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For kernel developers, it may be common practice to reuse the same
kernel build tree for several kernel variants. Our previous hashing
only considered the release version, architecture, and build path, which
may all remain constant for such a developer.
This change adds the file size and mtime of several kernel version files
to the hash, so it should be a bit more robust against collisions.
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To use tracepoints, we build a "tracequery" module that compiles
debuginfo for all available tracepoints in the user's kernel. That's a
bit of a cumbersome step to do during pass-2 though. This change adds
tracequery caching so we only need to compile it once.
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Merge from setuid-branch. Changes also by Martin Hunt
<hunt@redhat.com>.
* Makefile.am: Added staprun_funcs.c and cap.c to
staprun_SOURCES. Added -lcap to staprun_LDADD. Removed
stp_check reference. Added stapio program. Staprun is now
setuid.
* Makefile.in: Rebuilt.
* configure.ac: Version increase to 0.6 and checks for libcap
availability. Removed stp_check reference.
* configure: Regenerated.
* stp_check.in: Removed.
* systemtap.spec.in: Version increase to 0.6-1 and added
BuildReq for libcap-devl (and removed sudo requirement).
Added %pre script to create new groups. Staprun is now
setuid.
* NEWS: Added info on new security model.
* INTERNALS: Removed sudo reference.
* README.security: New file.
* main.cxx (main): Make sure module name isn't too long.
* hash.cxx: Moved MODULE_NAME_LEN define to hash.h.
* hash.h: Moved MODULE_NAME_LEN define here from hash.cxx.
* buildrun.cxx (run_pass): No longer runs staprun with "sudo".
* stap.1.in: Removed sudo references and added information about
the stapdev/stapusr groups.
* staprun.8.in: Added information about module detaching and
attaching. Removed sudo references and added information
about the stapdev/stapusr groups. Removed reference to
staprun needing to be run as root. Removed reference to
removed '-u USERNAME' option.
* .cvsignore: Removed stp_check and added stapio and stap_merge.
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* main.cxx (printscript): New function containing code moved from
main().
(main): Added code to create cache directory, call function to
generate hash, and see if we can use cached source/module. If
pass 4 is actually run to produce a new module, we call
add_to_cache() to cache the result.
* session.h (struct systemtap_session): Added hash/cache session
data.
* cache.cxx: New file handling adding/getting files from the
cache.
* cache.h: New header file for cache.cxx.
* hash.cxx: New file containing C++ wrapper for routines in
mdfour.c and the find_hash function which computes the hash file
name for an input script.
* hash.h: New header file for hash.cxx.
* mdfour.c: New file containing MD4 hash code.
* mdfour.h: New header file for mdfour.c.
* util.cxx: New file containing several utility functions used by
the caching code.
* util.h: New header file for util.cxx.
* Makefile.am: Added new C/C++ files.
* Makefile.in: Regenerated.
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