{ lib, stdenv, stdenvNoCC, lndir, runtimeShell, shellcheck }: rec { /* Run the shell command `buildCommand' to produce a store path named * `name'. The attributes in `env' are added to the environment * prior to running the command. By default `runCommand` runs in a * stdenv with no compiler environment. `runCommandCC` uses the default * stdenv, `pkgs.stdenv`. * * Examples: * runCommand "name" {envVariable = true;} ''echo hello > $out'' * runCommandNoCC "name" {envVariable = true;} ''echo hello > $out'' # equivalent to prior * runCommandCC "name" {} ''gcc -o myfile myfile.c; cp myfile $out''; * * The `*Local` variants force a derivation to be built locally, * it is not substituted. * * This is intended for very cheap commands (<1s execution time). * It saves on the network roundrip and can speed up a build. * * It is the same as adding the special fields * `preferLocalBuild = true;` * `allowSubstitutes = false;` * to a derivation’s attributes. */ runCommand = name: env: runCommandWith { stdenv = stdenvNoCC; runLocal = false; inherit name; derivationArgs = env; }; runCommandLocal = name: env: runCommandWith { stdenv = stdenvNoCC; runLocal = true; inherit name; derivationArgs = env; }; runCommandCC = name: env: runCommandWith { stdenv = stdenv; runLocal = false; inherit name; derivationArgs = env; }; # `runCommandCCLocal` left out on purpose. # We shouldn’t force the user to have a cc in scope. /* Generalized version of the `runCommand`-variants * which does customized behavior via a single * attribute set passed as the first argument * instead of having a lot of variants like * `runCommand*`. Additionally it allows changing * the used `stdenv` freely and has a more explicit * approach to changing the arguments passed to * `stdenv.mkDerivation`. */ runCommandWith = let # prevent infinite recursion for the default stdenv value defaultStdenv = stdenv; in { stdenv ? defaultStdenv # which stdenv to use, defaults to a stdenv with a C compiler, pkgs.stdenv , runLocal ? false # whether to build this derivation locally instead of substituting , derivationArgs ? {} # extra arguments to pass to stdenv.mkDerivation , name # name of the resulting derivation }: buildCommand: stdenv.mkDerivation ({ inherit buildCommand name; passAsFile = [ "buildCommand" ] ++ (derivationArgs.passAsFile or []); } // (lib.optionalAttrs runLocal { preferLocalBuild = true; allowSubstitutes = false; }) // builtins.removeAttrs derivationArgs [ "passAsFile" ]); /* Writes a text file to the nix store. * The contents of text is added to the file in the store. * * Examples: * # Writes my-file to /nix/store/ * writeTextFile { * name = "my-file"; * text = '' * Contents of File * ''; * } * # See also the `writeText` helper function below. * * # Writes executable my-file to /nix/store//bin/my-file * writeTextFile { * name = "my-file"; * text = '' * Contents of File * ''; * executable = true; * destination = "/bin/my-file"; * } */ writeTextFile = { name # the name of the derivation , text , executable ? false # run chmod +x ? , destination ? "" # relative path appended to $out eg "/bin/foo" , checkPhase ? "" # syntax checks, e.g. for scripts , meta ? { } }: runCommand name { inherit text executable checkPhase meta; passAsFile = [ "text" ]; # Pointless to do this on a remote machine. preferLocalBuild = true; allowSubstitutes = false; } '' target=$out${lib.escapeShellArg destination} mkdir -p "$(dirname "$target")" if [ -e "$textPath" ]; then mv "$textPath" "$target" else echo -n "$text" > "$target" fi eval "$checkPhase" (test -n "$executable" && chmod +x "$target") || true ''; /* * Writes a text file to nix store with no optional parameters available. * * Example: * # Writes contents of file to /nix/store/ * writeText "my-file" * '' * Contents of File * ''; * */ writeText = name: text: writeTextFile {inherit name text;}; /* * Writes a text file to nix store in a specific directory with no * optional parameters available. * * Example: * # Writes contents of file to /nix/store//share/my-file * writeTextDir "share/my-file" * '' * Contents of File * ''; * */ writeTextDir = path: text: writeTextFile { inherit text; name = builtins.baseNameOf path; destination = "/${path}"; }; /* * Writes a text file to /nix/store/ and marks the file as * executable. * * If passed as a build input, will be used as a setup hook. This makes setup * hooks more efficient to create: you don't need a derivation that copies * them to $out/nix-support/setup-hook, instead you can use the file as is. * * Example: * # Writes my-file to /nix/store/ and makes executable * writeScript "my-file" * '' * Contents of File * ''; * */ writeScript = name: text: writeTextFile {inherit name text; executable = true;}; /* * Writes a text file to /nix/store//bin/ and * marks the file as executable. * * Example: * # Writes my-file to /nix/store//bin/my-file and makes executable. * writeScriptBin "my-file" * '' * Contents of File * ''; * */ writeScriptBin = name: text: writeTextFile {inherit name text; executable = true; destination = "/bin/${name}";}; /* * Similar to writeScript. Writes a Shell script and checks its syntax. * Automatically includes interpreter above the contents passed. * * Example: * # Writes my-file to /nix/store/ and makes executable. * writeShellScript "my-file" * '' * Contents of File * ''; * */ writeShellScript = name: text: writeTextFile { inherit name; executable = true; text = '' #!${runtimeShell} ${text} ''; checkPhase = '' ${stdenv.shellDryRun} "$target" ''; }; /* * Similar to writeShellScript and writeScriptBin. * Writes an executable Shell script to /nix/store//bin/ and checks its syntax. * Automatically includes interpreter above the contents passed. * * Example: * # Writes my-file to /nix/store//bin/my-file and makes executable. * writeShellScriptBin "my-file" * '' * Contents of File * ''; * */ writeShellScriptBin = name : text : writeTextFile { inherit name; executable = true; destination = "/bin/${name}"; text = '' #!${runtimeShell} ${text} ''; checkPhase = '' ${stdenv.shellDryRun} "$target" ''; }; /* * Similar to writeShellScriptBin and writeScriptBin. * Writes an executable Shell script to /nix/store//bin/ and * checks its syntax with shellcheck and the shell's -n option. * Automatically includes sane set of shellopts (errexit, nounset, pipefail) * and handles creation of PATH based on runtimeInputs * * Note that the checkPhase uses stdenv.shell for the test run of the script, * while the generated shebang uses runtimeShell. If, for whatever reason, * those were to mismatch you might lose fidelity in the default checks. * * Example: * # Writes my-file to /nix/store//bin/my-file and makes executable. * writeShellApplication { * name = "my-file"; * runtimeInputs = [ curl w3m ]; * text = '' * curl -s 'https://nixos.org' | w3m -dump -T text/html * ''; * } */ writeShellApplication = { name , text , runtimeInputs ? [ ] , checkPhase ? null }: writeTextFile { inherit name; executable = true; destination = "/bin/${name}"; text = '' #!${runtimeShell} set -o errexit set -o nounset set -o pipefail export PATH="${lib.makeBinPath runtimeInputs}:$PATH" ${text} ''; checkPhase = if checkPhase == null then '' runHook preCheck ${stdenv.shellDryRun} "$target" ${shellcheck}/bin/shellcheck "$target" runHook postCheck '' else checkPhase; meta.mainProgram = name; }; # Create a C binary writeCBin = name: code: runCommandCC name { inherit name code; executable = true; passAsFile = ["code"]; # Pointless to do this on a remote machine. preferLocalBuild = true; allowSubstitutes = false; } '' n=$out/bin/$name mkdir -p "$(dirname "$n")" mv "$codePath" code.c $CC -x c code.c -o "$n" ''; /* concat a list of files to the nix store. * The contents of files are added to the file in the store. * * Examples: * # Writes my-file to /nix/store/ * concatTextFile { * name = "my-file"; * files = [ drv1 "${drv2}/path/to/file" ]; * } * # See also the `concatText` helper function below. * * # Writes executable my-file to /nix/store//bin/my-file * concatTextFile { * name = "my-file"; * files = [ drv1 "${drv2}/path/to/file" ]; * executable = true; * destination = "/bin/my-file"; * } */ concatTextFile = { name # the name of the derivation , files , executable ? false # run chmod +x ? , 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" (test -n "$executable" && chmod +x "$file") || true eval "$checkPhase" ''; /* * Writes a text file to nix store with no optional parameters available. * * Example: * # Writes contents of files to /nix/store/ * concatText "my-file" [ file1 file2 ] * */ concatText = name: files: concatTextFile { inherit name files; }; /* * Writes a text file to nix store with and mark it as executable. * * Example: * # Writes contents of files to /nix/store/ * concatScript "my-file" [ file1 file2 ] * */ concatScript = name: files: concatTextFile { inherit name files; executable = true; }; /* * 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. * * Examples: * # 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} ''; /* * Quickly create a set of symlinks to derivations. * * This creates a simple derivation with symlinks to all inputs. * * entries is a list of attribute sets like * { name = "name" ; path = "/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: runCommand name { preferLocalBuild = true; allowSubstitutes = false; } ''mkdir -p $out cd $out ${lib.concatMapStrings (x: '' mkdir -p "$(dirname ${lib.escapeShellArg x.name})" ln -s ${lib.escapeShellArg "${x.path}"} ${lib.escapeShellArg x.name} '') entries} ''; /* * 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 $out * linkFarmFromDrvs "myexample" [ pkgs.hello pkgs.gcc pkgs.ghc ] * * This creates a derivation with a directory structure like the following: * * /nix/store/m3s6wkjy9c3wy830201bqsb91nk2yj8c-myexample * |-- gcc-wrapper-9.2.0 -> /nix/store/fqhjxf9ii4w4gqcsx59fyw2vvj91486a-gcc-wrapper-9.2.0 * |-- ghc-8.6.5 -> /nix/store/gnf3s07bglhbbk4y6m76sbh42siym0s6-ghc-8.6.5 * `-- hello-2.10 -> /nix/store/k0ll91c4npk4lg8lqhx00glg2m735g74-hello-2.10 */ linkFarmFromDrvs = name: drvs: let mkEntryFromDrv = drv: { name = drv.name; path = drv; }; in linkFarm name (map mkEntryFromDrv drvs); /* * Make a package that just contains a setup hook with the given contents. * This setup hook will be invoked by any package that includes this package * as a buildInput. Optionally takes a list of substitutions that should be * applied to the resulting script. * * Examples: * # setup hook that depends on the hello package and runs ./myscript.sh * myhellohook = makeSetupHook { deps = [ hello ]; } ./myscript.sh; * * # writes a Linux-exclusive setup hook where @bash@ myscript.sh is substituted for the * # bash interpreter. * myhellohookSub = makeSetupHook { * deps = [ hello ]; * substitutions = { bash = "${pkgs.bash}/bin/bash"; }; * meta.platforms = lib.platforms.linux; * } ./myscript.sh; */ makeSetupHook = { name ? "hook", deps ? [], substitutions ? {}, meta ? {} }: script: runCommand name (substitutions // { inherit meta; }) ('' mkdir -p $out/nix-support cp ${script} $out/nix-support/setup-hook '' + lib.optionalString (deps != []) '' printWords ${toString deps} > $out/nix-support/propagated-build-inputs '' + lib.optionalString (substitutions != {}) '' substituteAll ${script} $out/nix-support/setup-hook ''); # Write the references (i.e. the runtime dependencies in the Nix store) of `path' to a file. writeReferencesToFile = path: runCommand "runtime-deps" { exportReferencesGraph = ["graph" path]; } '' touch $out while read path; do echo $path >> $out read dummy read nrRefs for ((i = 0; i < nrRefs; i++)); do read ref; done done < graph ''; /* Write the set of references to a file, that is, their immediate dependencies. This produces the equivalent of `nix-store -q --references`. */ 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 ''; /* * 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); /* Print an error message if the file with the specified name and * hash doesn't exist in the Nix store. This function should only * be used by non-redistributable software with an unfree license * that we need to require the user to download manually. It produces * packages that cannot be built automatically. * * Examples: * * requireFile { * name = "my-file"; * url = "http://example.com/download/"; * sha256 = "ffffffffffffffffffffffffffffffffffffffffffffffffffff"; * } */ requireFile = { name ? null , sha256 ? null , sha1 ? null , url ? null , message ? null , hashMode ? "flat" } : assert (message != null) || (url != null); assert (sha256 != null) || (sha1 != 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 sha256 != null then "sha256" else "sha1"; hash = 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 ''; }; # 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 } can be # shortened to ${}. copyPathToStore = builtins.filterSource (p: t: true); # Copy a list of paths to the Nix store. copyPathsToStore = builtins.map copyPathToStore; /* Applies a list of patches to a source directory. * * Examples: * * # 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 ? [] , postPatch ? "" }: stdenvNoCC.mkDerivation { inherit name src patches postPatch; preferLocalBuild = true; allowSubstitutes = false; phases = "unpackPhase patchPhase installPhase"; installPhase = "cp -R ./ $out"; }; /* 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"; /* An immutable empty directory in the store. */ emptyDirectory = runCommand "empty-directory" { outputHashAlgo = "sha256"; outputHashMode = "recursive"; outputHash = "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5"; preferLocalBuild = true; } "mkdir $out"; }