1515743 - running mach mochitest in interactive task fails with: ImportError: No module named mozbuild.base

Status: NEW

(Firefox Build System :: Mach Core, enhancement)

Description

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Request a mochitest loaner on Try, ran run-wizard with 2 (setup). Also fails with the mozilla repository checked out and referenced.

root@d597d514cef5:~# mach mochitest browser/components/sessionstore/test/browser_625016.js
Error running mach:
    ['mochitest', 'browser/components/sessionstore/test/browser_625016.js']
The error occurred in mach itself. This is likely a bug in mach itself or a
fundamental problem with a loaded module.
Please consider filing a bug against mach by going to the URL:
    https://bugzilla.mozilla.org/enter_bug.cgi?product=Firefox%20Build%20System&component=Mach%20Core
If filing a bug, please include the full output of mach, including this error
message.
The details of the failure are as follows:
ImportError: No module named mozbuild.base
  File "/builds/worker/workspace/build/tests/tools/mach/mach/main.py", line 359, in run
    return self._run(argv)
  File "/builds/worker/workspace/build/tests/tools/mach/mach/main.py", line 506, in _run
    from mozbuild.base import BuildEnvironmentNotFoundException