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* '''PATH''' - The system PATH for binaries. The default is '''$PATH:/usr/local/bin'''.
* '''PIP_DOWNLOAD_CACHE''' - Cache PIP downloads. The default is '''/Users/Shared/Jenkins/.pip_download_cache'''.
* '''PIP_INDEX_URL''' - Sets the PyPI index URL. The default is '''<nowiki>http://pypi.build.mtv1.svc.mozilla.com/simple</nowiki>'''empty, to use the main PyPI index.
* '''PIP_USE_MIRRORS''' - Controls use of the PyPI mirrors. By default this is '''false''' to speed up PIP installations.
* '''PIP_VERBOSE''' - Controls the verbosity of PIP output. By default this is '''false''' and useful to enable for debugging.
=== PIP index is unavailable ===
We use an internal mirror of the main PyPI index for installing Python packages. If this experiences issues then we can enable use of PIP mirrors in the [http://qa-selenium.mv.mozilla.com:8080/configure Configure System] page. Alternatively, we can temporarily change the PIP index URLto our internal mirror: '''<nowiki>http://pypi.build.mtv1.svc.mozilla.com/simple</nowiki>'''.
=== PIP installation is slow ===
If Python packages are slow to install you should check that PIP mirrors are not enabled in the [http://qa-selenium.mv.mozilla.com:8080/configure Configure System] page. If mirrors are not enabled, it may be that the internal main PyPI mirror is slow to respond. In this case, try temporarily changing the PIP index URLto the internal mirror: '''<nowiki>http://pypi.build.mtv1.svc.mozilla.com/simple</nowiki>'''.
=== Stalled node jobs ===
