Current version skips every file on Travis

[JoseKilo]

This PR #810 added a new check to skip some files/directories considered unsafe by default.

The regex excludes anything with build in the path, which usually would be ok.

However, Travis does its job by cloning to /home/travis/build/.

This effectively causes every file to be skipped by isort when running on Travis by default.

Using --unsafe or safety_excludes=False in the config solves the issue.

[jdufresne]

I think the solution would be to avoid skipping paths if the path is passed explicitly on the command line. When no path is passed, assume the PWD is explicit. This way /home/travis/build wouldn't be checked.

CC @akx

[kwohlfahrt]

This also affects the Nix build sandbox, which uses /build as its temporary directory. This causes all of isort's test that rely on files (e.g. test_other_file_encodings) to fail. This can be worked-around by setting TMPDIR, but is surprising.

[timothycrosley]

Should be fixed in this pull request: #878

[timothycrosley]

This should be fixed in hotfix release 4.3.11: https://github.com/timothycrosley/isort/releases/tag/4.3.11

Thanks for reporting!

~Timothy