82a1978d0f
The 'cpio' command is used solely for copying header files to the
temporary directory. However, there is no strong reason to use 'cpio'
for this purpose. For example, scripts/package/install-extmod-build
uses the 'tar' command to copy files.
This commit replaces the use of 'cpio' with 'tar' because 'tar' is
already used in this script to generate kheaders_data.tar.xz anyway.
Performance-wide, there is no significant difference between 'cpio'
and 'tar'.
[Before]
$ rm -fr kheaders; mkdir kheaders
$ time sh -c '
for f in include arch/x86/include
do
find "$f" -name "*.h"
done | cpio --quiet -pd kheaders
'
real 0m0.148s
user 0m0.021s
sys 0m0.140s
[After]
$ rm -fr kheaders; mkdir kheaders
$ time sh -c '
for f in include arch/x86/include
do
find "$f" -name "*.h"
done | tar -c -f - -T - | tar -xf - -C kheaders
'
real 0m0.098s
user 0m0.024s
sys 0m0.131s
Revert commit 69ef0920bd ("Docs: Add cpio requirement to changes.rst")
because 'cpio' is not used anywhere else during the kernel build.
Please note that the built-in initramfs is created by the in-tree tool,
usr/gen_init_cpio, so it does not rely on the external 'cpio' command
at all.
Remove 'cpio' from the package build dependencies as well.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
270 lines
6.4 KiB
Bash
Executable file
270 lines
6.4 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright 2003 Wichert Akkerman <wichert@wiggy.net>
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#
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# Simple script to generate a debian/ directory for a Linux kernel.
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set -eu
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is_enabled() {
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grep -q "^$1=y" include/config/auto.conf
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}
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if_enabled_echo() {
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if is_enabled "$1"; then
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echo -n "$2"
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elif [ $# -ge 3 ]; then
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echo -n "$3"
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fi
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}
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set_debarch() {
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if [ "${KBUILD_DEBARCH:+set}" ]; then
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debarch="$KBUILD_DEBARCH"
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return
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fi
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# Attempt to find the correct Debian architecture
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case "$UTS_MACHINE" in
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i386|alpha|m68k|riscv*)
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debarch="$UTS_MACHINE" ;;
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x86_64)
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debarch=amd64 ;;
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sparc*)
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debarch=sparc$(if_enabled_echo CONFIG_64BIT 64) ;;
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s390*)
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debarch=s390x ;;
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ppc*)
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if is_enabled CONFIG_64BIT; then
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debarch=ppc64$(if_enabled_echo CONFIG_CPU_LITTLE_ENDIAN el)
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else
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debarch=powerpc$(if_enabled_echo CONFIG_SPE spe)
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fi
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;;
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parisc*)
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debarch=hppa ;;
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mips*)
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if is_enabled CONFIG_CPU_LITTLE_ENDIAN; then
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debarch=mips$(if_enabled_echo CONFIG_64BIT 64)$(if_enabled_echo CONFIG_CPU_MIPSR6 r6)el
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elif is_enabled CONFIG_CPU_MIPSR6; then
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debarch=mips$(if_enabled_echo CONFIG_64BIT 64)r6
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else
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debarch=mips
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fi
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;;
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aarch64|arm64)
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debarch=arm64 ;;
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arm*)
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if is_enabled CONFIG_AEABI; then
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debarch=arm$(if_enabled_echo CONFIG_VFP hf el)
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else
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debarch=arm
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fi
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;;
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openrisc)
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debarch=or1k ;;
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sh)
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if is_enabled CONFIG_CPU_SH3; then
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debarch=sh3$(if_enabled_echo CONFIG_CPU_BIG_ENDIAN eb)
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elif is_enabled CONFIG_CPU_SH4; then
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debarch=sh4$(if_enabled_echo CONFIG_CPU_BIG_ENDIAN eb)
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fi
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;;
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um)
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if is_enabled CONFIG_64BIT; then
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debarch=amd64
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else
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debarch=i386
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fi
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;;
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esac
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if [ -z "$debarch" ]; then
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debarch=$(dpkg-architecture -qDEB_HOST_ARCH)
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echo "" >&2
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echo "** ** ** WARNING ** ** **" >&2
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echo "" >&2
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echo "Your architecture doesn't have its equivalent" >&2
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echo "Debian userspace architecture defined!" >&2
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echo "Falling back to the current host architecture ($debarch)." >&2
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echo "Please add support for $UTS_MACHINE to ${0} ..." >&2
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echo "" >&2
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fi
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}
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# Create debian/source/ if it is a source package build
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gen_source ()
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{
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mkdir -p debian/source
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echo "3.0 (quilt)" > debian/source/format
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{
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echo "diff-ignore"
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echo "extend-diff-ignore = .*"
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} > debian/source/local-options
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# Add .config as a patch
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mkdir -p debian/patches
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{
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echo "Subject: Add .config"
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echo "Author: ${maintainer}"
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echo
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echo "--- /dev/null"
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echo "+++ linux/.config"
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diff -u /dev/null "${KCONFIG_CONFIG}" | tail -n +3
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} > debian/patches/config.patch
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echo config.patch > debian/patches/series
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"${srctree}/scripts/package/gen-diff-patch" debian/patches/diff.patch
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if [ -s debian/patches/diff.patch ]; then
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sed -i "
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1iSubject: Add local diff
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1iAuthor: ${maintainer}
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1i
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" debian/patches/diff.patch
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echo diff.patch >> debian/patches/series
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else
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rm -f debian/patches/diff.patch
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fi
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}
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rm -rf debian
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mkdir debian
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user=${KBUILD_BUILD_USER:-$(id -nu)}
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name=${DEBFULLNAME:-${user}}
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if [ "${DEBEMAIL:+set}" ]; then
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email=${DEBEMAIL}
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else
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buildhost=${KBUILD_BUILD_HOST:-$(hostname -f 2>/dev/null || hostname)}
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email="${user}@${buildhost}"
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fi
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maintainer="${name} <${email}>"
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while [ $# -gt 0 ]; do
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case "$1" in
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--need-source)
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gen_source
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shift
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;;
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*)
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break
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;;
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esac
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done
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# Some variables and settings used throughout the script
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version=$KERNELRELEASE
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if [ "${KDEB_PKGVERSION:+set}" ]; then
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packageversion=$KDEB_PKGVERSION
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else
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packageversion=$(${srctree}/scripts/setlocalversion --no-local ${srctree})-$($srctree/scripts/build-version)
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fi
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sourcename=${KDEB_SOURCENAME:-linux-upstream}
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if [ "$ARCH" = "um" ] ; then
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packagename=user-mode-linux
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else
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packagename=linux-image
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fi
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debarch=
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set_debarch
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# Try to determine distribution
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if [ "${KDEB_CHANGELOG_DIST:+set}" ]; then
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distribution=$KDEB_CHANGELOG_DIST
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# In some cases lsb_release returns the codename as n/a, which breaks dpkg-parsechangelog
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elif distribution=$(lsb_release -cs 2>/dev/null) && [ -n "$distribution" ] && [ "$distribution" != "n/a" ]; then
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: # nothing to do in this case
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else
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distribution="unstable"
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echo >&2 "Using default distribution of 'unstable' in the changelog"
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echo >&2 "Install lsb-release or set \$KDEB_CHANGELOG_DIST explicitly"
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fi
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echo $debarch > debian/arch
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host_gnu=$(dpkg-architecture -a "${debarch}" -q DEB_HOST_GNU_TYPE | sed 's/_/-/g')
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# Generate a simple changelog template
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cat <<EOF > debian/changelog
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$sourcename ($packageversion) $distribution; urgency=low
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* Custom built Linux kernel.
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-- $maintainer $(date -R)
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EOF
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# Generate a control file
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cat <<EOF > debian/control
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Source: $sourcename
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Section: kernel
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Priority: optional
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Maintainer: $maintainer
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Rules-Requires-Root: no
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Build-Depends: debhelper-compat (= 12)
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Build-Depends-Arch: bc, bison, flex,
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gcc-${host_gnu} <!pkg.${sourcename}.nokernelheaders>,
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kmod, libelf-dev:native,
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libssl-dev:native, libssl-dev <!pkg.${sourcename}.nokernelheaders>,
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python3:native, rsync
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Homepage: https://www.kernel.org/
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Package: $packagename-$version
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Architecture: $debarch
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Description: Linux kernel, version $version
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This package contains the Linux kernel, modules and corresponding other
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files, version: $version.
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EOF
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if [ "${SRCARCH}" != um ]; then
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cat <<EOF >> debian/control
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Package: linux-libc-dev
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Section: devel
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Provides: linux-kernel-headers
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Architecture: $debarch
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Description: Linux support headers for userspace development
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This package provides userspaces headers from the Linux kernel. These headers
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are used by the installed headers for GNU glibc and other system libraries.
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Multi-Arch: same
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EOF
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if is_enabled CONFIG_MODULES; then
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cat <<EOF >> debian/control
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Package: linux-headers-$version
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Architecture: $debarch
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Build-Profiles: <!pkg.${sourcename}.nokernelheaders>
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Description: Linux kernel headers for $version on $debarch
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This package provides kernel header files for $version on $debarch
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.
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This is useful for people who need to build external modules
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EOF
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fi
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fi
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if is_enabled CONFIG_DEBUG_INFO; then
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cat <<EOF >> debian/control
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Package: linux-image-$version-dbg
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Section: debug
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Architecture: $debarch
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Build-Profiles: <!pkg.${sourcename}.nokerneldbg>
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Description: Linux kernel debugging symbols for $version
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This package will come in handy if you need to debug the kernel. It provides
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all the necessary debug symbols for the kernel and its modules.
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EOF
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fi
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cat <<EOF > debian/rules.vars
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ARCH := ${ARCH}
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KERNELRELEASE := ${KERNELRELEASE}
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EOF
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cp "${srctree}/scripts/package/debian/copyright" debian/
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cp "${srctree}/scripts/package/debian/rules" debian/
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exit 0
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