Script to generate /lib/modules/`uname -r`/build directory

make-kernel-build-dir.sh

#!/bin/bash -e
#
# Extracted from: https://git.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=packages/linux

set -x

ARCH=$(uname -m)
KARCH=x86 # applies to x86_64 too (change for arm, etc.)

pkgdir=
_kernver=$(make kernelversion)$(git diff-index --quiet HEAD -- || echo "+")
_builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

echo "installing to ${_builddir}"
sleep 2

rm ${pkgdir}/lib/modules/${_kernver}/{source,build} || true
mkdir -p "${_builddir}"

# install documentation
cp -t "${_builddir}" -a Documentation

install -Dm644 vmlinux ${pkgdir}/usr/lib/modules/${_kernver}/build/vmlinux

install -Dt "${_builddir}" -m644 Makefile .config Module.symvers
install -Dt "${_builddir}/kernel" -m644 kernel/Makefile

mkdir "${_builddir}/.tmp_versions"

cp -t "${_builddir}" -a include scripts

install -Dt "${_builddir}/arch/${KARCH}" -m644 arch/${KARCH}/Makefile
install -Dt "${_builddir}/arch/${KARCH}/kernel" -m644 arch/${KARCH}/kernel/asm-offsets.s

if [[ ${CARCH} = i686 ]]; then
  install -t "${_builddir}/arch/${KARCH}" -m644 arch/${KARCH}/Makefile_32.cpu
fi

cp -t "${_builddir}/arch/${KARCH}" -a arch/${KARCH}/include

install -Dt "${_builddir}/drivers/md" -m644 drivers/md/*.h
install -Dt "${_builddir}/net/mac80211" -m644 net/mac80211/*.h

# http://bugs.archlinux.org/task/9912
install -Dt "${_builddir}/drivers/media/dvb-core" -m644 drivers/media/dvb-core/*.h

# http://bugs.archlinux.org/task/13146
install -Dt "${_builddir}/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/lgdt330x.h
install -Dt "${_builddir}/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

# http://bugs.archlinux.org/task/20402
install -Dt "${_builddir}/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
install -Dt "${_builddir}/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
install -Dt "${_builddir}/drivers/media/tuners" -m644 drivers/media/tuners/*.h

# add xfs and shmem for aufs building
mkdir -p "${_builddir}"/{fs/xfs,mm}

# copy in Kconfig files
find . -name Kconfig\* -exec install -Dm644 {} "${_builddir}/{}" \;

# add objtool for external module building and enabled VALIDATION_STACK option
if [[ -e tools/objtool/objtool ]]; then
  install -Dt "${_builddir}/tools/objtool" tools/objtool/objtool
fi

# remove unneeded architectures
for _arch in "${_builddir}"/arch/*/; do
  if [[ ${_arch} != */${KARCH}/ ]]; then
    rm -r "${_arch}"
  fi
done

# remove files already in linux-docs package
rm -r "${_builddir}/Documentation"

# Fix permissions
chmod -R u=rwX,go=rX "${_builddir}"

# strip scripts directory
while read -rd '' _binary; do
  case "$(file -bi "${_binary}")" in
    *application/x-sharedlib*)  _strip="${STRIP_SHARED}"   ;; # Libraries (.so)
    *application/x-archive*)    _strip="${STRIP_STATIC}"   ;; # Libraries (.a)
    *application/x-executable*) _strip="${STRIP_BINARIES}" ;; # Binaries
    *) continue ;;
  esac
  /usr/bin/strip ${_strip} "${_binary}"
done < <(find "${_builddir}/scripts" -type f -perm -u+w -print0 2>/dev/null)