# This is the source.sh script. It is executed by BPM in a temporary directory when compiling a source package
# BPM Expects the source code to be extracted into the automatically created 'source' directory which can be accessed using $BPM_SOURCE
# BPM Expects the output files to be present in the automatically created 'output' directory which can be accessed using $BPM_OUTPUT

DOWNLOAD="https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-${BPM_PKG_VERSION}.tar.xz"
FILENAME="${DOWNLOAD##*/}"

# The prepare function is executed in the root of the temp directory
# This function is used for downloading files and putting them into the correct location
prepare() {
  wget "$DOWNLOAD"
  tar -xvf "$FILENAME" --strip-components=1 -C "$BPM_SOURCE"
  cd "$BPM_SOURCE"
  make mrproper
  cp ../config .config
}

# The build function is executed in the source directory
# This function is used to compile the source code
build() {
  make olddefconfig
  make
  make headers
}

# The package function is executed in the source directory
# This function is used to move the compiled files into the output directory
package() {
  # Install kernel modules
  make INSTALL_MOD_PATH="$BPM_OUTPUT" modules_install

  # Install kernel image and config
  install -Dm644 arch/x86/boot/bzImage "$BPM_OUTPUT"/boot/vmlinuz-"$BPM_PKG_VERSION"-tide
  install -Dm644 .config "$BPM_OUTPUT"/boot/config-"$BPM_PKG_VERSION"-tide

  # Install kernel headers
  find usr/include -type f ! -name '*.h' -delete
  install -d "$BPM_OUTPUT"/usr/include
  cp -r usr/include/. "$BPM_OUTPUT"/usr/include/

  # Install documentation
  install -d "$BPM_OUTPUT"/usr/share/doc/
  cp -r Documentation "$BPM_OUTPUT"/usr/share/doc/linux-"$BPM_PKG_VERSION"-tide
}