The infrastructure to manipulate Debian packages assumes that if two packages have the same name and version, they're the same package. You should add a changelog entry and change the version number if you modify anything in the package.
So you can use ar to extract the control archive, modify its files, and use ar again to replace the control archive by a new version. Fortunately, deb packges are in a standard format: they're ar archives. dpkg-deb doesn't provide a way to do that. Rather than mess with permissions, you can keep the data archive intact and modify only the control archive. Note that you need to run the whole sequence under fakeroot, not each dpkg-deb individually, since it's the fakeroot process that keeps the memory of the permissions of the files that can't be created as they are. One way to avoid this is to run your script under fakeroot. mkdir tmpīeware that unless your script is running as root, the files' permissions and ownership will be corrupted at the extraction stage. To unpack the package, create an empty directory and switch to it, then run dpkg-deb to extract its control information and the package files. The primary command to manipulate deb packages is dpkg-deb.
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