From 8c4d7b2c20d2925ad3d61d9938160bc5261ee806 Mon Sep 17 00:00:00 2001
From: ludovicp <ludovicp@localhost>
Date: Wed, 02 Jul 2008 17:38:36 +0000
Subject: [PATCH] Fix to defect 1805: Added options to LDIFdiff to ignore specific attributes or entries when comparing LDIF files. --ignoreattrs (-a) <FILE> --ignoreentries (-e) <FILE> Contribution from Gautam Gopalakrishnan, Sun Microsystems, Inc.

---
 opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-attributes                           |    2 
 opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-entries                              |    4 
 opendj-sdk/opends/src/messages/messages/tools.properties                                                 |   12 +
 opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-attributes.ldif |   41 ++++
 opendj-sdk/opends/tests/unit-tests-testng/src/server/org/opends/server/tools/LDIFDiffTestCase.java       |  297 ++++++++++++++++++++++----------
 opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-entries.ldif    |   35 +++
 opendj-sdk/opends/src/server/org/opends/server/tools/LDIFDiff.java                                       |  128 +++++++++++++
 7 files changed, 412 insertions(+), 107 deletions(-)

diff --git a/opendj-sdk/opends/src/messages/messages/tools.properties b/opendj-sdk/opends/src/messages/messages/tools.properties
index 38562b1..a3e9a83 100644
--- a/opendj-sdk/opends/src/messages/messages/tools.properties
+++ b/opendj-sdk/opends/src/messages/messages/tools.properties
@@ -2359,5 +2359,13 @@
  that the provided trust store exists and that you have read access rights to it
 SEVERE_ERR_CANNOT_READ_KEYSTORE_1611=Cannot access key store '%s'.  Verify \
  that the provided key store exists and that you have read access rights to it
-
-
+INFO_LDIFDIFF_DESCRIPTION_IGNORE_ATTRS_1612=File containing a list of attributes \
+ to ignore when computing the difference
+INFO_LDIFDIFF_DESCRIPTION_IGNORE_ENTRIES_1613=File containing a list of entries (DN) \
+ to ignore when computing the difference
+SEVERE_ERR_LDIFDIFF_CANNOT_READ_FILE_IGNORE_ENTRIES_1614=An error occurred while attempting \
+ to read the file '%s' containing the list of ignored entries: %s
+SEVERE_ERR_LDIFDIFF_CANNOT_READ_FILE_IGNORE_ATTRIBS_1615=An error occurred while attempting \
+ to read the file '%s' containing the list of ignored attributes: %s
+INFO_LDIFDIFF_CANNOT_PARSE_STRING_AS_DN_1616=The string '%s' from file '%s' could \
+ not be parsed as a dn
diff --git a/opendj-sdk/opends/src/server/org/opends/server/tools/LDIFDiff.java b/opendj-sdk/opends/src/server/org/opends/server/tools/LDIFDiff.java
index 1b2cf9e..1d9365f 100644
--- a/opendj-sdk/opends/src/server/org/opends/server/tools/LDIFDiff.java
+++ b/opendj-sdk/opends/src/server/org/opends/server/tools/LDIFDiff.java
@@ -27,15 +27,18 @@
 package org.opends.server.tools;
 import org.opends.messages.Message;
 
-
-
+import java.io.BufferedReader;
+import java.io.FileReader;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintStream;
+import java.util.Collection;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.ListIterator;
 import java.util.TreeMap;
 
 import org.opends.server.core.DirectoryServer;
@@ -45,6 +48,7 @@
 import org.opends.server.types.AttributeType;
 import org.opends.server.types.AttributeValue;
 import org.opends.server.types.DN;
+import org.opends.server.types.DirectoryException;
 import org.opends.server.types.Entry;
 import org.opends.server.types.ExistingFileBehavior;
 import org.opends.server.types.LDIFImportConfig;
@@ -166,6 +170,8 @@
     StringArgument  outputLDIF;
     StringArgument  sourceLDIF;
     StringArgument  targetLDIF;
+    StringArgument  ignoreAttrsFile;
+    StringArgument  ignoreEntriesFile;
 
 
     Message toolDescription = INFO_LDIFDIFF_TOOL_DESCRIPTION.get();
@@ -191,6 +197,18 @@
               INFO_LDIFDIFF_DESCRIPTION_OUTPUT_LDIF.get());
       argParser.addArgument(outputLDIF);
 
+      ignoreAttrsFile = new StringArgument(
+              "ignoreattrs", 'a', "ignoreAttrs", false,
+              false, true, INFO_FILE_PLACEHOLDER.get(), null, null,
+              INFO_LDIFDIFF_DESCRIPTION_IGNORE_ATTRS.get());
+      argParser.addArgument(ignoreAttrsFile);
+
+      ignoreEntriesFile = new StringArgument(
+              "ignoreentries", 'e', "ignoreEntries", false,
+              false, true, INFO_FILE_PLACEHOLDER.get(), null, null,
+              INFO_LDIFDIFF_DESCRIPTION_IGNORE_ENTRIES.get());
+      argParser.addArgument(ignoreEntriesFile);
+
       overwriteExisting =
            new BooleanArgument(
                    "overwriteexisting", 'O',
@@ -314,6 +332,82 @@
       }
     }
 
+    // Read in ignored entries and attributes if any
+    BufferedReader ignReader = null;
+    Collection<DN> ignoreEntries = new HashSet<DN>();
+    Collection<String> ignoreAttrs   = new HashSet<String>();
+
+    if (ignoreAttrsFile.getValue() != null)
+    {
+      try
+      {
+        ignReader = new BufferedReader(
+          new FileReader(ignoreAttrsFile.getValue()));
+        String line = null;
+        while ((line = ignReader.readLine()) != null)
+        {
+          ignoreAttrs.add(line.toLowerCase());
+        }
+        ignReader.close();
+      }
+      catch (Exception e)
+      {
+        Message message = ERR_LDIFDIFF_CANNOT_READ_FILE_IGNORE_ATTRIBS.get(
+                ignoreAttrsFile.getValue(),
+                String.valueOf(e));
+        err.println(message);
+        return 1;
+      }
+      finally
+      {
+        try
+        {
+          ignReader.close();
+        }
+        catch (Exception e) {}
+      }
+    }
+
+    if (ignoreEntriesFile.getValue() != null)
+    {
+      try
+      {
+        ignReader = new BufferedReader(
+          new FileReader(ignoreEntriesFile.getValue()));
+        String line = null;
+        while ((line = ignReader.readLine()) != null)
+        {
+          try
+          {
+            DN dn = DN.decode(line);
+            ignoreEntries.add(dn);
+          }
+          catch (DirectoryException e)
+          {
+            Message message = INFO_LDIFDIFF_CANNOT_PARSE_STRING_AS_DN.get(
+                    line, ignoreEntriesFile.getValue());
+            err.println(message);
+          }
+        }
+        ignReader.close();
+      }
+      catch (Exception e)
+      {
+        Message message = ERR_LDIFDIFF_CANNOT_READ_FILE_IGNORE_ENTRIES.get(
+                ignoreEntriesFile.getValue(),
+                String.valueOf(e));
+        err.println(message);
+        return 1;
+      }
+      finally
+      {
+        try
+        {
+          ignReader.close();
+        }
+        catch (Exception e) {}
+      }
+    }
 
     // Open the source LDIF file and read it into a tree map.
     LDIFReader reader;
@@ -342,7 +436,10 @@
           break;
         }
 
-        sourceMap.put(entry.getDN(), entry);
+        if (! ignoreEntries.contains(entry.getDN()))
+        {
+          sourceMap.put(entry.getDN(), entry);
+        }
       }
     }
     catch (Exception e)
@@ -388,7 +485,10 @@
           break;
         }
 
-        targetMap.put(entry.getDN(), entry);
+        if (! ignoreEntries.contains(entry.getDN()))
+        {
+          targetMap.put(entry.getDN(), entry);
+        }
       }
     }
     catch (Exception e)
@@ -550,7 +650,7 @@
           {
             // The DNs are the same, so check to see if the entries are the
             // same or have been modified.
-            if (writeModify(writer, sourceEntry, targetEntry,
+            if (writeModify(writer, sourceEntry, targetEntry, ignoreAttrs,
                             singleValueChanges.isPresent()))
             {
               differenceFound = true;
@@ -678,6 +778,8 @@
    *                             written.
    * @param  sourceEntry         The source form of the entry.
    * @param  targetEntry         The target form of the entry.
+   * @param  ignoreAttrs         Attributes that are ignored while calculating
+   *                             the differences.
    * @param  singleValueChanges  Indicates whether each attribute-level change
    *                             should be written in a separate modification
    *                             per attribute value.
@@ -689,7 +791,7 @@
    *                       change record.
    */
   private static boolean writeModify(LDIFWriter writer, Entry sourceEntry,
-                                     Entry targetEntry,
+                                     Entry targetEntry, Collection ignoreAttrs,
                                      boolean singleValueChanges)
           throws IOException
   {
@@ -854,6 +956,19 @@
       }
     }
 
+    // Remove ignored attributes
+    if (! ignoreAttrs.isEmpty())
+    {
+      ListIterator<Modification> modIter = modifications.listIterator();
+      while (modIter.hasNext())
+      {
+        String name = modIter.next().getAttribute().getName().toLowerCase();
+        if (ignoreAttrs.contains(name))
+        {
+            modIter.remove();
+        }
+      }
+    }
 
     // Write the modification change record.
     if (modifications.isEmpty())
@@ -902,4 +1017,3 @@
     }
   }
 }
-
diff --git a/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-attributes.ldif b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-attributes.ldif
new file mode 100644
index 0000000..d9d2dcd
--- /dev/null
+++ b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-attributes.ldif
@@ -0,0 +1,41 @@
+dn: dc=example,dc=com
+changetype: modify
+add: o
+o: Example Corp.
+
+dn: ou=Applications,dc=example,dc=com
+changetype: add
+objectClass: top
+objectClass: organizationalUnit
+ou: Applications
+
+dn: ou=Groups,dc=example,dc=com
+changetype: delete
+# objectClass: top
+# objectClass: organizationalUnit
+# ou: Groups
+
+dn: cn=Test User,ou=People,dc=example,dc=com
+changetype: add
+objectClass: person
+objectClass: organizationalPerson
+objectClass: top
+objectClass: inetOrgPerson
+cn: Test User
+sn: User
+uid: test.user
+userPassword: password
+givenName: Test
+
+dn: uid=test.user,ou=People,dc=example,dc=com
+changetype: delete
+# objectClass: person
+# objectClass: organizationalPerson
+# objectClass: top
+# objectClass: inetOrgPerson
+# cn: Test User
+# sn: User
+# uid: test.user
+# userPassword: password
+# givenName: Test
+
diff --git a/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-entries.ldif b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-entries.ldif
new file mode 100644
index 0000000..c7cf5d8
--- /dev/null
+++ b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/diff-multipleentries-ignore-entries.ldif
@@ -0,0 +1,35 @@
+dn: dc=example,dc=com
+changetype: modify
+delete: objectClass
+objectClass: domain
+-
+add: objectClass
+objectClass: organization
+objectClass: dcObject
+-
+add: o
+o: Example Corp.
+-
+add: description
+description: description 1
+description: description 2
+description: description 3
+
+dn: ou=Applications,dc=example,dc=com
+changetype: add
+objectClass: top
+objectClass: organizationalUnit
+ou: Applications
+
+dn: cn=Test User,ou=People,dc=example,dc=com
+changetype: add
+objectClass: person
+objectClass: organizationalPerson
+objectClass: top
+objectClass: inetOrgPerson
+cn: Test User
+sn: User
+uid: test.user
+userPassword: password
+givenName: Test
+
diff --git a/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-attributes b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-attributes
new file mode 100644
index 0000000..4fd63cd
--- /dev/null
+++ b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-attributes
@@ -0,0 +1,2 @@
+description
+objectcLASs
diff --git a/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-entries b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-entries
new file mode 100644
index 0000000..abea341
--- /dev/null
+++ b/opendj-sdk/opends/tests/unit-tests-testng/resource/ldif-diff/ignore-entries
@@ -0,0 +1,4 @@
+OU=PEOpLE,Dc=exaMPLE,DC=COM
+uid=test.user,ou=People,dc=example,dc=com
+a b c
+ou=Groups, dc=example, dc=com
diff --git a/opendj-sdk/opends/tests/unit-tests-testng/src/server/org/opends/server/tools/LDIFDiffTestCase.java b/opendj-sdk/opends/tests/unit-tests-testng/src/server/org/opends/server/tools/LDIFDiffTestCase.java
index caa0889..96294c1 100644
--- a/opendj-sdk/opends/tests/unit-tests-testng/src/server/org/opends/server/tools/LDIFDiffTestCase.java
+++ b/opendj-sdk/opends/tests/unit-tests-testng/src/server/org/opends/server/tools/LDIFDiffTestCase.java
@@ -77,6 +77,27 @@
   }
 
 
+  /**
+   * Calculates the checksum of a file
+   */
+  private long calcChecksum(String filename) throws Exception
+  {
+    return calcChecksum(new File(filename));
+  }
+
+  private long calcChecksum(File file) throws Exception
+  {
+    long checksum = 0L;
+    BufferedReader reader = new BufferedReader(new FileReader(file));
+    String line = null;
+    while ((line =reader.readLine()) != null)
+    {
+      checksum += line.hashCode();
+    }
+    reader.close();
+    return checksum;
+  }
+
 
   /**
    * Tests the LDIFDiff tool with an argument that will simply cause it to
@@ -234,8 +255,6 @@
   }
 
 
-
-
   /**
    * Tests the LDIFDiff tool with the provided information to ensure that the
    * normal mode of operation works as expected.  This is a bit tricky because
@@ -285,29 +304,7 @@
     }
 
     assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 0);
-
-    long outputChecksum = 0L;
-    BufferedReader reader = new BufferedReader(new FileReader(outputFile));
-    String line = reader.readLine();
-    while (line != null)
-    {
-      outputChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    long expectedChecksum = 0L;
-    reader = new BufferedReader(new FileReader(normalDiffFile));
-    line = reader.readLine();
-    while (line != null)
-    {
-      expectedChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    assertEquals(outputChecksum, expectedChecksum);
-
+    assertEquals(calcChecksum(outputFile), calcChecksum(normalDiffFile));
     outputFile.delete();
   }
 
@@ -364,29 +361,7 @@
     }
 
     assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 0);
-
-    long outputChecksum = 0L;
-    BufferedReader reader = new BufferedReader(new FileReader(outputFile));
-    String line = reader.readLine();
-    while (line != null)
-    {
-      outputChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    long expectedChecksum = 0L;
-    reader = new BufferedReader(new FileReader(singleValueDiffFile));
-    line = reader.readLine();
-    while (line != null)
-    {
-      expectedChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    assertEquals(outputChecksum, expectedChecksum);
-
+    assertEquals(calcChecksum(outputFile), calcChecksum(singleValueDiffFile));
     outputFile.delete();
   }
 
@@ -470,31 +445,7 @@
     };
 
     assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 0);
-
-
-    // Read the contents of the new diff file and make sure it matches the
-    // contents of the "no changes" diff file.
-    long newDiffChecksum = 0L;
-    BufferedReader reader = new BufferedReader(new FileReader(newDiffFile));
-    String line = reader.readLine();
-    while (line != null)
-    {
-      newDiffChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    long expectedChecksum = 0L;
-    reader = new BufferedReader(new FileReader(noDiffsFile));
-    line = reader.readLine();
-    while (line != null)
-    {
-      expectedChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    assertEquals(newDiffChecksum, expectedChecksum);
+    assertEquals(calcChecksum(newDiffFile), calcChecksum(noDiffsFile));
 
     diffOutputFile.delete();
     newTargetFile.delete();
@@ -582,35 +533,185 @@
     };
 
     assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 0);
-
-
-    // Read the contents of the new diff file and make sure it matches the
-    // contents of the "no changes" diff file.
-    long newDiffChecksum = 0L;
-    BufferedReader reader = new BufferedReader(new FileReader(newDiffFile));
-    String line = reader.readLine();
-    while (line != null)
-    {
-      newDiffChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    long expectedChecksum = 0L;
-    reader = new BufferedReader(new FileReader(noDiffsFile));
-    line = reader.readLine();
-    while (line != null)
-    {
-      expectedChecksum += line.hashCode();
-      line = reader.readLine();
-    }
-    reader.close();
-
-    assertEquals(newDiffChecksum, expectedChecksum);
+    assertEquals(calcChecksum(newDiffFile), calcChecksum(noDiffsFile));
 
     diffOutputFile.delete();
     newTargetFile.delete();
     newDiffFile.delete();
   }
+
+
+  /**
+   * Retrieves the names of the files that should be used when testing the
+   * ldif-diff tool.  Each element of the outer array should be an array
+   * containing the following elements:
+   * <OL>
+   *   <LI>The path to the source LDIF file</LI>
+   *   <LI>The path to the target LDIF file</LI>
+   *   <LI>The path to the file with attributes to be ignored</LI>
+   *   <LI>The path to the diff file</LI>
+   * </OL>
+   */
+  @DataProvider(name = "ignoreattributesdata")
+  public Object[][] getIATestData()
+  {
+    String buildRoot = System.getProperty(TestCaseUtils.PROPERTY_BUILD_ROOT);
+    String ldifRoot  = buildRoot + File.separator + "tests" + File.separator +
+                       "unit-tests-testng" + File.separator + "resource" +
+                       File.separator + "ldif-diff" + File.separator;
+
+    return new Object[][]
+    {
+      // Make changes to multiple entries in the target->source direction.
+      new Object[] { ldifRoot + "source-multipleentries.ldif",
+                     ldifRoot + "target-multipleentries.ldif",
+                     ldifRoot + "ignore-attributes",
+                     ldifRoot + "diff-multipleentries-ignore-attributes.ldif" },
+
+      new Object[] { ldifRoot + "source-multipleentries.ldif",
+                     ldifRoot + "target-multipleentries.ldif",
+                     ldifRoot + "does-not-exist",
+                     ldifRoot + "diff-multipleentries-ignore-attributes.ldif" }
+    };
+
+  }
+
+
+
+  /**
+   * Tests the LDIFDiff tool with the provided information to ensure that the
+   * normal mode of operation works as expected.  This is a bit tricky because
+   * the attributes and values will be written in an indeterminite order, so we
+   * can't just use string equality.  We'll have to use a crude checksum
+   * mechanism to test whether they are equal.  Combined with other methods in
+   * this class, this should be good enough.
+   *
+   * @param  sourceFile           The path to the file containing the source
+   *                              data set.
+   * @param  targetFile           The path to the file containing the target
+   *                              data set.
+   * @param  normalDiffFile       The path to the file containing the expected
+   *                              diff in "normal" form (at most one record per
+   *                              entry), or {@code null} if the diff is
+   *                              supposed to fail.
+   * @throws  Exception  If an unexpected problem occurs.
+   */
+  @Test(dataProvider = "ignoreattributesdata")
+  public void testVerifyIgnoreAttributes(String sourceFile, String targetFile,
+                               String ignoreAttributesFile,
+                               String normalDiffFile)
+         throws Exception
+  {
+    File outputFile = File.createTempFile("difftest", "ldif");
+    outputFile.deleteOnExit();
+
+    String[] args =
+    {
+      "-s", sourceFile,
+      "-t", targetFile,
+      "-a", ignoreAttributesFile,
+      "-o", outputFile.getAbsolutePath(),
+      "-O"
+    };
+
+    if (ignoreAttributesFile.endsWith("/does-not-exist"))
+    {
+      // We expect this to fail, so just make sure that it does.
+      assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 1);
+      return;
+    }
+
+    assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 0);
+    assertEquals(calcChecksum(outputFile), calcChecksum(normalDiffFile));
+
+    outputFile.delete();
+  }
+
+
+  /**
+   * Retrieves the names of the files that should be used when testing the
+   * ldif-diff tool.  Each element of the outer array should be an array
+   * containing the following elements:
+   * <OL>
+   *   <LI>The path to the source LDIF file</LI>
+   *   <LI>The path to the target LDIF file</LI>
+   *   <LI>The path to the file with entries to be ignored</LI>
+   *   <LI>The path to the diff file</LI>
+   * </OL>
+   */
+  @DataProvider(name = "ignoreentriesdata")
+  public Object[][] getIETestData()
+  {
+    String buildRoot = System.getProperty(TestCaseUtils.PROPERTY_BUILD_ROOT);
+    String ldifRoot  = buildRoot + File.separator + "tests" + File.separator +
+                       "unit-tests-testng" + File.separator + "resource" +
+                       File.separator + "ldif-diff" + File.separator;
+
+    return new Object[][]
+    {
+      // Make changes to multiple entries in the target->source direction.
+      new Object[] { ldifRoot + "source-multipleentries.ldif",
+                     ldifRoot + "target-multipleentries.ldif",
+                     ldifRoot + "ignore-entries",
+                     ldifRoot + "diff-multipleentries-ignore-entries.ldif" },
+
+      new Object[] { ldifRoot + "source-multipleentries.ldif",
+                     ldifRoot + "target-multipleentries.ldif",
+                     ldifRoot + "does-not-exist",
+                     ldifRoot + "diff-multipleentries-ignore-entries.ldif" }
+    };
+
+  }
+
+
+
+  /**
+   * Tests the LDIFDiff tool with the provided information to ensure that the
+   * normal mode of operation works as expected.  This is a bit tricky because
+   * the attributes and values will be written in an indeterminite order, so we
+   * can't just use string equality.  We'll have to use a crude checksum
+   * mechanism to test whether they are equal.  Combined with other methods in
+   * this class, this should be good enough.
+   *
+   * @param  sourceFile           The path to the file containing the source
+   *                              data set.
+   * @param  targetFile           The path to the file containing the target
+   *                              data set.
+   * @param  normalDiffFile       The path to the file containing the expected
+   *                              diff in "normal" form (at most one record per
+   *                              entry), or {@code null} if the diff is
+   *                              supposed to fail.
+   * @throws  Exception  If an unexpected problem occurs.
+   */
+  @Test(dataProvider = "ignoreentriesdata")
+  public void testVerifyIgnoreEntries(String sourceFile, String targetFile,
+                               String ignoreEntriesFile,
+                               String normalDiffFile)
+         throws Exception
+  {
+    File outputFile = File.createTempFile("difftest", "ldif");
+    outputFile.deleteOnExit();
+
+    String[] args =
+    {
+      "-s", sourceFile,
+      "-t", targetFile,
+      "-e", ignoreEntriesFile,
+      "-o", outputFile.getAbsolutePath(),
+      "-O"
+    };
+
+    if (ignoreEntriesFile.endsWith("/does-not-exist"))
+    {
+      // We expect this to fail, so just make sure that it does.
+      assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 1);
+      return;
+    }
+
+    assertEquals(LDIFDiff.mainDiff(args, true, System.out, System.err), 0);
+    assertEquals(calcChecksum(outputFile), calcChecksum(normalDiffFile));
+
+    outputFile.delete();
+  }
 }
 

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