f2fs: enable compression

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1725377834,
-        "narHash": "sha256-tqoAO8oT6zEUDXte98cvA1saU9+1dLJQe3pMKLXv8ps=",
+        "lastModified": 1726842196,
+        "narHash": "sha256-u9h03JQUuQJ607xmti9F9Eh6E96kKUAGP+aXWgwm70o=",
         "owner": "nix-community",
         "repo": "disko",
-        "rev": "e55f9a8678adc02024a4877c2a403e3f6daf24fe",
+        "rev": "51994df8ba24d5db5459ccf17b6494643301ad28",
         "type": "github"
       },
       "original": {

pkgs/installer/flake-module.nix

@@ -49,6 +49,14 @@ let
                     type = "filesystem";
                     format = "f2fs";
                     mountpoint = "/";
+                    extraArgs = [
+                      "-O"
+                      "extra_attr,inode_checksum,sb_checksum,compression"
+                    ];
+                    # Recommendations for flash: https://wiki.archlinux.org/title/F2FS#Recommended_mount_options
+                    mountOptions = [
+                      "compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime,nodiscard"
+                    ];
                   };
                 };
               };
@@ -69,4 +77,7 @@ in
       boot.loader.grub.enable = lib.mkDefault true;
     };
   };
+
+  flake.checks.x86_64-linux.flash-installer-disk-test =
+    self.nixosConfigurations.flash-installer.config.system.build.installTest;
 }