Andreas WredeandClaude Sonnet 5
6999b2d12b
Refreshes the USB disk (sda2) as a live boot-fallback clone of the running root, same self-sync guard/excludes/rsync flags as the SD script. Fixed copy-paste leftovers from sync-sd-backup.sh (SD_ROOT_PART, mount point, and log message all still said "SD"). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YJfEELeh3ercpRBp8yYrYS
50 lines
1.6 KiB
Bash
Executable File
50 lines
1.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Refresh the USB disk (sda) as a live boot-fallback clone of the
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# running root filesystem. Run manually after a push:
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# sudo ./failover/sync-usb-backup.sh
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#
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# EEPROM BOOT_ORDER falls back to the SD card, then this USB disk, if the
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# primary boot disk (NVMe) doesn't come up. /etc/fstab, /etc/machine-id,
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# and /var/log are excluded from the sync so the clone keeps its own
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# partition identity (PARTUUIDs differ per disk) and boot/journal history
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# instead of inheriting the source disk's — see failover/README or repo
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# memory "sd-fallback-fstab-clobber" for what breaks if those leak across.
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set -euo pipefail
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[ "$(id -u)" -eq 0 ] || { echo "Run as root (sudo)." >&2; exit 1; }
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USB_ROOT_PART=/dev/sda2
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MOUNT_POINT=/mnt/usb-backup-root
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root_src=$(findmnt -no SOURCE /)
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if [ "$root_src" = "$USB_ROOT_PART" ]; then
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echo "Currently booted from $USB_ROOT_PART — refusing to sync USB onto itself." >&2
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exit 1
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fi
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mkdir -p "$MOUNT_POINT"
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mounted_here=0
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if ! mountpoint -q "$MOUNT_POINT"; then
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mount "$USB_ROOT_PART" "$MOUNT_POINT"
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mounted_here=1
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else
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mount -o remount,rw "$MOUNT_POINT"
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fi
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cleanup() {
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if [ "$mounted_here" -eq 1 ]; then
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umount "$MOUNT_POINT"
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fi
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}
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trap cleanup EXIT
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rsync -aHAX --numeric-ids --delete \
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--info=progress2 \
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--exclude=/proc/* --exclude=/sys/* --exclude=/dev/* --exclude=/run/* \
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--exclude=/tmp/* --exclude=/mnt/* --exclude=/media/* --exclude=/lost+found \
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--exclude=/boot/firmware/* --exclude=/swapfile \
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--exclude=/etc/fstab --exclude=/etc/machine-id --exclude=/var/log/* \
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--stats / "$MOUNT_POINT/"
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echo "USB backup ($USB_ROOT_PART) synced from $root_src."
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