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version.nix: extract revision-fetching function

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This commit is contained in:
Graham Christensen 2018-10-05 10:48:42 -04:00
parent 730dac1d7b
commit 4312cfdbda
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2 changed files with 11 additions and 4 deletions
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10
lib/trivial.nix
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@ -105,6 +105,16 @@ rec {
then lib.strings.fileContents suffixFile
else "pre-git";
# Attempt to get the revision nixpkgs is from
revisionWithDefault = default:
let
revisionFile = "${toString ./..}/.git-revision";
gitRepo = "${toString ./..}/.git";
in if lib.pathIsDirectory gitRepo
then lib.commitIdFromGitRepo gitRepo
else if lib.pathExists revisionFile then lib.fileContents revisionFile
else default;
nixpkgsVersion = builtins.trace "`lib.nixpkgsVersion` is deprecated, use `lib.version` instead!" version;
# Whether we're being called by nix-shell.

5
nixos/modules/misc/version.nix
View File

@ -5,7 +5,6 @@ with lib;
let
cfg = config.system.nixos;
revisionFile = "${toString pkgs.path}/.git-revision";
gitRepo = "${toString pkgs.path}/.git";
gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo);
in
@ -37,9 +36,7 @@ in
nixos.revision = mkOption {
internal = true;
type = types.str;
default = if pathIsDirectory gitRepo then commitIdFromGitRepo gitRepo
else if pathExists revisionFile then fileContents revisionFile
else "master";
default = lib.trivial.revisionWithDefault "master";
description = "The Git revision from which this NixOS configuration was built.";
};