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# `builtins.fetchTarball` only accepts a `sha256` argument in Nix version 1.12
# or later, so here we provide a function that can provide a compatible interface
# to Nix 1.11 or Nix 1.12
#
# TODO FIXME: remove this sometime after Nix 1.12 goes stable
{ url # URL of the nixpkgs tarball to download
, rev # The Git revision of nixpkgs to fetch
, sha256 # The SHA256 of the downloaded data
, system ? builtins.currentSystem # This is overridable if necessary
}:
with {
ifThenElse = { bool, thenValue, elseValue }: (
if bool then thenValue else elseValue);
};
ifThenElse {
bool = (0 <= builtins.compareVersions builtins.nixVersion "1.12");
# In Nix 1.12, we can just give a `sha256` to `builtins.fetchTarball`.
thenValue = (builtins.fetchTarball { inherit url sha256; });
# This hack should at least work for Nix 1.11
elseValue = (
(rec {
tarball = import <nix/fetchurl.nix> { inherit url sha256; };
builtin-paths = import <nix/config.nix>;
script = builtins.toFile "nixpkgs-unpacker" ''
"$coreutils/mkdir" "$out"
cd "$out"
"$gzip" --decompress < "$tarball" | "$tar" -x --strip-components=1
'';
nixpkgs = builtins.derivation {
name = "nixpkgs-${builtins.substring 0 6 rev}";
builder = builtins.storePath builtin-paths.shell;
args = [ script ];
inherit tarball system;
tar = builtins.storePath builtin-paths.tar;
gzip = builtins.storePath builtin-paths.gzip;
coreutils = builtins.storePath builtin-paths.coreutils;
};
}).nixpkgs);
}
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