Danny Milosavljevic transcribed 2.9K bytes: > Hi Martin, > > On Sat, 24 Mar 2018 14:56:03 +0100 > Martin Castillo <casti...@uni-bremen.de> wrote: > > > ng0 wrote: > > > So basically you want a field in the operating-system declaration where > > > you > > > can _manually_ set a description of a certain maximum length which will be > > > added to the GRUB entry of the generated system generation? > > yes > > I wonder whether this description can be generated instead - we have all > the information we need - the packages, the users that are there etc.
But how much space do we have in the GRUB descriptions? I have computers with
800x600 or what
it was resolution for the screen, and while this would be a nice feature I
wonder if there's
some implications in GRUB menu readability.
I'm not an expert in GRUB, I can boot without a menu, but GRUB is a small
operating system
on its own :)
> Or a description could be generated only if a custom description is not
> specified.
>
> In fact it's easy to add this and would be a nice intro project for a
> person interested in Guix development. I can mentor.
>
> The thing used to fill the Guix bootloader entries is <boot-parameters>.
>
> There's a procedure "operating-system-boot-parameters" which is used
> to generate <boot-parameters> instances from an <operating-system>
> declaration.
>
> (operating-system-bootcfg calls operating-system-boot-parameters)
> (perform-action calls operating-system-bootcfg)
> (perform-action is in the top-level guix script)
>
> <boot-parameters> are serialized to disk into:
>
> /var/guix/profiles/system-704-link$ cat parameters
> (boot-parameters (version 0) (label "GNU with Linux-Libre 4.14.14 (beta)")
> (root-device "dayas:/") (kernel
> "/gnu/store/fnk2xhicbrjsvbq082p6x0ch6npkrg0z-linux-libre-4.14.14/bzImage")
> (kernel-arguments ("crashkernel=256M" "modprobe.blacklist=pcspkr,snd_pcsp"
> "quiet" "acpi_osi=Linux" "clocksource=acpi_pm" "allow-discards"
> "root_trim=yes")) (initrd
> "/gnu/store/nvhkdssz1m1p8xrggi78y8pd7jz4p3ng-raw-initrd/initrd")
> (bootloader-name grub) (store (device "dayas:/") (mount-point "/")))
>
> But I wouldn't change the serialization format or what fields
> <boot-parameters> contain.
>
> Just change operating-system-bootcfg to take a "description" parameter.
> And change operating-system-boot-parameters to take a "description" parameter
> and
> use it to calculate the label.
>
> And change perform-action to calculate the value for to "description"
> parameter in this way:
> - Taking it from <operating-system> (or the command line?)
> - Falling back to an automatic value (comparing it to the previous
> generation) otherwise.
>
> That's it.
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