Merge pull request #267294 from fricklerhandwerk/note-trivial-builders
doc: add note on which variables are effective for `runCommand`
This commit is contained in:
Valentin Gagarin
GitHub
commit
4f3be8a70a
1 changed files with 227 additions and 202 deletions
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@ -9,31 +9,41 @@ in
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rec {
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/* Run the shell command `buildCommand' to produce a store path named
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`name'. The attributes in `env' are added to the environment
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prior to running the command. By default `runCommand` runs in a
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stdenv with no compiler environment. `runCommandCC` uses the default
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stdenv, `pkgs.stdenv`.
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/*
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Run the shell command `buildCommand' to produce a store path named `name'.
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Example:
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The attributes in `env' are added to the environment prior to running the command.
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Environment variables set by `stdenv.mkDerivation` take precedence.
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By default `runCommand` runs in a stdenv with no compiler environment.
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`runCommandCC` uses the default stdenv, `pkgs.stdenv`.
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runCommand "name" {envVariable = true;} ''echo hello > $out''
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runCommandCC "name" {} ''gcc -o myfile myfile.c; cp myfile $out'';
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Example:
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```nix
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runCommand "name" {envVariable = true;} ''echo hello > $out'';
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```
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The `*Local` variants force a derivation to be built locally,
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it is not substituted.
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```nix
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runCommandCC "name" {} ''gcc -o myfile myfile.c; cp myfile $out'';
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```
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This is intended for very cheap commands (<1s execution time).
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It saves on the network roundrip and can speed up a build.
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The `*Local` variants force a derivation to be built locally,
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it is not substituted.
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It is the same as adding the special fields
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This is intended for very cheap commands (<1s execution time).
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It saves on the network roundrip and can speed up a build.
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`preferLocalBuild = true;`
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`allowSubstitutes = false;`
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It is the same as adding the special fields
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to a derivation’s attributes.
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```nix
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{
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preferLocalBuild = true;
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allowSubstitutes = false;
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}
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```
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to a derivation’s attributes.
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*/
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runCommand = name: env: runCommandWith {
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stdenv = stdenvNoCC;
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@ -57,7 +67,8 @@ rec {
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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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/* Generalized version of the `runCommand`-variants
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/*
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Generalized version of the `runCommand`-variants
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which does customized behavior via a single
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attribute set passed as the first argument
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instead of having a lot of variants like
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@ -72,36 +83,37 @@ rec {
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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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# 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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# 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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# 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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# 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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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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/* Writes a text file to the nix store.
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/*
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Writes a text file to the nix store.
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The contents of text is added to the file in the store.
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Example:
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@ -145,11 +157,13 @@ rec {
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matches = builtins.match "/bin/([^/]+)" destination;
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in
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runCommand name
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{ inherit text executable checkPhase allowSubstitutes preferLocalBuild;
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{
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inherit text executable checkPhase allowSubstitutes preferLocalBuild;
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passAsFile = [ "text" ];
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meta = lib.optionalAttrs (executable && matches != null) {
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mainProgram = lib.head matches;
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} // meta;
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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;
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}
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''
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target=$out${lib.escapeShellArg destination}
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@ -169,20 +183,20 @@ rec {
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'';
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/*
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Writes a text file to nix store with no optional parameters available.
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Writes a text file to nix store with no optional parameters available.
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Example:
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Example:
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# Writes contents of file to /nix/store/<store path>
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writeText "my-file"
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# Writes contents of file to /nix/store/<store path>
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writeText "my-file"
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''
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Contents of File
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'';
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*/
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writeText = name: text: writeTextFile {inherit name text;};
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writeText = name: text: writeTextFile { inherit name text; };
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/*
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Writes a text file to nix store in a specific directory with no
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@ -224,7 +238,7 @@ rec {
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*/
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writeScript = name: text: writeTextFile {inherit name text; executable = true;};
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writeScript = name: text: writeTextFile { inherit name text; executable = true; };
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/*
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Writes a text file to /nix/store/<store path>/bin/<name> and
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@ -270,7 +284,7 @@ rec {
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text = ''
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#!${runtimeShell}
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${text}
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'';
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'';
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checkPhase = ''
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${stdenv.shellDryRun} "$target"
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'';
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@ -292,7 +306,7 @@ rec {
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*/
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writeShellScriptBin = name : text :
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writeShellScriptBin = name: text:
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writeTextFile {
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inherit name;
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executable = true;
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@ -300,7 +314,7 @@ rec {
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text = ''
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#!${runtimeShell}
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${text}
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'';
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'';
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checkPhase = ''
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${stdenv.shellDryRun} "$target"
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'';
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@ -340,7 +354,7 @@ rec {
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, runtimeInputs ? [ ]
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, meta ? { }
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, checkPhase ? null
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, excludeShellChecks ? [ ]
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, excludeShellChecks ? [ ]
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}:
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writeTextFile {
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inherit name meta;
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@ -366,7 +380,7 @@ rec {
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# but we still want to use writeShellApplication on those platforms
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let
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shellcheckSupported = lib.meta.availableOn stdenv.buildPlatform shellcheck-minimal.compiler;
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excludeOption = lib.optionalString (excludeShellChecks != [ ]) "--exclude '${lib.concatStringsSep "," excludeShellChecks}'";
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excludeOption = lib.optionalString (excludeShellChecks != [ ]) "--exclude '${lib.concatStringsSep "," excludeShellChecks}'";
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shellcheckCommand = lib.optionalString shellcheckSupported ''
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# use shellcheck which does not include docs
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# pandoc takes long to build and documentation isn't needed for just running the cli
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@ -385,23 +399,23 @@ rec {
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# Create a C binary
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writeCBin = pname: code:
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runCommandCC pname
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{
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inherit pname code;
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executable = true;
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passAsFile = ["code"];
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# Pointless to do this on a remote machine.
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preferLocalBuild = true;
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allowSubstitutes = false;
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meta = {
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mainProgram = pname;
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};
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}
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''
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n=$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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{
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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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/* concat a list of files to the nix store.
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@ -532,19 +546,20 @@ rec {
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*/
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symlinkJoin =
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args_@{ name
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, paths
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, preferLocalBuild ? true
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, allowSubstitutes ? false
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, postBuild ? ""
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, ...
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}:
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, paths
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, preferLocalBuild ? true
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, allowSubstitutes ? false
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, postBuild ? ""
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, ...
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}:
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let
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args = removeAttrs args_ [ "name" "postBuild" ]
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// {
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inherit preferLocalBuild allowSubstitutes;
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passAsFile = [ "paths" ];
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}; # pass the defaults
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in runCommand name args
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inherit preferLocalBuild allowSubstitutes;
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passAsFile = [ "paths" ];
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}; # pass the defaults
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in
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runCommand name args
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''
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mkdir -p $out
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for i in $(cat $pathsPath); do
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@ -584,27 +599,30 @@ rec {
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See the note on symlinkJoin for the difference between linkFarm and symlinkJoin.
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*/
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linkFarm = name: entries:
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let
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entries' =
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if (lib.isAttrs entries) then entries
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# We do this foldl to have last-wins semantics in case of repeated entries
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else if (lib.isList entries) then lib.foldl (a: b: a // { "${b.name}" = b.path; }) { } entries
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else throw "linkFarm entries must be either attrs or a list!";
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let
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entries' =
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if (lib.isAttrs entries) then entries
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# We do this foldl to have last-wins semantics in case of repeated entries
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else if (lib.isList entries) then lib.foldl (a: b: a // { "${b.name}" = b.path; }) { } entries
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else throw "linkFarm entries must be either attrs or a list!";
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linkCommands = lib.mapAttrsToList (name: path: ''
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mkdir -p "$(dirname ${lib.escapeShellArg "${name}"})"
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ln -s ${lib.escapeShellArg "${path}"} ${lib.escapeShellArg "${name}"}
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'') entries';
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in
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runCommand name {
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preferLocalBuild = true;
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allowSubstitutes = false;
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passthru.entries = entries';
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} ''
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mkdir -p $out
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cd $out
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${lib.concatStrings linkCommands}
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'';
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linkCommands = lib.mapAttrsToList
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(name: path: ''
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mkdir -p "$(dirname ${lib.escapeShellArg "${name}"})"
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ln -s ${lib.escapeShellArg "${path}"} ${lib.escapeShellArg "${name}"}
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'')
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entries';
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in
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runCommand name
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{
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preferLocalBuild = true;
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allowSubstitutes = false;
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passthru.entries = entries';
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} ''
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mkdir -p $out
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cd $out
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${lib.concatStrings linkCommands}
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'';
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/*
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Easily create a linkFarm from a set of derivations.
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@ -639,7 +657,7 @@ rec {
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bin output and other contents of the package's output (e.g. setup
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hooks) cause trouble when used in your environment.
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*/
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onlyBin = drv: runCommand "${drv.name}-only-bin" {} ''
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onlyBin = drv: runCommand "${drv.name}-only-bin" { } ''
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mkdir -p $out
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ln -s ${lib.getBin drv}/bin $out/bin
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'';
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@ -675,14 +693,14 @@ rec {
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# TODO 2023-01, no backport: simplify to inherit passthru;
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passthru = passthru
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// optionalAttrs (substitutions?passthru)
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(warn "makeSetupHook (name = ${lib.strings.escapeNixString name}): `substitutions.passthru` is deprecated. Please set `passthru` directly."
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substitutions.passthru);
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(warn "makeSetupHook (name = ${lib.strings.escapeNixString name}): `substitutions.passthru` is deprecated. Please set `passthru` directly."
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substitutions.passthru);
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})
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(''
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mkdir -p $out/nix-support
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cp ${script} $out/nix-support/setup-hook
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recordPropagatedDependencies
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'' + lib.optionalString (substitutions != {}) ''
|
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'' + lib.optionalString (substitutions != { }) ''
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substituteAll ${script} $out/nix-support/setup-hook
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'');
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|
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@ -691,7 +709,7 @@ rec {
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|||
|
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writeReferencesToFile = path: runCommand "runtime-deps"
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{
|
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exportReferencesGraph = ["graph" path];
|
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exportReferencesGraph = [ "graph" path ];
|
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}
|
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''
|
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touch $out
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|
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@ -710,7 +728,7 @@ rec {
|
|||
*/
|
||||
writeDirectReferencesToFile = path: runCommand "runtime-references"
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{
|
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exportReferencesGraph = ["graph" path];
|
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exportReferencesGraph = [ "graph" path ];
|
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inherit path;
|
||||
}
|
||||
''
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||||
|
|
@ -744,17 +762,17 @@ rec {
|
|||
*/
|
||||
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.
|
||||
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
|
||||
|
|
@ -798,21 +816,21 @@ rec {
|
|||
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)
|
||||
# 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);
|
||||
if builtins ? getContext then
|
||||
writeText "string-references" allPathsWithContext
|
||||
else
|
||||
writeDirectReferencesToFile (writeText "string-file" string);
|
||||
|
||||
|
||||
/* Print an error message if the file with the specified name and
|
||||
|
|
@ -830,55 +848,59 @@ rec {
|
|||
}
|
||||
|
||||
*/
|
||||
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_
|
||||
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}
|
||||
***
|
||||
***
|
||||
${msg}
|
||||
***
|
||||
|
||||
_EOF_
|
||||
exit 1
|
||||
'';
|
||||
};
|
||||
_EOF_
|
||||
exit 1
|
||||
'';
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
|
|
@ -915,39 +937,42 @@ rec {
|
|||
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 ? []
|
||||
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 ? [ ]
|
||||
, postPatch ? ""
|
||||
, ...
|
||||
}@args: stdenvNoCC.mkDerivation {
|
||||
inherit name src patches postPatch;
|
||||
preferLocalBuild = true;
|
||||
allowSubstitutes = false;
|
||||
phases = "unpackPhase patchPhase installPhase";
|
||||
installPhase = "cp -R ./ $out";
|
||||
}
|
||||
}@args: stdenvNoCC.mkDerivation
|
||||
{
|
||||
inherit name src patches 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" "postPatch" ]);
|
||||
|
||||
/* An immutable file in the store with a length of 0 bytes. */
|
||||
emptyFile = runCommand "empty-file" {
|
||||
outputHashAlgo = "sha256";
|
||||
outputHashMode = "recursive";
|
||||
outputHash = "0ip26j2h11n1kgkz36rl4akv694yz65hr72q4kv4b3lxcbi65b3p";
|
||||
preferLocalBuild = true;
|
||||
} "touch $out";
|
||||
emptyFile = runCommand "empty-file"
|
||||
{
|
||||
outputHashAlgo = "sha256";
|
||||
outputHashMode = "recursive";
|
||||
outputHash = "0ip26j2h11n1kgkz36rl4akv694yz65hr72q4kv4b3lxcbi65b3p";
|
||||
preferLocalBuild = true;
|
||||
} "touch $out";
|
||||
|
||||
/* An immutable empty directory in the store. */
|
||||
emptyDirectory = runCommand "empty-directory" {
|
||||
outputHashAlgo = "sha256";
|
||||
outputHashMode = "recursive";
|
||||
outputHash = "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5";
|
||||
preferLocalBuild = true;
|
||||
} "mkdir $out";
|
||||
emptyDirectory = runCommand "empty-directory"
|
||||
{
|
||||
outputHashAlgo = "sha256";
|
||||
outputHashMode = "recursive";
|
||||
outputHash = "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5";
|
||||
preferLocalBuild = true;
|
||||
} "mkdir $out";
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue