506 lines
16 KiB
Nix
506 lines
16 KiB
Nix
{ lib, stdenv, stdenvNoCC, lndir, runtimeShell }:
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let
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runCommand' = runLocal: stdenv: name: env: buildCommand:
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stdenv.mkDerivation ({
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name = lib.strings.sanitizeDerivationName name;
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inherit buildCommand;
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passAsFile = [ "buildCommand" ];
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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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// env);
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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 using
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* stdenv with no compiler environment. `runCommandCC`
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*
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* Examples:
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* runCommand "name" {envVariable = true;} ''echo hello > $out''
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* runCommandNoCC "name" {envVariable = true;} ''echo hello > $out'' # equivalent to prior
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* runCommandCC "name" {} ''gcc -o myfile myfile.c; cp myfile $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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*
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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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*
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* It is the same as adding the special fields
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* `preferLocalBuild = true;`
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* `allowSubstitutes = false;`
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* to a derivation’s attributes.
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*/
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runCommand = runCommandNoCC;
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runCommandLocal = runCommandNoCCLocal;
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runCommandNoCC = runCommand' false stdenvNoCC;
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runCommandNoCCLocal = runCommand' true stdenvNoCC;
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runCommandCC = runCommand' false stdenv;
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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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/* 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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*
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* Examples:
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* # Writes my-file to /nix/store/<store path>
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* writeTextFile {
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* name = "my-file";
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* text = ''
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* Contents of File
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* '';
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* }
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* # See also the `writeText` helper function below.
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*
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* # Writes executable my-file to /nix/store/<store path>/bin/my-file
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* writeTextFile {
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* name = "my-file";
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* text = ''
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* Contents of File
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* '';
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* executable = true;
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* destination = "/bin/my-file";
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* }
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*/
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writeTextFile =
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{ name # the name of the derivation
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, text
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, executable ? false # run chmod +x ?
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, destination ? "" # relative path appended to $out eg "/bin/foo"
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, checkPhase ? "" # syntax checks, e.g. for scripts
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}:
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runCommand name
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{ inherit text executable;
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passAsFile = [ "text" ];
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# Pointless to do this on a remote machine.
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preferLocalBuild = true;
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allowSubstitutes = false;
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}
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''
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n=$out${destination}
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mkdir -p "$(dirname "$n")"
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if [ -e "$textPath" ]; then
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mv "$textPath" "$n"
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else
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echo -n "$text" > "$n"
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fi
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${checkPhase}
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(test -n "$executable" && chmod +x "$n") || true
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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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*
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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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* ''
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* Contents of File
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* '';
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*
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*/
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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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* optional parameters available.
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*
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* Example:
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* # Writes contents of file to /nix/store/<store path>/share/my-file
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* writeTextDir "share/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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*/
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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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/*
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* Writes a text file to /nix/store/<store path> and marks the file as
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* executable.
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*
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* If passed as a build input, will be used as a setup hook. This makes setup
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* hooks more efficient to create: you don't need a derivation that copies
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* them to $out/nix-support/setup-hook, instead you can use the file as is.
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*
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* Example:
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* # Writes my-file to /nix/store/<store path> and makes executable
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* writeScript "my-file"
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* ''
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* Contents of File
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* '';
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*
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*/
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writeScript = name: text: writeTextFile {inherit name text; executable = true;};
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/*
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* Writes a text file to /nix/store/<store path>/bin/<name> and
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* marks the file as executable.
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*
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* Example:
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* # Writes my-file to /nix/store/<store path>/bin/my-file and makes executable.
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* writeScriptBin "my-file"
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* ''
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* Contents of File
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* '';
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*
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*/
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writeScriptBin = name: text: writeTextFile {inherit name text; executable = true; destination = "/bin/${name}";};
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/*
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* Similar to writeScript. Writes a Shell script and checks its syntax.
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* Automatically includes interpreter above the contents passed.
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*
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* Example:
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* # Writes my-file to /nix/store/<store path> and makes executable.
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* writeShellScript "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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*/
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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.shell} -n $out
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'';
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};
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/*
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* Similar to writeShellScript and writeScriptBin.
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* Writes an executable Shell script to /nix/store/<store path>/bin/<name> and checks its syntax.
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* Automatically includes interpreter above the contents passed.
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*
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* Example:
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* # Writes my-file to /nix/store/<store path>/bin/my-file and makes executable.
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* writeShellScriptBin "my-file"
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* ''
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* Contents of File
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* '';
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*
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*/
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writeShellScriptBin = name : text :
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writeTextFile {
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inherit name;
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executable = true;
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destination = "/bin/${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.shell} -n $out/bin/${name}
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'';
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};
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# Create a C binary
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writeCBin = name: code:
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runCommandCC name
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{
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inherit name 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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}
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''
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n=$out/bin/$name
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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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* Create a forest of symlinks to the files in `paths'.
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*
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* This creates a single derivation that replicates the directory structure
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* of all the input paths.
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*
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* Examples:
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* # adds symlinks of hello to current build.
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* symlinkJoin { name = "myhello"; paths = [ pkgs.hello ]; }
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*
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* # adds symlinks of hello and stack to current build and prints "links added"
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* symlinkJoin { name = "myexample"; paths = [ pkgs.hello pkgs.stack ]; postBuild = "echo links added"; }
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*
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* This creates a derivation with a directory structure like the following:
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*
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* /nix/store/sglsr5g079a5235hy29da3mq3hv8sjmm-myexample
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* |-- bin
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* | |-- hello -> /nix/store/qy93dp4a3rqyn2mz63fbxjg228hffwyw-hello-2.10/bin/hello
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* | `-- stack -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/bin/stack
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* `-- share
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* |-- bash-completion
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* | `-- completions
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* | `-- stack -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/share/bash-completion/completions/stack
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* |-- fish
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* | `-- vendor_completions.d
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* | `-- stack.fish -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1/share/fish/vendor_completions.d/stack.fish
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* ...
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*
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* symlinkJoin and linkFarm are similar functions, but they output
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* derivations with different structure.
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*
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* symlinkJoin is used to create a derivation with a familiar directory
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* structure (top-level bin/, share/, etc), but with all actual files being symlinks to
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* the files in the input derivations.
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*
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* symlinkJoin is used many places in nixpkgs to create a single derivation
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* that appears to contain binaries, libraries, documentation, etc from
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* multiple input derivations.
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*
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* linkFarm is instead used to create a simple derivation with symlinks to
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* other derivations. A derivation created with linkFarm is often used in CI
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* as a easy way to build multiple derivations at once.
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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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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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''
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mkdir -p $out
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for i in $(cat $pathsPath); do
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${lndir}/bin/lndir -silent $i $out
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done
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${postBuild}
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'';
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/*
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* Quickly create a set of symlinks to derivations.
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*
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* This creates a simple derivation with symlinks to all inputs.
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*
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* entries is a list of attribute sets like
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* { name = "name" ; path = "/nix/store/..."; }
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*
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* Example:
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*
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* # Symlinks hello and stack paths in store to current $out/hello-test and
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* # $out/foobar.
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* linkFarm "myexample" [ { name = "hello-test"; path = pkgs.hello; } { name = "foobar"; path = pkgs.stack; } ]
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*
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* This creates a derivation with a directory structure like the following:
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*
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* /nix/store/qc5728m4sa344mbks99r3q05mymwm4rw-myexample
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* |-- foobar -> /nix/store/6lzdpxshx78281vy056lbk553ijsdr44-stack-2.1.3.1
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* `-- hello-test -> /nix/store/qy93dp4a3rqyn2mz63fbxjg228hffwyw-hello-2.10
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*
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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: runCommand name { preferLocalBuild = true; allowSubstitutes = false; }
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''mkdir -p $out
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cd $out
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${lib.concatMapStrings (x: ''
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mkdir -p "$(dirname ${lib.escapeShellArg x.name})"
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ln -s ${lib.escapeShellArg x.path} ${lib.escapeShellArg x.name}
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'') entries}
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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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*
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* This calls linkFarm with a list of entries created from the list of input
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* derivations. It turns each input derivation into an attribute set
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* like { name = drv.name ; path = drv }, and passes this to linkFarm.
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*
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* Example:
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*
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* # Symlinks the hello, gcc, and ghc derivations in $out
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* linkFarmFromDrvs "myexample" [ pkgs.hello pkgs.gcc pkgs.ghc ]
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*
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* This creates a derivation with a directory structure like the following:
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*
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* /nix/store/m3s6wkjy9c3wy830201bqsb91nk2yj8c-myexample
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* |-- gcc-wrapper-9.2.0 -> /nix/store/fqhjxf9ii4w4gqcsx59fyw2vvj91486a-gcc-wrapper-9.2.0
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* |-- ghc-8.6.5 -> /nix/store/gnf3s07bglhbbk4y6m76sbh42siym0s6-ghc-8.6.5
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* `-- hello-2.10 -> /nix/store/k0ll91c4npk4lg8lqhx00glg2m735g74-hello-2.10
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*/
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linkFarmFromDrvs = name: drvs:
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let mkEntryFromDrv = drv: { name = drv.name; path = drv; };
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in linkFarm name (map mkEntryFromDrv drvs);
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/*
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* Make a package that just contains a setup hook with the given contents.
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* This setup hook will be invoked by any package that includes this package
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* as a buildInput. Optionally takes a list of substitutions that should be
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* applied to the resulting script.
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*
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* Examples:
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* # setup hook that depends on the hello package and runs ./myscript.sh
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* myhellohook = makeSetupHook { deps = [ hello ]; } ./myscript.sh;
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*
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* # wrotes a setup hook where @bash@ myscript.sh is substituted for the
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* # bash interpreter.
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* myhellohookSub = makeSetupHook {
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* deps = [ hello ];
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* substitutions = { bash = "${pkgs.bash}/bin/bash"; };
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* } ./myscript.sh;
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*/
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makeSetupHook = { name ? "hook", deps ? [], substitutions ? {} }: script:
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runCommand name substitutions
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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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'' + lib.optionalString (deps != []) ''
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printWords ${toString deps} > $out/nix-support/propagated-build-inputs
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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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# Write the references (i.e. the runtime dependencies in the Nix store) of `path' to a file.
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writeReferencesToFile = path: runCommand "runtime-deps"
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{
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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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while read path; do
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echo $path >> $out
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read dummy
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read nrRefs
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for ((i = 0; i < nrRefs; i++)); do read ref; done
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done < graph
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'';
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/* Print an error message if the file with the specified name and
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* hash doesn't exist in the Nix store. This function should only
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* be used by non-redistributable software with an unfree license
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* that we need to require the user to download manually. It produces
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* packages that cannot be built automatically.
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*
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* Examples:
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*
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* requireFile {
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* name = "my-file";
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* url = "http://example.com/download/";
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* sha256 = "ffffffffffffffffffffffffffffffffffffffffffffffffffff";
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* }
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*/
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requireFile = { name ? null
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, sha256 ? null
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, sha1 ? null
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, url ? null
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, message ? null
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, hashMode ? "flat"
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} :
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assert (message != null) || (url != null);
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assert (sha256 != null) || (sha1 != null);
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assert (name != null) || (url != null);
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let msg =
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if message != null then message
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else ''
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Unfortunately, we cannot download file ${name_} automatically.
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Please go to ${url} to download it yourself, and add it to the Nix store
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using either
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nix-store --add-fixed ${hashAlgo} ${name_}
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or
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nix-prefetch-url --type ${hashAlgo} file:///path/to/${name_}
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'';
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hashAlgo = if sha256 != null then "sha256" else "sha1";
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hash = if sha256 != null then sha256 else sha1;
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name_ = if name == null then baseNameOf (toString url) else name;
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in
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stdenvNoCC.mkDerivation {
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name = name_;
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outputHashMode = hashMode;
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outputHashAlgo = hashAlgo;
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outputHash = hash;
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preferLocalBuild = true;
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allowSubstitutes = false;
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builder = writeScript "restrict-message" ''
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source ${stdenvNoCC}/setup
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cat <<_EOF_
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***
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${msg}
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***
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_EOF_
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exit 1
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'';
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};
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# Copy a path to the Nix store.
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# Nix automatically copies files to the store before stringifying paths.
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# If you need the store path of a file, ${copyPathToStore <path>} can be
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# shortened to ${<path>}.
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copyPathToStore = builtins.filterSource (p: t: true);
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# Copy a list of paths to the Nix store.
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copyPathsToStore = builtins.map copyPathToStore;
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/* Applies a list of patches to a source directory.
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*
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* Examples:
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*
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* # Patching nixpkgs:
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* applyPatches {
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* src = pkgs.path;
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* patches = [
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* (pkgs.fetchpatch {
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* url = "https://github.com/NixOS/nixpkgs/commit/1f770d20550a413e508e081ddc08464e9d08ba3d.patch";
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* sha256 = "1nlzx171y3r3jbk0qhvnl711kmdk57jlq4na8f8bs8wz2pbffymr";
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* })
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* ];
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* }
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*/
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applyPatches =
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{ src
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, name ? (if builtins.typeOf src == "path"
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then builtins.baseNameOf src
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else
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if builtins.isAttrs src && builtins.hasAttr "name" src
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then src.name
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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."
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) + "-patched"
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, patches ? []
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, postPatch ? ""
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}: stdenvNoCC.mkDerivation {
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inherit name src patches postPatch;
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preferLocalBuild = true;
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allowSubstitutes = false;
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phases = "unpackPhase patchPhase installPhase";
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installPhase = "cp -R ./ $out";
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};
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}
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