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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,136 @@ # How to Shrink the Cloned Raspberry Pi Image (Linux-only) These methods create an image file that is equal to the total capacity of the SD card. For example, cloning an SD card with a capacity of 32GB will create an image file of 32 GB, even if only 5 GB is actually in use on the card. This is fine if you only have one or two such images, but any more than that (especially if you use an SSD) will cause you to run out of space. Unfortunately, this tool is only available on Linux. If you do not have Linux installed, you can install the latest version of Ubuntu or Linux Mint in a virtual machine, and run this script there: ### shrink.sh ```bash #!/bin/bash usage() { echo "Usage: $0 [-s] imagefile.img [newimagefile.img]"; exit -1; } should_skip_autoexpand=false while getopts ":s" opt; do case "${opt}" in s) should_skip_autoexpand=true ;; *) usage ;; esac done shift $((OPTIND-1)) #Args img=$1 #Usage checks if [[ -z $img ]]; then usage fi if [[ ! -e $img ]]; then echo "ERROR: $img is not a file..." exit -2 fi if (( EUID != 0 )); then echo "ERROR: You need to be running as root." exit -3 fi #Check that what we need is installed A=`which parted 2>&1` if (( $? != 0 )); then echo "ERROR: parted is not installed." exit -4 fi #Copy to new file if requested if [ -n "$2" ]; then echo "Copying $1 to $2..." cp --reflink=auto --sparse=always "$1" "$2" if (( $? != 0 )); then echo "ERROR: Could not copy file..." exit -5 fi img=$2 fi #Gather info beforesize=`ls -lah $img | cut -d ' ' -f 5` partnum=`parted -m $img unit B print | tail -n 1 | cut -d ':' -f 1 | tr -d '\n'` partstart=`parted -m $img unit B print | tail -n 1 | cut -d ':' -f 2 | tr -d 'B\n'` loopback=`losetup -f --show -o $partstart $img` currentsize=`tune2fs -l $loopback | grep 'Block count' | tr -d ' ' | cut -d ':' -f 2 | tr -d '\n'` blocksize=`tune2fs -l $loopback | grep 'Block size' | tr -d ' ' | cut -d ':' -f 2 | tr -d '\n'` #Check if we should make pi expand rootfs on next boot if [ "$should_skip_autoexpand" = false ]; then #Make pi expand rootfs on next boot mountdir=`mktemp -d` mount $loopback $mountdir if [ `md5sum $mountdir/etc/rc.local | cut -d ' ' -f 1` != "a27a4d8192ea6ba713d2ddd15a55b1df" ]; then echo Creating new /etc/rc.local mv $mountdir/etc/rc.local $mountdir/etc/rc.local.bak ###Do not touch the following 6 lines including EOF### cat <<\EOF > $mountdir/etc/rc.local #!/bin/bash /usr/bin/raspi-config --expand-rootfs rm -f /etc/rc.local; cp -f /etc/rc.local.bak /etc/rc.local; reboot exit 0 EOF ###End no touch zone### chmod +x $mountdir/etc/rc.local fi umount $mountdir else echo Skipping autoexpanding process... fi #Make sure filesystem is ok e2fsck -f $loopback minsize=`resize2fs -P $loopback | cut -d ':' -f 2 | tr -d ' ' | tr -d '\n'` if [[ $currentsize -eq $minsize ]]; then echo ERROR: Image already shrunk to smallest size exit -6 fi #Add some free space to the end of the filesystem if [[ `expr $currentsize - $minsize - 5000` -gt 0 ]]; then minsize=`expr $minsize + 5000 | tr -d '\n'` elif [[ `expr $currentsize - $minsize - 1000` -gt 0 ]]; then minsize=`expr $minsize + 1000 | tr -d '\n'` elif [[ `expr $currentsize - $minsize - 100` -gt 0 ]]; then minsize=`expr $minsize + 100 | tr -d '\n'` fi #Shrink filesystem resize2fs -p $loopback $minsize if [[ $? != 0 ]]; then echo ERROR: resize2fs failed... mount $loopback $mountdir mv $mountdir/etc/rc.local.bak $mountdir/etc/rc.local umount $mountdir losetup -d $loopback exit $rc fi sleep 1 #Shrink partition losetup -d $loopback partnewsize=`expr $minsize \* $blocksize | tr -d '\n'` newpartend=`expr $partstart + $partnewsize | tr -d '\n'` part1=`parted $img rm $partnum` part2=`parted $img unit B mkpart primary $partstart $newpartend` #Truncate the file endresult=`parted -m $img unit B print free | tail -1 | cut -d ':' -f 2 | tr -d 'B\n'` truncate -s $endresult $img aftersize=`ls -lah $img | cut -d ' ' -f 5` echo "Shrunk $img from $beforesize to $aftersize" ``` ### Run the script, followed by the name of the image that you want to shrink. ```bash $ chmod +x ./shrink.sh $ sudo ./shrink.sh ./some-image.img ```