english/kernel-package/make-kpkg.8

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.\" Copyright (c) 1997 Manoj Srivastava <srivasta@debian.org>
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.\"    $Id: make-kpkg.8,v 1.75 2003/07/30 22:28:52 srivasta Exp $
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.TH MAKE\-KPKG 1 "Nov 14 2002" "Debian" "Debian GNU/Linux manual"
.SH NAME
make\-kpkg \- build Debian kernel packages from Linux kernel sources
.SH SYNOPSIS
.B make\-kpkg
.I [options]
\&[target [target ...]]
.SH DESCRIPTION
This manual page explains the Debian
.B "make\-kpkg"
utility, which is used to create the kernel related 
Debian 
packages. This utility needs to be run from a top level 
Linux
kernel source directory,
which has been previously configured (unless you are using the
configure target). Typycally, you run this command as root, or under
.B fakeroot,
or tell 
.B make\-kpkg
how to become root, like so:
.sp 1
.ti +5
make\-kpkg --rootcmd fakeroot kernel_image
.sp 1
The Debian package file is created in the parent directory of the
kernel source directory where this command is run.
.SH OPTIONS
.B \-\-help
Print out a usage message.
.TP
.BR \-\-revision " number"
Changes the Debian revision number for the packages produced to the argument
.BR number.
This has certain constraints: the --revision option only has an effect
during the configure phase (in other words, if a file called
.I stamp\-configure
exists, this option has no effect \-\- run 
.B make\-kpkg clean 
or manually remove
.I stamp\-configure 
and 
.I stamp-debian
for it to have an effect -- I strongly suggest you run
.B make\-kpkg clean 
unless you know what you are doing). 
Additionally, official source package maintainers provide their own
version numbers and data for the official uploads, and hence a number
of things, including the
.B Debian
revision, is not modified by
.B make-kpkg.
If you happen to have an official source, (that would mean that the
file 
.I debian/official
exists, and is not empty), and want to use your own revision number,
make sure you remove
.I debian/official
before running  
.B make\-kpkg clean 
for this option to have an effect.
So, if you want to re\-run 
.B make\-kpkg 
with a different revision number, you have to make sure you start with
a clean slate.  Secondly, the version may contain only 
alphanumerics and the characters + . (full stop and plus)
and must contain a digit. (Look at the Policy manual for
details). 
.I Actually, that is a lie: official kernel and modules maintainers
have special dispensation to use hyphens, but it is strongly
deprecated for most people, since no sanitization of the version
number is done, and dpkg and friends may choke on it at the end of the
compile unless one knows what one is doing. 
Optionally, you may prepend the revision with a digit followed by a
colon (:). The default is
.B 1.00.Custom
unless the environment variable
.B DEBIAN_REVISION_MANDATORY
is set, in which case an error is generated if the revision is not set
on the command line or the configuration file.
.TP
.BR \-\-append-to-version " foo"
.TP
.BR \-\-append_to_version " foo"
This argument (
.B foo
) is appended to the value of the  EXTRAVERSION variable present in
the kernel Makefile. Since EXTRAVERSION is a component of the kernel
version, it is also added to the Debian package name, and, as such
must obey the policy governing the package name. That means it may
contain only 
.B  lowercase
alphanumerics and the characters - + . (full stop, hyphen, and
plus). Uppercase letters are not permitted under the Policy for a new
package.  This over rides the environment variable
.B APPEND_TO_VERSION
Please  note  that you \fB\s-1must\s0\fR run a 
.B make-kpkg 
.I clean
after configuring the kernel using 
.I make (x|menu)?config, 
since that creates the file
.I include/linux/version.h
.B without 
the 
.I append_to_version
data (foo). This file won't be updated by the make-kpkg run (make-kpkg
creates version.h if it doesn't exist, but doesn't touch if exists),
so the final kernel will _not_ have the append_to_version data in its
version number it shall look for the modules and symbols in all the
wrong places. The simplest solution is either to remove
include/linux/version.h after configuring and before compiling, or
running 
.B make-kpkg clean
after configuring, before compiling.
.B Note
also that once you use 
.BR \-\-append_to_version " foo"
for configuring, or building the kernel-image, you need to also use
the same option in any later invocation of make-kpkg (say, for
building stand alone modules, or something).  
.B make\-kpkg
does not remember the argument foo in between invocations (this is
different from the behavior of --revision, which we do remember in
between invocations). If you are annoyed by make-kpkg whining about
using 
.BR \-\-append_to_version 
and there already being a 
.T version.h
file from before, you can set the environment variable
.B VERSION_H_OK
which shall shut off the warning.
.TP
.BR \-\-flavour\ foo
This option is now deprecated in favor of 
.BR \-\-append_to_version.
Sets the kernel flavour to the argument \fBfoo\fR. The flavour is
also appended to the package name. You need a patched Makefile to make
this work properly (see /usr/share/doc/kernel-package/\s-1Flavours\s0.gz).
It may contain only 
.B lowercase
alphanumerics and the characters \- + . (full stop, hyphen, and
plus). Uppercase letter are not permitted under the Policy for a new
package. \fB\s-1NOTE\s0\fR: Hyphens are discouraged.  (Look at
Chapters 4 of the Policy manual for details). Please note that you
shall need to
.B make-kpkg 
.I clean
.B FIRST
if you wish to recompile the kernel-image using a flavour.
.TP
.BR \-\-added-modules\ foo
.TP
.BR \-\-added_modules\ foo
The argument should be a comma separated list of additional
add-on modules (not in the main kernel tree) that you wish to
build when you invoke the modules_blah targets. You may give full path
names of the directory the modules 
reside in, or just the module name if it can be found in 
.B MODULE_LOC,
which defaults to 
.I /usr/src/modules.
The default is that all modules in
.B MODULE_LOC,
are compiled when the modules_blah targets are invoked.
.TP
.BR \-\-added-patches\ foo
.TP
.BR \-\-added_patches\ foo
The argument should be a comma separated list of additional
patches to the kernel sources. This automatically sets the 
.I patch_the_kernel
configuration option to YES. 
.IP
Unlike the treatment of the modules, you may only give the patch file
basename (not the full path name of the patch file).  For each file
<patch_name> in the list, the following process is followed: If
the file can be found in the directories
.B ALL_PATCH_DIR/{apply,unpatch}/,
then the file
.B ALL_PATCH_DIR/apply/<patch_name>
shall be executed in turn during the configure phase (and presumably
this applies the patch). Correspondingly, the file
.B ALL_PATCH_DIR/unpatch/<patch_name> 
shall be executed in the clean phase.  
The default is that all patches are applied by running all the
executable files in 
.B ALL_PATCH_DIR/apply/
if requested (Either by setting the configuration option
.B patch_the_kernel
or the environment variable 
.B PATCH_THE_KERNEL
to YES).  Please note that the patches are UN-installed from the source
when you run the clean target.  This cleanup can be prevented by
setting the environment variable 
.B NO_UNPATCH_BY_DEFAULT
.IP
In the above, 
.B ALL_PATCH_DIR
defaults to a subdirectory of
.I /usr/src/kernel-patches/.
.IP
Some times it would be convenient to have the patches applied when
one asks for specific patches using this option, without also having
to explicitly set the environment variable. Since setting the
environment variable 
.B PATCH_THE_KERNEL
to YES could be dangerous, (for in that case all patches may be
installed when you want none, and did not specify the added_patches
option), You may also set the variable PATCH_THE_KERNEL to
.I AUTO,
in which case PATCH_THE_KERNEL shall be set to YES for you when you 
invoke 
.BR \-\-added-patches\ foo, 
but not otherwise.  
Also, please note that if any patch installs a script in 
.I ./debian/image.d/
directory, 
.B run-parts 
shall be called on that directory just before the kernel image package is
built. The location of the root of the image package being built shall
be passed in the environment variable 
.B IMAGE_TOP,
and the kernel versions is passed in through the environment variable
.B version.
This is a way for the patch to insert any additional files into
the image, for example.
.TP
.BR \-\-arch\ foo
This is useful for setting the architecture when you are cross
compiling. If you are not cross compiling, the architecture is
determined automatically. The same effect can be achieved by setting
the environment variable
.B KPKG_ARCH
.TP
.BR \-\-cross-compile\ foo
.TP
.BR \-\-cross_compile\ foo
This is useful for setting the target string when you are cross
compiling. The same effect can be achieved by setting the environment variable
.B CROSS_COMPILE
.TP
.BR \-\-subarch\ foo
Some architectures (the Alpha, and the m68k) require a different
kernel for each sub-architecture. This option provides a way of
specifying it as an argument to \fBmake-kpkg\fR. \fBPlease note\fR
that additional support for sub-architectures may be required in the
kernel sources to actually make this do anything. The same effect can
be achieved by setting the environment variable 
.B KPKG_SUBARCH
.TP
.BR \-\-arch-in-name
.TP
.BR \-\-arch_in_name
This option uses an extended name for the kernel image package by
embedding the sub-architecture in the image name, so one could write a
script to create multiple sub-architectures one after the other. You
may also do this by setting the environment variable
.B ARCH_IN_NAME. 
\fBPlease note\fR that only the package
.I name
is affected, not modules locations etc.
.TP
.BR \-\-pgpsign " name"
Set the string used to sign the 
.B changes 
file for any external modules in 
.IR /usr/src/modules/
using PGP. This option will override the builtin default and the site
wide customizations stored in the file
.IR /etc/kernel-pkg.conf
or
.IR ~/.kernel-pkg.conf.
.TP
.BR \-\-config " target"
Change the type of configure done from the default \f(CWoldconfig\fR.
\fItarget\fR must be one of \f(CWoldconfig\fR, \f(CWconfig\fR, \f(CWmenuconfig\fR,
\f(CWxconfig\fR; or \f(CWold\fR, \f(CWmenu\fR, or \f(CWx\fR.
.Sp
This option is particularly useful when using \s-1PATCH_THE_KERNEL\s0 if some
of the patches change what configuration options are available. 
.B Note
however that 
.BR make\-kpkg
scans the config file at startup for some options, notably the fact
that modules are enabled or not, so toggling the status during the
delayed configuration results in an error. If needed, created the
configuration file as close to the desired one before calling
make\-kpkg with this switch.
.TP
.B \-\-targets
Prints out a list of known targets. See the Section
.B Targets 
below.
.TP
.B \-\-noexec
Pass a 
.B \-n
option to the 
.I make
process so that commands are merely printed to the screen but not actually
executed. This is very useful for debugging.
.TP 
.B \-\-initrd
If 
.B make\-kpkg 
is generating a 
.I kernel-image 
package, perform any actions
necessary for a kernel loaded using 
.B initrd.  
.B NOTE:
this requires a non-standard cramfs initrd patch to the kernel
sources, (unless the mkintrd configuration has been modified not to
use cramfs) or may result in a unbootable kernel. The patch is
generally present in the kernel sources shipped by Debian, but is not
present in pristine kernel sources.  This option may include extra
dependencies, and modifications to maintainer scripts.  It has no
effect when
.B make\-kpkg is not making a 
.I kernel-image 
package. The same effect can be achieved by setting the environment
variable
.B INITRD
to any non empty value.
To avoid a warning at install time, please read kernel-img.conf(5),
and add a 
.I warn_initrd 
directive in that file. To avoid the warning ar compile time, please
set the environment variable 
.B INITRD_OK.
.TP
.B \-\-zimage
Makes a zImage kernel rather than a bzImage kernel (the default).
Useful for people having problems with bzImage kernels. 
.TP
.B \-\-bzimage
Makes a bzImage kernel. Useful for people who want a bzImage kernel on
sites where the default is zImage kernels. 
.TP
.B \-\-rootcmd foo
The command that provides a means of gaining super user access (for
example, `sudo' or `fakeroot') as needed by dpkg-buildpackage's -r
option. 
.TP
.B \-\-us
This option is passed to dpkg-buildpackage, and directs that package
not to sign the source. This is only relevant for the buildpackage
target.  
.TP
.B \-\-uc
This option is passed to dpkg-buildpackage, and directs that package
not to sign the changelog. This is only relevant for the buildpackage
target.  
.PP
The options maybe shortened to the smallest unique string, and may
be entered with either a \- or a \-\- prefix, and you may use a space
or an = symbol between an option string and a value. You may also use
the form option=value; for details these and other variant forms
supported, please read man Getopt::Long (3perl).
.SH TARGETS
.TP
.B clean
Cleans the kernel source directory of all files created by target
.B build,
and runs a make distclean. (Please look at a Linux kernel Makefile for
details).  Please note that although we take care of the list of
current kernel configuration contained in the file
.I .config,
the file 
.I include/linux/autoconf.h
is not preserved.
.TP
.B buildpackage
This target runs the targets 
.B clean, 
and
.B binary,
and produces the complete package using 
.B dpkg-buildpackage
.TP
.B binary
This target produces all four Debian kernel packages by running the
targets
.B kernel_source, kernel_headers, kernel_doc
and
.B kernel_image.
.TP
.B kernel_source
This target produces a debianised package of the Linux kernel sources.
If the environment variable 
.B SOURCE_CLEAN_HOOK
points to an executable, then that executable shall be run from the
temporary (top) directory of the kernel sources just before packaging it,
.I ./debian/tmp-source/usr/src/kernel-source-X.X.XX,
so people may take any action they see fit (remove arch trees, prune
version control directories, 
.I find . \-type d \-name CVS \-prune \-exec rm \-rf {} \\;
etc). This has no effect on anything
other than the kernel sources that are being packaged -- if the script
operates on the current directory and its children, the original
source tree should remain intact. The environment variables
.B HEADER_CLEAN_HOOK
and
.B DOC_CLEAN_HOOK
are similiar. The should point tp executables, then that executable
shall be run from the temporary (top) directory of the kernel headers
and coumentation just before packaging respectively, so people may
take any action they see fit. This also has no effect on anything
other than the sources that are being packaged.
.TP
.B kernel_headers
This target produces a Debian package containing the header files
included in the Linux kernel.
.TP
.B kernel_doc
This target produces a Debian package containing the documentation
included in the Linux kernel.
.TP
.B kernel_image
This target produces a Debian package of the Linux kernel source
image, and any modules configured in the kernel configuration file
.I .config.
If there is no 
.I .config
file in the kernel source directory, a default configuration is
provided similar to the one used to create the
.B Debian
boot\-floppies.  
.IP
If the file 
.I ./debian/post-install
exists, and is an executable, it is run just before the kernel image
package is created.  Also, please note that if there are any scripts in 
.I ./debian/image.d/
directory, 
.B run-parts 
shall be called on that directory just before the kernel image package is
built. The location of the root of the image package being built shall
be passed in the environment variable 
.B IMAGE_TOP,
and the kernel versions is passed in through the environment variable
.B version
for all these scripts.
.IP
On initial installation, the image package updates symbolic links in
the symbolic link destination directory (the root directory by
default) to point to the new kernel image in the image directory,
which is nominally
.I /boot.
If the symbolic link already points to the current kernel image, no
action is taken.  If a prior symbolic link exists, it is rotated out
with a suffix.old, and a new symbolic link, properly updated is
installed in its place (the variable minimal_swap in 
.I /etc/kernel-img.conf
further modifies this behaviour). No action is taken on upgrades.
.IP
On installation, it also offers to run the Linux loader,
.I LILO
(or alternates like 
.I loadlin, SILO, QUIK, VMELILO, ZIPL, yaboot, PALO 
or 
.I GRUB
), creating a configuration file for supported boot loaders
if needed. At that time it also offers to put the new kernel on a
floppy, formatting the floppy if needed.  On deletion, the package
checks the version of the kernel running, and refuses to delete a
running kernel.  
.I grub
rates a special mention here, since grub may not need to be rerun
after installing a kernel image, though an automated change to the
menu list would be nice on install and removal of kernel image
packages. 
.IP
Please see the documentation about hooks in
.B kernel-img.conf(5).
These hooks are variables that can be pointed to scripts that add or
remove  a line from the grub menu list at kernel image install and
remove times. A sample script to add lines to a grub menu file is
included in the directory 
.TT /usr/share/doc/kernel-package/.
.TP
.B build
This target, used by target
.B kernel_image
above, compiles the 
Linux
kernel image.
.TP
.B modules
This target allows you to build all add-on modules and packages that are
very dependent on the precise kernel version they are compiled for at the
same time you build your kernel image.  This target expects to find the 
modules or packages under /usr/src/modules, and, for all such directories,
changes to /usr/src/modules/x, and runs the 
.B kdist
rule in the local 
.I debian.rules
file. This target should create the 
.B Debian
module package(s), and may also produce a compressed tar file, and a
compressed diff file, with
.I md5sums
recorded in a changes file using
.B dpkg-genchanges.
The file is signed by the same identity that would be used to sign the
kernel packages. This option is used by maintainers uploading the
package to the Debian archives. 
.TP
.B modules_config
This target allows you to configure all packages under
.B /usr/src/modules.
This is useful if you need to manually modify some aspects of the
configuration, or if you want to manually compile the add on modules. 
.TP
.B modules_image
This target allows you to build all packages under
.B /usr/src/modules,
but does not create the source or diff files, and does not create and sign
a changes file. This is the only modules related option you need if
you just want to compile the add on modules image files for
installation on one or more machines. Generally called in conjunction
with 
.B kernel_image,
especially if also using the option
.B append_to_version
(prevents spurious warnings).
.TP
.B modules_clean
This target allows you to clean all packages under
.B /usr/src/modules,
and this should be all that is needed to undo the effect of any of the
other modules_ targets.
.TP
.B configure
This target runs configure (actually,
.B config_target,
set by 
.B --config 
which defaults to 
.I oldconfig
) early, so you may edit files generated by
.B make config
in the kernel source directory and not have them stomped by 
.B make\-kpkg 
later.
.TP
.B debian
This target creates the 
.I ./debian
directory, and optionally patches the source. This is called by the 
.B configure 
target. You may use this target to have the sources patched, and then
manually run the configuration step.
.TP
.B libc\-kheaders
This is a special target for the libc-dev maintainer, who can use it
to create the headers package that libc needs. Please note that it is
dangerous to create a libc-kheaders package that is different from the
headers libc was compiled with; it is
.B known
to subtly break systems. Please look at 
.I /usr/share/kernel-package/README.headers
for details.  Creating and installing a self created libc-kheaders
package may break your system unless you know what you are doing. You
have been warned.
.SH "ENVIRONMENT VARIABLES"
The following variables (documented above) affect 
.B make-kpkg:
.I DEBIAN_REVISION_MANDATORY
.I APPEND_TO_VERSION
.I VERSION_H_OK
.I PATCH_THE_KERNEL
.I NO_UNPATCH_BY_DEFAULT
.I KPKG_ARCH
.I CROSS_COMPILE
.I KPKG_SUBARCH
.I ARCH_IN_NAME
.I INITRD
.I SOURCE_CLEAN_HOOK
.I MODULE_LOC
.I INITRD_OK
.SH FILES
Apart from the runtime options, the 
.I debian.rules
file run by
.B make\-kpkg
also looks for a per user configuration file
.I ~/.kernel-pkg.conf.
Failing that, it looks for site\-wide defaults in the file 
.I /etc/kernel-pkg.conf.
The default configuration allows there to be a site wide override for
the full name and email address of the person responsible for maintaining 
the kernel packages on the site, but the 
.I /etc/kernel-pkg.conf
(or
.I ~/.kernel-pkg.conf.
) file is actually a Makefile snippet, and any legal make directives
may be included in there.  
.B Note:
Caution is urged with this file, since you can totally change the way that the 
make is run by suitably editing this file. Please look at
.I /usr/share/doc/kernel-package/Problems.gz
for a list of known problems while compiling kernel images. Extensive
tutorial like documentation is also available in
.I /usr/share/doc/kernel-package/README.gz
and it is recommended that one read that before using this utility.
.SH "SEE ALSO"
.BR kernel-pkg.conf (5),
.BR kernel-img.conf (5),
.BR Getopt::Long (3perl),
.BR dpkg-deb (1),
.BR dpkg-source (1),
.BR make (1),
.BR The\ Programmers\ manual, 
.BR The\ GNU\ Make\ manual,
and the extensive documentation in the directory 
.B /usr/share/doc/kernel-package
.SH AUTHOR
This manual page was written by Manoj Srivastava <srivasta@debian.org>,
for the Debian GNU/Linux system.