Validate if commit exists

Question

How to validate whether the commit with given sha exists in current branch?

There are many ways to parse outputs, but I need optimal way which returns boolean (for u

Answer 1

git rev-parse --quiet --verify 

Does not actually verify that commit (I guess SHA1 is what is meant) exists. It verifies that there is an object in the database corresponding to the SHA1 provided. That is, if there is a blob or tree object that matches the SHA1, it will report that it exists, even if it is not a commit.

git rev-parse --quiet --verify ^{commit}

This will verify that the object exists and that it is an object that can be used as a commit (commit or annotated tag).