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
9is_enabled() {
10	grep -q "^$1=y" include/config/auto.conf
11}
12
13if_enabled_echo() {
14	if is_enabled "$1"; then
15		echo -n "$2"
16	elif [ $# -ge 3 ]; then
17		echo -n "$3"
18	fi
19}
20
21set_debarch() {
22	if [ -n "$KBUILD_DEBARCH" ] ; then
23		debarch="$KBUILD_DEBARCH"
24		return
25	fi
26
27	# Attempt to find the correct Debian architecture
28	case "$UTS_MACHINE" in
29	i386|ia64|alpha|m68k|riscv*)
30		debarch="$UTS_MACHINE" ;;
31	x86_64)
32		debarch=amd64 ;;
33	sparc*)
34		debarch=sparc$(if_enabled_echo CONFIG_64BIT 64) ;;
35	s390*)
36		debarch=s390x ;;
37	ppc*)
38		if is_enabled CONFIG_64BIT; then
39			debarch=ppc64$(if_enabled_echo CONFIG_CPU_LITTLE_ENDIAN el)
40		else
41			debarch=powerpc$(if_enabled_echo CONFIG_SPE spe)
42		fi
43		;;
44	parisc*)
45		debarch=hppa ;;
46	mips*)
47		if is_enabled CONFIG_CPU_LITTLE_ENDIAN; then
48			debarch=mips$(if_enabled_echo CONFIG_64BIT 64)$(if_enabled_echo CONFIG_CPU_MIPSR6 r6)el
49		elif is_enabled CONFIG_CPU_MIPSR6; then
50			debarch=mips$(if_enabled_echo CONFIG_64BIT 64)r6
51		else
52			debarch=mips
53		fi
54		;;
55	aarch64|arm64)
56		debarch=arm64 ;;
57	arm*)
58		if is_enabled CONFIG_AEABI; then
59			debarch=arm$(if_enabled_echo CONFIG_VFP hf el)
60		else
61			debarch=arm
62		fi
63		;;
64	openrisc)
65		debarch=or1k ;;
66	sh)
67		if is_enabled CONFIG_CPU_SH3; then
68			debarch=sh3$(if_enabled_echo CONFIG_CPU_BIG_ENDIAN eb)
69		elif is_enabled CONFIG_CPU_SH4; then
70			debarch=sh4$(if_enabled_echo CONFIG_CPU_BIG_ENDIAN eb)
71		fi
72		;;
73	esac
74	if [ -z "$debarch" ]; then
75		debarch=$(dpkg-architecture -qDEB_HOST_ARCH)
76		echo "" >&2
77		echo "** ** **  WARNING  ** ** **" >&2
78		echo "" >&2
79		echo "Your architecture doesn't have its equivalent" >&2
80		echo "Debian userspace architecture defined!" >&2
81		echo "Falling back to the current host architecture ($debarch)." >&2
82		echo "Please add support for $UTS_MACHINE to ${0} ..." >&2
83		echo "" >&2
84	fi
85}
86
87rm -rf debian
88
89# Some variables and settings used throughout the script
90version=$KERNELRELEASE
91if [ -n "$KDEB_PKGVERSION" ]; then
92	packageversion=$KDEB_PKGVERSION
93else
94	packageversion=$version-$($srctree/init/build-version)
95fi
96sourcename=${KDEB_SOURCENAME:-linux-upstream}
97
98if [ "$ARCH" = "um" ] ; then
99	packagename=user-mode-linux
100else
101	packagename=linux-image
102fi
103
104debarch=
105set_debarch
106
107email=${DEBEMAIL-$EMAIL}
108
109# use email string directly if it contains <email>
110if echo $email | grep -q '<.*>'; then
111	maintainer=$email
112else
113	# or construct the maintainer string
114	user=${KBUILD_BUILD_USER-$(id -nu)}
115	name=${DEBFULLNAME-$user}
116	if [ -z "$email" ]; then
117		buildhost=${KBUILD_BUILD_HOST-$(hostname -f 2>/dev/null || hostname)}
118		email="$user@$buildhost"
119	fi
120	maintainer="$name <$email>"
121fi
122
123# Try to determine distribution
124if [ -n "$KDEB_CHANGELOG_DIST" ]; then
125        distribution=$KDEB_CHANGELOG_DIST
126# In some cases lsb_release returns the codename as n/a, which breaks dpkg-parsechangelog
127elif distribution=$(lsb_release -cs 2>/dev/null) && [ -n "$distribution" ] && [ "$distribution" != "n/a" ]; then
128        : # nothing to do in this case
129else
130        distribution="unstable"
131        echo >&2 "Using default distribution of 'unstable' in the changelog"
132        echo >&2 "Install lsb-release or set \$KDEB_CHANGELOG_DIST explicitly"
133fi
134
135mkdir -p debian/source/
136echo "3.0 (quilt)" > debian/source/format
137
138{
139	echo "diff-ignore"
140	echo "extend-diff-ignore = .*"
141} > debian/source/local-options
142
143# Add .config as a patch
144mkdir -p debian/patches
145{
146	echo "Subject: Add .config"
147	echo "Author: ${maintainer}"
148	echo
149	echo "--- /dev/null"
150	echo "+++ linux/.config"
151	diff -u /dev/null "${KCONFIG_CONFIG}" | tail -n +3
152} > debian/patches/config
153echo config > debian/patches/series
154
155echo $debarch > debian/arch
156extra_build_depends=", $(if_enabled_echo CONFIG_UNWINDER_ORC libelf-dev:native)"
157extra_build_depends="$extra_build_depends, $(if_enabled_echo CONFIG_SYSTEM_TRUSTED_KEYRING libssl-dev:native)"
158
159# Generate a simple changelog template
160cat <<EOF > debian/changelog
161$sourcename ($packageversion) $distribution; urgency=low
162
163  * Custom built Linux kernel.
164
165 -- $maintainer  $(date -R)
166EOF
167
168# Generate copyright file
169cat <<EOF > debian/copyright
170This is a packacked upstream version of the Linux kernel.
171
172The sources may be found at most Linux archive sites, including:
173https://www.kernel.org/pub/linux/kernel
174
175Copyright: 1991 - 2018 Linus Torvalds and others.
176
177The git repository for mainline kernel development is at:
178git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
179
180    This program is free software; you can redistribute it and/or modify
181    it under the terms of the GNU General Public License as published by
182    the Free Software Foundation; version 2 dated June, 1991.
183
184On Debian GNU/Linux systems, the complete text of the GNU General Public
185License version 2 can be found in \`/usr/share/common-licenses/GPL-2'.
186EOF
187
188# Generate a control file
189cat <<EOF > debian/control
190Source: $sourcename
191Section: kernel
192Priority: optional
193Maintainer: $maintainer
194Rules-Requires-Root: no
195Build-Depends: bc, rsync, kmod, cpio, bison, flex $extra_build_depends
196Homepage: https://www.kernel.org/
197
198Package: $packagename-$version
199Architecture: $debarch
200Description: Linux kernel, version $version
201 This package contains the Linux kernel, modules and corresponding other
202 files, version: $version.
203
204Package: linux-libc-dev
205Section: devel
206Provides: linux-kernel-headers
207Architecture: $debarch
208Description: Linux support headers for userspace development
209 This package provides userspaces headers from the Linux kernel.  These headers
210 are used by the installed headers for GNU glibc and other system libraries.
211Multi-Arch: same
212EOF
213
214if is_enabled CONFIG_MODULES; then
215cat <<EOF >> debian/control
216
217Package: linux-headers-$version
218Architecture: $debarch
219Description: Linux kernel headers for $version on $debarch
220 This package provides kernel header files for $version on $debarch
221 .
222 This is useful for people who need to build external modules
223EOF
224fi
225
226if is_enabled CONFIG_DEBUG_INFO; then
227cat <<EOF >> debian/control
228
229Package: linux-image-$version-dbg
230Section: debug
231Architecture: $debarch
232Description: Linux kernel debugging symbols for $version
233 This package will come in handy if you need to debug the kernel. It provides
234 all the necessary debug symbols for the kernel and its modules.
235EOF
236fi
237
238cat <<EOF > debian/rules
239#!$(command -v $MAKE) -f
240
241srctree ?= .
242
243build-indep:
244build-arch:
245	\$(MAKE) -f \$(srctree)/Makefile ARCH=${ARCH} \
246	\$(shell \$(srctree)/scripts/package/deb-build-option) \
247	olddefconfig all
248
249build: build-arch
250
251binary-indep:
252binary-arch: build-arch
253	\$(MAKE) -f \$(srctree)/Makefile ARCH=${ARCH} intdeb-pkg
254clean:
255	rm -rf debian/files debian/linux-*
256	\$(MAKE) -f \$(srctree)/Makefile ARCH=${ARCH} clean
257
258binary: binary-arch
259EOF
260chmod +x debian/rules
261
262exit 0
263