captthulkman.sh

#!/usr/bin/env bash

# ---------------------------
# --         Traps         --
# ---------------------------
# Always execute "cleanup" function on exit
trap cleanup EXIT

# -------------------------------
# --         Functions         --
# -------------------------------
# Cleanup Environment
cleanup() {
    # Clear memory
    unset source destination ownerUser ownerGroup
}

# Check Variables/Options
checkOpts() {
    # Check Variables
    [ -n "${source}" ] || { printErr "null" "source"; return 1; }
    [ -n "${destination}" ] || { printErr "null" "destination"; return 1; }
    [ -n "${ownerUser}" ] || { printErr "null" "ownerUser"; return 1; }
    [ -n "${ownerGroup}" ] || { printErr "null" "ownerGroup}"; return 1; }
    
    # Check Directories
    [ -d "${source}" ] || { printErr "dir" "${source}"; return 1; }
    mkdir --parents "${destination}" 2>/dev/null || { printErr "dir" "${destination}"; return 1; }
    
    # Check Users
    getent passwd "${ownerUser}" || { printErr "user" "${ownerUser}"; return 1; }
    
    # Get Groups
    getent group "${ownerGroup}" || { printErr "group" "${ownerGroup}"; return 1; }
    
    # Return Success
    return 0
}

# Print Errors :: String type, String message part
printErr() {
    # Return if args not passed
    [ -n "${2}" ] || return
    
    # Determine message to print
    local msg
    case "${1,,}" in
        null )     msg="Variable not defined";;
        dir )     msg="Cannot locate or create directory";;
        user )     msg="User does not exist";;
        group ) msg="Group does not exist";;
        * )     msg="An unexpected error occurred";;
    esac
    
    # Print Message
    printf 'ERROR: %s: %s\n' "${msg}" "${2}"
}

# -------------------------------
# --         Variables         --
# -------------------------------
source="/opt/test/old"
destination="/opt/test/new"
ownerUser="root"
ownerGroup="root"

# ---------------------------
# --        Run            --
# ---------------------------
# Check for errors -- if any detected, abort script
checkOpts || exit 1

# Use rsync to mirror data from source to destination
rsync -auvHAX --safe-links --no-owner --no-group --remove-source-files "${source}/" "${destination}"

# Set Permissions on destination path
chmod --recursive 775 "${destination}"
chown --recursive "${ownerUser}:${ownerGroup}" "${destination}"

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