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# idea: provide nix environment for your developement actions
# experimental
/*
# example:
# add postgresql to environment and create ctags (tagfiles can be extracted from TAG_FILES)
# add this to your ~/.nixpkgs/config.nix
{
packageOverrides = pkgs : with pkgs; with sourceAndTags;
let simple = { 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 {
nixEnv = simple {
name = "nix";
buildInputs = [ libtool stdenv perl curl bzip2 openssl aterm242fixes db45 autoconf automake zlib ];
cTags = [ aterm242fixes];
};
[...]
};
}
Put this into your .bashrc
loadEnv(){ . "${HOME}/.nix-profile/dev-envs/${1}" }
then nix-env -iA ...nixEnv
and
$ loadEnv postgresql
*/
{ mkDerivation, substituteAll, pkgs } : { stdenv ? pkgs.stdenv, name, buildInputs ? [], cTags ? [], extraCmds ? ""} :
mkDerivation {
buildInputs = [ ] ++ buildInputs ;
name = "env-${name}";
phases = "buildPhase";
setupNew = substituteAll {
src = ../../stdenv/generic/setup-new.sh;
preHook="";
postHook="";
initialPath= (import ../../stdenv/common-path.nix) { inherit pkgs; };
gcc = stdenv.gcc;
};
buildPhase = ''
set -x
mkdir -p "$out/dev-envs" "$out/nix-support"
s="$out/nix-support/setup-new-modified"
cp "$setupNew" "$s"
# shut some warning up.., do not use set -e
sed -e 's@set -e@@' \
-e 's@assertEnvExists\s\+NIX_STORE@:@' \
-e 's@trap.*@@' \
-i "$s"
cat >> "$out/dev-envs/''${name/env-/}" << EOF
buildInputs="$buildInputs"
# the setup-new script wants to write some data to a temp file.. so just let it do that and tidy up afterwards
tmp="\$("${pkgs.coreutils}/bin/mktemp" -d)"
NIX_BUILD_TOP="\$tmp"
phases=
# only do all the setup stuff in nix-support/*
set +e
source "$s"
rm -fr "\$tmp"
${extraCmds}
export PATH
echo $name loaded
EOF
'';
}
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