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Fix partition resize for MBR (#1149)

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Partition handling for disks with 4k sectors broke partition resizing
when using MBR disk label. It seems that sfdisk doesn't calculate the
last LBA for diks with MBR label. Calculate the last usable LBA ourselfs
in the MBR case.
This commit is contained in:
Stefan Agner 2020-12-31 14:58:21 +01:00 committed by GitHub
parent 581de22a06
commit 0188f24a0d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 2 deletions
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11
buildroot-external/rootfs-overlay/usr/libexec/hassos-expand
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@ -13,6 +13,7 @@ PART_NUM="$(cat "/sys/class/block/${DEVICE_CHILD_NAME}/partition")"
# Get partition label type
PART_TABLE="$(sfdisk -lqJ "${DEVICE_ROOT}")"
PART_LABEL="$(echo "${PART_TABLE}" | jq -r '.partitiontable.label')"
echo "[INFO] Checking if expanding data partition on ${DEVICE_CHILD} is necessary"
if [ "${PART_LABEL}" = "gpt" ]; then
echo "[INFO] Detected GPT partition label on ${DEVICE_ROOT}"
@ -24,15 +25,21 @@ if [ "${PART_LABEL}" = "gpt" ]; then
# Reload partition label to get correct .partitiontable.lastlba
PART_TABLE="$(sfdisk -lqJ "${DEVICE_ROOT}")"
fi
LAST_USABLE_LBA="$(echo "${PART_TABLE}" | jq -r '.partitiontable.lastlba')"
else
echo "[INFO] Detected MBR partition label on ${DEVICE_ROOT}"
fi
LAST_USABLE_LBA="$(echo "${PART_TABLE}" | jq -r '.partitiontable.lastlba')"
# For MBR, we have to calculate the last usable sector by ourselfs
DEVICE_SIZE=$(blockdev --getsize64 "${DEVICE_ROOT}")
SECTOR_SIZE=$(echo "${PART_TABLE}" | jq -r '.partitiontable.sectorsize')
LAST_USABLE_LBA="$((DEVICE_SIZE / SECTOR_SIZE))"
fi
echo "[INFO] Last usable logical block ${LAST_USABLE_LBA}"
# Calculate end of data partition
JQ_FILTER=".partitiontable.partitions[] | select ( .node == \"${DEVICE_CHILD}\" ) | .start + .size"
DATA_PARTITION_END="$(echo "${PART_TABLE}" | jq "${JQ_FILTER}")"
echo "[INFO] Data partition end block ${DATA_PARTITION_END}"
# Need resize? Ignore free space if its less than 8MB/64MB (4k sectors) since
# that could be partition alignment rounding...