Elfrewriter is a small set of tools built on top of pyelftools to retrieve and change informations about elf binaries. It is mostly concerned with ELF features relevant to make relocatable binaries (DT_RUNPATH feature).
from elfrewriter import ELFRewriter rewriter = ELFRewriter("a.out") print rewriter.dependencies print rewriter.rpaths # One can change rpaths, but changes will only be written after commit # has been called (see also known limitations). rewriter = ELFRewriter("a.out") rewriter.rpaths = ["yo", "mama"] rewriter.commit() # Use a context manager to ensure changes are committed with ELFRewriter("a.out") as rewriter: rewriter.rpaths = ["yo", "mama"]
- ability to query/change rpath
- ability to query/change the dependencies
- modification is done through patchelf binary in a subprocess: http://nixos.org/patchelf.html. In theory, one could implement the feature using pyelftools, but that would be quite a bit of work in the case where the rpath entry needs to grow. Patches welcome though !
- consequence of the above: while querying works on any platform supported by pyelftools, modifying a binary only works on a machine with patchelf (most likely only Linux).
Development happens on github