Check commits for binary data

While some binary data is acceptable, excessive binary files can slow
down repository operations and impact performance. This commit adds a
check to detect and flag binary data in commits, ensuring the
repository remains lean and efficient.

Reference: https://www.redhat.com/en/blog/git-hooks

Change-Id: I39100df9317c32b58a1877a945314d5773bda0ae

Author: jserv

scripts/pre-commit.hook

@@ -117,6 +117,26 @@ else
   exit 1
 fi
 
+# Get staged filenames (added, copied, or modified) into an array.
+FILES=($(git diff --cached --name-only --diff-filter=ACM))
+binary_files=()
+
+for file in "${FILES[@]}"; do
+  # Get MIME info for the file.
+  mime_info=$(file --mime "$file")
+  # Extract a friendly filename (everything before the colon).
+  name=$(file "$file" | cut -d ":" -f1)
+
+  if echo "$mime_info" | grep -qi binary; then
+    binary_files+=("$name")
+    echo "[!] '$name' appears to be a binary blob."
+  fi
+done
+
+if [ "${#binary_files[@]}" -gt 0 ]; then
+  echo "WARNING: Binary data found"
+fi
+
 FILES=$(git diff --cached --name-only --diff-filter=ACMR | grep -E "\.(c|cpp|h)$")
 for FILE in $FILES; do
   nf=$(git checkout-index --temp $FILE | cut -f 1)