migration-guides: prepare for release 3.5

(From yocto-docs rev: e0bef3c086645127b743d127b8f6e8925138b9dd)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 45 insertions, 0 deletions

diff --git a/documentation/migration-guides/index.rst b/documentation/migration-guides/index.rst
index 287b553195..6472cc2848 100644
--- a/documentation/migration-guides/index.rst
+++ b/documentation/migration-guides/index.rst
@@ -12,6 +12,7 @@ to move to one release of the Yocto Project from the previous one.
 .. toctree::
 
    migration-general
+   migration-3.5
    migration-3.4
    migration-3.3
    migration-3.2
diff --git a/documentation/migration-guides/migration-3.5.rst b/documentation/migration-guides/migration-3.5.rst
new file mode 100644
index 0000000000..bd807eb8c7
--- /dev/null
+++ b/documentation/migration-guides/migration-3.5.rst
@@ -0,0 +1,44 @@
+Release 3.5 (kirkstone)
+=======================
+
+This section provides migration information for moving to the Yocto
+Project 3.5 Release (codename "kirkstone") from the prior release.
+
+Recipe changes
+--------------
+
+- Because of the uncertainty in future default branch names in git repositories,
+  it is now required to add a branch name to all URLs described
+  by ``git://`` and ``gitsm://`` :term:`SRC_URI` entries. For example::
+
+     SRC_URI = "git://git.denx.de/u-boot.git;branch=master"
+
+  A :oe_git:`convert-srcuri </openembedded-core/tree/scripts/contrib/convert-srcuri.py>`
+  script to convert your recipes is available in :term:`OpenEmbedded-Core (OE-Core)`
+  and in :term:`Poky`.
+
+- Because of `GitHub dropping support for the git:
+  protocol <https://github.blog/2021-09-01-improving-git-protocol-security-github/>`__,
+  recipes now need to use ``;protocol=https`` at the end of GitHub
+  URLs. The same script as above can be used to convert the recipes.
+
+- The :term:`TOPDIR` variable and the current working directory are no longer modified
+  when parsing recipes. Any code depending on that behaviour will no longer work.
+
+- The ``append``, ``prepend`` and ``remove`` operators can now only be combined with
+  ``=`` and ``:=`` operators. To the exception of the ``append`` plus ``+=`` and
+  ``prepend`` plus ``=+`` combinations, all combinations could be factored up to the
+  ``append``, ``prepend`` or ``remove`` in the combination. This brought a lot of
+  confusion on how the override style syntax operators work and should be used.
+  Therefore, those combinations can simply be replaced by a single ``append``,
+  ``prepend`` or ``remove`` operator without any additional change.
+  For the ``append`` plus ``+=`` (and ``prepend`` plus ``=+``) combinations,
+  the content should be prefixed (respectively suffixed) by a space to maintain
+  the same behavior.  You can learn more about override style syntax operators
+  (``append``, ``prepend`` and ``remove``) in the BitBake documentation:
+  :ref:`bitbake:bitbake-user-manual/bitbake-user-manual-metadata:appending and prepending (override style syntax)`
+  and :ref:`bitbake:bitbake-user-manual/bitbake-user-manual-metadata:removal (override style syntax)`.
+
+- :ref:`allarch <ref-classes-allarch>` packagegroups can no longer depend on packages
+  which use :term:`PKG` renaming such as :ref:`debian.bbclass <ref-classes-debian>`.
+