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Sun, 17 March 2019 11:43

Eclipse User

I have an eclipse RCP product that is created using ANT scripts.

After building my product I find the following files:
- <exportFolder>/p2/org.eclipse.equinox.p2.engine/.settings/org.eclipse.equinox.p2.artifact.repository.prefs
- <exportFolder>/p2/org.eclipse.equinox.p2.engine/.settings/org.eclipse.equinox.p2.metadata.repository.prefs

My questions are:
1. What are those files used for?
2. Is there a settings that can be used to disable the generation of those files?
3. Is it okay to get rid of those files?

Re: p2 .settings [message #1804085 is a reply to message #1804073]

Mon, 18 March 2019 01:45

Eclipse User

It's not clear what your ANT scripts are using.

In any case, Those files look like preference files. Certainly the Eclipse packages you can download from https://www.eclipse.org/downloads/packages/ contain a p2 folder with such preferences in them but if you look at them closely much of that information is kind of bogus, e.g., the metadata looks like this:

eclipse.preferences.version=1
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/description=
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/enabled=true
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/isSystem=false
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/name=module-metadata-repository@/jobs/genie.packaging/simrel.epp-tycho-build/workspace/org.eclipse.epp.packages/packages/org.eclipse.epp.package.jee.product/target
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/provider=
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/suffix=p2content.xml
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/type=org.eclipse.tycho.repository.module.ModuleMetadataRepository
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/uri=file\:/jobs/genie.packaging/simrel.epp-tycho-build/workspace/org.eclipse.epp.packages/packages/org.eclipse.epp.package.jee.product/target/
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target/version=1.0.0
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target_targetPlatformRepository/enabled=true
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target_targetPlatformRepository/isSystem=false
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target_targetPlatformRepository/name=TychoTargetPlatform
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target_targetPlatformRepository/suffix=content.xml
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target_targetPlatformRepository/type=org.eclipse.equinox.internal.p2.metadata.repository.LocalMetadataRepository
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target_targetPlatformRepository/uri=file\:/jobs/genie.packaging/simrel.epp-tycho-build/workspace/org.eclipse.epp.packages/packages/org.eclipse.epp.package.jee.product/target/targetPlatformRepository/
repositories/file\:_jobs_genie.packaging_simrel.epp-tycho-build_workspace_org.eclipse.epp.packages_packages_org.eclipse.epp.package.jee.product_target_targetPlatformRepository/version=0.0.1
repositories/http\:__download.eclipse.org_eclipse_updates_4.9/count=1
repositories/http\:__download.eclipse.org_eclipse_updates_4.9/enabled=true
repositories/http\:__download.eclipse.org_eclipse_updates_4.9/isSystem=false
repositories/http\:__download.eclipse.org_eclipse_updates_4.9/nickname=The Eclipse Project Updates
repositories/http\:__download.eclipse.org_eclipse_updates_4.9/uri=http\://download.eclipse.org/eclipse/updates/4.9
repositories/http\:__download.eclipse.org_releases_2018-09/count=1
repositories/http\:__download.eclipse.org_releases_2018-09/enabled=true
repositories/http\:__download.eclipse.org_releases_2018-09/isSystem=false
repositories/http\:__download.eclipse.org_releases_2018-09/nickname=2018-09
repositories/http\:__download.eclipse.org_releases_2018-09/uri=http\://download.eclipse.org/releases/2018-09
repositories/http\:__download.eclipse.org_releases_latest/count=1
repositories/http\:__download.eclipse.org_releases_latest/enabled=false
repositories/http\:__download.eclipse.org_releases_latest/isSystem=false
repositories/http\:__download.eclipse.org_releases_latest/nickname=Latest Eclipse Release
repositories/http\:__download.eclipse.org_releases_latest/uri=http\://download.eclipse.org/releases/latest
repositories/http\:__download.eclipse.org_webtools_repository_photon/count=1
repositories/http\:__download.eclipse.org_webtools_repository_photon/enabled=true
repositories/http\:__download.eclipse.org_webtools_repository_photon/isSystem=false
repositories/http\:__download.eclipse.org_webtools_repository_photon/nickname=The Eclipse Web Tools Platform (WTP) software repository
repositories/http\:__download.eclipse.org_webtools_repository_photon/uri=http\://download.eclipse.org/webtools/repository/photon

These preferences will determine which update sites are known (and enabled) initially in Window -> Preferences -> Install/Update-> Available Software Sites. I assume the underlying framework removes "bogus" file locations in some magical way before displaying them to the user.

I doubt you can disable this generation.

I'm quite sure you can ship without these, but you might well want to ensure that the update site(s) for you product are specified here.

Re: p2 .settings [message #1804113 is a reply to message #1804085]

Mon, 18 March 2019 11:34

Eclipse User

Well, trying to verify what you just said I did the following:

Checked if the uri found in that file exists in Available Software Sites but it wasn't there
Tried modifying the value in the uri part of the file and check the Available Software Sites but nothing changed accordingly
Renamed the org.eclipse.equinox.p2.engine folder, started the tool found the following url in the update sites http://www.eclipse.org/modeling/updates/

I don't get what is it used for still.

Re: p2 .settings [message #1804126 is a reply to message #1804113]

Tue, 19 March 2019 01:39

Eclipse User

As I suggested, it's not strictly needed. The question of how it's used is not documented anywhere so nothing short of debugging what p2 does under the covers will answer that. Preferences are often stored in different scopes, i.e., project, instance (workspace), configuration, and profile, and lookup will often chain these scopes. These files are definitely p2 preferences, but how p2 looks up those preferences isn't entirely clear/obvious, and isn't documented as far as I know.

Re: p2 .settings [message #1804198 is a reply to message #1804126]

Wed, 20 March 2019 05:33

Eclipse User

Well, thanks a lot mate.

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