From 436ade540fef06ce2efc017f60c9552d24f2a601 Mon Sep 17 00:00:00 2001
From: colin <colin@uninsane.org>
Date: Fri, 24 Jun 2022 21:10:49 -0700
Subject: [PATCH] tune /var/lib impermanence (for lappy)

---
 machines/lappy/default.nix |  3 +++
 modules/impermanence.nix   | 21 ++++++++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/machines/lappy/default.nix b/machines/lappy/default.nix
index 0fb5b4e9..28f4956c 100644
--- a/machines/lappy/default.nix
+++ b/machines/lappy/default.nix
@@ -10,6 +10,9 @@
   boot.loader.efi.canTouchEfiVariables = false;
   colinsane.image.extraBootFiles = [ pkgs.bootpart-uefi-x86_64 ];
 
+  # TODO: only here for debugging
+  # services.ipfs.enable = true;
+
   # docs: https://nixos.org/manual/nixos/stable/options.html#opt-system.stateVersion
   system.stateVersion = "21.05";
 }
diff --git a/modules/impermanence.nix b/modules/impermanence.nix
index f779a3d9..7cc34780 100644
--- a/modules/impermanence.nix
+++ b/modules/impermanence.nix
@@ -44,7 +44,26 @@ in
         # "/etc/nixos"
         "/etc/ssh"
         # TODO: more granular persistence of /var/lib
-        "/var/lib"
+        # "/var/lib/AccountsService"   # not sure what this is, but it's empty
+        "/var/lib/alsa"                # preserve output levels, default devices
+        # "/var/lib/blueman"           # files aren't human readable
+        "/var/lib/bluetooth"           # preserve bluetooth handshakes
+        "/var/lib/colord"              # preserve color calibrations (?)
+        # "/var/lib/dhclient"          # empty on lappy; dunno about desko
+        # "/var/lib/fwupd"             # not sure why this would need persistent state
+        # "/var/lib/geoclue"           # empty on lappy
+        # "/var/lib/logrotate.status"  # seems redundant with what's in /var/log?
+        "/var/lib/machines"            # maybe not needed, but would be painful to add a VM and forget.
+        # "/var/lib/misc"              # empty on lappy
+        # "/var/lib/NetworkManager"    # looks to be mostly impermanent state?
+        # "/var/lib/NetworkManager-fortisslvpn" # empty on lappy
+        "/var/lib/nixos"               # has some uid/gid maps; not sure what happens if we lose this.
+        # "/var/lib/PackageKit"        # wtf is this?
+        # "/var/lib/power-profiles-daemon"  # redundant with nixos declarations
+        # "/var/lib/private"           # empty on lappy
+        # "/var/lib/systemd"           # nothing obviously necessary
+        # "/var/lib/udisks2"           # empty on lappy
+        # "/var/lib/upower"            # historic charge data. unnecessary, but maybe used somewhere?
         "/var/log"
         "/mnt"
         # TODO: what even GOES in /srv?