50 lines
1.5 KiB
Nix
50 lines
1.5 KiB
Nix
{ rev # The Git revision of nixpkgs to fetch
|
|
, sha256 # The SHA256 of the downloaded data
|
|
, outputSha256 ? null # The SHA256 fixed-output hash
|
|
, system ? builtins.currentSystem # This is overridable if necessary
|
|
}:
|
|
|
|
if (0 <= builtins.compareVersions builtins.nixVersion "1.12")
|
|
|
|
# In Nix 1.12, we can just give a `sha256` to `builtins.fetchTarball`.
|
|
then (
|
|
builtins.fetchTarball {
|
|
url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
|
|
sha256 = outputSha256;
|
|
})
|
|
|
|
# This hack should at least work for Nix 1.11
|
|
else (
|
|
(rec {
|
|
tarball = import <nix/fetchurl.nix> {
|
|
url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
|
|
inherit 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;
|
|
} // (if null == outputSha256 then { } else {
|
|
outputHashMode = "recursive";
|
|
outputHashAlgo = "sha256";
|
|
outputHash = outputSha256;
|
|
}));
|
|
}).nixpkgs)
|