Only open file in read-mode, because it's only going to be read.

[vroomfondle]

Requirements

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Mark the following tasks as done:

• Checked the codebase to ensure that your feature doesn't already exist.
• Checked the pull requests to ensure that another person hasn't already submitted the feature or fix.
• Adjusted the Documentation.
• Added tests to ensure against regression.

Description of the Change

When reading from a file in order to create a temporary copy, open the file in 'read' mode instead of read/write.

Why Should This Be Added?

See #2159 - opening in read/write mode can cause permissions errors.

Benefits

Fewer permissions errors!

Possible Drawbacks

Verification Process

Imported a file which only has read permissions set. It worked.

Applicable Issues

#2159

[patrickbrouwers]

Thanks @vroomfondle !