diff options
Diffstat (limited to 'nixos/modules/misc/version.nix')
| -rw-r--r-- | nixos/modules/misc/version.nix | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/nixos/modules/misc/version.nix b/nixos/modules/misc/version.nix index 0540b493003..8a85035ceb7 100644 --- a/nixos/modules/misc/version.nix +++ b/nixos/modules/misc/version.nix @@ -6,6 +6,7 @@ let cfg = config.system.nixos; gitRepo = "${toString pkgs.path}/.git"; + gitRepoValid = lib.pathIsGitRepo gitRepo; gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo); in @@ -61,11 +62,18 @@ in configuration defaults in a way incompatible with stateful data. For instance, if the default version of PostgreSQL changes, the new version will probably be unable to read your - existing databases. To prevent such breakage, you can set the + existing databases. To prevent such breakage, you should set the value of this option to the NixOS release with which you want - to be compatible. The effect is that NixOS will option + to be compatible. The effect is that NixOS will use defaults corresponding to the specified release (such as using an older version of PostgreSQL). + It‘s perfectly fine and recommended to leave this value at the + release version of the first install of this system. + Changing this option will not upgrade your system. In fact it + is meant to stay constant exactly when you upgrade your system. + You should only bump this option, if you are sure that you can + or have migrated all state on your system which is affected + by this option. ''; }; @@ -84,8 +92,8 @@ in # These defaults are set here rather than up there so that # changing them would not rebuild the manual version = mkDefault (cfg.release + cfg.versionSuffix); - revision = mkIf (pathIsDirectory gitRepo) (mkDefault gitCommitId); - versionSuffix = mkIf (pathIsDirectory gitRepo) (mkDefault (".git." + gitCommitId)); + revision = mkIf gitRepoValid (mkDefault gitCommitId); + versionSuffix = mkIf gitRepoValid (mkDefault (".git." + gitCommitId)); }; # Generate /etc/os-release. See |