ssh_wrapper

#!/bin/bash

## General notes:
## This wrapper script was developed for running StarCCM++ inside of a Singularity container.
## It's purpose is to be passed to starccm+ via the -rsh option and allows starccm+ built in MPI
## to be used for parallel jobs by making sure SSH communications to compute nodes first start 
## the Singularity container located at $SINGULARITY_IMAGE.
##
## reference all arguments with  $@
## refernce number of arguments with $#

# number of arguments before we need to insert singularity commands 
# This ended up NOT being used but is left in case this makes sense for other wrapper scripts
#NUM_ARG_SSH=2

# which singularity image are we loading
# NOTE: this needs to be used in a sed command so all "/" and "." characters need to be escaped with "\"
SINGULARITY_IMAGE=\/data\/singularity\/starccm\.img

# pipe all arguments to this command into sed to insert the singularity exec command where necessary.
# NOTE: this sed command was developed after echo-ing all arguments sent to the ssh-wrapper script
##      which showed that there were only two arguments sent to ssh, and ip address and the -n option.
##      This sed catches " -n " and replaces it with " -n singularity exec $SINGULARITY_IMAGE ".
NEW_ARGUMENTS=$(echo $@ | sed 's/ -n / -n singularity exec $SINGULARITY_IMAGE /g' )

# pass newly formatted arguments to ssh.
ssh $NEW_ARGUMENTS

exit