Update OML's target platform to use latest version of published features

[NicolasRouquette]

Summary

It seems that Maven/Tycho fails during 'computing target platform for a MavenProject' where the target definition refers to a version of a feature that is no longer the latest version available.

Details

The target definition for OML is located here: gov.nasa.jpl.imce.oml.target.target

This target definition includes the following:

<location includeAllPlatforms="false" includeConfigurePhase="true" includeMode="planner" includeSource="true" type="InstallableUnit">
<unit id="org.eclipse.e4.core.tools.feature.source.feature.group" version="4.7.0.v20170515-1617"/>
<unit id="org.eclipse.e4.rcp.feature.group" version="1.6.1.v20170829-0553"/>
<unit id="org.eclipse.e4.rcp.source.feature.group" version="1.6.1.v20170829-0553"/>
...
<repository location="http://download.eclipse.org/releases/oxygen/"/>
</location>

This worked in 2017; however, a recent build in January 2018 failed to resolve this feature:

[INFO] Computing target platform for MavenProject: gov.nasa.jpl.imce.oml:gov.nasa.jpl.imce.oml.uuid:0.9.0-SNAPSHOT @ /root/sources/plugins/core/gov.nasa.jpl.imce.oml.uuid/.polyglot.build.properties
[INFO] Adding repository http://download.eclipse.org/sirius/updates/releases/5.0.1/oxygen
[INFO] Adding repository http://download.eclipse.org/tools/orbit/R-builds/R20170516192513/repository
[INFO] Adding repository http://download.eclipse.org/releases/oxygen
[ERROR] Failed to resolve target definition /root/sources/releng/gov.nasa.jpl.imce.oml.target/gov.nasa.jpl.imce.oml.target.target: Could not find "org.eclipse.e4.rcp.feature.group/1.6.1.v20170829-0553" in the repositories of the current location -> [Help 1]
[ERROR] Failed to resolve target definition /root/sources/releng/gov.nasa.jpl.imce.oml.target/gov.nasa.jpl.imce.oml.target.target: Could not find "org.eclipse.e4.rcp.feature.group/1.6.1.v20170829-0553" in the repositories of the current location -> [Help 1]
org.apache.maven.MavenExecutionException: Failed to resolve target definition /root/sources/releng/gov.nasa.jpl.imce.oml.target/gov.nasa.jpl.imce.oml.target.target: Could not find "org.eclipse.e4.rcp.feature.group/1.6.1.v20170829-0553" in the repositories of the current location

This behavior is reproducible with mvn clean verify:

[INFO] Computing target platform for MavenProject: gov.nasa.jpl.imce.oml:gov.nasa.jpl.imce.oml.uuid:0.9.0-SNAPSHOT @ /opt/local/imce/users/nfr/github.imce/gov.nasa.jpl.imce.oml.tycho/plugins/core/gov.nasa.jpl.imce.oml.uuid/.polyglot.build.properties
[INFO] Fetching p2.index from http://download.eclipse.org/sirius/updates/releases/5.0.1/oxygen/
[INFO] Fetching p2.index from http://download.eclipse.org/sirius/updates/releases/5.0.1/oxygen/
[INFO] Adding repository http://download.eclipse.org/sirius/updates/releases/5.0.1/oxygen
[INFO] Fetching p2.index from http://download.eclipse.org/tools/orbit/R-builds/R20170516192513/repository/
[INFO] Fetching p2.index from http://download.eclipse.org/tools/orbit/R-builds/R20170516192513/repository/
[INFO] Adding repository http://download.eclipse.org/tools/orbit/R-builds/R20170516192513/repository
[INFO] Fetching p2.index from http://download.eclipse.org/tools/orbit/downloads/drops2/R20170516192513/repository/
[INFO] Fetching p2.index from http://download.eclipse.org/tools/orbit/downloads/drops2/R20170516192513/repository/
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/
[INFO] Adding repository http://download.eclipse.org/releases/oxygen
[INFO] Fetching compositeContent.jar from http://download.eclipse.org/releases/oxygen/ (497B)
[INFO] Fetching compositeContent.jar from http://download.eclipse.org/releases/oxygen/ (497B)
[INFO] Fetching p2.index from http://download.eclipse.org/technology/epp/packages/oxygen/
[INFO] Fetching p2.index from http://download.eclipse.org/technology/epp/packages/oxygen/
[INFO] Fetching content.xml.xz from http://download.eclipse.org/technology/epp/packages/oxygen/
[INFO] Fetching content.xml.xz from http://download.eclipse.org/technology/epp/packages/oxygen/
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/201712201001/
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/201712201001/
[INFO] Fetching content.xml.xz from http://download.eclipse.org/releases/oxygen/201712201001/ (861.64kB)
[INFO] Fetching content.xml.xz from http://download.eclipse.org/releases/oxygen/201712201001/ (861.64kB)
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/201712201000/
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/201712201000/
[INFO] Fetching content.xml.xz from http://download.eclipse.org/releases/oxygen/201712201000/ (861.12kB)
[INFO] Fetching content.xml.xz from http://download.eclipse.org/releases/oxygen/201712201000/ (861.12kB)
[INFO] Fetching content.xml.xz from http://download.eclipse.org/releases/oxygen/201712201000/ (803.84kB of 861.12kB at 798.47kB/s)
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/201710111001/
[INFO] Fetching p2.index from http://download.eclipse.org/releases/oxygen/201710111001/
[ERROR] Failed to resolve target definition /opt/local/imce/users/nfr/github.imce/gov.nasa.jpl.imce.oml.tycho/releng/gov.nasa.jpl.imce.oml.target/gov.nasa.jpl.imce.oml.target.target: Could not find "org.eclipse.e4.rcp.feature.group/1.6.1.v20170829-0553" in the repositories of the current location -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 

Eclipse Target Definition Challenges

Maintaining a target definition for Eclipse is a fastidious process for several reasons.

• The target editor in Eclipse shuffles the entries, which makes it difficult to see precisely what has changed because there is a lot of superfluous change noise due to the re-ordering of the entries.

• The "Definition" tab of the target editor only shows plugins, not features.

• The "Content" tab of the target editor can switch between managing plugins or managing features. Doing so changes the file and because of the shuffling, it is difficult to tell whether a significant change has been done or not (i.e., just shuffling the order of the entries).

• Finding whether a feature version is the latest or not is difficult.

[NicolasRouquette]

On http://download.eclipse.org/releases/oxygen/, Eclipse features/plugins are published with a version string that is a combination of a qualified version number and a date stamp.

What's really odd is that for several features/plugins, a version built at a given date is no longer available but the same version built at a later date is available.

-<unit id="org.eclipse.e4.rcp.feature.group" version="1.6.1.v20170829-0553"/>
+<unit id="org.eclipse.e4.rcp.feature.group" version="1.6.1.v20170928-1359"/>

-<unit id="org.eclipse.e4.rcp.source.feature.group" version="1.6.1.v20170829-0553"/>
+<unit id="org.eclipse.e4.rcp.source.feature.group" version="1.6.1.v20170928-1359"/>

-<unit id="org.eclipse.equinox.core.feature.feature.group" version="1.4.1.v20170821-1548"/>
+<unit id="org.eclipse.equinox.core.feature.feature.group" version="1.4.1.v20170928-1321"/>

-<unit id="org.eclipse.equinox.core.sdk.feature.group" version="3.13.1.v20170821-1548"/>
+<unit id="org.eclipse.equinox.core.sdk.feature.group" version="3.13.1.v20170928-1321"/>

-<unit id="org.eclipse.equinox.p2.core.feature.feature.group" version="1.4.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.p2.core.feature.feature.group" version="1.4.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.p2.core.feature.source.feature.group" version="1.4.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.p2.core.feature.source.feature.group" version="1.4.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.p2.extras.feature.feature.group" version="1.3.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.p2.extras.feature.feature.group" version="1.3.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.p2.extras.feature.source.feature.group" version="1.3.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.p2.extras.feature.source.feature.group" version="1.3.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.p2.rcp.feature.feature.group" version="1.3.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.p2.rcp.feature.feature.group" version="1.3.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.p2.sdk.feature.group" version="3.10.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.p2.sdk.feature.group" version="3.10.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.p2.user.ui.source.feature.group" version="2.3.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.p2.user.ui.source.feature.group" version="2.3.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.sdk.feature.group" version="3.13.1.v20170906-1529"/>
+<unit id="org.eclipse.equinox.sdk.feature.group" version="3.13.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.server.core.feature.group" version="1.5.1.v20170821-1548"/>
+<unit id="org.eclipse.equinox.server.core.feature.group" version="1.5.1.v20170928-1321"/>

-<unit id="org.eclipse.equinox.server.p2.feature.group" version="1.3.1.v20170906-1259"/>
+<unit id="org.eclipse.equinox.server.p2.feature.group" version="1.3.1.v20170928-1405"/>

-<unit id="org.eclipse.equinox.serverside.sdk.feature.group" version="3.13.1.v20170906-1529"/>
+<unit id="org.eclipse.equinox.serverside.sdk.feature.group" version="3.13.1.v20170928-1405"/>

-<unit id="org.eclipse.jdt.source.feature.group" version="3.13.1.v20170906-1700"/>
+<unit id="org.eclipse.jdt.source.feature.group" version="3.13.1.v20171009-0410"/>

-<unit id="org.eclipse.jst.common.fproj.enablement.jdt.feature.group" version="3.8.0.v201603091933"/>
+<unit id="org.eclipse.jst.common.fproj.enablement.jdt.feature.group" version="3.9.1.v201710021614"/>

-<unit id="org.eclipse.pde.source.feature.group" version="3.13.1.v20170906-1700"/>
+<unit id="org.eclipse.pde.source.feature.group" version="3.13.1.v20171009-0537"/>

-<unit id="org.eclipse.platform.sdk" version="4.7.1.M20170906-1700"/>
+<unit id="org.eclipse.platform.sdk" version="4.7.1.M20171009-0410"/>

-<unit id="org.eclipse.rcp.sdk.id" version="4.7.1.M20170906-1700"/>
+<unit id="org.eclipse.rcp.sdk.id" version="4.7.1.M20171009-0410"/>