.. _coding-release-bugfix:

Create a patch on a release branch
==================================

.. code-block:: shell-session
   :caption: Clone repository

   # ------------------------------------------------
   # Clone a repostiory of interest (ex: votlha-lib-go)
   # Checkout release branch voltha-2.12 for patching
   # ------------------------------------------------
   % git clone "ssh://gerrit.opencord.org:29418/voltha-lib-go.git"
   % cd voltha-lib-go

   # Pull in all remote tags/branches
   % git fetch --all

.. code-block:: shell-session
   :caption: Create a dev branch for the patch

   # ----------------------------------
   # Display available release branches
   # ----------------------------------
   % git branch -a

     master
     remotes/origin/HEAD -> origin/master
     remotes/origin/master
     remotes/origin/voltha-2.11
     remotes/origin/voltha-2.12

   # ---------------------------------------
   # Create a dev branch anchored to release
   # ---------------------------------------
   % git checkout -b dev-joey voltha-2.12

.. code-block:: shell-session
   :caption: Sanity check branch parent

   # ----------------------------------------------------------------------
   # git --graph: Verify tag and branch values make sense:
   #   (HEAD -> dev-joey, tag: v2.12.0, origin/voltha-2.12)
   # ----------------------------------------------------------------------
   # Finding 'origin/master' as the ancestor for a release patch checkout
   # is a red flag something is amiss.
   # ----------------------------------------------------------------------

   % git log --graph --decorate --oneline $@
   * 653504fa (HEAD -> dev-joey, tag: v2.12.0, origin/voltha-2.12*) [VOL-5247] repo:voltha-go release patching prep

   % git branch -vv
   * dev-joey 253fa01b [origin/voltha-2.12: ahead 1] repo:voltha-go Post tag & branch activity
     help     253fa01b repo:voltha-go Post tag & branch activity
     master   4e0e0347 [origin/master] [VOL-5247] repo:voltha-go release patching prep

HEAD will be attached to origin/voltha-2.12 and the latest release tag v7.5.3

::

   git log --graph --decorate --oneline $@

   * aeb3c4f (HEAD -> voltha-2.12, tag: v7.5.3, origin/voltha-2.12) [VOL-5245] -- release patch
   * ad265dd (tag: v7.5.2) [VOL-5245] - branch and release repo:voltha-lib-go
   * 9cdee9f (tag: v7.5.1, tag: v2.12.0) [VOL-5245] branch and release repo:voltha-lib-go

.. code-block:: shell-session
   :caption: Sanity check dev sandbox attributes

   # ------------------------------------------------------
   # Sanity check your sanbox
   # ------------------------------------------------------
   #  1) VERSION file: no conflicts (master > release)
   #    master=x.y.0 > release=x.{y-1}.z
   % cat VERSION

   #  .gitreview - commit, rebase, merge will be applied to the release branch
   % grep -i branch .gitreview
   defaultbranch=master

   # ------------------------------------------------------
   # Or if something is amiss checkout by tag for diagnosis
   # ------------------------------------------------------
   % cat VERSION
   % git checkout tags/v{VERSION-FILE-STRING}

Command output

::
   % git checkout voltha-2.12
   Branch 'voltha-2.12' set up to track remote branch 'voltha-2.12' from 'origin'.
   Switched to a new branch 'voltha-2.12'


Edit and commit
---------------

.. code-block:: shell-session
   :caption: Edit, commit, rebase and review

   # ----------------------------------------------------------------
   # Edit sources to taste
   # ----------------------------------------------------------------
   {emacs,vi,$EDITOR} ...

   # :ref:`pull-request--commit-message`
   % git commit -F ./commit-message


Rebase against the release branch
---------------------------------

.. code-block:: shell-session
   :caption: Rebase against release branch ``NOT branch=master``

   # Run one of
   % git checkout voltha-2.12
   % git pull --ff-only origin voltha-2.12
   % git checkout dev-joey
   % git rebase -i "origin/voltha-2.12"


Code Review
-----------

.. code-block:: shell-session
   :caption: Push to gerrit, code review

   % git review --reviewers "foo@bar.org"


Verify Patch
------------

Now visit gerrit and verify your release bugfix is correctly decorated.
In gerrit, review the 'Repo|Branch' item in the top left corner.
'votlha-2.12' or the release tag will be visible.  If branch 'master' is
listed abandon the patch, it will not be applied to the proper branch.