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nixpkgs/nixos/lib/make-channel.nix

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/*
Build a channel tarball. These contain, in addition to the nixpkgs
expressions themselves, files that indicate the version of nixpkgs
that they represent.
*/
{
pkgs,
nixpkgs,
version,
versionSuffix,
}:
pkgs.releaseTools.makeSourceTarball {
name = "nixos-channel";
src = nixpkgs;
officialRelease = false; # FIXME: fix this in makeSourceTarball
inherit version versionSuffix;
buildInputs = with pkgs; [
nix
zstd
];
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 --show-trace --xml \* > /dev/null
cd ..
chmod -R u+w $releaseName
# The compression tasks are shortlived; use all available CPUs (-T0) to
# prioritize fast channel advancement.
XZ_OPT="-T0" tar \
--create \
--file=$out/tarballs/$releaseName.tar.xz \
--xz \
--absolute-names \
--owner=0 \
--group=0 \
--numeric-owner \
--format=gnu \
--sort=name \
--mtime="@$SOURCE_DATE_EPOCH" \
--hard-dereference \
$releaseName
tar \
--create \
--file="$out/tarballs/$releaseName.tar.zst" \
--use-compress-program="zstd -19 -T0" \
--absolute-names \
--owner=0 \
--group=0 \
--numeric-owner \
--format=gnu \
--sort=name \
--mtime="@$SOURCE_DATE_EPOCH" \
--hard-dereference \
$releaseName
'';
}