问题
Is there a way to override scripts and/or configs in an existing derivation without having to recompile the whole package?
I'd like to create a new version of gnome-session with modified $out/share/gnome-session/sessions/gnome.session
modified. Using overridePackage
I can change the preFixup
phase, but this causes the whole gnome-session package to be recompiled.
回答1:
A simple solution to problem is creating a new derivation without any sources. The trick is to create links to every file and directory in the base derivation, except for any file(s) in need of modification. These files are handled explicitly according to needs.
The snippet below shows how to create a new gnome-session with xmonad instead of gnome-shell.
{ nixpkgs ? import <nixpkgs> {} }:
let
inherit (nixpkgs) pkgs;
in
pkgs.stdenv.mkDerivation {
name = "gnome-session";
builder = pkgs.writeText "builder.sh" ''
# source standard environment
. $stdenv/setup
# shorthands
refpkg=${pkgs.gnome3.gnome_session}
file=share/gnome-session/sessions/gnome.session
# create output dirs for new derivation
mkdir -p $out/share
mkdir -p $out/share/gnome-session/sessions
# link unchanged files from the original gnome-session
ln -sf $refpkg/bin $out
ln -sf $refpkg/libexec $out
find $refpkg/share -maxdepth 1 \
-not -name gnome-session -exec ln -sf {} $out/share \;
# change gnome-shell to xmonad
sed 's/org.gnome.Shell/xmonad/' $refpkg/$file > $out/$file
'';
# make sure gnome-session is installed before deriving it!
buildInputs = [ pkgs.gnome3.gnome_session ];
}
来源:https://stackoverflow.com/questions/41465738/override-scripts-in-nix-derivations