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PiShrink
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Merge pull request #5 from rbaumbach/master 

Add getops to script to provide user the ability to skip autoexpanding
This commit is contained in:
Drew Bonasera 2016-07-13 15:44:08 -04:00 committed by GitHub
parent 816e1efa15 cad2e0e11a
commit abb17e217e
2 changed files with 36 additions and 19 deletions
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6
README.md
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@ -1,13 +1,13 @@
# 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. This will make putting the image back onto the SD card faster and the shrunk images will compress better.
`Usage: ./pishrink imagefile.img [newimagefile.img]`
`Usage: ./pishrink [-s] imagefile.img [newimagefile.img]`
If you specify the `newimagefile.img` parameter, the script will make a copy of `imagefile.img` and work off that. You will need enough space to make a full copy of the image to use that option.
If the `-s` option is given the script will skip the autoexpanding part of the process. If you specify the `newimagefile.img` parameter, the script will make a copy of `imagefile.img` and work off that. You will need enough space to make a full copy of the image to use that option.
## Example ##
```bash
[user@localhost PiShrink]$ sudo ./shrink.sh pi.img
[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

49
pishrink.sh
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@ -1,11 +1,23 @@
#!/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
echo "Usage: $0 imagefile.img [newimagefile.img]"
exit -1
usage
fi
if [[ ! -e $img ]]; then
echo "ERROR: $img is not a file..."
@ -42,22 +54,27 @@ 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'`
#Make pi expand rootfs on next boot
mountdir=`mktemp -d`
mount $loopback $mountdir
#Check if we should make pi expand rootfs on next boot
if [ "$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
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
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
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
chmod +x $mountdir/etc/rc.local
chmod +x $mountdir/etc/rc.local
fi
umount $mountdir
else
echo Skipping autoexpanding process...
fi
umount $mountdir
#Make sure filesystem is ok
e2fsck -f $loopback
@ -100,4 +117,4 @@ endresult=`parted -m $img unit B print free | tail -1 | cut -d ':' -f 2 | tr -d
truncate -s $endresult $img
aftersize=`ls -lah $img | cut -d ' ' -f 5`
echo "Shrunk $img from $beforesize to $aftersize"
echo "Shrunk $img from $beforesize to $aftersize"