CheckAndClearXattrs.sh checks a given target directory for extended attributes. If any extended attributes are found, it removes them and displays a dialog. Otherwise, it just logs to the system console. You provide the target directory's path as the first and only argument to this script. I launchd it once an hour, using the file, CheckBuildDir…

CheckAndClearXattrs.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>CheckBuildDirXattrs</string>
	<key>ProgramArguments</key>
	<array>
		<string>/Users/jk/bin/CheckAndClearXattrs.sh</string>
		<string>/Users/jk/Documents/Programming/Builds</string>
	</array>
	<key>StartCalendarInterval</key>
	<dict>
		<key>Minute</key>
		<integer>24</integer>
	</dict>
</dict>
</plist>

CheckAndClearXattrs.sh

#!/bin/bash
 
# This script checks a given target directory for extended attributes.  If any extended attributes are found, it removes them and displays a dialog.  Otherwise, it just logs to the system console.  You provide the target directory's path as the first and only argument to this script.

# You typically schedule this script to run periodically, with a launchd agent or cron job.  I launchd it once an hour.

TARGET=$1
TARGET_NAME=`basename $TARGET`
TARGET_PARENT=`dirname $TARGET`
cd "$TARGET_PARENT"
ATTRS_BEFORE=`xattr -l "$TARGET_NAME"`
if [ "$ATTRS_BEFORE" != "" ]; then
	TITLE="Warning from $0"
	xattr -c "$TARGET_NAME"
	ATTRS_AFTER=`xattr -l "$TARGET_NAME"`
	osascript -e "display dialog \"On this directory:\" & return & \"$TARGET\" & return & return & \"The following undesired xattrs were found:\" & return & \"$ATTRS_BEFORE\" & return & return & \"This script has attempted to remove those xattrs.  After removing, the xattrs are:\" & return & \"$ATTRS_AFTER\"  with title \"$TITLE\""
	logger $0 found xattrs: $ATTRS_BEFORE on $TARGET.  After removing, xattrs are: $ATTRS_AFTER
else
	logger "$0 found 0 xattrs (good!) on $TARGET"
fi