added img extraction hints

Author: winemug

scripts/image/setup.sh

@@ -93,3 +93,15 @@ sudo touch /boot/omnipy-fwupdate
 
 rm /home/pi/.bash_history
 sudo halt
+
+######
+
+sudo umount /dev/sdh1
+sudo umount /dev/sdh2
+#shrink with /g/parted
+sudo dcfldd if=/dev/sdh of=omnipy.img
+#abort as appropriate
+sudo ~/pishrink.sh omnipy.img omnipy2.img
+rm omnipy.img
+mv omnipy2.img omnipy.img
+zip -9 omnipy.zip omnipy.img