[Toolserver-l] cronsub

[River Tarnell]

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Hi,

I've made a couple of changes to cronsub in response to some issues reported by 
users.  Specifically:

* cronsub now requires that the script file be executable, and will raise an 
  error if it's not.  The previous behaviour was that non-executable scripts 
  would be executed by /bin/sh.  If this affects you, the fix is to make the 
  script executable (chmod +x).

* Previously, SGE would copy the job script to a shared directory and execute 
  it there.  For example, if you submitted $HOME/test.py, it would be copied 
  to a file such as /sge62/default/spool/wolfsbane/job_scripts/117333 before 
  starting.  This was unfortunate for Python users who depended on Python's 
  behaviour of treating the script's directory as part of the "import" search 
  path.

  This behaviour has been changed, so that the script file will be executed in 
  its original location.

I appreciate that the first item may be a breaking change for some users.  
However, on balance this seems like the lesser evil.

	- river.
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