• src/backup_sync.sh

• Add a check for the existence of the backup_sync_config file at the beginning of the script. This can be done by adding the following lines of code at the beginning of the script:

if [ ! -f backup_sync_config ]; then
    echo "Error: backup_sync_config file not found."
    exit 1
fi

• src/backup_sync.sh

• Add a shebang at the top of the file to specify that the script should be run using bash.
• Define a function that takes a mode as a parameter. This function will handle the backup synchronization process.
• Inside the function, use an if statement to check if the mode is "master". If it is, perform the operations for the master mode.
• Inside the if statement, use git commands to add all changed files, commit with a generic message, and perform a pull and push operation. Use the --work-tree and --git-dir flags for all commands.
• Outside the if statement, use an else if statement to check if the mode is "slave". If it is, perform the operations for the slave mode.
• Inside the else if statement, use a git command to perform a forced pull operation. Use the --work-tree and --git-dir flags for this command.
• Outside the else if statement, use an else statement to handle the case where the mode is neither "master" nor "slave". In this case, print an error message and exit the script.
• At the bottom of the file, call the function with the first command-line argument as the parameter.