mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-15 14:26:33 +01:00
895 lines
30 KiB
Nix
895 lines
30 KiB
Nix
{ lib, config, stdenv, stdenvNoCC, jq, lndir, runtimeShell, shellcheck-minimal }:
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||
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let
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inherit (lib)
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optionalAttrs
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warn
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;
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in
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rec {
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||
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# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
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# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-runCommand
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runCommand = name: env: runCommandWith {
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stdenv = stdenvNoCC;
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runLocal = false;
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inherit name;
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derivationArgs = env;
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};
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# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
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# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-runCommandLocal
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runCommandLocal = name: env: runCommandWith {
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stdenv = stdenvNoCC;
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runLocal = true;
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inherit name;
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derivationArgs = env;
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};
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# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
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# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-runCommandCC
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runCommandCC = name: env: runCommandWith {
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stdenv = stdenv;
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runLocal = false;
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inherit name;
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derivationArgs = env;
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};
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# `runCommandCCLocal` left out on purpose.
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# We shouldn’t force the user to have a cc in scope.
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# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
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# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-runCommandWith
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runCommandWith =
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let
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# prevent infinite recursion for the default stdenv value
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defaultStdenv = stdenv;
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in
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{
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# which stdenv to use, defaults to a stdenv with a C compiler, pkgs.stdenv
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stdenv ? defaultStdenv
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# whether to build this derivation locally instead of substituting
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, runLocal ? false
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# extra arguments to pass to stdenv.mkDerivation
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, derivationArgs ? { }
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# name of the resulting derivation
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, name
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# TODO(@Artturin): enable strictDeps always
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}: buildCommand:
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stdenv.mkDerivation ({
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enableParallelBuilding = true;
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inherit buildCommand name;
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passAsFile = [ "buildCommand" ]
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++ (derivationArgs.passAsFile or [ ]);
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}
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// lib.optionalAttrs (! derivationArgs?meta) {
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pos = let args = builtins.attrNames derivationArgs; in
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if builtins.length args > 0
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then builtins.unsafeGetAttrPos (builtins.head args) derivationArgs
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else null;
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}
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// (lib.optionalAttrs runLocal {
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preferLocalBuild = true;
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allowSubstitutes = false;
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})
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// builtins.removeAttrs derivationArgs [ "passAsFile" ]);
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# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
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# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-writeTextFile
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writeTextFile =
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{ name
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, text
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, executable ? false
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, destination ? ""
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, checkPhase ? ""
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, meta ? { }
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, allowSubstitutes ? false
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, preferLocalBuild ? true
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, derivationArgs ? { }
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}:
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let
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matches = builtins.match "/bin/([^/]+)" destination;
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in
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runCommand name
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({
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inherit text executable checkPhase allowSubstitutes preferLocalBuild;
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passAsFile = [ "text" ]
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++ derivationArgs.passAsFile or [ ];
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meta = lib.optionalAttrs (executable && matches != null)
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{
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mainProgram = lib.head matches;
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} // meta // derivationArgs.meta or {};
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} // removeAttrs derivationArgs [ "passAsFile" "meta" ])
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''
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target=$out${lib.escapeShellArg destination}
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mkdir -p "$(dirname "$target")"
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if [ -e "$textPath" ]; then
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mv "$textPath" "$target"
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else
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echo -n "$text" > "$target"
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fi
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if [ -n "$executable" ]; then
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chmod +x "$target"
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fi
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eval "$checkPhase"
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'';
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# See doc/build-helpers/trivial-build-helpers.chapter.md
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# or https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-text-writing
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writeText = name: text:
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# TODO: To fully deprecate, replace the assertion with `lib.isString` and remove the warning
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assert lib.assertMsg (lib.strings.isConvertibleWithToString text) ''
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pkgs.writeText ${lib.strings.escapeNixString name}: The second argument should be a string, but it's a ${builtins.typeOf text} instead.'';
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lib.warnIf (! lib.isString text) ''
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pkgs.writeText ${lib.strings.escapeNixString name}: The second argument should be a string, but it's a ${builtins.typeOf text} instead, which is deprecated. Use `toString` to convert the value to a string first.''
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writeTextFile { inherit name text; };
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# See doc/build-helpers/trivial-build-helpers.chapter.md
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# or https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-text-writing
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writeTextDir = path: text: writeTextFile {
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inherit text;
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name = builtins.baseNameOf path;
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destination = "/${path}";
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};
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# See doc/build-helpers/trivial-build-helpers.chapter.md
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# or https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-text-writing
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writeScript = name: text: writeTextFile { inherit name text; executable = true; };
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# See doc/build-helpers/trivial-build-helpers.chapter.md
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# or https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-text-writing
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writeScriptBin = name: text: writeTextFile {
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inherit name text;
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executable = true;
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destination = "/bin/${name}";
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};
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# See doc/build-helpers/trivial-build-helpers.chapter.md
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# or https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-text-writing
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writeShellScript = name: text:
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writeTextFile {
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inherit name;
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executable = true;
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text = ''
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#!${runtimeShell}
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${text}
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'';
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checkPhase = ''
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${stdenv.shellDryRun} "$target"
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'';
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};
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# See doc/build-helpers/trivial-build-helpers.chapter.md
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# or https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-text-writing
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writeShellScriptBin = name: text:
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writeTextFile {
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inherit name;
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executable = true;
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destination = "/bin/${name}";
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text = ''
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#!${runtimeShell}
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${text}
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'';
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checkPhase = ''
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${stdenv.shellDryRun} "$target"
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'';
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meta.mainProgram = name;
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};
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# TODO: move parameter documentation to the Nixpkgs manual
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# See doc/build-helpers/trivial-build-helpers.chapter.md
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# or https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-writeShellApplication
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writeShellApplication =
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{
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/*
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The name of the script to write.
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Type: String
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*/
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name,
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/*
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The shell script's text, not including a shebang.
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Type: String
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*/
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text,
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/*
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Inputs to add to the shell script's `$PATH` at runtime.
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Type: [String|Derivation]
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*/
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runtimeInputs ? [ ],
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/*
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Extra environment variables to set at runtime.
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Type: AttrSet
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*/
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runtimeEnv ? null,
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/*
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`stdenv.mkDerivation`'s `meta` argument.
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Type: AttrSet
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*/
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meta ? { },
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/*
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The `checkPhase` to run. Defaults to `shellcheck` on supported
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platforms and `bash -n`.
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The script path will be given as `$target` in the `checkPhase`.
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Type: String
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*/
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checkPhase ? null,
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/*
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Checks to exclude when running `shellcheck`, e.g. `[ "SC2016" ]`.
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See <https://www.shellcheck.net/wiki/> for a list of checks.
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Type: [String]
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*/
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excludeShellChecks ? [ ],
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/*
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Extra command-line flags to pass to ShellCheck.
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Type: [String]
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*/
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extraShellCheckFlags ? [ ],
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/*
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Bash options to activate with `set -o` at the start of the script.
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Defaults to `[ "errexit" "nounset" "pipefail" ]`.
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Type: [String]
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*/
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bashOptions ? [ "errexit" "nounset" "pipefail" ],
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/* Extra arguments to pass to `stdenv.mkDerivation`.
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:::{.caution}
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Certain derivation attributes are used internally,
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overriding those could cause problems.
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:::
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Type: AttrSet
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*/
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derivationArgs ? { },
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}:
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writeTextFile {
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inherit name meta derivationArgs;
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executable = true;
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destination = "/bin/${name}";
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allowSubstitutes = true;
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preferLocalBuild = false;
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text = ''
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#!${runtimeShell}
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${lib.concatMapStringsSep "\n" (option: "set -o ${option}") bashOptions}
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'' + lib.optionalString (runtimeEnv != null)
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(lib.concatStrings
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(lib.mapAttrsToList
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(name: value: ''
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${lib.toShellVar name value}
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export ${name}
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'')
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runtimeEnv))
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+ lib.optionalString (runtimeInputs != [ ]) ''
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export PATH="${lib.makeBinPath runtimeInputs}:$PATH"
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'' + ''
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${text}
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'';
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checkPhase =
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# GHC (=> shellcheck) isn't supported on some platforms (such as risc-v)
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# but we still want to use writeShellApplication on those platforms
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let
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shellcheckSupported = lib.meta.availableOn stdenv.buildPlatform shellcheck-minimal.compiler;
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excludeFlags = lib.optionals (excludeShellChecks != [ ]) [ "--exclude" (lib.concatStringsSep "," excludeShellChecks) ];
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shellcheckCommand = lib.optionalString shellcheckSupported ''
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# use shellcheck which does not include docs
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# pandoc takes long to build and documentation isn't needed for just running the cli
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${lib.getExe shellcheck-minimal} ${lib.escapeShellArgs (excludeFlags ++ extraShellCheckFlags)} "$target"
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'';
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in
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if checkPhase == null then ''
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runHook preCheck
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${stdenv.shellDryRun} "$target"
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${shellcheckCommand}
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runHook postCheck
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''
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else checkPhase;
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};
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# Create a C binary
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# TODO: add to writers? pkgs/build-support/writers
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writeCBin = pname: code:
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runCommandCC pname
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{
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inherit pname code;
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executable = true;
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passAsFile = [ "code" ];
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# Pointless to do this on a remote machine.
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preferLocalBuild = true;
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allowSubstitutes = false;
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meta = {
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mainProgram = pname;
|
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};
|
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}
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''
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n=$out/bin/${pname}
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mkdir -p "$(dirname "$n")"
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mv "$codePath" code.c
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$CC -x c code.c -o "$n"
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'';
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# TODO: deduplicate with documentation in doc/build-helpers/trivial-build-helpers.chapter.md
|
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# see also https://github.com/NixOS/nixpkgs/pull/249721
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# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-concatText
|
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/* concat a list of files to the nix store.
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The contents of files are added to the file in the store.
|
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|
||
Example:
|
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|
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|
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# Writes my-file to /nix/store/<store path>
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||
concatTextFile {
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||
name = "my-file";
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files = [ drv1 "${drv2}/path/to/file" ];
|
||
}
|
||
|
||
|
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See also the `concatText` helper function below.
|
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|
||
|
||
# Writes executable my-file to /nix/store/<store path>/bin/my-file
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concatTextFile {
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name = "my-file";
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files = [ drv1 "${drv2}/path/to/file" ];
|
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executable = true;
|
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destination = "/bin/my-file";
|
||
}
|
||
|
||
|
||
*/
|
||
concatTextFile =
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{ name # the name of the derivation
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, files
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, executable ? false # run chmod +x ?
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, destination ? "" # relative path appended to $out eg "/bin/foo"
|
||
, checkPhase ? "" # syntax checks, e.g. for scripts
|
||
, meta ? { }
|
||
}:
|
||
runCommandLocal name
|
||
{ inherit files executable checkPhase meta destination; }
|
||
''
|
||
file=$out$destination
|
||
mkdir -p "$(dirname "$file")"
|
||
cat $files > "$file"
|
||
|
||
if [ -n "$executable" ]; then
|
||
chmod +x "$file"
|
||
fi
|
||
|
||
eval "$checkPhase"
|
||
'';
|
||
|
||
# TODO: deduplicate with documentation in doc/build-helpers/trivial-build-helpers.chapter.md
|
||
# see also https://github.com/NixOS/nixpkgs/pull/249721
|
||
# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-concatText
|
||
/*
|
||
Writes a text file to nix store with no optional parameters available.
|
||
|
||
Example:
|
||
|
||
|
||
# Writes contents of files to /nix/store/<store path>
|
||
concatText "my-file" [ file1 file2 ]
|
||
|
||
|
||
*/
|
||
concatText = name: files: concatTextFile { inherit name files; };
|
||
|
||
# TODO: deduplicate with documentation in doc/build-helpers/trivial-build-helpers.chapter.md
|
||
# see also https://github.com/NixOS/nixpkgs/pull/249721
|
||
# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-concatText
|
||
/*
|
||
Writes a text file to nix store with and mark it as executable.
|
||
|
||
Example:
|
||
# Writes contents of files to /nix/store/<store path>
|
||
concatScript "my-file" [ file1 file2 ]
|
||
|
||
*/
|
||
concatScript = name: files: concatTextFile { inherit name files; executable = true; };
|
||
|
||
|
||
/*
|
||
TODO: Deduplicate this documentation.
|
||
More docs in doc/build-helpers/trivial-build-helpers.chapter.md
|
||
See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-symlinkJoin
|
||
|
||
Create a forest of symlinks to the files in `paths`.
|
||
|
||
This creates a single derivation that replicates the directory structure
|
||
of all the input paths.
|
||
|
||
BEWARE: it may not "work right" when the passed paths contain symlinks to directories.
|
||
|
||
Example:
|
||
|
||
|
||
# adds symlinks of hello to current build.
|
||
symlinkJoin { name = "myhello"; paths = [ pkgs.hello ]; }
|
||
|
||
|
||
|
||
|
||
# adds symlinks of hello and stack to current build and prints "links added"
|
||
symlinkJoin { name = "myexample"; paths = [ pkgs.hello pkgs.stack ]; postBuild = "echo links added"; }
|
||
|
||
|
||
This creates a derivation with a directory structure like the following:
|
||
|
||
|
||
/nix/store/sglsr5g079a5235hy29da3mq3hv8sjmm-myexample
|
||
|-- bin
|
||
| |-- hello -> /nix/store/qy93dp4a3rqyn2mz63fbxjg228hffwyw-hello-2.10/bin/hello
|
||
| `-- stack -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/bin/stack
|
||
`-- share
|
||
|-- bash-completion
|
||
| `-- completions
|
||
| `-- stack -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/share/bash-completion/completions/stack
|
||
|-- fish
|
||
| `-- vendor_completions.d
|
||
| `-- stack.fish -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/share/fish/vendor_completions.d/stack.fish
|
||
...
|
||
|
||
|
||
symlinkJoin and linkFarm are similar functions, but they output
|
||
derivations with different structure.
|
||
|
||
symlinkJoin is used to create a derivation with a familiar directory
|
||
structure (top-level bin/, share/, etc), but with all actual files being symlinks to
|
||
the files in the input derivations.
|
||
|
||
symlinkJoin is used many places in nixpkgs to create a single derivation
|
||
that appears to contain binaries, libraries, documentation, etc from
|
||
multiple input derivations.
|
||
|
||
linkFarm is instead used to create a simple derivation with symlinks to
|
||
other derivations. A derivation created with linkFarm is often used in CI
|
||
as a easy way to build multiple derivations at once.
|
||
*/
|
||
symlinkJoin =
|
||
args_@{ name
|
||
, paths
|
||
, preferLocalBuild ? true
|
||
, allowSubstitutes ? false
|
||
, postBuild ? ""
|
||
, ...
|
||
}:
|
||
let
|
||
args = removeAttrs args_ [ "name" "postBuild" ]
|
||
// {
|
||
inherit preferLocalBuild allowSubstitutes;
|
||
passAsFile = [ "paths" ];
|
||
}; # pass the defaults
|
||
in
|
||
runCommand name args
|
||
''
|
||
mkdir -p $out
|
||
for i in $(cat $pathsPath); do
|
||
${lndir}/bin/lndir -silent $i $out
|
||
done
|
||
${postBuild}
|
||
'';
|
||
|
||
# TODO: move linkFarm docs to the Nixpkgs manual
|
||
/*
|
||
Quickly create a set of symlinks to derivations.
|
||
|
||
This creates a simple derivation with symlinks to all inputs.
|
||
|
||
entries can be a list of attribute sets like
|
||
|
||
[ { name = "name" ; path = "/nix/store/..."; } ]
|
||
|
||
|
||
or an attribute set name -> path like:
|
||
|
||
{ name = "/nix/store/..."; other = "/nix/store/..."; }
|
||
|
||
|
||
Example:
|
||
|
||
# Symlinks hello and stack paths in store to current $out/hello-test and
|
||
# $out/foobar.
|
||
linkFarm "myexample" [ { name = "hello-test"; path = pkgs.hello; } { name = "foobar"; path = pkgs.stack; } ]
|
||
|
||
This creates a derivation with a directory structure like the following:
|
||
|
||
/nix/store/qc5728m4sa344mbks99r3q05mymwm4rw-myexample
|
||
|-- foobar -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1
|
||
`-- hello-test -> /nix/store/qy93dp4a3rqyn2mz63fbxjg228hffwyw-hello-2.10
|
||
|
||
|
||
See the note on symlinkJoin for the difference between linkFarm and symlinkJoin.
|
||
*/
|
||
linkFarm = name: entries:
|
||
let
|
||
entries' =
|
||
if (lib.isAttrs entries) then entries
|
||
# We do this foldl to have last-wins semantics in case of repeated entries
|
||
else if (lib.isList entries) then lib.foldl (a: b: a // { "${b.name}" = b.path; }) { } entries
|
||
else throw "linkFarm entries must be either attrs or a list!";
|
||
|
||
linkCommands = lib.mapAttrsToList
|
||
(name: path: ''
|
||
mkdir -p "$(dirname ${lib.escapeShellArg "${name}"})"
|
||
ln -s ${lib.escapeShellArg "${path}"} ${lib.escapeShellArg "${name}"}
|
||
'')
|
||
entries';
|
||
in
|
||
runCommand name
|
||
{
|
||
preferLocalBuild = true;
|
||
allowSubstitutes = false;
|
||
passthru.entries = entries';
|
||
} ''
|
||
mkdir -p $out
|
||
cd $out
|
||
${lib.concatStrings linkCommands}
|
||
'';
|
||
|
||
# TODO: move linkFarmFromDrvs docs to the Nixpkgs manual
|
||
/*
|
||
Easily create a linkFarm from a set of derivations.
|
||
|
||
This calls linkFarm with a list of entries created from the list of input
|
||
derivations. It turns each input derivation into an attribute set
|
||
like { name = drv.name ; path = drv }, and passes this to linkFarm.
|
||
|
||
Example:
|
||
|
||
# Symlinks the hello, gcc, and ghc derivations in $out
|
||
linkFarmFromDrvs "myexample" [ pkgs.hello pkgs.gcc pkgs.ghc ]
|
||
|
||
This creates a derivation with a directory structure like the following:
|
||
|
||
|
||
/nix/store/m3s6wkjy9c3wy830201bqsb91nk2yj8c-myexample
|
||
|-- gcc-wrapper-9.2.0 -> /nix/store/fqhjxf9ii4w4gqcsx59fyw2vvj91486a-gcc-wrapper-9.2.0
|
||
|-- ghc-8.6.5 -> /nix/store/gnf3s07bglhbbk4y6m76sbh42siym0s6-ghc-8.6.5
|
||
`-- hello-2.10 -> /nix/store/k0ll91c4npk4lg8lqhx00glg2m735g74-hello-2.10
|
||
|
||
*/
|
||
linkFarmFromDrvs = name: drvs:
|
||
let mkEntryFromDrv = drv: { name = drv.name; path = drv; };
|
||
in linkFarm name (map mkEntryFromDrv drvs);
|
||
|
||
# TODO: move onlyBin docs to the Nixpkgs manual
|
||
/*
|
||
Produce a derivation that links to the target derivation's `/bin`,
|
||
and *only* `/bin`.
|
||
|
||
This is useful when your favourite package doesn't have a separate
|
||
bin output and other contents of the package's output (e.g. setup
|
||
hooks) cause trouble when used in your environment.
|
||
*/
|
||
onlyBin = drv: runCommand "${drv.name}-only-bin" { } ''
|
||
mkdir -p $out
|
||
ln -s ${lib.getBin drv}/bin $out/bin
|
||
'';
|
||
|
||
|
||
# Docs in doc/build-helpers/special/makesetuphook.section.md
|
||
# See https://nixos.org/manual/nixpkgs/unstable/#sec-pkgs.makeSetupHook
|
||
makeSetupHook =
|
||
{ name ? lib.warn "calling makeSetupHook without passing a name is deprecated." "hook"
|
||
, deps ? [ ]
|
||
# hooks go in nativeBuildInput so these will be nativeBuildInput
|
||
, propagatedBuildInputs ? [ ]
|
||
# these will be buildInputs
|
||
, depsTargetTargetPropagated ? [ ]
|
||
, meta ? { }
|
||
, passthru ? { }
|
||
, substitutions ? { }
|
||
}:
|
||
script:
|
||
runCommand name
|
||
(substitutions // {
|
||
# TODO(@Artturin:) substitutions should be inside the env attrset
|
||
# but users are likely passing non-substitution arguments through substitutions
|
||
# turn off __structuredAttrs to unbreak substituteAll
|
||
__structuredAttrs = false;
|
||
inherit meta;
|
||
inherit depsTargetTargetPropagated;
|
||
propagatedBuildInputs =
|
||
# remove list conditionals before 23.11
|
||
lib.warnIf (!lib.isList deps) "'deps' argument to makeSetupHook must be a list. content of deps: ${toString deps}"
|
||
(lib.warnIf (deps != [ ]) "'deps' argument to makeSetupHook is deprecated and will be removed in release 23.11., Please use propagatedBuildInputs instead. content of deps: ${toString deps}"
|
||
propagatedBuildInputs ++ (if lib.isList deps then deps else [ deps ]));
|
||
strictDeps = true;
|
||
# TODO 2023-01, no backport: simplify to inherit passthru;
|
||
passthru = passthru
|
||
// optionalAttrs (substitutions?passthru)
|
||
(warn "makeSetupHook (name = ${lib.strings.escapeNixString name}): `substitutions.passthru` is deprecated. Please set `passthru` directly."
|
||
substitutions.passthru);
|
||
})
|
||
(''
|
||
mkdir -p $out/nix-support
|
||
cp ${script} $out/nix-support/setup-hook
|
||
recordPropagatedDependencies
|
||
'' + lib.optionalString (substitutions != { }) ''
|
||
substituteAll ${script} $out/nix-support/setup-hook
|
||
'');
|
||
|
||
|
||
# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
|
||
# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-writeReferencesToFile
|
||
# TODO: Convert to throw after Nixpkgs 24.05 branch-off.
|
||
writeReferencesToFile = (if config.allowAliases then lib.warn else throw)
|
||
"writeReferencesToFile is deprecated in favour of writeClosure"
|
||
(path: writeClosure [ path ]);
|
||
|
||
# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
|
||
# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-writeClosure
|
||
writeClosure = paths: runCommand "runtime-deps"
|
||
{
|
||
# Get the cleaner exportReferencesGraph interface
|
||
__structuredAttrs = true;
|
||
exportReferencesGraph.graph = paths;
|
||
nativeBuildInputs = [ jq ];
|
||
}
|
||
''
|
||
jq -r ".graph | map(.path) | sort | .[]" "$NIX_ATTRS_JSON_FILE" > "$out"
|
||
'';
|
||
|
||
# Docs in doc/build-helpers/trivial-build-helpers.chapter.md
|
||
# See https://nixos.org/manual/nixpkgs/unstable/#trivial-builder-writeDirectReferencesToFile
|
||
writeDirectReferencesToFile = path: runCommand "runtime-references"
|
||
{
|
||
exportReferencesGraph = [ "graph" path ];
|
||
inherit path;
|
||
}
|
||
''
|
||
touch ./references
|
||
while read p; do
|
||
read dummy
|
||
read nrRefs
|
||
if [[ $p == $path ]]; then
|
||
for ((i = 0; i < nrRefs; i++)); do
|
||
read ref;
|
||
echo $ref >>./references
|
||
done
|
||
else
|
||
for ((i = 0; i < nrRefs; i++)); do
|
||
read ref;
|
||
done
|
||
fi
|
||
done < graph
|
||
sort ./references >$out
|
||
'';
|
||
|
||
# TODO: move writeStringReferencesToFile docs to the Nixpkgs manual
|
||
/*
|
||
Extract a string's references to derivations and paths (its
|
||
context) and write them to a text file, removing the input string
|
||
itself from the dependency graph. This is useful when you want to
|
||
make a derivation depend on the string's references, but not its
|
||
contents (to avoid unnecessary rebuilds, for example).
|
||
|
||
Note that this only works as intended on Nix >= 2.3.
|
||
*/
|
||
writeStringReferencesToFile = string:
|
||
/*
|
||
The basic operation this performs is to copy the string context
|
||
from `string` to a second string and wrap that string in a
|
||
derivation. However, that alone is not enough, since nothing in the
|
||
string refers to the output paths of the derivations/paths in its
|
||
context, meaning they'll be considered build-time dependencies and
|
||
removed from the wrapper derivation's closure. Putting the
|
||
necessary output paths in the new string is however not very
|
||
straightforward - the attrset returned by `getContext` contains
|
||
only references to derivations' .drv-paths, not their output
|
||
paths. In order to "convert" them, we try to extract the
|
||
corresponding paths from the original string using regex.
|
||
*/
|
||
let
|
||
# Taken from https://github.com/NixOS/nix/blob/130284b8508dad3c70e8160b15f3d62042fc730a/src/libutil/hash.cc#L84
|
||
nixHashChars = "0123456789abcdfghijklmnpqrsvwxyz";
|
||
context = builtins.getContext string;
|
||
derivations = lib.filterAttrs (n: v: v ? outputs) context;
|
||
# Objects copied from outside of the store, such as paths and
|
||
# `builtins.fetch*`ed ones
|
||
sources = lib.attrNames (lib.filterAttrs (n: v: v ? path) context);
|
||
packages =
|
||
lib.mapAttrs'
|
||
(name: value:
|
||
{
|
||
inherit value;
|
||
name = lib.head (builtins.match "${builtins.storeDir}/[${nixHashChars}]+-(.*)\.drv" name);
|
||
})
|
||
derivations;
|
||
# The syntax of output paths differs between outputs named `out`
|
||
# and other, explicitly named ones. For explicitly named ones,
|
||
# the output name is suffixed as `-name`, but `out` outputs
|
||
# aren't suffixed at all, and thus aren't easily distinguished
|
||
# from named output paths. Therefore, we find all the named ones
|
||
# first so we can use them to remove false matches when looking
|
||
# for `out` outputs (see the definition of `outputPaths`).
|
||
namedOutputPaths =
|
||
lib.flatten
|
||
(lib.mapAttrsToList
|
||
(name: value:
|
||
(map
|
||
(output:
|
||
lib.filter
|
||
lib.isList
|
||
(builtins.split "(${builtins.storeDir}/[${nixHashChars}]+-${name}-${output})" string))
|
||
(lib.remove "out" value.outputs)))
|
||
packages);
|
||
# Only `out` outputs
|
||
outputPaths =
|
||
lib.flatten
|
||
(lib.mapAttrsToList
|
||
(name: value:
|
||
if lib.elem "out" value.outputs then
|
||
lib.filter
|
||
(x: lib.isList x &&
|
||
# If the matched path is in `namedOutputPaths`,
|
||
# it's a partial match of an output path where
|
||
# the output name isn't `out`
|
||
lib.all (o: !lib.hasPrefix (lib.head x) o) namedOutputPaths)
|
||
(builtins.split "(${builtins.storeDir}/[${nixHashChars}]+-${name})" string)
|
||
else
|
||
[ ])
|
||
packages);
|
||
allPaths = lib.concatStringsSep "\n" (lib.unique (sources ++ namedOutputPaths ++ outputPaths));
|
||
allPathsWithContext = builtins.appendContext allPaths context;
|
||
in
|
||
if builtins ? getContext then
|
||
writeText "string-references" allPathsWithContext
|
||
else
|
||
writeDirectReferencesToFile (writeText "string-file" string);
|
||
|
||
|
||
# Docs in doc/build-helpers/fetchers.chapter.md
|
||
# See https://nixos.org/manual/nixpkgs/unstable/#requirefile
|
||
requireFile =
|
||
{ name ? null
|
||
, sha256 ? null
|
||
, sha1 ? null
|
||
, hash ? null
|
||
, url ? null
|
||
, message ? null
|
||
, hashMode ? "flat"
|
||
}:
|
||
assert (message != null) || (url != null);
|
||
assert (sha256 != null) || (sha1 != null) || (hash != null);
|
||
assert (name != null) || (url != null);
|
||
let
|
||
msg =
|
||
if message != null then message
|
||
else ''
|
||
Unfortunately, we cannot download file ${name_} automatically.
|
||
Please go to ${url} to download it yourself, and add it to the Nix store
|
||
using either
|
||
nix-store --add-fixed ${hashAlgo} ${name_}
|
||
or
|
||
nix-prefetch-url --type ${hashAlgo} file:///path/to/${name_}
|
||
'';
|
||
hashAlgo =
|
||
if hash != null then (builtins.head (lib.strings.splitString "-" hash))
|
||
else if sha256 != null then "sha256"
|
||
else "sha1";
|
||
hashAlgo_ = if hash != null then "" else hashAlgo;
|
||
hash_ =
|
||
if hash != null then hash
|
||
else if sha256 != null then sha256
|
||
else sha1;
|
||
name_ = if name == null then baseNameOf (toString url) else name;
|
||
in
|
||
stdenvNoCC.mkDerivation {
|
||
name = name_;
|
||
outputHashMode = hashMode;
|
||
outputHashAlgo = hashAlgo_;
|
||
outputHash = hash_;
|
||
preferLocalBuild = true;
|
||
allowSubstitutes = false;
|
||
builder = writeScript "restrict-message" ''
|
||
source ${stdenvNoCC}/setup
|
||
cat <<_EOF_
|
||
|
||
***
|
||
${msg}
|
||
***
|
||
|
||
_EOF_
|
||
exit 1
|
||
'';
|
||
};
|
||
|
||
|
||
# TODO: move copyPathToStore docs to the Nixpkgs manual
|
||
/*
|
||
Copy a path to the Nix store.
|
||
Nix automatically copies files to the store before stringifying paths.
|
||
If you need the store path of a file, ${copyPathToStore <path>} can be
|
||
shortened to ${<path>}.
|
||
*/
|
||
copyPathToStore = builtins.filterSource (p: t: true);
|
||
|
||
|
||
# TODO: move copyPathsToStore docs to the Nixpkgs manual
|
||
/*
|
||
Copy a list of paths to the Nix store.
|
||
*/
|
||
copyPathsToStore = builtins.map copyPathToStore;
|
||
|
||
# TODO: move applyPatches docs to the Nixpkgs manual
|
||
/* Applies a list of patches to a source directory.
|
||
|
||
Example:
|
||
|
||
# Patching nixpkgs:
|
||
|
||
applyPatches {
|
||
src = pkgs.path;
|
||
patches = [
|
||
(pkgs.fetchpatch {
|
||
url = "https://github.com/NixOS/nixpkgs/commit/1f770d20550a413e508e081ddc08464e9d08ba3d.patch";
|
||
sha256 = "1nlzx171y3r3jbk0qhvnl711kmdk57jlq4na8f8bs8wz2pbffymr";
|
||
})
|
||
];
|
||
}
|
||
|
||
*/
|
||
applyPatches =
|
||
{ src
|
||
, name ? (if builtins.typeOf src == "path"
|
||
then builtins.baseNameOf src
|
||
else
|
||
if builtins.isAttrs src && builtins.hasAttr "name" src
|
||
then src.name
|
||
else throw "applyPatches: please supply a `name` argument because a default name can only be computed when the `src` is a path or is an attribute set with a `name` attribute."
|
||
) + "-patched"
|
||
, patches ? [ ]
|
||
, prePatch ? ""
|
||
, postPatch ? ""
|
||
, ...
|
||
}@args:
|
||
if patches == [ ] && prePatch == "" && postPatch == ""
|
||
then src # nothing to do, so use original src to avoid additional drv
|
||
else stdenvNoCC.mkDerivation
|
||
({
|
||
inherit name src patches prePatch postPatch;
|
||
preferLocalBuild = true;
|
||
allowSubstitutes = false;
|
||
phases = "unpackPhase patchPhase installPhase";
|
||
installPhase = "cp -R ./ $out";
|
||
}
|
||
# Carry `meta` information from the underlying `src` if present.
|
||
// (optionalAttrs (src?meta) { inherit (src) meta; })
|
||
// (removeAttrs args [ "src" "name" "patches" "prePatch" "postPatch" ]));
|
||
|
||
# TODO: move docs to Nixpkgs manual
|
||
/* An immutable file in the store with a length of 0 bytes. */
|
||
emptyFile = runCommand "empty-file"
|
||
{
|
||
outputHash = "sha256-d6xi4mKdjkX2JFicDIv5niSzpyI0m/Hnm8GGAIU04kY=";
|
||
outputHashMode = "recursive";
|
||
preferLocalBuild = true;
|
||
} "touch $out";
|
||
|
||
# TODO: move docs to Nixpkgs manual
|
||
/* An immutable empty directory in the store. */
|
||
emptyDirectory = runCommand "empty-directory"
|
||
{
|
||
outputHashAlgo = "sha256";
|
||
outputHashMode = "recursive";
|
||
outputHash = "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5";
|
||
preferLocalBuild = true;
|
||
} "mkdir $out";
|
||
}
|