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From: "fche at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/27410] New: rpm-set path based probes
Date: Sat, 13 Feb 2021 00:00:29 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27410

            Bug ID: 27410
           Summary: rpm-set path based probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

Bug #25568's introduced capabilities to specify probes by build-id, but thi=
s is
not very user friendly.  What users tend to see directly are file names, and
occasionally filenames from archives that are not even installed.

The attachment is a demonstration prototype for a stap front-end that can t=
ake
a path name and a list of RPM-containing directories.  It computes a
buildid-based script template based on finding all buildids for the given p=
ath
name in any of the RPMs found, and then compiles than via stap -p4.  It use=
s a
temporary instance of debuginfod to build/serve the buildid executables /
debuginfo.

% sh stap-multirpm /usr/bin/vi /path/to/RPMs
[starts debuginfod -R /path/to/RPMs ...]
[chance to edit template SCRIPT.stp]
[compiles to stap_hexcode.ko]
[kills debuginfod]
% sudo staprun stap_hexcode.ko &
% /usr/bin/vi   # of any version from any of those RPMs
[watch stap probe hit]


We should consider growing some native systemtap syntax for this.  Suggesti=
ons
welcome.  Possibility:

probe rpmsearch("/path/to/RPMs/prefix*").process("/path/name").function(...=
) {
}
probe debsearch(...) { }

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