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When I boot my machine it shows all generations in a list, but naming them "Generation 49", "Generation 50", etc.

Is there a way to add labels to generations, so that I can easily see later what was changed? I'd like to have something like an optional commit message, so it could be like "Generation 49 - switched to KDE5", "Generation 50 - switched back to gnome3".

psmith
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3 Answers3

7

/boot/grub/grub.conf is currently built from:

nixos/modules/system/boot/loader/grub/install-grub.pl

# Emit submenus for all system profiles.
sub addProfile {
    my ($profile, $description) = @_;

    # Add entries for all generations of this profile.
    $conf .= "submenu \"$description\" {\n" if $grubVersion == 2;

    sub nrFromGen { my ($x) = @_; $x =~ /\/\w+-(\d+)-link/; return $1; }

    my @links = sort
        { nrFromGen($b) <=> nrFromGen($a) }
        (glob "$profile-*-link");

    my $curEntry = 0;
    foreach my $link (@links) {
        last if $curEntry++ >= $configurationLimit;
        my $date = strftime("%F", localtime(lstat($link)->mtime));
        my $version =
            -e "$link/nixos-version"
            ? readFile("$link/nixos-version")
            : basename((glob(dirname(Cwd::abs_path("$link/kernel")) . "/lib/modules/*"))[0]);
        addEntry("NixOS - Configuration " . nrFromGen($link) . " ($date - $version)", $link);
    }

    $conf .= "}\n" if $grubVersion == 2;
}

this is a single entry in grub.conf:

menuentry "NixOS - Configuration 38 (2016-01-29 - 16.03pre75806.77f8f35)" {
search --set=drive1 --fs-uuid d931bd85-8f35-4ae9-a36b-c1ac51ad7b57
  linux ($drive1)//kernels/56fkcbxnwzi0kh6vg677a4cd4zcabm55-linux-4.1.15-bzImage systemConfig=/nix/store/2sybsl278s5a8kzhplwcz5jbhbsqwdci-nixos-system-lenovo-t530-16.03pre75806.77f8f35 init=/nix/store/2sybsl278s5a8kzhplwcz5jbhbsqwdci-nixos-system-lenovo-t530-16.03pre75806.77f8f35/init loglevel=4
  initrd ($drive1)//kernels/r33fajk0kaxlfmg922c2hy4rak5cj90z-initrd-initrd
}

however, nixos-rebuild supports --profile-name, quoting the manpage:

   --profile-name, -p
       Instead of using the Nix profile /nix/var/nix/profiles/system to keep track of
       the current and previous system configurations, use
       /nix/var/nix/profiles/system-profiles/name. When you use GRUB 2, for every
       system profile created with this flag, NixOS will create a submenu named “NixOS
       - Profile 'name'” in GRUB’s boot menu, containing the current and previous
       configurations of this profile.

       For instance, if you want to test a configuration file named test.nix without
       affecting the default system profile, you would do:

           $ nixos-rebuild switch -p test -I nixos-config=./test.nix

       The new configuration will appear in the GRUB 2 submenu “NixOS - Profile
       'test'”.

summary: hope this is what you are looking for.

invalidmagic
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    This seems like what I wanted. However, I'm not using NixOS anymore, so I cannot verify your answer. – psmith Feb 27 '16 at 15:27
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    It's not what he's looking for I think. These profile names are like single-generaton branches as far as I understand them. What he wants is to label all the generations on trunk. (and so do I) – 0fnt Apr 24 '19 at 10:49
1

NIXOS_LABEL="changed-some-settings" nixos-rebuild switch

Squirrel
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0

system.nixos.label

You can set it either in your config, or in the environment (using NIXOS_LABEL).

neoney
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