Re: [gentoo-user] os-prober fails sucessfully

[John Covici]

On Tue, 17 Mar 2020 19:23:53 -0400,
Dutch Ingraham wrote:
>
> On 3/17/20 4:16 AM, Neil Bothwick wrote:
> > On Tue, 17 Mar 2020 03:00:59 -0500, Dutch Ingraham wrote:
> >
> >> Also from [1], with emphasis added "30_os-prober this script uses
> >> **os-prober to search for Linux** and other operating systems and places
> >> the results in the GRUB 2 menu.
> >>
> >> A review of the scripts 10_linux and 30_os-prober supplied by Gentoo
> >> with the grub and os-prober packages seems to confirm the Ubuntu
> >> documentation's accuracy.
> >>
> >> Regardless of which script is responsible, the problem remains that
> >> running 'grub-mkconfig -o /boot/grub/grub.cfg' under the circumstances
> >> outlined in my original post should find the other Linux operating
> >> systems, but doesn't.
> >
> > You're right, either things have changed since the days I used GRUB
> > extensively or I am losing it. No, that's not a multiple choice question!
>
> Well, you wouldn't be the first to begin losing it!  I sent the original
> question before running things through strace, so....  (It wasn't
> particularly helpful.)
> >
> > Have you tried running the script with "sh -x" to see just what it is
> > doing?
>
> It calls a helper script and exits successfully.
>
> I wonder if it could be this part
> >
> > if ! command -v os-prober > /dev/null || ! command -v linux-boot-prober >/dev/null ; then
> >    # missing os-prober and/or linux-boot-prober
> >    exit 0
> > fi
>
> Running `command -v os-prober' returns '/usr/bin/os-prober'
> >
> > If the os-prober command is missing the script will fail successfully, as
> > you experience. Is sys-boot/os-prober installed?
> >
> >
> Yes, it is installed as noted above, and, if I mount the partitions
> manually, os-prober will find them.
>
>
> I'm fairly certain I am missing one open and obvious thing, but can't
> see it.  Here is a list of things I have tried, mainly for
> thread-completeness purposes:
>
> 1. Removed grub and op-prober packages then wiped all residual config files.
>
> 2. Reinstalled both, enabling the 'mount' use flag on grub.
>
> 3. Confirmed /usr/bin/os-prober and all /etc/grub.d/{scripts} are in
> place and executable.
>
> 4. Even though it is the default, added GRUB_DISABLE_OS_PROBER=false to
> /etc/default/grub.
>
> 5. Even though it is the default, set GRUB_PLATFORMS="pc" in make.conf.
>
>
> On a fairly routine set-up (MBR/BIOS with four ext4 primary partitions)
> I should be able to just set the mount use flag on grub, install grub
> and os-prober, run 'grub-mkconfig -o /boot/grub/grub.cfg' and it should
> just detect all operating systems and write the config, right? RIGHT?
>
>

Are you sure its supposed to detect them even if they are not mounted?
How would they be able to look at the files?  Where are the image
files on these partitions?

-- 
Your life is like a penny.  You're going to lose it.  The question is:
How do
you spend it?

         John Covici wb2una
         covici@××××××××××.com