simple-backup.sh

#!/bin/bash

script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

cd "$script_dir" || exit

set -o errexit
set -o nounset
set -o pipefail



##### READ CONFIGURATION #####

config_file="simple-backup.conf"

# Get nfs mount path
section="nfs"
key="path"

nfs_mount_path=$(awk -F= -v section="$section" -v key="$key" '
  $0 ~ "\\[" section "\\]" { in_section=1; next }
  $0 ~ /^\[.*\]/ { in_section=0 }
  in_section && $1 ~ key { gsub(/^[ \t]+|[ \t]+$/, "", $2); print $2; exit }
' $config_file)

if test -z "$nfs_mount_path"; then
  echo "No nfs volume path was provided"
  exit 1
fi

# Get nfs server
section="nfs"
key="server"

nfs_server=$(awk -F= -v section="$section" -v key="$key" '
  $0 ~ "\\[" section "\\]" { in_section=1; next }
  $0 ~ /^\[.*\]/ { in_section=0 }
  in_section && $1 ~ key { gsub(/^[ \t]+|[ \t]+$/, "", $2); print $2; exit }
' $config_file)

if test -z "$nfs_server"; then
  echo "No nfs volume path was provided"
  exit 1
fi

# Get nfs volume path
section="nfs"
key="volume"

nfs_volume_path=$(awk -F= -v section="$section" -v key="$key" '
  $0 ~ "\\[" section "\\]" { in_section=1; next }
  $0 ~ /^\[.*\]/ { in_section=0 }
  in_section && $1 ~ key { gsub(/^[ \t]+|[ \t]+$/, "", $2); print $2; exit }
' $config_file)

if test -z "$nfs_volume_path"; then
  echo "No nfs volume path was provided"
  exit 1
fi

# Get source directories
section="files"
key="source"

source_directories=($(awk -F= -v section="$section" -v key="$key" '
  $0 ~ "\\[" section "\\]" { in_section=1; next }
  $0 ~ /^\[.*\]/ { in_section=0 }
  in_section && $1 ~ key {
    gsub(/^[ \t]+|[ \t]+$/, "", $2); 
    print $2
  }
' $config_file))

if test -z "$source_directories"; then
  echo "No source directory was provided"
  exit 1
fi

# Get excluded directories
section="files"
key="exclude"

# Read the INI file and extract all values into an array
excludes=($(awk -F= -v section="$section" -v key="$key" '
  $0 ~ "\\[" section "\\]" { in_section=1; next }
  $0 ~ /^\[.*\]/ { in_section=0 }
  in_section && $1 ~ key {
    gsub(/^[ \t]+|[ \t]+$/, "", $2); 
    print $2
  }
' $config_file))



##### MOUNTS NFS SHARE #####

if [ ! -d "$nfs_mount_path" ]; then
  mkdir -p "$nfs_mount_path"
  echo "Directory '$nfs_mount_path' created."
fi

mountpoint -q $nfs_mount_path || mount $nfs_server:$nfs_volume_path $nfs_mount_path



##### Backup #####

source_string=""
for source in "${source_directories[@]}"; do
  source_string+="${source} "
done

exclude_string=""
for exclude in "${excludes[@]}"; do
  exclude_string+="--exclude=${exclude} "
done

readonly BACKUP_DIR="${nfs_mount_path}/backups/${HOSTNAME}"
readonly DATETIME="$(date '+%Y-%m-%d_%H:%M:%S')"
readonly BACKUP_PATH="${BACKUP_DIR}/${DATETIME}"
readonly LATEST_LINK="${BACKUP_DIR}/latest"

mkdir -p "${BACKUP_DIR}"

rsync_cmd_str="rsync -avR --delete ${source_string} --link-dest ${LATEST_LINK} ${exclude_string} ${BACKUP_PATH}"
echo $rsync_cmd_str
$rsync_cmd_str

rm -rf "${LATEST_LINK}"
ln -s "${BACKUP_PATH}" "${LATEST_LINK}"