[opensuse-buildservice] How can I configure download on demand to use an RPM repository?

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Francisco Javier Cuadrado

28 Sep 2010 28 Sep '10

10:03

Hi, all! I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository. My repository is a classic repomd, like the Fedora repository. Can anyone help me? Regards. [1] http://en.opensuse.org/openSUSE:Build_Service_Concept_CrossDevelopment -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

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Marcus Hüwe

28 Sep 28 Sep

10:24

On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

...

I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository.

My repository is a classic repomd, like the Fedora repository.

First you need to download the "primary.xml.gz" file. Afterwards uncompress it and store it to /srv/obs/build/<project>/<repo>/<arch>/:full/primary.xml Next you need to edit the project meta for instance via osc: "osc meta prj <project> -e" and add the following: <download baseurl="http://<url>/<path" metafile="primary.xml" mtype="rpmmd" arch="<arch>" /> Choose "<path>" so that the rpms are located in "http://<url>/<path>/<arch>/*" and "http://<url>/<path>/noarch/*". Also make sure that dod is enabled in /usr/lib/obs/server/BSConfig.pm: our $enable_download_on_demand = 1; Afterwards restart the scheduler. Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Robert Xu

16:14

On Tue, Sep 28, 2010 at 06:24, Marcus Hüwe wrote:

...

On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

...
I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository.

My repository is a classic repomd, like the Fedora repository.

First you need to download the "primary.xml.gz" file. Afterwards uncompress it and store it to /srv/obs/build/<project>/<repo>/<arch>/:full/primary.xml Next you need to edit the project meta for instance via osc: "osc meta prj <project> -e" and add the following:

<download baseurl="http://<url>/<path" metafile="primary.xml" mtype="rpmmd" arch="<arch>" />

Choose "<path>" so that the rpms are located in "http://<url>/<path>/<arch>/*" and "http://<url>/<path>/noarch/*".

Also make sure that dod is enabled in /usr/lib/obs/server/BSConfig.pm: our $enable_download_on_demand = 1;

Afterwards restart the scheduler.

This got my attention... So would this let us get RPMs that are continually updated, like from a repo such as Fedora Updates? -- later, Robert Xu -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Michael E Brown

16:31

On Tue, Sep 28, 2010 at 11:14:12AM -0500, Robert Xu wrote:

...

On Tue, Sep 28, 2010 at 06:24, Marcus Hüwe wrote:

...
On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

Afterwards restart the scheduler.

This got my attention...

So would this let us get RPMs that are continually updated, like from a repo such as Fedora Updates?

Absolutely not. In fact, this seriously breaks and wont work at all due to some limitations of DoD. The repo you pull from has to be completely static. The build service never re-downloads the repo metadata, and caches a lot of info. Basically, some fairly substantial changes need to be done to DoD to make this work. I think this is on the feature schedule, but people arent currently working on it. I had one of our interns look at it last summer, but he didnt get to it before he left because of other priority things he was working. -- Michael

Marcus Hüwe

29 Sep 29 Sep

09:42

On 2010-09-28 11:31:38 -0500, Michael E Brown wrote:

...

On Tue, Sep 28, 2010 at 11:14:12AM -0500, Robert Xu wrote:

...
On Tue, Sep 28, 2010 at 06:24, Marcus Hüwe wrote:

...
On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

Afterwards restart the scheduler.

This got my attention...

So would this let us get RPMs that are continually updated, like from a repo such as Fedora Updates?

Absolutely not. In fact, this seriously breaks and wont work at all due to some limitations of DoD. The repo you pull from has to be completely static. The build service never re-downloads the repo metadata, and caches a lot of info. Can you summarize which features do you miss? If I understand you correctly the obs should fetch the required metadata on its own?

In order to support non static metadata (without "hacks" like removing :full* and triggering a scanrepo event) we would just need to compare the old metadata with the new metadata and remove some entries from :full.solv (and their correspondent binaries from the :full/ dir). I think this shouldn't be too hard to implement:) Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Michael E Brown

18:57

On Wed, Sep 29, 2010 at 04:42:56AM -0500, Marcus Hüwe wrote:

...

On 2010-09-28 11:31:38 -0500, Michael E Brown wrote:

...
On Tue, Sep 28, 2010 at 11:14:12AM -0500, Robert Xu wrote:

...
On Tue, Sep 28, 2010 at 06:24, Marcus Hüwe wrote:

So would this let us get RPMs that are continually updated, like from a repo such as Fedora Updates?

Absolutely not. In fact, this seriously breaks and wont work at all due to some limitations of DoD. The repo you pull from has to be completely static. The build service never re-downloads the repo metadata, and caches a lot of info. Can you summarize which features do you miss? If I understand you correctly the obs should fetch the required metadata on its own?

Correct. Today you have to manually download primary.xml.gz and uncompress even though the information exists where OBS could/should get this itself. It should download repomd.xml and parse that to get the url for primary.xml.gz, then download/uncompress.

...

In order to support non static metadata (without "hacks" like removing :full* and triggering a scanrepo event) we would just need to compare the old metadata with the new metadata and remove some entries from :full.solv (and their correspondent binaries from the :full/ dir). I think this shouldn't be too hard to implement:)

Well, if you put it that way, maybe. But you still need to teach OBS to download the metadata in the first place. Pat Dignan wrote up a wiki page with the concept on it, which I cant lookup right now as I'm on my way to a meeting... -- Michael

Marcus Hüwe

3 Oct 3 Oct

19:57

On 2010-09-29 13:57:11 -0500, Michael E Brown wrote:

...

On Wed, Sep 29, 2010 at 04:42:56AM -0500, Marcus Hüwe wrote:

...
On 2010-09-28 11:31:38 -0500, Michael E Brown wrote:

...
On Tue, Sep 28, 2010 at 11:14:12AM -0500, Robert Xu wrote:

...
On Tue, Sep 28, 2010 at 06:24, Marcus Hüwe wrote:

So would this let us get RPMs that are continually updated, like from a repo such as Fedora Updates?

Absolutely not. In fact, this seriously breaks and wont work at all due to some limitations of DoD. The repo you pull from has to be completely static. The build service never re-downloads the repo metadata, and caches a lot of info. Can you summarize which features do you miss? If I understand you correctly the obs should fetch the required metadata on its own?

Correct. Today you have to manually download primary.xml.gz and uncompress even though the information exists where OBS could/should get this itself. It should download repomd.xml and parse that to get the url for primary.xml.gz, then download/uncompress.

...
In order to support non static metadata (without "hacks" like removing :full* and triggering a scanrepo event) we would just need to compare the old metadata with the new metadata and remove some entries from :full.solv (and their correspondent binaries from the :full/ dir). I think this shouldn't be too hard to implement:)

Well, if you put it that way, maybe. But you still need to teach OBS to download the metadata in the first place.

I just wrote a small patch to support the "update dod meta" feature. If you set up an initial dod repo the scheduler downloads the required metadata automatically. Additionally you can create a so called "refreshdodmeta" event so that the scheduler updates the dod metadata and cleans up the :full dir (removes unneeded binaries). TODO: * api support for the refreshdodmeta event (trivial) * add download support for susetags and debmd (probably also trivial) * support project meta changes (for instance update the dodmeta if the <download /> tag has changed, remove binaries if the <download /> tag is removed? etc.) Feedback, objections to the patch/the current design are welcome:) Marcus

Michael E Brown

4 Oct 4 Oct

15:29

On Sun, Oct 03, 2010 at 02:57:25PM -0500, Marcus Hüwe wrote:

...

...
I just wrote a small patch to support the "update dod meta" feature. If you set up an initial dod repo the scheduler downloads the required metadata automatically. Additionally you can create a so called "refreshdodmeta" event so that the scheduler updates the dod metadata and cleans up the :full dir (removes unneeded binaries).

TODO: * api support for the refreshdodmeta event (trivial) * add download support for susetags and debmd (probably also trivial) * support project meta changes (for instance update the dodmeta if the <download /> tag has changed, remove binaries if the <download /> tag is removed? etc.)

Feedback, objections to the patch/the current design are welcome:)

This is pretty nice. I'm due to rebuild my local dev instance, so I'll see if I can fit some time in to try this patch. It sounds workable for what we do, ie. cron rsync of update repos. We can update the repos and add a step to run the refresh OBS too. -- Michael

Martin Mohring

16:01

Michael E Brown wrote:

...

On Sun, Oct 03, 2010 at 02:57:25PM -0500, Marcus Hüwe wrote:

...
I just wrote a small patch to support the "update dod meta" feature. If you set up an initial dod repo the scheduler downloads the required metadata automatically. Additionally you can create a so called "refreshdodmeta" event so that the scheduler updates the dod metadata and cleans up the :full dir (removes unneeded binaries).

TODO: * api support for the refreshdodmeta event (trivial) * add download support for susetags and debmd (probably also trivial) * support project meta changes (for instance update the dodmeta if the <download /> tag has changed, remove binaries if the <download /> tag is removed? etc.)

Feedback, objections to the patch/the current design are welcome:)

This is pretty nice. I'm due to rebuild my local dev instance, so I'll see if I can fit some time in to try this patch. It sounds workable for what we do, ie. cron rsync of update repos. We can update the repos and add a step to run the refresh OBS too. -- Michael

I think you mean update support for susetags and debmd, basically DoD works for all 3 Meta Tag formats. -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Marcus Hüwe

18:44

On 2010-10-04 10:29:35 -0500, Michael E Brown wrote:

...

On Sun, Oct 03, 2010 at 02:57:25PM -0500, Marcus Hüwe wrote:

...
...
I just wrote a small patch to support the "update dod meta" feature. If you set up an initial dod repo the scheduler downloads the required metadata automatically. Additionally you can create a so called "refreshdodmeta" event so that the scheduler updates the dod metadata and cleans up the :full dir (removes unneeded binaries).

TODO: * api support for the refreshdodmeta event (trivial) * add download support for susetags and debmd (probably also trivial) * support project meta changes (for instance update the dodmeta if the <download /> tag has changed, remove binaries if the <download /> tag is removed? etc.)

Feedback, objections to the patch/the current design are welcome:)

This is pretty nice. I'm due to rebuild my local dev instance, so I'll see if I can fit some time in to try this patch. It sounds workable for what we do, ie. cron rsync of update repos. We can update the repos and add a step to run the refresh OBS too. Ok. To update the metadata simply call something like: curl -X POST -d '' 'http://<srcserver>/build/<project>?cmd=refreshdodmeta&repository=<repo>&nopackages=1' (you can also specify the arch with &arch=<myarch>).

Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Robert Xu

5 Oct 5 Oct

16:05

On Mon, Oct 4, 2010 at 14:44, Marcus Hüwe wrote:

...

On 2010-10-04 10:29:35 -0500, Michael E Brown wrote:

...
On Sun, Oct 03, 2010 at 02:57:25PM -0500, Marcus Hüwe wrote:

...
...
I just wrote a small patch to support the "update dod meta" feature. If you set up an initial dod repo the scheduler downloads the required metadata automatically. Additionally you can create a so called "refreshdodmeta" event so that the scheduler updates the dod metadata and cleans up the :full dir (removes unneeded binaries).

TODO: * api support for the refreshdodmeta event (trivial) * add download support for susetags and debmd (probably also trivial) * support project meta changes (for instance update the dodmeta if the <download /> tag has changed, remove binaries if the <download /> tag is removed? etc.)

Feedback, objections to the patch/the current design are welcome:)

This is pretty nice. I'm due to rebuild my local dev instance, so I'll see if I can fit some time in to try this patch. It sounds workable for what we do, ie. cron rsync of update repos. We can update the repos and add a step to run the refresh OBS too. Ok. To update the metadata simply call something like: curl -X POST -d '' 'http://<srcserver>/build/<project>?cmd=refreshdodmeta&repository=<repo>&nopackages=1' (you can also specify the arch with &arch=<myarch>).

Can this get merged into 2.1? -- later, Robert Xu -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Francisco Javier Cuadrado

4 Oct 4 Oct

11:30

Hi, again! 2010/9/28 Marcus Hüwe :

...

On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

...
I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository.

My repository is a classic repomd, like the Fedora repository.

First you need to download the "primary.xml.gz" file. Afterwards uncompress it and store it to /srv/obs/build/<project>/<repo>/<arch>/:full/primary.xml Next you need to edit the project meta for instance via osc: "osc meta prj <project> -e" and add the following:

<download baseurl="http://<url>/<path" metafile="primary.xml" mtype="rpmmd" arch="<arch>" />

Choose "<path>" so that the rpms are located in "http://<url>/<path>/<arch>/*" and "http://<url>/<path>/noarch/*".

I've got a new doubt about DoD. Can I have multiple primary files used into different download tags but for the same architecture? For example: http://repo-1/" metafile="primary-1.xml" arch="i586" ... /> http://repo-2/" metafile="primary-2.xml" arch="i586" ... /> And into /srv/obs/build/<project>/i586/:full I will have primary-1.xml and primary-2.xml files. So I can use multiple repositories for one architecture, in this case I know that there aren't duplicated packages, one repo doesn't contain any package which is into the other repo.

...

Also make sure that dod is enabled in /usr/lib/obs/server/BSConfig.pm: our $enable_download_on_demand = 1;

Afterwards restart the scheduler.

Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

-- Francisco Javier Cuadrado SPAIN-CHINA-HONG KONG-POLAND Spain Main: +34-910005436 Centro Empresarial Eisenhower C/ Cañada Real de Merinas, 25 Edificio 7 - oficina 1ºC 28042 Madrid http://www.iunika.com -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Marcus Hüwe

11:38

On 2010-10-04 13:30:15 +0200, Francisco Javier Cuadrado wrote:

...

2010/9/28 Marcus Hüwe :

...
On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

...
I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository.

My repository is a classic repomd, like the Fedora repository.

First you need to download the "primary.xml.gz" file. Afterwards uncompress it and store it to /srv/obs/build/<project>/<repo>/<arch>/:full/primary.xml Next you need to edit the project meta for instance via osc: "osc meta prj <project> -e" and add the following:

<download baseurl="http://<url>/<path" metafile="primary.xml" mtype="rpmmd" arch="<arch>" />

Choose "<path>" so that the rpms are located in "http://<url>/<path>/<arch>/*" and "http://<url>/<path>/noarch/*".

I've got a new doubt about DoD.

Can I have multiple primary files used into different download tags but for the same architecture? For example:

http://repo-1/" metafile="primary-1.xml" arch="i586" ... /> http://repo-2/" metafile="primary-2.xml" arch="i586" ... />

No that's not supported at the moment. In this case the scheduler will only consider the first <download /> tag. But you can "work around" it: - create a new project and add the second download tag to it - afterwards you can include the new repo in your first project via "<repository>..." Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Francisco Javier Cuadrado

13:19

2010/10/4 Marcus Hüwe :

...

On 2010-10-04 13:30:15 +0200, Francisco Javier Cuadrado wrote:

...
2010/9/28 Marcus Hüwe :

...
On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

...
I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository.

My repository is a classic repomd, like the Fedora repository.

First you need to download the "primary.xml.gz" file. Afterwards uncompress it and store it to /srv/obs/build/<project>/<repo>/<arch>/:full/primary.xml Next you need to edit the project meta for instance via osc: "osc meta prj <project> -e" and add the following:

<download baseurl="http://<url>/<path" metafile="primary.xml" mtype="rpmmd" arch="<arch>" />

Choose "<path>" so that the rpms are located in "http://<url>/<path>/<arch>/*" and "http://<url>/<path>/noarch/*".

I've got a new doubt about DoD.

Can I have multiple primary files used into different download tags but for the same architecture? For example:

http://repo-1/" metafile="primary-1.xml" arch="i586" ... /> http://repo-2/" metafile="primary-2.xml" arch="i586" ... />

No that's not supported at the moment. In this case the scheduler will only consider the first <download /> tag. But you can "work around" it: - create a new project and add the second download tag to it - afterwards you can include the new repo in your first project via "<repository>..."

Could this feature be implemented? It can be useful.

...

Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Marcus Rueckert

8 Oct 8 Oct

14:31

On 2010-10-04 15:19:24 +0200, Francisco Javier Cuadrado wrote:

...

Could this feature be implemented? It can be useful.

the solution provided by Marcus Hüwe would be cleaner imho. darix -- openSUSE - SUSE Linux is my linux openSUSE is good for you www.opensuse.org -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Robert Xu

16:32

On Fri, Oct 8, 2010 at 10:31, Marcus Rueckert wrote:

...

On 2010-10-04 15:19:24 +0200, Francisco Javier Cuadrado wrote:

...
Could this feature be implemented? It can be useful.

the solution provided by Marcus Hüwe would be cleaner imho.

Yes, can we get this merged somehow? Even build.o.o would be able to probably profit from this (like ex. Fedora update repos) (and hopefully get this into 2.1 before it is too late) -- later, Robert Xu -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Francisco Javier Cuadrado

18 Oct 18 Oct

09:08

2010/10/4 Marcus Hüwe :

...

On 2010-10-04 13:30:15 +0200, Francisco Javier Cuadrado wrote:

...
2010/9/28 Marcus Hüwe :

...
On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

...
I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository.

My repository is a classic repomd, like the Fedora repository.

First you need to download the "primary.xml.gz" file. Afterwards uncompress it and store it to /srv/obs/build/<project>/<repo>/<arch>/:full/primary.xml Next you need to edit the project meta for instance via osc: "osc meta prj <project> -e" and add the following:

<download baseurl="http://<url>/<path" metafile="primary.xml" mtype="rpmmd" arch="<arch>" />

Choose "<path>" so that the rpms are located in "http://<url>/<path>/<arch>/*" and "http://<url>/<path>/noarch/*".

I've got a new doubt about DoD.

Can I have multiple primary files used into different download tags but for the same architecture? For example:

http://repo-1/" metafile="primary-1.xml" arch="i586" ... /> http://repo-2/" metafile="primary-2.xml" arch="i586" ... />

No that's not supported at the moment. In this case the scheduler will only consider the first <download /> tag. But you can "work around" it: - create a new project and add the second download tag to it - afterwards you can include the new repo in your first project via "<repository>..."

Sorry for answering so late, but now I'm trying to create a project using that explanation and I don't know if I'm doing it wrong or I didn't understand you. I create a project with the following XML config: <download arch="i586" metafile="primary.xml" mtype="rpmmd" baseurl="......"/> <repository name="standard"> <path project="openSUSE.org:Fedora:12" repository="standard"/> <arch>i586</arch> </repository> But my project haven't got any build target, is my configuration wrong? Thanks again.

...

Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

Francisco Javier Cuadrado

09:12

2010/10/18 Francisco Javier Cuadrado :

...

2010/10/4 Marcus Hüwe :

...
On 2010-10-04 13:30:15 +0200, Francisco Javier Cuadrado wrote:

...
2010/9/28 Marcus Hüwe :

...
On 2010-09-28 12:03:58 +0200, Francisco Javier Cuadrado wrote:

...
I'm trying to configure an own RPM repository to use download on demand, but I don't know how to do it, because into the OBS wiki[1] there is only an example to use debian repository.

My repository is a classic repomd, like the Fedora repository.

First you need to download the "primary.xml.gz" file. Afterwards uncompress it and store it to /srv/obs/build/<project>/<repo>/<arch>/:full/primary.xml Next you need to edit the project meta for instance via osc: "osc meta prj <project> -e" and add the following:

<download baseurl="http://<url>/<path" metafile="primary.xml" mtype="rpmmd" arch="<arch>" />

Choose "<path>" so that the rpms are located in "http://<url>/<path>/<arch>/*" and "http://<url>/<path>/noarch/*".

I've got a new doubt about DoD.

Can I have multiple primary files used into different download tags but for the same architecture? For example:

http://repo-1/" metafile="primary-1.xml" arch="i586" ... /> http://repo-2/" metafile="primary-2.xml" arch="i586" ... />

No that's not supported at the moment. In this case the scheduler will only consider the first <download /> tag. But you can "work around" it: - create a new project and add the second download tag to it - afterwards you can include the new repo in your first project via "<repository>..."

Sorry for answering so late, but now I'm trying to create a project using that explanation and I don't know if I'm doing it wrong or I didn't understand you.

I create a project with the following XML config:

<download arch="i586" metafile="primary.xml" mtype="rpmmd" baseurl="......"/> <repository name="standard"> <path project="openSUSE.org:Fedora:12" repository="standard"/> <arch>i586</arch> </repository>

But my project haven't got any build target, is my configuration wrong?

Thanks again.

Sorry for my previous e-mail, but I only have to wait, and then my build target has appeared, I think OBS was updating something.

...

...
Marcus -- To unsubscribe, e-mail: opensuse-buildservice+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-buildservice+help@opensuse.org

-- Francisco Javier Cuadrado

SPAIN-CHINA-HONG KONG-POLAND

Spain Main: +34-910005436 Centro Empresarial Eisenhower C/ Cañada Real de Merinas, 25 Edificio 7 - oficina 1ºC 28042 Madrid

http://www.iunika.com

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participants (6)

Francisco Javier Cuadrado
Marcus Hüwe
Marcus Rueckert
Martin Mohring
Michael E Brown
Robert Xu