#!/bin/bash
#
# This Bash script is designed to transfer files from a bind-mounted directory on the host machine to a Docker volume 
# using the local driver. It ensures that the operation is performed with root privileges and provides 
# detailed feedback during execution.
#
# Purpose
#
# The script is useful in scenarios where you need to migrate or copy files from a 
# local directory (bind-mounted volume) to a Docker volume. This is particularly helpful when:
#
#    You want to back up files from a bind-mounted volume to a Docker volume.
#    You need to migrate data from a local directory to a Docker volume for containerized applications.
#    You want to ensure that files retain their permissions and ownership during the transfer.
#
#
#
# Ensure the script is run as root
if [ "$EUID" -ne 0 ]; then
    echo "This script must be run as root. Please use sudo or run as root."
    exit 1
fi

# Source directory (bind-mounted volume)
SOURCE_DIR="/media/orbitzs/nextcloud_files/apex/storage/data"

# Target Docker volume (local driver)
TARGET_VOLUME="nc3_files"

# Create the target volume if it doesn't exist
if ! docker volume inspect "$TARGET_VOLUME" &> /dev/null; then
    echo "Creating Docker volume: $TARGET_VOLUME"
    docker volume create --driver local "$TARGET_VOLUME"
fi

# Temporary container to copy files into the target volume
TEMP_CONTAINER="temp_container_$(date +%s)"

# Start a temporary container with the target volume mounted
docker run --rm -d \
    --name "$TEMP_CONTAINER" \
    -v "$TARGET_VOLUME:/target" \
    alpine tail -f /dev/null

# Copy files from the source directory to the target volume
echo "Copying files from $SOURCE_DIR to $TARGET_VOLUME..."
docker cp "$SOURCE_DIR/." "$TEMP_CONTAINER:/target"

# Stop the temporary container
docker stop "$TEMP_CONTAINER"

echo "Files have been successfully transferred to the Docker volume: $TARGET_VOLUME"