Ubuntu Manpage: debhelper-compat-upgrade-checklist - Upgrade checklist for supported debhelper compat levels

Provided by: debhelper_13.18ubuntu2.1_all

NAME

       debhelper-compat-upgrade-checklist - Upgrade checklist for supported debhelper compat levels

SYNOPSIS

       This document is an upgrade checklist of all the supported debhelper compat levels. It also lists all the
       supported debhelper compat levels.

       Information about how to declare the compat level is in "COMPATIBILITY LEVELS" in debhelper(7).

       If you are upgrading from a (now) obsolete compat level, then please refer to
       debhelper-obsolete-compat(7).

DESCRIPTION

Upgrade checklist for supported compatibility levels
These are the available compatibility levels:

v15 This compatibility level is still open for development; use with caution.

Changes from v14 are:

- The single-binary add-on for dh is no longer implicitly activated by source packages that
have a single Package stanza in debian/control. If the package needs the short-cuts for
single-binary packages, it must explicitly activate the single-binary add-in.

This can be done via a Build-Depends on dh-sequence-single-binary.

Any --without single-binary passed to dh to avoid the warning in compat 14 can now be removed
to simplify debian/rules without triggering the warning.

- It is now an error to use package-less versions of debhelper configuration files when there
are 2 or more binary packages listed in debian/control in most cases. Legacy files should be
renamed to debian/package.foo (from debian/foo) where package is the first binary package
listed in debian/control.

The primary exception to this change are files such as debian/changelog, debian/NEWS, and
debian/copyright, where the same file is used for all packages by default. These cases will
remain unchanged.

- It is now an error to use a packaging file without the package prefix for --name even if the
source package only produces one binary package. As example, if you had a debian/bar.service
with the following snippet in debian/rules:

override_dh_installsystemd:
dh_installsystemd -p foo --name bar

Then you need to rename debian/bar.service to debian/foo.bar.service.

v14 This compatibility level is still open for development; use with caution.

Changes from v13 are:

- The dh_installpam tool will now install PAM configuration files under /usr/lib/pam.d/package
instead of /etc/pam.d/package.

Please consider using the "rm_conffile" feature from dh_installdeb(1) to ensure the proper
removal of previous PAM files.

- Packages using the dh sequencer should be aware the following changes:

- The order and placement has changed for dh_strip_nondeterminism, dh_compress, and
dh_fixperm. Previously, these three commands were run in the listed order between
dh_installxfonts and dh_missing.

Their new placement is after dh_missing (arch:all) or dh_shlibdeps (arch:any) and before
dh_installdeb. Additionally, their new order is dh_fixperms, dh_strip_nondeterminism, and
then dh_compress.

This change may require updates to third-party add-ons that use either of these three
commands as anchor or to hook targets for any of these commands that made assumptions
about the command order.

Additionally, dh_strip_nondeterminism and dh_compress plus any commands added by third-
party add-ons using these as anchors will no longer be able to rely on the mode/ownership
normalization by dh_fixperms, which may expose bugs in the form of incorrect mode or
ownership in the resulting deb.

Please file any such bugs against the relevant tool. Feel free to include the debhelper
maintainers in CC.

- The tool dh_installsysusers is now included in the default sequence. This helper tool
will process systemd sysusers files.

- The dh_installsystemduser tool will default to enabling systemd user units, start them on
installation, restart them on upgrades and stop them on uninstalling the package.

- Use of the dh_gconf command in override and hook targets now causes an error. The
dh_gconf command has been a no-op for years and was removed in debhelper 13.4.

- The dh_installalternatives tool will now be run after dh_link rather than after
dh_installinitramfs in the default dh sequence.

- This item only applies to source packages that have exactly one Package stanza in
debian/control.

The dh_auto_install command now unconditionally uses --destdir=debian/tmp by default. The
special-case for source packages building a single binary package is now moved to single-
binary dh addon. Note, this add-on is activated by default in compat 14 but not in compat
15 (see next bullet item).

- This item only applies to source packages that have exactly one Package stanza in
debian/control.

The dh sequencer will warn if the single-binary addon is implicitly activated to warn
maintainers of the pending compat 15 change in dh_auto_install. The implicit activation
is a transitional feature to reduce the changes of risks with this change. In compat 15,
the implicit activation will no longer trigger.

Maintainers are urged to either explicitly activate the single-binary addon to preserve
the existing behaviour (e.g., by adding dh-sequence-single-binary to Build-Depends), or
explicitly passing --destdir to dh_auto_install if used and then passing --without
single-binary to dh (the latter to silence the warning).

The rationale for this change is to avoid "surprises" when adding a second binary package
later. Previously, debhelper would silently change behaviour often resulting in empty
binary packages being uploaded to the archive by mistake. With the new behaviour, the
single-binary addon will detect the mismatch and warn the maintainer of what is about to
happen.

- The dh_control tool now automatically applies relationship substvars to relevant fields. That
means that many substvars such as ${misc:Depends} and ${shlibs:Depends} no longer need to be
explicitly mentioned in debian/control. This applies to any substvar named after a field that
the installed version of dpkg considers a relation or dependency-like field. At the time of
writing, the list consists of:

- Pre-Depends

- Depends

- Recommends

- Suggests

- Enhances

- Conflicts

- Breaks

- Replaces

- Provides

- Built-Using

- Static-Built-Using

This means that Depends: foo, ${misc:Depends} in debian/control can now be reduced to
Depends: foo and Depends: ${misc:Depends}, ${shlibs:Depends} can be removed entirely as
examples of how the feature works.

Note that other substvars such as ${binary:Version} are unaffected by this change and should
still be used explicitly as necessary. Additionally, for Essential: yes packages that
manually promoted ${shlibs:Depends} into Pre-Depends field, dh_shlibdeps will handle this
automatically as well (see the next compat item).

See <https://lists.debian.org/debian-devel/2024/02/msg00230.html> for the details of this
proposal. The summary in <https://lists.debian.org/debian-devel/2024/03/msg00030.html> also
covers when the substvars need tweaking. The most common case involves using the -d option
from dpkg-shlibdeps possibly via dh_shlibdeps.

Note: This change will cause false-positives from an unfixed lintian. Please check
<https://bugs.debian.org/1067653> for lintian support for this change.

- The dh_shlibdeps tool now defaults to using ${shlibs:Pre-Depends} for packages that are
Essential: yes.

Note due to the dh_gencontrol change above, any package using dh_gencontrol will not have to
do anything for this migration.

- The debhelper configuration files are subject to the following changes:

- It now triggers a warning to use package-less versions of debhelper configuration files
when there are 2 or more binary packages listed in debian/control in most cases. Legacy
files should be renamed to debian/package.foo (from debian/foo) where package is the
first binary package listed in debian/control.

The primary exception to this change are files such as debian/changelog, debian/NEWS, and
debian/copyright, where the same file is used for all packages by default. These cases
will remain unchanged. The debhelper tool using the files will trigger warnings on
usage.

In compat 15 (or later), this is changed to an error.

- It is now triggers a warning to use a packaging file without the package prefix for
--name even if the source package only produces one binary package. As example, if you
had a debian/bar.service with the following snippet in debian/rules:

override_dh_installsystemd:
dh_installsystemd -p foo --name bar

Then you need to rename debian/bar.service to debian/foo.bar.service.

In compat 15 (or later), this is changed to an error.

- The default look up rules for Dh_Lib based tools now assumes that configuration files are
no longer named (--name) nor support architecture restrictions by default. If you work
with a third-party debhelper-like tool and need support for either of these features,
please file a bug against the tool asking it to declare its configuration file with the
relevant options in its pkgfile call.

Note that debhelper itself tweaked its rules for most of its tools as well based on
analysis of usage via codesearch.debian.org. Should you be relying on a feature like
architecture restrictions for a given config file that is no longer supported, please
file a feature request for the use-case and it might be restored.

- Packages using the cmake build system should be aware of the following changes:

- The cmake buildsystem now passes -DCMAKE_BUILD_RPATH_USE_ORIGIN=ON to cmake(1) to avoid
some reproducibility issues.

- The cmake build system now sets the ASMFLAGS environment variable when it is unset and
ASFLAGS is present. The former name (ASMFLAGS) is the name cmake expects, while the
latter (ASFLAGS) is the name that dpkg-buildpackage(1) uses.

- The cmake build systems now use cmake --install instead of make install in the
dh_auto_install(1) call. Any override of dh_auto_install that passes extra parameters to
the upstream build system should be reviewed.

- Packages using the meson build system should be aware of the following changes:

- The meson build system now passes --auto-features=enabled to meson.

- The meson+ninja build system now use meson install instead of ninja install in the
dh_auto_install(1) call. Any override of dh_auto_install that passes extra parameters to
the upstream build system should be reviewed.

- The debian/compat file is no longer accepted as a source for specifying the debhelper compat
level. Put the compat level in the X-DH-Compat field of the Source stanza of debian/control.

Note to avoid breaking packages that already migrated to compat 14 immediately, while it was
experimental this change is first enforced when compat 14 becomes stable.

- The tool dh_installtmpfiles now runs with --remove on package removal, and --purge on package
purge. systemd v256 is required for the latter.

v13 This is the recommended mode of operation.

Changes from v12 are:

- The meson+ninja build system now uses meson test instead of ninja test when running the test
suite. Any override of dh_auto_test that passes extra parameters to upstream test runner
should be reviewed as meson test is not command line compatible with ninja test.

- All debhelper like tools based on the official debhelper library (including dh and the
official dh_* tools) no longer accepts abbreviated command parameters. At the same time, dh
now optimizes out calls to redundant dh_* helpers even when passed long command line options.

- The ELF related debhelper tools (dh_dwz, dh_strip, dh_makeshlibs, dh_shlibdeps) are now only
run for arch dependent packages by default (i.e. they are excluded from *-indep targets and
are passed -a by default). If you need them for *-indep targets, you can add an explicit
Build-Depends on dh-sequence-elf-tools.

- The third-party gradle build system (from gradle-debian-helper package) now runs the
upstream-provided test suite automatically. To suppress such behavior, override
dh_auto_test.

- The dh_installman tool now aborts if it sees conflicting definitions of a manpage. This
typically happens if the upstream build system is installing a compressed version and the
package lists an uncompressed version of the manpage in debian/package.manpages. Often the
easiest fix is to remove the manpage from debian/package.manpages (assuming both versions are
identical).

- The dh_auto_* helpers now reset the environment variables HOME and common XDG_* variable.
Please see description of the environment variables in "ENVIRONMENT" in debhelper(1) for how
this is handled.

This feature changed between debhelper 13 and debhelper 13.2.

- The dh command will now error if an override or hook target for an obsolete command are
present in debian/rules (e.g. override_dh_systemd_enable:).

- The dh_missing command will now default to --fail-missing. This can be reverted to a non-
fatal warning by explicitly passing --list-missing like it was in compat 12.

If you do not want the warning either, please omit the call to dh_missing. If you use the dh
command sequencer, then you can do this by inserting an empty override target in the
debian/rules file of the relevant package. As an example:

# Disable dh_missing
override_dh_missing:

- The dh command sequencer now runs dh_installtmpfiles in the default sequence. The
dh_installtmpfiles takes over handling of tmpfiles.d configuration files. Related
functionality in dh_installsystemd is now disabled.

Note that dh_installtmpfiles responds to debian/package.tmpfiles where dh_installsystemd used
a name without the trailing "s".

- Many dh_* tools now support limited variable expansion via the ${foo} syntax. In many cases,
this can be used to reference paths that contain either spaces or dpkg-architecture(1)
values. While this can reduce the need for dh-exec(1) in some cases, it is not a replacement
dh-exec(1) in general. If you need filtering, renaming, etc., the package will still need
dh-exec(1).

Please see "Substitutions in debhelper config files" for syntax and available substitution
variables. To dh_* tool writers, substitution expansion occurs as a part of the filearray
and filedoublearray functions.

- The dh command sequencer will now skip all hook and override targets for dh_auto_test, dh_dwz
and dh_strip when DEB_BUILD_OPTIONS lists the relevant nocheck / nostrip options.

Any package relying on these targets to always be run should instead move relevant logic out
of those targets. E.g. non-test related packaging code from override_dh_auto_test would have
to be moved to execute_after_dh_auto_build or execute_before_dh_auto_install.

- The cmake buildsystem now passes -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=ON to cmake(1) to speed
up automatic installation process. If for some reason you need previous behavior, override
the flag:

dh_auto_configure -- -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=OFF ...

v12 Changes from v11 are:

- The dh_makeshlibs tool now generates shlibs files with versioned dependency by default. This
means that -VUpstream-Version (a.k.a. -V) is now the default.

If an unversioned dependency in the shlibs file is wanted, this can be obtained by passing
-VNone instead. However, please see dh_makeshlibs(1) for the caveat of unversioned
dependencies.

- The -s (--same-arch) option is removed. Please use -a (--arch) instead.

- Invoking dh_clean -k now causes an error instead of a deprecation warning.

- The --no-restart-on-upgrade option in dh_installinit has been removed. Please use the new
name --no-stop-on-upgrade

- There was a bug in the doit (and similar) functions from Debian::Debhelper::Dh_Lib that made
them spawn a shell in one particular circumstance. This bug is now removed and will cause
helpers that rely on the bug to fail with a "command not found"-error.

- The --list-missing and --fail-missing in dh_install has been removed. Please use dh_missing
and its corresponding options, which can also see the files installed by other helpers.

- The dh_installinit helper no longer installs configuration for the upstart init system.
Instead, it will abort the build if it finds an old upstart configuration file. The error is
there to remind the package maintainer to ensure the proper removal of the conffiles shipped
in previous versions of the package (if any).

- The dh_installdeb tool will do basic validation of some dpkg-maintscript-helper(1) commands
and will error out if the commands appear to be invalid.

- The dh_missing tool will now default to --list-missing.

- The dh_makeshlibs tool will now only pass libraries to dpkg-gensymbols(1) if the ELF binary
has a SONAME (containing ".so").

- The dh_compress tool no longer compresses examples (i.e. anything installed in
</usr/share/doc/package/examples>.)

- The standard sequence in dh now includes dh_dwz and dh_installinitramfs by default. This
makes the dwz and installinitramfs sequences obsolete and they will now fail with an error.
If you want to skip these commands, then please insert an empty override target for them in
debian/rules (e.g. override_dh_dwz:)

- The build systems meson and autoconf no longer explicitly set the --libexecdir variable and
thus relies on the build system default - which should be /usr/libexec (per FHS 3.0, adopted
in Debian Policy 4.1.5).

If a particular upstream package does not use the correct default, the parameter can often be
passed manually via dh_auto_configure(1). E.g. via the following example:

override_dh_auto_configure:
dh_auto_configure -- --libexecdir=/usr/libexec

Note the -- before the --libexecdir parameter.

- Retroactively removed in debhelper/13.5:

The dh_installdeb tool would no longer install the maintainer provided conffiles file as it
was deemed unnecessary. However, the remove-on-upgrade from dpkg/1.20 made the file relevant
again and dh_installdeb now installs it again in compat levels 12+.

- The dh_installsystemd tool no longer relies on dh_installinit for handling systemd services
that have a sysvinit alternative. Both tools must now be used in such a case to ensure the
service is properly started under both sysvinit and systemd.

If you have an override for dh_installinit (e.g. to call it with --no-start) then you will
probably need one for dh_installsystemd as well now.

This change makes dh_installinit inject a misc:Pre-Depends for init-system-helpers (>=
1.54~). Please ensure that the package lists ${misc:Pre-Depends} in its Pre-Depends field
before upgrading to compat 12.

- The third-party dh_golang tool (from dh-golang package) now defaults on honoring
DH_GOLANG_EXCLUDES variable for source installation in -dev packages and not only during the
building process. Please set DH_GOLANG_EXCLUDES_ALL to false to revert to the previous
behaviour. See Debian::Debhelper::Buildsystem::golang(3pm) for details and examples.

- dh_installsystemduser is now included in the dh standard sequence by default.

- The python-distutils buildsystem is now removed. Please use the third-party build system
pybuild instead.

v11 This mode is discouraged.

The compat 11 is discouraged for new packages as it suffers from feature interaction between
dh_installinit and dh_installsystemd causing services to not run correctly in some cases. Please
consider using compatibility mode 10 or 12 instead. More details about the issue are available in
Debian#887904 and <https://lists.debian.org/debian-release/2019/04/msg01442.html>.

Changes from v10 are:

- dh_installinit no longer installs service or tmpfile files, nor generates maintainer scripts
for those files. Please use the new dh_installsystemd helper.

- The dh_systemd_enable and dh_systemd_start helpers have been replaced by the new
dh_installsystemd helper. For the same reason, the systemd sequence for dh has also been
removed. If you need to disable the dh_installsystemd helper tool, please use an empty
override target.

Please note that the dh_installsystemd tool has a slightly different behaviour in some cases
(e.g. when using the --name parameter).

- dh_installdirs no longer creates debian/package directories unless explicitly requested (or
it has to create a subdirectory in it).

The vast majority of all packages will be unaffected by this change.

- The makefile buildsystem now passes INSTALL="install --strip-program=true" to make(1).
Derivative buildsystems (e.g. configure or cmake) are unaffected by this change.

- The autoconf buildsystem now passes --runstatedir=/run to ./configure.

- The cmake buildsystem now passes -DCMAKE_INSTALL_RUNSTATEDIR=/run to cmake(1).

- dh_installman will now prefer detecting the language from the path name rather than the
extension.

- dh_auto_install will now only create the destination directory it needs. Previously, it
would create the package build directory for all packages. This will not affect packages
that only build with debhelper commands, but it may expose bugs in commands not included in
debhelper.

- The helpers dh_installdocs, dh_installexamples, dh_installinfo, and dh_installman now error
out if their config has a pattern that does not match anything or reference a path that does
not exist.

Known exceptions include building with the nodoc profile, where the above tools will silently
permit failed matches where the patterns are used to specify documentation.

- The helpers dh_installdocs, dh_installexamples, dh_installinfo, and dh_installman now accept
the parameter --sourcedir with same meaning as dh_install. Furthermore, they now also fall
back to debian/tmp like dh_install.

Migration note: A bug in debhelper 11 up to 11.1.5 made dh_installinfo incorrectly ignore
--sourcedir.

- The perl-makemaker and perl-build build systems no longer pass -I. to perl. Packages that
relies on this behavior can often use the PERL5LIB environment variable as a substitute.
E.g. by adding export PERL5LIB=. in their debian/rules file (or similar).

- The PERL_USE_UNSAFE_INC environment variable is no longer set by dh or any of the dh_auto_*
tools. It was added as a temporary work around to avoid a lot of packages failing to build
at the same time.

Note this item will eventually become obsolete as upstream intends to drop support for the
PERL_USE_UNSAFE_INC environment variable. When perl drops support for it, then this variable
will be removed retroactively from existing compat levels as well.

- The dh_makeshlibs helper will now exit with an error if objdump returns a non-zero exit from
analysing a given file.

- The dh_installdocs and dh_installexamples tools may now install most of the documentation in
a different path to comply with the recommendation from Debian policy §12.3 (since version
3.9.7).

Note that if a given source package only contains a single binary package in debian/control
or none of the packages are -doc packages, then this change is not relevant for that source
package and you can skip to the next change.

By default, these tools will now attempt to determine a "main package for the documentation"
(called a doc-main-package from here on) for every -doc package. If they find such a doc-
main-package, they will now install the documentation into the path /usr/share/doc/doc-main-
package in the given doc package. I.e. the path can change but the documentation is still
shipped in the -doc package.

The --doc-main-package option can be used when the auto-detection is insufficient or to reset
the path to its previous value if there is a reason to diverge from Debian policy
recommendation.

Some documentation will not be affected by this change. These exceptions include the
copyright file, changelog files, README.Debian, etc. These files will still be installed in
the path /usr/share/doc/package.

- The dh_strip and dh_shlibdeps tools no longer uses filename patterns to determine which files
to process. Instead, they open the file and look for an ELF header to determine if a given
file is an shared object or an ELF executable.

This change may cause the tools to process more files than previously.

v10 Changes from v9 are:

- dh_installinit will no longer installs a file named debian/package as an init script.

- dh_installdocs will error out if it detects links created with --link-doc between packages of
architecture "all" and non-"all" as it breaks binNMUs.

- dh_installdeb no longer installs a maintainer-provided debian/package.shlibs file. This is
now done by dh_makeshlibs instead.

- dh_installwm refuses to create a broken package if no man page can be found (required to
register for the x-window-manager alternative).

- Debhelper will default to --parallel for all buildsystems that support parallel building.
This can be disabled by using either --no-parallel or passing --max-parallel with a value of
1.

- The dh command will not accept any of the deprecated "manual sequence control" parameters
(--before, --after, etc.). Please use override targets instead.

Retroactively applied to earlier compat levels: dh no longer accepts any of these since
debhelper/12.4.

- The dh command will no longer use log files to track which commands have been run. The dh
command still keeps track of whether it already ran the "build" sequence and skip it if it
did.

The main effects of this are:

- With this, it is now easier to debug the install or/and binary sequences because they can
now trivially be re-run (without having to do a full "clean and rebuild" cycle)

- The main caveat is that dh_* now only keeps track of what happened in a single override
target. When all the calls to a given dh_cmd command happens in the same override target
everything will work as before.

Example of where it can go wrong:

override_dh_foo:
dh_foo -pmy-pkg

override_dh_bar:
dh_bar
dh_foo --remaining

In this case, the call to dh_foo --remaining will also include my-pkg, since dh_foo
-pmy-pkg was run in a separate override target. This issue is not limited to
--remaining, but also includes -a, -i, etc.

- The dh_installdeb command now shell-escapes the lines in the maintscript config file. This
was the original intent but it did not work properly and packages have begun to rely on the
incomplete shell escaping (e.g. quoting file names).

- The dh_installinit command now defaults to --restart-after-upgrade. For packages needing the
previous behaviour, please use --no-restart-after-upgrade.

- The autoreconf sequence is now enabled by default. Please pass --without autoreconf to dh if
this is not desirable for a given package

- The systemd sequence is now enabled by default. Please pass --without systemd to dh if this
is not desirable for a given package.

- Retroactively removed: dh no longer creates the package build directory when skipping running
debhelper commands. This will not affect packages that only build with debhelper commands,
but it may expose bugs in commands not included in debhelper.

This compatibility feature had a bug since its inception in debhelper/9.20130516 that made it
fail to apply in compat 9 and earlier. As there has been no reports of issues caused by this
bug in those ~5 years, this item have been removed rather than fixed.

v9 Changes from v8 are:

- Multiarch support. In particular, dh_auto_configure passes multiarch directories to autoconf
in --libdir and --libexecdir.

- dh is aware of the usual dependencies between targets in debian/rules. So, "dh binary" will
run any build, build-arch, build-indep, install, etc targets that exist in the rules file.
There's no need to define an explicit binary target with explicit dependencies on the other
targets.

- dh_strip compresses debugging symbol files to reduce the installed size of -dbg packages.

- dh_auto_configure does not include the source package name in --libexecdir when using
autoconf.

- dh does not default to enabling --with=python-support

(Obsolete: As the dh_pysupport tool was removed from Debian stretch. Since debhelper/10.3,
dh no longer enables this sequence add-on regardless of compat level)

- All of the dh_auto_* debhelper programs and dh set environment variables listed by dpkg-
buildflags, unless they are already set.

- dh_auto_configure passes dpkg-buildflags CFLAGS, CPPFLAGS, and LDFLAGS to perl Makefile.PL
and Build.PL

- dh_strip puts separated debug symbols in a location based on their build-id.

- Executable debhelper config files are run and their output used as the configuration.

This mode is deprecated.

v8 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.

This mode is deprecated.

v7 This mode is deprecated.

This is the lowest supported compatibility level.

If you are upgrading from an earlier compatibility level, please review debhelper-obsolete-compat(7).

AUTHORS

       Niels Thykier <niels@thykier.net>

       Joey Hess

13.18ubuntu2.1                                     2024-10-18                                       debhelper(7)

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO

AUTHORS