Don't await a StackOverflowError on a redirection loop

[thahnen]

In case of a redirection loop for URI of a p2 repository, fail fast on a redirection loop. In this case provide a warning to the user and let the rest be handled by Tycho. Otherwise there might be a StackOverflowError due to the recursion used and no check for whether the base URI is the same as the redirected URI.

This links to #4451 but does not fix it, only raising visibility for such cases.

[github-actions]

Test Results

  603 files    603 suites   4h 22m 4s ⏱️
  431 tests   424 ✅  7 💤 0 ❌
1 293 runs  1 271 ✅ 22 💤 0 ❌

Results for commit 9fa7feb.

♻️ This comment has been updated with latest results.

[laeubi]

Any chance you can enhance the existing integration test to show the behavior?

[thahnen]

@laeubi which one is the corresponding one?

I was thinking about creating a new one with a web server redirecting to itself to mimic this. But I haven't finished yet reading the documentation of Jetty ^^

[laeubi]

If you search for HttpServer references in the test you should find some test that already do something in that direction.

[thahnen]

Hi @laeubi, sorry for the late response. I will take some time later today to create an IT or to update a fitting existing one.

[thahnen]

Sadly, for whatever reason I wasn't able to run the ITs from within Eclipse itself due to the launch configuration tycho-its - prepare test resources failing with an exception from both the launcher as well as when running the test from the command line mvn clean verify -f tycho-its/pom.xml -Dtest=P2RedirectLoopTest:
prepare_test_resources.log

I have to await the CI and then wait and see.

[laeubi]

In eclipse you can simpel right click and choose to run as unit test. But due to the nature of tycho/maven it is usually better to use maven CLI with remote debugging.

For this simply do

• mvn clean install -T1C -DskipTests
• cd tycho-its
• mvn clean install -Pits -Dtest=<full class name of test>

[thahnen]

Hey @laeubi,

I have been trying for a few days now to create an IT for this behavior but with no success. Taking a look at all P2-related ITs, I could not really find a way to hook into one, so I created one on my own.

But even having a Jetty where the p2.index was reachable and linked to a compositeContent.xml and compositeArtifacts.xml on another server that would create the redirection loop did not work.
My initial idea of just having a target platform linking to a server that would redirect to itself for every file would not work because it failed earlier by not finding a p2 metadata repository 😞