ref-manual: Added the 2.2 Migration guide section.
(From yocto-docs rev: 668e32419ba59d975a196967e620c384009426a4) Signed-off-by: Scott Rifenbark <srifenbark@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
Richard Purdie
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commit
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</section>
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</section>
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<section id='moving-to-the-yocto-project-2.2-release'>
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<title>Moving to the Yocto Project 2.2 Release</title>
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<para>
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This section provides migration information for moving to the
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Yocto Project 2.2 Release from the prior release.
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</para>
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<section id='migration-2.2-minimum-kernel-version'>
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<para>
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The minimum kernel version is now 3.2.0, due to the upgrade
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to <filename>glibc 2.24</filename>.
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Specifically, for AArch64-based targets the version is
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3.14.
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For Nios II-based targets, the minimum kernel version is 3.19.
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<note>
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For x86 and x86_64, you can reset
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<link linkend='var-OLDEST_KERNEL'><filename>OLDEST_KERNEL</filename></link>
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to anything down to 2.6.32 if desired.
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</note>
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</para>
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</section>
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<section id='migration-2.2-staging-directories-in-sysroot-simplified'>
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<title>Staging Directories in Sysroot Has Been Simplified</title>
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<para>
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The way directories are staged in sysroot has been simplified and
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introduces the new
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<link linkend='var-SYSROOT_DIRS'><filename>SYSROOT_DIRS</filename></link>,
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<link linkend='var-SYSROOT_DIRS_NATIVE'><filename>SYSROOT_DIRS_NATIVE</filename></link>,
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and
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<link linkend='var-SYSROOT_DIRS_BLACKLIST'><filename>SYSROOT_DIRS_BLACKLIST</filename></link>.
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See the
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<ulink url='http://lists.openembedded.org/pipermail/openembedded-core/2016-May/121365.html'>v2 patch series on the OE-Core Mailing List</ulink>
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for additional information.
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</para>
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</section>
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<section id='migration-2.2-removal-of-old-images-from-tmp-deploy-now-enabled'>
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<title>Removal of Old Images and Other Files in <filename>tmp/deploy</filename> Now Enabled</title>
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<para>
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Removal of old images and other files in
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<filename>tmp/deploy/</filename> is now enabled by default due
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to a new staging method used for those files.
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As a result of this change, the
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<link linkend='var-RM_OLD_IMAGE'><filename>RM_OLD_IMAGE</filename></link>
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variable is now redundant.
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</para>
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</section>
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<section id='migration-2.2-bitbake-now-requires-python-3.4'>
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<title>BitBake Now Requires Python 3.4+</title>
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<para>
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BitBake requires Python 3.4 or greater.
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</para>
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</section>
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<section id='migration-2.2-metadata-now-must-use-python-3-syntax'>
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<title>Metadata Must Now Use Python 3 Syntax</title>
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<para>
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The metadata is now required to use Python 3 syntax.
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For help preparing metadata, see any of the many Python 3 porting
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guides available.
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Alternatively, you can reference the conversion commits for Bitbake
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and you can use OE-Core as a guide for changes.
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Following are particular areas of interest:
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<literallayout class='monospaced'>
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* subprocess command-line pipes needing locale decoding
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* the syntax for octal values changed
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* the <filename>iter*()</filename> functions changed name
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* iterators now return views
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* not lists
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* changed names for Python modules
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</literallayout>
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</para>
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</section>
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<section id='migration-2.2-target-python-recipes-switched-to-python-3'>
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<title>Target Python Recipes Switched to Python 3</title>
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<para>
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Most target Python recipes have now been switched to Python 3.
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Unfortunately, systems using RPM as a package manager and
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providing online package-manager support through SMART still
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require Python 2.
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</para>
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</section>
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<section id='migration-2.2-uclibc-replaced-by-musl'>
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<title>uClibc Replaced by musl</title>
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<para>
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Uclibc has been removed in favor of musl.
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</para>
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</section>
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<section id='migration-2.2-B-no-longer-default-working-directory-for-tasks'>
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<title><filename>${B}</filename> No Longer Default Working Directory for Tasks</title>
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<para>
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<filename>${</filename><link linkend='var-B'><filename>B</filename></link><filename>}</filename>
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is no longer the default working directory for tasks.
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Consequently, any custom tasks you define now need to either
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have the
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<filename>[</filename><ulink url='&YOCTO_DOCS_BB_URL;#variable-flags'><filename>dirs</filename></ulink><filename>]</filename> flag set, or the task needs to change into the
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appropriate working directory manually (e.g using
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<filename>cd</filename> for a shell task).
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<note>
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The preferred method is to use the
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<filename>[dirs]</filename> flag.
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</note>
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</para>
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</section>
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<section id='migration-2.2-utf-8-locale-required-on-build-host'>
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<title>UTF-8 Locale Required on Build Host</title>
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<para>
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A UTF-8 locale is required on the build host due to Python 3.
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Since C.UTF-8 is not a standard, the default is en_US.UTF-8.
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</para>
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</section>
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<section id='migration-2.2-runqemu-ported-to-python'>
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<title><filename>runqemu</filename> Ported to Python</title>
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<para>
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<filename>runqemu</filename> has been ported to Python and has
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changed behavior in some cases.
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</para>
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</section>
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<section id='migration-2.2-bitbake-changes'>
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<title>BitBake Changes</title>
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<para>
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The following changes took place for BitBake:
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<itemizedlist>
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<listitem><para>
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The "goggle" UI and standalone image-writer tool have
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been removed as they both require GTK+ 2.0 and
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were not being maintained.
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</para></listitem>
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<listitem><para>
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The Perforce fetcher now supports
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<link linkend='var-SRCREV'><filename>SRCREV</filename></link>
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for specifying the source revision to use, be it
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<filename>${</filename><link linkend='var-AUTOREV'><filename>AUTOREV</filename></link><filename>}</filename>,
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changelist number, p4date, or label, in preference to
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separate
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<link linkend='var-SRC_URI'><filename>SRC_URI</filename></link>
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parameters to specify these.
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This change is more in-line with how the other fetchers
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work for source control systems.
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Recipes that fetch from Perforce will need to be updated
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to use <filename>SRCREV</filename> in place of specifying
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the source revision within
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<filename>SRC_URI</filename>.
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</para></listitem>
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<listitem><para>
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Some of BitBake's internal code structures for storing the
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recipe cache needed to be changed to support the new
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multi-configuration functionality.
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These changes will affect external tools that use BitBake's
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tinfoil module.
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For information on these changes, see the changes made to
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the scripts supplied with OpenEmbedded-Core: 1 2.
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</para></listitem>
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<listitem><para>
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The task management code has been rewritten to avoid using
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ID indirection in order to improve performance.
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This change is unlikely to cause any problems for most
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users.
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However, the setscene verification function as pointed to
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by <filename>BB_SETSCENE_VERIFY_FUNCTION</filename>
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needed to change signature.
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Consequently, a new variable named
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<ulink url='&YOCTO_DOCS_BB_URL;#var-BB_SETSCENE_VERIFY_FUNCTION2'><filename>BB_SETSCENE_VERIFY_FUNCTION2</filename></ulink>
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has been added allowing multiple versions of BitBake
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to work with suitably written metadata, which includes
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OpenEmbedded-Core and Poky.
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Anyone with custom BitBake task scheduler code might also
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need to update the code to handle the new structure.
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</para></listitem>
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</itemizedlist>
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</para>
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</section>
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<section id='migration-2.2-swabber-has-been-removed'>
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<title>Swabber has Been Removed</title>
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<para>
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Swabber, a tool that was intended to detect host contamination in
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the build process, has been removed, as it has been unmaintained
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and unused for some time and was never particularly effective.
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The OpenEmbedded build system has since incorporated a number of
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mechanisms including enhanced QA checks that mean that there is
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less of a need for such a tool.
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</para>
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</section>
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<section id='migration-2.2-removed-recipes'>
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<title>Removed Recipes</title>
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<para>
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The following recipes have been removed:
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<itemizedlist>
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<listitem><para>
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<filename>augeas</filename>:
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No longer needed and has been moved to
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<filename>meta-oe</filename>.
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</para></listitem>
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<listitem><para>
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<filename>directfb</filename>:
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Unmaintained and has been moved to
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<filename>meta-oe</filename>.
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</para></listitem>
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<listitem><para>
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<filename>gcc</filename>:
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Removed 4.9 version.
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Versions 5.4 and 6.2 are still present.
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</para></listitem>
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<listitem><para>
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<filename>gnome-doc-utils</filename>:
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No longer needed.
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</para></listitem>
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<listitem><para>
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<filename>gtk-doc-stub</filename>:
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Replaced by <filename>gtk-doc</filename>.
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</para></listitem>
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<listitem><para>
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<filename>gtk-engines</filename>:
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No longer needed and has been moved to
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<filename>meta-gnome</filename>.
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</para></listitem>
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<listitem><para>
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<filename>gtk-sato-engine</filename>:
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Became obsolete.
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</para></listitem>
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<listitem><para>
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<filename>libglade</filename>:
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No longer needed and has been moved to
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<filename>meta-oe</filename>.
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</para></listitem>
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<listitem><para>
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<filename>libmad</filename>:
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Unmaintained and functionally replaced by
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<filename>libmpg123</filename>.
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<filename>libmad</filename> has been moved to
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<filename>meta-oe</filename>.
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</para></listitem>
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<listitem><para>
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<filename>libowl</filename>:
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Became obsolete.
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</para></listitem>
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<listitem><para>
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<filename>libxsettings-client</filename>:
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No longer needed.
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</para></listitem>
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<listitem><para>
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<filename>oh-puzzles</filename>:
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Functionally replaced by
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<filename>puzzles</filename>.
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</para></listitem>
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<listitem><para>
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<filename>oprofileui</filename>:
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Became obsolete.
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OProfile has been largely supplanted by perf.
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</para></listitem>
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<listitem><para>
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<filename>packagegroup-core-directfb.bb</filename>:
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Removed.
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</para></listitem>
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<listitem><para>
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<filename>core-image-directfb.bb</filename>:
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Removed.
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</para></listitem>
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<listitem><para>
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<filename>pointercal</filename>:
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No longer needed and has been moved to
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<filename>meta-oe</filename>.
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</para></listitem>
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<listitem><para>
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<filename>python-imaging</filename>:
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No longer needed and moved to
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<filename>meta-python</filename>
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</para></listitem>
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<listitem><para>
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<filename>python-pyrex</filename>:
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No longer needed and moved to
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<filename>meta-python</filename>.
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</para></listitem>
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<listitem><para>
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<filename>sato-icon-theme</filename>:
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Became obsolete.
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</para></listitem>
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<listitem><para>
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<filename>swabber-native</filename>:
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Swabber has been removed.
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See the
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<link linkend='migration-2.2-swabber-has-been-removed'>entry on Swabber</link>.
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</para></listitem>
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<listitem><para>
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<filename>tslib</filename>:
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No longer needed and has been moved to
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<filename>meta-oe</filename>.
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</para></listitem>
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<listitem><para>
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<filename>uclibc</filename>:
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Removed in favor of musl.
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</para></listitem>
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<listitem><para>
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<filename>xtscal</filename>:
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No longer needed and moved to
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<filename>meta-oe</filename>
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</para></listitem>
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</itemizedlist>
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</para>
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</section>
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<section id='migration-2.2-removed-classes'>
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<title>Removed Classes</title>
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<para>
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The following classes have been removed:
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<itemizedlist>
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<listitem><para>
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<filename>distutils-native-base</filename>:
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No longer needed.
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</para></listitem>
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<listitem><para>
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<filename>distutils3-native-base</filename>:
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No longer needed.
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</para></listitem>
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<listitem><para>
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<filename>sdl</filename>:
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Only set
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<link linkend='var-DEPENDS'><filename>DEPENDS</filename></link>
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and
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<link linkend='var-SECTION'><filename>SECTION</filename></link>,
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which are better set within the recipe instead.
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</para></listitem>
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<listitem><para>
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<filename>sip</filename>:
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Mostly unused.
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</para></listitem>
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<listitem><para>
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<filename>swabber</filename>:
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See the
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<link linkend='migration-2.2-swabber-has-been-removed'>entry on Swabber</link>.
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</para></listitem>
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</itemizedlist>
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</para>
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</section>
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<section id='migration-2.2-minor-packaging-changes'>
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<title>Minor Packaging Changes</title>
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<para>
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The following minor packaging changes have occurred:
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<itemizedlist>
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<listitem><para>
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<filename>grub</filename>:
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Split <filename>grub-editenv</filename> into its own
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package.
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</para></listitem>
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<listitem><para>
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<filename>systemd</filename>:
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Split container and vm related units into a new package,
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systemd-container.
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</para></listitem>
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<listitem><para>
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<filename>util-linux</filename>:
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Make <filename>prlimit</filename> a separate package.
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</para></listitem>
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</itemizedlist>
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</para>
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</section>
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<section id='migration-2.2-miscellaneous-changes'>
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<title>Miscellaneous Changes</title>
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<para>
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The following miscellaneous changes have occurred:
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<itemizedlist>
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<listitem><para>
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<filename>buildtools-tarball</filename>:
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Replaced <filename>nativesdk-python</filename>
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with <filename>nativesdk-python3</filename>.
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</para></listitem>
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<listitem><para>
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<filename>package_regex.inc</filename>:
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Removed deprecated file.
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</para></listitem>
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<listitem><para>
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<filename>recipetool</filename>:
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Set a fixed
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<link linkend='var-SRCREV'><filename>SRCREV</filename></link>
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by default when fetching from Git.
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</para></listitem>
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<listitem><para>
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<filename>devtool</filename>:
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Set a fixed
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<link linkend='var-SRCREV'><filename>SRCREV</filename></link>
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by default when fetching from Git.
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</para></listitem>
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<listitem><para>
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<filename>distcc</filename>:
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GTK+ UI is now disabled by default.
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</para></listitem>
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<listitem><para>
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<filename>packagegroup-core-tools-testapps</filename>:
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Removed Piglit.
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</para></listitem>
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<listitem><para>
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<filename>image.bbclass</filename>:
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Renamed COMPRESS(ION) to CONVERSION.
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</para></listitem>
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</itemizedlist>
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</para>
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</section>
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</section>
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</chapter>
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<!--
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vim: expandtab tw=80 ts=4
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