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".
/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.
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