57 lines
1.5 KiB
Bash
57 lines
1.5 KiB
Bash
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#!/bin/bash
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#Args
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img=$1
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#Usage checks
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if [[ -z $img ]]; then
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echo "Usage: $0 imagefile.img"
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exit -1
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fi
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if [[ ! -e $img ]]; then
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echo "ERROR: $img is not a file..."
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exit -2
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fi
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if (( EUID != 0 )); then
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echo "ERROR: You need to be running as root."
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exit -3
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fi
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#Gather info
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beforesize=`ls -lah $img | cut -d ' ' -f 5`
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partinfo=`parted -m $img unit B print`
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partnumber=`echo "$partinfo" | grep ext4 | awk -F: ' { print $img } '`
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partstart=`echo "$partinfo" | grep ext4 | awk -F: ' { print substr($2,0,length($2)-1) } '`
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loopback=`losetup -f --show -o $partstart $img`
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#Make pi expand rootfs on next boot
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mountdir=`mktemp -d`
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mount $loopback $mountdir
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mv $mountdir/etc/rc.local $mountdir/etc/rc.expand.tmp
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cat <<\EOF > $mountdir/etc/rc.local
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#!/bin/sh
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/usr/bin/raspi-config --expand-rootfs; mv -f /etc/rc.expand.tmp /etc/rc.local; reboot
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exit 0
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EOF
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chmod +x $mountdir/etc/rc.local
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umount $loopback
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#Shrink filesystem
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e2fsck -f $loopback
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minsize=`resize2fs -P $loopback | awk -F': ' ' { print $2 } '`
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minsize=`echo $minsize+20000 | bc`
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resize2fs -p $loopback $minsize
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sleep 1
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#Shrink partition
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losetup -d $loopback
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partnewsize=`echo "$minsize * 4096" | bc`
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newpartend=`echo "$partstart + $partnewsize" | bc`
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part1=`parted $img rm 2`
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part2=`parted $img unit B mkpart primary $partstart $newpartend`
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#Truncate the file
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endresult=`parted -m $img unit B print free | tail -1 | awk -F: ' { print substr($2,0,length($2)-1) } '`
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truncate -s $endresult $img
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aftersize=`ls -lah $img | cut -d ' ' -f 5`
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echo "Shrunk $img from $beforesize to $aftersize"
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