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linux/scripts/package/mkspec
Masahiro Yamada b7dca6dd1e kbuild: create *.mod with full directory path and remove MODVERDIR 
While descending directories, Kbuild produces objects for modules,
but do not link final *.ko files; it is done in the modpost.

To keep track of modules, Kbuild creates a *.mod file in $(MODVERDIR)
for every module it is building. Some post-processing steps read the
necessary information from *.mod files. This avoids descending into
directories again. This mechanism was introduced in 2003 or so.

Later, commit 551559e13a ("kbuild: implement modules.order") added
modules.order. So, we can simply read it out to know all the modules
with directory paths. This is easier than parsing the first line of
*.mod files.

$(MODVERDIR) has a flat directory structure, that is, *.mod files
are named only with base names. This is based on the assumption that
the module name is unique across the tree. This assumption is really
fragile.

Stephen Rothwell reported a race condition caused by a module name
conflict:

  https://lkml.org/lkml/2019/5/13/991

In parallel building, two different threads could write to the same
$(MODVERDIR)/*.mod simultaneously.

Non-unique module names are the source of all kind of troubles, hence
commit 3a48a91901 ("kbuild: check uniqueness of module names")
introduced a new checker script.

However, it is still fragile in the build system point of view because
this race happens before scripts/modules-check.sh is invoked. If it
happens again, the modpost will emit unclear error messages.

To fix this issue completely, create *.mod with full directory path
so that two threads never attempt to write to the same file.

$(MODVERDIR) is no longer needed.

Since modules with directory paths are listed in modules.order, Kbuild
is still able to find *.mod files without additional descending.

I also killed cmd_secanalysis; scripts/mod/sumversion.c computes MD4 hash
for modules with MODULE_VERSION(). When CONFIG_DEBUG_SECTION_MISMATCH=y,
it occurs not only in the modpost stage, but also during directory
descending, where sumversion.c may parse stale *.mod files. It would emit
'No such file or directory' warning when an object consisting a module is
renamed, or when a single-obj module is turned into a multi-obj module or
vice versa.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
2019-07-18 02:19:31 +09:00

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#!/bin/sh
#
# Output a simple RPM spec file.
# This version assumes a minimum of RPM 4.0.3.
#
# The only gothic bit here is redefining install_post to avoid
# stripping the symbols from files in the kernel which we want
#
# Patched for non-x86 by Opencon (L) 2002 <opencon@rio.skydome.net>
#
# how we were called determines which rpms we build and how we build them
if [ "$1" = prebuilt ]; then
S=DEL
MAKE="$MAKE -f $srctree/Makefile"
else
S=
fi
if grep -q CONFIG_MODULES=y .config; then
M=
else
M=DEL
fi
if grep -q CONFIG_DRM=y .config; then
PROVIDES=kernel-drm
fi
PROVIDES="$PROVIDES kernel-$KERNELRELEASE"
__KERNELRELEASE=$(echo $KERNELRELEASE | sed -e "s/-/_/g")
EXCLUDES="$RCS_TAR_IGNORE --exclude=*vmlinux* --exclude=*.mod \
--exclude=*.o --exclude=*.ko --exclude=*.cmd --exclude=Documentation \
--exclude=.config.old --exclude=.missing-syscalls.d --exclude=*.s"
# We can label the here-doc lines for conditional output to the spec file
#
# Labels:
# $S: this line is enabled only when building source package
# $M: this line is enabled only when CONFIG_MODULES is enabled
sed -e '/^DEL/d' -e 's/^\t*//' <<EOF
Name: kernel
Summary: The Linux Kernel
Version: $__KERNELRELEASE
Release: $(cat .version 2>/dev/null || echo 1)
License: GPL
Group: System Environment/Kernel
Vendor: The Linux Community
URL: http://www.kernel.org
$S Source: kernel-$__KERNELRELEASE.tar.gz
Provides: $PROVIDES
%define __spec_install_post /usr/lib/rpm/brp-compress || :
%define debug_package %{nil}
%description
The Linux Kernel, the operating system core itself
%package headers
Summary: Header files for the Linux kernel for use by glibc
Group: Development/System
Obsoletes: kernel-headers
Provides: kernel-headers = %{version}
%description headers
Kernel-headers includes the C header files that specify the interface
between the Linux kernel and userspace libraries and programs. The
header files define structures and constants that are needed for
building most standard programs and are also needed for rebuilding the
glibc package.
$S$M %package devel
$S$M Summary: Development package for building kernel modules to match the $__KERNELRELEASE kernel
$S$M Group: System Environment/Kernel
$S$M AutoReqProv: no
$S$M %description -n kernel-devel
$S$M This package provides kernel headers and makefiles sufficient to build modules
$S$M against the $__KERNELRELEASE kernel package.
$S$M
$S %prep
$S %setup -q
$S
$S %build
$S $MAKE %{?_smp_mflags} KBUILD_BUILD_VERSION=%{release}
$S
%install
mkdir -p %{buildroot}/boot
%ifarch ia64
mkdir -p %{buildroot}/boot/efi
cp \$($MAKE image_name) %{buildroot}/boot/efi/vmlinuz-$KERNELRELEASE
ln -s efi/vmlinuz-$KERNELRELEASE %{buildroot}/boot/
%else
cp \$($MAKE image_name) %{buildroot}/boot/vmlinuz-$KERNELRELEASE
%endif
$M $MAKE %{?_smp_mflags} INSTALL_MOD_PATH=%{buildroot} modules_install
$MAKE %{?_smp_mflags} INSTALL_HDR_PATH=%{buildroot}/usr headers_install
cp System.map %{buildroot}/boot/System.map-$KERNELRELEASE
cp .config %{buildroot}/boot/config-$KERNELRELEASE
bzip2 -9 --keep vmlinux
mv vmlinux.bz2 %{buildroot}/boot/vmlinux-$KERNELRELEASE.bz2
$S$M rm -f %{buildroot}/lib/modules/$KERNELRELEASE/build
$S$M rm -f %{buildroot}/lib/modules/$KERNELRELEASE/source
$S$M mkdir -p %{buildroot}/usr/src/kernels/$KERNELRELEASE
$S$M tar cf - $EXCLUDES . | tar xf - -C %{buildroot}/usr/src/kernels/$KERNELRELEASE
$S$M cd %{buildroot}/lib/modules/$KERNELRELEASE
$S$M ln -sf /usr/src/kernels/$KERNELRELEASE build
$S$M ln -sf /usr/src/kernels/$KERNELRELEASE source
%clean
rm -rf %{buildroot}
%post
if [ -x /sbin/installkernel -a -r /boot/vmlinuz-$KERNELRELEASE -a -r /boot/System.map-$KERNELRELEASE ]; then
cp /boot/vmlinuz-$KERNELRELEASE /boot/.vmlinuz-$KERNELRELEASE-rpm
cp /boot/System.map-$KERNELRELEASE /boot/.System.map-$KERNELRELEASE-rpm
rm -f /boot/vmlinuz-$KERNELRELEASE /boot/System.map-$KERNELRELEASE
/sbin/installkernel $KERNELRELEASE /boot/.vmlinuz-$KERNELRELEASE-rpm /boot/.System.map-$KERNELRELEASE-rpm
rm -f /boot/.vmlinuz-$KERNELRELEASE-rpm /boot/.System.map-$KERNELRELEASE-rpm
fi
%preun
if [ -x /sbin/new-kernel-pkg ]; then
new-kernel-pkg --remove $KERNELRELEASE --rminitrd --initrdfile=/boot/initramfs-$KERNELRELEASE.img
elif [ -x /usr/bin/kernel-install ]; then
kernel-install remove $KERNELRELEASE
fi
%postun
if [ -x /sbin/update-bootloader ]; then
/sbin/update-bootloader --remove $KERNELRELEASE
fi
%files
%defattr (-, root, root)
$M /lib/modules/$KERNELRELEASE
$M %exclude /lib/modules/$KERNELRELEASE/build
$M %exclude /lib/modules/$KERNELRELEASE/source
/boot/*
%files headers
%defattr (-, root, root)
/usr/include
$S$M
$S$M %files devel
$S$M %defattr (-, root, root)
$S$M /usr/src/kernels/$KERNELRELEASE
$S$M /lib/modules/$KERNELRELEASE/build
$S$M /lib/modules/$KERNELRELEASE/source
EOF
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