Version-free download link for latest EMF snapshot

[trancexpress]

I'd like to be able to download the latest EMF snapshot without referring to any version.

E.g. there is this update site:

https://download.eclipse.org/modeling/emf/emf/builds/nightly/latest/

I can use e.g. p2 to mirror it locally, which is great, but requires an Eclipse installation.

Ideally there would be a redirect to the latest build, similar to the download button of the update site webpage. Currently, this download button leads to:

https://download.eclipse.org/modeling/emf/emf/builds/nightly/N202403141008/EMF-Updates-N202403141008.zip

It would be great to have something like this:

https://download.eclipse.org/modeling/emf/emf/builds/nightly/latest-snapshot/EMF-Updates-latest-snapshot.zip

[trancexpress]

Hi @merks ,

is there already a download link without a version string in it, for the latest EMF snapshot?

The background:

We do a latest integration build testing for Eclipse+xtext, one of the bits we need but don't build ourselves is EMF. We do download the snapshot (with plain wget) and distribute it internally.

Right now I'm reading the update site index.html to get the download link for the latest snapshot :( Since I can't rely on an Eclipse installation at a known location, to use p2. It would be great to just have one link for the snapshot, similar to how there is one update site for the latest EMF.

Best regards and thanks,
Simeon

[merks]

I'm not sure if there is a way to "implement" this without generating an additional update site zip with an fixed/known location. I'd like to avoid to generate such additional footprint.

I think something like this redirection approach only works in browsers but not with wget though I'm not sure:

https://stackoverflow.com/questions/5411538/how-to-redirect-one-html-page-to-another-on-load

PHP would work, but I don't want to introduce PHP where non exists already.

Note that the Eclipse Installer also contains the p2 mirror application:

https://download.eclipse.org/justj/?file=oomph/products

It exists at a fixed URI.

You could use it like this:

#!/bin/sh

wget -q -O application.zip https://download.eclipse.org/oomph/products/eclipse-inst-jre-win64.zip
unzip application.zip -d application

eclipse="application/eclipse-inst.exe"

if [[ $# != 2 ]]; then
  echo "mirror-eclipse <source-URL> <targetURL>"
else
 $eclipse -nosplash -verbose \
   -application org.eclipse.equinox.p2.artifact.repository.mirrorApplication \
   -source $1 \
   -destination $2
 $eclipse -nosplash -verbose \
   -application org.eclipse.equinox.p2.metadata.repository.mirrorApplication \
   -source $1 \
   -destination $2
fi

exit

That solution works for any update site.

Another fixed location is this one:

https://download.eclipse.org/modeling/emf/emf/builds/nightly/latest/compositeContent.jar

From that you can get the version number more directly and in a way that uses a known/fixed p2 representation:

$unzip -p compositeContent.jar compositeContent.xml | grep -Po "<child location='../(.*)'"
<child location='../N202403141008'

That version you can use to create the UR:

https://www.eclipse.org/downloads/download.php?file=/modeling/emf/emf/builds/nightly/${0}/EMF-Updates-${0}.zip

If someone wants something different, open to suggestions, but, as I said, I prefer not to maintain copies of files.

[trancexpress]

Alright, thank you. I'll leave it at HTML parsing, then eventually switch to parsing the compositeContent.xml as you suggest. Thanks!

[merks]

FYI, I'm asking the Foundation IT folks if there is some way to express a redirection that would work with wget/curl...