冰朔
b7c8642057
Parameterize the raw recovery beacon, add one-time JD resident preparation and return verification, and provide an external ICMP peer for HLDP login, code, branch, and recovery commands.
42 lines
1.2 KiB
Shell
Executable file
42 lines
1.2 KiB
Shell
Executable file
#!/usr/bin/env bash
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set -euo pipefail
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[[ $# -ge 2 && $# -le 3 ]] || {
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echo "usage: clear-native-recovery-beacon.sh <disk> <clear-template> [beacon-lba]" >&2
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exit 64
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}
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disk=$1
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clear_template=$2
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beacon_lba=${3:-68}
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[[ ${beacon_lba} =~ ^[0-9]+$ ]]
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[[ -f ${clear_template} ]]
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[[ $(stat -c %s "${clear_template}" 2>/dev/null || stat -f %z "${clear_template}") -eq 1024 ]]
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if [[ -b ${disk} ]]; then
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[[ ${EUID} -eq 0 ]]
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[[ $(readlink -f "${disk}") == /dev/vda ]]
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elif [[ ! -f ${disk} ]]; then
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echo "recovery beacon target is neither /dev/vda nor a test disk" >&2
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exit 65
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fi
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readback=$(mktemp)
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trap 'rm -f "${readback}"' EXIT
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dd if="${disk}" of="${readback}" bs=512 skip="${beacon_lba}" count=2 status=none
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if cmp -s "${readback}" "${clear_template}"; then
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echo "GUANGHU_NATIVE_RECOVERY_BEACON_ALREADY_CLEAR"
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exit 0
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fi
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if ! grep -aFq 'guanghu_recovery=ubuntu' "${readback}"; then
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echo "unknown data occupies the recovery beacon sectors" >&2
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exit 65
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fi
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dd if="${clear_template}" of="${disk}" bs=512 seek="${beacon_lba}" count=2 \
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conv=notrunc,fsync status=none
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dd if="${disk}" of="${readback}" bs=512 skip="${beacon_lba}" count=2 status=none
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cmp "${readback}" "${clear_template}"
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echo "GUANGHU_NATIVE_RECOVERY_BEACON_CLEARED"
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