Merge pull request 'Report available disk space in garage stats' (#487) from report-disk-usage into main

Reviewed-on: Deuxfleurs/garage#487

Cargo.lock

@@ -1257,6 +1257,7 @@ dependencies = [
  "serde",
  "serde_bytes",
  "serde_json",
+ "systemstat",
  "tokio",
  "tokio-stream",
  "tracing",
@@ -3549,6 +3550,20 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "systemstat"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a24aec24a9312c83999a28e3ef9db7e2afd5c64bf47725b758cdc1cafd5b0bd2"
+dependencies = [
+ "bytesize",
+ "lazy_static",
+ "libc",
+ "nom",
+ "time 0.3.17",
+ "winapi",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.3.0"

Cargo.nix

@@ -32,7 +32,7 @@ args@{
   ignoreLockHash,
 }:
 let
-  nixifiedLockHash = "456bca1fe75cfe5c26a9b56401a40b5b205c0096a0dc7287c7853c35498bc5c0";
+  nixifiedLockHash = "cf836c01a9c668bab5f9a09d468f47aa24c50abec92855503624d706721335ef";
   workspaceSrc = if args.workspaceSrc == null then ./. else args.workspaceSrc;
   currentLockHash = builtins.hashFile "sha256" (workspaceSrc + /Cargo.lock);
   lockHashIgnored = if ignoreLockHash
@@ -1790,6 +1790,7 @@ in
       serde = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde."1.0.152" { inherit profileName; }).out;
       serde_bytes = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde_bytes."0.11.8" { inherit profileName; }).out;
       serde_json = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde_json."1.0.91" { inherit profileName; }).out;
+      systemstat = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".systemstat."0.2.3" { inherit profileName; }).out;
       tokio = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio."1.24.2" { inherit profileName; }).out;
       tokio_stream = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio-stream."0.1.11" { inherit profileName; }).out;
       tracing = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tracing."0.1.37" { inherit profileName; }).out;
@@ -4938,6 +4939,21 @@ in
     };
   });
   
+  "registry+https://github.com/rust-lang/crates.io-index".systemstat."0.2.3" = overridableMkRustCrate (profileName: rec {
+    name = "systemstat";
+    version = "0.2.3";
+    registry = "registry+https://github.com/rust-lang/crates.io-index";
+    src = fetchCratesIo { inherit name version; sha256 = "a24aec24a9312c83999a28e3ef9db7e2afd5c64bf47725b758cdc1cafd5b0bd2"; };
+    dependencies = {
+      bytesize = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".bytesize."1.1.0" { inherit profileName; }).out;
+      lazy_static = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".lazy_static."1.4.0" { inherit profileName; }).out;
+      libc = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".libc."0.2.139" { inherit profileName; }).out;
+      ${ if hostPlatform.parsed.kernel.name == "linux" || hostPlatform.parsed.kernel.name == "android" then "nom" else null } = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".nom."7.1.3" { inherit profileName; }).out;
+      time = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".time."0.3.17" { inherit profileName; }).out;
+      ${ if hostPlatform.isWindows then "winapi" else null } = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".winapi."0.3.9" { inherit profileName; }).out;
+    };
+  });
+  
   "registry+https://github.com/rust-lang/crates.io-index".tempfile."3.3.0" = overridableMkRustCrate (profileName: rec {
     name = "tempfile";
     version = "3.3.0";
@@ -5961,6 +5977,7 @@ in
       [ "ntsecapi" ]
       [ "ntstatus" ]
       [ "objbase" ]
+      [ "pdh" ]
       [ "processenv" ]
       [ "processthreadsapi" ]
       [ "profileapi" ]
@@ -5977,6 +5994,7 @@ in
       (lib.optional (rootFeatures' ? "garage/consul-discovery" || rootFeatures' ? "garage_rpc/consul-discovery" || rootFeatures' ? "garage_rpc/reqwest") "winreg")
       [ "winsock2" ]
       [ "winstring" ]
+      [ "ws2def" ]
       [ "ws2ipdef" ]
       [ "ws2tcpip" ]
       [ "wtypesbase" ]

Makefile

@@ -4,7 +4,7 @@ all:
 	clear; cargo build
 
 release:
-	nix-build --arg release true
+	nix-build --attr pkgs.amd64.release --no-build-output
 
 shell:
 	nix-shell

default.nix

@@ -1,7 +1,4 @@
-{
+{ system ? builtins.currentSystem, git_version ? null, }:
-  system ? builtins.currentSystem,
-  git_version ? null,
-}:
 
 with import ./nix/common.nix;
 
@@ -13,21 +10,20 @@ let
     debug = (compile {
       inherit system target git_version pkgsSrc cargo2nixOverlay;
       release = false;
-    }).workspace.garage {
+    }).workspace.garage { compileMode = "build"; };
-      compileMode = "build";
-    };
 
     release = (compile {
       inherit system target git_version pkgsSrc cargo2nixOverlay;
       release = true;
-    }).workspace.garage {
+    }).workspace.garage { compileMode = "build"; };
-      compileMode = "build";
-    };
   });
 
-  test = (rustPkgs: pkgs.symlinkJoin {
+  test = (rustPkgs:
-    name ="garage-tests";
+    pkgs.symlinkJoin {
-    paths = builtins.map (key: rustPkgs.workspace.${key} { compileMode = "test"; }) (builtins.attrNames rustPkgs.workspace);
+      name = "garage-tests";
+      paths =
+        builtins.map (key: rustPkgs.workspace.${key} { compileMode = "test"; })
+        (builtins.attrNames rustPkgs.workspace);
     });
 
 in {
@@ -55,8 +51,6 @@ in {
       inherit system git_version pkgsSrc cargo2nixOverlay;
       target = "x86_64-unknown-linux-musl";
       compiler = "clippy";
-    }).workspace.garage {
+    }).workspace.garage { compileMode = "build"; };
-      compileMode = "build";
-    };
   };
 }

flake.nix

@@ -1,7 +1,9 @@
 {
-  description = "Garage, an S3-compatible distributed object store for self-hosted deployments";
+  description =
+    "Garage, an S3-compatible distributed object store for self-hosted deployments";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/a3073c49bc0163fea6a121c276f526837672b555";
+  inputs.nixpkgs.url =
+    "github:NixOS/nixpkgs/a3073c49bc0163fea6a121c276f526837672b555";
   inputs.cargo2nix = {
     # As of 2022-10-18: two small patches over unstable branch, one for clippy and one to fix feature detection
     url = "github:Alexis211/cargo2nix/a7a61179b66054904ef6a195d8da736eaaa06c36";
@@ -24,13 +26,11 @@
             release = true;
           }).workspace.garage { compileMode = "build"; };
         };
-        devShell = ((compile {
+        devShell = (compile {
           inherit system git_version;
           pkgsSrc = nixpkgs;
           cargo2nixOverlay = cargo2nix.overlays.default;
           release = false;
-        }).workspaceShell {
+        }).workspaceShell { packages = [ pkgs.rustfmt ]; };
-          packages = [ pkgs.rustfmt cargo2nix.packages.${system}.default ];
-        });
       });
 }

nix/build_index.nix

@@ -1,10 +1,8 @@
-{
+{ path ? "/../aws-list.txt", }:
-  path ? "/../aws-list.txt",
-}:
 
 with import ./common.nix;
 let
-  pkgs = import pkgsSrc {};
+  pkgs = import pkgsSrc { };
   lib = pkgs.lib;
 
   /* Converts a key list and a value list to a set
@@ -14,11 +12,10 @@ let
        => { name = "latex"; version = "3.14"; }
   */
   listToSet = keys: values:
-    builtins.listToAttrs 
+    builtins.listToAttrs (lib.zipListsWith (a: b: {
-      (lib.zipListsWith 
+      name = a;
-        (a: b: { name = a; value = b; }) 
+      value = b;
-        keys
+    }) keys values);
-        values);
 
   /* Says if datetime a is more recent than datetime b
 
@@ -27,72 +24,101 @@ let
        => true
   */
   cmpDate = a: b:
-    let da = (builtins.head a.builds).date;
+    let
+      da = (builtins.head a.builds).date;
       db = (builtins.head b.builds).date;
-    in 
+    in if da == db then
-      if da == db then  (builtins.head a.builds).time > (builtins.head b.builds).time
+      (builtins.head a.builds).time > (builtins.head b.builds).time
-      else da > db;
+    else
+      da > db;
 
-  /* Pretty platforms */
+  # Pretty platforms
   prettyPlatform = name:
-    if name == "aarch64-unknown-linux-musl" then "linux/arm64"
+    if name == "aarch64-unknown-linux-musl" then
-    else if name == "armv6l-unknown-linux-musleabihf" then "linux/arm"
+      "linux/arm64"
-    else if name == "x86_64-unknown-linux-musl" then "linux/amd64"
+    else if name == "armv6l-unknown-linux-musleabihf" then
-    else if name == "i686-unknown-linux-musl" then "linux/386"
+      "linux/arm"
-    else name;
+    else if name == "x86_64-unknown-linux-musl" then
+      "linux/amd64"
+    else if name == "i686-unknown-linux-musl" then
+      "linux/386"
+    else
+      name;
 
-  /* Parsing */
+  # Parsing
   list = builtins.readFile (./. + path);
   entries = lib.splitString "\n" list;
 
-  elems = builtins.filter 
+  elems = builtins.filter (e: (builtins.length e) == 4)
-    (e: (builtins.length e) == 4) 
+    (map (x: builtins.filter (e: e != "") (lib.splitString " " x)) entries);
-    (map 
-      (x: builtins.filter (e: e != "") (lib.splitString " " x)) 
-      entries);
 
-  keys = ["date" "time" "size" "path"];
+  keys = [ "date" "time" "size" "path" ];
   parsed = map (entry: listToSet keys entry) elems;
 
-  subkeys = ["root" "version" "platform" "binary" ];
+  subkeys = [ "root" "version" "platform" "binary" ];
-  builds = map (entry: entry // listToSet subkeys (lib.splitString "/" entry.path) // { url = "https://garagehq.deuxfleurs.fr/" + entry.path; }) parsed;
+  builds = map (entry:
+    entry // listToSet subkeys (lib.splitString "/" entry.path) // {
+      url = "https://garagehq.deuxfleurs.fr/" + entry.path;
+    }) parsed;
 
-  /* Aggregation */
+  # Aggregation
-  builds_per_version = lib.foldl (acc: v: acc // { ${v.version} = if builtins.hasAttr v.version acc then acc.${v.version} ++ [ v ] else [ v ]; }) {} builds; 
+  builds_per_version = lib.foldl (acc: v:
+    acc // {
+      ${v.version} = if builtins.hasAttr v.version acc then
+        acc.${v.version} ++ [ v ]
+      else
+        [ v ];
+    }) { } builds;
 
   versions = builtins.attrNames builds_per_version;
-  versions_release = builtins.filter (x: builtins.match "v[0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?" x != null) versions;
+  versions_release = builtins.filter
-  versions_commit = builtins.filter (x: builtins.match "[0-9a-f]{40}" x != null) versions;
+    (x: builtins.match "v[0-9]+.[0-9]+.[0-9]+(.[0-9]+)?" x != null) versions;
-  versions_extra = lib.subtractLists (versions_release ++ versions_commit) versions;
+  versions_commit =
+    builtins.filter (x: builtins.match "[0-9a-f]{40}" x != null) versions;
+  versions_extra =
+    lib.subtractLists (versions_release ++ versions_commit) versions;
 
   sorted_builds = [
     {
       name = "Release";
       hide = false;
       type = "tag";
-      description = "Release builds are the official builds, they are tailored for productions and are the most tested.";
+      description =
-      builds =  builtins.sort (a: b: a.version > b.version) (map (x: { version = x; builds = builtins.getAttr x builds_per_version; }) versions_release);
+        "Release builds are the official builds, they are tailored for productions and are the most tested.";
+      builds = builtins.sort (a: b: a.version > b.version) (map (x: {
+        version = x;
+        builds = builtins.getAttr x builds_per_version;
+      }) versions_release);
     }
     {
       name = "Extra";
       hide = true;
       type = "tag";
-      description = "Extra builds are built on demand to test a specific feature or a specific need.";
+      description =
-      builds = builtins.sort cmpDate (map (x: { version = x; builds = builtins.getAttr x builds_per_version; }) versions_extra);
+        "Extra builds are built on demand to test a specific feature or a specific need.";
+      builds = builtins.sort cmpDate (map (x: {
+        version = x;
+        builds = builtins.getAttr x builds_per_version;
+      }) versions_extra);
     }
     {
       name = "Development";
       hide = true;
       type = "commit";
-      description = "Development builds are built periodically. Use them if you want to test a specific feature that is not yet released.";
+      description =
-      builds = builtins.sort cmpDate (map (x: { version = x; builds = builtins.getAttr x builds_per_version; }) versions_commit);
+        "Development builds are built periodically. Use them if you want to test a specific feature that is not yet released.";
+      builds = builtins.sort cmpDate (map (x: {
+        version = x;
+        builds = builtins.getAttr x builds_per_version;
+      }) versions_commit);
     }
   ];
 
-  json = pkgs.writeTextDir "share/_releases.json" (builtins.toJSON sorted_builds);
+  json =
+    pkgs.writeTextDir "share/_releases.json" (builtins.toJSON sorted_builds);
   html = pkgs.writeTextDir "share/_releases.html" ''
-<!doctype html>
+    <!doctype html>
-<html>
+    <html>
       <head>
         <meta charset="utf-8" />
         <title>Garage releases</title>
@@ -114,20 +140,29 @@ let
         </style>
       </head>
       <body>
-   ${ builtins.toString (lib.forEach sorted_builds (r: ''
+       ${
+         builtins.toString (lib.forEach sorted_builds (r: ''
            <section>
              <h2>${r.name} builds</h2>
 
              <p>${r.description}</p>
 
-      ${if r.hide then "<details><summary>Show ${r.name} builds</summary>" else ""}
+             ${
-      ${ builtins.toString (lib.forEach r.builds (x: ''
+               if r.hide then
+                 "<details><summary>Show ${r.name} builds</summary>"
+               else
+                 ""
+             }
+             ${
+               builtins.toString (lib.forEach r.builds (x: ''
                  <h3> ${x.version} (${(builtins.head x.builds).date}) </h3>
                  <p>See this build on</p>
                  <p> Binaries:
                  <ul>
-        ${ builtins.toString (lib.forEach x.builds (b: ''
+                 ${builtins.toString (lib.forEach x.builds (b: ''
-          <li><a href="/${b.path}">${prettyPlatform b.platform}</a></li>
+                   <li><a href="/${b.path}">${
+                     prettyPlatform b.platform
+                   }</a></li>
                  ''))}
                  </ul></p>
                  <p> Sources:
@@ -136,16 +171,22 @@ let
                   <li><a href="https://git.deuxfleurs.fr/Deuxfleurs/garage/archive/${x.version}.zip">.zip</a></li>
                   <li><a href="https://git.deuxfleurs.fr/Deuxfleurs/garage/archive/${x.version}.tar.gz">.tar.gz</a></li>
                  </ul></p>
-      ''))  }
+               ''))
-      ${ if builtins.length r.builds == 0 then "<em>There is no build for this category</em>" else "" }
+             }
+             ${
+               if builtins.length r.builds == 0 then
+                 "<em>There is no build for this category</em>"
+               else
+                 ""
+             }
              ${if r.hide then "</details>" else ""}
            </section>
-  ''))}
+         ''))
+       }
       </body>
-</html>
+    </html>
-'';
+  '';
-in
+in pkgs.symlinkJoin {
-  pkgs.symlinkJoin {
   name = "releases";
   paths = [ json html ];
-  }
+}

nix/common.nix

@@ -1,10 +1,9 @@
 rec {
-  /*
+  # * Fixed dependencies
-   * Fixed dependencies
-   */
   pkgsSrc = fetchTarball {
     # As of 2022-10-13
-    url = "https://github.com/NixOS/nixpkgs/archive/a3073c49bc0163fea6a121c276f526837672b555.zip";
+    url =
+      "https://github.com/NixOS/nixpkgs/archive/a3073c49bc0163fea6a121c276f526837672b555.zip";
     sha256 = "1bz632psfbpmicyzjb8b4265y50shylccvfm6ry6mgnv5hvz324s";
   };
   cargo2nixSrc = fetchGit {
@@ -14,9 +13,7 @@ rec {
     rev = "a7a61179b66054904ef6a195d8da736eaaa06c36";
   };
 
-  /*
+  # * Shared objects
-   * Shared objects
-   */
   cargo2nix = import cargo2nixSrc;
   cargo2nixOverlay = cargo2nix.overlays.default;
 }

nix/compile.nix

@@ -1,19 +1,10 @@
-{
+{ system, target ? null, pkgsSrc, cargo2nixOverlay, compiler ? "rustc"
-  system,
+, release ? false, git_version ? null, features ? null, }:
-  target ? null,
-  pkgsSrc,
-  cargo2nixOverlay,
-  compiler ? "rustc",
-  release ? false,
-  git_version ? null,
-  features ? null,
-}:
 
 let
   log = v: builtins.trace v v;
 
-  pkgs =
+  pkgs = if target != null then
-    if target != null then
     import pkgsSrc {
       inherit system;
       crossSystem = {
@@ -28,8 +19,7 @@ let
       overlays = [ cargo2nixOverlay ];
     };
 
-  /*
+  /* Cargo2nix is built for rustOverlay which installs Rust from Mozilla releases.
-   Cargo2nix is built for rustOverlay which installs Rust from Mozilla releases.
      This is fine for 64-bit platforms, but for 32-bit platforms, we need our own Rust
      to avoid incompatibilities with time_t between different versions of musl
      (>= 1.2.0 shipped by NixOS, < 1.2.0 with which rustc was built), which lead to compilation breakage.
@@ -40,8 +30,8 @@ let
      In practise, rustOverlay ships rustc+cargo in a single derivation while
      NixOS ships them in separate ones. We reunite them with symlinkJoin.
   */
-  toolchainOptions =
+  toolchainOptions = if target == null || target == "x86_64-unknown-linux-musl"
-    if target == null || target == "x86_64-unknown-linux-musl" || target == "aarch64-unknown-linux-musl" then {
+  || target == "aarch64-unknown-linux-musl" then {
     rustVersion = "1.63.0";
     extraRustComponents = [ "clippy" ];
   } else {
@@ -55,11 +45,11 @@ let
     };
   };
 
-
+  buildEnv = (drv:
-  buildEnv = (drv: {
+    {
       rustc = drv.setBuildEnv;
       clippy = ''
-      ${drv.setBuildEnv or "" }
+        ${drv.setBuildEnv or ""}
         echo
         echo --- BUILDING WITH CLIPPY ---
         echo
@@ -69,16 +59,15 @@ let
       '';
     }.${compiler});
 
-  /*
+  /* Cargo2nix provides many overrides by default, you can take inspiration from them:
-   Cargo2nix provides many overrides by default, you can take inspiration from them:
      https://github.com/cargo2nix/cargo2nix/blob/master/overlay/overrides.nix
 
      You can have a complete list of the available options by looking at the overriden object, mkcrate:
      https://github.com/cargo2nix/cargo2nix/blob/master/overlay/mkcrate.nix
   */
-  packageOverrides = pkgs: pkgs.rustBuilder.overrides.all ++ [
+  packageOverrides = pkgs:
-    /*
+    pkgs.rustBuilder.overrides.all ++ [
-     [1] We add some logic to compile our crates with clippy, it provides us many additional lints
+      /* [1] We add some logic to compile our crates with clippy, it provides us many additional lints
 
          [2] We need to alter Nix hardening to make static binaries: PIE,
          Position Independent Executables seems to be supported only on amd64. Having
@@ -100,103 +89,119 @@ let
         name = "garage";
         overrideAttrs = drv:
           (if git_version != null then {
-          /* [3] */ preConfigure = ''
+            # [3]
+            preConfigure = ''
               ${drv.preConfigure or ""}
               export GIT_VERSION="${git_version}"
             '';
-        } else {})
+          } else
-        //
+            { }) // {
-      {
+              # [1]
-        /* [1] */ setBuildEnv = (buildEnv drv);
+              setBuildEnv = (buildEnv drv);
-        /* [2] */ hardeningDisable = [ "pie" ];
+              # [2]
+              hardeningDisable = [ "pie" ];
             };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_rpc";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_db";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_util";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_table";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_block";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_model";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_api";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "garage_web";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "k2v-client";
-      overrideAttrs = drv: { /* [1] */ setBuildEnv = (buildEnv drv); };
+        overrideAttrs = drv: { # [1]
+          setBuildEnv = (buildEnv drv);
+        };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "libsodium-sys";
         overrideArgs = old: {
-        features = [ ]; /* [4] */
+          features = [ ]; # [4]
         };
       })
 
       (pkgs.rustBuilder.rustLib.makeOverride {
         name = "zstd-sys";
         overrideArgs = old: {
-        features = [ ]; /* [4] */
+          features = [ ]; # [4]
         };
       })
     ];
 
-  /*
+  /* We ship some parts of the code disabled by default by putting them behind a flag.
-    We ship some parts of the code disabled by default by putting them behind a flag.
      It speeds up the compilation (when the feature is not required) and released crates have less dependency by default (less attack surface, disk space, etc.).
      But we want to ship these additional features when we release Garage.
      In the end, we chose to exclude all features from debug builds while putting (all of) them in the release builds.
   */
-  rootFeatures = if features != null then features else
+  rootFeatures = if features != null then
-     ([
+    features
-       "garage/bundled-libs"
+  else
-       "garage/sled"
+    ([ "garage/bundled-libs" "garage/sled" "garage/k2v" ] ++ (if release then [
-       "garage/k2v"
-     ] ++ (if release then [
       "garage/consul-discovery"
       "garage/kubernetes-discovery"
       "garage/metrics"
       "garage/telemetry-otlp"
       "garage/lmdb"
       "garage/sqlite"
-     ] else []));
+    ] else
-
+      [ ]));
 
   packageFun = import ../Cargo.nix;
 
-  /*
+  /* We compile fully static binaries with musl to simplify deployment on most systems.
-    We compile fully static binaries with musl to simplify deployment on most systems.
      When possible, we reactivate PIE hardening (see above).
 
      Also, if you set the RUSTFLAGS environment variable, the following parameters will
@@ -207,21 +212,29 @@ let
   */
 
   codegenOpts = {
-   "armv6l-unknown-linux-musleabihf" = [ "target-feature=+crt-static" "link-arg=-static" ]; /* compile as dynamic with static-pie */
+    "armv6l-unknown-linux-musleabihf" = [
-   "aarch64-unknown-linux-musl" = [ "target-feature=+crt-static" "link-arg=-static" ]; /* segfault with static-pie */
+      "target-feature=+crt-static"
-   "i686-unknown-linux-musl" = [ "target-feature=+crt-static" "link-arg=-static" ]; /* segfault with static-pie */
+      "link-arg=-static"
-   "x86_64-unknown-linux-musl" = [ "target-feature=+crt-static" "link-arg=-static-pie" ];
+    ]; # compile as dynamic with static-pie
+    "aarch64-unknown-linux-musl" = [
+      "target-feature=+crt-static"
+      "link-arg=-static"
+    ]; # segfault with static-pie
+    "i686-unknown-linux-musl" = [
+      "target-feature=+crt-static"
+      "link-arg=-static"
+    ]; # segfault with static-pie
+    "x86_64-unknown-linux-musl" =
+      [ "target-feature=+crt-static" "link-arg=-static-pie" ];
   };
 
-  /*
+  # NixOS and Rust/Cargo triples do not match for ARM, fix it here.
-    NixOS and Rust/Cargo triples do not match for ARM, fix it here.
+  rustTarget = if target == "armv6l-unknown-linux-musleabihf" then
-  */
+    "arm-unknown-linux-musleabihf"
-  rustTarget = if target == "armv6l-unknown-linux-musleabihf"
+  else
-    then "arm-unknown-linux-musleabihf"
+    target;
-    else target;
 
-in
+in pkgs.rustBuilder.makePackageSet ({
-  pkgs.rustBuilder.makePackageSet ({
   inherit release packageFun packageOverrides codegenOpts rootFeatures;
   target = rustTarget;
-  } // toolchainOptions)
+} // toolchainOptions)

nix/kaniko.nix

@@ -15,7 +15,8 @@ pkgs.buildGoModule rec {
   checkPhase = "true";
 
   meta = with pkgs.lib; {
-    description = "kaniko is a tool to build container images from a Dockerfile, inside a container or Kubernetes cluster.";
+    description =
+      "kaniko is a tool to build container images from a Dockerfile, inside a container or Kubernetes cluster.";
     homepage = "https://github.com/GoogleContainerTools/kaniko";
     license = licenses.asl20;
     platforms = platforms.linux;

nix/manifest-tool.nix

@@ -15,7 +15,8 @@ pkgs.buildGoModule rec {
   checkPhase = "true";
 
   meta = with pkgs.lib; {
-    description = "Command line tool to create and query container image manifest list/indexes";
+    description =
+      "Command line tool to create and query container image manifest list/indexes";
     homepage = "https://github.com/estesp/manifest-tool";
     license = licenses.asl20;
     platforms = platforms.linux;

nix/toolchain.nix

@@ -1,6 +1,4 @@
-{
+{ system ? builtins.currentSystem, }:
-  system ? builtins.currentSystem,
-}:
 
 with import ./common.nix;
 
@@ -11,7 +9,8 @@ let
     #"aarch64-unknown-linux-musl"
     "armv6l-unknown-linux-musleabihf"
   ];
-  pkgsList = builtins.map (target: import pkgsSrc { 
+  pkgsList = builtins.map (target:
+    import pkgsSrc {
       inherit system;
       crossSystem = {
         config = target;
@@ -19,19 +18,14 @@ let
       };
       overlays = [ cargo2nixOverlay ];
     }) platforms;
-  pkgsHost = import pkgsSrc {};
+  pkgsHost = import pkgsSrc { };
   lib = pkgsHost.lib;
   kaniko = (import ./kaniko.nix) pkgsHost;
   winscp = (import ./winscp.nix) pkgsHost;
   manifestTool = (import ./manifest-tool.nix) pkgsHost;
-in 
+in lib.flatten (builtins.map (pkgs: [
-  lib.flatten (builtins.map (pkgs: [
   pkgs.rustPlatform.rust.rustc
   pkgs.rustPlatform.rust.cargo
   pkgs.buildPackages.stdenv.cc
-  ]) pkgsList) ++ [
+]) pkgsList) ++ [ kaniko winscp manifestTool ]
-    kaniko
-    winscp
-    manifestTool
-  ]
 

nix/winscp.nix

@@ -12,11 +12,11 @@ pkgs.stdenv.mkDerivation rec {
 
   buildPhase = ''
         cat > winscp <<EOF
-#!${pkgs.bash}/bin/bash
+    #!${pkgs.bash}/bin/bash
 
-WINEDEBUG=-all
+    WINEDEBUG=-all
-${pkgs.winePackages.minimal}/bin/wine $out/opt/WinSCP.com
+    ${pkgs.winePackages.minimal}/bin/wine $out/opt/WinSCP.com
-EOF
+    EOF
   '';
 
   installPhase = ''

shell.nix

@@ -1,6 +1,4 @@
-{
+{ system ? builtins.currentSystem, }:
-    system ? builtins.currentSystem,
-}:
 
 with import ./nix/common.nix;
 
@@ -13,11 +11,9 @@ let
   manifest-tool = (import ./nix/manifest-tool.nix) pkgs;
   winscp = (import ./nix/winscp.nix) pkgs;
 
-in
+in {
-  {
+  # --- Rust Shell ---
-    /* --- Rust Shell ---
+  # Use it to compile Garage
-     * Use it to compile Garage
-     */
   rust = pkgs.mkShell {
     nativeBuildInputs = [
       #pkgs.rustPlatform.rust.rustc
@@ -33,9 +29,8 @@ in
     ];
   };
 
-    /* --- Integration shell ---
+  # --- Integration shell ---
-     * Use it to test Garage with common S3 clients
+  # Use it to test Garage with common S3 clients
-     */
   integration = pkgs.mkShell {
     nativeBuildInputs = [
       winscp
@@ -52,21 +47,20 @@ in
     ];
   };
 
-    /* --- Release shell ---
+  # --- Release shell ---
-     * A shell built to make releasing easier
+  # A shell built to make releasing easier
-     */
   release = pkgs.mkShell {
     shellHook = ''
-function refresh_toolchain {
+      function refresh_toolchain {
         pass show deuxfleurs/nix_priv_key > /tmp/nix-signing-key.sec
         nix copy \
           --to 's3://nix?endpoint=garage.deuxfleurs.fr&region=garage&secret-key=/tmp/nix-signing-key.sec' \
           $(nix-store -qR \
             $(nix-build --no-build-output --no-out-link nix/toolchain.nix))
         rm /tmp/nix-signing-key.sec
-}
+      }
 
-function refresh_cache {
+      function refresh_cache {
         pass show deuxfleurs/nix_priv_key > /tmp/nix-signing-key.sec
         for attr in clippy.amd64 test.amd64 pkgs.{amd64,i386,arm,arm64}.{debug,release}; do
           echo "Updating cache for ''${attr}"
@@ -76,11 +70,11 @@ function refresh_cache {
             $(nix-store -qR ''${derivation%\!bin})
         done
         rm /tmp/nix-signing-key.sec
-}
+      }
 
-function refresh_flake_cache {
+      function refresh_flake_cache {
         pass show deuxfleurs/nix_priv_key > /tmp/nix-signing-key.sec
-  for attr in packages.x86_64-linux.default; do
+        for attr in packages.x86_64-linux.default devShell.x86_64-linux; do
           echo "Updating cache for ''${attr}"
           derivation=$(nix path-info --derivation ".#''${attr}")
           nix copy -j8 \
@@ -88,30 +82,30 @@ function refresh_flake_cache {
             $(nix-store -qR ''${derivation})
         done
         rm /tmp/nix-signing-key.sec
-}
+      }
 
-function to_s3 {
+      function to_s3 {
         aws \
             --endpoint-url https://garage.deuxfleurs.fr \
             --region garage \
           s3 cp \
             ./result-bin/bin/garage \
             s3://garagehq.deuxfleurs.fr/_releases/''${DRONE_TAG:-$DRONE_COMMIT}/''${TARGET}/garage
-}
+      }
 
-function to_docker {
+      function to_docker {
         executor  \
           --force \
           --customPlatform="''${DOCKER_PLATFORM}" \
           --destination "''${CONTAINER_NAME}:''${CONTAINER_TAG}" \
           --context dir://`pwd` \
           --verbosity=debug
-}
+      }
 
-function multiarch_docker {
+      function multiarch_docker {
               manifest-tool push from-spec <(cat <<EOF
-image: dxflrs/garage:''${CONTAINER_TAG}
+      image: dxflrs/garage:''${CONTAINER_TAG}
-manifests:
+      manifests:
         -
           image: dxflrs/arm64_garage:''${CONTAINER_TAG}
           platform:
@@ -132,11 +126,11 @@ manifests:
           platform:
             architecture: arm
             os: linux
-EOF
+      EOF
               )
-}
+      }
 
-function refresh_index {
+      function refresh_index {
         aws \
             --endpoint-url https://garage.deuxfleurs.fr \
             --region garage \
@@ -160,14 +154,9 @@ function refresh_index {
           s3 cp \
             result/share/_releases.html \
             s3://garagehq.deuxfleurs.fr/
-}
-        '';
-      nativeBuildInputs = [
-        pkgs.awscli2
-        kaniko 
-        manifest-tool
-      ];
-    };
       }
-
+    '';
+    nativeBuildInputs = [ pkgs.awscli2 kaniko manifest-tool ];
+  };
+}
 

src/garage/admin.rs

@@ -15,6 +15,7 @@ use garage_util::time::*;
 use garage_table::replication::*;
 use garage_table::*;
 
+use garage_rpc::ring::PARTITION_BITS;
 use garage_rpc::*;
 
 use garage_block::manager::BlockResyncErrorInfo;
@@ -783,6 +784,7 @@ impl AdminRpcHandler {
 			for node in ring.layout.node_ids().iter() {
 				let mut opt = opt.clone();
 				opt.all_nodes = false;
+				opt.skip_global = true;
 
 				writeln!(&mut ret, "\n======================").unwrap();
 				writeln!(&mut ret, "Stats for node {:?}:", node).unwrap();
@@ -799,6 +801,15 @@ impl AdminRpcHandler {
 					Err(e) => writeln!(&mut ret, "Network error: {}", e).unwrap(),
 				}
 			}
+
+			writeln!(&mut ret, "\n======================").unwrap();
+			write!(
+				&mut ret,
+				"Cluster statistics:\n\n{}",
+				self.gather_cluster_stats()
+			)
+			.unwrap();
+
 			Ok(AdminRpc::Ok(ret))
 		} else {
 			Ok(AdminRpc::Ok(self.gather_stats_local(opt)?))
@@ -819,22 +830,6 @@ impl AdminRpcHandler {
 
 		writeln!(&mut ret, "\nDatabase engine: {}", self.garage.db.engine()).unwrap();
 
-		// Gather ring statistics
-		let ring = self.garage.system.ring.borrow().clone();
-		let mut ring_nodes = HashMap::new();
-		for (_i, loc) in ring.partitions().iter() {
-			for n in ring.get_nodes(loc, ring.replication_factor).iter() {
-				if !ring_nodes.contains_key(n) {
-					ring_nodes.insert(*n, 0usize);
-				}
-				*ring_nodes.get_mut(n).unwrap() += 1;
-			}
-		}
-		writeln!(&mut ret, "\nRing nodes & partition count:").unwrap();
-		for (n, c) in ring_nodes.iter() {
-			writeln!(&mut ret, "  {:?} {}", n, c).unwrap();
-		}
-
 		// Gather table statistics
 		let mut table = vec!["  Table\tItems\tMklItems\tMklTodo\tGcTodo".into()];
 		table.push(self.gather_table_stats(&self.garage.bucket_table, opt.detailed)?);
@@ -881,12 +876,108 @@ impl AdminRpcHandler {
 		.unwrap();
 
 		if !opt.detailed {
-			writeln!(&mut ret, "\nIf values are missing (marked as NC), consider adding the --detailed flag - this will be slow.").unwrap();
+			writeln!(&mut ret, "\nIf values are missing above (marked as NC), consider adding the --detailed flag (this will be slow).").unwrap();
+		}
+
+		if !opt.skip_global {
+			write!(&mut ret, "\n{}", self.gather_cluster_stats()).unwrap();
 		}
 
 		Ok(ret)
 	}
 
+	fn gather_cluster_stats(&self) -> String {
+		let mut ret = String::new();
+
+		// Gather storage node and free space statistics
+		let layout = &self.garage.system.ring.borrow().layout;
+		let mut node_partition_count = HashMap::<Uuid, u64>::new();
+		for short_id in layout.ring_assignation_data.iter() {
+			let id = layout.node_id_vec[*short_id as usize];
+			*node_partition_count.entry(id).or_default() += 1;
+		}
+		let node_info = self
+			.garage
+			.system
+			.get_known_nodes()
+			.into_iter()
+			.map(|n| (n.id, n))
+			.collect::<HashMap<_, _>>();
+
+		let mut table = vec!["  ID\tHostname\tZone\tCapacity\tPart.\tDataAvail\tMetaAvail".into()];
+		for (id, parts) in node_partition_count.iter() {
+			let info = node_info.get(id);
+			let status = info.map(|x| &x.status);
+			let role = layout.roles.get(id).and_then(|x| x.0.as_ref());
+			let hostname = status.map(|x| x.hostname.as_str()).unwrap_or("?");
+			let zone = role.map(|x| x.zone.as_str()).unwrap_or("?");
+			let capacity = role.map(|x| x.capacity_string()).unwrap_or("?".into());
+			let avail_str = |x| match x {
+				Some((avail, total)) => {
+					let pct = (avail as f64) / (total as f64) * 100.;
+					let avail = bytesize::ByteSize::b(avail);
+					let total = bytesize::ByteSize::b(total);
+					format!("{}/{} ({:.1}%)", avail, total, pct)
+				}
+				None => "?".into(),
+			};
+			let data_avail = avail_str(status.and_then(|x| x.data_disk_avail));
+			let meta_avail = avail_str(status.and_then(|x| x.meta_disk_avail));
+			table.push(format!(
+				"  {:?}\t{}\t{}\t{}\t{}\t{}\t{}",
+				id, hostname, zone, capacity, parts, data_avail, meta_avail
+			));
+		}
+		write!(
+			&mut ret,
+			"Storage nodes:\n{}",
+			format_table_to_string(table)
+		)
+		.unwrap();
+
+		let meta_part_avail = node_partition_count
+			.iter()
+			.filter_map(|(id, parts)| {
+				node_info
+					.get(id)
+					.and_then(|x| x.status.meta_disk_avail)
+					.map(|c| c.0 / *parts)
+			})
+			.collect::<Vec<_>>();
+		let data_part_avail = node_partition_count
+			.iter()
+			.filter_map(|(id, parts)| {
+				node_info
+					.get(id)
+					.and_then(|x| x.status.data_disk_avail)
+					.map(|c| c.0 / *parts)
+			})
+			.collect::<Vec<_>>();
+		if !meta_part_avail.is_empty() && !data_part_avail.is_empty() {
+			let meta_avail =
+				bytesize::ByteSize(meta_part_avail.iter().min().unwrap() * (1 << PARTITION_BITS));
+			let data_avail =
+				bytesize::ByteSize(data_part_avail.iter().min().unwrap() * (1 << PARTITION_BITS));
+			writeln!(
+				&mut ret,
+				"\nEstimated available storage space cluster-wide (might be lower in practice):"
+			)
+			.unwrap();
+			if meta_part_avail.len() < node_partition_count.len()
+				|| data_part_avail.len() < node_partition_count.len()
+			{
+				writeln!(&mut ret, "  data: < {}", data_avail).unwrap();
+				writeln!(&mut ret, "  metadata: < {}", meta_avail).unwrap();
+				writeln!(&mut ret, "A precise estimate could not be given as information is missing for some storage nodes.").unwrap();
+			} else {
+				writeln!(&mut ret, "  data: {}", data_avail).unwrap();
+				writeln!(&mut ret, "  metadata: {}", meta_avail).unwrap();
+			}
+		}
+
+		ret
+	}
+
 	fn gather_table_stats<F, R>(
 		&self,
 		t: &Arc<Table<F, R>>,

src/garage/cli/cmd.rs

@@ -59,18 +59,29 @@ pub async fn cmd_status(rpc_cli: &Endpoint<SystemRpc, ()>, rpc_host: NodeID) ->
 	let layout = fetch_layout(rpc_cli, rpc_host).await?;
 
 	println!("==== HEALTHY NODES ====");
-	let mut healthy_nodes = vec!["ID\tHostname\tAddress\tTags\tZone\tCapacity".to_string()];
+	let mut healthy_nodes =
+		vec!["ID\tHostname\tAddress\tTags\tZone\tCapacity\tDataAvail\tMetaAvail".to_string()];
 	for adv in status.iter().filter(|adv| adv.is_up) {
 		match layout.roles.get(&adv.id) {
 			Some(NodeRoleV(Some(cfg))) => {
+				let data_avail = match &adv.status.data_disk_avail {
+					_ if cfg.capacity.is_none() => "N/A".into(),
+					Some((avail, total)) => {
+						let pct = (*avail as f64) / (*total as f64) * 100.;
+						let avail = bytesize::ByteSize::b(*avail);
+						format!("{} ({:.1}%)", avail, pct)
+					}
+					None => "?".into(),
+				};
 				healthy_nodes.push(format!(
-					"{id:?}\t{host}\t{addr}\t[{tags}]\t{zone}\t{capacity}",
+					"{id:?}\t{host}\t{addr}\t[{tags}]\t{zone}\t{capacity}\t{data_avail}",
 					id = adv.id,
 					host = adv.status.hostname,
 					addr = adv.addr,
 					tags = cfg.tags.join(","),
 					zone = cfg.zone,
 					capacity = cfg.capacity_string(),
+					data_avail = data_avail,
 				));
 			}
 			_ => {

src/garage/cli/structs.rs

@@ -504,6 +504,11 @@ pub struct StatsOpt {
 	/// Gather detailed statistics (this can be long)
 	#[structopt(short = "d", long = "detailed")]
 	pub detailed: bool,
+
+	/// Don't show global cluster stats (internal use in RPC)
+	#[structopt(skip)]
+	#[serde(default)]
+	pub skip_global: bool,
 }
 
 #[derive(Serialize, Deserialize, StructOpt, Debug, Eq, PartialEq, Clone)]

src/rpc/Cargo.toml

@@ -23,6 +23,7 @@ hex = "0.4"
 tracing = "0.1"
 rand = "0.8"
 sodiumoxide = { version = "0.2.5-0", package = "kuska-sodiumoxide" }
+systemstat = "0.2.3"
 
 async-trait = "0.1.7"
 serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }

src/rpc/lib.rs

@@ -3,6 +3,9 @@
 #[macro_use]
 extern crate tracing;
 
+mod metrics;
+mod system_metrics;
+
 #[cfg(feature = "consul-discovery")]
 mod consul;
 #[cfg(feature = "kubernetes-discovery")]
@@ -13,9 +16,6 @@ pub mod replication_mode;
 pub mod ring;
 pub mod system;
 
-mod metrics;
 pub mod rpc_helper;
 
 pub use rpc_helper::*;
-
-pub mod system_metrics;

src/rpc/system.rs

@@ -3,6 +3,7 @@ use std::collections::HashMap;
 use std::io::{Read, Write};
 use std::net::{IpAddr, SocketAddr};
 use std::path::{Path, PathBuf};
+use std::sync::atomic::Ordering;
 use std::sync::{Arc, RwLock};
 use std::time::{Duration, Instant};
 
@@ -38,7 +39,6 @@ use crate::replication_mode::*;
 use crate::ring::*;
 use crate::rpc_helper::*;
 
-#[cfg(feature = "metrics")]
 use crate::system_metrics::*;
 
 const DISCOVERY_INTERVAL: Duration = Duration::from_secs(60);
@@ -106,7 +106,7 @@ pub struct System {
 	consul_discovery: Option<ConsulDiscovery>,
 	#[cfg(feature = "kubernetes-discovery")]
 	kubernetes_discovery: Option<KubernetesDiscoveryConfig>,
-	#[cfg(feature = "metrics")]
+
 	metrics: SystemMetrics,
 
 	replication_mode: ReplicationMode,
@@ -118,18 +118,28 @@ pub struct System {
 
 	/// Path to metadata directory
 	pub metadata_dir: PathBuf,
+	/// Path to data directory
+	pub data_dir: PathBuf,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct NodeStatus {
 	/// Hostname of the node
 	pub hostname: String,
+
 	/// Replication factor configured on the node
 	pub replication_factor: usize,
 	/// Cluster layout version
 	pub cluster_layout_version: u64,
 	/// Hash of cluster layout staging data
 	pub cluster_layout_staging_hash: Hash,
+
+	/// Disk usage on partition containing metadata directory (tuple: `(avail, total)`)
+	#[serde(default)]
+	pub meta_disk_avail: Option<(u64, u64)>,
+	/// Disk usage on partition containing data directory (tuple: `(avail, total)`)
+	#[serde(default)]
+	pub data_disk_avail: Option<(u64, u64)>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -271,18 +281,11 @@ impl System {
 			}
 		};
 
-		let local_status = NodeStatus {
-			hostname: gethostname::gethostname()
-				.into_string()
-				.unwrap_or_else(|_| "<invalid utf-8>".to_string()),
-			replication_factor,
-			cluster_layout_version: cluster_layout.version,
-			cluster_layout_staging_hash: cluster_layout.staging_hash,
-		};
-
-		#[cfg(feature = "metrics")]
 		let metrics = SystemMetrics::new(replication_factor);
 
+		let mut local_status = NodeStatus::initial(replication_factor, &cluster_layout);
+		local_status.update_disk_usage(&config.metadata_dir, &config.data_dir, &metrics);
+
 		let ring = Ring::new(cluster_layout, replication_factor);
 		let (update_ring, ring) = watch::channel(Arc::new(ring));
 
@@ -373,12 +376,12 @@ impl System {
 			consul_discovery,
 			#[cfg(feature = "kubernetes-discovery")]
 			kubernetes_discovery: config.kubernetes_discovery.clone(),
-			#[cfg(feature = "metrics")]
 			metrics,
 
 			ring,
 			update_ring: Mutex::new(update_ring),
 			metadata_dir: config.metadata_dir.clone(),
+			data_dir: config.data_dir.clone(),
 		});
 		sys.system_endpoint.set_handler(sys.clone());
 		Ok(sys)
@@ -416,12 +419,7 @@ impl System {
 					.get(&n.id.into())
 					.cloned()
 					.map(|(_, st)| st)
-					.unwrap_or(NodeStatus {
+					.unwrap_or(NodeStatus::unknown()),
-						hostname: "?".to_string(),
-						replication_factor: 0,
-						cluster_layout_version: 0,
-						cluster_layout_staging_hash: Hash::from([0u8; 32]),
-					}),
 			})
 			.collect::<Vec<_>>();
 		known_nodes
@@ -600,6 +598,9 @@ impl System {
 		let ring = self.ring.borrow();
 		new_si.cluster_layout_version = ring.layout.version;
 		new_si.cluster_layout_staging_hash = ring.layout.staging_hash;
+
+		new_si.update_disk_usage(&self.metadata_dir, &self.data_dir, &self.metrics);
+
 		self.local_status.swap(Arc::new(new_si));
 	}
 
@@ -864,6 +865,69 @@ impl EndpointHandler<SystemRpc> for System {
 	}
 }
 
+impl NodeStatus {
+	fn initial(replication_factor: usize, layout: &ClusterLayout) -> Self {
+		NodeStatus {
+			hostname: gethostname::gethostname()
+				.into_string()
+				.unwrap_or_else(|_| "<invalid utf-8>".to_string()),
+			replication_factor,
+			cluster_layout_version: layout.version,
+			cluster_layout_staging_hash: layout.staging_hash,
+			meta_disk_avail: None,
+			data_disk_avail: None,
+		}
+	}
+
+	fn unknown() -> Self {
+		NodeStatus {
+			hostname: "?".to_string(),
+			replication_factor: 0,
+			cluster_layout_version: 0,
+			cluster_layout_staging_hash: Hash::from([0u8; 32]),
+			meta_disk_avail: None,
+			data_disk_avail: None,
+		}
+	}
+
+	fn update_disk_usage(&mut self, meta_dir: &Path, data_dir: &Path, metrics: &SystemMetrics) {
+		use systemstat::{Platform, System};
+		let mounts = System::new().mounts().unwrap_or_default();
+
+		let mount_avail = |path: &Path| {
+			mounts
+				.iter()
+				.filter(|x| path.starts_with(&x.fs_mounted_on))
+				.max_by_key(|x| x.fs_mounted_on.len())
+				.map(|x| (x.avail.as_u64(), x.total.as_u64()))
+		};
+
+		self.meta_disk_avail = mount_avail(meta_dir);
+		self.data_disk_avail = mount_avail(data_dir);
+
+		if let Some((avail, total)) = self.meta_disk_avail {
+			metrics
+				.values
+				.meta_disk_avail
+				.store(avail, Ordering::Relaxed);
+			metrics
+				.values
+				.meta_disk_total
+				.store(total, Ordering::Relaxed);
+		}
+		if let Some((avail, total)) = self.data_disk_avail {
+			metrics
+				.values
+				.data_disk_avail
+				.store(avail, Ordering::Relaxed);
+			metrics
+				.values
+				.data_disk_total
+				.store(total, Ordering::Relaxed);
+		}
+	}
+}
+
 fn get_default_ip() -> Option<IpAddr> {
 	pnet_datalink::interfaces()
 		.iter()

src/rpc/system_metrics.rs

@@ -1,14 +1,31 @@
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::Arc;
+
 use opentelemetry::{global, metrics::*, KeyValue};
 
 /// TableMetrics reference all counter used for metrics
 pub struct SystemMetrics {
 	pub(crate) _garage_build_info: ValueObserver<u64>,
 	pub(crate) _replication_factor: ValueObserver<u64>,
+	pub(crate) _disk_avail: ValueObserver<u64>,
+	pub(crate) _disk_total: ValueObserver<u64>,
+	pub(crate) values: Arc<SystemMetricsValues>,
+}
+
+#[derive(Default)]
+pub struct SystemMetricsValues {
+	pub(crate) data_disk_total: AtomicU64,
+	pub(crate) data_disk_avail: AtomicU64,
+	pub(crate) meta_disk_total: AtomicU64,
+	pub(crate) meta_disk_avail: AtomicU64,
 }
 
 impl SystemMetrics {
 	pub fn new(replication_factor: usize) -> Self {
 		let meter = global::meter("garage_system");
+		let values = Arc::new(SystemMetricsValues::default());
+		let values1 = values.clone();
+		let values2 = values.clone();
 		Self {
 			_garage_build_info: meter
 				.u64_value_observer("garage_build_info", move |observer| {
@@ -28,6 +45,33 @@ impl SystemMetrics {
 				})
 				.with_description("Garage replication factor setting")
 				.init(),
+			_disk_avail: meter
+				.u64_value_observer("garage_local_disk_avail", move |observer| {
+					match values1.data_disk_avail.load(Ordering::Relaxed) {
+						0 => (),
+						x => observer.observe(x, &[KeyValue::new("volume", "data")]),
+					};
+					match values1.meta_disk_avail.load(Ordering::Relaxed) {
+						0 => (),
+						x => observer.observe(x, &[KeyValue::new("volume", "metadata")]),
+					};
+				})
+				.with_description("Garage available disk space on each node")
+				.init(),
+			_disk_total: meter
+				.u64_value_observer("garage_local_disk_total", move |observer| {
+					match values2.data_disk_total.load(Ordering::Relaxed) {
+						0 => (),
+						x => observer.observe(x, &[KeyValue::new("volume", "data")]),
+					};
+					match values2.meta_disk_total.load(Ordering::Relaxed) {
+						0 => (),
+						x => observer.observe(x, &[KeyValue::new("volume", "metadata")]),
+					};
+				})
+				.with_description("Garage total disk space on each node")
+				.init(),
+			values,
 		}
 	}
 }