Build debug packages for Arch Linux from a list of files

build_debug_packages.py

"""Build debug packages for Arch Linux from a list of files

Install:
In `/etc/makepkg.conf` disabling stripping binaries and enable the
creation of `-debug` packages.
$ pip install pyalpm

Usage:
Create a file named "debug_symbol_files.txt"

$ python build_debug_packages.py

Rationale:
Arch Linux currently does not include XX-debug packages in its repos.
This makes it difficult to provide complete backtraces in projects
such as KDE. Each package would have to be found (with `pacman -F`)
then downloaded (`asp export <package-name>`) then built (`makepkg`).
This script aims to automate this process by handling the above
transparently.

Future Goals:
* Automatically parse files without debug symbols from `coredumpctl`.
    Probably not going to happen since it's not worth the time
    https://xkcd.com/1205/

"""
import os
import pyalpm

handle = pyalpm.Handle(".", "/var/lib/pacman")
localdb = handle.get_localdb()


def search_for_file(target_file_name):
    for pkg in localdb.pkgcache:
        for (file_name, *_) in pkg.files:
            if f"/{file_name}" == target_file_name:
                return pkg


def build_package(name):
    initial_dir = os.getcwd()
    os.system(f"asp export {name}")
    os.chdir(name)
    os.system("makepkg --noconfirm --nocheck --rmdeps --syncdeps --skippgpcheck --install")
    os.chdir(initial_dir)


def main():
    with open("debug_symbol_files.txt") as f:
        files = set(f.read().splitlines())

    packages_to_rebuild = set()

    for wanted_file in files:
        if not wanted_file: continue

        pkg = search_for_file(wanted_file)
        if pkg:
            packages_to_rebuild.add(pkg.name)
        else:
            print(f"error: no package found for {wanted_file}")

    os.system("asp update")
    for pkg in packages_to_rebuild:
        build_package(pkg)

if __name__ == "__main__":
    main()