fix PYTHONPATH on Linux

[Lxiamail]

for issue dotnet/performance#1928

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Issue Details

---

for issue dotnet/performance#1928

Author:	Lxiamail
Assignees:	-
Labels:	area-Infrastructure-libraries
Milestone:	-

[billwert]

I think these are flipped. This block is the Windows path, so should be set, and the other should be export.

[Lxiamail]

Good catch!

[billwert]

Looked into this a little further. I think this is not the fix that will fix the helix issue.

Earlier in our automation we enable a venv:

+ python3 -m venv /home/helixbot/work/A3AF0971/w/A711092F/u/.venv
+ source /home/helixbot/work/A3AF0971/w/A711092F/u/.venv/Scripts/activate

The line you're changing is built including this variable HelixPreCommandStemLinux, so it should be there:

runtime/eng/pipelines/coreclr/templates/run-performance-job.yml

Line 59 in 21280fd

- HelixPreCommandStemLinux: 'python3 -m pip install -U pip;sudo apt-get -y install python3-venv;python3 -m venv $HELIX_WORKITEM_PAYLOAD/.venv;source $HELIX_WORKITEM_PAYLOAD/.venv/Scripts/activate;export PYTHONPATH=;python3 -m pip install -U pip;pip3 install azure.storage.blob==12.0.0;pip3 install azure.storage.queue==12.0.0;sudo apt-get update;sudo apt -y install curl dirmngr apt-transport-https lsb-release ca-certificates;curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -;sudo apt-get -y install nodejs;sudo apt-get -y install npm;npm install --prefix $HELIX_WORKITEM_PAYLOAD jsvu -g;$HELIX_WORKITEM_PAYLOAD/bin/jsvu --os=linux64 --engines=v8,javascriptcore;export PERFLAB_UPLOAD_TOKEN="$(PerfCommandUploadTokenLinux)"'

By the time the failure noted in dotnet/performance#1928 happens we have exited the venv. This actually seems to me to be an issue with helix or something else having gone wrong on our machines.

(The places added to PYTHONPATH here are solely to support our scenario runs, which is why the fact that it was out of sync here never mattered.)

We need to figure out what is wrong with the machine environment. First Responders may be the right first step.

[Lxiamail]

@billwert based on the test run at https://dev.azure.com/dnceng/internal/_build/results?buildId=1304705&view=results, looks like the fix works. Even though still have some failures on linux, those needs additional investigation and fixes.

[Lxiamail]

Added the same fix for crossgen scenario

[Lxiamail]

Currently due to some helix recent change, helix reporter crashes due to perf test alters PYTHONPATH. Set EnableAzurePipelinesReporter to false since perf test doesn't use helix reporter to upload test results, instead using perf specific scripts.