M4 to check for conntrack support and load modules

gistfile1.txt

# CHECK_CONNTRACK()                                                             
#                                                                               
# Perform requirements checks for running conntrack tests, and flush the        
# kernel conntrack tables when the test is finished.                            
#                                                                               
m4_define([CHECK_CONNTRACK],                                                    
    [AT_SKIP_IF([test $HAVE_CONNTRACK = no])                                    
     AT_SKIP_IF([test $HAVE_PYTHON = no])                                       
     m4_foreach([mod], [[nf_conntrack_ipv4], [nf_conntrack_ipv6]],              
                [modprobe mod || echo "Module mod not loaded."                  
                 echo "loaded mod"                                              
                 lsmod | grep nf_conn                                           
                 on_exit "modprobe -q -r mod"                                   
                 on_exit "echo 'attempting to unload mod'"])                    
     on_exit 'conntrack -F'                                                     
    ]                                                                           
) 

on_exit bash function reads the rest of the line in as arguments, so the '])' to close m4_foreach() needs to be on its own line.