Usage of fakeroot crashes patool

[maringuu]

Steps to reproduce:

$ tar -cvf install.tar install.py
$ ./fact_extractor/fact_extract.py -d  install.tar

Looking at /tmp/extractor/reports/meta.json it can be observed that patool calls /usr/bin/file --brief --mime-type install.tar
which causes the crash when run with fakeroot.

This is not an issue in the docker container as it already runs with root.