Intermittent kcov failures

[fxbox]

Intermittent kcov failures

[fabricedesre]

That's basically making us perma red. @JohanLorenzo if you don't find what's going on we'll have to disavle kcov.

[JohanLorenzo]

These 2 lines caught my attention:

kcov: error: Can't find or open /home/travis/build/fxbox/foxbox/tools/../target/debug/foxbox-5fe0ccd2f25574e9
+FOXBOX_UNIT_TEST_BINARY='/home/travis/build/fxbox/foxbox/tools/../target/debug/foxbox-5fe0ccd2f25574e9
/home/travis/build/fxbox/foxbox/tools/../target/debug/foxbox-a9cabe0dc62944c7'

It seems 2 test binaries were generated.
Based on the build history, only that one failed for this reason. The following weren't affected.

The one ending with 5fe0ccd2f25574e9 doesn't appear anywhere in the logs. This leads me to think it's a leftover of a previous build, that remained in the cache, but wasn't cleared by cargo when cargo test ran.

I relaunched the job => foxbox-5fe0ccd2f25574e9 is still in target/debug. I cleared the cache and launched the job again => still there. Hence, the cache is not the culprit.

@dhylands Could you add - ls -lR $TRAVIS_BUILD_DIR right after this line? Now that we don't have a cache anymore for your PR, there should be no target directory. If it's showing up, there's something wrong with that VM on Travis.

If not, I'll investigate further to find where this file is generated.

@fabricedesre In the meantime, as it's currently the only PR affected, are you fine with keeping kcov, for now?

[JohanLorenzo]

Discussed with @fabricedesre on IRC. A new failure happened. We can see that it's not running on the same machine as here. I'll need to investigate further.

In the meantime, let's turn off kcov.

[nojunpark]

I'm occasionally seeing this when I trigger foxbox via the mocha test. It says the app isn't there. However it's pretty intermittent.

[dhylands]

I just submitted a build (created a new branch called travis test off the latest master and it shows an empty target directory, which is interesting because we don't have target checked in.
https://travis-ci.org/dhylands/foxbox/builds/114589641