om health: Make RAM/disk space part of info (not checks) (#323)

These are not directly relevant to Nix, so let's just display their
information on the banner.

<img width="375" alt="image"
src="https://github.com/user-attachments/assets/60b8759b-4eb5-4095-8d0b-fdb9e45c35b5">

crates/nix_health/src/check/mod.rs

@@ -5,5 +5,4 @@ pub mod flake_enabled;
 pub mod max_jobs;
 pub mod min_nix_version;
 pub mod rosetta;
-pub mod system;
 pub mod trusted_users;

crates/nix_health/src/lib.rs

@@ -33,7 +33,6 @@ pub struct NixHealth {
     pub flake_enabled: FlakeEnabled,
     pub max_jobs: MaxJobs,
     pub rosetta: Rosetta,
-    pub system: check::system::System,
     pub trusted_users: TrustedUsers,
     pub caches: Caches,
     pub direnv: Direnv,
@@ -50,7 +49,6 @@ impl<'a> IntoIterator for &'a NixHealth {
             &self.flake_enabled,
             &self.max_jobs,
             &self.rosetta,
-            &self.system,
             &self.trusted_users,
             &self.caches,
             &self.direnv,
@@ -146,6 +144,8 @@ pub async fn run_checks_with(flake_url: Option<FlakeUrl>) -> anyhow::Result<Vec<
     if nix_info.nix_env.os != OS::NixOS {
         tracing::info!("   - Nix installer: {}", nix_info.nix_env.installer);
     }
+    tracing::info!("   - RAM: {:?}", nix_info.nix_env.total_memory);
+    tracing::info!("   - Disk Space: {:?}", nix_info.nix_env.total_disk_space);
 
     let checks = health.run_checks(nix_info, flake_url.clone());
     Ok(checks)

crates/nix_rs/src/env.rs

@@ -159,7 +159,7 @@ impl Display for OS {
                 arch: _,
             } => {
                 if *nix_darwin {
-                    write!(f, "nix-darwin")
+                    write!(f, "macOS (nix-darwin)")
                 } else {
                     write!(f, "macOS")
                 }

doc/src/history.md

@@ -10,6 +10,7 @@
 - `om health`
   - Display Nix installer used (supports DetSys installer)
   - Display information in Markdown
+  - Remove RAM/disk space checks, moving them to "information" section
 - `om ci`
   - Support for remote builds over SSH (via `--on` option)
   - Support for CI steps

nix/modules/om.nix

@@ -61,11 +61,6 @@
         nix-version.min-required = "2.16.0";
         caches.required = [ "https://om.cachix.org" ];
         direnv.required = true;
-        system = {
-          # required = true;
-          min_ram = "16G";
-          # min_disk_space = "2T";
-        };
       };
       hack.default = {
         # TODO: This is not implemented yet.