poky/documentation/ref-manual/migration-3.1.rst - mdmillerii/openbmc - Gitiles

 Moving to the Yocto Project 3.1 Release
 =======================================

 This section provides migration information for moving to the Yocto
 Project 3.1 Release from the prior release.

 .. _migration-3.1-minimum-system-requirements:

 Minimum system requirements
 ---------------------------

 The following versions / requirements of build host components have been
 updated:

 -  gcc 5.0

 -  python 3.5

 -  tar 1.28

 -  ``rpcgen`` is now required on the host (part of the ``libc-dev-bin``
    package on Ubuntu, Debian and related distributions, and the
    ``glibc`` package on RPM-based distributions).

 Additionally, the ``makeinfo`` and ``pod2man`` tools are *no longer*
 required on the host.

 .. _migration-3.1-mpc8315e-rdb-removed:

 mpc8315e-rdb machine removed
 ----------------------------

 The MPC8315E-RDB machine is old/obsolete and unobtainable, thus given
 the maintenance burden the ``mpc8315e-rdb`` machine configuration that
 supported it has been removed in this release. The removal does leave a
 gap in official PowerPC reference hardware support; this may change in
 future if a suitable machine with accompanying support resources is
 found.

 .. _migration-3.1-python-2-removed:

 Python 2 removed
 ----------------

 Due to the expiration of upstream support in January 2020, support for
 Python 2 has now been removed; it is recommended that you use Python 3
 instead. If absolutely needed there is a meta-python2 community layer
 containing Python 2, related classes and various Python 2-based modules,
 however it should not be considered as supported.

 .. _migration-3.1-reproducible-builds:

 Reproducible builds now enabled by default
 ------------------------------------------

 In order to avoid unnecessary differences in output files (aiding binary
 reproducibility), the Poky distribution configuration
 (``DISTRO = "poky"``) now inherits the ``reproducible_build`` class by
 default.

 .. _migration-3.1-ptest-feature-impact:

 Impact of ptest feature is now more significant
 -----------------------------------------------

 The Poky distribution configuration (``DISTRO = "poky"``) enables ptests
 by default to enable runtime testing of various components. In this
 release, a dependency needed to be added that has resulted in a
 significant increase in the number of components that will be built just
 when building a simple image such as core-image-minimal. If you do not
 need runtime tests enabled for core components, then it is recommended
 that you remove "ptest" from
 :term:`DISTRO_FEATURES` to save a significant
 amount of build time e.g. by adding the following in your configuration:
 ::

    DISTRO_FEATURES_remove = "ptest"

 .. _migration-3.1-removed-recipes:

 Removed recipes
 ---------------

 The following recipes have been removed:

 -  ``chkconfig``: obsolete

 -  ``console-tools``: obsolete

 -  ``enchant``: replaced by ``enchant2``

 -  ``foomatic-filters``: obsolete

 -  ``libidn``: no longer needed, moved to meta-oe

 -  ``libmodulemd``: replaced by ``libmodulemd-v1``

 -  ``linux-yocto``: drop 4.19, 5.2 version recipes (5.4 now provided)

 -  ``nspr``: no longer needed, moved to meta-oe

 -  ``nss``: no longer needed, moved to meta-oe

 -  ``python``: Python 2 removed (Python 3 preferred)

 -  ``python-setuptools``: Python 2 version removed (python3-setuptools
    preferred)

 -  ``sysprof``: no longer needed, moved to meta-oe

 -  ``texi2html``: obsolete

 -  ``u-boot-fw-utils``: functionally replaced by ``libubootenv``

 .. _migration-3.1-features-check:

 features_check class replaces distro_features_check
 ---------------------------------------------------

 The ``distro_features_check`` class has had its functionality expanded,
 now supporting ``ANY_OF_MACHINE_FEATURES``,
 ``REQUIRED_MACHINE_FEATURES``, ``CONFLICT_MACHINE_FEATURES``,
 ``ANY_OF_COMBINED_FEATURES``, ``REQUIRED_COMBINED_FEATURES``,
 ``CONFLICT_COMBINED_FEATURES``. As a result the class has now been
 renamed to ``features_check``; the ``distro_features_check`` class still
 exists but generates a warning and redirects to the new class. In
 preparation for a future removal of the old class it is recommended that
 you update recipes currently inheriting ``distro_features_check`` to
 inherit ``features_check`` instead.

 .. _migration-3.1-removed-classes:

 Removed classes
 ---------------

 The following classes have been removed:

 -  ``distutils-base``: moved to meta-python2

 -  ``distutils``: moved to meta-python2

 -  ``libc-common``: merged into the glibc recipe as nothing else used
    it.

 -  ``python-dir``: moved to meta-python2

 -  ``pythonnative``: moved to meta-python2

 -  ``setuptools``: moved to meta-python2

 -  ``tinderclient``: dropped as it was obsolete.

 .. _migration-3.1-src-uri-checksums:

 SRC_URI checksum behaviour
 --------------------------

 Previously, recipes by tradition included both SHA256 and MD5 checksums
 for remotely fetched files in :term:`SRC_URI`, even
 though only one is actually mandated. However, the MD5 checksum does not
 add much given its inherent weakness; thus when a checksum fails only
 the SHA256 sum will now be printed. The md5sum will still be verified if
 it is specified.

 .. _migration-3.1-npm:

 npm fetcher changes
 -------------------

 The npm fetcher has been completely reworked in this release. The npm
 fetcher now only fetches the package source itself and no longer the
 dependencies; there is now also an npmsw fetcher which explicitly
 fetches the shrinkwrap file and the dependencies. This removes the
 slightly awkward ``NPM_LOCKDOWN`` and ``NPM_SHRINKWRAP`` variables which
 pointed to local files; the lockdown file is no longer needed at all.
 Additionally, the package name in ``npm://`` entries in
 :term:`SRC_URI` is now specified using a ``package``
 parameter instead of the earlier ``name`` which overlapped with the
 generic ``name`` parameter. All recipes using the npm fetcher will need
 to be changed as a result.

 An example of the new scheme: ::

    SRC_URI = "npm://registry.npmjs.org;package=array-flatten;version=1.1.1 \\
               npmsw://${THISDIR}/npm-shrinkwrap.json"

 Another example where the sources are fetched from git rather than an npm repository: ::

    SRC_URI = "git://github.com/foo/bar.git;protocol=https \
               npmsw://${THISDIR}/npm-shrinkwrap.json"

 devtool and recipetool have also been updated to match with the npm
 fetcher changes. Other than producing working and more complete recipes
 for npm sources, there is also a minor change to the command line for
 devtool: the ``--fetch-dev`` option has been renamed to ``--npm-dev`` as
 it is npm-specific.

 .. _migration-3.1-packaging-changes:

 Packaging changes
 -----------------

 -  ``intltool`` has been removed from ``packagegroup-core-sdk`` as it is
    rarely needed to build modern software - gettext can do most of the
    things it used to be needed for. ``intltool`` has also been removed
    from ``packagegroup-core-self-hosted`` as it is not needed to for
    standard builds.

 -  git: ``git-am``, ``git-difftool``, ``git-submodule``, and
    ``git-request-pull`` are no longer perl-based, so are now installed
    with the main ``git`` package instead of within ``git-perltools``.

 -  The ``ldconfig`` binary built as part of glibc has now been moved to
    its own ``ldconfig`` package (note no ``glibc-`` prefix). This
    package is in the :term:`RRECOMMENDS` of the main
    ``glibc`` package if ``ldconfig`` is present in
    :term:`DISTRO_FEATURES`.

 -  ``libevent`` now splits each shared library into its own package (as
    Debian does). Since these are shared libraries and will be pulled in
    through the normal shared library dependency handling, there should
    be no impact to existing configurations other than less unnecessary
    libraries being installed in some cases.

 -  linux-firmware now has a new package for ``bcm4366c`` and includes
    available NVRAM config files into the ``bcm43340``, ``bcm43362``,
    ``bcm43430`` and ``bcm4356-pcie`` packages.

 -  ``harfbuzz`` now splits the new ``libharfbuzz-subset.so`` library
    into its own package to reduce the main package size in cases where
    ``libharfbuzz-subset.so`` is not needed.

 .. _migration-3.1-package-qa-warnings:

 Additional warnings
 -------------------

 Warnings will now be shown at ``do_package_qa`` time in the following
 circumstances:

 -  A recipe installs ``.desktop`` files containing ``MimeType`` keys but
    does not inherit the new ``mime-xdg`` class

 -  A recipe installs ``.xml`` files into ``${datadir}/mime/packages``
    but does not inherit the ``mime`` class

 .. _migration-3.1-x86-live-wic:

 ``wic`` image type now used instead of ``live`` by default for x86
 ------------------------------------------------------------------

 ``conf/machine/include/x86-base.inc`` (inherited by most x86 machine
 configurations) now specifies ``wic`` instead of ``live`` by default in
 :term:`IMAGE_FSTYPES`. The ``live`` image type will
 likely be removed in a future release so it is recommended that you use
 ``wic`` instead.

 .. _migration-3.1-misc:

 Miscellaneous changes
 ---------------------

 -  The undocumented ``SRC_DISTRIBUTE_LICENSES`` variable has now been
    removed in favour of a new ``AVAILABLE_LICENSES`` variable which is
    dynamically set based upon license files found in
    ``${COMMON_LICENSE_DIR}`` and ``${LICENSE_PATH}``.

 -  The tune definition for big-endian microblaze machines is now
    ``microblaze`` instead of ``microblazeeb``.

 -  ``newlib`` no longer has built-in syscalls. ``libgloss`` should then
    provide the syscalls, ``crt0.o`` and other functions that are no
    longer part of ``newlib`` itself. If you are using
    ``TCLIBC = "newlib"`` this now means that you must link applications
    with both ``newlib`` and ``libgloss``, whereas before ``newlib``
    would run in many configurations by itself.
	Moving to the Yocto Project 3.1 Release
	=======================================

	This section provides migration information for moving to the Yocto
	Project 3.1 Release from the prior release.

	.. _migration-3.1-minimum-system-requirements:

	Minimum system requirements
	---------------------------

	The following versions / requirements of build host components have been
	updated:

	- gcc 5.0

	- python 3.5

	- tar 1.28

	- ``rpcgen`` is now required on the host (part of the ``libc-dev-bin``
	package on Ubuntu, Debian and related distributions, and the
	``glibc`` package on RPM-based distributions).

	Additionally, the ``makeinfo`` and ``pod2man`` tools are no longer
	required on the host.

	.. _migration-3.1-mpc8315e-rdb-removed:

	mpc8315e-rdb machine removed
	----------------------------

	The MPC8315E-RDB machine is old/obsolete and unobtainable, thus given
	the maintenance burden the ``mpc8315e-rdb`` machine configuration that
	supported it has been removed in this release. The removal does leave a
	gap in official PowerPC reference hardware support; this may change in
	future if a suitable machine with accompanying support resources is
	found.

	.. _migration-3.1-python-2-removed:

	Python 2 removed
	----------------

	Due to the expiration of upstream support in January 2020, support for
	Python 2 has now been removed; it is recommended that you use Python 3
	instead. If absolutely needed there is a meta-python2 community layer
	containing Python 2, related classes and various Python 2-based modules,
	however it should not be considered as supported.

	.. _migration-3.1-reproducible-builds:

	Reproducible builds now enabled by default
	------------------------------------------

	In order to avoid unnecessary differences in output files (aiding binary
	reproducibility), the Poky distribution configuration
	(``DISTRO = "poky"``) now inherits the ``reproducible_build`` class by
	default.

	.. _migration-3.1-ptest-feature-impact:

	Impact of ptest feature is now more significant
	-----------------------------------------------

	The Poky distribution configuration (``DISTRO = "poky"``) enables ptests
	by default to enable runtime testing of various components. In this
	release, a dependency needed to be added that has resulted in a
	significant increase in the number of components that will be built just
	when building a simple image such as core-image-minimal. If you do not
	need runtime tests enabled for core components, then it is recommended
	that you remove "ptest" from
	:term:`DISTRO_FEATURES` to save a significant
	amount of build time e.g. by adding the following in your configuration:
	::

	DISTRO_FEATURES_remove = "ptest"

	.. _migration-3.1-removed-recipes:

	Removed recipes
	---------------

	The following recipes have been removed:

	- ``chkconfig``: obsolete

	- ``console-tools``: obsolete

	- ``enchant``: replaced by ``enchant2``

	- ``foomatic-filters``: obsolete

	- ``libidn``: no longer needed, moved to meta-oe

	- ``libmodulemd``: replaced by ``libmodulemd-v1``

	- ``linux-yocto``: drop 4.19, 5.2 version recipes (5.4 now provided)

	- ``nspr``: no longer needed, moved to meta-oe

	- ``nss``: no longer needed, moved to meta-oe

	- ``python``: Python 2 removed (Python 3 preferred)

	- ``python-setuptools``: Python 2 version removed (python3-setuptools
	preferred)

	- ``sysprof``: no longer needed, moved to meta-oe

	- ``texi2html``: obsolete

	- ``u-boot-fw-utils``: functionally replaced by ``libubootenv``

	.. _migration-3.1-features-check:

	features_check class replaces distro_features_check
	---------------------------------------------------

	The ``distro_features_check`` class has had its functionality expanded,
	now supporting ``ANY_OF_MACHINE_FEATURES``,
	``REQUIRED_MACHINE_FEATURES``, ``CONFLICT_MACHINE_FEATURES``,
	``ANY_OF_COMBINED_FEATURES``, ``REQUIRED_COMBINED_FEATURES``,
	``CONFLICT_COMBINED_FEATURES``. As a result the class has now been
	renamed to ``features_check``; the ``distro_features_check`` class still
	exists but generates a warning and redirects to the new class. In
	preparation for a future removal of the old class it is recommended that
	you update recipes currently inheriting ``distro_features_check`` to
	inherit ``features_check`` instead.

	.. _migration-3.1-removed-classes:

	Removed classes
	---------------

	The following classes have been removed:

	- ``distutils-base``: moved to meta-python2

	- ``distutils``: moved to meta-python2

	- ``libc-common``: merged into the glibc recipe as nothing else used
	it.

	- ``python-dir``: moved to meta-python2

	- ``pythonnative``: moved to meta-python2

	- ``setuptools``: moved to meta-python2

	- ``tinderclient``: dropped as it was obsolete.

	.. _migration-3.1-src-uri-checksums:

	SRC_URI checksum behaviour
	--------------------------

	Previously, recipes by tradition included both SHA256 and MD5 checksums
	for remotely fetched files in :term:`SRC_URI`, even
	though only one is actually mandated. However, the MD5 checksum does not
	add much given its inherent weakness; thus when a checksum fails only
	the SHA256 sum will now be printed. The md5sum will still be verified if
	it is specified.

	.. _migration-3.1-npm:

	npm fetcher changes
	-------------------

	The npm fetcher has been completely reworked in this release. The npm
	fetcher now only fetches the package source itself and no longer the
	dependencies; there is now also an npmsw fetcher which explicitly
	fetches the shrinkwrap file and the dependencies. This removes the
	slightly awkward ``NPM_LOCKDOWN`` and ``NPM_SHRINKWRAP`` variables which
	pointed to local files; the lockdown file is no longer needed at all.
	Additionally, the package name in ``npm://`` entries in
	:term:`SRC_URI` is now specified using a ``package``
	parameter instead of the earlier ``name`` which overlapped with the
	generic ``name`` parameter. All recipes using the npm fetcher will need
	to be changed as a result.

	An example of the new scheme: ::

	SRC_URI = "npm://registry.npmjs.org;package=array-flatten;version=1.1.1 \\
	npmsw://${THISDIR}/npm-shrinkwrap.json"

	Another example where the sources are fetched from git rather than an npm repository: ::

	SRC_URI = "git://github.com/foo/bar.git;protocol=https \
	npmsw://${THISDIR}/npm-shrinkwrap.json"

	devtool and recipetool have also been updated to match with the npm
	fetcher changes. Other than producing working and more complete recipes
	for npm sources, there is also a minor change to the command line for
	devtool: the ``--fetch-dev`` option has been renamed to ``--npm-dev`` as
	it is npm-specific.

	.. _migration-3.1-packaging-changes:

	Packaging changes
	-----------------

	- ``intltool`` has been removed from ``packagegroup-core-sdk`` as it is
	rarely needed to build modern software - gettext can do most of the
	things it used to be needed for. ``intltool`` has also been removed
	from ``packagegroup-core-self-hosted`` as it is not needed to for
	standard builds.

	- git: ``git-am``, ``git-difftool``, ``git-submodule``, and
	``git-request-pull`` are no longer perl-based, so are now installed
	with the main ``git`` package instead of within ``git-perltools``.

	- The ``ldconfig`` binary built as part of glibc has now been moved to
	its own ``ldconfig`` package (note no ``glibc-`` prefix). This
	package is in the :term:`RRECOMMENDS` of the main
	``glibc`` package if ``ldconfig`` is present in
	:term:`DISTRO_FEATURES`.

	- ``libevent`` now splits each shared library into its own package (as
	Debian does). Since these are shared libraries and will be pulled in
	through the normal shared library dependency handling, there should
	be no impact to existing configurations other than less unnecessary
	libraries being installed in some cases.

	- linux-firmware now has a new package for ``bcm4366c`` and includes
	available NVRAM config files into the ``bcm43340``, ``bcm43362``,
	``bcm43430`` and ``bcm4356-pcie`` packages.

	- ``harfbuzz`` now splits the new ``libharfbuzz-subset.so`` library
	into its own package to reduce the main package size in cases where
	``libharfbuzz-subset.so`` is not needed.

	.. _migration-3.1-package-qa-warnings:

	Additional warnings
	-------------------

	Warnings will now be shown at ``do_package_qa`` time in the following
	circumstances:

	- A recipe installs ``.desktop`` files containing ``MimeType`` keys but
	does not inherit the new ``mime-xdg`` class

	- A recipe installs ``.xml`` files into ``${datadir}/mime/packages``
	but does not inherit the ``mime`` class

	.. _migration-3.1-x86-live-wic:

	``wic`` image type now used instead of ``live`` by default for x86
	------------------------------------------------------------------

	``conf/machine/include/x86-base.inc`` (inherited by most x86 machine
	configurations) now specifies ``wic`` instead of ``live`` by default in
	:term:`IMAGE_FSTYPES`. The ``live`` image type will
	likely be removed in a future release so it is recommended that you use
	``wic`` instead.

	.. _migration-3.1-misc:

	Miscellaneous changes
	---------------------

	- The undocumented ``SRC_DISTRIBUTE_LICENSES`` variable has now been
	removed in favour of a new ``AVAILABLE_LICENSES`` variable which is
	dynamically set based upon license files found in
	``${COMMON_LICENSE_DIR}`` and ``${LICENSE_PATH}``.

	- The tune definition for big-endian microblaze machines is now
	``microblaze`` instead of ``microblazeeb``.

	- ``newlib`` no longer has built-in syscalls. ``libgloss`` should then
	provide the syscalls, ``crt0.o`` and other functions that are no
	longer part of ``newlib`` itself. If you are using
	``TCLIBC = "newlib"`` this now means that you must link applications
	with both ``newlib`` and ``libgloss``, whereas before ``newlib``
	would run in many configurations by itself.