[PATCH v2 0/3] initscript: add support for uprobes scripts

[Stefan Hajnoczi]

v2:
 * Add Patch 1 with stap --save-uprobes option [Josh]
 * Switch from stap -k to stap --save-uprobes [Josh]

The initscript currently fails for user-space probing scripts on systems where
uprobes.ko is built from source by stap(1).  This is because the initscript
uses a two-phase "compile and then run" approach:

The uprobes.ko module is generated during the compile phase but not copied into
the cache directory where modules are placed for the run phase.  The staprun(8)
command fails because the script module cannot be loaded without uprobes.ko.

These patches address the issue by copying uprobes.ko into the cache directory.
If a script specifies the -u option in its initscript configuration file,
staprun(8) will receive the path to uprobes.ko.

There is no change in behavior on systems that do not build uprobes.ko.  This
has been tested on RHEL6 (builds uprobes.ko) and RHEL7 (systemtap and does not
build uprobes.ko).

Stefan Hajnoczi (3):
  stap: add --save-uprobes
  initscript: copy uprobes.ko to cache directory
  initscript: allow scripts to load uprobes

 buildrun.cxx            |  4 +++-
 cmdline.cxx             |  1 +
 cmdline.h               |  1 +
 initscript/systemtap.in | 15 +++++++++++++++
 main.cxx                |  8 ++++++++
 session.cxx             | 10 ++++++++++
 session.h               |  2 ++
 7 files changed, 40 insertions(+), 1 deletion(-)

-- 
1.9.3