docker-diff
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Diff using file content instead of file size?
It looks like the diff this produces is based on the file names and sizes as listed by export/tar. What happens if a file changes but stays the same length?
One option could be to compare hashes of the files in addition to the names. Even just including the modified time in the diff would help.
this might help: https://github.com/moul/docker-diff/pull/12