From 142721a52fd9c8478ad21d0d0ad2e46655f7f8c7 Mon Sep 17 00:00:00 2001
From: Doug MacEachern <dougm@hyperic.com>
Date: Thu, 8 Dec 2005 20:46:09 +0000
Subject: [PATCH] provide option to use sudo to read the file

---
 .../java/src/net/hyperic/sigar/FileTail.java  | 22 +++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/bindings/java/src/net/hyperic/sigar/FileTail.java b/bindings/java/src/net/hyperic/sigar/FileTail.java
index 21b60839..2c90cf0b 100644
--- a/bindings/java/src/net/hyperic/sigar/FileTail.java
+++ b/bindings/java/src/net/hyperic/sigar/FileTail.java
@@ -2,11 +2,18 @@ package net.hyperic.sigar;
 
 import java.io.FileReader;
 import java.io.IOException;
+import java.io.InputStreamReader;
 import java.io.Reader;
 import java.util.HashMap;
 
 public abstract class FileTail extends FileWatcher {
 
+    public static final String PROP_USE_SUDO =
+        "sigar.tail.sudo";
+
+    private boolean useSudo = 
+        "true".equals(System.getProperty(PROP_USE_SUDO));
+
     private HashMap offsets = new HashMap();
     
     public abstract void tail(FileInfo info, Reader reader);
@@ -15,13 +22,24 @@ public abstract class FileTail extends FileWatcher {
         super(sigar);
     }
 
+    public void useSudo(boolean useSudo) {
+        this.useSudo = useSudo;
+    }
+
     public void onChange(FileInfo info) {
         long len = info.size;
  
         Reader reader = null;
-               
+        String name = info.getName();
+
         try {
-            reader = new FileReader(info.getName());
+            if (this.useSudo) {
+                reader =
+                    new InputStreamReader(new SudoFileInputStream(name));
+            }
+            else {
+                reader = new FileReader(name);
+            }
             reader.skip(getOffset(info));
             tail(info, reader);
             setOffset(info);