remove cachix

we aren't using it and it's somewhat in the way of our efforts to
improve scheduling and stuff.

buildbot_nix/__init__.py

@@ -316,25 +316,9 @@ def nix_eval_config(
     )
 
 
-@dataclass
-class CachixConfig:
-    name: str
-    signing_key_secret_name: str | None = None
-    auth_token_secret_name: str | None = None
-
-    def cachix_env(self) -> dict[str, str]:
-        env = {}
-        if self.signing_key_secret_name is not None:
-            env["CACHIX_SIGNING_KEY"] = util.Secret(self.signing_key_secret_name)
-        if self.auth_token_secret_name is not None:
-            env["CACHIX_AUTH_TOKEN"] = util.Secret(self.auth_token_secret_name)
-        return env
-
-
 def nix_build_config(
     project: GerritProject,
     worker_names: list[str],
-    cachix: CachixConfig | None = None,
     outputs_path: Path | None = None,
 ) -> util.BuilderConfig:
     """Builds one nix flake attribute."""
@@ -365,19 +349,6 @@ def nix_build_config(
             haltOnFailure=True,
         ),
     )
-    if cachix:
-        factory.addStep(
-            steps.ShellCommand(
-                name="Upload cachix",
-                env=cachix.cachix_env(),
-                command=[
-                    "cachix",
-                    "push",
-                    cachix.name,
-                    util.Interpolate("result-%(prop:attr)s"),
-                ],
-            ),
-        )
 
     factory.addStep(
         steps.ShellCommand(
@@ -468,7 +439,6 @@ def config_for_project(
     nix_eval_worker_count: int,
     nix_eval_max_memory_size: int,
     eval_lock: util.MasterLock,
-    cachix: CachixConfig | None = None,
     outputs_path: Path | None = None,
 ) -> Project:
     config["projects"].append(Project(project.name))
@@ -530,7 +500,6 @@ def config_for_project(
             nix_build_config(
                 project,
                 worker_names,
-                cachix=cachix,
                 outputs_path=outputs_path,
             ),
             nix_skipped_build_config(project, [SKIPPED_BUILDER_NAME]),
@@ -672,7 +641,6 @@ class GerritNixConfigurator(ConfiguratorBase):
         nix_eval_worker_count: int | None,
         nix_eval_max_memory_size: int,
         nix_workers_secret_name: str = "buildbot-nix-workers",  # noqa: S107
-        cachix: CachixConfig | None = None,
         outputs_path: str | None = None,
     ) -> None:
         super().__init__()
@@ -685,7 +653,6 @@ class GerritNixConfigurator(ConfiguratorBase):
         self.nix_supported_systems = nix_supported_systems
         self.gerrit_change_source = GerritChangeSource(gerrit_server, gerrit_user, gerritport=gerrit_port, identity_file=gerrit_sshkey_path)
         self.url = url
-        self.cachix = cachix
         if outputs_path is None:
             self.outputs_path = None
         else:
@@ -717,7 +684,6 @@ class GerritNixConfigurator(ConfiguratorBase):
             self.nix_eval_worker_count or multiprocessing.cpu_count(),
             self.nix_eval_max_memory_size,
             eval_lock,
-            self.cachix,
             self.outputs_path,
         )
 

examples/default.nix

@@ -46,14 +46,6 @@ in
           # optional nix-eval-jobs settings
           # evalWorkerCount = 8; # limit number of concurrent evaluations
           # evalMaxMemorySize = "2048"; # limit memory usage per evaluation
-
-          # optional cachix
-          #cachix = {
-          #  name = "my-cachix";
-          #  # One of the following is required:
-          #  signingKey = "/var/lib/secrets/cachix-key";
-          #  authToken = "/var/lib/secrets/cachix-token";
-          #};
         };
       })
       buildbot-nix.nixosModules.buildbot-master

nix/coordinator.nix

@@ -15,25 +15,6 @@ in
         default = "postgresql://@/buildbot";
         description = "Postgresql database url";
       };
-      cachix = {
-        name = lib.mkOption {
-          type = lib.types.nullOr lib.types.str;
-          default = null;
-          description = "Cachix name";
-        };
-
-        signingKeyFile = lib.mkOption {
-          type = lib.types.nullOr lib.types.path;
-          default = null;
-          description = "Cachix signing key";
-        };
-
-        authTokenFile = lib.mkOption {
-          type = lib.types.nullOr lib.types.str;
-          default = null;
-          description = "Cachix auth token";
-        };
-      };
       workersFile = lib.mkOption {
         type = lib.types.path;
         description = "File containing a list of nix workers";
@@ -88,13 +69,6 @@ in
       isSystemUser = true;
     };
 
-    assertions = [
-      {
-        assertion = cfg.cachix.name != null -> cfg.cachix.signingKeyFile != null || cfg.cachix.authTokenFile != null;
-        message = "if cachix.name is provided, then cachix.signingKeyFile and cachix.authTokenFile must be set";
-      }
-    ];
-
     services.buildbot-master = {
       enable = true;
 
@@ -106,7 +80,7 @@ in
       home = "/var/lib/buildbot";
       extraImports = ''
         from datetime import timedelta
-        from buildbot_nix import GerritNixConfigurator, CachixConfig
+        from buildbot_nix import GerritNixConfigurator
       '';
       configurators = [
         ''
@@ -150,11 +124,7 @@ in
         LoadCredential = [
           "buildbot-nix-workers:${cfg.workersFile}"
           "buildbot-oauth2-secret:${cfg.oauth2SecretFile}"
-        ]
+        ];
-        ++ lib.optional (cfg.cachix.signingKeyFile != null)
-          "cachix-signing-key:${builtins.toString cfg.cachix.signingKeyFile}"
-        ++ lib.optional (cfg.cachix.authTokenFile != null)
-          "cachix-auth-token:${builtins.toString cfg.cachix.authTokenFile}";
       };
     };