%poky; ] > This chapter provides information you can use to migrate work to a newer Yocto Project release. You can find the same information in the release notes for a given release.

This section provides migration information for moving to the Yocto Project 1.3 Release from the prior release.

Differences include changes for SSTATE_MIRRORS and bblayers.conf.

The shared state cache (sstate-cache), as pointed to by SSTATE_DIR, by default now has two-character subdirectories to prevent issues rising from too many files in the same directory. Also, native sstate-cache packages will go into a subdirectory named using the distro ID string. If you copy the newly structured sstate-cache to a mirror location (either local or remote) and then point to it in SSTATE_MIRRORS, you need to append "PATH" to the end of the mirror URL so that the path used by BitBake before the mirror substitution is appended to the path used to access the mirror. Here is an example: SSTATE_MIRRORS = "file://.* http://someserver.tld/share/sstate/PATH"

The meta-yocto layer consists of two parts that correspond to the Poky reference distribution and the reference hardware Board Support Packages (BSPs), respectively: meta-yocto and meta-yocto-bsp. When running BitBake or Hob for the first time after upgrading, your conf/bblayers.conf file will be updated to handle this change and you will be asked to re-run or restart for the changes to take effect.

Differences include changes for the following: Python function whitespace proto= in SRC_URI nativesdk Task recipes IMAGE_FEATURES Removed recipes

All Python functions must now use four spaces for indentation. Previously, an inconsistent mix of spaces and tabs existed, which made extending these functions using _append or _prepend complicated given that Python treats whitespace as syntactically significant. If you are defining or extending any Python functions (e.g. populate_packages, do_unpack, do_patch and so forth) in custom recipes or classes, you need to ensure you are using consistent four-space indentation.

Any use of proto= in SRC_URI needs to be changed to protocol=. In particular, this applies to the following URIs: svn:// bzr:// hg:// osc:// Other URIs were already using protocol=. This change improves consistency.

The suffix nativesdk is now implemented as a prefix, which simplifies a lot of the packaging code for nativesdk recipes. All custom nativesdk recipes and any references need to be updated to use nativesdk-* instead of *-nativesdk.

"Task" recipes are now known as "Package groups" and have been renamed from task-*.bb to packagegroup-*.bb. Existing references to the previous task-* names should work in most cases as there is an automatic upgrade path for most packages. However, you should update references in your own recipes and configurations as they could be removed in future releases. You should also rename any custom task-* recipes to packagegroup-*, and change them to inherit packagegroup instead of task, as well as taking the opportunity to remove anything now handled by packagegroup.bbclass, such as providing -dev and -dbg packages, setting LIC_FILES_CHKSUM, and so forth. See the "Package Groups - packagegroup.bbclass" section for further details.

Image recipes that previously included "apps-console-core" in IMAGE_FEATURES should now include "splash" instead to enable the boot-up splash screen. Retaining "apps-console-core" will still include the splash screen but generates a warning. The "apps-x11-core" and "apps-x11-games" IMAGE_FEATURES features have been removed.

The following recipes have been removed. For most of them, it is unlikely that you would have any references to them in your own Metadata. However, you should check your metadata against this list to be sure: libx11-trim: Replaced by libx11, which has a negligible size difference with modern Xorg. xserver-xorg-lite: Use xserver-xorg, which has a negligible size difference when DRI and GLX modules are not installed. xserver-kdrive: Effectively unmaintained for many years. mesa-xlib: No longer serves any purpose. galago: Replaced by telepathy. gail: Functionality was integrated into GTK+ 2.13. eggdbus: No longer needed. gcc-*-intermediate: The build has been restructured to avoid the need for this step. libgsmd: Unmaintained for many years. Functionality now provided by ofono instead. contacts, dates, tasks, eds-tools: Largely unmaintained PIM application suite. It has been moved to meta-gnome in meta-openembedded. In addition to the previously listed changes, the meta-demoapps directory has also been removed because the recipes in it were not being maintained and many had become obsolete or broken. Additionally, these recipes were not parsed in the default configuration. Many of these recipes are already provided in an updated and maintained form within the OpenEmbedded community layers such as meta-oe and meta-gnome. For the remainder, you can now find them in the meta-extras repository, which is in the Yocto Project Source Repositories.

This section provides migration information for moving to the Yocto Project 1.4 Release from the prior release.

Differences include the following: Comment Continuation: If a comment ends with a line continuation (\) character, then the next line must also be a comment. Any instance where this is not the case, now triggers a warning. You must either remove the continuation character, or be sure the next line is a comment. Package Name Overrides: The runtime package specific variables RDEPENDS, RRECOMMENDS, RSUGGESTS, RPROVIDES, RCONFLICTS, RREPLACES, FILES, ALLOW_EMPTY, and the pre, post, install, and uninstall script functions pkg_preinst, pkg_postinst, pkg_prerm, and pkg_postrm should always have a package name override. For example, use RDEPENDS_${PN} for the main package instead of RDEPENDS. BitBake uses more strict checks when it parses recipes.

Differences include the following: Shared State Code: The shared state code has been optimized to avoid running unnecessary tasks. For example, bitbake -c rootfs some-image from shared state no longer populates the target sysroot since that is not necessary. Instead, the system just needs to extract the output package contents, re-create the packages, and construct the root filesystem. This change is unlikely to cause any problems unless you have missing declared dependencies. Scanning Directory Names: When scanning for files in SRC_URI, the build system now uses FILESOVERRIDES instead of OVERRIDES for the directory names. In general, the values previously in OVERRIDES are now in FILESOVERRIDES as well. However, if you relied upon an additional value you previously added to OVERRIDES, you might now need to add it to FILESOVERRIDES unless you are already adding it through the MACHINEOVERRIDES or DISTROOVERRIDES variables, as appropriate.

A new oe-git-proxy script has been added to replace previous methods of handling proxies and fetching source from Git. See the meta-yocto/conf/site.conf.sample file for information on how to use this script.

Support for remote debugging with the Eclipse IDE is now separated into an image feature (eclipse-debug) that corresponds to the packagegroup-core-eclipse-debug package group. Previously, the debugging feature was included through the tools-debug image feature, which corresponds to the packagegroup-core-tools-debug package group.

The SANITY_TESTED_DISTROS variable now uses a distribution ID, which is composed of the host distributor ID followed by the release. Previously, it was composed of the description field. For example, "Ubuntu 12.10" becomes "Ubuntu-12.10". You do not need to worry about this change if you are not specifically setting this variable, or if you are specifically setting it to "".

If runtime package management is enabled and the RPM backend is selected, Smart is now installed for package download, dependency resolution, and upgrades instead of Zypper. For more information on how to use Smart, run the following command on the target: smart --help

The following recipes were moved from their previous locations because they are no longer used by anything in the OpenEmbedded-Core: clutter-box2d: Now resides in the meta-oe layer. evolution-data-server: Now resides in the meta-gnome layer. gthumb: Now resides in the meta-gnome layer. gtkhtml2: Now resides in the meta-oe layer. gupnp: Now resides in the meta-multimedia layer. gypsy: Now resides in the meta-oe layer. libcanberra: Now resides in the meta-gnome layer. libgdata: Now resides in the meta-gnome layer. libmusicbrainz: Now resides in the meta-multimedia layer. metacity: Now resides in the meta-gnome layer. polkit: Now resides in the meta-oe layer. zeroconf: Now resides in the meta-networking layer.

The following list shows what has been removed or renamed: evieext: Removed because it has been removed from xserver since 2008. Gtk+ DirectFB: Removed support because upstream Gtk+ no longer supports it as of version 2.18. libxfontcache / xfontcacheproto: Removed because they were removed from the Xorg server in 2008. libxp / libxprintapputil / libxprintutil / printproto: Removed because the XPrint server was removed from Xorg in 2008. libxtrap / xtrapproto: Removed because their functionality was broken upstream. linux-yocto 3.0 kernel: Removed with linux-yocto 3.8 kernel being added. The linux-yocto 3.2 and linux-yocto 3.4 kernels remain as part of the release. lsbsetup: Removed with functionality now provided by lsbtest. matchbox-stroke: Removed because it was never more than a proof-of-concept. matchbox-wm-2 / matchbox-theme-sato-2: Removed because they are not maintained. However, matchbox-wm and matchbox-theme-sato are still provided. mesa-dri: Renamed to mesa. mesa-xlib: Removed because it was no longer useful. mutter: Removed because nothing ever uses it and the recipe is very old. orinoco-conf: Removed because it has become obsolete. update-modules: Removed because it is no longer used. The kernel module postinstall and postrm scripts can now do the same task without the use of this script. web: Removed because it is not maintained. Superseded by web-webkit. xf86bigfontproto: Removed because upstream it has been disabled by default since 2007. Nothing uses xf86bigfontproto. xf86rushproto: Removed because its dependency in xserver was spurious and it was removed in 2005. zypper / libzypp / sat-solver: Removed and been functionally replaced with Smart (python-smartpm) when RPM packaging is used and package management is enabled on the target.