.cirrus.yml

task:
  name: Build Linux Kernel With LLVM
  container:
    image: ubuntu:latest
  env:
    CC: clang
    LD: ld.lld
    AR: llvm-ar
    NM: llvm-nm
    OBJCOPY: llvm-objcopy
    OBJDUMP: llvm-objdump
    STRIP: llvm-strip
  install_script:
    - apt-get update
    - apt-get install -y clang llvm lld build-essential libncurses-dev bison flex libssl-dev libelf-dev cpio inetutils-ping neofetch openssh-server busybox-static
  build_script:
    - make defconfig
    - make -j$(nproc) CC=$CC LD=$LD
    - tar -czvf kernel-build.tar.gz arch/x86/boot/bzImage
  rootfs_script:
    - mkdir -p rootfs/{bin,sbin,etc,proc,sys,usr/{bin,sbin},home}
    - cp /bin/busybox rootfs/bin/
    - echo "FOS" > rootfs/etc/hostname
    - |
      cat << 'EOF' > rootfs/etc/os-release
      NAME="FOS"
      VERSION="1.0"
      ID=fos
      ID_LIKE=linux
      VERSION_ID="1.0"
      PRETTY_NAME="FOS OS"
      HOME_URL="http://example.com/"
      EOF
    - mkdir -p rootfs/etc/ssh
    - cp /etc/ssh/sshd_config rootfs/etc/ssh/
    - mkdir -p rootfs/etc/init.d
    - |
      cat << 'EOF' > rootfs/etc/init.d/ssh
      #!/bin/sh
      /usr/sbin/sshd
      EOF
    - chmod +x rootfs/etc/init.d/ssh
    - cp /usr/bin/neofetch rootfs/usr/bin/
    - |
      cat << 'EOF' > rootfs/init
      #!/bin/sh
      mount -t proc none /proc
      mount -t sysfs none /sys
      echo "Welcome to FOS OS!"
      /usr/bin/neofetch
      /bin/sh
      EOF
    - chmod +x rootfs/init
    - for cmd in $(rootfs/bin/busybox --list); do
        [ ! -e rootfs/bin/$cmd ] && ln -s /bin/busybox rootfs/bin/$cmd;
      done
    - (cd rootfs && find . | cpio -H newc -ov --owner root:root | gzip > ../initramfs.img)
    - tar -czvf rootfs-build.tar.gz initramfs.img
  artifacts:
    kernel_build: kernel-build.tar.gz
    rootfs_build: rootfs-build.tar.gz