tree b4da1fc794a53ad5d5ea1ff103d103180a2129d0
parent 160a88dc9cbb14a182541576cf00da56b8a9f195
author Ned Nguyen <nednguyen@google.com> 1593447329 +0000
committer Commit Bot <commit-bot@chromium.org> 1593452385 +0000

Fix virtualenv version parsing and improve error handling message

1) virtualenv --version(version 20.0.25)  dumps version info on stderr,
so subprocess call output check needs to include stderr as well
2) Update error message to make it clear to users when they need to install virtualenv.

TEST=running the flow locally

Change-Id: Ifc32e49589fb201a0485b069ab0b2b2e2eebbd45
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra_virtualenv/+/2273657
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Tested-by: Ned Nguyen <nednguyen@google.com>