I agree with you that os-prober cannot automatically tell, which kernel
files belong to which installation, if several linux installs share the
same /boot.
(1) Still, its behaviour could be easily improved: If os-prober detects
two linux installs with a shared /boot, it could simply ask the user,
which install should boot which kernel. Instead it silently fails with
no warning and the user ends up with a grub.cfg that fails booting one
of the installs.
(2) The resulting grub.cfg is definitely inconsistent, even if os-prober cannot
decide which kernel belongs to which install. To illustrate this, kindly have a
look at my original bug report (which I have later marked a duplicate of this):
Bug #554307
In the description of Bug #554307 you see the grub.cfg the user gets when
running update-grub on two installs sharing /boot. Yes, os-prober cannot
determine which install should boot which kernel. But this is not the problem I
report there. The resulting grub.cfg looks like this:
[...]
menuentry '<name of first linux OS> (on /dev/sda2)' [...] {
[...]
set root='(hd0,msdos1)' # <- this is the boot partition, /dev/sda1
search --no-floppy --fs-uuid --set=root <UUID of /dev/sda1>
linux /vmlinuz-x.x.x root=UUID=<UUID of /dev/sda2> [...]
initrd [....]
}
menuentry '<name of second linux OS> (on /dev/sda3)' [...] {
[...]
set root='(hd0,msdos1)' # <- this is the boot partition, /dev/sda1
search --no-floppy --fs-uuid --set=root <UUID-of-/dev/sda1>
linux /vmlinuz-y.y.y root=UUID=<UUID of /dev/sda2 (!!!)> [...]
initrd [....]
}
[...]
Look at the *second* menuentry: Its *name* correctly refers to the
*second* install (on /dev/sda3). Still its *linux call* refers to the
*first* install an /dev/sda2. This is clearly inconsistent and a bug.
My original report in #554307 was about this bug. If you feel that this
differs from the issues reported here, I will be unlisting this bug as a
duplicate and reopen it.
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https://bugs.launchpad.net/bugs/554307
Title:
linux-boot-prober yields wrong uuid for kernel root parameter
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