Poll the remote git repository using git fetch & then git status && pull from git hub based on the status of the branch.

pollpull.sh

#!/bin/bash
 
#Current (Remote) Branch
currentbranch=""
 
#Fetch from the remote branch
echo "polling..."
if [ -n "$currentbranch" ]; then
  git fetch $currentbranch
else 
  git fetch
fi
 
#Poll the status of the repo
status=$(git status -uno)
 
#Regex to search the status message e.g. branch is behind
regex="Your branch is behind"
 
#Run the regex match
if [[ $status =~ $regex ]] ; then
  echo "Your branch is behind.\nupdating..."
   
  #Pull from git repo
  if [ -n "$currentbranch" ]; then
    git pull $currentbranch
  else
    git pull
  fi 
 
  #optional for use with submodules
  git submodule update --init
 
  #Insert code here to perform other functions following pull.
else 
  #Branch is up to date
  echo "Your branch is up to date."
fi