I Built a Bayesian GitHub Action to Find the Commit That Broke Your C++ Project

Description and use

A GitHub Action uses Bayesian binary search to quickly locate the commit that broke a C++ build.

Problem

Identifying the specific commit that introduced a build failure in a C++ project can be time‑consuming when the commit history is large.

Outcome

The action reduced the time to locate a breaking commit from hours to minutes, improving debugging efficiency.

Workflow

• 1. Configure the action with the repository and target branch.
• 2. The action clones the repo and runs a binary search over the commit history.
• 3. At each step it builds the project and records success or failure.
• 4. Using Bayesian inference, it narrows the search interval until the first failing commit is identified.
• 5. The action outputs the commit hash and a summary of the failure.

Evidence

I Built a Bayesian GitHub Action to Find the Commit That Broke Your C++ Project

Source

The action automatically runs a Bayesian binary search across commits, returning the first failing commit in a few minutes.

Source