build-with-llvm.yml

name: LLVM Linux Kernel

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
  workflow_dispatch:

jobs:
  build:
    name: Build Kernel
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Set up dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y clang llvm lld build-essential libncurses-dev bison flex libssl-dev libelf-dev cpio

      - name: Build Kernel with LLVM
        run: |
          # Set LLVM environment variables
          export CC=clang
          export LD=ld.lld
          export AR=llvm-ar
          export NM=llvm-nm
          export OBJCOPY=llvm-objcopy
          export OBJDUMP=llvm-objdump
          export STRIP=llvm-strip
          
          # Build with LLVM
          make defconfig
          make -j$(nproc) CC=clang LD=ld.lld

      - name: Archive the Kernel Artifact
        run: |
          tar -czvf kernel-build.tar.gz arch/x86/boot/bzImage

      - name: Build Root Filesystem
        run: |
          # Prepare root filesystem structure
          mkdir -p rootfs/{bin,sbin,etc,proc,sys,usr/{bin,sbin}}
          
          # Copy busybox or basic binaries (assuming busybox is already available)
          # Install busybox if not available
          sudo apt-get install -y busybox
          cp /bin/busybox rootfs/bin/
          chroot rootfs /bin/busybox --install -s
          
          # Create init file
          cat << 'EOF' > rootfs/init
          #!/bin/sh
          mount -t proc none /proc
          mount -t sysfs none /sys
          echo "Welcome to your custom OS!"
          /bin/sh
          EOF
          chmod +x rootfs/init

          # Create initramfs image
          cd rootfs
          find . | cpio -H newc -ov --owner root:root | gzip > ../initramfs.img

      - name: Archive the RootFS Artifact
        run: |
          tar -czvf rootfs-build.tar.gz initramfs.img

      - name: Upload Kernel Artifact
        uses: actions/upload-artifact@v3
        with:
          name: kernel-build
          path: kernel-build.tar.gz

      - name: Upload RootFS Artifact
        uses: actions/upload-artifact@v3
        with:
          name: rootfs-build
          path: rootfs-build.tar.gz

  release:
    name: Release Kernel & RootFS
    needs: build
    runs-on: ubuntu-latest

    steps:
      - name: Download Kernel Artifact
        uses: actions/download-artifact@v3
        with:
          name: kernel-build

      - name: Download RootFS Artifact
        uses: actions/download-artifact@v3
        with:
          name: rootfs-build

      - name: Create GitHub Release
        id: create_release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: llVm${{ github.run_number }}
          release_name: LLVM Build v${{ github.run_number }}
          draft: false
          prerelease: false

      - name: Upload Kernel to Release
        uses: actions/upload-release-asset@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          upload_url: ${{ steps.create_release.outputs.upload_url }}
          asset_path: kernel-build.tar.gz
          asset_name: kernel-build.tar.gz
          asset_content_type: application/gzip

      - name: Upload RootFS to Release
        uses: actions/upload-release-asset@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          upload_url: ${{ steps.create_release.outputs.upload_url }}
          asset_path: rootfs-build.tar.gz
          asset_name: rootfs-build.tar.gz
          asset_content_type: application/gzip