build: fix linux tests (#42496)

* build: use runuser for electron spec runner

* chown

* run tests in priv

* fixed

* build: setup testing on arm for GHA

* no build-tools for test

* start xvfb for the right user

* no more gn-build-type

* debug env

* ue xvfb-run

* use 8 core for node tests

* build: do test sharding on linux

* fix: disable hung node test

* build: index splits are hard

* build: use --init to reap children

* allow write junit

* use custom xvfb wrapper

* pipefail

* dont kill xvfb, its already dead

---------

Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>

.github/workflows/pipeline-segment-electron-test.yml

@@ -20,11 +20,6 @@ on:
         description: 'JSON container information for aks runs-on'
         required: false
         default: '{"image":null}'
-      gn-build-type:
-        description: 'The gn build type - testing or release'
-        required: true
-        type: string
-        default: testing
 
 concurrency:
   group: electron-test-${{ inputs.target-platform }}-${{ inputs.target-arch }}-${{ github.ref }}
@@ -42,16 +37,11 @@ jobs:
       fail-fast: false
       matrix:
         build-type: ${{ inputs.target-platform == 'macos' && fromJSON('["darwin","mas"]') || fromJSON('["linux"]') }}
+        shard: ${{ inputs.target-platform == 'macos' && fromJSON('[1]') || fromJSON('[1, 2, 3]') }}
     env:
       BUILD_TYPE: ${{ matrix.build-type }}
       TARGET_ARCH: ${{ inputs.target-arch }}
     steps:
-    - name: Load Build Tools
-      run: |
-        export BUILD_TOOLS_SHA=ef894bc3cfa99d84a3b731252da0f83f500e4032
-        npm i -g @electron/build-tools
-        e auto-update disable
-        e init --root=$(pwd) --out=Default ${{ inputs.gn-build-type }} --import ${{ inputs.gn-build-type }} --target-cpu ${{ inputs.target-arch }}
     - name: Checkout Electron
       uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
       with:
@@ -103,9 +93,6 @@ jobs:
     #     sudo security authorizationdb write com.apple.trust-settings.admin allow
     #     cd src/electron
     #     ./script/codesign/generate-identity.sh
-    - name: Setup for headless testing
-      if: ${{ inputs.target-platform == 'linux' }}
-      run: sh -e /etc/init.d/xvfb start
     - name: Run Electron Tests
       env:
         MOCHA_REPORTER: mocha-multi-reporters
@@ -113,9 +100,21 @@ jobs:
         MOCHA_MULTI_REPORTERS: mocha-junit-reporter, tap
         ELECTRON_DISABLE_SECURITY_WARNINGS: 1
         ELECTRON_SKIP_NATIVE_MODULE_TESTS: true
+        DISPLAY: ':99.0'
       run: |
         cd src/electron
-        node script/yarn test --runners=main --trace-uncaught --enable-logging
+        # Get which tests are on this shard
+        tests_files=$(node script/split-tests ${{ matrix.shard }} ${{ inputs.target-platform == 'macos' && 1 || 3 }})
+
+        # Run tests
+        if [ "`uname`" = "Darwin" ]; then
+          node script/yarn test --runners=main --trace-uncaught --enable-logging
+        else
+          chown :builduser .. && chmod g+w ..
+          chown -R :builduser . && chmod -R g+w .
+          chmod 4755 ../out/Default/chrome-sandbox
+          runuser -u builduser -- xvfb-run script/actions/run-tests.sh script/yarn test --runners=main --trace-uncaught --enable-logging --files $tests_files
+        fi
     - name: Wait for active SSH sessions
       if: always() && !cancelled()
       run: |