[MAINT] Add chron job for updating OS compiler dependencies

.github/sycl-build-deps.env

@@ -0,0 +1,8 @@
+# Open source SYCL build deps, loaded by os-llvm-sycl-build.yml and bumped by
+# bump-sycl-deps.yml from intel/llvm devops/dependencies.json.
+# Kept out of .github/workflows/ since GITHUB_TOKEN can't push workflow files.
+DRIVER_PATH=2026-WW28
+OCLCPUEXP_FN=oclcpuexp-2026.22.6.1.17_160000_rel.tar.gz
+TBB_URL=https://github.com/uxlfoundation/oneTBB/releases/download/v2023.1.0/
+TBB_INSTALL_DIR=oneapi-tbb-2023.1.0
+TBB_FN=oneapi-tbb-2023.1.0-lin.tgz

.github/workflows/bump-sycl-deps.yml

@@ -0,0 +1,134 @@
+name: Bump open source SYCL build deps
+
+# Syncs the oclcpuexp and oneTBB pins in .github/sycl-build-deps.env, used by
+# os-llvm-sycl-build.yml, with intel/llvm devops/dependencies.json.
+
+on:
+  schedule:
+    - cron: "0 6 * * 6"
+  workflow_dispatch:
+    inputs:
+      llvm-ref:
+        description: "intel/llvm branch, tag or commit to read dependencies.json from"
+        required: false
+        default: sycl
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  bump:
+    name: Bump oclcpuexp and oneTBB pins
+    # disable scheduled workflow to be run in forks
+    if: github.event_name != 'schedule' || github.repository == 'IntelPython/dpctl'
+
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    permissions:
+      # push the branch with the updated pins
+      contents: write
+      # open a pull request from that branch
+      pull-requests: write
+
+    env:
+      PINS: .github/sycl-build-deps.env
+      GH_TOKEN: ${{ github.token }}
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Read intel/llvm dependencies.json
+        id: resolve
+        env:
+          LLVM_REF: ${{ inputs.llvm-ref || 'sycl' }}
+        run: |
+          set -euo pipefail
+          fail() { echo "::error::$*"; exit 1; }
+
+          [[ "${LLVM_REF}" =~ ^[A-Za-z0-9._/-]+$ && "${LLVM_REF}" != *..* ]] \
+              || fail "invalid intel/llvm ref: ${LLVM_REF}"
+          LLVM_SHA=$(gh api "repos/intel/llvm/commits/${LLVM_REF}" --jq .sha)
+          [[ "${LLVM_SHA}" =~ ^[0-9a-f]{40}$ ]] || fail "unexpected intel/llvm sha: ${LLVM_SHA}"
+          DEPS="${RUNNER_TEMP}/dependencies.json"
+          gh api -H "Accept: application/vnd.github.raw" \
+              "repos/intel/llvm/contents/devops/dependencies.json?ref=${LLVM_SHA}" > "${DEPS}"
+
+          OCL_TAG=$(jq -er '.linux.oclcpu.github_tag' "${DEPS}")
+          OCL_URL=$(jq -er '.linux.oclcpu.url' "${DEPS}")
+          TBB_VER=$(jq -er '.linux.tbb.version' "${DEPS}")
+          TBB_FULL_URL=$(jq -er '.linux.tbb.url' "${DEPS}")
+          OCLCPUEXP_FN=${OCL_URL##*/}
+
+          # os-llvm-sycl-build.yml rebuilds these URLs from the pins
+          [[ "${OCL_TAG}" =~ ^[0-9]{4}-WW[0-9]+$ ]] || fail "unexpected oclcpu tag: ${OCL_TAG}"
+          [[ "${OCLCPUEXP_FN}" =~ ^oclcpuexp-[0-9A-Za-z._]+_rel\.tar\.gz$ ]] \
+              || fail "unexpected oclcpu asset: ${OCLCPUEXP_FN}"
+          [[ "${OCL_URL}" == "https://github.com/intel/llvm/releases/download/${OCL_TAG}/${OCLCPUEXP_FN}" ]] \
+              || fail "unexpected oclcpu url: ${OCL_URL}"
+          [[ "${TBB_VER}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || fail "unexpected tbb version: ${TBB_VER}"
+          [[ "${TBB_FULL_URL}" == "https://github.com/uxlfoundation/oneTBB/releases/download/v${TBB_VER}/oneapi-tbb-${TBB_VER}-lin.tgz" ]] \
+              || fail "unexpected tbb url: ${TBB_FULL_URL}"
+
+          {
+            echo "llvm_sha=${LLVM_SHA}"
+            echo "driver_tag=${OCL_TAG}"
+            echo "oclcpuexp_fn=${OCLCPUEXP_FN}"
+            echo "tbb_ver=${TBB_VER}"
+            echo "tbb_url=${TBB_FULL_URL%/*}/"
+            echo "tbb_fn=${TBB_FULL_URL##*/}"
+            echo "tbb_dir=oneapi-tbb-${TBB_VER}"
+          } | tee -a "${GITHUB_OUTPUT}"
+
+      - name: Apply pins
+        env:
+          DRIVER_TAG: ${{ steps.resolve.outputs.driver_tag }}
+          OCLCPUEXP_FN: ${{ steps.resolve.outputs.oclcpuexp_fn }}
+          TBB_URL: ${{ steps.resolve.outputs.tbb_url }}
+          TBB_FN: ${{ steps.resolve.outputs.tbb_fn }}
+          TBB_DIR: ${{ steps.resolve.outputs.tbb_dir }}
+        run: |
+          set -euo pipefail
+          sed -i -E \
+            -e "s|^(DRIVER_PATH=).*|\1${DRIVER_TAG}|" \
+            -e "s|^(OCLCPUEXP_FN=).*|\1${OCLCPUEXP_FN}|" \
+            -e "s|^(TBB_URL=).*|\1${TBB_URL}|" \
+            -e "s|^(TBB_INSTALL_DIR=).*|\1${TBB_DIR}|" \
+            -e "s|^(TBB_FN=).*|\1${TBB_FN}|" \
+            "${PINS}"
+          git diff -- "${PINS}"
+
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
+        with:
+          token: ${{ github.token }}
+          add-paths: ${{ env.PINS }}
+          branch: bot/bump-sycl-build-deps
+          delete-branch: true
+          labels: autoupdate
+          commit-message: |
+            Bump oclcpuexp/oneTBB pins for os-llvm-sycl-build workflow
+
+            oclcpuexp: ${{ steps.resolve.outputs.driver_tag }} / ${{ steps.resolve.outputs.oclcpuexp_fn }}
+            oneTBB: ${{ steps.resolve.outputs.tbb_ver }}
+            intel/llvm: ${{ steps.resolve.outputs.llvm_sha }}
+          title: "Bump open source SYCL build dependencies"
+          body: |
+            Syncs `.github/sycl-build-deps.env` with intel/llvm
+            [`devops/dependencies.json`](https://github.com/intel/llvm/blob/${{ steps.resolve.outputs.llvm_sha }}/devops/dependencies.json).
+
+            | dependency | version |
+            | --- | --- |
+            | intel/llvm driver release | `${{ steps.resolve.outputs.driver_tag }}` |
+            | oclcpuexp | `${{ steps.resolve.outputs.oclcpuexp_fn }}` |
+            | oneTBB | `${{ steps.resolve.outputs.tbb_ver }}` |
+
+            Pull requests opened by this workflow don't trigger CI: run
+            **Build with Open Source LLVM SYCL compiler** on this branch before merging.

.github/workflows/os-llvm-sycl-build.yml

@@ -3,6 +3,7 @@ on:
   pull_request:
   push:
     branches: [master]
+  workflow_dispatch:
 
 permissions:
   contents: read
@@ -17,18 +18,33 @@ jobs:
 
     env:
       DOWNLOAD_URL_PREFIX: https://github.com/intel/llvm/releases/download
-      DRIVER_PATH: 2026-WW28
-      OCLCPUEXP_FN: oclcpuexp-2026.22.6.1.17_160000_rel.tar.gz
-      TBB_URL: https://github.com/uxlfoundation/oneTBB/releases/download/v2023.1.0/
-      TBB_INSTALL_DIR: oneapi-tbb-2023.1.0
-      TBB_FN: oneapi-tbb-2023.1.0-lin.tgz
 
     steps:
       - name: Cancel Previous Runs
         uses: styfle/cancel-workflow-action@d07a454dad7609a92316b57b23c9ccfd4f59af66 # 0.13.1
         with:
           access_token: ${{ github.token }}
 
+      - name: Checkout repo
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+
+      - name: Load pinned SYCL build deps
+        shell: bash -l {0}
+        env:
+          PINS: .github/sycl-build-deps.env
+        run: |
+          set -euo pipefail
+          VARS=$(grep -E '^(DRIVER_PATH|OCLCPUEXP_FN|TBB_URL|TBB_INSTALL_DIR|TBB_FN)=' "${PINS}" || true)
+          if [[ $(wc -l <<< "${VARS}") -ne 5 ]]; then
+              echo "::error::expected 5 pins in ${PINS}, got:"
+              echo "${VARS}"
+              exit 1
+          fi
+          echo "${VARS}" | tee -a "${GITHUB_ENV}"
+
       - name: Install hwloc
         shell: bash -l {0}
         run: |
@@ -45,7 +61,7 @@ jobs:
         with:
           path: |
             /home/runner/work/sycl_bundle
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('/home/runner/work/sycl_bundle/bundle_id.txt') }}
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('.github/sycl-build-deps.env') }}
           restore-keys: |
             ${{ runner.os }}-build-${{ env.cache-name }}-
             ${{ runner.os }}-build-
@@ -106,17 +122,26 @@ jobs:
               else
                 rm -rf bundle_id.txt
               fi
-              [ -f "${OCLCPUEXP_FN}" ] || wget "${DOWNLOAD_URL_PREFIX}/${DRIVER_PATH}/${OCLCPUEXP_FN}" || rm -rf bundle_id.txt
-              [ -f "${TBB_FN}" ] || wget "${TBB_URL}/${TBB_FN}" || rm -rf bundle_id.txt
               rm -rf dpcpp_compiler
               mkdir -p dpcpp_compiler
               tar xf "${ARTIFACT_NAME}.tar.gz" -C dpcpp_compiler
-              mkdir -p oclcpuexp
-              [ -d oclcpuexp/x64 ] || tar xf "${OCLCPUEXP_FN}" -C oclcpuexp
-              [ -d "${TBB_INSTALL_DIR}/lib" ] || tar xf "${TBB_FN}"
-              cp oclcpuexp/x64/libOpenCL.so* dpcpp_compiler/lib/
           fi
 
+          # pinned deps are fetched independently of the nightly, so a pin
+          # change replaces whatever the cache restored
+          if [ ! -f "${OCLCPUEXP_FN}" ]; then
+              rm -rf oclcpuexp oclcpuexp-*.tar.gz
+              wget "${DOWNLOAD_URL_PREFIX}/${DRIVER_PATH}/${OCLCPUEXP_FN}" || exit 1
+          fi
+          if [ ! -f "${TBB_FN}" ]; then
+              rm -rf oneapi-tbb-*
+              wget "${TBB_URL}/${TBB_FN}" || exit 1
+          fi
+          mkdir -p oclcpuexp
+          [ -d oclcpuexp/x64 ] || tar xf "${OCLCPUEXP_FN}" -C oclcpuexp
+          [ -d "${TBB_INSTALL_DIR}/lib" ] || tar xf "${TBB_FN}"
+          cp oclcpuexp/x64/libOpenCL.so* dpcpp_compiler/lib/
+
       - name: Setup Python
         uses: actions/setup-python@6d4fd22b20465ccc0f7354476588e8df7c9ca0e0 # v7.1.0
         with:
@@ -128,12 +153,6 @@ jobs:
         run: |
           pip install numpy cython setuptools"<80" pytest scikit-build cmake ninja versioneer[toml]==0.29
 
-      - name: Checkout repo
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
-          fetch-depth: 0
-
       - name: Create set_allvars.sh
         shell: bash -l {0}
         run: |