checks: add backup test

checks/backups/flake-module.nix

@@ -0,0 +1,125 @@
+{ self, ... }:
+let
+  clan = self.lib.buildClan {
+    clanName = "testclan";
+    directory = ../..;
+    machines = {
+      test_backup_client = {
+        imports = [ self.nixosModules.test_backup_client ];
+        fileSystems."/".device = "/dev/null";
+        boot.loader.grub.device = "/dev/null";
+      };
+    };
+  };
+in
+{
+  flake.nixosConfigurations = { inherit (clan.nixosConfigurations) test_backup_client; };
+  flake.clanInternals = clan.clanInternals;
+  flake.nixosModules = {
+    test_backup_server = { ... }: {
+      imports = [
+        self.clanModules.borgbackup
+      ];
+      services.sshd.enable = true;
+      services.borgbackup.repos.testrepo = {
+        authorizedKeys = [
+          (builtins.readFile ../borgbackup/borg_test.pub)
+        ];
+      };
+    };
+    test_backup_client = { pkgs, lib, ... }:
+      let
+        dependencies = [
+          self
+          pkgs.stdenv.drvPath
+        ] ++ builtins.map (i: i.outPath) (builtins.attrValues self.inputs);
+        closureInfo = pkgs.closureInfo { rootPaths = dependencies; };
+      in
+      {
+        imports = [
+          self.clanModules.borgbackup
+        ];
+        networking.hostName = "client";
+        services.sshd.enable = true;
+        users.users.root.openssh.authorizedKeys.keyFiles = [
+          ../borgbackup/borg_test.pub
+        ];
+        environment.systemPackages = [ self.packages.${pkgs.system}.clan-cli ];
+        environment.etc."install-closure".source = "${closureInfo}/store-paths";
+        nix.settings = {
+          substituters = lib.mkForce [ ];
+          hashed-mirrors = null;
+          connect-timeout = lib.mkForce 3;
+          flake-registry = pkgs.writeText "flake-registry" ''{"flakes":[],"version":2}'';
+        };
+        system.extraDependencies = dependencies;
+        clanCore.state.test-backups.folders = [ "/var/test-backups" ];
+        clan.borgbackup = {
+          enable = true;
+          destinations.test_backup_server = {
+            repo = "borg@server:.";
+            rsh = "ssh -i /root/.ssh/id_ed25519 -o StrictHostKeyChecking=no";
+          };
+        };
+      };
+  };
+  perSystem = { nodes, pkgs, ... }: {
+    checks.test-backups =
+      (import ../lib/test-base.nix)
+        {
+          name = "test-backups";
+          nodes.server = {
+            imports = [
+              self.nixosModules.test_backup_server
+              self.nixosModules.clanCore
+              {
+                clanCore.machineName = "server";
+                clanCore.clanDir = ../..;
+              }
+            ];
+          };
+          nodes.client = {
+            imports = [
+              self.nixosModules.test_backup_client
+              self.nixosModules.clanCore
+              {
+                clanCore.machineName = "client";
+                clanCore.clanDir = ../..;
+              }
+            ];
+          };
+
+          testScript = ''
+            import json
+            start_all()
+
+            # setup
+            client.succeed("mkdir -m 700 /root/.ssh")
+            client.succeed(
+                "cat ${../borgbackup/borg_test} > /root/.ssh/id_ed25519"
+            )
+            client.succeed("chmod 600 /root/.ssh/id_ed25519")
+            client.wait_for_unit("sshd", timeout=30)
+            print(client.succeed("ssh -o StrictHostKeyChecking=accept-new -v root@client hostname"))
+
+            # dummy data
+            client.succeed("mkdir /var/test-backups")
+            client.succeed("echo testing > /var/test-backups/somefile")
+
+            # create
+            client.succeed("clan --flake ${../..} backups create test_backup_client")
+            client.wait_until_succeeds("! systemctl is-active borgbackup-job-test_backup_server")
+
+            # list
+            backup_id = json.loads(client.succeed("borg-job-test_backup_server list --json"))["archives"][0]["archive"]
+            assert(backup_id in client.succeed("clan --flake ${../..} backups list test_backup_client"))
+
+            # restore
+            client.succeed("rm -f /var/test-backups/somefile")
+            client.succeed(f"clan --flake ${../..} backups restore test_backup_client borgbackup {backup_id}")
+            assert(client.succeed("cat /var/test-backups/somefile").strip() == "testing")
+          '';
+        }
+        { inherit pkgs self; };
+  };
+}

checks/flake-module.nix

@@ -1,6 +1,7 @@
 { self, ... }: {
   imports = [
     ./impure/flake-module.nix
+    ./backups/flake-module.nix
   ];
   perSystem = { pkgs, lib, self', ... }: {
     checks =