dotfiles/hm/usernix/default.nix

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2023-12-22 23:29:14 +01:00
{ pkgs, lib, config, ... }:
let
ensureNixPath = "${config.xdg.configHome}/dotfiles/ensure_nix.sh";
in
{
config = lib.mkIf config.frogeye.userNix {
home.activation = {
# When Nix is installed in the user directory via a proot, systemd --user
# is started outside of it, so it cannot access /nix. So we need to:
# - Ensure files systemd access aren't via /nix.
# Sometimes there's multiple layers of redirection, so easiest way is
# to copy the file outside the repository, but if using regular files
# directly home-manager will complain that it will overwrite
# something it didn't write.
# - Wrap services entrypoints into a proot wrapper
prootSystemd = lib.hm.dag.entryAfter [ "linkGeneration" ] [ "reloadSystemd" ] ''
cd ${config.xdg.configHome}/systemd/user
${pkgs.findutils}/bin/find . -type l | while read path
do
${pkgs.gnused}/bin/sed 's|^Exec\S\+=|\0${ensureNixPath} |' "$path" > "''${path}-proot"
rm "$path"
ln -s "''${path}-proot" "$path"
done
'';
# I wonder if it's possible to do this in a slightly more Nix way, without causing infinite recursion
# Create a graphical entrypoint by overriding one of the OS programs
graphicalEntrypoints =
let
graphicalEntrypoint = pkgs.writeTextFile {
name = "graphical-entrypoint";
text = ''
#!/usr/bin/env sh
exec ${ensureNixPath} ${config.xsession.scriptPath}
'';
executable = true;
};
in
lib.mkIf config.frogeye.desktop.xorg
lib.hm.dag.entryAfter [ "writeBoundary" ] ''
cp -f ${graphicalEntrypoint} ${config.home.homeDirectory}/.local/bin/cinnamon-session-cinnamon
'';
};
# Some systemd options don't work if you're running a proot inside, so they need to be relaxed
# TODO Following is what's necessary to remove for Syncthing to work. Might be applicable on all services.
# PrivateUsers=true
# RestrictNamespaces=true
# SystemCallFilter=@system-service
};
}