shell script for blog hosting on VPS, powered by Jekyll and GitHub. This script can do the following: 1).keeps sync with github about my blog source and data. 2).uses jekyll to generate the HTML of my blog. 3).sends a email if Jekyll exists with an error.

SyncVPSAndGithub

#!/bin/bash

#function: send a email when error occurs
send_email_and_exit(){
  recipient=$1
  msg=$2

  #send email
  /bin/mail -s "blog generation failure" "${recipient}" << EOF
${msg}
EOF

  #print info
  echo "sending email and exiting due to error"
}

#function: check if git dir is empty or not
git_dir_empty(){
  gitpath=$1
  gitbaseurl=$2
  githubrepo=$3
  
  if [ ! -d ${gitpath} ]; then
    echo "checking out repo for the first time"
    mkdir -p ${gitpath}
    cd ${gitbaseurl}
    git clone ${githubrepo}
  else
    cd ${gitpath}
    git remote rm origin
    git remote add origin ${githubrepo}
    git pull
  fi
}

#begin
echo "running at " `date`
#website basedir
basedir=/www/blog
#http://laobian.me
techdir=${basedir}/tech
gittechdir=${techdir}/archive
ghtechsourcerepo=https://github.com/JerryBian/blog_tech_source.git
ghtechdatarepo=https://github.com/JerryBian/blog_tech_data.git
#http://blog.laobian.me
lifedir=${basedir}/life
gitlifedir=${lifedir}/archive
ghlifesourcerepo=https://github.com/JerryBian/blog_life_source.git
ghlifedatarepo=https://github.com/JerryBian/blog_life_data.git
#set master email
emailto=ProjectBian@gmail.com

#tech source
git_dir_empty "${techdir}" "${basedir}" "${ghtechsourcerepo}"
#tech data
git_dir_empty "${gittechdir}" "${techdir}" "${ghtechdatarepo}"
#life source
git_dir_empty "${lifedir}" "${basedir}" "${ghlifesourcerepo}"
#life data
git_dir_empty "${gitlifedir}" "${lifedir}" "${ghlifedatarepo}"

#jekyll
jekyll ${techdir}/
jekyll ${lifedir}/
#error: generating html
exitCode=$?
if [ ${exitCode} != "0" ]; then 
  send_email_and_exit "${mailto}" "Jekyll failed with exit code ${exitCode}"
fi