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# Since for most Docker users, package installs happen in "docker build" steps, # they essentially become individual layers due to the way Docker handles # layering, especially using CoW filesystems. What this means for us is that # the caches that APT keeps end up just wasting space in those layers, making # our layers unnecessarily large (especially since we'll normally never use # these caches again and will instead just "docker build" again and make a brand # new image). # Ideally, these would just be invoking "apt-get clean", but in our testing, # that ended up being cyclic and we got stuck on APT's lock, so we get this fun # creation that's essentially just "apt-get clean". DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; }; APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; }; Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache ""; # Note that we do realize this isn't the ideal way to do this, and are always # open to better suggestions (https://github.com/debuerreotype/debuerreotype/issues).