nixpkgs/pkgs/misc/my-env/default.nix
aszlig 6f683e4ba3
my-env: Use sed to substitute $initialPath.
initialPath is now added to the top of the modified setup.sh. It's not
very nice altogether to patch setup.sh in this way, as it is prone to
break on setup.sh changes, but it should (hopefully finally, but
unfortunately only temporarily) fix the issue ewemoa (in #nixos) had
with myEnvFun.

In the long term, if people want to have roughly similar functionality,
nix-shell provides a better way for that, so maybe we might either
remove myEnvFun or replace it with a smaller implementation using
nix-shell.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
2014-11-25 14:14:43 +01:00

155 lines
5.1 KiB
Nix

# 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.gcc, 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
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}
'';
}