From bb3982edfdb5f8889ea558c3731a284081970b97 Mon Sep 17 00:00:00 2001
From: Csaba Kiraly <csaba.kiraly@gmail.com>
Date: Thu, 24 Nov 2016 15:37:39 +0100
Subject: [PATCH] if shrinking from device, copy only the relevant part

---
 pishrink.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pishrink.sh b/pishrink.sh
index 73b9b6e..45d4d76 100755
--- a/pishrink.sh
+++ b/pishrink.sh
@@ -38,7 +38,13 @@ fi
 #Copy to new file if requested
 if [ -n "$2" ]; then
   echo "Copying $1 to $2..."
-  cp --reflink=auto --sparse=always "$1" "$2"
+  if [[ -f $img ]]; then
+    cp --reflink=auto --sparse=always "$1" "$2"
+  else
+    imgsize=`parted -m $img unit B print | tail -1 | cut -d ':' -f 3 | tr -d 'B\n'`
+    imgsize=`expr $imgsize + 1`
+    dd if="$1" of="$2" conv=sparse count=$imgsize iflag=count_bytes bs=1M
+  fi
   if (( $? != 0 )); then
     echo "ERROR: Could not copy file..."
     exit -5