test: use TEST_TMPDIR as fallback for E2E temporary directory

Use Bazel's TEST_TMPDIR when E2E_TEMP is not set so that E2E projects and package caches are created on the main disk inside the Bazel test sandbox rather than /tmp (which is a quota-limited tmpfs on ubuntu-26.04). This also allows reverting E2E CI jobs back to ubuntu-latest.

Author: alan-agius4

.github/workflows/ci.yml

@@ -81,10 +81,7 @@ jobs:
         node: [22, 24, 26]
         subset: [esbuild, webpack]
         shard: [0, 1, 2, 3, 4, 5]
-    # Pin to ubuntu-24.04 because on ubuntu-26.04 /tmp is mounted as a tmpfs with a 7.8GB quota,
-    # causing disk quota exceeded (EDQUOT) errors during E2E package extraction.
-    # See: https://github.com/actions/runner-images/issues/14777
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@c0b8d59ecb851e0dd1808f3d00846d5f2c0c8d47 # main
@@ -164,10 +161,7 @@ jobs:
         node: [22]
         subset: [yarn, pnpm, bun]
         shard: [0, 1, 2]
-    # Pin to ubuntu-24.04 because on ubuntu-26.04 /tmp is mounted as a tmpfs with a 7.8GB quota,
-    # causing disk quota exceeded (EDQUOT) errors during E2E package extraction.
-    # See: https://github.com/actions/runner-images/issues/14777
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@c0b8d59ecb851e0dd1808f3d00846d5f2c0c8d47 # main
@@ -191,10 +185,7 @@ jobs:
         node: [22]
         subset: [esbuild, webpack]
         shard: [0, 1, 2, 3, 4, 5]
-    # Pin to ubuntu-24.04 because on ubuntu-26.04 /tmp is mounted as a tmpfs with a 7.8GB quota,
-    # causing disk quota exceeded (EDQUOT) errors during E2E package extraction.
-    # See: https://github.com/actions/runner-images/issues/14777
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@c0b8d59ecb851e0dd1808f3d00846d5f2c0c8d47 # main

.github/workflows/pr.yml

@@ -111,10 +111,7 @@ jobs:
         node: [22]
         subset: [esbuild, webpack]
         shard: [0, 1, 2, 3, 4, 5]
-    # Pin to ubuntu-24.04 because on ubuntu-26.04 /tmp is mounted as a tmpfs with a 7.8GB quota,
-    # causing disk quota exceeded (EDQUOT) errors during E2E package extraction.
-    # See: https://github.com/actions/runner-images/issues/14777
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@c0b8d59ecb851e0dd1808f3d00846d5f2c0c8d47 # main
@@ -183,10 +180,7 @@ jobs:
         node: [22]
         subset: [yarn, pnpm, bun]
         shard: [0, 1, 2]
-    # Pin to ubuntu-24.04 because on ubuntu-26.04 /tmp is mounted as a tmpfs with a 7.8GB quota,
-    # causing disk quota exceeded (EDQUOT) errors during E2E package extraction.
-    # See: https://github.com/actions/runner-images/issues/14777
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@c0b8d59ecb851e0dd1808f3d00846d5f2c0c8d47 # main
@@ -208,10 +202,7 @@ jobs:
         node: [22]
         subset: [esbuild, webpack]
         shard: [0, 1, 2, 3, 4, 5]
-    # Pin to ubuntu-24.04 because on ubuntu-26.04 /tmp is mounted as a tmpfs with a 7.8GB quota,
-    # causing disk quota exceeded (EDQUOT) errors during E2E package extraction.
-    # See: https://github.com/actions/runner-images/issues/14777
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@c0b8d59ecb851e0dd1808f3d00846d5f2c0c8d47 # main

tests/e2e/utils/utils.ts

@@ -19,7 +19,11 @@ export function expectToFail(fn: () => Promise<any>, errorMessage?: string): Pro
 }
 
 export async function mktempd(prefix: string, tempRoot?: string): Promise<string> {
-  return realpath(await mkdtemp(path.join(tempRoot ?? tmpdir(), prefix)));
+  return realpath(
+    await mkdtemp(
+      path.join(tempRoot ?? process.env.E2E_TEMP ?? process.env.TEST_TMPDIR ?? tmpdir(), prefix),
+    ),
+  );
 }
 
 export async function mockHome(cb: (home: string) => Promise<void>): Promise<void> {

tests/e2e_runner.ts

@@ -217,7 +217,7 @@ process.env.CHROME_PATH = path.resolve(process.env.CHROME_PATH!);
 process.env.CHROMEDRIVER_BIN = path.resolve(process.env.CHROMEDRIVER_BIN!);
 
 (async () => {
-  const tempRoot = await mktempd('angular-cli-e2e-', process.env.E2E_TEMP);
+  const tempRoot = await mktempd('angular-cli-e2e-');
   setGlobalVariable('tmp-root', tempRoot);
 
   process.on('SIGINT', deleteTemporaryRoot);