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PiShrink
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Add safeties 

-/etc/rc.local wont be overwritten if the hash matches what the script will write
-If resize2fs fails the script is aborted
This commit is contained in:
Drew Bonasera 2016-04-19 04:21:22 -04:00
parent 28ce07ba0c
commit 2c6f069c2f
1 changed files with 17 additions and 4 deletions
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21
pishrink.sh
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@ -26,20 +26,33 @@ loopback=`losetup -f --show -o $partstart $img`
#Make pi expand rootfs on next boot #Make pi expand rootfs on next boot
mountdir=`mktemp -d` mountdir=`mktemp -d`
mount $loopback $mountdir mount $loopback $mountdir
mv $mountdir/etc/rc.local $mountdir/etc/rc.expand.tmp
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 cat <<\EOF > $mountdir/etc/rc.local
#!/bin/sh #!/bin/bash
/usr/bin/raspi-config --expand-rootfs; mv -f /etc/rc.expand.tmp /etc/rc.local; reboot /usr/bin/raspi-config --expand-rootfs
rm -f /etc/rc.local; cp -f /etc/rc.local.bak /etc/rc.local; reboot
exit 0 exit 0
EOF EOF
chmod +x $mountdir/etc/rc.local chmod +x $mountdir/etc/rc.local
umount $loopback fi
umount $mountdir
#Shrink filesystem #Shrink filesystem
e2fsck -f $loopback e2fsck -f $loopback
minsize=`resize2fs -P $loopback | awk -F': ' ' { print $2 } '` minsize=`resize2fs -P $loopback | awk -F': ' ' { print $2 } '`
minsize=`echo $minsize+20000 | bc` minsize=`echo $minsize+20000 | bc`
resize2fs -p $loopback $minsize 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 sleep 1
#Shrink partition #Shrink partition