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# idea: provide a build environments for your developement of preference
/*
#### examples of use: ####
# Add this to your ~/.nixpkgs/config.nix:
{
packageOverrides = pkgs : with pkgs; {
sdlEnv = pkgs.myEnvFun {
name = "sdl";
buildInputs = [ stdenv SDL SDL_image SDL_ttf SDL_gfx cmake SDL_net pkgconfig];
};
};
}
# Then you can install it by:
# $ nix-env -i env-sdl
# And you can load it simply calling:
# $ load-env-sdl
# and this will update your env vars to have 'make' and 'gcc' finding the SDL
# headers and libs.
##### Another example, more complicated but achieving more: #######
# Make an environment to build nix from source and create ctags (tagfiles can
# be extracted from TAG_FILES) from every source package. Here would be a
# full ~/.nixpkgs/config.nix
{
packageOverrides = pkgs : with pkgs; with sourceAndTags;
let complicatedMyEnv = { name, buildInputs ? [], cTags ? [], extraCmds ? ""}:
pkgs.myEnvFun {
inherit name;
buildInputs = buildInputs
++ map (x : sourceWithTagsDerivation
( (addCTaggingInfo x ).passthru.sourceWithTags ) ) cTags;
extraCmds = ''
${extraCmds}
HOME=${builtins.getEnv "HOME"}
. ~/.bashrc
'';
};
in rec {
# this is the example we will be using
nixEnv = complicatedMyEnv {
name = "nix";
buildInputs = [ libtool stdenv perl curl bzip2 openssl db45 autoconf automake zlib ];
};
};
}
# Now we should build our newly defined custom environment using this command on a shell, so type:
# $ nix-env -i env-nix
# You can load the environment simply typing a "load-env-${name}" command.
# $ load-env-nix
# The result using that command should be:
# env-nix loaded
and show you a shell with a prefixed prompt.
*/
{ mkDerivation, substituteAll, pkgs }:
{ stdenv ? pkgs.stdenv, name, buildInputs ? []
, propagatedBuildInputs ? [], gcc ? stdenv.cc, cTags ? [], extraCmds ? ""
, cleanupCmds ? "", shell ? "${pkgs.bashInteractive}/bin/bash --norc"}:
mkDerivation {
# The setup.sh script from stdenv will expect the native build inputs in
# the nativeBuildInputs environment variable.
nativeBuildInputs = [ ] ++ buildInputs;
# Trick to bypass the stdenv usual change of propagatedBuildInputs => propagatedNativeBuildInputs
propagatedBuildInputs2 = propagatedBuildInputs;
name = "env-${name}";
phases = [ "buildPhase" "fixupPhase" ];
setupNew = substituteAll {
src = ../../stdenv/generic/setup.sh;
inherit gcc;
};
buildPhase = let
initialPath = import ../../stdenv/common-path.nix { inherit pkgs; };
in ''
set -x
mkdir -p "$out/dev-envs" "$out/nix-support" "$out/bin"
s="$out/nix-support/setup-new-modified"
# shut some warning up.., do not use set -e
sed -e 's@set -e@@' \
-e 's@assertEnvExists\s\+NIX_STORE@:@' \
-e 's@trap.*@@' \
-e '1i initialPath="${toString initialPath}"' \
"$setupNew" > "$s"
cat >> "$out/dev-envs/''${name/env-/}" << EOF
nativeBuildInputs="$nativeBuildInputs"
propagatedBuildInputs="$propagatedBuildInputs2"
# the setup-new script wants to write some data to a temp file.. so just let it do that and tidy up afterwards
tmp="\$("${pkgs.coreutils}/bin/mktemp" -d)"
NIX_BUILD_TOP="\$tmp"
phases=
# only do all the setup stuff in nix-support/*
set +e
# This prevents having -rpath /lib in NIX_LDFLAGS
export NIX_NO_SELF_RPATH=1
if [[ -z "\$ZSH_VERSION" ]]; then
source "$s"
else
setopt interactivecomments
# fix bash indirection
# let's hope the bash arrays aren't used
# substitute is using bash array, so skip it
echo '
setopt NO_BAD_PATTERN
setopt NO_BANG_HIST
setopt NO_BG_NICE
setopt NO_EQUALS
setopt NO_FUNCTION_ARGZERO
setopt GLOB_SUBST
setopt NO_HUP
setopt INTERACTIVE_COMMENTS
setopt KSH_ARRAYS
setopt NO_MULTIOS
setopt NO_NOMATCH
setopt RM_STAR_SILENT
setopt POSIX_BUILTINS
setopt SH_FILE_EXPANSION
setopt SH_GLOB
setopt SH_OPTION_LETTERS
setopt SH_WORD_SPLIT
' >> "\$tmp/script"
sed -e 's/\''${!\([^}]*\)}/\''${(P)\1}/g' \
-e 's/[[]\*\]//' \
-e 's/substitute() {/ substitute() { return; /' \
-e 's@PATH=\$@PATH=${pkgs.coreutils}/bin@' \
"$s" >> "\$tmp/script"
echo "\$tmp/script";
source "\$tmp/script";
fi
${pkgs.coreutils}/bin/rm -fr "\$tmp"
${extraCmds}
nix_cleanup() {
:
${cleanupCmds}
}
export PATH
echo $name loaded >&2
trap nix_cleanup EXIT
EOF
mkdir -p $out/bin
sed -e 's,@shell@,${shell},' -e s,@myenvpath@,$out/dev-envs/${name}, \
-e 's,@name@,${name},' ${./loadenv.sh} > $out/bin/load-env-${name}
chmod +x $out/bin/load-env-${name}
'';
}
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