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Automatic and manual rebuilding of Java packages
You have updated a Java library and you want to test whether the update breaks existing reverse-dependencies? Here are a few tips.
The manual method
ubuntu-dev-tools (reverse-depends -b) and devscripts (build-rdeps) contain two useful tools to find reverse-build-dependencies. Usually reverse-depends -b will give you better results. Alternatively you can also use apt-cache rdepends <package> to find reverse-dependencies and to check if the listed build-dependencies are consistent with the dependencies of the package.
More useful tools: Schroot, to develop and test your packages in a confined environment. reprepro in combination with cowbuilder, pbuilder or sbuild.
First of all install your new build-dependency that should be tested. Download all source packages with apt source <package> and the required build-dependencies with apt build-dep <package>. Change to the package directory and rebuild the package with debuild -us -uc. Repeat the same steps for all reverse-dependencies.
With cowbuilder: sudo DIST=sid ARCH=amd64 cowbuilder --build <package>.dsc
DebOMatic
DebOMatic is an automatic build machine for Debian source packages. Project Homepage with documentation
ratt
ratt, rebuild all the things!.
Mass rebuild with AWS or similar services
This is a more sophisticated approach for rebuilding a lot or even all Java packages.
Scripts and more documentation can be found at https://github.com/FauxFaux/debjdk9.