[PATCH] Hostname property

[Ernst de Haan]

Hi all,

I've created a patch for Ant that will set an internal property "hostname" to 
the current hostname. See attached diff, generated against Project.java 
revision 1.108.

Output when running ant -verbose:

   ernst@zaphod$ ant -verbose init
   Apache Ant version 1.6alpha compiled on May 29 2002
   Buildfile: build.xml
   Detected Java version: 1.3 in: /usr/local/jdk1.3.1/jre
   Detected OS: FreeBSD
   Detected hostname: zaphod.euronet.nl
   parsing buildfile build.xml with URI =  
file:/usr/home/ernst/jakarta-ant/build.xml
   Project base dir set to: /usr/home/ernst/jakarta-ant


We need the hostname in our projects in order to distinguish between 
host-specific configuration properties (in different property files).


Ernst

-- 
Ernst de Haan
EuroNet Internet B.V.

    "Come to me all who are weary and burdened
        and I will give you rest" -- Jesus Christ

? 0.diff
Index: Project.java
===================================================================
RCS file: /home/cvspublic/jakarta-ant/src/main/org/apache/tools/ant/Project.java,v
retrieving revision 1.108
diff -d -u -r1.108 Project.java
--- Project.java	30 Apr 2002 14:20:16 -0000	1.108
+++ Project.java	29 May 2002 11:23:37 -0000
@@ -57,6 +57,8 @@
 import java.io.File;
 import java.io.InputStream;
 import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 import java.util.Hashtable;
 import java.util.Vector;
 import java.util.Properties;
@@ -242,6 +244,7 @@
      */
     public void init() throws BuildException {
         setJavaVersionProperty();
+        setHostnameProperty();
 
         String defs = "/org/apache/tools/ant/taskdefs/defaults.properties";
 
@@ -772,6 +775,28 @@
             + System.getProperty("java.home"), MSG_VERBOSE);
 
         log("Detected OS: " + System.getProperty("os.name"), MSG_VERBOSE);
+    }
+
+    /**
+     * Sets the <code>hostname</code> property. A verbose log message is
+     * generated to record the hostname and IP address. If the hostname cannot
+     * be determined, then the <code>hostname</code> property is not set.
+     */
+    public void setHostnameProperty() {
+        try {
+            InetAddress localhost = InetAddress.getLocalHost();
+            if (localhost == null) {
+                log("Unable to determine IP address of this host.", MSG_ERR);
+                return;
+            }
+            String hostname = localhost.getHostName();
+            setPropertyInternal("hostname", hostname);
+            log("Detected hostname: " + hostname, MSG_VERBOSE);
+        } catch (UnknownHostException unknownHostException) {
+            log("Unable to determine IP address of this host.", MSG_ERR);
+        } catch (SecurityException securityException) {
+            log("Not allowed to determine IP address of this host.", MSG_ERR);
+        }
     }
 
     /**


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