nixpkgs/nixos/lib/make-channel.nix

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{ pkgs, nixpkgs, version, versionSuffix }:
pkgs.releaseTools.makeSourceTarball {
name = "nixos-channel";
src = nixpkgs;
officialRelease = false; # FIXME: fix this in makeSourceTarball
inherit version versionSuffix;
buildInputs = [ pkgs.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 $out/tarballs
cp -prd . ../$releaseName
chmod -R u+w ../$releaseName
ln -s . ../$releaseName/nixpkgs # hack to make <nixpkgs> work
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
'';
}