[Bug debuginfod/31248] New: debuginfod_find_* may return fd with file-offset at end

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

https://sourceware.org/bugzilla/show_bug.cgi?id=31248

            Bug ID: 31248
           Summary: debuginfod_find_* may return fd with file-offset at
                    end
           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: ---

During the srcfiles test case diagnosis, studying the reason for occasional
0-length files, found something funky about the debuginfod_find_FOO api.

It appears possible for first-time-downloaded files to result in FDs that were
freshly written into by curl, with the file offset positioned right at the end.
 We should lseek(2) to the front.  Clients would expect to be able to read it,
as opposed to an insta-EOF.

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