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Omit GRUB if boot.loader.grub.device is set to "nodev"

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If we only need to generate a GRUB boot menu, we don't need GRUB
itself.  This cuts 38 MiB from EC2 system closures (in particular
because it gets rid of the need for the 32-bit Glibc).
This commit is contained in:
Eelco Dolstra 2013-06-04 14:05:07 +02:00
parent 2b63b67aa4
commit d210f30fa7
1 changed files with 13 additions and 6 deletions
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19
modules/system/boot/loader/grub/grub.nix
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@ -6,7 +6,14 @@ let
cfg = config.boot.loader.grub;
grub = if cfg.version == 1 then pkgs.grub else pkgs.grub2;
realGrub = if cfg.version == 1 then pkgs.grub else pkgs.grub2;
grub =
# Don't include GRUB if we're only generating a GRUB menu (e.g.,
# in EC2 instances).
if cfg.devices == ["nodev"]
then null
else realGrub;
f = x: if x == null then "" else "" + x;
@ -14,8 +21,8 @@ let
{ splashImage = f config.boot.loader.grub.splashImage;
grub = f grub;
shell = "${pkgs.stdenv.shell}";
fullVersion = (builtins.parseDrvName config.system.build.grub.name).version;
inherit (config.boot.loader.grub)
fullVersion = (builtins.parseDrvName realGrub.name).version;
inherit (cfg)
version extraConfig extraPerEntryConfig extraEntries
extraEntriesBeforeNixOS extraPrepareConfig configurationLimit copyKernels timeout
default devices;
@ -141,7 +148,7 @@ in
splashImage = mkOption {
default =
if config.boot.loader.grub.version == 1
if cfg.version == 1
then pkgs.fetchurl {
url = http://www.gnome-look.org/CONTENT/content-files/36909-soft-tux.xpm.gz;
sha256 = "14kqdx2lfqvh40h6fjjzqgff1mwk74dmbjvmqphi6azzra7z8d59";
@ -196,7 +203,7 @@ in
###### implementation
config = mkIf config.boot.loader.grub.enable {
config = mkIf cfg.enable {
boot.loader.grub.devices = optional (cfg.device != "") cfg.device;
@ -212,7 +219,7 @@ in
# set at once.
system.boot.loader.id = "grub";
environment.systemPackages = mkIf config.boot.loader.grub.enable [ grub ];
environment.systemPackages = [ grub ];
};