Add backup2mdisc.sh
Signed-off-by: first <first@noreply.git.r21.io>
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backup2mdisc.sh
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243
backup2mdisc.sh
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#!/usr/bin/env bash
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#
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# backup_to_mdisc.sh
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#
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# A script to:
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# 1. Archive a directory.
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# 2. Compress and encrypt it.
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# 3. Split into chunks (default 100GB).
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# 4. Generate checksums and a manifest.
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# 5. Optionally create ISO images for burning to M-Disc.
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#
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# Usage:
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# ./backup_to_mdisc.sh /path/to/source /path/to/destination [CHUNK_SIZE] [--create-iso] [--burn]
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#
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# Examples:
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# ./backup_to_mdisc.sh /home/user/documents /media/backup 100G --create-iso
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# ./backup_to_mdisc.sh /data /backup 100G --create-iso --burn
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#
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# Dependencies (install these if missing):
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# - tar
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# - xz
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# - gpg
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# - split
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# - sha256sum (on BSD/macOS, use 'shasum -a 256')
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# - genisoimage or mkisofs (for ISO creation)
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# - growisofs (on Linux, for burning)
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# - hdiutil (on macOS, for burning)
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#
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# NOTE:
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# - This script assumes you have a functioning optical burner that supports
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# 100GB M-Disc (BD-XL) media, and the relevant drivers and software installed.
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# - For FreeBSD, adjust commands (e.g., use 'shasum -a 256' instead of 'sha256sum').
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set -e
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#####################################
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# CONFIGURATION #
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#####################################
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# The default chunk size for splitting. 100GB is typical for 100GB M-Disc (BD-XL).
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DEFAULT_CHUNK_SIZE="100G"
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# The name for the final TAR.XZ.GPG file (before splitting).
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# This will be suffixed by .partNN once split.
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ENCRYPTED_ARCHIVE_NAME="backup.tar.xz.gpg"
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# The manifest file name.
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MANIFEST_NAME="backup_manifest.txt"
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#####################################
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# HELPER FUNCTIONS #
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#####################################
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# Cross-platform SHA-256 function. On Linux, we can rely on 'sha256sum'.
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# On macOS/FreeBSD, you might need to use 'shasum -a 256'.
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function compute_sha256() {
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if command -v sha256sum >/dev/null 2>&1; then
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sha256sum "$1"
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else
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shasum -a 256 "$1"
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fi
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}
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#####################################
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# MAIN SCRIPT #
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#####################################
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function usage() {
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echo "Usage: $0 /path/to/source /path/to/destination [CHUNK_SIZE] [--create-iso] [--burn]"
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echo
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echo "Example: $0 /home/user/docs /mnt/backup 100G --create-iso --burn"
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exit 1
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}
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# Parse arguments
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SOURCE_DIR="$1"
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DEST_DIR="$2"
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CHUNK_SIZE="${3:-$DEFAULT_CHUNK_SIZE}"
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shift 3 || true
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CREATE_ISO=false
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BURN_MEDIA=false
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for arg in "$@"; do
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case "$arg" in
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--create-iso)
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CREATE_ISO=true
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;;
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--burn)
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BURN_MEDIA=true
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;;
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*)
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;;
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esac
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done
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# Basic checks
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if [[ -z "$SOURCE_DIR" || -z "$DEST_DIR" ]]; then
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usage
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fi
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if [[ ! -d "$SOURCE_DIR" ]]; then
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echo "ERROR: Source directory '$SOURCE_DIR' does not exist."
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exit 1
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fi
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if [[ ! -d "$DEST_DIR" ]]; then
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echo "ERROR: Destination directory '$DEST_DIR' does not exist."
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exit 1
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fi
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# Prompt for GPG passphrase (don't store in script for security).
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echo -n "Enter GPG passphrase (will not be displayed): "
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read -s GPG_PASSPHRASE
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echo
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# Create a working directory inside DEST_DIR for the backup process
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WORK_DIR="${DEST_DIR}/backup_$(date +%Y%m%d_%H%M%S)"
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mkdir -p "$WORK_DIR"
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cd "$WORK_DIR"
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echo "=== Step 1: Create a compressed TAR archive and encrypt it with GPG ==="
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echo "Creating encrypted archive. This may take a while depending on your data size..."
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# We tar, compress, and encrypt in a single pipeline.
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# tar -cf - : stream archive
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# xz -c -9 : compress with xz at high compression
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# gpg -c : symmetric encrypt, using passphrase
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#
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# Adjust cipher-algo or compression level (-9) as needed.
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tar -cf - "$SOURCE_DIR" \
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| xz -c -9 \
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| gpg --batch --yes --cipher-algo AES256 --passphrase "$GPG_PASSPHRASE" -c \
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> "${ENCRYPTED_ARCHIVE_NAME}"
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echo "=== Step 2: Split the encrypted archive into $CHUNK_SIZE chunks ==="
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split -b "$CHUNK_SIZE" -a 3 "${ENCRYPTED_ARCHIVE_NAME}" "${ENCRYPTED_ARCHIVE_NAME}."
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# Remove the single large file to save space (optional).
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rm -f "${ENCRYPTED_ARCHIVE_NAME}"
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echo "=== Step 3: Generate checksums and a manifest/catalog ==="
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touch "${MANIFEST_NAME}"
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echo "Backup Manifest - $(date)" >> "${MANIFEST_NAME}"
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echo "Source directory: $SOURCE_DIR" >> "${MANIFEST_NAME}"
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echo "Destination directory: $DEST_DIR" >> "${MANIFEST_NAME}"
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echo "Split chunk size: $CHUNK_SIZE" >> "${MANIFEST_NAME}"
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echo "Encrypted archive chunk names:" >> "${MANIFEST_NAME}"
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echo >> "${MANIFEST_NAME}"
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for chunk in ${ENCRYPTED_ARCHIVE_NAME}.*; do
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CHUNK_SHA256=$(compute_sha256 "$chunk")
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echo "$CHUNK_SHA256" >> "${MANIFEST_NAME}"
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done
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echo "Manifest created at: ${WORK_DIR}/${MANIFEST_NAME}"
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# If ISO creation is requested
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if [ "$CREATE_ISO" = true ]; then
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echo "=== Step 4: Create an ISO for each chunk (for easier burning) ==="
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# We'll place ISOs in a subfolder
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mkdir -p iso_chunks
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for chunk in ${ENCRYPTED_ARCHIVE_NAME}.*; do
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ISO_BASENAME="${chunk}.iso"
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# Create a temporary directory to hold the chunk file
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mkdir -p temp_dir
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cp "$chunk" temp_dir/
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# Build an ISO with a single file inside:
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genisoimage -o "iso_chunks/${ISO_BASENAME}" -V "ENCRYPTED_BACKUP" temp_dir >/dev/null 2>&1 || \
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mkisofs -o "iso_chunks/${ISO_BASENAME}" -V "ENCRYPTED_BACKUP" temp_dir
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# Remove the temporary directory
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rm -rf temp_dir
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done
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echo "ISO files created under: ${WORK_DIR}/iso_chunks"
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fi
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# If burning is requested, attempt to burn right away.
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# For cross-platform compatibility, we'll provide examples.
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# You may need to adapt device names (/dev/sr0, /dev/dvd, etc.).
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if [ "$BURN_MEDIA" = true ]; then
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echo "=== Step 5: Burn chunks/ISOs to M-Disc ==="
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# Example using growisofs on Linux:
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# growisofs -Z /dev/sr0=chunk_or_iso
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# or:
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# growisofs -use-the-force-luke=dao -speed=2 -Z /dev/sr0=chunk_or_iso
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# Example using hdiutil on macOS for ISO:
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# hdiutil burn chunk.iso
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echo "Attempting to burn each chunk (or ISO) to M-Disc. Please ensure a blank M-Disc is loaded each time."
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if [ "$CREATE_ISO" = true ]; then
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# We have ISO images
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for iso_file in iso_chunks/*.iso; do
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echo "Insert new disc for: $iso_file"
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read -p "Press [Enter] when ready to burn..."
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# Linux (growisofs) example:
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if command -v growisofs >/dev/null 2>&1; then
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growisofs -Z /dev/sr0="$iso_file"
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elif [[ "$OSTYPE" == "darwin"* ]]; then
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# macOS example using hdiutil
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hdiutil burn "$iso_file"
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else
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echo "No known burner command found. Please burn manually: $iso_file"
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fi
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done
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else
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# Burn the chunk files directly.
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for chunk in ${ENCRYPTED_ARCHIVE_NAME}.*; do
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echo "Insert new disc for: $chunk"
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read -p "Press [Enter] when ready to burn..."
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if command -v growisofs >/dev/null 2>&1; then
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growisofs -Z /dev/sr0="$chunk"
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elif [[ "$OSTYPE" == "darwin"* ]]; then
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# We can't directly burn a raw file with hdiutil. Typically you'd create an ISO first.
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# So warn the user.
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echo "On macOS, please create an ISO or use a separate burning tool for: $chunk"
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else
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echo "No known burner command found. Please burn manually: $chunk"
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fi
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done
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fi
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echo "Burning process completed. Verify your discs for peace of mind."
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fi
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echo "=== All done! ==="
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echo "Your backup chunks and manifest are in: ${WORK_DIR}"
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echo "Keep the manifest safe. You'll need all chunk files + passphrase to restore."
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exit 0
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