1#!/bin/sh
  2#
  3# Copyright 2003 Wichert Akkerman <wichert@wiggy.net>
  4#
  5# Simple script to generate a debian/ directory for a Linux kernel.
  6
  7set -e
  8
  9set_debarch() {
 10	# Attempt to find the correct Debian architecture
 11	case "$UTS_MACHINE" in
 12	i386|ia64|alpha)
 13		debarch="$UTS_MACHINE" ;;
 14	x86_64)
 15		debarch=amd64 ;;
 16	sparc*)
 17		debarch=sparc ;;
 18	s390*)
 19		debarch=s390$(grep -q CONFIG_64BIT=y $KCONFIG_CONFIG && echo x || true) ;;
 20	ppc*)
 21		debarch=$(grep -q CPU_LITTLE_ENDIAN=y $KCONFIG_CONFIG && echo ppc64el || echo powerpc) ;;
 22	parisc*)
 23		debarch=hppa ;;
 24	mips*)
 25		debarch=mips$(grep -q CPU_LITTLE_ENDIAN=y $KCONFIG_CONFIG && echo el || true) ;;
 26	aarch64|arm64)
 27		debarch=arm64 ;;
 28	arm*)
 29		if grep -q CONFIG_AEABI=y $KCONFIG_CONFIG; then
 30		    if grep -q CONFIG_VFP=y $KCONFIG_CONFIG; then
 31			debarch=armhf
 32		    else
 33			debarch=armel
 34		    fi
 35		else
 36		    debarch=arm
 37		fi
 38		;;
 39	*)
 40		debarch=$(dpkg --print-architecture)
 41		echo "" >&2
 42		echo "** ** **  WARNING  ** ** **" >&2
 43		echo "" >&2
 44		echo "Your architecture doesn't have its equivalent" >&2
 45		echo "Debian userspace architecture defined!" >&2
 46		echo "Falling back to using your current userspace instead!" >&2
 47		echo "Please add support for $UTS_MACHINE to ${0} ..." >&2
 48		echo "" >&2
 49	esac
 50	if [ -n "$KBUILD_DEBARCH" ] ; then
 51		debarch="$KBUILD_DEBARCH"
 52	fi
 53}
 54
 55# Some variables and settings used throughout the script
 56version=$KERNELRELEASE
 57if [ -n "$KDEB_PKGVERSION" ]; then
 58	packageversion=$KDEB_PKGVERSION
 59else
 60	revision=$(cat .version 2>/dev/null||echo 1)
 61	packageversion=$version-$revision
 62fi
 63sourcename=$KDEB_SOURCENAME
 64packagename=linux-image-$version
 65kernel_headers_packagename=linux-headers-$version
 66dbg_packagename=$packagename-dbg
 67debarch=
 68set_debarch
 69
 70if [ "$ARCH" = "um" ] ; then
 71	packagename=user-mode-linux-$version
 72fi
 73
 74# Try to determine maintainer and email values
 75if [ -n "$DEBEMAIL" ]; then
 76       email=$DEBEMAIL
 77elif [ -n "$EMAIL" ]; then
 78       email=$EMAIL
 79else
 80       email=$(id -nu)@$(hostname -f 2>/dev/null || hostname)
 81fi
 82if [ -n "$DEBFULLNAME" ]; then
 83       name=$DEBFULLNAME
 84elif [ -n "$NAME" ]; then
 85       name=$NAME
 86else
 87       name="Anonymous"
 88fi
 89maintainer="$name <$email>"
 90
 91# Try to determine distribution
 92if [ -n "$KDEB_CHANGELOG_DIST" ]; then
 93        distribution=$KDEB_CHANGELOG_DIST
 94# In some cases lsb_release returns the codename as n/a, which breaks dpkg-parsechangelog
 95elif distribution=$(lsb_release -cs 2>/dev/null) && [ -n "$distribution" ] && [ "$distribution" != "n/a" ]; then
 96        : # nothing to do in this case
 97else
 98        distribution="unstable"
 99        echo >&2 "Using default distribution of 'unstable' in the changelog"
100        echo >&2 "Install lsb-release or set \$KDEB_CHANGELOG_DIST explicitly"
101fi
102
103mkdir -p debian/
104echo $debarch > debian/arch
105
106# Generate a simple changelog template
107cat <<EOF > debian/changelog
108$sourcename ($packageversion) $distribution; urgency=low
109
110  * Custom built Linux kernel.
111
112 -- $maintainer  $(date -R)
113EOF
114
115# Generate copyright file
116cat <<EOF > debian/copyright
117This is a packacked upstream version of the Linux kernel.
118
119The sources may be found at most Linux archive sites, including:
120https://www.kernel.org/pub/linux/kernel
121
122Copyright: 1991 - 2018 Linus Torvalds and others.
123
124The git repository for mainline kernel development is at:
125git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
126
127    This program is free software; you can redistribute it and/or modify
128    it under the terms of the GNU General Public License as published by
129    the Free Software Foundation; version 2 dated June, 1991.
130
131On Debian GNU/Linux systems, the complete text of the GNU General Public
132License version 2 can be found in \`/usr/share/common-licenses/GPL-2'.
133EOF
134
135# Generate a control file
136cat <<EOF > debian/control
137Source: $sourcename
138Section: kernel
139Priority: optional
140Maintainer: $maintainer
141Build-Depends: bc, kmod, cpio
142Homepage: http://www.kernel.org/
143
144Package: $packagename
145Architecture: $debarch
146Description: Linux kernel, version $version
147 This package contains the Linux kernel, modules and corresponding other
148 files, version: $version.
149
150Package: $kernel_headers_packagename
151Architecture: $debarch
152Description: Linux kernel headers for $version on $debarch
153 This package provides kernel header files for $version on $debarch
154 .
155 This is useful for people who need to build external modules
156
157Package: linux-libc-dev
158Section: devel
159Provides: linux-kernel-headers
160Architecture: $debarch
161Description: Linux support headers for userspace development
162 This package provides userspaces headers from the Linux kernel.  These headers
163 are used by the installed headers for GNU glibc and other system libraries.
164
165Package: $dbg_packagename
166Section: debug
167Architecture: $debarch
168Description: Linux kernel debugging symbols for $version
169 This package will come in handy if you need to debug the kernel. It provides
170 all the necessary debug symbols for the kernel and its modules.
171EOF
172
173cat <<EOF > debian/rules
174#!$(command -v $MAKE) -f
175
176build:
177	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} KBUILD_SRC=
178
179binary-arch:
180	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} KBUILD_SRC= intdeb-pkg
181
182clean:
183	rm -rf debian/*tmp debian/files
184	\$(MAKE) clean
185
186binary: binary-arch
187EOF
188
189exit 0