name: 'Setup Build Environment'
description: 'Clones dependencies and exports mkbootimg/avbtool paths'

runs:
  using: composite
  steps:
    - shell: bash
      run: |
        set -euo pipefail
        mkdir -p "$GITHUB_WORKSPACE/kernel"
        mkdir -p "$GITHUB_WORKSPACE/git-repo"
        curl -L https://storage.googleapis.com/git-repo-downloads/repo -o "$GITHUB_WORKSPACE/git-repo/repo"
        chmod +x "$GITHUB_WORKSPACE/git-repo/repo"
        echo "$GITHUB_WORKSPACE/git-repo" >> "$GITHUB_PATH"

        if [ -d "$GITHUB_WORKSPACE/kernel_patches" ]; then rm -rf "$GITHUB_WORKSPACE/kernel_patches"; fi
        git clone https://github.com/WildKernels/kernel_patches.git "$GITHUB_WORKSPACE/kernel_patches"

        if [ -d "$GITHUB_WORKSPACE/AnyKernel3" ]; then rm -rf "$GITHUB_WORKSPACE/AnyKernel3"; fi
        git clone https://github.com/WildKernels/AnyKernel3.git -b gki-2.0 "$GITHUB_WORKSPACE/AnyKernel3"

        AOSP_MIRROR=https://android.googlesource.com
        BRANCH=main-kernel-2025
        git clone $AOSP_MIRROR/kernel/prebuilts/build-tools -b $BRANCH --depth 1 kernel-build-tools
        git clone $AOSP_MIRROR/platform/system/tools/mkbootimg -b $BRANCH --depth 1 mkbootimg

        echo "AVBTOOL=$GITHUB_WORKSPACE/kernel-build-tools/linux-x86/bin/avbtool" >> "$GITHUB_ENV"
        echo "MKBOOTIMG=$GITHUB_WORKSPACE/mkbootimg/mkbootimg.py" >> "$GITHUB_ENV"
        echo "UNPACK_BOOTIMG=$GITHUB_WORKSPACE/mkbootimg/unpack_bootimg.py" >> "$GITHUB_ENV"
        echo "BOOT_SIGN_KEY_PATH=$GITHUB_WORKSPACE/kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem" >> "$GITHUB_ENV"

        mkdir -p "$GITHUB_WORKSPACE/kernel-build-tools/linux-x86/share/avb"
        if [ -z "${BOOT_SIGN_KEY:-}" ]; then
          exit 1
        fi

        KEY_PATH="$GITHUB_WORKSPACE/kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem"
        printf '%s' "$BOOT_SIGN_KEY" > "$KEY_PATH"
        if ! head -n 1 "$KEY_PATH" | grep -q 'BEGIN'; then
          printf '%s' "$BOOT_SIGN_KEY" | base64 -d > "$KEY_PATH"
        fi
        chmod 600 "$KEY_PATH"