[Bug debuginfod/27982] New: debuginfod client maximum-transfer-size and -time parameters

["fche at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27982

            Bug ID: 27982
           Summary: debuginfod client maximum-transfer-size and -time
                    parameters
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: debuginfod
          Assignee: unassigned at sourceware dot org
          Reporter: fche at redhat dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

DEBUGINFOD_TIMEOUT is a good way to catch servers that are too slow to *start*
transmitting a file.  But we have no way of limiting total download time or
space.  A user might prefer to have his debugger fetch only quick & small
files, and make do without the bigger ones.  Some transitive dependencies of
e.g. gnome programs are huge: 3GB of LLVM debuginfo, 1GB of webkitgtk, etc.
etc.

We could add a $DEBUGINFOD_MAXSIZE and/or $DEBUGINFOD_MAXTIME parameters to the
client side environment variable suite.  The MAXSIZE one could be communicated
to the server in the query as an extra header, so it can quickly respond with
some HTTP error code (since it can generally find out the destination file
sizes prior to actually decompressing them); it can also be enforced during
download, as soon as a Content-Length: header is received.  The MAXTIME one
could be added as a debuginfod-client.c main loop parameter.

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