initial experiments
Signed-off-by: Christine Dodrill <me@christine.website>
This commit is contained in:
commit
58d7d713e8
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@ -0,0 +1,6 @@
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// Package gonads is a collection of monadic constructs lifted out of the Haskell and Rust
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// standard libraries for use with Go 2 generics.
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//
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// Please do not use this library in production. This package is Deprecated and should not
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// be used in production.
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package gonads
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package gonads
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import "errors"
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var (
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ErrOptionIsNone = errors.New("gonads: Option value contains nothing")
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)
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// Option is a container that might contain a value.
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type Option[T any] struct {
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val *T
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}
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// IsSome returns true if the option contains a value.
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func (o Option[T]) IsSome() bool {
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return o.val != nil
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}
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// IsNone returns false if the option does not contain a value.
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func (o Option[T]) IsNone() bool {
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return !o.IsSome()
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}
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// Take safely fetches the value from the Option.
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func (o Option[T]) Take() (*T, error) {
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if o.IsNone() {
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return nil, ErrOptionIsNone
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}
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return o.val, nil
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}
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// Set assigns a value to an Option.
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func (o *Option[T]) Set(val *T) {
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o.val = val
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}
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func NewOption[T any](val *T) Option[T] {
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return Option[T]{val: val}
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}
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// Thunk represents an uncomputed value that is cached for faster use later.
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type Thunk[T any] struct {
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o Option[T]
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doer func() *T
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}
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// Force either returns the cached thunk value or computes it and caches the result.
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func (t Thunk[T]) Force() *T {
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if t.o.IsSome() {
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return t.o.val
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}
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t.o.Set(t.doer())
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return t.o.val
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}
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func NewThunk[T any](doer func() *T) Thunk[T] {
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return Thunk[T]{
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o: NewOption[T](nil),
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doer: doer,
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}
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}
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@ -0,0 +1,42 @@
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From 9988e3646e0f301602b2d0f56e6527f370ddccce Mon Sep 17 00:00:00 2001
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From: Christine Dodrill <me@christine.website>
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Date: Mon, 16 Aug 2021 19:58:24 -0400
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Subject: [PATCH] cmd/dist: support embedding of toolchain rev by envvar
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Git checkouts are not byte-for-byte reproducible and the exact hash of
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them can drift as git's moods change. This patch enables users of
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deterministic build systems such as Nix or Guix to build an exact
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revision of Go from the git repo directly by feeding the proper hash
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into the build system with the envvar GOLANG_TOOLCHAIN_REV.
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This should only be used as a last resort (such as when the source
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directory is immutable, like in the nix-build context).
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This is a port of
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https://github.com/tailscale/go/commit/6785c6aa7b55f795ece47b2ee775cd3feb58b29e.
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---
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src/cmd/dist/build.go | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/src/cmd/dist/build.go b/src/cmd/dist/build.go
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index bec17696f304..70ca59dddb3f 100644
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--- a/src/cmd/dist/build.go
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+++ b/src/cmd/dist/build.go
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@@ -343,6 +343,17 @@ func branchtag(branch string) (tag string, precise bool) {
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// findgoversion determines the Go version to use in the version string.
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func findgoversion() string {
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+ // If the magic envvar `GOLANG_TOOLCHAIN_REV` is set, use that git
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+ // revision. Git checkouts are not reproducible. This allows users
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+ // to build a compiler reproducibly from a context by feeding the
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+ // appropriate hash to the build system.
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+ if rev := os.Getenv("GOLANG_TOOLCHAIN_REV"); rev != "" {
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+ if len(rev) > 10 {
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+ rev = rev[:10]
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+ }
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+ return rev
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+ }
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+
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// The $GOROOT/VERSION file takes priority, for distributions
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// without the source repo.
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path := pathf("%s/VERSION", goroot)
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{ sources ? import ./sources.nix, pkgs ? import sources.nixpkgs { } }:
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let go = sources.go;
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in pkgs.go.overrideAttrs (attrs: rec {
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version = go.rev;
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src = go;
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nativeBuildInputs = attrs.nativeBuildInputs ++ [ pkgs.git ];
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checkPhase = "";
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GOLANG_TOOLCHAIN_REV = go.rev;
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patches = [ ./go-toolchain-rev.patch ];
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})
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{
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"go": {
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"branch": "master",
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"description": "The Go programming language",
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"homepage": "https://golang.org",
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"owner": "golang",
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"repo": "go",
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"rev": "8ff16c19909e5aecf51c6b993cba36ea51791f34",
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"sha256": "1c8nv1hxia3iaya937b4asxiiny797sd8zj648jrha3nhkldal2k",
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"type": "tarball",
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"url": "https://github.com/golang/go/archive/8ff16c19909e5aecf51c6b993cba36ea51791f34.tar.gz",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
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},
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"niv": {
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"branch": "master",
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"description": "Easy dependency management for Nix projects",
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"homepage": "https://github.com/nmattia/niv",
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"owner": "nmattia",
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"repo": "niv",
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"rev": "e0ca65c81a2d7a4d82a189f1e23a48d59ad42070",
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"sha256": "1pq9nh1d8nn3xvbdny8fafzw87mj7gsmp6pxkdl65w2g18rmcmzx",
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"type": "tarball",
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"url": "https://github.com/nmattia/niv/archive/e0ca65c81a2d7a4d82a189f1e23a48d59ad42070.tar.gz",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
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},
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"nixpkgs": {
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"branch": "nixos-unstable",
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"description": "Nix Packages collection",
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"homepage": "",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "e41ba38114055832e5ba4a851e9c00149eef3e4a",
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"sha256": "01qh41a912vk6fsdh3w6wsl45ml0lbqlc9akpbw2hasjf6wwg3kn",
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"type": "tarball",
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"url": "https://github.com/NixOS/nixpkgs/archive/e41ba38114055832e5ba4a851e9c00149eef3e4a.tar.gz",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
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}
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}
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@ -0,0 +1,174 @@
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# This file has been generated by Niv.
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let
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#
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# The fetchers. fetch_<type> fetches specs of type <type>.
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#
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fetch_file = pkgs: name: spec:
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let
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name' = sanitizeName name + "-src";
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in
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if spec.builtin or true then
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builtins_fetchurl { inherit (spec) url sha256; name = name'; }
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else
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pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
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fetch_tarball = pkgs: name: spec:
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let
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name' = sanitizeName name + "-src";
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in
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if spec.builtin or true then
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builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
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else
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pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
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fetch_git = name: spec:
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let
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ref =
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if spec ? ref then spec.ref else
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if spec ? branch then "refs/heads/${spec.branch}" else
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if spec ? tag then "refs/tags/${spec.tag}" else
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abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
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in
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builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
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fetch_local = spec: spec.path;
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fetch_builtin-tarball = name: throw
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''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
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$ niv modify ${name} -a type=tarball -a builtin=true'';
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fetch_builtin-url = name: throw
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''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
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$ niv modify ${name} -a type=file -a builtin=true'';
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#
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# Various helpers
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#
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# https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
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sanitizeName = name:
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(
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concatMapStrings (s: if builtins.isList s then "-" else s)
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(
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builtins.split "[^[:alnum:]+._?=-]+"
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((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
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)
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);
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# The set of packages used when specs are fetched using non-builtins.
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mkPkgs = sources: system:
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let
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sourcesNixpkgs =
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import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
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hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
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hasThisAsNixpkgsPath = <nixpkgs> == ./.;
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in
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if builtins.hasAttr "nixpkgs" sources
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then sourcesNixpkgs
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else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
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import <nixpkgs> {}
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else
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abort
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''
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Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
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add a package called "nixpkgs" to your sources.json.
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'';
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# The actual fetching function.
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fetch = pkgs: name: spec:
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if ! builtins.hasAttr "type" spec then
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abort "ERROR: niv spec ${name} does not have a 'type' attribute"
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else if spec.type == "file" then fetch_file pkgs name spec
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else if spec.type == "tarball" then fetch_tarball pkgs name spec
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else if spec.type == "git" then fetch_git name spec
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else if spec.type == "local" then fetch_local spec
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else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
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else if spec.type == "builtin-url" then fetch_builtin-url name
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else
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abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
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# If the environment variable NIV_OVERRIDE_${name} is set, then use
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# the path directly as opposed to the fetched source.
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replace = name: drv:
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let
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saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
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ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
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in
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if ersatz == "" then drv else
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# this turns the string into an actual Nix path (for both absolute and
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# relative paths)
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if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
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# Ports of functions for older nix versions
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# a Nix version of mapAttrs if the built-in doesn't exist
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mapAttrs = builtins.mapAttrs or (
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f: set: with builtins;
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listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
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);
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# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
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range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
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# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
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stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
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# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
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stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
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concatMapStrings = f: list: concatStrings (map f list);
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concatStrings = builtins.concatStringsSep "";
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# https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
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optionalAttrs = cond: as: if cond then as else {};
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# fetchTarball version that is compatible between all the versions of Nix
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builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
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let
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inherit (builtins) lessThan nixVersion fetchTarball;
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in
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if lessThan nixVersion "1.12" then
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fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
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else
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fetchTarball attrs;
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# fetchurl version that is compatible between all the versions of Nix
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builtins_fetchurl = { url, name ? null, sha256 }@attrs:
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let
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inherit (builtins) lessThan nixVersion fetchurl;
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in
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if lessThan nixVersion "1.12" then
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fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
|
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else
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fetchurl attrs;
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# Create the final "sources" from the config
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mkSources = config:
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mapAttrs (
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name: spec:
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if builtins.hasAttr "outPath" spec
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then abort
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||||
"The values in sources.json should not have an 'outPath' attribute"
|
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else
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spec // { outPath = replace name (fetch config.pkgs name spec); }
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) config.sources;
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# The "config" used by the fetchers
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mkConfig =
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{ sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
|
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, sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
|
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, system ? builtins.currentSystem
|
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, pkgs ? mkPkgs sources system
|
||||
}: rec {
|
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# The sources, i.e. the attribute set of spec name to spec
|
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inherit sources;
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# The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
|
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inherit pkgs;
|
||||
};
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||||
|
||||
in
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||||
mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }
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|
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@ -0,0 +1,27 @@
|
|||
{ ... }:
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||||
|
||||
let
|
||||
sources = import ./nix/sources.nix;
|
||||
pkgs = import sources.nixpkgs {
|
||||
overlays = [
|
||||
(self: super: rec {
|
||||
go = import ./nix/go.nix { };
|
||||
buildGoModule = pkgs.callPackage
|
||||
"${sources.nixpkgs}/pkgs/development/go-modules/generic" {
|
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inherit go;
|
||||
};
|
||||
gopls = super.gopls.override { inherit buildGoModule; };
|
||||
goimports = super.goimports.override { inherit buildGoModule; };
|
||||
})
|
||||
];
|
||||
};
|
||||
in pkgs.mkShell {
|
||||
buildInputs = with pkgs; [
|
||||
go
|
||||
gopls
|
||||
goimports
|
||||
|
||||
# keep this line if you use bash
|
||||
pkgs.bashInteractive
|
||||
];
|
||||
}
|
||||
Loading…
Reference in New Issue