Amending a commit can sometimes lead to duplicate Signed-off-by lines in commit message

[nertzy]

Is there a way we can detect an amend and prevent the duplicate sign off?

[jszwedko]

Good question, I'm not sure off the top of my head, but it is definitely something we could explore.

Thank you for the suggestion!

[dideler]

Just a thought. Could have a pre-commit hook that checks if the commit has the same author and committer. Not sure what the best way is to do that, maybe a git cat-file -p <sha>?

[Jackman3005]

👍

[jszwedko]

Recently discovered via #57 that you can change the default trailer behavior to eliminate the duplicates with: git config [--global] trailer.ifexists addIfDifferent.