Avoid double quotes in Git Config

Currently, if a branch is created that has special chars ('#' in the bug),
Config will surround the subsection name with double quotes during
it's toText method which will result in an invalid file after saving the
Config.

Bug: 318249
Change-Id: I0a642f52def42d936869e4aaaeb6999567901001
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java

@@ -4,6 +4,7 @@
  * Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
  * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
+ * Copyright (C) 2010, Mathias Kinzler <mathias.kinzler@sap.com>
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
@@ -47,6 +48,7 @@
 
 package org.eclipse.jgit.lib;
 
+import java.text.MessageFormat;
 import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.Set;
@@ -61,7 +63,7 @@ import org.eclipse.jgit.util.SystemReader;
 /**
  * Test reading of git config
  */
-public class RepositoryConfigTest extends TestCase {
+public class ConfigTest extends TestCase {
 	public void test001_ReadBareKey() throws ConfigInvalidException {
 		final Config c = parse("[foo]\nbar\n");
 		assertEquals(true, c.getBoolean("foo", null, "bar", false));
@@ -351,6 +353,28 @@ public class RepositoryConfigTest extends TestCase {
 		assertTrue("Subsection should contain \"b\"", names.contains("b"));
 	}
 
+	public void testQuotingForSubSectionNames() {
+		String resultPattern = "[testsection \"{0}\"]\n\ttestname = testvalue\n";
+		String result;
+
+		Config config = new Config();
+		config.setString("testsection", "testsubsection", "testname",
+				"testvalue");
+
+		result = MessageFormat.format(resultPattern, "testsubsection");
+		assertEquals(result, config.toText());
+		config.clear();
+
+		config.setString("testsection", "#quotable", "testname", "testvalue");
+		result = MessageFormat.format(resultPattern, "#quotable");
+		assertEquals(result, config.toText());
+		config.clear();
+
+		config.setString("testsection", "with\"quote", "testname", "testvalue");
+		result = MessageFormat.format(resultPattern, "with\\\"quote");
+		assertEquals(result, config.toText());
+	}
+
 	private void assertReadLong(long exp) throws ConfigInvalidException {
 		assertReadLong(exp, String.valueOf(exp));
 	}

org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java

@@ -834,9 +834,15 @@ public class Config {
 				out.append(e.section);
 				if (e.subsection != null) {
 					out.append(' ');
-					out.append('"');
-					out.append(escapeValue(e.subsection));
-					out.append('"');
+					String escaped = escapeValue(e.subsection);
+					// make sure to avoid double quotes here
+					boolean quoted = escaped.startsWith("\"")
+							&& escaped.endsWith("\"");
+					if (!quoted)
+						out.append('"');
+					out.append(escaped);
+					if (!quoted)
+						out.append('"');
 				}
 				out.append(']');
 			} else if (e.section != null && e.name != null) {