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|
with import ../lib;
/* Collection of nix-writers.
*
* Purpose: Use your favourite language to generate
* an executable and package it in nix.
*
* How to use it: Every nix-writer has the form:
* writeLang "Name-of-exec" ''
* source code in <Lang>
* ''
*
* If the source code compiles in <Lang>,
* nix will generate an executable /nix/store/<SHA>-<Name-of-exec>
*
* Getting started:
*
* Switch into the example directory and call
* nix-build hello_world.nix.
*/
pkgs: oldpkgs: {
exec = name: { filename, argv ? null, envp ? null, destination ? "" }:
pkgs.writeC name { inherit destination; } /* c */ ''
#include <unistd.h>
static char *const filename = ${toC filename};
${if argv == null
then /* Propagate arguments */ /* c */ ''
#define MAIN_ARGS int argc, char **argv
''
else /* Provide fixed arguments */ /* c */ ''
#define MAIN_ARGS void
static char *const argv[] = ${toC (argv ++ [null])};
''}
${optionalString (envp != null) /* c */ ''
static char *const envp[] = ${toC (
mapAttrsToList (k: v: "${k}=${v}") envp ++ [null]
)};
''}
int main (MAIN_ARGS) {
${if envp == null then /* c */ ''
execv(filename, argv);
'' else /* c */ ''
execve(filename, argv, envp);
''}
return -1;
}
'';
execBin = name: cfg:
pkgs.exec name (cfg // { destination = "/bin/${name}"; });
/* Base implementation for non-compiled executables.
Takes an interpreter, for example `${pkgs.bash}/bin/bash`
Examples:
writebash = makeScriptWriter { interpreter = "${pkgs.bash}/bin/bash"; }
makeScriptWriter { interpreter = "${pkgs.dash}/bin/dash"; } "hello" "echo hello world"
*/
makeScriptWriter = { interpreter, check ? null }: name: text:
assert (with types; either absolute-pathname filename).check name;
pkgs.write (baseNameOf name) {
${optionalString (types.absolute-pathname.check name) name} = {
inherit check;
executable = true;
text = "#! ${interpreter}\n${text}";
};
};
/* Take a name and specification and build a derivation out of it
Examples:
write "name" { "/etc/test" = { text = "hello world"; }; }
write "name" { "" = { executable = true; text = "echo hello world"; }; }
write "name" { "/bin/test" = { executable = true; text = "echo hello world"; }; }
write "name" { "" = { executable = true;
check = "${pkgs.shellcheck}/bin/shellcheck";
text = ''
#!/bin/sh
echo hello world
'';
}; }
*/
write = name: specs0:
let
env = filevars // { passAsFile = attrNames filevars; };
files = map write' specs;
filevars = genAttrs' (filter (hasAttr "var") files)
(spec: nameValuePair spec.var spec.val);
specs =
mapAttrsToList
(path: spec: let
known-types = [ "link" "text" ];
found-types = attrNames (getAttrs known-types spec);
type = assert length found-types == 1; head found-types;
in spec // { inherit path type; })
specs0;
writers.link =
{ path
, link
}:
assert path == "" || types.absolute-pathname.check path;
assert types.package.check link;
{
install = /* sh */ ''
${optionalString (path != "") /* sh */ ''
${pkgs.coreutils}/bin/mkdir -p $out${dirOf path}
''}
${pkgs.coreutils}/bin/ln -s ${link} $out${path}
'';
};
writers.text =
{ path
, check ? null
, executable ? false
, mode ? if executable then "0755" else "0644"
, text
}:
assert path == "" || types.absolute-pathname.check path;
assert types.bool.check executable;
assert types.file-mode.check mode;
rec {
var = "file_${hashString "sha1" path}";
val = text;
install = /* sh */ ''
${optionalString (check != null) /* sh */ ''
${check} ''$${var}Path
''}
${pkgs.coreutils}/bin/install \
-m ${mode} \
-D \
''$${var}Path $out${path}
'';
};
write' = spec: writers.${spec.type} (removeAttrs spec ["type"]);
in
# Use a subshell because <nixpkgs/stdenv/generic/setup.sh>'s genericBuild
# sources (or evaluates) the buildCommand and we don't want to modify its
# shell. In particular, exitHandler breaks in multiple ways with set -u.
pkgs.runCommand name env /* sh */ ''
(
set -efu
${concatMapStringsSep "\n" (getAttr "install") files}
)
'';
/* Like writeScript but the first line is a shebang to bash
Example:
writeBash "example" ''
echo hello world
''
*/
writeBash = pkgs.makeScriptWriter {
interpreter = "${pkgs.bash}/bin/bash";
};
writeBashBin = name:
assert types.filename.check name;
pkgs.writeBash "/bin/${name}";
writeC = name: {
destination ? "",
libraries ? {}
}: text: pkgs.runCommand name {
inherit text;
buildInputs = [ pkgs.pkgconfig ] ++ attrValues libraries;
passAsFile = [ "text" ];
} /* sh */ ''
PATH=${makeBinPath [
pkgs.binutils-unwrapped
pkgs.coreutils
pkgs.gcc
pkgs.pkgconfig
]}
exe=$out${destination}
mkdir -p "$(dirname "$exe")"
gcc \
${optionalString (libraries != [])
/* sh */ "$(pkg-config --cflags --libs ${
concatMapStringsSep " " escapeShellArg (attrNames libraries)
})"
} \
-O \
-o "$exe" \
-Wall \
-x c \
"$textPath"
strip --strip-unneeded "$exe"
'';
writeDash = pkgs.makeScriptWriter {
interpreter = "${pkgs.dash}/bin/dash";
};
writeDashBin = name:
assert types.filename.check name;
pkgs.writeDash "/bin/${name}";
writeEximConfig = name: text: pkgs.runCommand name {
inherit text;
passAsFile = [ "text" ];
} /* sh */ ''
# TODO validate exim config even with config.nix.useChroot == true
# currently doing so will fail because "user exim was not found"
#${pkgs.exim}/bin/exim -C "$textPath" -bV >/dev/null
mv "$textPath" $out
'';
writeHaskell = name: extra-depends: text:
pkgs.stdenv.mkDerivation {
inherit name;
src = pkgs.writeHaskellPackage name {
executables.${name} = {
inherit extra-depends;
text = text;
};
};
phases = [ "buildPhase" ];
buildPhase = ''
ln -fns $src/bin/${name} $out
'';
};
writeHaskellPackage =
k:
let
k' = parseDrvName k;
name = k'.name;
version = if k'.version != "" then k'.version else "0";
in
{ base-depends ? ["base"]
, executables ? {}
, ghc-options ? ["-Wall" "-O3" "-threaded" "-rtsopts"]
, haskellPackages ? pkgs.haskellPackages
, library ? null
, license ? "WTFPL"
}:
let
isExecutable = executables != {};
isLibrary = library != null;
cabal-file = pkgs.writeText "${name}-${version}.cabal" /* cabal */ ''
build-type: Simple
cabal-version: >= 1.2
name: ${name}
version: ${version}
${concatStringsSep "\n" (mapAttrsToList exe-section executables)}
${optionalString isLibrary (lib-section library)}
'';
exe-install =
exe-name:
{ file ? pkgs.writeText "${name}-${exe-name}.hs" text
, relpath ? "${exe-name}.hs"
, text
, ... }:
if types.filename.check exe-name
then /* sh */ "install -D ${file} $out/${relpath}"
else throw "argument ‘exe-name’ is not a ${types.filename.name}";
exe-section =
exe-name:
{ build-depends ? base-depends ++ extra-depends
, extra-depends ? []
, file ? pkgs.writeText "${name}-${exe-name}.hs" text
, relpath ? "${exe-name}.hs"
, text
, ... }: /* cabal */ ''
executable ${exe-name}
build-depends: ${concatStringsSep "," build-depends}
ghc-options: ${toString ghc-options}
main-is: ${relpath}
'';
get-depends =
{ build-depends ? base-depends ++ extra-depends
, extra-depends ? []
, ...
}:
build-depends;
lib-install =
{ exposed-modules
, ... }:
concatStringsSep "\n" (mapAttrsToList mod-install exposed-modules);
lib-section =
{ build-depends ? base-depends ++ extra-depends
, extra-depends ? []
, exposed-modules
, ... }: /* cabal */ ''
library
build-depends: ${concatStringsSep "," build-depends}
ghc-options: ${toString ghc-options}
exposed-modules: ${concatStringsSep "," (attrNames exposed-modules)}
'';
mod-install =
mod-name:
{ file ? pkgs.writeText "${name}-${mod-name}.hs" text
, relpath ? "${replaceStrings ["."] ["/"] mod-name}.hs"
, text
, ... }:
if types.haskell.modid.check mod-name
then /* sh */ "install -D ${file} $out/${relpath}"
else throw "argument ‘mod-name’ is not a ${types.haskell.modid.name}";
in
haskellPackages.mkDerivation {
inherit isExecutable isLibrary license version;
executableHaskellDepends =
attrVals
(concatMap get-depends (attrValues executables))
haskellPackages;
libraryHaskellDepends =
attrVals
(optionals isLibrary (get-depends library))
haskellPackages;
pname = name;
src = pkgs.runCommand "${name}-${version}-src" {} /* sh */ ''
install -D ${cabal-file} $out/${cabal-file.name}
${optionalString isLibrary (lib-install library)}
${concatStringsSep "\n" (mapAttrsToList exe-install executables)}
'';
};
writeJq = name: text:
assert (with types; either absolute-pathname filename).check name;
pkgs.write (baseNameOf name) {
${optionalString (types.absolute-pathname.check name) name} = {
check = pkgs.writeDash "jqcheck.sh" ''
exec ${pkgs.jq}/bin/jq -f "$1" < /dev/null
'';
inherit text;
};
};
writeJS = name: { deps ? [] }: text:
let
node-env = pkgs.buildEnv {
name = "node";
paths = deps;
pathsToLink = [
"/lib/node_modules"
];
};
in pkgs.writeDash name ''
export NODE_PATH=${node-env}/lib/node_modules
exec ${pkgs.nodejs}/bin/node ${pkgs.writeText "js" text}
'';
writeJSBin = name:
pkgs.writeJS "/bin/${name}";
writeJSON = name: value: pkgs.runCommand name {
json = toJSON value;
passAsFile = [ "json" ];
} /* sh */ ''
${pkgs.jq}/bin/jq . "$jsonPath" > "$out"
'';
writeNixFromCabal =
trace (toString [
"The function `writeNixFromCabal` has been deprecated in favour of"
"`writeHaskell`."
])
(name: path: pkgs.runCommand name {} /* sh */ ''
${pkgs.cabal2nix}/bin/cabal2nix ${path} > $out
'');
writePerl = name: { deps ? [] }:
let
perl-env = pkgs.buildEnv {
name = "perl-environment";
paths = deps;
pathsToLink = [
"/lib/perl5/site_perl"
];
};
in
pkgs.makeScriptWriter {
interpreter = "${pkgs.perl}/bin/perl -I ${perl-env}/lib/perl5/site_perl";
} name;
writePerlBin = name:
pkgs.writePerl "/bin/${name}";
writePython2 = name: { deps ? [], flakeIgnore ? [] }:
let
py = pkgs.python2.withPackages (ps: deps);
ignoreAttribute = optionalString (flakeIgnore != []) "--ignore ${concatMapStringsSep "," escapeShellArg flakeIgnore}";
in
pkgs.makeScriptWriter {
interpreter = "${py}/bin/python";
check = pkgs.writeDash "python2check.sh" ''
exec ${pkgs.python2Packages.flake8}/bin/flake8 --show-source ${ignoreAttribute} "$1"
'';
} name;
writePython2Bin = name:
pkgs.writePython2 "/bin/${name}";
writePython3 = name: { deps ? [], flakeIgnore ? [] }:
let
py = pkgs.python3.withPackages (ps: deps);
ignoreAttribute = optionalString (flakeIgnore != []) "--ignore ${concatMapStringsSep "," escapeShellArg flakeIgnore}";
in
pkgs.makeScriptWriter {
interpreter = "${py}/bin/python";
check = pkgs.writeDash "python3check.sh" ''
exec ${pkgs.python3Packages.flake8}/bin/flake8 --show-source ${ignoreAttribute} "$1"
'';
} name;
writePython3Bin = name:
pkgs.writePython3 "/bin/${name}";
writeSed = pkgs.makeScriptWriter {
interpreter = "${pkgs.gnused}/bin/sed -f";
};
}
|