1a8f9ca2e3
* Avoid waiting for external drive unnecessarily Even though the condition to start hassos-data.service is not met (the file /mnt/overlay/data-move is not there by default), it seems that systemd waits for the dependencies for hassos-data.service. Don't Require or Wants any dependencies which might not be present by default. * Use systemd to wait for partition using partlabel device * Use sfdisk which allows to wipe filesystem signatures Even though we zap the partition table using sgdisk, the file system superblock (which contains the file system label) does survive. This can cause problems when trying to reuse a disk previously already labeled using hassos-data: It might take precendence on next boot over the existing data partition on the eMMC. Make sure to clean all file system signatures using sfdisk.
44 lines
1.9 KiB
Bash
Executable File
44 lines
1.9 KiB
Bash
Executable File
#!/bin/sh
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# ==============================================================================
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# Home Assistant OS data partition migration script
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# ==============================================================================
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set -e
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# Rely on systemd-udev symlinks to find current data partition by fs label
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OLD_DEVICE_CHILD="$(readlink -f "/dev/disk/by-label/hassos-data")"
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# We cannot rely on systemd Wants/Requires since this is evaluated before
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# ConditionPathExists, and would make us wait for an external device on
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# every boot.
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# Instead, just start the unit here, which makes sure a device with the
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# partlabel "hassos-data-external" is present.
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if ! systemctl start "dev-disk-by\\x2dpartlabel-hassos\\x2ddata\\x2dexternal.device"; then
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echo "[ERROR] External data device ${NEW_DEVICE} not found!"
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exit 1
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fi
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# Rely on systemd-udev symlinks to find external data partition by partlabel
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NEW_DEVICE_CHILD="$(readlink -f "/dev/disk/by-partlabel/hassos-data-external")"
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NEW_DEVICE_PART_SIZE=$(cat "/sys/class/block/$(basename "${NEW_DEVICE_CHILD}")/size")
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OLD_DEVICE_PART_SIZE=$(cat "/sys/class/block/$(basename "${OLD_DEVICE_CHILD}")/size")
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if [ "${NEW_DEVICE_PART_SIZE}" -lt "${OLD_DEVICE_PART_SIZE}" ]; then
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echo "[INFO] Target device too small!"
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exit 1
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fi
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echo "[INFO] Moving data from ${OLD_DEVICE_CHILD} to ${NEW_DEVICE_CHILD}"
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if ! e2image -ra -p "${OLD_DEVICE_CHILD}" "${NEW_DEVICE_CHILD}"; then
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echo "[ERROR] Copying data partition to external device failed!"
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# Rename partition to make sure HAOS does not try to mount a failed copy attempt.
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e2label "${NEW_DEVICE_CHILD}" hassos-data-failed || true
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exit 1
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fi
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# At this point we have two partition with the same fs label. Make sure
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# to rename the internal partition so we won't mount it anymore.
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echo "[INFO] Rename old hassos-data partition ${OLD_DEVICE_CHILD}"
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e2label "${OLD_DEVICE_CHILD}" hassos-data-old
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echo "[INFO] Data move has been completed successfully"
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