nixpkgs/pkgs/stdenv/initial/default.nix

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# Here we construct an absolutely trivial `initial' standard
# environment. It's not actually a functional stdenv, since there is
# not necessarily a working C compiler. We need this to build
# gcc-wrapper et al. for the native stdenv.
{system, name}:
let {
shell = "/bin/sh";
body =
derivation {
inherit system name;
builder = shell;
args = ["-e" ./builder.sh];
}
// {
mkDerivation = attrs: derivation (attrs // {
builder = shell;
args = ["-e" attrs.builder];
stdenv = body;
system = body.system;
});
inherit shell;
};
}