├── README.md
└── autosizer.sh


/README.md:
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 1 | # RaspberryPi-ImgAutoSizer
 2 | This is a bash script to automatically resize Raspberry Pi images.
 3 | Initially designed with only basic SD cards in mind, NOOBS images will not work.
 4 | 
 5 | Copyright (C) 2017  SirLagz
 6 | 
 7 |     This program is free software: you can redistribute it and/or modify
 8 |     it under the terms of the GNU General Public License as published by
 9 |     the Free Software Foundation, either version 3 of the License, or
10 |     (at your option) any later version.
11 | 
12 |     This program is distributed in the hope that it will be useful,
13 |     but WITHOUT ANY WARRANTY; without even the implied warranty of
14 |     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 |     GNU General Public License for more details.
16 | 
17 |     You should have received a copy of the GNU General Public License
18 |     along with this program.  If not, see <https://www.gnu.org/licenses/>
19 | 


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/autosizer.sh:
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 1 | #!/bin/bash -e
 2 | # Automatic Image file resizer
 3 | # Written by SirLagz
 4 | # https://github.com/SirLagz/RaspberryPi-ImgAutoSizer
 5 | strImgFile=$1
 6 | extraSpaceMB=$2
 7 | 
 8 | if [[ ! $(whoami) =~ "root" ]]; then
 9 | echo ""
10 | echo "**********************************"
11 | echo "*** This should be run as root ***"
12 | echo "**********************************"
13 | echo ""
14 | exit
15 | fi
16 | 
17 | if [[ -z $1 ]]; then
18 | echo "Usage: ./autosizer.sh <Image File> [<extra space in MB>]"
19 | exit
20 | fi
21 | 
22 | if [[ -z $2 ]]; then
23 | extraSpaceMB=4
24 | fi
25 | 
26 | if [[ ! -e $1 || ! $(file $1) =~ "x86" ]]; then
27 | echo "Error : Not an image file, or file doesn't exist"
28 | exit
29 | fi
30 | 
31 | partinfo=`parted -s -m $1 unit B print`
32 | partnumber=`echo "$partinfo" | grep ext4 | awk -F: ' { print $1 } '`
33 | partstart=`echo "$partinfo" | grep ext4 | awk -F: ' { print substr($2,0,length($2)-1) } '`
34 | loopback=`losetup -f --show -o $partstart $1`
35 | e2fsck -f $loopback
36 | minsize=`resize2fs -P $loopback | awk -F': ' ' { print $2 } '`
37 | blocksize=$(dumpe2fs -h $loopback | grep 'Block size' | awk -F': ' ' { print $2 }')
38 | blocksize=${blocksize// /}
39 | 
40 | let minsize=$minsize+$extraSpaceMB*1048576/$blocksize
41 | resize2fs -p $loopback $minsize
42 | sleep 1
43 | losetup -d $loopback
44 | let partnewsize=$minsize*$blocksize
45 | let newpartend=$partstart+$partnewsize
46 | part1=`parted -s $1 rm 2`
47 | part2=`parted -s $1 unit B mkpart primary $partstart $newpartend`
48 | endresult=`parted -s -m $1 unit B print free | tail -1 | awk -F: ' { print substr($2,0,length($2)-1) } '`
49 | truncate -s $endresult $1
50 | 


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