backup_restore_volume.sh

#!/bin/bash

# Define usage function
usage() {
    echo "Usage: $0 {backup|restore} -v <volume_name> -f <file_path>"
    echo "Options:"
    echo "  backup: Back up the specified Docker volume to a tarball."
    echo "  restore: Restore a Docker volume from a tarball."
    echo "  -v <volume_name>: Name of the Docker volume."
    echo "  -f <file_path>: Path to the tarball file."
    exit 1
}

# Ensure at least 4 arguments are provided
if [ "$#" -lt 4 ]; then
    usage
fi

# Parse command-line arguments
COMMAND=$1
shift
while getopts ":v:f:" opt; do
    case ${opt} in
        v) VOLUME_NAME=${OPTARG} ;;
        f) FILE_PATH=${OPTARG} ;;
        *) usage ;;
    esac
done

# Ensure volume name and file path are set
if [ -z "$VOLUME_NAME" ] || [ -z "$FILE_PATH" ]; then
    usage
fi

# Check if the Docker volume exists
check_volume_exists() {
    if ! docker volume inspect "$VOLUME_NAME" > /dev/null 2>&1; then
        echo "Error: Docker volume '$VOLUME_NAME' does not exist."
        exit 1
    fi
}

# Backup function
backup_volume() {
    echo "Backing up Docker volume '$VOLUME_NAME' to '$FILE_PATH'..."
    docker run --rm \
        -v "${VOLUME_NAME}:/volume" \
        -v "$(dirname "$FILE_PATH"):/backup" \
        alpine \
        tar -czf "/backup/$(basename "$FILE_PATH")" -C /volume .
    echo "Backup completed."
}

# Restore function
restore_volume() {
    echo "Restoring Docker volume '$VOLUME_NAME' from '$FILE_PATH'..."
    docker run --rm \
        -v "${VOLUME_NAME}:/volume" \
        -v "$(dirname "$FILE_PATH"):/backup" \
        alpine \
        sh -c "rm -rf /volume/* && tar -xzf /backup/$(basename "$FILE_PATH") -C /volume"
    echo "Restore completed."
}

# Execute the specified command
case $COMMAND in
    backup)
        check_volume_exists
        backup_volume
        ;;
    restore)
        check_volume_exists
        restore_volume
        ;;
    *)
        usage
        ;;
esac