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nixpkgs/nixos/lib/make-channel.nix

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Nix

{ pkgs, nixpkgs, version, versionSuffix }:
pkgs.releaseTools.makeSourceTarball {
name = "nixos-channel";
src = nixpkgs;
officialRelease = false; # FIXME: fix this in makeSourceTarball
inherit version versionSuffix;
buildInputs = [ pkgs.nixUnstable ];
expr = builtins.readFile ./channel-expr.nix;
distPhase = ''
rm -rf .git
echo -n $VERSION_SUFFIX > .version-suffix
echo -n ${nixpkgs.rev or nixpkgs.shortRev} > .git-revision
releaseName=nixos-$VERSION$VERSION_SUFFIX
mkdir -p $out/tarballs
mkdir ../$releaseName
cp -prd . ../$releaseName/nixpkgs
chmod -R u+w ../$releaseName
ln -s nixpkgs/nixos ../$releaseName/nixos
echo "$expr" > ../$releaseName/default.nix
NIX_STATE_DIR=$TMPDIR nix-env -f ../$releaseName/default.nix -qaP --meta --xml \* > /dev/null
cd ..
chmod -R u+w $releaseName
tar cfJ $out/tarballs/$releaseName.tar.xz $releaseName
'';
}