Add warning for out-of-date NanoDB package

If the last-modified date for any of the sources is higher than the
last-modified date of the JAR produced by maven, then a warning will be
emitted to make sure the user is aware that her/his changes may not be
in effect.

This modification also fails silently, e.g. if `find` is missing, or if
the user doesn't have the right version of `stat` to support the printf
flag.

nanodb

@@ -4,10 +4,20 @@
 NANODB_SERVER_JAR=`ls target/nanodb-server-*.jar 2>/dev/null`
 if [ -z "$NANODB_SERVER_JAR" ]
 then
-    echo "Can't find NanoDB server JAR file.  Run 'mvn package' to build the project."
+    echo "ERROR: Can't find NanoDB server JAR file.  Run 'mvn package' to build the project."
     exit 1
 fi
 
+# Check if the sources are out of date and warn the user to rerun 'mvn package'.
+{
+  SOURCE_LAST_MODIFIED="$(find src -type f -exec stat \{\} --printf='%Y\n' \; | sort -n -r | head -n 1)"
+  JAR_LAST_MODIFIED="$(stat $NANODB_SERVER_JAR --printf '%Y\n')"
+
+  if [ -n "$SOURCE_LAST_MODIFIED" -a "$SOURCE_LAST_MODIFIED" -gt "$JAR_LAST_MODIFIED" ]; then
+    echo "WARNING: Your jar file is out of date. Please  re-run 'mvn package' to rebuild the project."
+  fi
+} 2>/dev/null
+
 JAVA_OPTS="-Dlog4j.configurationFile=log4j2.properties"
 
 # Server properties can be specified as system-property arguments.  Examples:

ndbc

@@ -4,10 +4,20 @@
 NANODB_SERVER_JAR=`ls target/nanodb-server-*.jar 2>/dev/null`
 if [ -z "$NANODB_SERVER_JAR" ]
 then
-    echo "Can't find NanoDB server JAR file.  Have you built the project?"
+    echo "ERROR: Can't find NanoDB server JAR file.  Run 'mvn package' to build the project."
     exit 1
 fi
 
+# Check if the sources are out of date and warn the user to rerun 'mvn package'.
+{
+  SOURCE_LAST_MODIFIED="$(find src -type f -exec stat \{\} --printf='%Y\n' \; | sort -n -r | head -n 1)"
+  JAR_LAST_MODIFIED="$(stat $NANODB_SERVER_JAR --printf '%Y\n')"
+
+  if [ -n "$SOURCE_LAST_MODIFIED" -a "$SOURCE_LAST_MODIFIED" -gt "$JAR_LAST_MODIFIED" ]; then
+    echo "WARNING: Your jar file is out of date. Please  re-run 'mvn package' to rebuild the project."
+  fi
+} 2>/dev/null
+
 # To set the page-size to use, add "-Dnanodb.pagesize=2048" to JAVA_OPTS.
 # To enable transaction processing, add "-Dnanodb.txns=on" to JAVA_OPTS.
 JAVA_OPTS="-Dlog4j.configurationFile=log4j2.properties"

ndbs

@@ -4,10 +4,20 @@
 NANODB_SERVER_JAR=`ls target/nanodb-server-*.jar 2>/dev/null`
 if [ -z "$NANODB_SERVER_JAR" ]
 then
-    echo "Can't find NanoDB server JAR file.  Have you built the project?"
+    echo "Can't find NanoDB server JAR file.  Run 'mvn package' to build the project."
     exit 1
 fi
 
+# Check if the sources are out of date and warn the user to rerun 'mvn package'.
+{
+  SOURCE_LAST_MODIFIED="$(find src -type f -exec stat \{\} --printf='%Y\n' \; | sort -n -r | head -n 1)"
+  JAR_LAST_MODIFIED="$(stat $NANODB_SERVER_JAR --printf '%Y\n')"
+
+  if [ -n "$SOURCE_LAST_MODIFIED" -a "$SOURCE_LAST_MODIFIED" -gt "$JAR_LAST_MODIFIED" ]; then
+    echo "WARNING: Your jar file is out of date.  Please re-run 'mvn package' to rebuild the project."
+  fi
+} 2>/dev/null
+
 # To set the page-size to use, add "-Dnanodb.pagesize=2048" to JAVA_OPTS.
 # To enable transaction processing, add "-Dnanodb.txns=on" to JAVA_OPTS.
 JAVA_OPTS="-Dlog4j.configurationFile=log4j2.properties"