linux-container.spec-template

#
# This is a special configuration of the Linux kernel, aimed exclusively
# for running inside a container
# This specialization allows us to optimize memory footprint and boot time.
#

Name:           linux-container
Version:        @VERSION@
Release:        @RELEASE@.<B_CNT>
License:        GPL-2.0
Summary:        The Linux kernel optimized for running inside a container
Url:            http://www.kernel.org/
Group:          kernel
Source0:        https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-@VERSION@.tar.xz
Source1:        config

%define kversion %{version}-%{release}.container

BuildRequires:  bash >= 2.03
BuildRequires:  bc
BuildRequires:  binutils-devel

%if 0%{?rhel_version}
BuildRequires:  elfutils-devel
%endif

%if 0%{?suse_version}
BuildRequires:  libelf-devel
%endif

%if 0%{?fedora} || 0%{?centos_version}
BuildRequires:  pkgconfig(libelf)
%endif

BuildRequires:  make >= 3.78
BuildRequires:  openssl-devel
BuildRequires:  flex
BuildRequires:  bison

# don't strip .ko files!
%global __os_install_post %{nil}
%define debug_package %{nil}
%define __strip /bin/true

# Patches
Patch0001: 0001-HACK-9P-always-use-cached-inode-to-fill-in-v9fs_vfs_.patch

%description
The Linux kernel.

%package debug
Summary: Debug components for the linux-container package.
Group: Default

%description debug
Debug components for the linux-container package.
This package includes the kernel config and the kernel map.

%prep
%setup -q -n linux-@VERSION@

# Patches
%patch0001 -p1

cp %{SOURCE1} .

%build
BuildKernel() {

    Arch=x86_64
    ExtraVer="-%{release}.container"

    perl -p -i -e "s/^EXTRAVERSION.*/EXTRAVERSION = ${ExtraVer}/" Makefile

    make -s mrproper
    cp config .config

    make -s ARCH=$Arch oldconfig > /dev/null
    make -s CONFIG_DEBUG_SECTION_MISMATCH=y %{?_smp_mflags} ARCH=$Arch %{?sparse_mflags} || exit 1
}

BuildKernel

%install

InstallKernel() {
    KernelImage=$1
    KernelImageRaw=$2

    Arch=x86_64
    KernelVer=%{kversion}
    KernelDir=%{buildroot}/usr/share/clear-containers

    mkdir   -p ${KernelDir}

    cp $KernelImage ${KernelDir}/vmlinuz-$KernelVer
    chmod 755 ${KernelDir}/vmlinuz-$KernelVer
    ln -sf vmlinuz-$KernelVer ${KernelDir}/vmlinuz.container

    cp $KernelImageRaw ${KernelDir}/vmlinux-$KernelVer
    chmod 755 ${KernelDir}/vmlinux-$KernelVer
    ln -sf vmlinux-$KernelVer ${KernelDir}/vmlinux.container

    cp .config "${KernelDir}/config-${KernelVer}"
    cp System.map "${KernelDir}/System.map-${KernelVer}"

    rm -f %{buildroot}/usr/lib/modules/$KernelVer/build
    rm -f %{buildroot}/usr/lib/modules/$KernelVer/source
}

InstallKernel arch/x86/boot/bzImage vmlinux

rm -rf %{buildroot}/usr/lib/firmware

%files
%dir /usr/share/clear-containers
/usr/share/clear-containers/vmlinux-%{kversion}
/usr/share/clear-containers/vmlinux.container
/usr/share/clear-containers/vmlinuz-%{kversion}
/usr/share/clear-containers/vmlinuz.container

%files debug
%defattr(-,root,root,-)
/usr/share/clear-containers/config-%{kversion}
/usr/share/clear-containers/System.map-%{kversion}