Check btest.cfg for Python configparser interpolation errors #121
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This adds a pass over the (non-default) config options in the freshly loaded configparser, catching any interpolation errors and reporting them in our own terms. This has some subtlety since we cannot just check all config options due to configparser's built-in default-fallback behavior. Since btest pulls os.environ into the defaults, checking everything may well trip over some environment variables that aren't formatted for Python interpolation (as, in my case, HISTTIMEFORMAT).
This is a follow-up to #119 because regardless of whether or not we find the default Python error message intuitive, I think crashing out with a backtrace is excessive.
Resolves #119.