(First run through, only got halfway)
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This page documents how to use the [https// openSUSE Build Service] with Mer.
This page documents how to use the [ openSUSE Build Service] with Mer.
== Installing OBS tools locally ==
== Installing OBS tools locally ==

Revision as of 08:33, 18 April 2009

This page documents how to use the openSUSE Build Service with Mer.


Installing OBS tools locally

You'll need an account with Novell

Assuming a Debian or Ubuntu development box locally:

To get the OBS tools repository add one of the following lines:

deb /


deb /

to a new file called:



apt-get update
apt-get install osc build qemu

(may have to use aptitude to install the right qemu - it's version 0.9.2svn6094-1 as of 12 April 2009)

(may have to ask on #mer to install the right build - it's version 02009.03.08.6740S as of 12 April 2009 )

(Note, 64 bit systems will need to download manually using wget from as the openSUSE repo may have some packaging issues)



and enter username/passwd when prompted (note these are stored in cleartext in the config file). Note this isn't supposed to do anything (it prints out the osc help) but it stores your name/pw for future use.

Go and login.

Make sure you click the "let me build packages" button.

There is a link to 'Home Project' on the left, follow this and enter a description.

Local osc setup

You can now check some settings in your ~/.oscrc :

This is the OBS builder we're using... maybe we'll use a instance one day?

apiurl =

This specifies where all the cached binary packages are held to create a chroot build environment. Around 300MB.

packagecachedir = /home/lbt/maemo/Mer/obs/.pkg-cache/

This specifies the default location where a complete chroot build will be installed. This will be a minimal OS install - allow 400MB minimum.

build-root = /home/lbt/maemo/Mer/obs/build-%(repo)s-%(arch)s

The next section is credentials for access control to the builder.

user = <username>
pass = <password>

Getting Mer and Packages

Create and cd to a directory to act as the root for the OBS/Mer repository. You'll need space to have a copy of various Mer source packages - around 650MB

cd /home/lbt/maemo/Mer/obs

Note that you need to use "home:lbt:Mer" in the osc commands (until Mer is made a main project).

Now osc ls home:lbt:Mer:0.11 will list all the packages.

If you want the entire Mer project then you can run osc co home:lbt:Mer:0.11 to checkout the entire project as tar.gz and .dsc files, or to get just one package osc co home:lbt:Mer:0.11/<package>

Building a package locally

(Note: if you have Scratchbox then you may need to see the section below on temporarily disabling it)

To work on a package go to the right location and get the source.

osc co home:lbt:Mer:0.11/maemopad
cd home:lbt:Mer:0.11/maemopad         # ie <osc project dir>
osc up
osc build --clean standard armv5el   maemopad*.dsc         # ie <project.dsc>

This will download all the (arm) debs to create a local chroot - it'll take a while the first time but will use a cache after that.

Eventually it will prompt you for the root passwd in order to chroot etc. After that the builder will su to the "abuild" user (uid:gid 399:399) and build the code.

If you like you can work inside qemu chroot:

chroot /home/lbt/maemo/Mer/obs/build-standard-armv5el su abuild                # this is the dir you set in .oscrc as the build-root.
cd /usr/src/packages/BUILD

at this point:


etc... all work using the binfmt_misc redirection.

To create a new package

These osc commands are done in your own area - use your username after "home:"


osc meta pkg -e home:<username> <package>

This pops up an editor where you can edit the name/description and then save. This will tell the OBS server about the package.

To get a local (empty) copy run

osc up

This makes a package directory so now you can:

cp package.tar.gz package.dsc homt:lbt/package
cd package

Then add them to version control

osc addremove

and upload them

osc commit

To watch what is going on:

osc buildlog <target>


osc buildlog Debian_5.0 i586

This does something like a "tail -f" of the Xen builder.

Standalone Project

On the web, create the (sub)project maemopad.

In the repository section add a repository and from advanced select the Mer project: home:lbt:Mer:011

Now we need to pick build targets:

And pick one or two ( I picked Debian Lenny and Ubuntu 8.10) This creates a standalone project and builds against another project

Goto your obs base (eg /scratch3/maemo/Mer/obs) and checkout the project:

 osc co home:lbt:maemopad

Now create the package metadata:

 osc meta pkg -e home:lbt:maemopad maemopad

and get a local copy (empty still):

 cd home:lbt:maemopad/
 osc up

the 'osc up' created a directory so go into it and get the source:

  cd maemopad/

Use the cheap'n'cheerful 'register all file adds and removes with vc'-command:

 osc addremove

and then commit the source which uploads it to the OBS

 osc commit -m "added source"

This will trigger a rebuild and you can access the logs.

Co-existing with Scratchbox

If you use the OBS local build facility and the scratchbox-1 local builder then you need to know how to teach the two emulators how to co-exist.

Both OBS and Scratchbox use | binfmt_misc to cause the kernel to invoke (in our case) qemu when it comes across an armel binary.

To disable qemu and enable sbox

 echo 0 > /proc/sys/fs/binfmt_misc/arm
 echo 0 > /proc/sys/fs/binfmt_misc/armeb
 echo 1 > /proc/sys/fs/binfmt_misc/sbox-arm
 echo 1 > /proc/sys/fs/binfmt_misc/sbox-armeb

To disable sbox and enable arm

 echo 1 > /proc/sys/fs/binfmt_misc/arm
 echo 1 > /proc/sys/fs/binfmt_misc/armeb
 echo 0 > /proc/sys/fs/binfmt_misc/sbox-arm
 echo 0 > /proc/sys/fs/binfmt_misc/sbox-armeb

Don't do this whilst a build is in progress!


To link to a source create a _link file containing:

 <link project="linked project name" package="linked package name">


   <apply name="name of the first patch" />

Sadly these patches apply to the files in the source; so this means you need to apply the diff to the maemo-ised diff file.


In the following, Mer environment is defined as the sum of packages with Ubuntu packages, with Mer repository overlaid on top, not what is built in a 'Mer' project.

1. A lone developer sits down and decides to create a project. He assigns a package name to this and his name as maintainer. He builds it locally for Mer and tries it out as he develops it through dpkg-buildpackage'ing (or osc build?) locally and testing his package. He finishes his release, and dpkg-buildpackage -S -us -uc, generating a .dsc and tar.gz. He would like to build his package for the Mer environment, the X86 and ARMEL targets. He doesn't want to maintain a local toolchain beyond his x86 VMDK, so he submits the build job to the OpenSUSE Build Service (which he has registered with). He can then observe the build progress and he can subsequently download resulting .deb(s) and .changes file to upload to the Mer (Extras) repository.

2. Variation on the first but with OpenSUSE Build Service located on

3. A company developer sits down and creates a project. He takes this source from a company source code repository, assigns a package name and setting his name as maintainer. He builds it locally for Mer and tries it out as he develops it through dpkg-buildpackage'ing (or osc build?) locally and testing his package. He generates a release (generating a .dsc and tar.gz) and he would like to target Mer environment, and Ubuntu, the X86 and ARMEL targets. He would like to build locally on his VMDK, as the source code should never leave the company premises. He can then watch the build progress and subsequently gets the resulting .deb(s) and .changes, to be able to upload. He should not need a login at all to build locally

4. Same as 3, but is okay to need a login, it is assumed there is a OBS Server appliance with build workers in the company.

Naming and Deltas

Mer is derived from Ubuntu with the intial releases being based on Jaunty.

This means that in general you get Ubuntu packages.

In OBS terms, Mer builds against Ubuntu Jaunty (ie build-dependencies are met from Jaunty)

However, Maemo provides some excellent libraries, UIs and applications that Mer will use.

So Mer is "linked to" the OBS Maemo project (which just contains an upload of the Maemo source)

mer=orig+delta(deb)+delta(maemo)+delta(mer) mer!=orig+delta(deb+maemo+mer)