70 lines
1.8 KiB
Bash
70 lines
1.8 KiB
Bash
#!/bin/bash
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# copy_from_rpi.sh — usage: sudo ./copy_from_rpi.sh <sdX|/dev/sdX> [outfile.img.xz]
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set -euo pipefail
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usage() {
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cat <<EOF
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Usage: sudo bash ./copy_from_rpi.sh <sdX|/dev/sdX> [outfile.img.xz]
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Examples:
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sudo bash ./copy_from_rpi.sh sdc
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sudo bash ./copy_from_rpi.sh /dev/sdc rpi-backup.img.xz
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Tip: Identify your device with:
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lsblk
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This script will:
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- Unmount all partitions of the given disk (e.g. /dev/sdc1, /dev/sdc2)
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- Temporarily set the disk read-only
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- Clone the entire disk to a compressed xz image
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- Restore the disk to read/write
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EOF
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}
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RAW_DEV_INPUT="${1:-}"
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if [[ -z "${RAW_DEV_INPUT}" || "${RAW_DEV_INPUT}" == "-h" || "${RAW_DEV_INPUT}" == "--help" ]]; then
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usage
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exit 1
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fi
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# Normalize to /dev/sdX if needed
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if [[ "${RAW_DEV_INPUT}" == /dev/* ]]; then
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DEV="${RAW_DEV_INPUT}"
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else
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DEV="/dev/${RAW_DEV_INPUT}"
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fi
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# Validate device exists and is a disk (not a partition)
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if [[ ! -b "${DEV}" ]]; then
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echo "Error: ${DEV} is not a block device." >&2
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exit 1
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fi
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DEV_TYPE=$(lsblk -dn -o TYPE "${DEV}")
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if [[ "${DEV_TYPE}" != "disk" ]]; then
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echo "Error: ${DEV} is not a disk (TYPE=${DEV_TYPE}). Pass the parent disk, e.g. sdc, not sdc1." >&2
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exit 1
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fi
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OUT="${2:-rpi-$(date +%F).img.xz}"
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echo "Source device: $DEV"
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lsblk "$DEV" || true
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echo ">> Unmounting partitions…"
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# Try to unmount any mounted partitions of the disk (e.g., /dev/sdc1, /dev/sdc2)
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umount "${DEV}"?* || true
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echo ">> Setting read-only…"
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blockdev --setro "$DEV" || true
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SIZE=$(lsblk -bdno SIZE "$DEV" 2>/dev/null || echo 0)
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echo ">> Cloning $((SIZE/1024/1024)) MiB -> $OUT"
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dd if="$DEV" bs=4M status=progress | xz -T0 -1 -c > "$OUT"
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echo ">> Restoring read/write…"
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blockdev --setrw "$DEV" || true
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sha256sum "$OUT" > "$OUT".sha256
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echo "Done: $OUT (checksum in $OUT.sha256)"
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