-install at /dev/vda was allowed before (instead of
the LVM PV ?), so there wasn't a need to use /dev/mapper/vgubuntu-root
as the argument for grub-installer.
It is either that OR the "/dev/mapper" section of this same script,
related to:
case $prefix in
...
/dev/mapper)
disc_offered_devfs=...
...
couldn't deal with virtio disks on top of LVM (my next task here) as it
should.
Simply using:
----
#!/bin/bash
device_to_disk () {
echo "$1" | \
sed 's:\(/dev/mapper/.*\+\|/dev/[a-z]\+\).*:\1:'
}
device_to_disk /dev/mapper/vgubuntu-root
device_to_disk /dev/something/else
$ ./temp.sh
/dev/mapper/vgubuntu-root
/dev/something
----
instead, keeps the same behavior for everything else AND fixes usage
case where device is "/dev/mapper/XXXXX". This is ONE WAY of fixing
this, BUT I guess the /dev/mapper section should also work for LVM w/
virtio disks, as stated in the script, so I'm investigating this.
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https://bugs.launchpad.net/bugs/1838525
Title:
LVM setup fails to install grub on virtio storage
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