[Bug gdb/29581] New: [gdb/debuginfod] Improve cancelling multiple downloads

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29581

            Bug ID: 29581
           Summary: [gdb/debuginfod] Improve cancelling multiple downloads
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

When loading an exec into gdb, and libdebuginfod is enabled and available, a
single download of debug info is done.

But after starting the exec, shares libs will be loaded, and downloads will be
issued for each of them, which can be many.

If you want to cancel a single download, you press ^C, and gdb will continue
with downloading the debuginfo for the next shared lib.

But if you want to cancel all following downloads, there's no option but to ^C
repeatedly, all he way to the eventual gdb prompt.

IWBN if this process was streamlined somewhat.

A simple idea to improve on this would be to upon ^C present the user with a
choice prompt:
...
Download cancelled, continue downloading more debug info (y/n)?
...

If n is replied, the downloading of further debug info for other shared libs
would be cancelled.

The question is what scope that choice would have.  We could simply interpret
it to mean "set debuginfod enabled off".

Alternatively, we could define a download session, and have it be valid for the
length of the download session, which could last till for instance the next gdb
prompt.

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