Package io.jenkins.plugins.forensics.git.reference

Provides classes to discover reference builds in Git projects.

Several plugins that report build statistics (test results, code coverage, metrics, static analysis warnings) typically show their reports in two different ways: either as absolute report (e.g., total number of tests or warnings, overall code coverage) or as relative delta report (e.g., additional tests, increased or decreased coverage, new or fixed warnings). In order to compute a relative delta report a plugin needs to carefully select the other build to compare the current results to (a so called reference build). For simple Jenkins jobs that build the main branch of an SCM the reference build will be selected from one of the previous builds of the same job. For more complex branch source projects (i.e., projects that build several branches and pull requests in a connected job hierarchy) it makes more sense to select a reference build from a job that builds the actual target branch (i.e., the branch the current changes will be merged into). Here one typically is interested what changed in a branch or pull request with respect to the main branch (or any other target branch): e.g., how will the code coverage change if the team merges the changes. Selecting the correct reference build is not that easy, since the main branch of a project will evolve more frequently than a specific feature or bugfix branch.