expand_encrypted_rootfs
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Jan Wagner
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r82 | #!/bin/sh | ||
| # expand_encrypted_rootfs initramfs-tools boot script | ||||
| # dependencies: grep awk cut tail fdisk parted e2fsck resize2fs | ||||
| set -e | ||||
| # Wait for USB devices to be ready | ||||
| sleep 5 | ||||
| # Use initramfs utility functions | ||||
| if [ -r "/scripts/functions" ] ; then | ||||
| . /scripts/functions | ||||
| fi | ||||
| # Check for cryptdevice variable | ||||
| if [ -z "$cryptdevice" ] ; then | ||||
| echo "unable to get cryptdevice variable (init-premount)" | ||||
| return 1 | ||||
| fi | ||||
| # Detect root partition device | ||||
| ROOT_PART=$(echo $cryptdevice | awk -F"/|:" '{ print $3 }') | ||||
| if [ -z "$ROOT_PART" ] ; then | ||||
| log_warning_msg "unable to detect encrypted root partition device (cryptdevice)" | ||||
| return 1 | ||||
| fi | ||||
| # Extract root device name | ||||
| case "${ROOT_PART}" in | ||||
| mmcblk0*) ROOT_DEV=mmcblk0 ;; | ||||
| sda*) ROOT_DEV=sda ;; | ||||
| esac | ||||
| # Check detected root partition name | ||||
| PART_NUM=$(echo ${ROOT_PART} | grep -o '[1-9][0-9]*$') | ||||
| if [ "$PART_NUM" = "$ROOT_PART" ] ; then | ||||
| log_warning_msg "$ROOT_PART is not an SD card. Don't know how to expand" | ||||
| return 1 | ||||
| fi | ||||
| # NOTE: the NOOBS partition layout confuses parted. For now, let's only | ||||
| # agree to work with a sufficiently simple partition layout | ||||
| if [ "$PART_NUM" -gt 2 ] ; then | ||||
| log_warning_msg "Your partition layout is not currently supported by this tool." | ||||
| return 1 | ||||
| fi | ||||
| # Check if last partition number | ||||
| LAST_PART_NUM=$(parted /dev/${ROOT_DEV} -ms unit s p | tail -n 1 | cut -f 1 -d:) | ||||
| if [ $LAST_PART_NUM -ne $PART_NUM ]; then | ||||
| log_warning_msg "$ROOT_PART is not the last partition. Don't know how to expand" | ||||
| return 1 | ||||
| fi | ||||
| # Get the starting offset of the root partition | ||||
| PART_START=$(parted /dev/${ROOT_DEV} -ms unit s p | grep "^${PART_NUM}" | cut -f 2 -d: | sed 's/[^0-9]//g') | ||||
| if [ -z "$PART_START" ] ; then | ||||
| log_warning_msg "${ROOT_DEV} unable to get starting sector of the partition" | ||||
| return 1 | ||||
| fi | ||||
| # Get the possible last sector for the root partition | ||||
| PART_LAST=$(fdisk -l /dev/${ROOT_DEV} | grep '^Disk.*sectors' | awk '{ print $7 - 1 }') | ||||
| if [ -z "$PART_LAST" ] ; then | ||||
| log_warning_msg "${ROOT_DEV} unable to get last sector of the partition" | ||||
| return 1 | ||||
| fi | ||||
| ### Since rc.local is run with "sh -e", let's add "|| true" to prevent premature exit | ||||
| fdisk /dev/${ROOT_DEV} 2> /dev/null <<EOF2 || true | ||||
| p | ||||
| d | ||||
| $PART_NUM | ||||
| n | ||||
| p | ||||
| $PART_NUM | ||||
| $PART_START | ||||
| $PART_LAST | ||||
| p | ||||
| w | ||||
| EOF2 | ||||
| partprobe | ||||
| log_success_msg "Root partition successfully resized." | ||||
