Continuous Integration Before Checking Source Code In

Rusty Elliote Harold argues that continuous integration is back to front and would be more useful if committed code was clean compiled and the unit tests run before it was checked in by the continuous integration process;

Once we've solved the problem of running continuous integration servers on project hosting sites, the next step is to flip them around. The usual process is to commit code to the repository and have the continuous integration server pull the code out of the repository. Then, if the build or tests fail, the continuous integration server goes into red mode and sends out alerts. Wouldn't it be better if the server never turned red in the first place?

What should happen is that new code gets sent directly to the continuous integration server rather than to the source code repository. The continuous integration server pulls the latest known good build from the repository. then it patches the new code into the build and runs the tests. If the tests pass, the continuous integration server commits the code to the repository. If the tests fail, the code is never committed at all.

Which is an excellent idea. We use Bamboo for continuous integration (apparently Atlassian is an Auian company, I didn't know that) and it pulls from the repository. Subversion is pretty needy when patching, far more so than perforce which is very strong in patching/integration, but I am sure it could be done. I merge between subversion branches with shell scripts as part of our project.
Permalink, Continuous Integration Before Checking Source Code In, Dec 2009, cam

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