Separate fetch and update steps

[auto-upgrade-with-pinch] / modules / auto-upgrade.nix

diff --git a/modules/auto-upgrade.nix b/modules/auto-upgrade.nix
index 3a0d25d4d20f148ddd6f4d447a273950a03ac618..aabb0e2dcc4c6a530e9f9b40b2f456a797bb4143 100644 (file)
--- a/modules/auto-upgrade.nix
+++ b/modules/auto-upgrade.nix
@@ -3,16 +3,49 @@ with lib;
 let
   cfg = config.system.autoUpgradeWithPinch;
   auto-upgrade-script = pkgs.writeShellScript "auto-upgrade" ''
-    flock /run/auto-upgrade-with-pinch ${
+    ${pkgs.utillinux}/bin/flock /run/auto-upgrade-with-pinch ${
       pkgs.writeShellScript "auto-upgrade-with-lock-held" ''
         set -e
+
+        in_tmpdir() {
+          d=$(mktemp -d)
+          pushd "$d"
+          "$@"
+          popd
+          rm -r "$d"
+        }
+
+        as_user() {
+          ${
+            if cfg.userEnvironment.enable then ''
+              /run/wrappers/bin/sudo -u ${escapeShellArg cfg.userEnvironment.user} "$@"
+            '' else ''
+              :
+            ''
+          }
+        }
+
+        # Fetch updates
         (
           cd /etc/nixos
-          ${pkgs.keyedgit cfg.key}/bin/git pull --ff-only --verify-signatures
-          ${pkgs.pinch}/bin/pinch update channels
+          ${pkgs.git}/bin/git fetch
+          PATH="${pkgs.keyedgit cfg.keys}/bin:$PATH" ${pkgs.polite-merge}/bin/polite-merge --ff-only --verify-signatures
         )
 
-        ${config.system.build.nixos-rebuild}/bin/nixos-rebuild switch --no-build-output
+        # Update channels
+        ${pkgs.pinch}/bin/pinch update /etc/nixos/channels
+
+        # Build
+        in_tmpdir ${config.system.build.nixos-rebuild}/bin/nixos-rebuild build
+        as_user nix-build --no-out-link '<nixpkgs>' -A ${
+          escapeShellArg cfg.userEnvironment.package
+        }
+
+        # Install
+        ${config.system.build.nixos-rebuild}/bin/nixos-rebuild switch
+        as_user nix-env -f '<nixpkgs>' -riA ${
+          escapeShellArg cfg.userEnvironment.package
+        }
       ''
     }
   '';
@@ -41,13 +74,49 @@ in {
         '';
       };
 
-      key = mkOption {
+      keys = mkOption {
         type = types.path;
         description = ''
-          GPG key that signs updates.  Updates are only merged if the commit
-          at the tip of the remote branch is signed with this key.
+          File containing GPG keys that sign updates.  Updates are only merged
+          if the commit at the tip of the remote branch is signed with one of
+          these keys.
         '';
       };
+
+      userEnvironment = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = ''
+            Whether to update a user-environment as well.  This update is done
+            with nix-env -riA.  Note the -r!  I.e., ALL OTHER PACKAGES INSTALLED
+            WITH nix-env WILL BE DELETED!
+
+            This presumes that you have configured an "entire user environment"
+            package as shown in
+            https://nixos.wiki/wiki/FAQ#How_can_I_manage_software_with_nix-env_like_with_configuration.nix.3F
+
+            To check if you're set up for this, run "nix-env --query".  If it
+            only lists one package, you're good to go.
+          '';
+        };
+
+        user = mkOption {
+          type = types.str;
+          description = ''
+            The username of the user whose environment should be updated.
+          '';
+        };
+
+        package = mkOption {
+          type = types.str;
+          example = "nixos.userPackages";
+          description = ''
+            The name of the single package that is the user's entire environment.
+          '';
+        };
+
+      };
     };
   };
 
@@ -70,9 +139,10 @@ in {
     nixpkgs.overlays = [
       (import ../overlays/keyedgit.nix)
       (import ../overlays/pinch.nix)
+      (import ../overlays/polite-merge.nix)
       (self: super: {
         auto-upgrade = super.writeShellScriptBin "auto-upgrade" ''
-          sudo ${auto-upgrade-script}
+          /run/wrappers/bin/sudo ${auto-upgrade-script}
         '';
       })
     ];
@@ -123,5 +193,11 @@ in {
 
       startAt = cfg.dates;
     };
+
+    assertions = [{
+      assertion = cfg.userEnvironment.enable -> cfg.enable;
+      message =
+        "User environment upgrades cannot yet be enabled separately from system upgrades.";
+    }];
   };
 }