Diff compares all files even tough --filename= is specified

[oscarthorn]

Expected behavior

If --filename= is specified I expect comparison of only that file.

Actual behavior

It compares all file and first give me the same output as just specifying --type=file, then it compares the actual file, this wastes a lot of time.

Information

• container-diff version: v0.17.0 built from git bea7ad9
• Operating system: Ubuntu 20.04

Steps to reproduce the behavior

Run: container diff --type=file --filename=/some_file