initial commit

copy_from_rpi.sh

@@ -0,0 +1,69 @@
+#!/bin/bash
+# copy_from_rpi.sh — usage: sudo ./copy_from_rpi.sh <sdX|/dev/sdX> [outfile.img.xz]
+set -euo pipefail
+
+usage() {
+  cat <<EOF
+Usage: sudo bash ./copy_from_rpi.sh <sdX|/dev/sdX> [outfile.img.xz]
+
+Examples:
+  sudo bash ./copy_from_rpi.sh sdc
+  sudo bash ./copy_from_rpi.sh /dev/sdc rpi-backup.img.xz
+
+Tip: Identify your device with:
+  lsblk
+
+This script will:
+  - Unmount all partitions of the given disk (e.g. /dev/sdc1, /dev/sdc2)
+  - Temporarily set the disk read-only
+  - Clone the entire disk to a compressed xz image
+  - Restore the disk to read/write
+EOF
+}
+
+RAW_DEV_INPUT="${1:-}"
+if [[ -z "${RAW_DEV_INPUT}" || "${RAW_DEV_INPUT}" == "-h" || "${RAW_DEV_INPUT}" == "--help" ]]; then
+  usage
+  exit 1
+fi
+
+# Normalize to /dev/sdX if needed
+if [[ "${RAW_DEV_INPUT}" == /dev/* ]]; then
+  DEV="${RAW_DEV_INPUT}"
+else
+  DEV="/dev/${RAW_DEV_INPUT}"
+fi
+
+# Validate device exists and is a disk (not a partition)
+if [[ ! -b "${DEV}" ]]; then
+  echo "Error: ${DEV} is not a block device." >&2
+  exit 1
+fi
+
+DEV_TYPE=$(lsblk -dn -o TYPE "${DEV}")
+if [[ "${DEV_TYPE}" != "disk" ]]; then
+  echo "Error: ${DEV} is not a disk (TYPE=${DEV_TYPE}). Pass the parent disk, e.g. sdc, not sdc1." >&2
+  exit 1
+fi
+
+OUT="${2:-rpi-$(date +%F).img.xz}"
+
+echo "Source device: $DEV"
+lsblk "$DEV" || true
+
+echo ">> Unmounting partitions…"
+# Try to unmount any mounted partitions of the disk (e.g., /dev/sdc1, /dev/sdc2)
+umount "${DEV}"?* || true
+
+echo ">> Setting read-only…"
+blockdev --setro "$DEV" || true
+
+SIZE=$(lsblk -bdno SIZE "$DEV" 2>/dev/null || echo 0)
+echo ">> Cloning $((SIZE/1024/1024)) MiB -> $OUT"
+dd if="$DEV" bs=4M status=progress | xz -T0 -1 -c > "$OUT"
+
+echo ">> Restoring read/write…"
+blockdev --setrw "$DEV" || true
+
+sha256sum "$OUT" > "$OUT".sha256
+echo "Done: $OUT  (checksum in $OUT.sha256)"