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debhelper

NAME

debhelper - the debhelper tool suite

SYNOPSIS

dh_* [-v] [-a] [-i] [-s] [--no-act] [-ppackage] [-Npackage] [-Ptmpdir]

DESCRIPTION

Debhelper is used to help you build a debian package. The philosophy behind debhelper is to provide a collection of small, simple, and easily understood tools that are used in debian/rules to automate various common aspects of building a package. This means less work for you, the packager. It also, to some degree means that these tools can be changed if debian policy changes, and packages that use them will require only a rebuild to comply with the new policy.

A typical debian/rules file that uses debhelper will call several debhelper commands in sequence, or use dh(1) to automate this process. Examples of rules files that use debhelper are in /usr/share/doc/debhelper/examples/

To create a new debian package using debhelper, you can just copy one of the sample rules files and edit it by hand. Or you can try the dh-make package, which contains a dh_make command that partially automates the process. For a more gentle introduction, the maint-guide debian package contains a tutorial about making your first package using debhelper.

DEBHELPER COMMANDS

Here is the list of debhelper commands you can use. See their man pages for additional documentation.

dh_apparmor(1)

reload AppArmor profile and create local include

dh_auto_build(1)

automatically builds a package

dh_auto_clean(1)

automatically cleans up after a build

dh_auto_configure(1)

automatically configure a package prior to building

dh_auto_install(1)

automatically runs make install or similar

dh_auto_test(1)

automatically runs a package's test suites

dh_bugfiles(1)

install bug reporting customization files into package build directories

dh_builddeb(1)

build debian binary packages

dh_clean(1)

clean up package build directories

dh_compress(1)

compress files and fix symlinks in package build directories

dh_fixperms(1)

fix permissions of files in package build directories

dh_gconf(1)

install GConf defaults files and register schemas

dh_gencontrol(1)

generate and install control file

dh_icons(1)

Update Freedesktop icon caches

dh_install(1)

install files into package build directories

dh_installcatalogs(1)

install and register SGML Catalogs

dh_installchangelogs(1)

install changelogs into package build directories

dh_installcron(1)

install cron scripts into etc/cron.*

dh_installdeb(1)

install files into the DEBIAN directory

dh_installdebconf(1)

install files used by debconf in package build directories

dh_installdirs(1)

create subdirectories in package build directories

dh_installdocs(1)

install documentation into package build directories

dh_installemacsen(1)

register an emacs add on package

dh_installexamples(1)

install example files into package build directories

dh_installifupdown(1)

install if-up and if-down hooks

dh_installinfo(1)

install info files

dh_installinit(1)

install upstart jobs or init scripts into package build directories

dh_installlogcheck(1)

install logcheck rulefiles into etc/logcheck/

dh_installlogrotate(1)

install logrotate config files

dh_installman(1)

install man pages into package build directories

dh_installmenu(1)

install debian menu files into package build directories

dh_installmime(1)

install mime files into package build directories

dh_installmodules(1)

register modules with modutils

dh_installpam(1)

install pam support files

dh_installppp(1)

install ppp ip-up and ip-down files

dh_installudev(1)

install udev rules files

dh_installwm(1)

register a window manager

dh_installxfonts(1)

register X fonts

dh_link(1)

create symlinks in package build directories

dh_lintian(1)

install lintian override files into package build directories

dh_listpackages(1)

list binary packages debhelper will act on

dh_makeshlibs(1)

automatically create shlibs file and call dpkg-gensymbols

dh_md5sums(1)

generate DEBIAN/md5sums file

dh_movefiles(1)

move files out of debian/tmp into subpackages

dh_perl(1)

calculates perl dependencies and cleans up after MakeMaker

dh_prep(1)

perform cleanups in preparation for building a binary package

dh_shlibdeps(1)

calculate shared library dependencies

dh_strip(1)

strip executables, shared libraries, and some static libraries

dh_testdir(1)

test directory before building debian package

dh_testroot(1)

ensure that a package is built as root

dh_usrlocal(1)

migrate usr/local directories to maintainer scripts

Deprecated Commands

A few debhelper commands are deprecated and should not be used.

dh_desktop(1)

deprecated no-op

dh_installmanpages(1)

old-style man page installer (deprecated)

dh_python(1)

calculates python dependencies and adds postinst and prerm python scripts (deprecated)

dh_scrollkeeper(1)

deprecated no-op

dh_suidregister(1)

suid registration program (deprecated)

dh_undocumented(1)

undocumented.7 symlink program (deprecated no-op)

Other Commands

If a program's name starts with ``dh_'', and the program is not on the above lists, then it is not part of the debhelper package, but it should still work like the other programs described on this page.

DEBHELPER CONFIG FILES

Many debhelper commands make use of files in debian/ to control what they do. Besides the common debian/changelog and debian/control, which are in all packages, not just those using debhelper, some additional files can be used to configure the behavior of specific debhelper commands. These files are typically named debian/package.foo (where ``package'' of course, is replaced with the package that is being acted on).

For example, dh_installdocs uses files named debian/package.docs to list the documentation files it will install. See the man pages of individual commands for details about the names and formats of the files they use. Generally, these files will list files to act on, one file per line. Some programs in debhelper use pairs of files and destinations or slightly more complicated formats.

Note that if a package is the first (or only) binary package listed in debian/control, debhelper will use debian/foo if no debian/package.foo file can be found.

In some rare cases, you may want to have different versions of these files for different architectures or OSes. If files named debian/package.foo.ARCH or debian/package.foo.OS exist, where ``ARCH'' and ``OS'' are the same as the output of ``dpkg-architecture -qDEB_HOST_ARCH'' / ``dpkg-architecture -qDEB_HOST_ARCH_OS'', then they will be used in preference to other, more general files.

In many cases, these config files are used to specify various types of files. Documentation or example files to install, files to move, and so on. When appropriate, in cases like these, you can use standard shell wildcard characters ('?' and '*' and '[..]' character classes) in the files.

You can also put comments in these files; lines beginning with ``#'' are ignored.

SHARED DEBHELPER OPTIONS

The following command line options are supported by all debhelper programs.

-v, --verbose

Verbose mode: show all commands that modify the package build directory.

--no-act

Do not really do anything. If used with -v, the result is that the command will output what it would have done.

-a, --arch

Act on architecture dependent packages that should be built for the build architecture.

-i, --indep

Act on all architecture independent packages.

-ppackage, --package=package

Act on the package named ``package''. This option may be specified multiple times to make debhelper operate on a given set of packages.

-s, --same-arch

This used to be a smarter version of the -a flag, but the -a flag is now equally smart.

-Npackage, --no-package=package

Do not act on the specified package even if an -a, -i, or -p option lists the package as one that should be acted on.

--remaining-packages

Do not act on the packages which have already been acted on by this debhelper command earlier (i.e. if the command is present in the package debhelper log). For example, if you need to call the command with special options only for a couple of binary packages, pass this option to the last call of the command to process the rest of packages with default settings.

--ignore=file

Ignore the specified file. This can be used if debian/ contains a debhelper config file that a debhelper command should not act on. Note that debian/compat, debian/control, and debian/changelog can't be ignored, but then, there should never be a reason to ignore those files.

For example, if upstream ships a debian/init that you don't want dh_installinit to install, use --ignore=debian/init

-Ptmpdir, --tmpdir=tmpdir

Use ``tmpdir'' for package build directory. The default is debian/<package>

--mainpackage=package

This little-used option changes the package which debhelper considers the ``main package'', that is, the first one listed in debian/control, and the one for which debian/foo files can be used instead of the usual debian/package.foo files.

-O=option|bundle

This is used by dh(1) when passing user-specified options to all the commands it runs. If the command supports the specified option or option bundle, it will take effect. If the command does not support the option (or any part of an option bundle), it will be ignored.

COMMON DEBHELPER OPTIONS

The following command line options are supported by some debhelper programs. See the man page of each program for a complete explanation of what each option does.

-n

Do not modify postinst/postrm/etc scripts.

-Xitem, --exclude=item

Exclude an item from processing. This option may be used multiple times, to exclude more than one thing.

-A, --all

Makes files or other items that are specified on the command line take effect in ALL packages acted on, not just the first.

BUILD SYSTEM OPTIONS

The following command line options are supported by all of the dh_auto_* debhelper programs. These programs support a variety of build systems, and normally heuristically determine which to use, and how to use them. You can use these command line options to override the default behavior.

-Sbuildsystem, --buildsystem=buildsystem

Force use of the specified buildsystem, instead of trying to auto-select one which might be applicable for the package.

-Ddirectory, --sourcedirectory=directory

Assume that the original package source tree is at the specified directory rather than the top level directory of the Debian source package tree.

-B[directory], --builddirectory=[directory]

Enable out of source building and use the specified directory as the build directory. If directory parameter is omitted, a default build directory will chosen.

If this option is not specified, building will be done in source by default unless the build system requires or prefers out of source tree building. In such a case, the default build directory will be used even if --builddirectory is not specified.

If the build system prefers out of source tree building but still allows in source building, the latter can be re-enabled by passing a build directory path that is the same as the source directory path.

--parallel

Enable parallel builds if underlying build system supports them. The number of parallel jobs is controlled by the DEB_BUILD_OPTIONS environment variable (``Debian Policy, section 4.9.1'') at build time. It might also be subject to a build system specific limit.

If this option is not specified, debhelper currently defaults to not allowing parallel package builds.

--max-parallel=maximum

This option implies --parallel and allows further limiting the number of jobs that can be used in a parallel build. If the package build is known to only work with certain levels of concurrency, you can set this to the maximum level that is known to work, or that you wish to support.

--list, -l

List all build systems supported by debhelper on this system. The list includes both default and third party build systems (marked as such). Also shows which build system would be automatically selected, or which one is manually specified with the --buildsystem option.

NOTES

Multiple binary package support

If your source package generates more than one binary package, debhelper programs will default to acting on all binary packages when run. If your source package happens to generate one architecture dependent package, and another architecture independent package, this is not the correct behavior, because you need to generate the architecture dependent packages in the binary-arch debian/rules target, and the architecture independent packages in the binary-indep debian/rules target.

To facilitate this, as well as give you more control over which packages are acted on by debhelper programs, all debhelper programs accept the -a, -i, -p, and -s parameters. These parameters are cumulative. If none are given, debhelper programs default to acting on all packages listed in the control file.

Automatic generation of debian install scripts

Some debhelper commands will automatically generate parts of debian maintainer scripts. If you want these automatically generated things included in your existing debian maintainer scripts, then you need to add ``#DEBHELPER#'' to your scripts, in the place the code should be added. ``#DEBHELPER#'' will be replaced by any auto-generated code when you run dh_installdeb.

If a script does not exist at all and debhelper needs to add something to it, then debhelper will create the complete script.

All debhelper commands that automatically generate code in this way let it be disabled by the -n parameter (see above).

Note that the inserted code will be shell code, so you cannot directly use it in a perl script. If you would like to embed it into a perl script, here is one way to do that (note that I made sure that $1, $2, etc are set with the set command):

   my $temp="set -e\nset -- @ARGV\n" . << 'EOF';
   #DEBHELPER#
   EOF
   system ($temp) / 256 == 0
         or die "Problem with debhelper scripts: $!";
 
 

Automatic generation of miscellaneous dependencies.

Some debhelper commands may make the generated package need to depend on some other packages. For example, if you use dh_installdebconf(1), your package will generally need to depend on debconf. Or if you use dh_installxfonts(1), your package will generally need to depend on a particular version of xutils. Keeping track of these miscellaneous dependencies can be annoying since they are dependant on how debhelper does things, so debhelper offers a way to automate it.

All commands of this type, besides documenting what dependencies may be needed on their man pages, will automatically generate a substvar called ${misc:Depends}. If you put that token into your debian/control file, it will be expanded to the dependencies debhelper figures you need.

This is entirely independent of the standard ${shlibs:Depends} generated by dh_makeshlibs(1), and the ${perl:Depends} generated by dh_perl(1). You can choose not to use any of these, if debhelper's guesses don't match reality.

Package build directories

By default, all debhelper programs assume that the temporary directory used for assembling the tree of files in a package is debian/<package>.

Sometimes, you might want to use some other temporary directory. This is supported by the -P flag. For example, ``dh_installdocs -Pdebian/tmp'', will use debian/tmp as the temporary directory. Note that if you use -P, the debhelper programs can only be acting on a single package at a time. So if you have a package that builds many binary packages, you will need to also use the -p flag to specify which binary package the debhelper program will act on.

Debhelper compatibility levels

From time to time, major non-backwards-compatible changes need to be made to debhelper, to keep it clean and well-designed as needs change and its author gains more experience. To prevent such major changes from breaking existing packages, the concept of debhelper compatibility levels was introduced. You tell debhelper which compatibility level it should use, and it modifies its behavior in various ways.

Tell debhelper what compatibility level to use by writing a number to debian/compat. For example, to turn on v8 mode:

   % echo 8 > debian/compat
 
 

Unless otherwise indicated, all debhelper documentation assumes that you are using the most recent compatibility level, and in most cases does not indicate if the behavior is different in an earlier compatibility level, so if you are not using the most recent compatibility level, you're advised to read below for notes about what is different in earlier compatibility levels.

These are the available compatibility levels:

v1

This is the original debhelper compatibility level, and so it is the default one. In this mode, debhelper will use debian/tmp as the package tree directory for the first binary package listed in the control file, while using debian/<package> for all other packages listed in the control file.

This mode is deprecated.

v2

In this mode, debhelper will consistently use debian/<package> as the package tree directory for every package that is built.

This mode is deprecated.

v3

This mode works like v2, with the following additions:

-

Debhelper config files support globbing via * and ?, when appropriate. To turn this off and use those characters raw, just prefix with a backslash.

-

dh_makeshlibs makes the postinst and postrm scripts call ldconfig.

-

Every file in etc/ is automatically flagged as a conffile by dh_installdeb.

This mode is deprecated.

v4

Changes from v3 are:

-

dh_makeshlibs -V will not include the debian part of the version number in the generated dependency line in the shlibs file.

-

You are encouraged to put the new ${misc:Depends} into debian/control to supplement the ${shlibs:Depends} field.

-

dh_fixperms will make all files in bin/ directories and in etc/init.d executable.

-

dh_link will correct existing links to conform with policy.

This mode is deprecated.

v5

Changes from v4 are:

-

Comments are ignored in debhelper config files.

-

dh_strip --dbg-package now specifies the name of a package to put debugging symbols in, not the packages to take the symbols from.

-

dh_installdocs skips installing empty files.

-

dh_install errors out if wildcards expand to nothing.

v6

Changes from v5 are:

-

Commands that generate maintainer script fragments will order the fragments in reverse order for the prerm and postrm scripts.

-

dh_installwm will install a slave manpage link for x-window-manager.1.gz, if it sees the man page in usr/share/man/man1 in the package build directory.

-

dh_builddeb did not previously delete everything matching DH_ALWAYS_EXCLUDE, if it was set to a list of things to exclude, such as ``CVS:.svn:.git''. Now it does.

-

dh_installman allows overwriting existing man pages in the package build directory. In previous compatibility levels it silently refuses to do this.

v7

Changes from v6 are:

-

dh_install, will fall back to looking for files in debian/tmp if it doesn't find them in the current directory (or wherever you tell it look using --sourcedir). This allows dh_install to interoperate with dh_auto_install, which installs to debian/tmp, without needing any special parameters.

-

dh_clean will read debian/clean and delete files listed there.

-

dh_clean will delete toplevel *-stamp files.

-

dh_installchangelogs will guess at what file is the upstream changelog if none is specified.

v8

This is the recommended mode of operation.

Changes from v7 are:

-

Commands will fail rather than warning when they are passed unknown options.

-

dh_makeshlibs will run dpkg-gensymbols on all shared libraries that it generates shlibs files for. So -X can be used to exclude libraries. Also, libraries in unusual locations that dpkg-gensymbols would not have processed before will be passed to it, a behavior change that can cause some packages to fail to build.

-

dh requires the sequence to run be specified as the first parameter, and any switches come after it. Ie, use ``dh $@ --foo'', not ``dh --foo $@''

dh_auto_* prefer to use perl's Module::Build in preference to Makefile.PL.

udebs

Debhelper includes support for udebs. To create a udeb with debhelper, add ``Package-Type: udeb'' to the package's stanza in debian/control, and build-depend on debhelper (>= 4.2). Debhelper will try to create udebs that comply with debian-installer policy, by making the generated package files end in ``.udeb'', not installing any documentation into a udeb, skipping over preinst, postrm, prerm, and config scripts, etc.

Other notes

In general, if any debhelper program needs a directory to exist under debian/, it will create it. I haven't bothered to document this in all the man pages, but for example, dh_installdeb knows to make debian/<package>/DEBIAN/ before trying to put files there, dh_installmenu knows you need a debian/<package>/usr/share/menu/ before installing the menu files, etc.

Once your package uses debhelper to build, be sure to add debhelper to your Build-Depends line in debian/control. You should build-depend on a version of debhelper equal to (or greater than) the debhelper compatibility level your package uses. So if your package used compatibility level 7:

   Build-Depends: debhelper (>= 7)
 
 

ENVIRONMENT

DH_VERBOSE

Set to 1 to enable verbose mode. Debhelper will output every command it runs that modifies files on the build system.

DH_COMPAT

Temporarily specifies what compatibility level debhelper should run at, overriding any value in debian/compat.

DH_NO_ACT

Set to 1 to enable no-act mode.

DH_OPTIONS

Anything in this variable will be prepended to the command line arguments of all debhelper commands. Command-specific options will be ignored by commands that do not support them.

This is useful in some situations, for example, if you need to pass -p to all debhelper commands that will be run. One good way to set DH_OPTIONS is by using ``Target-specific Variable Values'' in your debian/rules file. See the make documentation for details on doing this.

DH_ALWAYS_EXCLUDE

If set, this adds the value the variable is set to to the -X options of all commands that support the -X option. Moreover, dh_builddeb will rm -rf anything that matches the value in your package build tree.

This can be useful if you are doing a build from a CVS source tree, in which case setting DH_ALWAYS_EXCLUDE=CVS will prevent any CVS directories from sneaking into the package you build. Or, if a package has a source tarball that (unwisely) includes CVS directories, you might want to export DH_ALWAYS_EXCLUDE=CVS in debian/rules, to make it take effect wherever your package is built.

Multiple things to exclude can be separated with colons, as in DH_ALWAYS_EXCLUDE=CVS:.svn

SEE ALSO

/usr/share/doc/debhelper/examples/

A set of example debian/rules files that use debhelper.

<http://kitenet.net/~joey/code/debhelper/>

Debhelper web site.

AUTHOR

Joey Hess <joeyh@debian.org>