package.json

@@ -28,7 +28,7 @@
     "@actions/core": "^1.10.1",
     "@actions/exec": "^1.1.1",
     "@actions/github": "^5.1.1",
-    "detsys-ts": "github:DeterminateSystems/detsys-ts",
+    "detsys-ts": "github:DeterminateSystems/detsys-ts#ts-results",
     "string-argv": "^0.3.2"
   },
   "devDependencies": {

pnpm-lock.yaml

@@ -15,8 +15,8 @@ dependencies:
     specifier: ^5.1.1
     version: 5.1.1
   detsys-ts:
-    specifier: github:DeterminateSystems/detsys-ts
+    specifier: github:DeterminateSystems/detsys-ts#ts-results
-    version: github.com/DeterminateSystems/detsys-ts/cd38b227c4d6faca10aed591b1f8863ef7b93dce
+    version: github.com/DeterminateSystems/detsys-ts/abd5b78c8e24857812017ab2da0f962095811f10
   string-argv:
     specifier: ^0.3.2
     version: 0.3.2
@@ -5019,6 +5019,13 @@ packages:
       }
     dev: true
 
+  /ts-results@3.3.0:
+    resolution:
+      {
+        integrity: sha512-FWqxGX2NHp5oCyaMd96o2y2uMQmSu8Dey6kvyuFdRJ2AzfmWo3kWa4UsPlCGlfQ/qu03m09ZZtppMoY8EMHuiA==,
+      }
+    dev: false
+
   /tsconfig-paths@3.15.0:
     resolution:
       {
@@ -5440,10 +5447,10 @@ packages:
     engines: { node: ">=10" }
     dev: true
 
-  github.com/DeterminateSystems/detsys-ts/cd38b227c4d6faca10aed591b1f8863ef7b93dce:
+  github.com/DeterminateSystems/detsys-ts/abd5b78c8e24857812017ab2da0f962095811f10:
     resolution:
       {
-        tarball: https://codeload.github.com/DeterminateSystems/detsys-ts/tar.gz/cd38b227c4d6faca10aed591b1f8863ef7b93dce,
+        tarball: https://codeload.github.com/DeterminateSystems/detsys-ts/tar.gz/abd5b78c8e24857812017ab2da0f962095811f10,
       }
     name: detsys-ts
     version: 1.0.0
@@ -5452,6 +5459,7 @@ packages:
       "@actions/core": 1.10.1
       "@actions/exec": 1.1.1
       got: 14.2.1
+      ts-results: 3.3.0
     transitivePeerDependencies:
       - encoding
     dev: false

src/index.ts

@@ -7,7 +7,7 @@ import fs from "node:fs";
 import { userInfo } from "node:os";
 import stringArgv from "string-argv";
 import * as path from "path";
-import { IdsToolbox, inputs, platform } from "detsys-ts";
+import { IdsToolbox, inputs, platform, result } from "detsys-ts";
 import { randomUUID } from "node:crypto";
 
 // Nix installation events
@@ -73,9 +73,22 @@ class NixInstallerAction {
       fetchStyle: "nix-style",
       legacySourcePrefix: "nix-installer",
       requireNix: "ignore",
+      hookMain: async () => {
+        await this.detectAndForceDockerShim();
+        await this.install();
+        return result.SUCCESS;
+      },
+      hookPost: async () => {
+        await this.cleanupDockerShim();
+        await this.reportOverall();
+        return result.SUCCESS;
+      },
     });
 
-    this.platform = platform.getNixPlatform(platform.getArchOs());
+    const archOs = result.valueOrFail(platform.getArchOs());
+    const nixPlatform = result.valueOrFail(platform.getNixPlatform(archOs));
+
+    this.platform = nixPlatform;
     this.nixPackageUrl = inputs.getStringOrNull("nix-package-url");
     this.backtrace = inputs.getStringOrNull("backtrace");
     this.extraArgs = inputs.getStringOrNull("extra-args");
@@ -307,7 +320,9 @@ class NixInstallerAction {
     return foundDockerSockMount;
   }
 
-  private async executionEnvironment(): Promise<ExecuteEnvironment> {
+  private async executionEnvironment(): Promise<
+    result.Result<ExecuteEnvironment>
+  > {
     const executionEnv: ExecuteEnvironment = {};
     const runnerOs = process.env["RUNNER_OS"];
 
@@ -366,14 +381,14 @@ class NixInstallerAction {
     // TODO: Error if the user uses these on not-MacOS
     if (this.macEncrypt !== null) {
       if (runnerOs !== "macOS") {
-        throw new Error("`mac-encrypt` while `$RUNNER_OS` was not `macOS`");
+        return result.Err("`mac-encrypt` while `$RUNNER_OS` was not `macOS`");
       }
       executionEnv.NIX_INSTALLER_ENCRYPT = this.macEncrypt;
     }
 
     if (this.macCaseSensitive !== null) {
       if (runnerOs !== "macOS") {
-        throw new Error(
+        return result.Err(
           "`mac-case-sensitive` while `$RUNNER_OS` was not `macOS`",
         );
       }
@@ -382,7 +397,7 @@ class NixInstallerAction {
 
     if (this.macVolumeLabel !== null) {
       if (runnerOs !== "macOS") {
-        throw new Error(
+        return result.Err(
           "`mac-volume-label` while `$RUNNER_OS` was not `macOS`",
         );
       }
@@ -391,7 +406,7 @@ class NixInstallerAction {
 
     if (this.macRootDisk !== null) {
       if (runnerOs !== "macOS") {
-        throw new Error("`mac-root-disk` while `$RUNNER_OS` was not `macOS`");
+        return result.Err("`mac-root-disk` while `$RUNNER_OS` was not `macOS`");
       }
       executionEnv.NIX_INSTALLER_ROOT_DISK = this.macRootDisk;
     }
@@ -407,7 +422,7 @@ class NixInstallerAction {
     // TODO: Error if the user uses these on MacOS
     if (this.init !== null) {
       if (runnerOs === "macOS") {
-        throw new Error(
+        return result.Err(
           "`init` is not a valid option when `$RUNNER_OS` is `macOS`",
         );
       }
@@ -468,11 +483,13 @@ class NixInstallerAction {
       executionEnv.NIX_INSTALLER_INIT = "none";
     }
 
-    return executionEnv;
+    return result.Ok(executionEnv);
   }
 
-  private async executeInstall(binaryPath: string): Promise<number> {
+  private async executeInstall(
-    const executionEnv = await this.executionEnvironment();
+    binaryPath: string,
+  ): Promise<result.Result<number>> {
+    const executionEnv = result.valueOrFail(await this.executionEnvironment());
     actionsCore.debug(
       `Execution environment: ${JSON.stringify(executionEnv, null, 4)}`,
     );
@@ -482,8 +499,9 @@ class NixInstallerAction {
       this.idslib.addFact(FACT_NIX_INSTALLER_PLANNER, this.planner);
       args.push(this.planner);
     } else {
-      this.idslib.addFact(FACT_NIX_INSTALLER_PLANNER, getDefaultPlanner());
+      const defaultPlanner = result.valueOrFail(getDefaultPlanner());
-      args.push(getDefaultPlanner());
+      this.idslib.addFact(FACT_NIX_INSTALLER_PLANNER, defaultPlanner);
+      args.push(defaultPlanner);
     }
 
     if (this.extraArgs) {
@@ -503,12 +521,12 @@ class NixInstallerAction {
       this.idslib.recordEvent(EVENT_INSTALL_NIX_FAILURE, {
         exitCode,
       });
-      throw new Error(`Non-zero exit code of \`${exitCode}\` detected`);
+      return result.Err(`Non-zero exit code of \`${exitCode}\` detected`);
     }
 
     this.idslib.recordEvent(EVENT_INSTALL_NIX_SUCCESS);
 
-    return exitCode;
+    return result.Ok(exitCode);
   }
 
   async install(): Promise<void> {
@@ -553,7 +571,7 @@ class NixInstallerAction {
     await this.setGithubPath();
   }
 
-  async spawnDockerShim(): Promise<void> {
+  async spawnDockerShim(): Promise<result.Result<void>> {
     actionsCore.startGroup(
       "Configuring the Docker shim as the Nix Daemon's process supervisor",
     );
@@ -571,7 +589,7 @@ class NixInstallerAction {
     } else if (runnerArch === "ARM64") {
       arch = "ARM64";
     } else {
-      throw Error("Architecture not supported in Docker shim mode.");
+      return result.Err("Architecture not supported in Docker shim mode.");
     }
     actionsCore.debug("Loading image: determinate-nix-shim:latest...");
     {
@@ -598,7 +616,7 @@ class NixInstallerAction {
       );
 
       if (exitCode !== 0) {
-        throw new Error(
+        return result.Err(
           `Failed to build the shim image, exit code: \`${exitCode}\``,
         );
       }
@@ -659,7 +677,7 @@ class NixInstallerAction {
       );
 
       if (exitCode !== 0) {
-        throw new Error(
+        return result.Err(
           `Failed to start the Nix daemon through Docker, exit code: \`${exitCode}\``,
         );
       }
@@ -667,8 +685,9 @@ class NixInstallerAction {
 
     actionsCore.endGroup();
 
-    return;
+    return result.Ok(undefined);
   }
+
   async cleanupDockerShim(): Promise<void> {
     const containerId = actionsCore.getState("docker_shim_container_id");
 
@@ -751,7 +770,7 @@ class NixInstallerAction {
     return netrcPath;
   }
 
-  async executeUninstall(): Promise<number> {
+  async executeUninstall(): Promise<result.Result<number>> {
     this.idslib.recordEvent(EVENT_UNINSTALL_NIX);
     const exitCode = await actionsExec.exec(
       `/nix/nix-installer`,
@@ -765,10 +784,10 @@ class NixInstallerAction {
     );
 
     if (exitCode !== 0) {
-      throw new Error(`Non-zero exit code of \`${exitCode}\` detected`);
+      return result.Err(`Non-zero exit code of \`${exitCode}\` detected`);
     }
 
-    return exitCode;
+    return result.Ok(exitCode);
   }
 
   async detectExisting(): Promise<boolean> {
@@ -783,7 +802,7 @@ class NixInstallerAction {
     }
   }
 
-  private async setupKvm(): Promise<boolean> {
+  private async setupKvm(): Promise<result.Result<boolean>> {
     this.idslib.recordEvent(EVENT_SETUP_KVM);
     const currentUser = userInfo();
     const isRoot = currentUser.uid === 0;
@@ -817,7 +836,7 @@ class NixInstallerAction {
       );
 
       if (writeFileExitCode !== 0) {
-        throw new Error(
+        return result.Err(
           `Non-zero exit code of \`${writeFileExitCode}\` detected while writing '${kvmRules}'`,
         );
       }
@@ -826,7 +845,7 @@ class NixInstallerAction {
         action: string,
         command: string,
         args: string[],
-      ): Promise<void> => {
+      ): Promise<result.Result<void>> => {
         if (!isRoot) {
           args = [command, ...args];
           command = "sudo";
@@ -850,23 +869,29 @@ class NixInstallerAction {
         });
 
         if (reloadExitCode !== 0) {
-          throw new Error(
+          return result.Err(
             `Non-zero exit code of \`${reloadExitCode}\` detected while ${action}.`,
           );
         }
+
+        return result.Ok(undefined);
       };
 
-      await debugRootRunThrow("reloading udev rules", "udevadm", [
+      await result.failOnError(
+        debugRootRunThrow("reloading udev rules", "udevadm", [
           "control",
           "--reload-rules",
-      ]);
+        ]),
+      );
 
-      await debugRootRunThrow("triggering udev against kvm", "udevadm", [
+      await result.failOnError(
+        debugRootRunThrow("triggering udev against kvm", "udevadm", [
           "trigger",
           "--name-match=kvm",
-      ]);
+        ]),
+      );
 
-      return true;
+      return result.Ok(true);
     } catch {
       if (isRoot) {
         await actionsExec.exec("rm", ["-f", kvmRules]);
@@ -874,7 +899,7 @@ class NixInstallerAction {
         await actionsExec.exec("sudo", ["rm", "-f", kvmRules]);
       }
 
-      return false;
+      return result.Ok(false);
     }
   }
 
@@ -974,31 +999,20 @@ type ExecuteEnvironment = {
   NIX_INSTALLER_LOGGER?: string;
 };
 
-function getDefaultPlanner(): string {
+function getDefaultPlanner(): result.Result<string> {
   const envOs = process.env["RUNNER_OS"];
 
   if (envOs === "macOS") {
-    return "macos";
+    return result.Ok("macos");
   } else if (envOs === "Linux") {
-    return "linux";
+    return result.Ok("linux");
   } else {
-    throw new Error(`Unsupported \`RUNNER_OS\` (currently \`${envOs}\`)`);
+    return result.Err(`Unsupported \`RUNNER_OS\` (currently \`${envOs}\`)`);
   }
 }
 
 function main(): void {
   const installer = new NixInstallerAction();
-
-  installer.idslib.onMain(async () => {
-    await installer.detectAndForceDockerShim();
-    await installer.install();
-  });
-
-  installer.idslib.onPost(async () => {
-    await installer.cleanupDockerShim();
-    await installer.reportOverall();
-  });
-
   installer.idslib.execute();
 }