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modules/misc/version.nix: populate nixosRevision based on <nixpkgs/.git> when possible (#15624)

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Example:

$ nixos-option system.nixosLabel
Value:
"16.09.git.4643ca1"
This commit is contained in:
obadz 2016-05-24 23:34:28 +01:00
parent c726773f26
commit 47950b5353
2 changed files with 32 additions and 2 deletions
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26
lib/sources.nix
View File

@ -29,4 +29,30 @@ rec {
in type == "directory" || lib.any (ext: lib.hasSuffix ext base) exts;
in builtins.filterSource filter path;
# Get the commit id of a git repo
# Example: commitIdFromGitRepo <nixpkgs/.git>
commitIdFromGitRepo =
let readCommitFromFile = path: file:
with builtins;
let fileName = toString path + "/" + file;
packedRefsName = toString path + "/packed-refs";
in if lib.pathExists fileName
then
let fileContent = readFile fileName;
# Sometimes git stores the commitId directly in the file but
# sometimes it stores something like: «ref: refs/heads/branch-name»
matchRef = match "^ref: (.*)\n$" fileContent;
in if isNull matchRef
then lib.removeSuffix "\n" fileContent
else readCommitFromFile path (lib.head matchRef)
# Sometimes, the file isn't there at all and has been packed away in the
# packed-refs file, so we have to grep through it:
else if lib.pathExists packedRefsName
then
let packedRefs = lib.splitString "\n" (readFile packedRefsName);
matchRule = match ("^(.*) " + file + "$");
matchedRefs = lib.flatten (lib.filter (m: ! (isNull m)) (map matchRule packedRefs));
in lib.head matchedRefs
else throw ("Not a .git directory: " + path);
in lib.flip readCommitFromFile "HEAD";
}

8
nixos/modules/misc/version.nix
View File

@ -5,9 +5,11 @@ with lib;
let
cfg = config.system;
releaseFile = "${toString pkgs.path}/.version";
suffixFile = "${toString pkgs.path}/.version-suffix";
releaseFile = "${toString pkgs.path}/.version";
suffixFile = "${toString pkgs.path}/.version-suffix";
revisionFile = "${toString pkgs.path}/.git-revision";
gitRepo = "${toString pkgs.path}/.git";
gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo);
in
{
@ -102,6 +104,8 @@ in
# changing them would not rebuild the manual
nixosLabel = mkDefault (maybeEnv "NIXOS_LABEL" cfg.nixosVersion);
nixosVersion = mkDefault (maybeEnv "NIXOS_VERSION" (cfg.nixosRelease + cfg.nixosVersionSuffix));
nixosRevision = mkIf (pathExists gitRepo) (mkDefault gitCommitId);
nixosVersionSuffix = mkIf (pathExists gitRepo) (mkDefault (".git." + gitCommitId));
# Note: code names must only increase in alphabetical order.
nixosCodeName = "Flounder";