Initial Commit

Author: Drewsif

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Drew Bonasera
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+

README

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+# PiShrink #
+PiShrink is a bash script that automatically shrink a pi image that will then resize to the max size of the SD card on boot.
+`Usage: ./pishrink imagefile.img`
+
+## Example ##
+```bash
+[user@localhost PiShrink]$ sudo ./shrink.sh pi.img 
+e2fsck 1.42.9 (28-Dec-2013)
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+/dev/loop1: 88262/1929536 files (0.2% non-contiguous), 842728/7717632 blocks
+resize2fs 1.42.9 (28-Dec-2013)
+resize2fs 1.42.9 (28-Dec-2013)
+Resizing the filesystem on /dev/loop1 to 773603 (4k) blocks.
+Begin pass 2 (max = 100387)
+Relocating blocks             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+Begin pass 3 (max = 236)
+Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+Begin pass 4 (max = 7348)
+Updating inode references     XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+The filesystem on /dev/loop1 is now 773603 blocks long.
+
+Shrunk pi.img from 30G to 3.1G
+```
+
+## Credits ##
+Thanks to SirLagz for the code to shrink http://sirlagz.net/2013/03/10/script-automatic-rpi-image-downsizer/

pishrink.sh

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+#!/bin/bash
+#Args
+img=$1
+
+#Usage checks
+if [[ -z $img ]]; then
+  echo "Usage: $0 imagefile.img"
+  exit -1
+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
+
+#Gather info
+beforesize=`ls -lah $img | cut -d ' ' -f 5`
+partinfo=`parted -m $img unit B print`
+partnumber=`echo "$partinfo" | grep ext4 | awk -F: ' { print $img } '`
+partstart=`echo "$partinfo" | grep ext4 | awk -F: ' { print substr($2,0,length($2)-1) } '`
+loopback=`losetup -f --show -o $partstart $img`
+
+#Make pi expand rootfs on next boot
+mountdir=`mktemp -d`
+mount $loopback $mountdir
+mv $mountdir/etc/rc.local $mountdir/etc/rc.expand.tmp
+cat <<\EOF > $mountdir/etc/rc.local
+#!/bin/sh
+/usr/bin/raspi-config --expand-rootfs; mv -f /etc/rc.expand.tmp /etc/rc.local; reboot
+exit 0
+EOF
+chmod +x $mountdir/etc/rc.local
+umount $loopback
+
+#Shrink filesystem
+e2fsck -f $loopback
+minsize=`resize2fs -P $loopback | awk -F': ' ' { print $2 } '`
+minsize=`echo $minsize+20000 | bc`
+resize2fs -p $loopback $minsize
+sleep 1
+
+#Shrink partition
+losetup -d $loopback
+partnewsize=`echo "$minsize * 4096" | bc`
+newpartend=`echo "$partstart + $partnewsize" | bc`
+part1=`parted $img rm 2`
+part2=`parted $img unit B mkpart primary $partstart $newpartend`
+
+#Truncate the file
+endresult=`parted -m $img unit B print free | tail -1 | awk -F: ' { print substr($2,0,length($2)-1) } '`
+truncate -s $endresult $img
+aftersize=`ls -lah $img | cut -d ' ' -f 5`
+
+echo "Shrunk $img from $beforesize to $aftersize"