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https://github.com/NixOS/nixpkgs.git
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153 lines
4.9 KiB
Nix
153 lines
4.9 KiB
Nix
# idea: provide a build environments for your developement of preference
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/*
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#### examples of use: ####
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# Add this to your ~/.config/nixpkgs/config.nix:
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{
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packageOverrides = pkgs : with pkgs; {
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sdlEnv = pkgs.myEnvFun {
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name = "sdl";
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nativeBuildInputs = [ cmake pkg-config ];
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buildInputs = [ stdenv SDL SDL_image SDL_ttf SDL_gfx SDL_net];
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};
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};
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}
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# Then you can install it by:
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# $ nix-env -i env-sdl
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# And you can load it simply calling:
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# $ load-env-sdl
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# and this will update your env vars to have 'make' and 'gcc' finding the SDL
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# headers and libs.
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##### Another example, more complicated but achieving more: #######
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# Make an environment to build nix from source and create ctags (tagfiles can
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# be extracted from TAG_FILES) from every source package. Here would be a
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# full ~/.config/nixpkgs/config.nix
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{
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packageOverrides = pkgs : with pkgs; with sourceAndTags;
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let complicatedMyEnv = { name, buildInputs ? [], cTags ? [], extraCmds ? ""}:
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pkgs.myEnvFun {
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inherit name;
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buildInputs = buildInputs
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++ map (x : sourceWithTagsDerivation
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( (addCTaggingInfo x ).passthru.sourceWithTags ) ) cTags;
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extraCmds = ''
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${extraCmds}
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HOME=${builtins.getEnv "HOME"}
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. ~/.bashrc
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'';
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};
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in rec {
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# this is the example we will be using
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nixEnv = complicatedMyEnv {
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name = "nix";
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buildInputs = [ libtool stdenv perl curl bzip2 openssl db5 autoconf automake zlib ];
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};
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};
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}
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# Now we should build our newly defined custom environment using this command on a shell, so type:
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# $ nix-env -i env-nix
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# You can load the environment simply typing a "load-env-${name}" command.
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# $ load-env-nix
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# The result using that command should be:
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# env-nix loaded
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and show you a shell with a prefixed prompt.
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*/
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{ mkDerivation, substituteAll, pkgs }:
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{ stdenv ? pkgs.stdenv, name, buildInputs ? []
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, propagatedBuildInputs ? [], gcc ? stdenv.cc, extraCmds ? ""
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, cleanupCmds ? "", shell ? "${pkgs.bashInteractive}/bin/bash --norc"}:
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mkDerivation {
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inherit buildInputs propagatedBuildInputs;
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name = "env-${name}";
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phases = [ "buildPhase" "fixupPhase" ];
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setupNew = substituteAll {
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src = ../../stdenv/generic/setup.sh;
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inherit gcc;
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};
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buildPhase = let
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initialPath = import ../../stdenv/common-path.nix { inherit pkgs; };
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in ''
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set -x
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mkdir -p "$out/dev-envs" "$out/nix-support" "$out/bin"
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s="$out/nix-support/setup-new-modified"
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# shut some warning up.., do not use set -e
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sed -e 's@set -eu@@' \
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-e 's@assertEnvExists\s\+NIX_STORE@:@' \
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-e 's@trap.*@@' \
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-e '1i initialPath="${toString initialPath}"' \
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"$setupNew" > "$s"
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cat >> "$out/dev-envs/''${name/env-/}" << EOF
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defaultNativeBuildInputs="$defaultNativeBuildInputs"
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buildInputs="$buildInputs"
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propagatedBuildInputs="$propagatedBuildInputs"
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# the setup-new script wants to write some data to a temp file.. so just let it do that and tidy up afterwards
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tmp="\$("${pkgs.coreutils}/bin/mktemp" -d)"
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NIX_BUILD_TOP="\$tmp"
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phases=
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# only do all the setup stuff in nix-support/*
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set +e
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# This prevents having -rpath /lib in NIX_LDFLAGS
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export NIX_NO_SELF_RPATH=1
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if [[ -z "\$ZSH_VERSION" ]]; then
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source "$s"
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else
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setopt interactivecomments
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# fix bash indirection
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# let's hope the bash arrays aren't used
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# substitute is using bash array, so skip it
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echo '
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setopt NO_BAD_PATTERN
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setopt NO_BANG_HIST
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setopt NO_BG_NICE
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setopt NO_EQUALS
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setopt NO_FUNCTION_ARGZERO
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setopt GLOB_SUBST
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setopt NO_HUP
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setopt INTERACTIVE_COMMENTS
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setopt KSH_ARRAYS
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setopt NO_MULTIOS
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setopt NO_NOMATCH
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setopt RM_STAR_SILENT
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setopt POSIX_BUILTINS
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setopt SH_FILE_EXPANSION
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setopt SH_GLOB
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setopt SH_OPTION_LETTERS
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setopt SH_WORD_SPLIT
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' >> "\$tmp/script"
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sed -e 's/\''${!\([^}]*\)}/\''${(P)\1}/g' \
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-e 's/[[]\*\]//' \
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-e 's/substitute() {/ substitute() { return; /' \
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-e 's@PATH=\$@PATH=${pkgs.coreutils}/bin@' \
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"$s" >> "\$tmp/script"
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echo "\$tmp/script";
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source "\$tmp/script";
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fi
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${pkgs.coreutils}/bin/rm -fr "\$tmp"
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${extraCmds}
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nix_cleanup() {
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:
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${cleanupCmds}
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}
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export PATH
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echo $name loaded >&2
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trap nix_cleanup EXIT
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EOF
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mkdir -p $out/bin
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sed -e 's,@shell@,${shell},' -e s,@myenvpath@,$out/dev-envs/${name}, \
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-e 's,@name@,${name},' ${./loadenv.sh} > $out/bin/load-env-${name}
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chmod +x $out/bin/load-env-${name}
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'';
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}
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