[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.7-96-g4bf09a2

[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.7-96-g4bf09a2

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- Log -----------------------------------------------------------------
commit 4bf09a21457027eb511bb16a9355d6e17a93ae5f
Merge: ebbfed0 77c59b0
Author: Josh Stone <jistone@redhat.com>
Date:   Thu Mar 8 16:53:38 2012 -0800

    Merge branch 'sysroot'
    
    Conflicts:
    	cmdline.cxx
    	cmdline.h
    	session.cxx
    (Reconciled with commit 372c6458, "Long options rework.")

commit 77c59b0d311c786c6a0cff2b35f6436fbe349ba0
Author: Wade Farnsworth <wade_farnsworth@mentor.com>
Date:   Thu Mar 8 07:51:00 2012 -0700

    PR12331: Add testcase for --sysroot and --sysenv
    
    Signed-off-by: Wade Farnsworth <wade_farnsworth@mentor.com>

commit dc53a28abd94706dc30cc063d2700eb3deb3c5f0
Author: Wade Farnsworth <wade_farnsworth@mentor.com>
Date:   Thu Mar 8 07:49:58 2012 -0700

    PR12331: Document --sysroot and --sysenv
    
    Update stap.1 and NEWS to document the new options.

commit 05fb3e0c90d5175acfca9cee7a6983b0c9b62f91
Author: Wade Farnsworth <wade_farnsworth@mentor.com>
Date:   Thu Mar 8 07:49:04 2012 -0700

    PR12331: Introduce stap options --sysroot and --sysenv
    
    This adds new command-line options to facilitate different file locations at
    compile-time versus run-time when generating stap kernel modules for a remote
    system:
    
    1. --sysroot=DIR
       Specifies a separate filesystem for the remote system on the local
       system.  The following stap functionalities will make use of this:
    
       a. When compiling process and library probes with a remote filesystem path
          (e.g. process("/bin/foo") with --sysroot=/bar/baz).  In this case symbols
          will be taken from the local filesystem (/bar/baz/bin/foo), but the
          resulting .ko will still contain paths on the remote filesystem
          (/bin/foo).
    
       b. When passing a kernel release with -r (not a full path), the kernel
          build directory will be expected in the sysroot.
    
       c. When DWARF debug info is contained in a separate file from the
          executable, the sysroot is used to find the debug info files.
    
       d. All calls to find_executable() search the path passed in the
          argument env_path relative to the sysroot.  For example if
          PATH=/bin/foo, and --sysroot=/bar/baz is provided, then
          find_executable() called with env_path == "PATH" will search
          /bar/baz/bin/foo.
    
       e. stap attempts to detect if a path in a probe would be outside of the
          sysroot and errors appropriately.  This situation may occur, for
          example, if the path contains several ".." directories.
    
    2. --sysenv=VAR=VALUE
       Specifies a different environment variable for the remote system as opposed
       to the local one, and that the value on the remote system should be used.
       Currently only valid env_path arguments to find_executable() are handled
       (i.e. PATH, LD_LIBRARY_PATH).  If --sysroot is provided and --sysenv
       is omitted, then the local environment relative to the sysroot will
       be used.
    
    These options are disabled for systemtap clients.
    
    Signed-off-by: Wade Farnsworth <wade_farnsworth@mentor.com>

-----------------------------------------------------------------------

Summary of changes:
 cmdline.cxx                                 |    2 +
 cmdline.h                                   |    4 +-
 dwflpp.cxx                                  |    4 +-
 hash.cxx                                    |    3 +-
 main.cxx                                    |    9 ++++
 session.cxx                                 |   59 ++++++++++++++++++++++++
 session.h                                   |    3 +
 setupdwfl.cxx                               |   37 +++++++++++++--
 setupdwfl.h                                 |    1 +
 stap.1                                      |   13 +++++
 tapset-itrace.cxx                           |    7 ++-
 tapset-utrace.cxx                           |    7 ++-
 tapsets.cxx                                 |   66 ++++++++++++++++++---------
 tapsets.h                                   |    2 +
 testsuite/systemtap.base/sysroot_sysenv.exp |   15 ++++++
 testsuite/systemtap.base/sysroot_sysenv.stp |    3 +
 translate.cxx                               |    4 +-
 util.cxx                                    |   27 +++++++++---
 util.h                                      |    3 +
 19 files changed, 225 insertions(+), 44 deletions(-)
 create mode 100644 testsuite/systemtap.base/sysroot_sysenv.exp
 create mode 100644 testsuite/systemtap.base/sysroot_sysenv.stp


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