Use npm to install Supabase CLI

README.md

@@ -28,8 +28,10 @@ steps:
 ```
 
 If `version` is omitted, the action checks the repository root for `bun.lock`,
-`pnpm-lock.yaml`, or `package-lock.json` and uses the declared `supabase`
+`pnpm-lock.yaml`, or `package-lock.json` and installs the declared `supabase`
-version. If no supported lockfile is present, it falls back to `latest`.
+package version through npm. If the lockfile includes package integrity
+metadata, the action verifies it against the npm registry before installing. If
+no supported lockfile is present, it falls back to `latest`.
 
 A specific version of the `supabase` CLI can be installed:
 
@@ -47,7 +49,6 @@ steps:
   - uses: supabase/setup-cli@v2
     with:
       version: latest
-      github-token: ${{ github.token }}
   - run: supabase init
   - run: supabase db start
 ```
@@ -60,9 +61,9 @@ on Windows and macOS runners.
 The action supports the following inputs:
 
 | Name           | Type   | Description                                                      | Default                           | Required |
-| -------------- | ------ | -------------------------------------------------------------------------- | --------------------------------- | -------- |
+| -------------- | ------ | ---------------------------------------------------------------- | --------------------------------- | -------- |
 | `version`      | String | Supabase CLI version (or `latest`)                               | Root lockfile version or `latest` | false    |
-| `github-token` | String | GitHub token used to resolve `latest` without unauthenticated API limiting |                                   | false    |
+| `github-token` | String | Deprecated; no longer used now that installs resolve through npm |                                   | false    |
 
 ## Advanced Usage
 

action.yml

@@ -6,7 +6,7 @@ inputs:
     description: Version of Supabase CLI to install. If omitted, detect from the root lockfile and otherwise use latest.
     required: false
   github-token:
-    description: GitHub token used to resolve the latest Supabase CLI release without hitting unauthenticated API limits.
+    description: Deprecated. The action now installs through npm and does not use GitHub release API requests.
     required: false
 outputs:
   version:
@@ -112,5 +112,4 @@ runs:
       working-directory: ${{ github.action_path }}
       env:
         INPUT_VERSION: ${{ inputs.version }}
-        SUPABASE_CLI_GITHUB_TOKEN: ${{ inputs.github-token }}
       run: bun src/main.ts

bun.lock

@@ -6,7 +6,6 @@
       "name": "setup-cli",
       "dependencies": {
         "@actions/core": "^3.0.1",
-        "@actions/tool-cache": "^4.0.0",
       },
       "devDependencies": {
         "@tsconfig/bun": "^1.0.10",
@@ -27,8 +26,6 @@
 
     "@actions/io": ["@actions/io@3.0.2", "", {}, "sha512-nRBchcMM+QK1pdjO7/idu86rbJI5YHUKCvKs0KxnSYbVe3F51UfGxuZX4Qy/fWlp6l7gWFwIkrOzN+oUK03kfw=="],
 
-    "@actions/tool-cache": ["@actions/tool-cache@4.0.0", "", { "dependencies": { "@actions/core": "^3.0.0", "@actions/exec": "^3.0.0", "@actions/http-client": "^4.0.0", "@actions/io": "^3.0.0", "semver": "^7.7.3" } }, "sha512-L8P9HbXvpvqjZDveb/fdsa55IVC0trfPgQ4ZwGo6r5af6YDVdM9vMGPZ7rgY2fAT9gGj4PSYd6bYlg3p3jD78A=="],
-
     "@oxfmt/binding-android-arm-eabi": ["@oxfmt/binding-android-arm-eabi@0.49.0", "", { "os": "android", "cpu": "arm" }, "sha512-HbifJ84prIh9+55CTPAU35JdRQrwg47y16cGerCC+iejSKOuHXYo2WDql6l7cQlzrYVtc3f4UWY+dBj2lRmOeA=="],
 
     "@oxfmt/binding-android-arm64": ["@oxfmt/binding-android-arm64@0.49.0", "", { "os": "android", "cpu": "arm64" }, "sha512-Ef7SKJqAaH2d7E6eXZZa2OffIShbhFMxnGK0zd93p4qiyTJr75B0qf7lrPD+qQOwcf04BrjYJ0JUxq8d5+yZwg=="],
@@ -147,8 +144,6 @@
 
     "oxlint-tsgolint": ["oxlint-tsgolint@0.22.1", "", { "optionalDependencies": { "@oxlint-tsgolint/darwin-arm64": "0.22.1", "@oxlint-tsgolint/darwin-x64": "0.22.1", "@oxlint-tsgolint/linux-arm64": "0.22.1", "@oxlint-tsgolint/linux-x64": "0.22.1", "@oxlint-tsgolint/win32-arm64": "0.22.1", "@oxlint-tsgolint/win32-x64": "0.22.1" }, "bin": { "tsgolint": "bin/tsgolint.js" } }, "sha512-YUSGSLUnoolsu8gxISEDio3q1rtsCozwfOzASUn3DT2mR2EeQ93uEEnen7s+6LpF+lyTQFln1pQfqwBh/fsVEg=="],
 
-    "semver": ["semver@7.7.4", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA=="],
-
     "tinypool": ["tinypool@2.1.0", "", {}, "sha512-Pugqs6M0m7Lv1I7FtxN4aoyToKg1C4tu+/381vH35y8oENM/Ai7f7C4StcoK4/+BSw9ebcS8jRiVrORFKCALLw=="],
 
     "tunnel": ["tunnel@0.0.6", "", {}, "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg=="],
@@ -156,7 +151,5 @@
     "undici": ["undici@6.24.1", "", {}, "sha512-sC+b0tB1whOCzbtlx20fx3WgCXwkW627p4EA9uM+/tNNPkSS+eSEld6pAs9nDv7WbY1UUljBMYPtu9BCOrCWKA=="],
 
     "undici-types": ["undici-types@6.21.0", "", {}, "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ=="],
-
-    "@actions/tool-cache/@actions/core": ["@actions/core@3.0.0", "", { "dependencies": { "@actions/exec": "^3.0.0", "@actions/http-client": "^4.0.0" } }, "sha512-zYt6cz+ivnTmiT/ksRVriMBOiuoUpDCJJlZ5KPl2/FRdvwU3f7MPh9qftvbkXJThragzUZieit2nyHUyw53Seg=="],
   }
 }

package.json

@@ -24,8 +24,7 @@
     "typecheck": "bun x tsgo -p tsconfig.json --noEmit"
   },
   "dependencies": {
-    "@actions/core": "^3.0.1",
+    "@actions/core": "^3.0.1"
-    "@actions/tool-cache": "^4.0.0"
   },
   "devDependencies": {
     "@tsconfig/bun": "^1.0.10",

src/main.test.ts

@@ -1,30 +1,26 @@
-import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import os from "node:os";
 import path from "node:path";
 import process from "node:process";
-import { fileURLToPath } from "node:url";
 import { afterEach, expect, mock, spyOn, test } from "bun:test";
 import * as core from "@actions/core";
-import * as tc from "@actions/tool-cache";
 
-const repo = path.dirname(path.dirname(fileURLToPath(import.meta.url)));
-const defaultEntrypoint = fileURLToPath(new URL("./main.ts", import.meta.url));
 const CLI_CONFIG_REGISTRY = "SUPABASE_INTERNAL_IMAGE_REGISTRY";
-const GITHUB_RELEASES_API = "https://api.github.com/repos/supabase/cli/releases/latest";
+const originalPath = process.env.PATH;
-const GITHUB_TOKEN_ENV = "SUPABASE_CLI_GITHUB_TOKEN";
+const originalRunnerTemp = process.env.RUNNER_TEMP;
 const originalWorkspace = process.env.GITHUB_WORKSPACE;
-const originalGithubToken = process.env[GITHUB_TOKEN_ENV];
 const tempDirs = new Set<string>();
 let mainModule: typeof import("./main.ts") | null = null;
 
 afterEach(() => {
   mock.restore();
+  process.env.PATH = originalPath;
+  process.env.RUNNER_TEMP = originalRunnerTemp;
   process.env.GITHUB_WORKSPACE = originalWorkspace;
-  if (originalGithubToken === undefined) {
+  delete process.env.FAKE_CLI_VERSION;
-    delete process.env[GITHUB_TOKEN_ENV];
+  delete process.env.FAKE_NPM_INTEGRITY;
-  } else {
+  delete process.env.FAKE_NPM_LOG;
-    process.env[GITHUB_TOKEN_ENV] = originalGithubToken;
+  delete process.env.SUPABASE_SETUP_CLI_NPM;
-  }
 
   for (const dir of tempDirs) {
     rmSync(dir, { force: true, recursive: true });
@@ -32,32 +28,14 @@ afterEach(() => {
   tempDirs.clear();
 });
 
-function createFakeCli(versionOutput: string): string {
+function createTempDir(prefix: string): string {
-  const dir = mkdtempSync(path.join(os.tmpdir(), "setup-cli-"));
+  const dir = mkdtempSync(path.join(os.tmpdir(), prefix));
   tempDirs.add(dir);
-
-  if (process.platform === "win32") {
-    writeFileSync(
-      path.join(dir, "supabase.cmd"),
-      versionOutput ? `@echo off\r\necho ${versionOutput}\r\n` : "@echo off\r\n",
-    );
-    return dir;
-  }
-
-  const escapedOutput = versionOutput.replaceAll("'", "'\"'\"'");
-  writeFileSync(
-    path.join(dir, "supabase"),
-    versionOutput
-      ? `#!/usr/bin/env bash\nprintf '%s\\n' '${escapedOutput}'\n`
-      : "#!/usr/bin/env bash\n",
-  );
-  Bun.spawnSync(["chmod", "+x", path.join(dir, "supabase")]);
   return dir;
 }
 
 function createWorkspace(files: Record<string, string>): string {
-  const dir = mkdtempSync(path.join(os.tmpdir(), "setup-cli-workspace-"));
+  const dir = createTempDir("setup-cli-workspace-");
-  tempDirs.add(dir);
 
   for (const [relativePath, content] of Object.entries(files)) {
     const filePath = path.join(dir, relativePath);
@@ -73,6 +51,7 @@ function createBunLock(
   options: {
     includeDependency?: boolean;
     includePackageEntry?: boolean;
+    integrity?: string;
     useDevDependency?: boolean;
   } = {},
 ): string {
@@ -98,7 +77,7 @@ ${
       "supabase@${version}",
       "",
       {},
-      "sha512-test"
+      "${options.integrity ?? "sha512-bun"}"
     ]`
     : ""
 }
@@ -109,7 +88,12 @@ ${
 
 function createPnpmLock(
   version: string,
-  options: { asString?: boolean; includeVersion?: boolean; useDevDependency?: boolean } = {},
+  options: {
+    asString?: boolean;
+    includeVersion?: boolean;
+    integrity?: string;
+    useDevDependency?: boolean;
+  } = {},
 ): string {
   const dependencyKey = options.useDevDependency ? "devDependencies" : "dependencies";
 
@@ -127,11 +111,11 @@ ${options.includeVersion === false ? "" : `        version: ${version}`}`
 packages:
   supabase@${version}:
     resolution:
-      integrity: sha512-test
+      integrity: ${options.integrity ?? "sha512-pnpm"}
 `;
 }
 
-function createPackageLock(version: string): string {
+function createPackageLock(version: string, integrity = "sha512-package-lock"): string {
   return JSON.stringify(
     {
       name: "app",
@@ -143,6 +127,7 @@ function createPackageLock(version: string): string {
           },
         },
         "node_modules/supabase": {
+          integrity,
           version,
         },
       },
@@ -152,29 +137,105 @@ function createPackageLock(version: string): string {
   );
 }
 
-function createActionSpies(inputVersion: string, cliDir: string, expectedUrlFragment: string) {
+function createFakeNpm(): string {
-  return {
+  const root = createTempDir("setup-cli-fake-npm-");
-    getInput: spyOn(core, "getInput").mockReturnValue(inputVersion),
+  const binDir = path.join(root, "bin");
-    setOutput: spyOn(core, "setOutput").mockImplementation(() => {}),
+  const scriptPath = path.join(root, "fake-npm.js");
-    addPath: spyOn(core, "addPath").mockImplementation(() => {}),
+  mkdirSync(binDir, { recursive: true });
-    exportVariable: spyOn(core, "exportVariable").mockImplementation(() => {}),
+  writeFileSync(
-    setFailed: spyOn(core, "setFailed").mockImplementation(() => {}),
+    scriptPath,
-    downloadTool: spyOn(tc, "downloadTool").mockImplementation(async (url: string) => {
+    `import { appendFileSync, mkdirSync, writeFileSync } from "node:fs";
-      expect(url).toContain(expectedUrlFragment);
+import path from "node:path";
-      return path.join(os.tmpdir(), "supabase-cli.tar.gz");
+
-    }),
+const args = process.argv.slice(2);
-    extractTar: spyOn(tc, "extractTar").mockImplementation(async () => cliDir),
+appendFileSync(process.env.FAKE_NPM_LOG, JSON.stringify(args) + "\\n");
-    extractZip: spyOn(tc, "extractZip").mockImplementation(async () => cliDir),
+
-  };
+if (args[0] === "view") {
+  console.log(JSON.stringify(process.env.FAKE_NPM_INTEGRITY ?? "sha512-test"));
+  process.exit(0);
 }
 
-function mockLatestRelease(version = "v2.99.0") {
+if (args[0] !== "install") {
-  return spyOn(globalThis, "fetch").mockResolvedValue(
+  console.error("Unexpected npm command: " + args.join(" "));
-    new Response(JSON.stringify({ tag_name: version }), {
+  process.exit(1);
-      status: 200,
+}
-      statusText: "OK",
+
-    }),
+const prefixIndex = args.indexOf("--prefix");
+const prefix = prefixIndex === -1 ? undefined : args[prefixIndex + 1];
+if (!prefix) {
+  console.error("Missing --prefix");
+  process.exit(1);
+}
+
+const binDir = path.join(prefix, "node_modules", ".bin");
+mkdirSync(binDir, { recursive: true });
+
+if (process.platform === "win32") {
+  writeFileSync(
+    path.join(binDir, "supabase.cmd"),
+    process.env.FAKE_CLI_VERSION ? "@echo off\\r\\necho " + process.env.FAKE_CLI_VERSION + "\\r\\n" : "@echo off\\r\\n",
   );
+} else {
+  writeFileSync(
+    path.join(binDir, "supabase"),
+    process.env.FAKE_CLI_VERSION
+      ? "#!/usr/bin/env bash\\nprintf '%s\\\\n' '" + process.env.FAKE_CLI_VERSION.replaceAll("'", "'\\\\''") + "'\\n"
+      : "#!/usr/bin/env bash\\n",
+    { mode: 0o755 },
+  );
+}
+`,
+  );
+
+  if (process.platform === "win32") {
+    writeFileSync(
+      path.join(binDir, "npm.cmd"),
+      `@echo off\r\n"${process.execPath}" "${scriptPath}" %*\r\n`,
+    );
+  } else {
+    writeFileSync(
+      path.join(binDir, "npm"),
+      `#!/usr/bin/env bash\nexec "${process.execPath}" "${scriptPath}" "$@"\n`,
+      { mode: 0o755 },
+    );
+  }
+
+  return binDir;
+}
+
+function installFakeNpm(versionOutput = "supabase 2.101.0", integrity = "sha512-test"): string {
+  const binDir = createFakeNpm();
+  const logPath = path.join(createTempDir("setup-cli-fake-npm-log-"), "npm.log");
+  writeFileSync(logPath, "");
+  process.env.FAKE_CLI_VERSION = versionOutput;
+  process.env.FAKE_NPM_INTEGRITY = integrity;
+  process.env.FAKE_NPM_LOG = logPath;
+  process.env.PATH = `${binDir}${path.delimiter}${originalPath ?? ""}`;
+  process.env.RUNNER_TEMP = createTempDir("setup-cli-runner-temp-");
+  process.env.SUPABASE_SETUP_CLI_NPM = path.join(
+    binDir,
+    process.platform === "win32" ? "npm.cmd" : "npm",
+  );
+
+  return logPath;
+}
+
+function readNpmCalls(logPath: string): string[][] {
+  return readFileSync(logPath, "utf8")
+    .trim()
+    .split("\n")
+    .filter(Boolean)
+    .map((line) => JSON.parse(line) as string[]);
+}
+
+function createActionSpies(inputVersion: string) {
+  return {
+    addPath: spyOn(core, "addPath").mockImplementation(() => {}),
+    exportVariable: spyOn(core, "exportVariable").mockImplementation(() => {}),
+    getInput: spyOn(core, "getInput").mockReturnValue(inputVersion),
+    setFailed: spyOn(core, "setFailed").mockImplementation(() => {}),
+    setOutput: spyOn(core, "setOutput").mockImplementation(() => {}),
+  };
 }
 
 async function getMainModule(): Promise<typeof import("./main.ts")> {
@@ -185,193 +246,52 @@ async function getMainModule(): Promise<typeof import("./main.ts")> {
   return mainModule;
 }
 
-test("uses versioned tar archives for Supabase CLI v2.99.0 and later", async () => {
+test("uses an explicit npm package version when provided", async () => {
-  const { getDownloadArchive } = await getMainModule();
+  const { resolvePackage } = await getMainModule();
 
-  const archive = await getDownloadArchive("2.99.0", "linux", "x64");
+  expect(resolvePackage("v2.101.0")).toEqual({
-
+    spec: "supabase@2.101.0",
-  expect(archive).toEqual({
+    version: "2.101.0",
-    url: "https://github.com/supabase/cli/releases/download/v2.99.0/supabase_2.99.0_linux_amd64.tar.gz",
-    format: "tar",
   });
 });
 
-test("uses apk archives for Supabase CLI v2.99.0 and later on Linux musl", async () => {
+test("uses the root bun.lock resolution when version is omitted", async () => {
-  const { getDownloadArchive } = await getMainModule();
-
-  const archive = await getDownloadArchive("2.100.1", "linux", "x64", true);
-
-  expect(archive).toEqual({
-    url: "https://github.com/supabase/cli/releases/download/v2.100.1/supabase_2.100.1_linux_amd64.apk",
-    format: "apk",
-  });
-});
-
-test("keeps tar archives before Supabase CLI v2.99.0 on Linux musl", async () => {
-  const { getDownloadArchive } = await getMainModule();
-
-  const archive = await getDownloadArchive("2.98.2", "linux", "x64", true);
-
-  expect(archive).toEqual({
-    url: "https://github.com/supabase/cli/releases/download/v2.98.2/supabase_linux_amd64.tar.gz",
-    format: "tar",
-  });
-});
-
-test("uses usr/bin as the CLI path for apk archives", async () => {
-  const { getCliPath } = await getMainModule();
-
-  expect(getCliPath("/tmp/extracted", "apk")).toBe(path.join("/tmp/extracted", "usr", "bin"));
-  expect(getCliPath("/tmp/extracted", "tar")).toBe("/tmp/extracted");
-  expect(getCliPath("/tmp/extracted", "zip")).toBe("/tmp/extracted");
-});
-
-test("keeps the unversioned tar archive layout before Supabase CLI v2.99.0", async () => {
-  const { getDownloadArchive } = await getMainModule();
-
-  const archive = await getDownloadArchive("2.98.2", "linux", "x64");
-
-  expect(archive).toEqual({
-    url: "https://github.com/supabase/cli/releases/download/v2.98.2/supabase_linux_amd64.tar.gz",
-    format: "tar",
-  });
-});
-
-test("uses versioned zip archives for Windows Supabase CLI v2.99.0 and later", async () => {
-  const { getDownloadArchive } = await getMainModule();
-
-  const archive = await getDownloadArchive("2.99.0", "win32", "x64");
-
-  expect(archive).toEqual({
-    url: "https://github.com/supabase/cli/releases/download/v2.99.0/supabase_2.99.0_windows_amd64.zip",
-    format: "zip",
-  });
-});
-
-test("resolves latest before choosing a versioned Supabase CLI archive", async () => {
-  mockLatestRelease("v2.99.0");
-  const { getDownloadArchive } = await getMainModule();
-
-  const archive = await getDownloadArchive("latest", "darwin", "arm64");
-
-  expect(archive).toEqual({
-    url: "https://github.com/supabase/cli/releases/download/v2.99.0/supabase_2.99.0_darwin_arm64.tar.gz",
-    format: "tar",
-  });
-});
-
-test("authenticates latest release lookup when a GitHub token is provided", async () => {
-  process.env[GITHUB_TOKEN_ENV] = "ghs_test-token";
-  const fetch = mockLatestRelease("v2.99.0");
-  const { getDownloadArchive } = await getMainModule();
-
-  await getDownloadArchive("latest", "darwin", "arm64");
-
-  expect(fetch).toHaveBeenCalledWith(GITHUB_RELEASES_API, {
-    headers: expect.objectContaining({
-      Accept: "application/vnd.github+json",
-      Authorization: "Bearer ghs_test-token",
-      "X-GitHub-Api-Version": "2022-11-28",
-    }),
-  });
-});
-
-test("awaits the action entrypoint with omitted version and latest fallback", async () => {
-  process.env.GITHUB_WORKSPACE = repo;
-  mockLatestRelease();
-  const cliDir = createFakeCli("supabase 2.84.2");
-  let startDownload!: () => void;
-  let finishDownload!: () => void;
-  const downloadStarted = new Promise<void>((resolve) => {
-    startDownload = resolve;
-  });
-  const downloadFinished = new Promise<string>((resolve) => {
-    finishDownload = () => resolve(path.join(os.tmpdir(), "supabase-cli.tar.gz"));
-  });
-  const spies = {
-    getInput: spyOn(core, "getInput").mockReturnValue(""),
-    setOutput: spyOn(core, "setOutput").mockImplementation(() => {}),
-    addPath: spyOn(core, "addPath").mockImplementation(() => {}),
-    exportVariable: spyOn(core, "exportVariable").mockImplementation(() => {}),
-    setFailed: spyOn(core, "setFailed").mockImplementation(() => {}),
-    downloadTool: spyOn(tc, "downloadTool").mockImplementation(async (url: string) => {
-      expect(url).toContain("/download/v2.99.0/supabase_2.99.0_");
-      startDownload();
-      return downloadFinished;
-    }),
-    extractTar: spyOn(tc, "extractTar").mockImplementation(async () => cliDir),
-    extractZip: spyOn(tc, "extractZip").mockImplementation(async () => cliDir),
-  };
-  const originalArgv1 = process.argv[1];
-  process.argv[1] = defaultEntrypoint;
-
-  try {
-    let importSettled = false;
-    const entrypoint = import(`./main.ts?entrypoint=${Date.now()}`).finally(() => {
-      importSettled = true;
-    });
-
-    await downloadStarted;
-    await Bun.sleep(0);
-
-    expect(importSettled).toBe(false);
-
-    finishDownload();
-    await entrypoint;
-  } finally {
-    process.argv[1] = originalArgv1 ?? "";
-  }
-
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.84.2");
-  expect(spies.addPath).toHaveBeenCalledWith(cliDir);
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
-  expect(spies.setFailed).not.toHaveBeenCalled();
-});
-
-test("uses the root bun.lock version when version is omitted", async () => {
   process.env.GITHUB_WORKSPACE = createWorkspace({
-    "bun.lock": createBunLock("2.41.0"),
+    "bun.lock": createBunLock("2.41.0", { integrity: "sha512-bun-lock" }),
   });
-  const cliDir = createFakeCli("supabase 2.41.0");
+  const { resolvePackage } = await getMainModule();
-  const spies = createActionSpies("", cliDir, "/download/v2.41.0/supabase_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    integrity: "sha512-bun-lock",
-  expect(spies.downloadTool).not.toHaveBeenCalledWith(expect.stringContaining("/latest/download/"));
+    spec: "supabase@2.41.0",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.41.0");
+    version: "2.41.0",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+  });
-  expect(spies.setFailed).not.toHaveBeenCalled();
 });
 
-test("uses the root pnpm-lock.yaml version when version is omitted", async () => {
+test("uses the root pnpm-lock.yaml resolution when version is omitted", async () => {
   process.env.GITHUB_WORKSPACE = createWorkspace({
-    "pnpm-lock.yaml": createPnpmLock("2.42.0"),
+    "pnpm-lock.yaml": createPnpmLock("2.42.0", { integrity: "sha512-pnpm-lock" }),
   });
-  const cliDir = createFakeCli("supabase 2.42.0");
+  const { resolvePackage } = await getMainModule();
-  const spies = createActionSpies("", cliDir, "/download/v2.42.0/supabase_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    integrity: "sha512-pnpm-lock",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.42.0");
+    spec: "supabase@2.42.0",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+    version: "2.42.0",
-  expect(spies.setFailed).not.toHaveBeenCalled();
+  });
 });
 
-test("uses the root package-lock.json version when version is omitted", async () => {
+test("uses the root package-lock.json resolution when version is omitted", async () => {
   process.env.GITHUB_WORKSPACE = createWorkspace({
-    "package-lock.json": createPackageLock("2.43.0"),
+    "package-lock.json": createPackageLock("2.43.0", "sha512-package-lock"),
   });
-  const cliDir = createFakeCli("supabase 2.43.0");
+  const { resolvePackage } = await getMainModule();
-  const spies = createActionSpies("", cliDir, "/download/v2.43.0/supabase_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    integrity: "sha512-package-lock",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.43.0");
+    spec: "supabase@2.43.0",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+    version: "2.43.0",
-  expect(spies.setFailed).not.toHaveBeenCalled();
+  });
 });
 
 test("falls through malformed lockfiles and uses the next supported root lockfile", async () => {
@@ -379,60 +299,47 @@ test("falls through malformed lockfiles and uses the next supported root lockfil
     "bun.lock": "{ not valid",
     "package-lock.json": createPackageLock("2.44.0"),
   });
-  const cliDir = createFakeCli("supabase 2.44.0");
+  const { resolvePackage } = await getMainModule();
-  const spies = createActionSpies("", cliDir, "/download/v2.44.0/supabase_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    integrity: "sha512-package-lock",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.44.0");
+    spec: "supabase@2.44.0",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+    version: "2.44.0",
-  expect(spies.setFailed).not.toHaveBeenCalled();
+  });
 });
 
 test("falls back to latest when version is omitted and no supported root lockfile is present", async () => {
   process.env.GITHUB_WORKSPACE = createWorkspace({
     "README.md": "# app\n",
   });
-  mockLatestRelease();
+  const { resolvePackage } = await getMainModule();
-  const cliDir = createFakeCli("supabase 2.84.2");
-  const spies = createActionSpies("", cliDir, "/download/v2.99.0/supabase_2.99.0_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    spec: "supabase@latest",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.84.2");
+    version: "latest",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+  });
-  expect(spies.setFailed).not.toHaveBeenCalled();
 });
 
 test("falls back to latest when version is omitted and no workspace is available", async () => {
   delete process.env.GITHUB_WORKSPACE;
-  mockLatestRelease();
+  const { resolvePackage } = await getMainModule();
-  const cliDir = createFakeCli("supabase 2.84.2");
-  const spies = createActionSpies("", cliDir, "/download/v2.99.0/supabase_2.99.0_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    spec: "supabase@latest",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.84.2");
+    version: "latest",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+  });
-  expect(spies.setFailed).not.toHaveBeenCalled();
 });
 
 test("uses the declared bun.lock version when the resolved package entry is missing", async () => {
   process.env.GITHUB_WORKSPACE = createWorkspace({
     "bun.lock": createBunLock("2.44.1", { includePackageEntry: false, useDevDependency: true }),
   });
-  const cliDir = createFakeCli("supabase 2.44.1");
+  const { resolvePackage } = await getMainModule();
-  const spies = createActionSpies("", cliDir, "/download/v2.44.1/supabase_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    spec: "supabase@2.44.1",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.44.1");
+    version: "2.44.1",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+  });
-  expect(spies.setFailed).not.toHaveBeenCalled();
 });
 
 test("falls through bun.lock without supabase and uses a pnpm string dependency version", async () => {
@@ -440,73 +347,119 @@ test("falls through bun.lock without supabase and uses a pnpm string dependency
     "bun.lock": createBunLock("2.47.0", { includeDependency: false }),
     "pnpm-lock.yaml": createPnpmLock("2.47.0", { asString: true }),
   });
-  const cliDir = createFakeCli("supabase 2.47.0");
+  const { resolvePackage } = await getMainModule();
-  const spies = createActionSpies("", cliDir, "/download/v2.47.0/supabase_");
-  const { run } = await getMainModule();
 
-  await run();
+  expect(resolvePackage("")).toEqual({
-
+    integrity: "sha512-pnpm",
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.47.0");
+    spec: "supabase@2.47.0",
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
+    version: "2.47.0",
-  expect(spies.setFailed).not.toHaveBeenCalled();
-});
-
-test("falls through malformed pnpm lockfiles and uses the next supported root lockfile", async () => {
-  process.env.GITHUB_WORKSPACE = createWorkspace({
-    "pnpm-lock.yaml": "not: [valid",
-    "package-lock.json": createPackageLock("2.48.0"),
   });
-  const cliDir = createFakeCli("supabase 2.48.0");
-  const spies = createActionSpies("", cliDir, "/download/v2.48.0/supabase_");
-  const { run } = await getMainModule();
-
-  await run();
-
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.48.0");
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
-  expect(spies.setFailed).not.toHaveBeenCalled();
-});
-
-test("falls through unreadable bun.lock paths and malformed package-lock files to latest", async () => {
-  const workspace = createWorkspace({
-    "package-lock.json": "{ invalid",
-  });
-  mkdirSync(path.join(workspace, "bun.lock"), { recursive: true });
-  process.env.GITHUB_WORKSPACE = workspace;
-  mockLatestRelease();
-  const cliDir = createFakeCli("supabase 2.84.2");
-  const spies = createActionSpies("", cliDir, "/download/v2.99.0/supabase_2.99.0_");
-  const { run } = await getMainModule();
-
-  await run();
-
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.84.2");
-  expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
-  expect(spies.setFailed).not.toHaveBeenCalled();
 });
 
 test("falls back to latest when a pnpm dependency entry has no concrete version", async () => {
   process.env.GITHUB_WORKSPACE = createWorkspace({
     "pnpm-lock.yaml": createPnpmLock("2.49.0", { includeVersion: false }),
   });
-  mockLatestRelease();
+  const { resolvePackage } = await getMainModule();
-  const cliDir = createFakeCli("supabase 2.84.2");
+
-  const spies = createActionSpies("", cliDir, "/download/v2.99.0/supabase_2.99.0_");
+  expect(resolvePackage("")).toEqual({
+    spec: "supabase@latest",
+    version: "latest",
+  });
+});
+
+test("installs the CLI with npm into an isolated prefix", async () => {
+  const logPath = installFakeNpm();
+  const { installCli } = await getMainModule();
+
+  const cliPath = await installCli({
+    spec: "supabase@2.101.0",
+    version: "2.101.0",
+  });
+
+  expect(cliPath).toContain(`${path.sep}node_modules${path.sep}.bin`);
+  expect(readNpmCalls(logPath)).toEqual([
+    [
+      "install",
+      "--prefix",
+      expect.any(String),
+      "--omit=dev",
+      "--no-audit",
+      "--no-fund",
+      "--no-package-lock",
+      "--ignore-scripts",
+      "supabase@2.101.0",
+    ],
+  ]);
+});
+
+test("verifies lockfile integrity before installing", async () => {
+  const logPath = installFakeNpm("supabase 2.101.0", "sha512-lock");
+  const { installCli } = await getMainModule();
+
+  await installCli({
+    integrity: "sha512-lock",
+    spec: "supabase@2.101.0",
+    version: "2.101.0",
+  });
+
+  expect(readNpmCalls(logPath)).toEqual([
+    ["view", "supabase@2.101.0", "dist.integrity", "--json"],
+    [
+      "install",
+      "--prefix",
+      expect.any(String),
+      "--omit=dev",
+      "--no-audit",
+      "--no-fund",
+      "--no-package-lock",
+      "--ignore-scripts",
+      "supabase@2.101.0",
+    ],
+  ]);
+});
+
+test("fails when lockfile integrity does not match the registry", async () => {
+  installFakeNpm("supabase 2.101.0", "sha512-registry");
+  const { installCli } = await getMainModule();
+
+  try {
+    await installCli({
+      integrity: "sha512-lock",
+      spec: "supabase@2.101.0",
+      version: "2.101.0",
+    });
+    throw new Error("Expected installCli to reject");
+  } catch (error) {
+    expect(error).toEqual(
+      new Error("Lockfile integrity for supabase@2.101.0 does not match the npm registry"),
+    );
+  }
+});
+
+test("runs the action with a package-lock resolution", async () => {
+  const logPath = installFakeNpm("supabase 2.43.0", "sha512-package-lock");
+  process.env.GITHUB_WORKSPACE = createWorkspace({
+    "package-lock.json": createPackageLock("2.43.0", "sha512-package-lock"),
+  });
+  const spies = createActionSpies("");
   const { run } = await getMainModule();
 
   await run();
 
-  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.84.2");
+  expect(readNpmCalls(logPath)[0]).toEqual(["view", "supabase@2.43.0", "dist.integrity", "--json"]);
+  expect(spies.setOutput).toHaveBeenCalledWith("version", "supabase 2.43.0");
+  expect(spies.addPath).toHaveBeenCalledWith(expect.stringContaining("node_modules"));
   expect(spies.exportVariable).toHaveBeenCalledWith(CLI_CONFIG_REGISTRY, "ghcr.io");
   expect(spies.setFailed).not.toHaveBeenCalled();
 });
 
 test("explicit version overrides detected root lockfiles", async () => {
+  installFakeNpm("supabase 1.0.0");
   process.env.GITHUB_WORKSPACE = createWorkspace({
     "bun.lock": createBunLock("2.45.0"),
   });
-  const cliDir = createFakeCli("supabase 1.0.0");
+  const spies = createActionSpies("1.0.0");
-  const spies = createActionSpies("1.0.0", cliDir, "/download/v1.0.0/supabase_1.0.0_");
   const { run } = await getMainModule();
 
   await run();
@@ -517,11 +470,11 @@ test("explicit version overrides detected root lockfiles", async () => {
 });
 
 test("fails when the installed CLI does not report a version", async () => {
+  installFakeNpm("");
   process.env.GITHUB_WORKSPACE = createWorkspace({
-    "package-lock.json": createPackageLock("2.46.0"),
+    "package-lock.json": createPackageLock("2.46.0", "sha512-test"),
   });
-  const cliDir = createFakeCli("");
+  const spies = createActionSpies("");
-  const spies = createActionSpies("", cliDir, "/download/v2.46.0/supabase_");
   const { run } = await getMainModule();
 
   await run();

src/main.ts

@@ -1,22 +1,20 @@
-import { $, semver } from "bun";
+import { semver } from "bun";
 import * as core from "@actions/core";
-import * as tc from "@actions/tool-cache";
+import { existsSync, mkdtempSync, readFileSync } from "node:fs";
-import { existsSync, readFileSync } from "node:fs";
+import os from "node:os";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 
 export const CLI_CONFIG_REGISTRY = "SUPABASE_INTERNAL_IMAGE_REGISTRY";
 const REGISTRY_VERSION = "1.28.0";
-const VERSIONED_ARCHIVE_VERSION = "2.99.0";
 const DEFAULT_VERSION = "latest";
-const GITHUB_RELEASES_API = "https://api.github.com/repos/supabase/cli/releases/latest";
+const NPM_PACKAGE = "supabase";
-const GITHUB_TOKEN_ENV = "SUPABASE_CLI_GITHUB_TOKEN";
+const NPM_EXECUTABLE_ENV = "SUPABASE_SETUP_CLI_NPM";
 
-type ArchiveFormat = "apk" | "tar" | "zip";
+type PackageResolution = {
-
+  spec: string;
-type DownloadArchive = {
+  version: string;
-  url: string;
+  integrity?: string;
-  format: ArchiveFormat;
 };
 
 type BunLock = {
@@ -35,6 +33,12 @@ type PnpmDependency =
       version?: string;
     };
 
+type PnpmPackage = {
+  resolution?: {
+    integrity?: string;
+  };
+};
+
 type PnpmLock = {
   importers?: {
     ".": {
@@ -42,21 +46,14 @@ type PnpmLock = {
       devDependencies?: Record<string, PnpmDependency>;
     };
   };
+  packages?: Record<string, PnpmPackage>;
 };
 
 type PackageLock = {
-  packages?: Record<string, { version?: string }>;
+  packages?: Record<string, { integrity?: string; version?: string }>;
-  dependencies?: Record<string, { version?: string }>;
+  dependencies?: Record<string, { integrity?: string; version?: string }>;
 };
 
-function getArchivePlatform(platform: NodeJS.Platform): string {
-  return platform === "win32" ? "windows" : platform;
-}
-
-function getArchiveArch(arch: NodeJS.Architecture): string {
-  return arch === "x64" ? "amd64" : arch;
-}
-
 function extractConcreteVersion(raw: string | undefined): string | null {
   if (!raw) {
     return null;
@@ -70,6 +67,16 @@ function normalizeVersion(version: string): string {
   return version.replace(/^v/i, "");
 }
 
+function toPackageResolution(version: string, integrity?: string): PackageResolution {
+  const normalizedVersion = normalizeVersion(version);
+
+  return {
+    spec: `${NPM_PACKAGE}@${normalizedVersion}`,
+    version: normalizedVersion,
+    integrity,
+  };
+}
+
 function readWorkspaceLockfile(workspaceRoot: string, filename: string): string | null {
   const filePath = path.join(workspaceRoot, filename);
 
@@ -84,7 +91,7 @@ function readWorkspaceLockfile(workspaceRoot: string, filename: string): string
   }
 }
 
-function detectVersionFromBunLock(workspaceRoot: string): string | null {
+function detectResolutionFromBunLock(workspaceRoot: string): PackageResolution | null {
   const text = readWorkspaceLockfile(workspaceRoot, "bun.lock");
 
   if (!text) {
@@ -95,24 +102,28 @@ function detectVersionFromBunLock(workspaceRoot: string): string | null {
     const lockfile = JSON.parse(text.replace(/,\s*([}\]])/g, "$1")) as BunLock;
     const rootWorkspace = lockfile.workspaces?.[""];
     const declaredVersion =
-      rootWorkspace?.dependencies?.supabase ?? rootWorkspace?.devDependencies?.supabase;
+      rootWorkspace?.dependencies?.[NPM_PACKAGE] ?? rootWorkspace?.devDependencies?.[NPM_PACKAGE];
 
     if (!declaredVersion) {
       return null;
     }
 
-    const resolvedPackage = lockfile.packages?.supabase;
+    const resolvedPackage = lockfile.packages?.[NPM_PACKAGE];
     if (Array.isArray(resolvedPackage) && typeof resolvedPackage[0] === "string") {
-      return extractConcreteVersion(resolvedPackage[0]);
+      const version = extractConcreteVersion(resolvedPackage[0]);
+      const integrity = typeof resolvedPackage[3] === "string" ? resolvedPackage[3] : undefined;
+
+      return version ? toPackageResolution(version, integrity) : null;
     }
 
-    return extractConcreteVersion(declaredVersion);
+    const version = extractConcreteVersion(declaredVersion);
+    return version ? toPackageResolution(version) : null;
   } catch {
     return null;
   }
 }
 
-function detectVersionFromPnpmLock(workspaceRoot: string): string | null {
+function detectResolutionFromPnpmLock(workspaceRoot: string): PackageResolution | null {
   const text = readWorkspaceLockfile(workspaceRoot, "pnpm-lock.yaml");
 
   if (!text) {
@@ -123,19 +134,29 @@ function detectVersionFromPnpmLock(workspaceRoot: string): string | null {
     const lockfile = Bun.YAML.parse(text) as PnpmLock;
     const rootImporter = lockfile.importers?.["."];
     const dependency =
-      rootImporter?.dependencies?.supabase ?? rootImporter?.devDependencies?.supabase;
+      rootImporter?.dependencies?.[NPM_PACKAGE] ?? rootImporter?.devDependencies?.[NPM_PACKAGE];
+    const version =
+      typeof dependency === "string"
+        ? extractConcreteVersion(dependency)
+        : extractConcreteVersion(dependency?.version);
 
-    if (typeof dependency === "string") {
+    if (!version) {
-      return extractConcreteVersion(dependency);
+      return null;
     }
 
-    return extractConcreteVersion(dependency?.version);
+    const integrity = Object.entries(lockfile.packages ?? {}).find(
+      ([packageKey]) =>
+        packageKey === `${NPM_PACKAGE}@${version}` ||
+        packageKey.startsWith(`/${NPM_PACKAGE}@${version}`),
+    )?.[1].resolution?.integrity;
+
+    return toPackageResolution(version, integrity);
   } catch {
     return null;
   }
 }
 
-function detectVersionFromPackageLock(workspaceRoot: string): string | null {
+function detectResolutionFromPackageLock(workspaceRoot: string): PackageResolution | null {
   const text = readWorkspaceLockfile(workspaceRoot, "package-lock.json");
 
   if (!text) {
@@ -144,147 +165,97 @@ function detectVersionFromPackageLock(workspaceRoot: string): string | null {
 
   try {
     const lockfile = JSON.parse(text) as PackageLock;
+    const packageEntry = lockfile.packages?.[`node_modules/${NPM_PACKAGE}`];
+    const dependencyEntry = lockfile.dependencies?.[NPM_PACKAGE];
+    const version =
+      extractConcreteVersion(packageEntry?.version) ??
+      extractConcreteVersion(dependencyEntry?.version);
 
-    return (
+    return version
-      extractConcreteVersion(lockfile.packages?.["node_modules/supabase"]?.version) ??
+      ? toPackageResolution(version, packageEntry?.integrity ?? dependencyEntry?.integrity)
-      extractConcreteVersion(lockfile.dependencies?.supabase?.version)
+      : null;
-    );
   } catch {
     return null;
   }
 }
 
-function resolveVersion(inputVersion: string): string {
+export function resolvePackage(inputVersion: string): PackageResolution {
   const requestedVersion = inputVersion.trim();
 
   if (requestedVersion) {
-    return requestedVersion;
+    return toPackageResolution(requestedVersion);
   }
 
   const workspaceRoot = process.env.GITHUB_WORKSPACE?.trim();
 
   if (!workspaceRoot) {
-    return DEFAULT_VERSION;
+    return toPackageResolution(DEFAULT_VERSION);
   }
 
   return (
-    detectVersionFromBunLock(workspaceRoot) ??
+    detectResolutionFromBunLock(workspaceRoot) ??
-    detectVersionFromPnpmLock(workspaceRoot) ??
+    detectResolutionFromPnpmLock(workspaceRoot) ??
-    detectVersionFromPackageLock(workspaceRoot) ??
+    detectResolutionFromPackageLock(workspaceRoot) ??
-    DEFAULT_VERSION
+    toPackageResolution(DEFAULT_VERSION)
   );
 }
 
-async function resolveLatestVersion(): Promise<string> {
+async function verifyExpectedIntegrity(resolution: PackageResolution): Promise<void> {
-  const headers: Record<string, string> = {
+  if (!resolution.integrity) {
-    Accept: "application/vnd.github+json",
+    return;
-    "X-GitHub-Api-Version": "2022-11-28",
-  };
-  const githubToken = process.env[GITHUB_TOKEN_ENV]?.trim();
-
-  if (githubToken) {
-    headers.Authorization = `Bearer ${githubToken}`;
   }
 
-  const response = await fetch(GITHUB_RELEASES_API, { headers });
+  const output = await runNpm(["view", resolution.spec, "dist.integrity", "--json"]);
-  if (!response.ok) {
+  const registryIntegrity = JSON.parse(output) as unknown;
-    throw new Error(`Failed to resolve latest Supabase CLI release: ${response.statusText}`);
-  }
 
-  const release = (await response.json()) as { tag_name?: unknown };
+  if (registryIntegrity !== resolution.integrity) {
-  if (typeof release.tag_name !== "string") {
+    throw new Error(`Lockfile integrity for ${resolution.spec} does not match the npm registry`);
-    throw new Error("Failed to resolve latest Supabase CLI release: missing tag name");
-  }
-
-  return normalizeVersion(release.tag_name);
-}
-
-function getArchiveFormat(
-  version: string,
-  platform: NodeJS.Platform,
-  isMuslLinux: boolean,
-): ArchiveFormat {
-  if (
-    platform === "linux" &&
-    isMuslLinux &&
-    semver.order(version, VERSIONED_ARCHIVE_VERSION) >= 0
-  ) {
-    return "apk";
-  }
-
-  if (platform === "win32" && semver.order(version, VERSIONED_ARCHIVE_VERSION) >= 0) {
-    return "zip";
-  }
-
-  return "tar";
-}
-
-function getArchiveFilename(
-  version: string,
-  platform: NodeJS.Platform,
-  arch: NodeJS.Architecture,
-  archiveFormat: ArchiveFormat,
-): string {
-  const archivePlatform = getArchivePlatform(platform);
-  const archiveArch = getArchiveArch(arch);
-
-  if (semver.order(version, REGISTRY_VERSION) === -1) {
-    return `supabase_${version}_${archivePlatform}_${archiveArch}.tar.gz`;
-  }
-
-  if (platform === "linux" && archiveFormat === "apk") {
-    return `supabase_${version}_${archivePlatform}_${archiveArch}.apk`;
-  }
-
-  if (semver.order(version, VERSIONED_ARCHIVE_VERSION) >= 0) {
-    const extension = platform === "win32" ? "zip" : "tar.gz";
-    return `supabase_${version}_${archivePlatform}_${archiveArch}.${extension}`;
-  }
-
-  return `supabase_${archivePlatform}_${archiveArch}.tar.gz`;
-}
-
-export async function getDownloadArchive(
-  version: string,
-  platform = process.platform,
-  arch = process.arch,
-  isMuslLinux?: boolean,
-): Promise<DownloadArchive> {
-  const resolvedVersion =
-    version.toLowerCase() === "latest" ? await resolveLatestVersion() : normalizeVersion(version);
-  const format = getArchiveFormat(
-    resolvedVersion,
-    platform,
-    isMuslLinux ?? (await detectMuslLinux(platform)),
-  );
-  const filename = getArchiveFilename(resolvedVersion, platform, arch, format);
-
-  return {
-    url: `https://github.com/supabase/cli/releases/download/v${resolvedVersion}/${filename}`,
-    format,
-  };
-}
-
-async function detectMuslLinux(platform = process.platform): Promise<boolean> {
-  if (platform !== "linux") {
-    return false;
-  }
-
-  if (existsSync("/etc/alpine-release")) {
-    return true;
-  }
-
-  try {
-    const output = await $`ldd --version`.quiet().text();
-    return output.toLowerCase().includes("musl");
-  } catch (error) {
-    const output = error instanceof Error ? error.message : String(error);
-    return output.toLowerCase().includes("musl");
   }
 }
 
-export function getCliPath(extractedPath: string, archiveFormat: ArchiveFormat): string {
+function createInstallRoot(): string {
-  return archiveFormat === "apk" ? path.join(extractedPath, "usr", "bin") : extractedPath;
+  const tempRoot = process.env.RUNNER_TEMP?.trim() || os.tmpdir();
+  return mkdtempSync(path.join(tempRoot, "setup-cli-"));
+}
+
+async function runNpm(args: string[]): Promise<string> {
+  const executable = process.env[NPM_EXECUTABLE_ENV]?.trim() || "npm";
+  const proc = Bun.spawn([executable, ...args], {
+    env: process.env,
+    stderr: "pipe",
+    stdout: "pipe",
+  });
+  const [stdout, stderr, exitCode] = await Promise.all([
+    new Response(proc.stdout).text(),
+    new Response(proc.stderr).text(),
+    proc.exited,
+  ]);
+
+  if (exitCode !== 0) {
+    throw new Error(stderr.trim() || `npm ${args.join(" ")} failed`);
+  }
+
+  return stdout;
+}
+
+export async function installCli(resolution: PackageResolution): Promise<string> {
+  await verifyExpectedIntegrity(resolution);
+
+  const installRoot = createInstallRoot();
+
+  await runNpm([
+    "install",
+    "--prefix",
+    installRoot,
+    "--omit=dev",
+    "--no-audit",
+    "--no-fund",
+    "--no-package-lock",
+    "--ignore-scripts",
+    resolution.spec,
+  ]);
+
+  return path.join(installRoot, "node_modules", ".bin");
 }
 
 function getCliExecutablePath(cliPath: string): string {
@@ -292,21 +263,36 @@ function getCliExecutablePath(cliPath: string): string {
     return path.join(cliPath, "supabase");
   }
 
-  const exePath = path.join(cliPath, "supabase.exe");
-  if (existsSync(exePath)) {
-    return exePath;
-  }
-
   const cmdPath = path.join(cliPath, "supabase.cmd");
   if (existsSync(cmdPath)) {
     return cmdPath;
   }
 
+  const exePath = path.join(cliPath, "supabase.exe");
+  if (existsSync(exePath)) {
+    return exePath;
+  }
+
   return path.join(cliPath, "supabase");
 }
 
 export async function determineInstalledVersion(cliPath: string): Promise<string> {
-  const version = (await $`${getCliExecutablePath(cliPath)} --version`.text()).trim();
+  const executable = getCliExecutablePath(cliPath);
+  const proc = Bun.spawn([executable, "--version"], {
+    stderr: "pipe",
+    stdout: "pipe",
+  });
+  const [stdout, stderr, exitCode] = await Promise.all([
+    new Response(proc.stdout).text(),
+    new Response(proc.stderr).text(),
+    proc.exited,
+  ]);
+
+  if (exitCode !== 0) {
+    throw new Error(stderr.trim() || "Could not determine installed Supabase CLI version");
+  }
+
+  const version = stdout.trim();
   if (!version) {
     throw new Error("Could not determine installed Supabase CLI version");
   }
@@ -314,21 +300,24 @@ export async function determineInstalledVersion(cliPath: string): Promise<string
   return version;
 }
 
+function shouldUseGhcrRegistry(requestedVersion: string, installedVersion: string): boolean {
+  if (requestedVersion.toLowerCase() === DEFAULT_VERSION) {
+    return true;
+  }
+
+  const concreteVersion = extractConcreteVersion(installedVersion);
+  return concreteVersion !== null && semver.order(concreteVersion, REGISTRY_VERSION) >= 0;
+}
+
 export async function run(): Promise<void> {
   try {
-    const version = resolveVersion(core.getInput("version"));
+    const resolution = resolvePackage(core.getInput("version"));
-    const archive = await getDownloadArchive(version);
+    const cliPath = await installCli(resolution);
-    const archivePath = await tc.downloadTool(archive.url);
-    const extractedPath =
-      archive.format === "zip"
-        ? await tc.extractZip(archivePath)
-        : await tc.extractTar(archivePath);
-    const cliPath = getCliPath(extractedPath, archive.format);
     const installedVersion = await determineInstalledVersion(cliPath);
     core.setOutput("version", installedVersion);
     core.addPath(cliPath);
 
-    if (version.toLowerCase() === "latest" || semver.order(version, REGISTRY_VERSION) >= 0) {
+    if (shouldUseGhcrRegistry(resolution.version, installedVersion)) {
       core.exportVariable(CLI_CONFIG_REGISTRY, "ghcr.io");
     }
   } catch (error) {