diff options
Diffstat (limited to 'nixos/modules/misc/version.nix')
| -rw-r--r-- | nixos/modules/misc/version.nix | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/nixos/modules/misc/version.nix b/nixos/modules/misc/version.nix index ee6948db3d3..18f270cd531 100644 --- a/nixos/modules/misc/version.nix +++ b/nixos/modules/misc/version.nix @@ -30,6 +30,29 @@ in ''; }; + nixosLabel = mkOption { + type = types.str; + description = '' + NixOS version name to be used in the names of generated + outputs and boot labels. + + If you ever wanted to influence the labels in your GRUB menu, + this is option is for you. + + Can be set directly or with <envar>NIXOS_LABEL</envar> + environment variable for <command>nixos-rebuild</command>, + e.g.: + + <screen> + #!/bin/sh + today=`date +%Y%m%d` + branch=`(cd nixpkgs ; git branch 2>/dev/null | sed -n '/^\* / { s|^\* ||; p; }')` + revision=`(cd nixpkgs ; git rev-parse HEAD)` + export NIXOS_LABEL="$today.$branch-''${revision:0:7}" + nixos-rebuild switch</screen> + ''; + }; + nixosVersion = mkOption { internal = true; type = types.str; @@ -75,8 +98,9 @@ in config = { system = { - # This is set here rather than up there so that changing this - # env variable will not rebuild the manual + # These defaults are set here rather than up there so that + # changing them would not rebuild the manual + nixosLabel = mkDefault (maybeEnv "NIXOS_LABEL" cfg.nixosVersion); nixosVersion = mkDefault (maybeEnv "NIXOS_VERSION" (cfg.nixosRelease + cfg.nixosVersionSuffix)); # Note: code names must only increase in alphabetical order. |