4. Getting the Source¶
4.1. Source package URLs¶
Bazaar provides some very nice shortcuts for accessing Launchpad’s source branches of packages in both Ubuntu and Debian.
To refer to source branches use:
ubuntu:package
where package refers to the package name you’re interested in. This URL refers to the package in the current development version of Ubuntu. To refer to the branch of Tomboy in the development version, you would use:
ubuntu:tomboy
To refer to the version of a source package in an older release of Ubuntu, just prefix the package name with the release’s code name. E.g. to refer to Tomboy’s source package in Saucy use:
ubuntu:saucy/tomboy
Since they are unique, you can also abbreviate the distro-series name:
ubuntu:s/tomboy
You can use a similar scheme to access the source branches in Debian, although there are no shortcuts for the Debian distro-series names. To access the Tomboy branch in the current development series for Debian use:
debianlp:tomboy
and to access Tomboy in Debian Wheezy use:
debianlp:wheezy/tomboy
4.2. Getting the source¶
Every source package in Ubuntu has an associated source branch on Launchpad. These source branches are updated automatically by Launchpad, although the process is not currently foolproof.
There are a couple of things that we do first in order to make the workflow more efficient later. Once you are used to the process you will learn when it makes sense to skip these steps.
4.2.2. Getting the trunk branch¶
We use the bzr branch command to create a local branch of the package. We’ll name the target directory tomboy.dev just to keep things easy to remember:
$ bzr branch ubuntu:tomboy tomboy.dev
The tomboy.dev directory represents the version of Tomboy in the development
version of Ubuntu, and you can always cd into this directory and do a bzr
pull to get any future updates.
4.2.3. Ensuring the version is up to date¶
When you do your bzr branch you will get a message telling you if the
packaging branch is up to date. For example:
$ bzr branch ubuntu:tomboy
Most recent Ubuntu version: 1.8.0-1ubuntu1.2
Packaging branch status: CURRENT
Branched 86 revisions.
Occasionally the importer fails and packaging branches do not match what is in the archive. A message saying:
Packaging branch status: OUT-OF-DATE
means the importer has failed. You can find out why on http://package-import.ubuntu.com/status/ and file a bug on the UDD project to get the issue resolved.
4.2.4. Upstream Tar¶
You can get the upstream tar by running:
bzr get-orig-source
This will try a number of methods to get the upstream tar, firstly by
recreating it from the upstream-x.y tag in the bzr archive, then by
downloading from the Ubuntu archive, lastly by running debian/rules
get-orig-source. The upstream tar will also be recreated when using bzr to
build the package:
bzr builddeb
The builddeb plugin has several configuration options.
4.2.5. Getting a branch for a particular release¶
When you want to do something like a stable release update (SRU), or you just want to examine the code in an old release, you’ll want to grab the branch corresponding to a particular Ubuntu release. For example, to get the Tomboy package for Quantal do:
$ bzr branch ubuntu:m/tomboy quantal
4.2.6. Importing a Debian source package¶
If the package you want to work on is available in Debian but not Ubuntu, it’s still easy to import the code to a local bzr branch for development. Let’s say you want to import the newpackage source package. We’ll start by creating a shared repository as normal, but we also have to create a working tree to which the source package will be imported (remember to cd out of the tomboy directory created above):
$ bzr init-repo newpackage
$ cd newpackage
$ bzr init debian
$ cd debian
$ bzr import-dsc http://ftp.de.debian.org/debian/pool/main/n/newpackage/newpackage_1.0-1.dsc
As you can see, we just need to provide the remote location of the dsc file, and Bazaar will do the rest. You’ve now got a Bazaar source branch.