Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Resize partition to maximum using parted in non-interactive mode
#!/bin/bash
# example from
# for donkey car
# https://serverfault.com/questions/870594/resize-partition-to-maximum-using-parted-in-non-interactive-mode
set -e
if [[ $# -eq 0 ]] ; then
echo 'please tell me the device to resize as the first parameter, like /dev/sda'
exit 1
fi
if [[ $# -eq 1 ]] ; then
echo 'please tell me the partition number to resize as the second parameter, like 1 in case you mean /dev/sda1 or 4, if you mean /dev/sda2'
exit 1
fi
DEVICE=$1
PARTNR=$2
APPLY=$3
fdisk -l $DEVICE$PARTNR >> /dev/null 2>&1 || (echo "could not find device $DEVICE$PARTNR - please check the name" && exit 1)
CURRENTSIZEB=`fdisk -l $DEVICE$PARTNR | grep "Disk $DEVICE$PARTNR" | cut -d' ' -f5`
CURRENTSIZE=`expr $CURRENTSIZEB / 1024 / 1024`
# So get the disk-informations of our device in question printf %s\\n 'unit MB print list' | parted | grep "Disk /dev/sda we use printf %s\\n 'unit MB print list' to ensure the units are displayed as MB, since otherwise it will vary by disk size ( MB, G, T ) and there is no better way to do this with parted 3 or 4 yet
# then use the 3rd column of the output (disk size) cut -d' ' -f3 (divided by space)
# and finally cut off the unit 'MB' with blanc using tr -d MB
MAXSIZEMB=`printf %s\\n 'unit MB print list' | parted | grep "Disk ${DEVICE}" | cut -d' ' -f3 | tr -d MB`
echo "[ok] would/will resize to from ${CURRENTSIZE}MB to ${MAXSIZEMB}MB "
if [[ "$APPLY" == "apply" ]] ; then
echo "[ok] applying resize operation.."
parted ${DEVICE} resizepart ${PARTNR} ${MAXSIZEMB}
echo "[done]"
else
echo "[WARNING]!: Sandbox mode, i did not size!. Use 'apply' as the 3d parameter to apply the changes"
fi
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.