everywhere: support unix sockets when binding in various places

this patch implements binding to paths as a unix socket for generic
server and web server.

Cargo.lock

@@ -1271,6 +1271,7 @@ dependencies = [
  "http-range",
  "httpdate",
  "hyper",
+ "hyperlocal",
  "idna",
  "md-5",
  "multer",
@@ -1377,6 +1378,7 @@ dependencies = [
  "kube",
  "kuska-sodiumoxide",
  "netapp",
+ "nix",
  "opentelemetry",
  "pnet_datalink",
  "rand",
@@ -1385,7 +1387,6 @@ dependencies = [
  "serde",
  "serde_bytes",
  "serde_json",
- "systemstat",
  "tokio",
  "tokio-stream",
  "tracing",
@@ -1459,8 +1460,10 @@ dependencies = [
  "garage_util",
  "http",
  "hyper",
+ "hyperlocal",
  "opentelemetry",
  "percent-encoding",
+ "tokio",
  "tracing",
 ]
 
@@ -1770,6 +1773,19 @@ dependencies = [
  "tokio-io-timeout",
 ]
 
+[[package]]
+name = "hyperlocal"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fafdf7b2b2de7c9784f76e02c0935e65a8117ec3b768644379983ab333ac98c"
+dependencies = [
+ "futures-util",
+ "hex",
+ "hyper",
+ "pin-project",
+ "tokio",
+]
+
 [[package]]
 name = "iana-time-zone"
 version = "0.1.57"
@@ -2292,6 +2308,17 @@ dependencies = [
  "tokio-util 0.7.8",
 ]
 
+[[package]]
+name = "nix"
+version = "0.27.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"
+dependencies = [
+ "bitflags 2.4.0",
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "no-std-net"
 version = "0.6.0"
@@ -3534,20 +3561,6 @@ 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 0.3.28",
- "winapi",
-]
-
 [[package]]
 name = "tempfile"
 version = "3.8.0"

Cargo.nix

@@ -33,7 +33,7 @@ args@{
   ignoreLockHash,
 }:
 let
-  nixifiedLockHash = "3e3f41f614ab470ecb4b06c670cd6a84c443d799d01f1d48f1d251872099c468";
+  nixifiedLockHash = "b73d35e98dc62acc3b01aba2cb825ba6e99217e46781b8c59f8e0ceef34e79d6";
   workspaceSrc = if args.workspaceSrc == null then ./. else args.workspaceSrc;
   currentLockHash = builtins.hashFile "sha256" (workspaceSrc + /Cargo.lock);
   lockHashIgnored = if ignoreLockHash
@@ -1809,6 +1809,7 @@ in
       http_range = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".http-range."0.1.5" { inherit profileName; }).out;
       httpdate = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".httpdate."1.0.3" { inherit profileName; }).out;
       hyper = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".hyper."0.14.27" { inherit profileName; }).out;
+      hyperlocal = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".hyperlocal."0.8.0" { inherit profileName; }).out;
       idna = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".idna."0.4.0" { inherit profileName; }).out;
       md5 = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".md-5."0.10.5" { inherit profileName; }).out;
       multer = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".multer."2.1.0" { inherit profileName; }).out;
@@ -1961,6 +1962,7 @@ in
       ${ if rootFeatures' ? "garage/kubernetes-discovery" || rootFeatures' ? "garage_rpc/kube" || rootFeatures' ? "garage_rpc/kubernetes-discovery" then "kube" else null } = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".kube."0.75.0" { inherit profileName; }).out;
       sodiumoxide = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".kuska-sodiumoxide."0.2.5-0" { inherit profileName; }).out;
       netapp = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".netapp."0.5.2" { inherit profileName; }).out;
+      nix = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".nix."0.27.1" { inherit profileName; }).out;
       opentelemetry = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".opentelemetry."0.17.0" { inherit profileName; }).out;
       pnet_datalink = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".pnet_datalink."0.33.0" { inherit profileName; }).out;
       rand = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".rand."0.8.5" { inherit profileName; }).out;
@@ -1969,7 +1971,6 @@ in
       serde = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde."1.0.188" { inherit profileName; }).out;
       serde_bytes = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde_bytes."0.11.12" { inherit profileName; }).out;
       serde_json = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde_json."1.0.105" { 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."1.32.0" { inherit profileName; }).out;
       tokio_stream = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio-stream."0.1.14" { inherit profileName; }).out;
       tracing = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tracing."0.1.37" { inherit profileName; }).out;
@@ -2059,8 +2060,10 @@ in
       garage_util = (rustPackages."unknown".garage_util."0.8.4" { inherit profileName; }).out;
       http = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".http."0.2.9" { inherit profileName; }).out;
       hyper = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".hyper."0.14.27" { inherit profileName; }).out;
+      hyperlocal = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".hyperlocal."0.8.0" { inherit profileName; }).out;
       opentelemetry = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".opentelemetry."0.17.0" { inherit profileName; }).out;
       percent_encoding = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".percent-encoding."2.3.0" { inherit profileName; }).out;
+      tokio = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio."1.32.0" { inherit profileName; }).out;
       tracing = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tracing."0.1.37" { inherit profileName; }).out;
     };
   });
@@ -2486,6 +2489,23 @@ in
     };
   });
   
+  "registry+https://github.com/rust-lang/crates.io-index".hyperlocal."0.8.0" = overridableMkRustCrate (profileName: rec {
+    name = "hyperlocal";
+    version = "0.8.0";
+    registry = "registry+https://github.com/rust-lang/crates.io-index";
+    src = fetchCratesIo { inherit name version; sha256 = "0fafdf7b2b2de7c9784f76e02c0935e65a8117ec3b768644379983ab333ac98c"; };
+    features = builtins.concatLists [
+      [ "server" ]
+    ];
+    dependencies = {
+      futures_util = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".futures-util."0.3.28" { inherit profileName; }).out;
+      hex = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".hex."0.4.3" { inherit profileName; }).out;
+      hyper = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".hyper."0.14.27" { inherit profileName; }).out;
+      pin_project = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".pin-project."1.1.3" { inherit profileName; }).out;
+      tokio = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio."1.32.0" { inherit profileName; }).out;
+    };
+  });
+  
   "registry+https://github.com/rust-lang/crates.io-index".iana-time-zone."0.1.57" = overridableMkRustCrate (profileName: rec {
     name = "iana-time-zone";
     version = "0.1.57";
@@ -2956,7 +2976,7 @@ in
     src = fetchCratesIo { inherit name version; sha256 = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"; };
     features = builtins.concatLists [
       [ "default" ]
-      (lib.optional (rootFeatures' ? "garage/opentelemetry-otlp" || rootFeatures' ? "garage/telemetry-otlp" || rootFeatures' ? "garage_db/cli" || rootFeatures' ? "garage_db/pretty_env_logger") "extra_traits")
+      [ "extra_traits" ]
       [ "std" ]
     ];
   });
@@ -3232,6 +3252,21 @@ in
     };
   });
   
+  "registry+https://github.com/rust-lang/crates.io-index".nix."0.27.1" = overridableMkRustCrate (profileName: rec {
+    name = "nix";
+    version = "0.27.1";
+    registry = "registry+https://github.com/rust-lang/crates.io-index";
+    src = fetchCratesIo { inherit name version; sha256 = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"; };
+    features = builtins.concatLists [
+      [ "fs" ]
+    ];
+    dependencies = {
+      bitflags = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".bitflags."2.4.0" { inherit profileName; }).out;
+      cfg_if = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".cfg-if."1.0.0" { inherit profileName; }).out;
+      libc = (rustPackages."registry+https://github.com/rust-lang/crates.io-index".libc."0.2.147" { inherit profileName; }).out;
+    };
+  });
+  
   "registry+https://github.com/rust-lang/crates.io-index".no-std-net."0.6.0" = overridableMkRustCrate (profileName: rec {
     name = "no-std-net";
     version = "0.6.0";
@@ -5001,21 +5036,6 @@ 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."1.3.0" { 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."0.2.147" { 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."0.3.28" { 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."3.8.0" = overridableMkRustCrate (profileName: rec {
     name = "tempfile";
     version = "3.8.0";
@@ -6035,7 +6055,6 @@ in
       [ "ntsecapi" ]
       [ "ntstatus" ]
       (lib.optional (rootFeatures' ? "garage/kubernetes-discovery" || rootFeatures' ? "garage_rpc/kube" || rootFeatures' ? "garage_rpc/kubernetes-discovery") "objbase")
-      [ "pdh" ]
       [ "processenv" ]
       (lib.optional (rootFeatures' ? "garage/default" || rootFeatures' ? "garage/sled" || rootFeatures' ? "garage_db/default" || rootFeatures' ? "garage_db/sled" || rootFeatures' ? "garage_model/default" || rootFeatures' ? "garage_model/sled") "processthreadsapi")
       [ "profileapi" ]
@@ -6049,7 +6068,6 @@ in
       [ "winerror" ]
       [ "winnt" ]
       [ "winsock2" ]
-      [ "ws2def" ]
       [ "ws2ipdef" ]
       [ "ws2tcpip" ]
       [ "wtypesbase" ]

doc/talks/.gitignore

@@ -0,0 +1 @@
+.direnv/

doc/talks/2023-09-20-ocp/.gitignore

@@ -0,0 +1,17 @@
+*
+
+!*.txt
+!*.md
+
+!assets
+
+!.gitignore
+!*.svg
+!*.png
+!*.jpg
+!*.tex
+!Makefile
+!.gitignore
+!assets/*.drawio.pdf
+
+!talk.pdf

doc/talks/2023-09-20-ocp/Makefile

@@ -0,0 +1,34 @@
+ASSETS=assets/consistent_hashing_1.pdf \
+	   assets/consistent_hashing_2.pdf \
+	   assets/consistent_hashing_3.pdf \
+	   assets/consistent_hashing_4.pdf \
+	   assets/garage_tables.pdf \
+	   assets/consensus.pdf_tex \
+	   assets/lattice1.pdf_tex \
+	   assets/lattice2.pdf_tex \
+	   assets/lattice3.pdf_tex \
+	   assets/lattice4.pdf_tex \
+	   assets/lattice5.pdf_tex \
+	   assets/lattice6.pdf_tex \
+	   assets/lattice7.pdf_tex \
+	   assets/lattice8.pdf_tex \
+	   assets/latticeB_1.pdf_tex \
+	   assets/latticeB_2.pdf_tex \
+	   assets/latticeB_3.pdf_tex \
+	   assets/latticeB_4.pdf_tex \
+	   assets/latticeB_5.pdf_tex \
+	   assets/latticeB_6.pdf_tex \
+	   assets/latticeB_7.pdf_tex \
+	   assets/latticeB_8.pdf_tex \
+	   assets/latticeB_9.pdf_tex \
+	   assets/latticeB_10.pdf_tex \
+	   assets/deuxfleurs.pdf
+
+talk.pdf: talk.tex $(ASSETS)
+	pdflatex talk.tex
+
+assets/%.pdf: assets/%.svg
+	inkscape -D -z --file=$^ --export-pdf=$@
+
+assets/%.pdf_tex: assets/%.svg
+	inkscape -D -z --file=$^ --export-pdf=$@ --export-latex

doc/talks/2023-09-20-ocp/abstract.md

@@ -0,0 +1,39 @@
+### (fr) Garage, un système de stockage de données géo-distribué léger et robuste
+
+Garage est un système de stockage de données léger, géo-distribué, qui
+implémente le protocole de stockage S3 de Amazon. Garage est destiné
+principalement à l'auto-hébergement sur du matériel courant d'occasion. À ce
+titre, il doit tolérer un grand nombre de pannes: coupures de courant, coupures
+de connexion Internet, pannes de machines, ... Il doit également être facile à
+déployer et à maintenir, afin de pouvoir être facilement utilisé par des
+amateurs ou des petites organisations.
+
+Cette présentation vous proposera un aperçu de Garage et du choix technique
+principal qui rend un système comme Garage possible: le refus d'utiliser des
+algorithmes de consensus, remplacés avantageusement par des méthodes à
+cohérence faible.  Notre modèle est fortement inspiré de la base de donnée
+Dynamo (DeCandia et al, 2007), et fait usage des types de données CRDT (Shapiro
+et al, 2011).  Nous exploreront comment ces méthodes s'appliquent à la
+construction de l'abstraction "stockage objet" dans un système distribué, et
+quelles autres abstractions peuvent ou ne peuvent pas être construites dans ce
+modèle.
+
+### (en) Garage, a lightweight and robust geo-distributed data storage system
+
+Garage is a lightweight geo-distributed data store that implements the Amazon
+S3 object storage protocol.  Garage is meant primarily for self-hosting at home
+on second-hand commodity hardware, meaning it has to tolerate a wide variety of
+failure scenarios such as power cuts, Internet disconnections and machine
+crashes. It also has to be easy to deploy and maintain, so that hobbyists and
+small organizations can use it without trouble. 
+
+This talk will present Garage and the key technical choice that made Garage
+possible: refusing to use consensus algorithms and using instead weak
+consistency methods, with a model that is loosely based on that of the Dynamo
+database (DeCandia et al, 2007) and that makes heavy use of conflict-free
+replicated data types (Shapiro et al, 2011).  We will explore how these methods
+are suited to building the "object store" abstraction in a distributed system,
+and what other abstractions are possible or impossible to build in this model.
+
+
+

doc/talks/2023-09-20-ocp/assets/consensus.svg

@@ -0,0 +1,137 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="800"
+   height="300"
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+   version="1.1"
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+   inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+   sodipodi:docname="consensus.svg"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
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+     pagecolor="#ffffff"
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+    <text
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+         id="tspan3748-6"
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+    <text
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+         id="tspan3705"
+         style="stroke-width:0.264583;fill:#000000"
+         x="6.9525447"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan3705-5"
+         style="fill:#000000;stroke-width:0.264583"
+         x="6.9525447"
+         y="65.261436">$read()$:</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan3748"
+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
+         y="24.042637">$\sqsupseteq \{a\} \to$ OK</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan3748-2"
+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
+         y="33.02087">$\sqsupseteq \{a\} \to$ OK</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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+         id="tspan3748-6"
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+         x="23.457415"
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+       id="path3663-6-6-4"
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+    <text
+       xml:space="preserve"
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+       id="text3750-7"><tspan
+         sodipodi:role="line"
+         id="tspan3748-65"
+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan4278"
+         style="fill:#000000;stroke-width:0.264583"
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+    <text
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+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan3705-5"
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+    <text
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+         id="tspan3748"
+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
+         y="24.042637">$\sqsupseteq \{a\} \to$ OK</tspan></text>
+    <text
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+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         x="23.457415"
+         y="33.02087">$\sqsupseteq \{a\} \to$ OK</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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+         id="tspan3748-6"
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+    <circle
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+       id="path3663-6-6-4"
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+    <text
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+         sodipodi:role="line"
+         id="tspan3748-65"
+         style="fill:#000000;stroke-width:0.264583"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan4278"
+         style="fill:#000000;stroke-width:0.264583"
+         x="14.395845"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan4278-7"
+         style="fill:#000000;stroke-width:0.264583"
+         x="14.395845"
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+         id="tspan3748-6-9"
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doc/talks/2023-09-20-ocp/assets/lattice8.svg

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+         id="tspan3748"
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+         id="tspan4278-7"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
+       x="23.457415"
+       y="33.02087"
+       id="text3750-3"><tspan
+         sodipodi:role="line"
+         id="tspan3748-2"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
+         y="33.02087">$\not\sqsupseteq \{a\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
+       x="23.457415"
+       y="41.972523"
+       id="text3750-0"><tspan
+         sodipodi:role="line"
+         id="tspan3748-6"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
+         y="41.972523">$\not\sqsupseteq \{a\}$</tspan></text>
+    <circle
+       style="fill:#ff0000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-1-4"
+       cx="18.004833"
+       cy="90.979645"
+       r="2.7302806" />
+    <circle
+       style="fill:#008000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-3-0-5"
+       cx="18.004833"
+       cy="81.949104"
+       r="2.7302806" />
+    <circle
+       style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-6-6-2"
+       cx="18.004833"
+       cy="72.918564"
+       r="2.7302806" />
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="6.9525447"
+       y="65.279381"
+       id="text3707-5"><tspan
+         sodipodi:role="line"
+         id="tspan3705-4"
+         style="fill:#000000;stroke-width:0.264583"
+         x="6.9525447"
+         y="65.279381">$write(\{b\})$:</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="59.340172"
+       y="118.94403"
+       id="text3707-5-3"><tspan
+         sodipodi:role="line"
+         id="tspan3705-4-6"
+         style="fill:#000000;stroke-width:0.264583"
+         x="59.340172"
+         y="118.94403">$read()$:</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
+       x="23.457415"
+       y="75.619804"
+       id="text3750-7"><tspan
+         sodipodi:role="line"
+         id="tspan3748-4"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
+         y="75.619804">$\not\sqsupseteq \{b\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="23.457415"
+       y="84.598038"
+       id="text3750-3-4"><tspan
+         sodipodi:role="line"
+         id="tspan3748-2-3"
+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
+         y="84.598038">$\sqsupseteq \{b\} \to$ OK</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
+       x="23.457415"
+       y="93.54969"
+       id="text3750-0-0"><tspan
+         sodipodi:role="line"
+         id="tspan3748-6-7"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
+         y="93.54969">$\not\sqsupseteq \{b\}$</tspan></text>
+    <circle
+       style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-6"
+       cx="118.63729"
+       cy="67.630196"
+       r="2.7302806" />
+    <circle
+       style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-6-6-0"
+       cx="67.201363"
+       cy="124.91125"
+       r="2.7302806" />
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="72.653946"
+       y="127.6125"
+       id="text3750-9"><tspan
+         sodipodi:role="line"
+         id="tspan3748-3"
+         style="fill:#000000;stroke-width:0.264583"
+         x="72.653946"
+         y="127.6125">$\to \{a\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="62.764446"
+       y="146.3129"
+       id="text4280-6"><tspan
+         sodipodi:role="line"
+         style="fill:#000000;stroke-width:0.264583"
+         x="62.764446"
+         y="146.3129"
+         id="tspan2630">return $\{a\}$</tspan></text>
+    <circle
+       style="fill:#ff0000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-3-0-7"
+       cx="67.201363"
+       cy="133.94179"
+       r="2.7302806" />
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="72.653946"
+       y="136.59073"
+       id="text3750-3-6"><tspan
+         sodipodi:role="line"
+         id="tspan3748-2-0"
+         style="fill:#000000;stroke-width:0.264583"
+         x="72.653946"
+         y="136.59073">$\to \{\}$</tspan></text>
+    <circle
+       style="fill:#ff0000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-6-6-0-6"
+       cx="174.36296"
+       cy="124.91125"
+       r="2.7302806" />
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="179.81555"
+       y="127.6125"
+       id="text3750-9-1"><tspan
+         sodipodi:role="line"
+         id="tspan3748-3-8"
+         style="fill:#000000;stroke-width:0.264583"
+         x="179.81555"
+         y="127.6125">$\to \{\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="162.7999"
+       y="118.94403"
+       id="text3707-5-3-7"><tspan
+         sodipodi:role="line"
+         id="tspan3705-4-6-5"
+         style="fill:#000000;stroke-width:0.264583"
+         x="162.7999"
+         y="118.94403">$read()$:</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583"
+       x="134.97845"
+       y="132.58472"
+       id="text3899"><tspan
+         sodipodi:role="line"
+         id="tspan3897"
+         style="stroke-width:0.264583"
+         x="134.97845"
+         y="132.58472">;</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="169.92604"
+       y="146.3129"
+       id="text4280-6-7"><tspan
+         sodipodi:role="line"
+         style="fill:#000000;stroke-width:0.264583"
+         x="169.92604"
+         y="146.3129"
+         id="tspan2630-9">return $\{b\}$</tspan></text>
+    <circle
+       style="fill:#008000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-3-0-7-2"
+       cx="174.36296"
+       cy="133.94179"
+       r="2.7302806" />
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="179.81555"
+       y="136.59073"
+       id="text3750-3-6-0"><tspan
+         sodipodi:role="line"
+         id="tspan3748-2-0-2"
+         style="fill:#000000;stroke-width:0.264583"
+         x="179.81555"
+         y="136.59073">$\to \{b\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;text-align:end;text-anchor:end;fill:#ff0000;stroke-width:0.264583"
+       x="259.75"
+       y="135.53111"
+       id="text9043"><tspan
+         sodipodi:role="line"
+         id="tspan9041"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="259.75"
+         y="135.53111">${\Large\textbf{??!}}$~~~~~</tspan><tspan
+         sodipodi:role="line"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="259.75"
+         y="146.11446"
+         id="tspan9372">$\{a\} \not\sqsubseteq \{b\}$</tspan></text>
+  </g>
+</svg>

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+         y="13.702217">$write(\{a\})$:</tspan></text>
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+         id="tspan3748"
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+         x="23.457415"
+         y="24.042637">$\sqsupseteq \{a\} \to$ OK</tspan></text>
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+    <text
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+         x="23.457415"
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+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
+         y="84.598038">$\sqsupseteq \{b\} \to$ OK</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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+    <text
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+         style="fill:#000000;stroke-width:0.264583"
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+         id="tspan3748-2-0"
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+    <path
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+    <circle
+       style="fill:#ff0000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
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+       cx="147.35568"
+       cy="95.24971"
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+    <circle
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+    <circle
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+       cx="18.004833"
+       cy="39.402473"
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+    <circle
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+       cx="18.004833"
+       cy="30.371933"
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+    <circle
+       style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
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+       cx="18.004833"
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+    <text
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+       y="13.702217"
+       id="text3707"><tspan
+         sodipodi:role="line"
+         id="tspan3705"
+         style="fill:#000000;stroke-width:0.264583"
+         x="6.9525447"
+         y="13.702217">$write(\{a\})$:</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+       id="text3750"><tspan
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+         id="tspan3748"
+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
+         y="24.042637">$\sqsupseteq \{a\} \to$ OK</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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+         id="tspan3748-2"
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+         x="23.457415"
+         y="33.02087">$\not\sqsupseteq \{a\}$</tspan></text>
+    <text
+       xml:space="preserve"
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+       id="text3750-0"><tspan
+         sodipodi:role="line"
+         id="tspan3748-6"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
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+    <circle
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+    <text
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+       id="text3707-5-3"><tspan
+         sodipodi:role="line"
+         id="tspan3705-4-6"
+         style="fill:#000000;stroke-width:0.264583"
+         x="59.340172"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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+         sodipodi:role="line"
+         id="tspan3748-4"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
+         y="75.619804">$\not\sqsupseteq \{b\}$</tspan></text>
+    <text
+       xml:space="preserve"
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+       id="text3750-3-4"><tspan
+         sodipodi:role="line"
+         id="tspan3748-2-3"
+         style="fill:#000000;stroke-width:0.264583"
+         x="23.457415"
+         y="84.598038">$\sqsupseteq \{b\} \to$ OK</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
+       x="23.457415"
+       y="93.54969"
+       id="text3750-0-0"><tspan
+         sodipodi:role="line"
+         id="tspan3748-6-7"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
+         y="93.54969">$\not\sqsupseteq \{b\}$</tspan></text>
+    <circle
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+       id="path3663-6"
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+       cy="67.630196"
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+    <circle
+       style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-6-6-0"
+       cx="67.201363"
+       cy="124.91125"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+       y="127.6125"
+       id="text3750-9"><tspan
+         sodipodi:role="line"
+         id="tspan3748-3"
+         style="fill:#000000;stroke-width:0.264583"
+         x="72.653946"
+         y="127.6125">$\to \{a\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+       id="text4280-6"><tspan
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+         style="fill:#000000;stroke-width:0.264583"
+         x="62.764446"
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+         id="tspan2630">return $\{a\}$</tspan></text>
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+       id="path3663-3-0-7"
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+    <text
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+       id="text3750-3-6"><tspan
+         sodipodi:role="line"
+         id="tspan3748-2-0"
+         style="fill:#000000;stroke-width:0.264583"
+         x="72.653946"
+         y="136.59073">$\to \{\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+       id="text3707-5-3-7"><tspan
+         sodipodi:role="line"
+         id="tspan3705-4-6-5"
+         style="fill:#000000;stroke-width:0.264583"
+         x="162.7999"
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+    <text
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+       id="text3899"><tspan
+         sodipodi:role="line"
+         id="tspan3897"
+         style="stroke-width:0.264583"
+         x="134.97845"
+         y="132.58472">;</tspan></text>
+  </g>
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+         style="fill:#000000;stroke-width:0.264583"
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+    <text
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+         id="tspan3748-2-0"
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+         id="tspan3748-3-8"
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+    <circle
+       style="fill:#008000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-3-0-5"
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+    <circle
+       style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
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+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         sodipodi:role="line"
+         id="tspan3705-4"
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+         y="65.279381">$write(\{b\})$:</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         sodipodi:role="line"
+         id="tspan3705-4-6"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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+         sodipodi:role="line"
+         id="tspan3748-4"
+         style="fill:#999999;stroke-width:0.264583"
+         x="23.457415"
+         y="75.619804">$\not\sqsupseteq \{b\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         id="tspan3748-2-3"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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+       style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
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+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         x="62.764446"
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+         id="tspan2630">return $\{a\}$</tspan></text>
+    <circle
+       style="fill:#ff0000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
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+         id="tspan3748-2-0"
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+         y="136.59073">$\to \{\}$</tspan></text>
+    <circle
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+       cy="124.91125"
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+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="179.81555"
+       y="127.6125"
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+         sodipodi:role="line"
+         id="tspan3748-3-8"
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+         y="127.6125">$\to \{\}$</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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+         y="118.94403">$read()$:</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583"
+       x="134.97845"
+       y="132.58472"
+       id="text3899"><tspan
+         sodipodi:role="line"
+         id="tspan3897"
+         style="stroke-width:0.264583"
+         x="134.97845"
+         y="132.58472">;</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="169.92604"
+       y="146.3129"
+       id="text4280-6-7"><tspan
+         sodipodi:role="line"
+         style="fill:#000000;stroke-width:0.264583"
+         x="169.92604"
+         y="146.3129"
+         id="tspan2630-9">return $\{b\}$</tspan></text>
+    <circle
+       style="fill:#008000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
+       id="path3663-3-0-7-2"
+       cx="174.36296"
+       cy="133.94179"
+       r="2.7302806" />
+    <text
+       xml:space="preserve"
+       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
+       x="179.81555"
+       y="136.59073"
+       id="text3750-3-6-0"><tspan
+         sodipodi:role="line"
+         id="tspan3748-2-0-2"
+         style="fill:#000000;stroke-width:0.264583"
+         x="179.81555"
+         y="136.59073">$\to \{b\}$</tspan></text>
+  </g>
+</svg>

src/api/Cargo.toml

@@ -45,6 +45,7 @@ http = "0.2"
 httpdate = "1.0"
 http-range = "0.1"
 hyper = { version = "0.14", features = ["server", "http1", "runtime", "tcp", "stream"] }
+hyperlocal = { version = "0.8.0", default-features = false, features = ["server"] }
 multer = "2.0"
 percent-encoding = "2.1.0"
 roxmltree = "0.18"

src/api/admin/api_server.rs

@@ -1,5 +1,4 @@
 use std::collections::HashMap;
-use std::net::SocketAddr;
 use std::sync::Arc;
 
 use async_trait::async_trait;
@@ -18,6 +17,7 @@ use prometheus::{Encoder, TextEncoder};
 use garage_model::garage::Garage;
 use garage_rpc::system::ClusterHealthStatus;
 use garage_util::error::Error as GarageError;
+use garage_util::socket_address::UnixOrTCPSocketAddress;
 
 use crate::generic_server::*;
 
@@ -61,7 +61,7 @@ impl AdminApiServer {
 
 	pub async fn run(
 		self,
-		bind_addr: SocketAddr,
+		bind_addr: UnixOrTCPSocketAddress,
 		shutdown_signal: impl Future<Output = ()>,
 	) -> Result<(), GarageError> {
 		let region = self.garage.config.s3_api.s3_region.clone();

src/api/generic_server.rs

@@ -1,4 +1,5 @@
-use std::net::SocketAddr;
+use std::fs::{self, Permissions};
+use std::os::unix::fs::PermissionsExt;
 use std::sync::Arc;
 
 use async_trait::async_trait;
@@ -11,6 +12,10 @@ use hyper::service::{make_service_fn, service_fn};
 use hyper::{Body, Request, Response, Server};
 use hyper::{HeaderMap, StatusCode};
 
+use hyperlocal::UnixServerExt;
+
+use tokio::net::UnixStream;
+
 use opentelemetry::{
 	global,
 	metrics::{Counter, ValueRecorder},
@@ -21,6 +26,7 @@ use opentelemetry::{
 use garage_util::error::Error as GarageError;
 use garage_util::forwarded_headers;
 use garage_util::metrics::{gen_trace_id, RecordDuration};
+use garage_util::socket_address::UnixOrTCPSocketAddress;
 
 pub(crate) trait ApiEndpoint: Send + Sync + 'static {
 	fn name(&self) -> &'static str;
@@ -91,10 +97,10 @@ impl<A: ApiHandler> ApiServer<A> {
 
 	pub async fn run_server(
 		self: Arc<Self>,
-		bind_addr: SocketAddr,
+		bind_addr: UnixOrTCPSocketAddress,
 		shutdown_signal: impl Future<Output = ()>,
 	) -> Result<(), GarageError> {
-		let service = make_service_fn(|conn: &AddrStream| {
+		let tcp_service = make_service_fn(|conn: &AddrStream| {
 			let this = self.clone();
 
 			let client_addr = conn.remote_addr();
@@ -102,28 +108,60 @@ impl<A: ApiHandler> ApiServer<A> {
 				Ok::<_, GarageError>(service_fn(move |req: Request<Body>| {
 					let this = this.clone();
 
-					this.handler(req, client_addr)
+					this.handler(req, client_addr.to_string())
 				}))
 			}
 		});
 
-		let server = Server::bind(&bind_addr).serve(service);
+		let unix_service = make_service_fn(|_: &UnixStream| {
+			let this = self.clone();
+
+			let path = bind_addr.to_string();
+			async move {
+				Ok::<_, GarageError>(service_fn(move |req: Request<Body>| {
+					let this = this.clone();
+
+					this.handler(req, path.clone())
+				}))
+			}
+		});
 
-		let graceful = server.with_graceful_shutdown(shutdown_signal);
 		info!(
-			"{} API server listening on http://{}",
+			"{} API server listening on {}",
 			A::API_NAME_DISPLAY,
 			bind_addr
 		);
 
-		graceful.await?;
+		match bind_addr {
+			UnixOrTCPSocketAddress::TCPSocket(addr) => {
+				Server::bind(&addr)
+					.serve(tcp_service)
+					.with_graceful_shutdown(shutdown_signal)
+					.await?
+			}
+			UnixOrTCPSocketAddress::UnixSocket(ref path) => {
+				if path.exists() {
+					fs::remove_file(path)?
+				}
+
+				let bound = Server::bind_unix(path)?;
+
+				fs::set_permissions(path, Permissions::from_mode(0o222))?;
+
+				bound
+					.serve(unix_service)
+					.with_graceful_shutdown(shutdown_signal)
+					.await?;
+			}
+		};
+
 		Ok(())
 	}
 
 	async fn handler(
 		self: Arc<Self>,
 		req: Request<Body>,
-		addr: SocketAddr,
+		addr: String,
 	) -> Result<Response<Body>, GarageError> {
 		let uri = req.uri().clone();
 

src/api/k2v/api_server.rs

@@ -1,4 +1,3 @@
-use std::net::SocketAddr;
 use std::sync::Arc;
 
 use async_trait::async_trait;
@@ -9,6 +8,7 @@ use hyper::{Body, Method, Request, Response};
 use opentelemetry::{trace::SpanRef, KeyValue};
 
 use garage_util::error::Error as GarageError;
+use garage_util::socket_address::UnixOrTCPSocketAddress;
 
 use garage_model::garage::Garage;
 
@@ -37,7 +37,7 @@ pub(crate) struct K2VApiEndpoint {
 impl K2VApiServer {
 	pub async fn run(
 		garage: Arc<Garage>,
-		bind_addr: SocketAddr,
+		bind_addr: UnixOrTCPSocketAddress,
 		s3_region: String,
 		shutdown_signal: impl Future<Output = ()>,
 	) -> Result<(), GarageError> {

src/api/s3/api_server.rs

@@ -1,4 +1,3 @@
-use std::net::SocketAddr;
 use std::sync::Arc;
 
 use async_trait::async_trait;
@@ -10,6 +9,7 @@ use hyper::{Body, Request, Response};
 use opentelemetry::{trace::SpanRef, KeyValue};
 
 use garage_util::error::Error as GarageError;
+use garage_util::socket_address::UnixOrTCPSocketAddress;
 
 use garage_model::garage::Garage;
 use garage_model::key_table::Key;
@@ -44,7 +44,7 @@ pub(crate) struct S3ApiEndpoint {
 impl S3ApiServer {
 	pub async fn run(
 		garage: Arc<Garage>,
-		addr: SocketAddr,
+		addr: UnixOrTCPSocketAddress,
 		s3_region: String,
 		shutdown_signal: impl Future<Output = ()>,
 	) -> Result<(), GarageError> {

src/garage/server.rs

@@ -79,7 +79,7 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 			"S3 API",
 			tokio::spawn(S3ApiServer::run(
 				garage.clone(),
-				*s3_bind_addr,
+				s3_bind_addr.clone(),
 				config.s3_api.s3_region.clone(),
 				wait_from(watch_cancel.clone()),
 			)),
@@ -94,7 +94,7 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 				"K2V API",
 				tokio::spawn(K2VApiServer::run(
 					garage.clone(),
-					config.k2v_api.as_ref().unwrap().api_bind_addr,
+					config.k2v_api.as_ref().unwrap().api_bind_addr.clone(),
 					config.s3_api.s3_region.clone(),
 					wait_from(watch_cancel.clone()),
 				)),
@@ -110,7 +110,7 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 			"Web",
 			tokio::spawn(WebServer::run(
 				garage.clone(),
-				web_config.bind_addr,
+				web_config.bind_addr.clone(),
 				web_config.root_domain.clone(),
 				wait_from(watch_cancel.clone()),
 			)),
@@ -121,7 +121,9 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 		info!("Launching Admin API server...");
 		servers.push((
 			"Admin",
-			tokio::spawn(admin_server.run(*admin_bind_addr, wait_from(watch_cancel.clone()))),
+			tokio::spawn(
+				admin_server.run(admin_bind_addr.clone(), wait_from(watch_cancel.clone())),
+			),
 		));
 	}
 
@@ -130,6 +132,11 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 		warn!("This Garage version is built without the metrics feature");
 	}
 
+	if servers.is_empty() {
+		// Nothing runs except netapp (not in servers)
+		// Await shutdown signal before proceeding to shutting down netapp
+		wait_from(watch_cancel).await;
+	} else {
 		// Stuff runs
 
 		// When a cancel signal is sent, stuff stops
@@ -142,8 +149,10 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 				info!("{} server exited without error.", desc);
 			}
 		}
+	}
 
 	// Remove RPC handlers for system to break reference cycles
+	info!("Deregistering RPC handlers for shutdown...");
 	garage.system.netapp.drop_all_handlers();
 	opentelemetry::global::shutdown_tracer_provider();
 

src/rpc/Cargo.toml

@@ -24,7 +24,7 @@ hex = "0.4"
 tracing = "0.1"
 rand = "0.8"
 sodiumoxide = { version = "0.2.5-0", package = "kuska-sodiumoxide" }
-systemstat = "0.2.3"
+nix = { version = "0.27", default-features = false, features = ["fs"] }
 
 async-trait = "0.1.7"
 serde = { version = "1.0", default-features = false, features = ["derive", "rc"] }

src/rpc/system.rs

@@ -9,10 +9,10 @@ use std::time::{Duration, Instant};
 
 use arc_swap::ArcSwap;
 use async_trait::async_trait;
-use futures::{join, select};
+use futures::join;
-use futures_util::future::*;
 use serde::{Deserialize, Serialize};
 use sodiumoxide::crypto::sign::ed25519;
+use tokio::select;
 use tokio::sync::watch;
 use tokio::sync::Mutex;
 
@@ -702,7 +702,7 @@ impl System {
 
 	async fn status_exchange_loop(&self, mut stop_signal: watch::Receiver<bool>) {
 		while !*stop_signal.borrow() {
-			let restart_at = tokio::time::sleep(STATUS_EXCHANGE_INTERVAL);
+			let restart_at = Instant::now() + STATUS_EXCHANGE_INTERVAL;
 
 			self.update_local_status();
 			let local_status: NodeStatus = self.local_status.load().as_ref().clone();
@@ -711,13 +711,14 @@ impl System {
 				.broadcast(
 					&self.system_endpoint,
 					SystemRpc::AdvertiseStatus(local_status),
-					RequestStrategy::with_priority(PRIO_HIGH),
+					RequestStrategy::with_priority(PRIO_HIGH)
+						.with_custom_timeout(STATUS_EXCHANGE_INTERVAL),
 				)
 				.await;
 
 			select! {
-				_ = restart_at.fuse() => {},
+				_ = tokio::time::sleep_until(restart_at.into()) => {},
-				_ = stop_signal.changed().fuse() => {},
+				_ = stop_signal.changed() => {},
 			}
 		}
 	}
@@ -799,10 +800,9 @@ impl System {
 			#[cfg(feature = "kubernetes-discovery")]
 			tokio::spawn(self.clone().advertise_to_kubernetes());
 
-			let restart_at = tokio::time::sleep(DISCOVERY_INTERVAL);
 			select! {
-				_ = restart_at.fuse() => {},
+				_ = tokio::time::sleep(DISCOVERY_INTERVAL) => {},
-				_ = stop_signal.changed().fuse() => {},
+				_ = stop_signal.changed() => {},
 			}
 		}
 	}
@@ -891,15 +891,14 @@ impl NodeStatus {
 	}
 
 	fn update_disk_usage(&mut self, meta_dir: &Path, data_dir: &Path, metrics: &SystemMetrics) {
-		use systemstat::{Platform, System};
+		use nix::sys::statvfs::statvfs;
-		let mounts = System::new().mounts().unwrap_or_default();
+		let mount_avail = |path: &Path| match statvfs(path) {
-
+			Ok(x) => {
-		let mount_avail = |path: &Path| {
+				let avail = x.blocks_available() * x.fragment_size() as u64;
-			mounts
+				let total = x.blocks() * x.fragment_size() as u64;
-				.iter()
+				Some((avail, total))
-				.filter(|x| path.starts_with(&x.fs_mounted_on))
+			}
-				.max_by_key(|x| x.fs_mounted_on.len())
+			Err(_) => None,
-				.map(|x| (x.avail.as_u64(), x.total.as_u64()))
 		};
 
 		self.meta_disk_avail = mount_avail(meta_dir);

src/util/config.rs

@@ -7,6 +7,7 @@ use std::path::PathBuf;
 use serde::{de, Deserialize};
 
 use crate::error::Error;
+use crate::socket_address::UnixOrTCPSocketAddress;
 
 /// Represent the whole configuration
 #[derive(Deserialize, Debug, Clone)]
@@ -102,7 +103,7 @@ pub struct Config {
 #[derive(Deserialize, Debug, Clone)]
 pub struct S3ApiConfig {
 	/// Address and port to bind for api serving
-	pub api_bind_addr: Option<SocketAddr>,
+	pub api_bind_addr: Option<UnixOrTCPSocketAddress>,
 	/// S3 region to use
 	pub s3_region: String,
 	/// Suffix to remove from domain name to find bucket. If None,
@@ -114,14 +115,14 @@ pub struct S3ApiConfig {
 #[derive(Deserialize, Debug, Clone)]
 pub struct K2VApiConfig {
 	/// Address and port to bind for api serving
-	pub api_bind_addr: SocketAddr,
+	pub api_bind_addr: UnixOrTCPSocketAddress,
 }
 
 /// Configuration for serving files as normal web server
 #[derive(Deserialize, Debug, Clone)]
 pub struct WebConfig {
 	/// Address and port to bind for web serving
-	pub bind_addr: SocketAddr,
+	pub bind_addr: UnixOrTCPSocketAddress,
 	/// Suffix to remove from domain name to find bucket
 	pub root_domain: String,
 }
@@ -130,7 +131,7 @@ pub struct WebConfig {
 #[derive(Deserialize, Debug, Clone, Default)]
 pub struct AdminConfig {
 	/// Address and port to bind for admin API serving
-	pub api_bind_addr: Option<SocketAddr>,
+	pub api_bind_addr: Option<UnixOrTCPSocketAddress>,
 
 	/// Bearer token to use to scrape metrics
 	pub metrics_token: Option<String>,

src/util/lib.rs

@@ -14,6 +14,7 @@ pub mod forwarded_headers;
 pub mod metrics;
 pub mod migrate;
 pub mod persister;
+pub mod socket_address;
 pub mod time;
 pub mod tranquilizer;
 pub mod version;

src/util/socket_address.rs

@@ -0,0 +1,44 @@
+use std::fmt::{Debug, Display, Formatter};
+use std::net::SocketAddr;
+use std::path::PathBuf;
+use std::str::FromStr;
+
+use serde::de::Error;
+use serde::{Deserialize, Deserializer};
+
+#[derive(Debug, Clone)]
+pub enum UnixOrTCPSocketAddress {
+	TCPSocket(SocketAddr),
+	UnixSocket(PathBuf),
+}
+
+impl Display for UnixOrTCPSocketAddress {
+	fn fmt(&self, formatter: &mut Formatter<'_>) -> std::fmt::Result {
+		match self {
+			UnixOrTCPSocketAddress::TCPSocket(address) => write!(formatter, "http://{}", address),
+			UnixOrTCPSocketAddress::UnixSocket(path) => {
+				write!(formatter, "http+unix://{}", path.to_string_lossy())
+			}
+		}
+	}
+}
+
+impl<'de> Deserialize<'de> for UnixOrTCPSocketAddress {
+	fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+	where
+		D: Deserializer<'de>,
+	{
+		let string = String::deserialize(deserializer)?;
+		let string = string.as_str();
+
+		if string.starts_with("/") {
+			Ok(UnixOrTCPSocketAddress::UnixSocket(
+				PathBuf::from_str(string).map_err(Error::custom)?,
+			))
+		} else {
+			Ok(UnixOrTCPSocketAddress::TCPSocket(
+				SocketAddr::from_str(string).map_err(Error::custom)?,
+			))
+		}
+	}
+}

src/web/Cargo.toml

@@ -27,5 +27,8 @@ futures = "0.3"
 
 http = "0.2"
 hyper = { version = "0.14", features = ["server", "http1", "runtime", "tcp", "stream"] }
+hyperlocal = { version = "0.8.0", default-features = false, features = ["server"] }
+
+tokio = { version = "1.0", default-features = false, features = ["net"] }
 
 opentelemetry = "0.17"

src/web/web_server.rs

@@ -1,4 +1,6 @@
-use std::{convert::Infallible, net::SocketAddr, sync::Arc};
+use std::fs::{self, Permissions};
+use std::os::unix::prelude::PermissionsExt;
+use std::{convert::Infallible, sync::Arc};
 
 use futures::future::Future;
 
@@ -9,6 +11,10 @@ use hyper::{
 	Body, Method, Request, Response, Server, StatusCode,
 };
 
+use hyperlocal::UnixServerExt;
+
+use tokio::net::UnixStream;
+
 use opentelemetry::{
 	global,
 	metrics::{Counter, ValueRecorder},
@@ -32,6 +38,7 @@ use garage_util::data::Uuid;
 use garage_util::error::Error as GarageError;
 use garage_util::forwarded_headers;
 use garage_util::metrics::{gen_trace_id, RecordDuration};
+use garage_util::socket_address::UnixOrTCPSocketAddress;
 
 struct WebMetrics {
 	request_counter: Counter<u64>,
@@ -69,7 +76,7 @@ impl WebServer {
 	/// Run a web server
 	pub async fn run(
 		garage: Arc<Garage>,
-		addr: SocketAddr,
+		addr: UnixOrTCPSocketAddress,
 		root_domain: String,
 		shutdown_signal: impl Future<Output = ()>,
 	) -> Result<(), GarageError> {
@@ -80,7 +87,7 @@ impl WebServer {
 			root_domain,
 		});
 
-		let service = make_service_fn(|conn: &AddrStream| {
+		let tcp_service = make_service_fn(|conn: &AddrStream| {
 			let web_server = web_server.clone();
 
 			let client_addr = conn.remote_addr();
@@ -88,23 +95,56 @@ impl WebServer {
 				Ok::<_, Error>(service_fn(move |req: Request<Body>| {
 					let web_server = web_server.clone();
 
-					web_server.handle_request(req, client_addr)
+					web_server.handle_request(req, client_addr.to_string())
 				}))
 			}
 		});
 
-		let server = Server::bind(&addr).serve(service);
+		let unix_service = make_service_fn(|_: &UnixStream| {
-		let graceful = server.with_graceful_shutdown(shutdown_signal);
+			let web_server = web_server.clone();
-		info!("Web server listening on http://{}", addr);
+
+			let path = addr.to_string();
+			async move {
+				Ok::<_, Error>(service_fn(move |req: Request<Body>| {
+					let web_server = web_server.clone();
+
+					web_server.handle_request(req, path.clone())
+				}))
+			}
+		});
+
+		info!("Web server listening on {}", addr);
+
+		match addr {
+			UnixOrTCPSocketAddress::TCPSocket(addr) => {
+				Server::bind(&addr)
+					.serve(tcp_service)
+					.with_graceful_shutdown(shutdown_signal)
+					.await?
+			}
+			UnixOrTCPSocketAddress::UnixSocket(ref path) => {
+				if path.exists() {
+					fs::remove_file(path)?
+				}
+
+				let bound = Server::bind_unix(path)?;
+
+				fs::set_permissions(path, Permissions::from_mode(0o222))?;
+
+				bound
+					.serve(unix_service)
+					.with_graceful_shutdown(shutdown_signal)
+					.await?;
+			}
+		};
 
-		graceful.await?;
 		Ok(())
 	}
 
 	async fn handle_request(
 		self: Arc<Self>,
 		req: Request<Body>,
-		addr: SocketAddr,
+		addr: String,
 	) -> Result<Response<Body>, Infallible> {
 		if let Ok(forwarded_for_ip_addr) =
 			forwarded_headers::handle_forwarded_for_headers(req.headers())