Merge pull request #180 from ambroisie/add-home-manager

Add home-manager module

.github/workflows/ci.yaml

@@ -25,8 +25,17 @@ jobs:
     - run: nix build .#doc
     - run: nix fmt . -- --check
     - run: nix flake check
-    - run: |
+    - name: "Install nix-darwin module"
+      run: |
         system=$(nix build --no-link --print-out-paths .#checks.x86_64-darwin.integration)
         ${system}/activate-user
         sudo ${system}/activate
-    - run: sudo /run/current-system/sw/bin/agenix-integration
+    - name: "Test nix-darwin module"
+      run: |
+        sudo /run/current-system/sw/bin/agenix-integration
+    - name: "Test home-manager module"
+      run: |
+        # Do the job of `home-manager switch` in-line to avoid rate limiting
+        nix build .#homeConfigurations.integration-darwin.activationPackage
+        ./result/activate
+        ~/agenix-home-integration/bin/agenix-home-integration

flake.lock

@@ -21,6 +21,26 @@
         "type": "github"
       }
     },
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1682203081,
+        "narHash": "sha256-kRL4ejWDhi0zph/FpebFYhzqlOBrk0Pl3dzGEKSAlEw=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "32d3e39c491e2f91152c84f8ad8b003420eab0a1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1677676435,
@@ -40,6 +60,7 @@
     "root": {
       "inputs": {
         "darwin": "darwin",
+        "home-manager": "home-manager",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -7,12 +7,17 @@
       url = "github:lnl7/nix-darwin/master";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    home-manager = {
+      url = "github:nix-community/home-manager";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = {
     self,
     nixpkgs,
     darwin,
+    home-manager,
   }: let
     agenix = system: nixpkgs.legacyPackages.${system}.callPackage ./pkgs/agenix.nix {};
     doc = system: nixpkgs.legacyPackages.${system}.callPackage ./pkgs/doc.nix {};
@@ -23,6 +28,9 @@
     darwinModules.age = import ./modules/age.nix;
     darwinModules.default = self.darwinModules.age;
 
+    homeManagerModules.age = import ./modules/age-home.nix;
+    homeManagerModules.default = self.homeManagerModules.age;
+
     overlays.default = import ./overlay.nix;
 
     formatter.x86_64-darwin = nixpkgs.legacyPackages.x86_64-darwin.alejandra;
@@ -49,24 +57,46 @@
     packages.x86_64-linux.agenix = agenix "x86_64-linux";
     packages.x86_64-linux.default = self.packages.x86_64-linux.agenix;
     packages.x86_64-linux.doc = doc "x86_64-linux";
-    checks.x86_64-linux.integration = import ./test/integration.nix {
-      inherit nixpkgs;
-      pkgs = nixpkgs.legacyPackages.x86_64-linux;
-      system = "x86_64-linux";
-    };
-    checks."aarch64-darwin".integration =
-      (darwin.lib.darwinSystem {
-        system = "aarch64-darwin";
-        modules = [./test/integration_darwin.nix "${darwin.outPath}/pkgs/darwin-installer/installer.nix"];
-      })
-      .system;
-    checks."x86_64-darwin".integration =
-      (darwin.lib.darwinSystem {
-        system = "x86_64-darwin";
-        modules = [./test/integration_darwin.nix "${darwin.outPath}/pkgs/darwin-installer/installer.nix"];
-      })
-      .system;
 
-    darwinConfigurations.integration.system = self.checks."x86_64-darwin".integration;
+    checks =
+      nixpkgs.lib.genAttrs ["aarch64-darwin" "x86_64-darwin"] (system: {
+        integration =
+          (darwin.lib.darwinSystem {
+            inherit system;
+            modules = [
+              ./test/integration_darwin.nix
+              "${darwin.outPath}/pkgs/darwin-installer/installer.nix"
+              home-manager.darwinModules.home-manager
+              {
+                home-manager = {
+                  verbose = true;
+                  useGlobalPkgs = true;
+                  useUserPackages = true;
+                  backupFileExtension = "hmbak";
+                  users.runner = ./test/integration_hm_darwin.nix;
+                };
+              }
+            ];
+          })
+          .system;
+      })
+      // {
+        x86_64-linux.integration = import ./test/integration.nix {
+          inherit nixpkgs home-manager;
+          pkgs = nixpkgs.legacyPackages.x86_64-linux;
+          system = "x86_64-linux";
+        };
+      };
+
+    darwinConfigurations.integration-x86_64.system = self.checks.x86_64-darwin.integration;
+    darwinConfigurations.integration-aarch64.system = self.checks.aarch64-darwin.integration;
+
+    # Work-around for https://github.com/nix-community/home-manager/issues/3075
+    legacyPackages = nixpkgs.lib.genAttrs ["aarch64-darwin" "x86_64-darwin"] (system: {
+      homeConfigurations.integration-darwin = home-manager.lib.homeManagerConfiguration {
+        pkgs = nixpkgs.legacyPackages.${system};
+        modules = [./test/integration_hm_darwin.nix];
+      };
+    });
   };
 }

modules/age-home.nix

@@ -0,0 +1,234 @@
+{
+  config,
+  options,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.age;
+
+  ageBin = lib.getExe config.age.package;
+
+  newGeneration = ''
+    _agenix_generation="$(basename "$(readlink "${cfg.secretsDir}")" || echo 0)"
+    (( ++_agenix_generation ))
+    echo "[agenix] creating new generation in ${cfg.secretsMountPoint}/$_agenix_generation"
+    mkdir -p "${cfg.secretsMountPoint}"
+    chmod 0751 "${cfg.secretsMountPoint}"
+    mkdir -p "${cfg.secretsMountPoint}/$_agenix_generation"
+    chmod 0751 "${cfg.secretsMountPoint}/$_agenix_generation"
+  '';
+
+  setTruePath = secretType: ''
+    ${
+      if secretType.symlink
+      then ''
+        _truePath="${cfg.secretsMountPoint}/$_agenix_generation/${secretType.name}"
+      ''
+      else ''
+        _truePath="${secretType.path}"
+      ''
+    }
+  '';
+
+  installSecret = secretType: ''
+    ${setTruePath secretType}
+    echo "decrypting '${secretType.file}' to '$_truePath'..."
+    TMP_FILE="$_truePath.tmp"
+
+    IDENTITIES=()
+    # shellcheck disable=2043
+    for identity in ${toString cfg.identityPaths}; do
+      test -r "$identity" || continue
+      IDENTITIES+=(-i)
+      IDENTITIES+=("$identity")
+    done
+
+    test "''${#IDENTITIES[@]}" -eq 0 && echo "[agenix] WARNING: no readable identities found!"
+
+    mkdir -p "$(dirname "$_truePath")"
+    [ "${secretType.path}" != "${cfg.secretsDir}/${secretType.name}" ] && mkdir -p "$(dirname "${secretType.path}")"
+    (
+      umask u=r,g=,o=
+      test -f "${secretType.file}" || echo '[agenix] WARNING: encrypted file ${secretType.file} does not exist!'
+      test -d "$(dirname "$TMP_FILE")" || echo "[agenix] WARNING: $(dirname "$TMP_FILE") does not exist!"
+      LANG=${config.i18n.defaultLocale or "C"} ${ageBin} --decrypt "''${IDENTITIES[@]}" -o "$TMP_FILE" "${secretType.file}"
+    )
+    chmod ${secretType.mode} "$TMP_FILE"
+    mv -f "$TMP_FILE" "$_truePath"
+
+    ${optionalString secretType.symlink ''
+      [ "${secretType.path}" != "${cfg.secretsDir}/${secretType.name}" ] && ln -sfn "${cfg.secretsDir}/${secretType.name}" "${secretType.path}"
+    ''}
+  '';
+
+  testIdentities =
+    map
+    (path: ''
+      test -f ${path} || echo '[agenix] WARNING: config.age.identityPaths entry ${path} not present!'
+    '')
+    cfg.identityPaths;
+
+  cleanupAndLink = ''
+    _agenix_generation="$(basename "$(readlink "${cfg.secretsDir}")" || echo 0)"
+    (( ++_agenix_generation ))
+    echo "[agenix] symlinking new secrets to ${cfg.secretsDir} (generation $_agenix_generation)..."
+    ln -sfn "${cfg.secretsMountPoint}/$_agenix_generation" "${cfg.secretsDir}"
+
+    (( _agenix_generation > 1 )) && {
+    echo "[agenix] removing old secrets (generation $(( _agenix_generation - 1 )))..."
+    rm -rf "${cfg.secretsMountPoint}/$(( _agenix_generation - 1 ))"
+    }
+  '';
+
+  installSecrets = builtins.concatStringsSep "\n" (
+    ["echo '[agenix] decrypting secrets...'"]
+    ++ testIdentities
+    ++ (map installSecret (builtins.attrValues cfg.secrets))
+    ++ [cleanupAndLink]
+  );
+
+  secretType = types.submodule ({
+    config,
+    name,
+    ...
+  }: {
+    options = {
+      name = mkOption {
+        type = types.str;
+        default = name;
+        description = ''
+          Name of the file used in ''${cfg.secretsDir}
+        '';
+      };
+      file = mkOption {
+        type = types.path;
+        description = ''
+          Age file the secret is loaded from.
+        '';
+      };
+      path = mkOption {
+        type = types.str;
+        default = "${cfg.secretsDir}/${config.name}";
+        description = ''
+          Path where the decrypted secret is installed.
+        '';
+      };
+      mode = mkOption {
+        type = types.str;
+        default = "0400";
+        description = ''
+          Permissions mode of the decrypted secret in a format understood by chmod.
+        '';
+      };
+      symlink = mkEnableOption "symlinking secrets to their destination" // {default = true;};
+    };
+  });
+
+  mountingScript = let
+    app = pkgs.writeShellApplication {
+      name = "agenix-home-manager-mount-secrets";
+      runtimeInputs = with pkgs; [coreutils];
+      text = ''
+        ${newGeneration}
+        ${installSecrets}
+        exit 0
+      '';
+    };
+  in
+    lib.getExe app;
+
+  userDirectory = dir: let
+    inherit (pkgs.stdenv.hostPlatform) isDarwin;
+    baseDir =
+      if isDarwin
+      then "$(getconf DARWIN_USER_TEMP_DIR)"
+      else "$XDG_RUNTIME_DIR";
+  in "${baseDir}/${dir}";
+
+  userDirectoryDescription = dir: ''
+    "$XDG_RUNTIME_DIR"/${dir} on linux or "$(getconf DARWIN_USER_TEMP_DIR)"/${dir} on darwin.
+  '';
+in {
+  options.age = {
+    package = mkPackageOption pkgs "rage" {};
+
+    secrets = mkOption {
+      type = types.attrsOf secretType;
+      default = {};
+      description = ''
+        Attrset of secrets.
+      '';
+    };
+
+    identityPaths = mkOption {
+      type = types.listOf types.path;
+      default = [
+        "${config.home.homeDirectory}/.ssh/id_ed25519"
+        "${config.home.homeDirectory}/.ssh/id_rsa"
+      ];
+      defaultText = litteralExpression ''
+        [
+          "''${config.home.homeDirectory}/.ssh/id_ed25519"
+          "''${config.home.homeDirectory}/.ssh/id_rsa"
+        ]
+      '';
+      description = ''
+        Path to SSH keys to be used as identities in age decryption.
+      '';
+    };
+
+    secretsDir = mkOption {
+      type = types.str;
+      default = userDirectory "agenix";
+      defaultText = userDirectoryDescription "agenix";
+      description = ''
+        Folder where secrets are symlinked to
+      '';
+    };
+
+    secretsMountPoint = mkOption {
+      default = userDirectory "agenix.d";
+      defaultText = userDirectoryDescription "agenix.d";
+      description = ''
+        Where secrets are created before they are symlinked to ''${cfg.secretsDir}
+      '';
+    };
+  };
+
+  config = mkIf (cfg.secrets != {}) {
+    assertions = [
+      {
+        assertion = cfg.identityPaths != [];
+        message = "age.identityPaths must be set.";
+      }
+    ];
+
+    systemd.user.services.agenix = lib.mkIf pkgs.stdenv.hostPlatform.isLinux {
+      Unit = {
+        Description = "agenix activation";
+      };
+      Service = {
+        Type = "oneshot";
+        ExecStart = mountingScript;
+      };
+      Install.WantedBy = ["default.target"];
+    };
+
+    launchd.agents.activate-agenix = {
+      enable = true;
+      config = {
+        ProgramArguments = [mountingScript];
+        KeepAlive = {
+          Crashed = false;
+          SuccessfulExit = false;
+        };
+        RunAtLoad = true;
+        ProcessType = "Background";
+        StandardOutPath = "${config.home.homeDirectory}/Library/Logs/agenix/stdout";
+        StandardErrorPath = "${config.home.homeDirectory}/Library/Logs/agenix/stderr";
+      };
+    };
+  };
+}

test/install_ssh_host_keys_darwin.nix

@@ -1,10 +1,17 @@
 # Do not copy this! It is insecure. This is only okay because we are testing.
 {
   system.activationScripts.extraUserActivation.text = ''
-    echo "Installing SSH host key"
+    echo "Installing system SSH host key"
     sudo cp ${../example_keys/system1.pub} /etc/ssh/ssh_host_ed25519_key.pub
     sudo cp ${../example_keys/system1} /etc/ssh/ssh_host_ed25519_key
     sudo chmod 644 /etc/ssh/ssh_host_ed25519_key.pub
     sudo chmod 600 /etc/ssh/ssh_host_ed25519_key
+
+    echo "Installing user SSH host key"
+    mkdir -p $HOME/.ssh
+    cp ${../example_keys/user1.pub} $HOME/.ssh/id_ed25519.pub
+    cp ${../example_keys/user1} $HOME/.ssh/id_ed25519
+    chmod 644 $HOME/.ssh/id_ed25519.pub
+    chmod 600 $HOME/.ssh/id_ed25519
   '';
 }

test/integration.nix

@@ -6,6 +6,7 @@
       config = {};
     },
   system ? builtins.currentSystem,
+  home-manager ? <home-manager>,
 }:
 pkgs.nixosTest {
   name = "agenix-integration";
@@ -18,6 +19,7 @@ pkgs.nixosTest {
     imports = [
       ../modules/age.nix
       ./install_ssh_host_keys.nix
+      "${home-manager}/nixos"
     ];
 
     services.openssh.enable = true;
@@ -43,11 +45,28 @@ pkgs.nixosTest {
         };
       };
     };
+
+    home-manager.users.user1 = {options, ...}: {
+      imports = [
+        ../modules/age-home.nix
+      ];
+
+      home.stateVersion = pkgs.lib.trivial.release;
+
+      age = {
+        identityPaths = options.age.identityPaths.default ++ ["/home/user1/.ssh/this_key_wont_exist"];
+        secrets.secret2 = {
+          # Only decryptable by user1's key
+          file = ../example/secret2.age;
+        };
+      };
+    };
   };
 
   testScript = let
     user = "user1";
     password = "password1234";
+    secret2 = "world!";
   in ''
     system1.wait_for_unit("multi-user.target")
     system1.wait_until_succeeds("pgrep -f 'agetty.*tty1'")
@@ -65,6 +84,9 @@ pkgs.nixosTest {
     system1.send_chars("whoami > /tmp/1\n")
     system1.wait_for_file("/tmp/1")
     assert "${user}" in system1.succeed("cat /tmp/1")
+    system1.send_chars("cat /run/user/$(id -u)/agenix/secret2 > /tmp/2\n")
+    system1.wait_for_file("/tmp/2")
+    assert "${secret2}" in system1.succeed("cat /tmp/2")
 
     userDo = lambda input : f"sudo -u user1 -- bash -c 'set -eou pipefail; cd /tmp/secrets; {input}'"
 

test/integration_darwin.nix

@@ -8,7 +8,7 @@
   testScript = pkgs.writeShellApplication {
     name = "agenix-integration";
     text = ''
-      grep ${secret} ${config.age.secrets.secret1.path}
+      grep "${secret}" "${config.age.secrets.system-secret.path}"
     '';
   };
 in {
@@ -19,9 +19,10 @@ in {
 
   services.nix-daemon.enable = true;
 
-  age.identityPaths = options.age.identityPaths.default ++ ["/etc/ssh/this_key_wont_exist"];
-
-  age.secrets.secret1.file = ../example/secret1.age;
+  age = {
+    identityPaths = options.age.identityPaths.default ++ ["/etc/ssh/this_key_wont_exist"];
+    secrets.system-secret.file = ../example/secret1.age;
+  };
 
   environment.systemPackages = [testScript];
 }

test/integration_hm_darwin.nix

@@ -0,0 +1,33 @@
+{
+  pkgs,
+  config,
+  options,
+  lib,
+  ...
+}: {
+  imports = [../modules/age-home.nix];
+
+  age = {
+    identityPaths = options.age.identityPaths.default ++ ["/Users/user1/.ssh/this_key_wont_exist"];
+    secrets.user-secret.file = ../example/secret2.age;
+  };
+
+  home = rec {
+    username = "runner";
+    homeDirectory = lib.mkForce "/Users/${username}";
+    stateVersion = lib.trivial.release;
+  };
+
+  home.file = let
+    name = "agenix-home-integration";
+  in {
+    ${name}.source = pkgs.writeShellApplication {
+      inherit name;
+      text = let
+        secret = "world!";
+      in ''
+        diff -q "${config.age.secrets.user-secret.path}" <(printf '${secret}\n')
+      '';
+    };
+  };
+}