Re: Grub Config File to long

[Pascal Hambourg]

Le 23/05/2018 à 10:12, Simon Hobson a écrit :
> Pascal Hambourg wrote:
>
> > Is this a multiboot setup with multiple GNU/Linux systems installed and using 
> > GRUB ?
> > I have observed a similar behaviour under these conditions, although I could 
> > not really explain it. I suspect it is due to a misinterpretation of other 
> > system's grub.cfg file when generating grub.cfg.
>
> Do you mean that something like this happens :
>
> Say you have 3 systems: A, B, and C
> Run update-grub on A and it finds A, B, and C - so 3 entries
> Run it then on B and it find the 3 entries in A's grub.cfg and builds it's own 
> containing B, A, C (found directly) plus A, B, C copied from A's grub.cfg.
> Run it on C and you get C, A, B (found directly) plus A, B, C copied from A's 
> grub.cfg plus B, A, C, A, B, C copied from B's grub.cfg.
>
> Thus you quickly end up with C, A, B, A, B, C, B, A, C, A, B, C - that's 12 
> entries after just once round the OSs. This will quickly run out of control, 
> growing at an ever faster rate.

Yes, I suspect something like this. But I don't know how and why it 
happens or not. It does not happen on my laptop with three successive 
versions of Debian. Actually I have only seen it indirectly from other 
peoples' grub.cfg.

> If that's what is happening, then that suggests a lack of (effective) duplicate 
> detection in update-grub - or perhaps there's none at all on the basis that you 
> should not be having multiple installs like that ?

Err, what then would be the point in having grub-mkconfig detect and 
include other Linux systems in the menu ?