GLExec Environment Wrap and Unwrap scripts

From PDP/Grid Wiki
Jump to navigationJump to search

GLExec Wrap and Unwrap environment variables] describes how you can wrap environment variables in such a way that they don't get wipe and unwrap them (safely) in the target account (pilot job payload) process.

Where to find packages and sources

We provide a new packages named glexec-wrapper-scripts (at the moment primarily) through the Etics system.

The sources can be found in our SVN repository.

gLExec wrapper scripts: glexec_wrapenv.pl and glexec_unwrapenv.pl)

Helper script to restore the environment variables previously wrapped into the environment variable GLEXEC_ENV using the glexec_wrapenv.pl script.

Intended usage: 

export GLEXEC_ENV=`glexec_wrapenv.pl`
/opt/glite/sbin/glexec glexec_unwrapenv.pl -- <YOUR-COMMAND>

By default the following environment variables are NOT unwrapped:

  • HOME
  • LOGNAME
  • USER
  • X509_USER_PROXY
  • _ (yes that's '_' !)

A user can add more env vars to be excluded using either 

--exclude=A --exclude=B

or 

--exclude=A,B,...

Example 1: 

export GLEXEC_ENV=`glexec_wrapenv.pl --exclude=MYVAR`
/opt/glite/sbin/glexec glexec_unwrapenv.pl -- <YOUR-COMMAND>

Example 2: 

export GLEXEC_ENV=`glexec_wrapenv.pl`
/opt/glite/sbin/glexec glexec_unwrapenv.pl --exclude=MYVAR -- <YOUR-COMMAND>

Example 3: 

export GLEXEC_ENV=`glexec_wrapenv.pl --exclude=MYVAR`
/opt/glite/sbin/glexec glexec_unwrapenv.pl -- <YOUR-COMMAND>
Retrieved from "https://wiki.nikhef.nl/grid/index.php?title=GLExec_Environment_Wrap_and_Unwrap_scripts&oldid=2778"