RPM Macro Expansion in Python

Parse RPM macro files and spec files, and expand macros safely—without the potential Turing Complete side effects.

This is a standalone library that depends only on the standard Python library and PLY (for expression parsing).

How to Use It

$ norpm-expand-specfile --specfile SPEC --expand-string '%version %{!?epoch:(none)}'
1.1.1 (none)

Directly from Python, you can use:

from norpm.macrofile import system_macro_registry
from norpm.specfile import specfile_expand
registry = system_macro_registry()
registry["dist"] = ""
with open("my.spec", "r", encoding="utf8") as fd:
    expanded_specfile = specfile_expand(fd.read(), registry)
    print("Name: ", registry["name"].value)
    print("Version: ", registry["version"].value)

TODOs

There are many features yet to be implemented. Contributions are highly encouraged!

• %undefine
• Parametric macro definitions + calls
• %if, %else parsing (generic)
• expression parsing (e.g., for %if)
• version comparisons, like v"1" < v"1.2"
• functions in expressions
• %bcond* support
• %if[n]arch
• rpmrc files (these e.g. define %optflags)
• %include
• %dnl
• %[expressions]
• %SOURCEN
• Requires/BuildRequires parsing
• built-ins, %{expand:}, etc.
• %{lua:} (not safe, must be an opt-in)
• %(shell) (not safe, must be an opt-in)