I'm using Nx for monorepo support on a new project. One of the benefits of Nx is that it can determine which apps in the monorepo are affected by a range of changes (start commit, end commit). So if you have a bunch of apps, you only have to build, test, and deploy the apps that are actually affected by the changes instead of the entire monorepo.
我想设置一个GitHub Action工作流，以便仅在推送或合并到master时部署受影响的应用。但是，我在弄清楚如何获取更改范围的“开始提交”时遇到了麻烦。换句话说，如何获取上次部署的提交哈希？
GitHub provides an env variable GITHUB_SHA but that's the commit that triggered the workflow (i.e. the "end commit"). It also provides GITHUB_BASE_REF but that only works on workflows running from a forked repo comparing to the head repo.
CircleCI has pipeline.git.base_revision for this purpose. Do GitHub Actions have something similar?
GitHub provides
GITHUB_BASE_REFand thegithub.base_refcontext that contain the base branch.If you're interested in the latest revision of that branch, you can run
git rev-parse $GITHUB_BASE_REFto find it. If you're interested in the point at which the branches forked, you can rungit merge-base $GITHUB_BASE_REF $GITHUB_SHAto find it.请注意，使用不兼容的API更改可能会破坏其他项目，而无需对它们进行任何代码更改，因此，虽然仅测试已更改的应用程序会更快，但您可能会发现这样做会导致意外损坏。