added sparsecmp.sh

tools/sparsecmp.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# Function to get size of file or block device
+get_size() {
+  if [ -b "$1" ]; then  # Check if input is a block device
+    size=$(sudo blockdev --getsize64 "$1")
+  else  # Assume input is a file
+    size=$(stat --format="%s" "$1")
+  fi
+  echo $size
+}
+
+# Check if at least two arguments are provided
+if [ $# -lt 2 ]; then
+  echo "Usage: $0 <source> <target> [test count]"
+  exit 1
+fi
+
+source="$1"
+target="$2"
+count="${3:-100}"  # Default to 100 tests if not specified
+
+# Ensure the source and target exist
+if [ ! -e "$source" ] || [ ! -e "$target" ]; then
+  echo "Error: Source or target does not exist."
+  exit 1
+fi
+
+size=$(get_size "$source")  # Get size in bytes
+if [ $? -ne 0 ] || [ -z "$size" ] || [ "$size" -eq 0 ]; then
+  echo "Error: Failed to get size of the source."
+  exit 1
+fi
+
+interval=$((size / count))
+
+for ((i=0; i<count; i++)); do
+  offset=$((i * interval))
+  percent=$((i * 100 / count))
+  # Use printf to overwrite the current line with the offset and percentage
+  printf "\r%$(tput cols)s\rComparing at offset $offset... (${percent}%%)"
+  if ! cmp --bytes=1M "$source" "$target" --ignore-initial=$offset > /dev/null 2>&1; then
+    echo -e "\nMismatch or error at offset $offset"
+    exit 1  # Exit after the first mismatch
+  fi
+done
+
+# Clear the line after the loop finishes successfully and print success message
+printf "\r%$(tput cols)s\r"
+echo "No mismatches found."