Show information while downloading debug symbols

まず、pystack のデバッグシンボルのダウンロード経路を追跡し、QtWebEngine や Chromium を使用するプロセスなど、大きなシンボルを必要とするプロセスに対して実行します。完了の条件は、ユーザーが待機の前または最中に、可能であれば進捗付きの明確なダウンロード状況メッセージを確認でき、何が時間やデータを消費しているのかを把握できることです。

Is there an existing proposal for this?

• I have searched the existing proposals

Is your feature request related to a problem?

I tried pystack the first time, in a somewhat mediocre WiFi (capped to 20 MBit/s; I assume there are parts of the world where way less than that is common for many people). I used it on a project which has a lot of C++ debug symbols (via QtWebEngine/Chromium).

Given the claims about performance in the readme, I was quite surprised when pystack only printed basic information (up to "The process died due receiving signal SIGSEGV"), and then hung for 3.5 minutes before printing a stack.

Only while investigating the issue, I figured out the culprit was downloading of a couple 100MB of debug information (if it's any indication, my ~/.cache/debuginfod_client/ is currently 1.7 GB), and printing of the stack was indeed lightning fast! 🚀

As an additional consideration, I'm often on metered networks (tethering via a mobile connection while abroad). With that, such a message would have made me realize what was going on so I could cancel the download before it burns all through my data.

Describe the solution you'd like

At minimum, a "Downloading debug information..." would have helped here already. Ideally, some live updating progress like "Downloading debug information for libXYZ.so (1MB/100MB)" or somesuch would be even better.

Alternatives you considered

Running pystack on pystack to realize why it was hanging 😉