createUpdate.sh

#!/bin/bash
if [ -z "$1" ]
  then
    echo "Error - missing arg. Usage: createUpdate.sh <updateDirectory> <updateFileName>"
    exit
fi
if [ -z "$2" ]
  then
    echo "Error - missing arg. Usage: createUpdate.sh <updateDirectory> <updateFileName>"
    exit
fi
updateDirectory=$1;
updateDirNoRel=${updateDirectory//"../"};
updateName=$2;
#Lets first tar it
tar -czvf crimsonUpdate.tar.gz $updateDirectory
#MD5SUM 
updateHash=`md5sum crimsonUpdate.tar.gz|awk '{print $1;}'`


echo '#!/bin/bash' > crimsonUpdate.sh

# extract does not require root permissions, otherwise error out for non-sudo
echo 'if [ "$1" != "extract" ]; then' >> crimsonUpdate.sh
echo '    if (( $EUID != 0 )); then' >> crimsonUpdate.sh
echo '        echo ERROR update requires root permissions. Please use sudo.' >> crimsonUpdate.sh
echo '        exit 1' >> crimsonUpdate.sh
echo '    fi' >> crimsonUpdate.sh
echo 'fi' >> crimsonUpdate.sh

echo "if [ -d $updateDirNoRel ]; then" >> crimsonUpdate.sh
echo "    echo 'WARNING: directory $updateDirNoRel already exists. Do you wish to overwrite it with this update?'" >> crimsonUpdate.sh
echo '    select yn in "Yes" "No"; do' >> crimsonUpdate.sh
echo '      case $yn in' >> crimsonUpdate.sh
echo '        Yes ) break;;' >> crimsonUpdate.sh
echo '        No ) exit 1;;' >> crimsonUpdate.sh
echo '      esac' >> crimsonUpdate.sh
echo '    done' >> crimsonUpdate.sh
echo 'fi' >> crimsonUpdate.sh

echo 'echo "Extracting files"' >> crimsonUpdate.sh
echo "SKIP=\`awk '/^__TARFILE_FOLLOWS__/ { print NR + 1; exit 0; }' \$0\`"  >> crimsonUpdate.sh
echo "THIS=\`pwd\`/\$0"  >> crimsonUpdate.sh
#Take the tarfile and pipe it into tar
echo "tail -n +\$SKIP \$THIS | tar -xz"  >> crimsonUpdate.sh

#create flash script
echo 'echo "Validating update"' >> crimsonUpdate.sh
echo "checkHash=\`tail -n +\$SKIP \$THIS | md5sum |awk '{print \$1;}'\`"  >> crimsonUpdate.sh

echo "if [ \"$updateHash\" != \"\$checkHash\" ] " >> crimsonUpdate.sh
echo '  then ' >> crimsonUpdate.sh
echo '      "MD5SUM Mismatch, try recopying file"' >> crimsonUpdate.sh
echo "      rm -rf $updateDirNoRel" >> crimsonUpdate.sh
echo "      exit" >> crimsonUpdate.sh
echo 'fi ' >> crimsonUpdate.sh
echo 'echo "OK"' >> crimsonUpdate.sh

#Update crimson
echo "cd $updateDirNoRel" >> crimsonUpdate.sh

echo 'if [ -z "$1" ]'>> crimsonUpdate.sh
echo '  then'>> crimsonUpdate.sh
echo '      sh update-sd.sh' >> crimsonUpdate.sh
echo '  elif [ "$1" = "extract" ]' >> crimsonUpdate.sh
echo '  then'>> crimsonUpdate.sh
echo "      echo Extracted update to $updateDirNoRel" >> crimsonUpdate.sh
echo '      exit 0' >> crimsonUpdate.sh
echo '  elif [ "$1" = "nolut" ]' >> crimsonUpdate.sh
echo '  then'>> crimsonUpdate.sh
echo '      sh update-sd.sh nolut' >> crimsonUpdate.sh
echo '  elif [ "$1" = "onlylut" ]' >> crimsonUpdate.sh
echo '  then'>> crimsonUpdate.sh
echo '      sh update-sd.sh onlylut' >> crimsonUpdate.sh
echo '  else' >> crimsonUpdate.sh
echo '      sh update-sd.sh' >> crimsonUpdate.sh
echo 'fi' >> crimsonUpdate.sh

echo "cd ../" >> crimsonUpdate.sh
echo "rm -rf $updateDirNoRel" >> crimsonUpdate.sh
echo 'exit 0' >> crimsonUpdate.sh
echo '__TARFILE_FOLLOWS__' >> crimsonUpdate.sh

#append tar to script
cat crimsonUpdate.sh crimsonUpdate.tar.gz > $updateName 

#remove temperary sh and tarbal
rm crimsonUpdate.sh
rm crimsonUpdate.tar.gz

#lets make it executable
chmod +x $updateName