From 3d14617fc7006d161d531a9e9ddff9c163f84734 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Mon, 17 Jul 2023 13:25:43 +0200
Subject: [PATCH] cloud-init: enable filesystems based on what is used

---
 nixos/modules/services/system/cloud-init.nix | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/nixos/modules/services/system/cloud-init.nix b/nixos/modules/services/system/cloud-init.nix
index d782bb1a3666..61966fa6ce86 100644
--- a/nixos/modules/services/system/cloud-init.nix
+++ b/nixos/modules/services/system/cloud-init.nix
@@ -17,6 +17,7 @@ let
   ++ optional cfg.ext4.enable e2fsprogs
   ++ optional cfg.xfs.enable xfsprogs
   ;
+  hasFs = fsName: lib.any (fs: fs.fsType == fsName) (lib.attrValues config.fileSystems);
   settingsFormat = pkgs.formats.yaml { };
   cfgfile = settingsFormat.generate "cloud.cfg" cfg.settings;
 in
@@ -44,7 +45,8 @@ in
 
       btrfs.enable = mkOption {
         type = types.bool;
-        default = false;
+        default = hasFs "btrfs";
+        defaultText = literalExpression ''hasFs "btrfs"'';
         description = mdDoc ''
           Allow the cloud-init service to operate `btrfs` filesystem.
         '';
@@ -52,7 +54,8 @@ in
 
       ext4.enable = mkOption {
         type = types.bool;
-        default = true;
+        default = hasFs "ext4";
+        defaultText = literalExpression ''hasFs "ext4"'';
         description = mdDoc ''
           Allow the cloud-init service to operate `ext4` filesystem.
         '';
@@ -60,7 +63,8 @@ in
 
       xfs.enable = mkOption {
         type = types.bool;
-        default = false;
+        default = hasFs "xfs";
+        defaultText = literalExpression ''hasFs "xfs"'';
         description = mdDoc ''
           Allow the cloud-init service to operate `xfs` filesystem.
         '';