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Introduce micro-activate (RIIR activate script + tiny bit of tmpfiles)

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Instead of interpreting all that shell and running actual tmpfiles, use
a tiny stage before systemd that mounts a tmpfs at /run (preventing
systemd from doing the same), populates it with NixOS symlinks and
preserved resolv.conf, and mounts the immutable /etc overlay before
passing control over to systemd.
This commit is contained in:
Val Packett 2025-12-04 06:59:50 -03:00
parent 3d2f6c4732
commit 0bd986f97f
5 changed files with 151 additions and 40 deletions
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17
packages/munix/default.nix
View file

@ -1,12 +1,25 @@
{ writeScriptBin, symlinkJoin, makeWrapper, muvm, passt, bubblewrap, sidebus-broker, mesa }:
{ stdenv, writeScriptBin, symlinkJoin, makeWrapper, muvm, passt, bubblewrap, sidebus-broker, mesa, rustc }:
let
munixScript = (writeScriptBin "munix" (builtins.readFile ../../munix)).overrideAttrs(old: {
buildCommand = "${old.buildCommand}\n patchShebangs $out";
});
microActivate = stdenv.mkDerivation {
name = "micro-activate";
src = ../../micro-activate.rs;
dontUnpack = true;
nativeBuildInputs = [ rustc ];
buildPhase = ''
rustc -C opt-level=s -C panic=abort --edition 2024 -o micro-activate $src
'';
installPhase = ''
mkdir -p $out/bin
mv micro-activate $out/bin
'';
};
in symlinkJoin {
name = "munix";
paths = [ munixScript muvm passt bubblewrap sidebus-broker ];
paths = [ munixScript microActivate muvm passt bubblewrap sidebus-broker ];
buildInputs = [ makeWrapper ];
postBuild = ''
wrapProgram $out/bin/munix --prefix PATH : $out/bin --set FALLBACK_OPENGL_DRIVER ${mesa}