no need to run as root on macOS, cause we're installing the needed ext2 tools in a user readable path

pishrink.sh

@@ -2,14 +2,6 @@
 
 usage() { echo "Usage: $0 imagefile.img [newimagefile.img]"; exit -1; }
 
-while getopts ":s" opt; do
-  case "${opt}" in
-    s) should_skip_autoexpand=true ;;
-    *) usage ;;
-  esac
-done
-shift $((OPTIND-1))
-
 #Args
 img="$1"
 
@@ -21,10 +13,6 @@ if [[ ! -f "$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
 
 #Check that what we need is installed
 for command in parted losetup tune2fs md5sum e2fsck resize2fs; do
@@ -58,7 +46,6 @@ tune2fs_output=$(tune2fs -l "$loopback")
 currentsize=$(echo "$tune2fs_output" | grep '^Block count:' | tr -d ' ' | cut -d ':' -f 2)
 blocksize=$(echo "$tune2fs_output" | grep '^Block size:' | tr -d ' ' | cut -d ':' -f 2)
 
-
 #Make sure filesystem is ok
 e2fsck -p -f "$loopback"
 minsize=$(resize2fs -P "$loopback" | cut -d ':' -f 2 | tr -d ' ')