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Fix growroot device detection

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We are incorrectly detecting major/minor device numbers for the growroot
rootfs. This can also be simplified by querying udev for partition
information.

Change-Id: I68059bf11f2563872f6b4d0e23fa09a15de980a8
This commit is contained in:
Gregory Haynes 2015-12-20 08:23:54 +00:00
parent 3a110bf96f
commit 858fc3db30
1 changed files with 3 additions and 9 deletions
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12
elements/growroot/static/usr/local/sbin/growroot
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@ -5,18 +5,12 @@ set -exu
set -o pipefail
root_dev=$(df -P / | tail -n 1 | awk '/.*/ { print $1 }')
minor_dev_no=$(stat --printf="%T" $root_dev)
major_dev_no=$(stat --printf="%t" $root_dev)
# The last digit of our minor number should, on a partitioned block device,
# be the partition number of the device (starting at 1). We need to convert
# this value to decimal from hex for use in growpart.
part_no=$(echo $minor_dev_no | tail -c 2)
part_no=$((16#$part_no))
disk=$(find /sys/dev/block -name "$((16#$major_dev_no)):${minor_dev_no::-1}0")
disk=$(find /sys/dev/block -name $(udevadm info --query=all --name $root_dev | grep ID_PART_ENTRY_DISK | cut -d= -f2))
disk="/dev/$(source ${disk}/uevent; echo $DEVNAME)"
part_no=$(udevadm info --query=all --name $root_dev | grep ID_PART_ENTRY_NUMBER | cut -d= -f2)
set +e
growpart $disk $part_no
# Error code 1 means no change