Managing the Bazaar PPA
=======================

See also: `Bazaar Developer Document Catalog <index.html>`_.


Background
----------

We build Ubuntu ``.deb`` packages for Bazaar as an important part of the
release process.  These packages are hosted in a few `Personal Package
Archives (PPA)`__ on Launchpad.

  __ https://help.launchpad.net/PPAQuickStart

As of January 2011, there are the following PPAs:

<https://launchpad.net/~bzr/+archive/ppa>
    Final released versions and updates.
    Most users who want updates to bzr should add this.

<https://launchpad.net/~bzr/+archive/proposed>
    Proposed uploads to move into ~bzr/ppa, awaiting testing.

<https://launchpad.net/~bzr/+archive/obsolete>
    A preserved copy of the final version of packages from ~bzr/ppa for
    obsolete Ubuntu series.

<https://launchpad.net/~bzr/+archive/beta>
    Beta releases.

<https://launchpad.net/~bzr/+archive/beta-obsolete>
    A preserved copy of the final version of packages from
    ~bzr/beta for obsolete Ubuntu series.

<https://launchpad.net/~bzr/+archive/daily>
    Automatic nightly builds from trunk.

We build a distinct package for each distrorelease.
If you upload a release-specific version, you should add a suffix to the
package version, e.g. ``1.3-1~bazaar1~dapper1``.

Dapper uses the ``python-support`` framework and later distributions use
``python-central``.  This has little effect on everyday packaging but does
mean that some of the control files are quite different.

Beta releases of bzr and plugins are uploaded into the beta PPA.

Final release versions are first uploaded into the proposed PPA, which
serves as a staging area to allow for new packages to be tested, and also
so that a complete set of Bazaar core and plugin updated versions can be
prepared together, when negotiating an API version transition.

Once ready, packages can be copied from the proposed PPA to the main PPA
using the lp-promote-ppa script found within the hydrazine project.  This
procedure reduces the risk of broken packages or dependencies between
packages in the main PPA from which many people get bzr updates.

The packaging information is kept in branches of bzr on Launchpad, named
like
<https://code.launchpad.net/~bzr/ubuntu/hardy/bzr/bzr-ppa>.
or
<lp:~bzr/ubuntu/hardy/bzr/bzr-ppa>.  These branches are intended to be used
with the ``bzr-builddeb`` plugin.

The page <http://wiki.bazaar.canonical.com/PpaPackagingBranches> is a
reference to where the PPA packaging branches for each of the source
packages in the ``~bzr`` PPAs may be found.


Supported releases
------------------

We build packages for every supported Ubuntu release
<https://wiki.ubuntu.com/Releases>.  Packages need no longer be updated
when the release passes end-of-life because all users should
have upgraded by then.  

As of August 2010, the following releases are supported:

* Maverick 
* Lucid LTS
* Karmic
* Jaunty (support ends October 2010)
* Hardy LTS
* Dapper LTS (supported but no longer updated for new releases)

The ``rmadison bzr`` command will gives you an up-to-date summary
of which bzr releases are current in each Ubuntu release.

Preconditions
-------------

* You must have a Launchpad account and be a member of the team
  that owns these PPAs (``~bzr``).

* You must have a GPG key registered to your Launchpad account.

On reasonably recent versions of Ubuntu you no longer need special dput
configuration, because you can just say ::

  dput ppa:bzr/proposed source.changes
  

However, you may still want to add these lines to ``~/.dput.cf`` prevent 
inadvertently attempting to upload into Ubuntu or Debian, which will
give a somewhat unclear error::

    [DEFAULT]
    default_host_main = notspecified

* You need a Ubuntu (or probably Debian) machine, and ::

    sudo apt-get install build-essential devscripts dput quilt patch libcrypt-ssleay-perl debhelper cdbs python-docutils

  Please update this document if you encounter unmet dependencies or find a
  shorter way to express them.

* You will also want to have the `bzr-builddeb`_ plugin installed.

.. _`bzr-builddeb`: http://launchpad.net/bzr-builddeb


Packaging Bazaar
----------------

Overview of packaging with builddeb
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* First update the oldest supported branch, using ``bzr merge-upstream``.

* Run ``bzr builddeb -S -- -sa`` to build a source package, then put 
  that into the ppa.  
  
  (``-S`` says to make a source-only upload, which is
  required for Launchpad's builders.  ``-sa`` says to include the
  ``.orig.tgz`` even if this doesn't seem to be the first upload for an
  upstream release: this is often needed when rebuilding something that's
  previously been uploaded to Debian or Ubuntu or into a different PPA.)

* Now merge across that change into each supported branch with a 
  simple ``bzr merge``.
  
Locally testing using pbuilder
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

It may be useful to locally test builds inside pbuilder.  You may want to 
use the script from <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=255165> 
to wrap it, and to give it sensible defaults for your local machine.

Update all packages in proposed before copying to the main ppa
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

If one updates bzr, and there are plugins that are not compatible with the
new version of bzr, this can cause pain for users using the ppa. In order to
avoid this, we first get all packages up to date in the proposed ppa, and then
copy them to the main ppa.


Short form
~~~~~~~~~~

For people who have already set up everything they need, building the
release packages is as simple as::

  cd ~/dev/bzr/releases/packaging
  export VERSION="1.17~rc1-1~bazaar1"
  export PACKAGE="bzr"
  export UBUNTU_RELEASES="dapper hardy intrepid jaunty karmic"
  ~/dev/bzr/bzr.dev/tools/packaging/update-packaging-branches.sh
  * Optionaly merge debian unstable. 
  ~/dev/bzr/bzr.dev/tools/packaging/update-changelogs.sh
  ~/dev/bzr/bzr.dev/tools/packaging/update-control.sh 1.16 1.17 1.18
  ~/dev/bzr/bzr.dev/tools/packaging/build-packages.sh
  dput ppa:bzr/proposed ${PACKAGE}_$VERSION*.changes

Rinse and repeat for all the plugins by changing VERSION and PACKAGE.

Long Form
~~~~~~~~~

#. You will end up checking out a separate directory for each supported
   release. Such as ``~/dev/bzr/releases/packaging/hardy``. In each of these
   branches, you will produce the package for the release.

   The scripts will also create the branches and produce packages for
   bzrtools and bzr-svn.

#. Decide on the final version number.  It should be of this form::

     bzr-1.17~rc1-1~bazaar1~hardy1

   **Note:** There are three hyphen-separated parts: the *package name*,
   the *upstream version*, and the *packaging version*.

   **Caution:** Upstream betas or release candidates must insert a tilde
   to make them sort before the final release, like this:
   ``bzr-1.17~rc1-1~bazaar1~hardy1``.

   Final releases will use a release string of the form:
   ``bzr-1.17-1~bazaar1~hardy1``

   Set this base of this up as a usable environment variable::

      export VERSION="1.17~rc1-1~bazaar1"

#. Export the distroreleases that you will be packaging for::

      export UBUNTU_RELEASES="dapper hardy intrepid jaunty karmic"

#. Export the program you are packaging::

      export PACKAGE="bzr"

#. Checkout (or update) the packaging branch for each supported release::

      bzr co lp:~bzr/ubuntu/hardy/bzr/bzr-ppa

   There is a script available to help::

      tools/packaging/update-packaging-branches.sh

#. Optionaly, merge the Debian unstable branch into each of the packaging
   branches. You can find the Debian unstable branch here:
   http://bzr.debian.org/pkg-bazaar/

#. The ``bzr-builddeb`` step will download the original tarball if you do
   not already have it, putting it into a ``tarballs`` directory.

#. For Bazaar plugins, change the ``debian/control`` file to express a
   dependency on the correct version of ``bzr``.

   For bzrtools this is typically::

      Build-Depends-Indep: bzr (>= 1.17~), rsync
      Depends: ${python:Depends}, bzr (>= 1.17~), bzr (<< 1.18~), patch

   There is a helper script which will update the control file and commit it
   for all of your ``$UBUNTU_RELEASES``. It is available as::

    tools/packaging/update-control.sh

   You must supply the versions as arguments as follows
   OLD_VERSION CURRENT_VERSION NEXT_VERSION, such as::

    tools/packaging/update-control.sh 1.16 1.17 1.18

#. Make a new ``debian/changelog`` entry for the new release,
   either by using ``dch`` or just editing the file::

      dch -v '1.17~rc1-1~bazaar1~hardy1' -D hardy

   dch will default to the distro you're working in and this isn't checked
   against the version number (which is just our convention), so make sure
   to specify it.

   Make sure you have the correct email address for yourself (you may need
   export DEBEMAIL=`bzr whoami` if it isn't already set), version number, and
   distribution.  It should look something like this::

       bzr (1.17~rc1-1~bazaar1~hardy1) hardy; urgency=low

        * New upstream release.

       -- John Sample <sample@example.com>  Mon, 31 Mar 2008 12:36:27 +1100

   If you need to upload the package again to fix a problem, normally you
   should increment the last number in the version number, following the
   distro name.  Make sure not to omit the initial ``-1``, and make sure
   that the distro name in the version is consistent with the target name
   outside the parenthesis.

   You will also want to commit these changes into the packaging branch.

   There is a helper script which will build all the packages
   for all of your ``$UBUNTU_RELEASES``. It is available as::

      tools/packaging/update-changelogs.sh

#. Build the source packages::

      cd bzr-$DISTRO; bzr builddeb -S

   This will create a ``.changes`` file.  If you didn't configure builddeb
   to automatically sign them, you can use ::

      debsign -m$UID *.changes

   where ``$UID`` is the gpg key you want to use to sign the changes.

   There is a helper script which will build the package
   for all of your ``$UBUNTU_RELEASES``. It is available as::

      tools/packaging/build-packages.sh

#. Upload into the PPA for each release::

     dput dput ppa:bzr/proposed bzr*1.17-1*.changes

#. You should soon get an "upload accepted" mail from Launchpad, which
   means that your package is waiting to be built.  You can then track its
   progress in <https://launchpad.net/~bzr/+archive/proposed> and
   <https://launchpad.net/~bzr/+archive/proposed/+builds>.


Packaging bzr-svn
~~~~~~~~~~~~~~~~~

bzr-svn uses a packaging branch that contains both the source
(including any changes against upstream) and the ``debian/`` directory.

To build bzr-svn:

#. Get a checkout of ``lp:~bzr/bzr-svn/hardy-ppa/``

#. Merge from ``http://bzr.debian.org/pkg-bazaar/bzr-svn/unstable/``

   This should bring in both upstream and packaging changes for the new
   release, and it's updated as part of the bzr-svn release process.

   It's quite possible you will need to resolve some conflicts.

#. Run ``dch -v 0.4.15-1~bazaar1-hardy1 -D hardy`` or similar

#. Run ``bzr builddeb --source``

   bzr-builddeb will automatically check out the appropriate tag from the
   main branch of bzr-svn, build, and package it.

#. ``dput ppa:bzr/proposed ../bzr-svn_0.4.15-1~bazaar1~hardy1_source.changes``


Monitoring the contents of PPAs
-------------------------------

If you add all the bzr PPAs to your ``sources.list`` then you can see a
summary of current package versions with::

  apt-cache madison bzr
  
  
Testing the contents of the PPA
-------------------------------

A somewhat crude but useful way to test the contents of the PPA is to
install the relevant packages into an schroot::

 schroot -c hardy-test -u root -- \
   apt-get install -o 'APT::Install-Suggests="true"' \
   -o 'APT::Install-Recommends="true"' \
   bzr

This should make sure everything can be installed; it won't guarantee that 
  

Packaging dependencies
----------------------

Some of our updates to bzr in previous releases require backports of our
dependencies.  Specific branches holding these backports:

 * ``lp:~bzr/ubuntu/dapper/configobj/dapper-backport``
 * ``lp:~bzr/ubuntu/hardy/python-central-debhelper-sequence-addon/bzr-ppa``


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