GKI_KernelSU_SUSFS/.github/actions/download-kernel/action.yml

name: 'Download Kernel Repository'
description: 'Initialize and sync Android kernel source repository'

inputs:
  android_version:
    description: 'Android version (e.g., android14)'
    required: true
  kernel_version:
    description: 'Kernel version (e.g., 5.15, 6.1)'
    required: true
  version:
    description: 'Combined version (e.g., android14-6.1)'
    required: true
  os_patch_level:
    description: 'OS patch level (e.g., 2024-01)'
    required: true
  use_repo:
    description: 'Use repo for downloading kernel source'
    required: false

outputs:
  deprecated_branch:
    description: 'Whether the branch is deprecated'
    value: ${{ steps.sync.outputs.deprecated }}

runs:
  using: composite
  steps:
    - name: Initialize and Sync Kernel Repository
      if: ${{ inputs.use_repo == 'true' }}
      id: sync
      shell: bash
      working-directory: ${{ github.workspace }}/kernel
      run: |
        set -euo pipefail

        # Derive android and kernel from combined version when available
        VERSION="${{ inputs.version }}"
        ANDROID_PART=$(echo "$VERSION" | cut -d- -f1)
        KERNEL_PART=$(echo "$VERSION" | cut -d- -f2)
        FORMATTED_BRANCH="${ANDROID_PART}-${KERNEL_PART}-${{ inputs.os_patch_level }}"

        init_repo() {
          repo init -u https://android.googlesource.com/kernel/manifest -b common-${FORMATTED_BRANCH} --depth=1 || { echo "ERROR: repo init failed" >&2; return 1; }
          REMOTE_BRANCH=$(git ls-remote https://android.googlesource.com/kernel/common ${FORMATTED_BRANCH}) || { echo "ERROR: git ls-remote failed" >&2; return 1; }
          DEFAULT_MANIFEST_PATH=.repo/manifests/default.xml
          DEPRECATED=false
          if grep -q deprecated <<< "$REMOTE_BRANCH"; then
            sed -i "s/\"${FORMATTED_BRANCH}\"/\"deprecated\/${FORMATTED_BRANCH}\"/g" "$DEFAULT_MANIFEST_PATH"
            echo "⚠ Note: Branch ${FORMATTED_BRANCH} is considered deprecated."
            DEPRECATED=true
          fi
          echo "deprecated=$DEPRECATED" >> $GITHUB_OUTPUT
        }

        init_repo || { echo "ERROR: init_repo failed" >&2; exit 1; }

        MAX_RETRIES=3
        RETRY_DELAY_SHORT=15
        SYNC_TIMEOUT="15m"
        attempt=1

        while [ $attempt -le $MAX_RETRIES ]; do
          echo "Attempt $attempt/$MAX_RETRIES: repo sync (timeout $SYNC_TIMEOUT)..."
          # Use minimal-shallow variant: current-branch, shallow init done above, reduce files downloaded
          if timeout $SYNC_TIMEOUT repo sync -c --current-branch --no-clone-bundle --no-tags --jobs-checkout=4 -j4; then
            echo "repo sync succeeded on attempt $attempt."
            break
          fi
          rc=$?
          if [ $rc -eq 124 ]; then
            echo "repo sync timed out after $SYNC_TIMEOUT."
          else
            echo "repo sync failed with exit code $rc."
          fi
          if [ $attempt -lt $MAX_RETRIES ]; then
            echo "Cleaning workspace and retrying after ${RETRY_DELAY_SHORT}s..."
            rm -rf .repo || true
            sleep $RETRY_DELAY_SHORT
            init_repo
          else
            echo "All $MAX_RETRIES attempts failed." >&2
            exit $rc
          fi
          attempt=$((attempt+1))
        done

    - name: Download manifest.xml for branch (with deprecated fallback)
      shell: bash
      if: ${{ inputs.use_repo != 'true' }}
      working-directory: ${{ github.workspace }}/kernel
      run: |
        set -euo pipefail
        VERSION="${{ inputs.version }}"
        ANDROID_PART=$(echo "$VERSION" | cut -d- -f1)
        KERNEL_PART=$(echo "$VERSION" | cut -d- -f2)
        FORMATTED_BRANCH="${ANDROID_PART}-${KERNEL_PART}-${{ inputs.os_patch_level }}"
        MAIN_MANIFEST_URL="https://android.googlesource.com/kernel/manifest/+/refs/heads/common-${FORMATTED_BRANCH}/default.xml?format=TEXT"
        DEPRECATED_MANIFEST_URL="https://android.googlesource.com/kernel/manifest/+/refs/heads/deprecated/common-${FORMATTED_BRANCH}/default.xml?format=TEXT"
        echo "Trying to fetch manifest from $MAIN_MANIFEST_URL"
        if curl -fsSL "$MAIN_MANIFEST_URL" | base64 -d > manifest.xml; then
          echo "Fetched manifest from $MAIN_MANIFEST_URL"
        else
          echo "Main manifest fetch failed, trying deprecated branch."
          echo "⚠ Note: Branch common-${FORMATTED_BRANCH} is considered deprecated."
          if curl -fsSL "$DEPRECATED_MANIFEST_URL" | base64 -d > manifest.xml; then
            echo "Fetched manifest from $DEPRECATED_MANIFEST_URL"
          else
            echo "ERROR: Neither main nor deprecated branch exists for $FORMATTED_BRANCH" >&2
            exit 22
          fi
        fi

    - name: Debug Show manifest.xml
      shell: bash
      if: ${{ inputs.use_repo != 'true' }}
      working-directory: ${{ github.workspace }}/kernel
      run: cat manifest.xml
      
    - name: Fast Parallel Archive Download
      shell: bash
      if: ${{ inputs.use_repo != 'true' }}
      working-directory: ${{ github.workspace }}/kernel
      run: |
        python "${{ github.workspace }}/.github/actions/download-kernel/fast_parallel_download.py"

    - name: Capture Kernel Common Commit Metadata
      shell: bash
      working-directory: ${{ github.workspace }}/kernel
      run: |
        set -euo pipefail

        if [[ ! -d common ]]; then
          echo "WARNING: common folder not found; skipping commit metadata capture."
          exit 0
        fi

        cd common

        if [[ ! -d .git ]]; then
          echo "WARNING: common is not a git checkout; skipping commit metadata capture."
          exit 0
        fi

        COMMIT_DATE=$(git log -1 --format=%cI)
        COMMIT_MSG=$(git log -1 --format=%s)

        echo "Kernel common commit date: $COMMIT_DATE"
        echo "Kernel common commit msg: $COMMIT_MSG"