Merge branch 'stable-4.9' into stable-4.10

* stable-4.9:
  Retry stale file handles on .git/config file

Change-Id: I6db7256dbd1c71b23e1231809642ca21e996e066
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties

@@ -133,6 +133,7 @@ compressingObjects=Compressing objects
 configSubsectionContainsNewline=config subsection name contains newline
 configSubsectionContainsNullByte=config subsection name contains byte 0x00
 configValueContainsNullByte=config value contains byte 0x00
+configHandleIsStale=config file handle is stale, {0}. retry
 connectionFailed=connection failed
 connectionTimeOut=Connection time out: {0}
 contextMustBeNonNegative=context must be >= 0

org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java

@@ -194,6 +194,7 @@ public class JGitText extends TranslationBundle {
 	/***/ public String configSubsectionContainsNewline;
 	/***/ public String configSubsectionContainsNullByte;
 	/***/ public String configValueContainsNullByte;
+	/***/ public String configHandleIsStale;
 	/***/ public String connectionFailed;
 	/***/ public String connectionTimeOut;
 	/***/ public String contextMustBeNonNegative;

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java

@@ -66,13 +66,19 @@ import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.StoredConfig;
 import org.eclipse.jgit.util.FS;
+import org.eclipse.jgit.util.FileUtils;
 import org.eclipse.jgit.util.IO;
 import org.eclipse.jgit.util.RawParseUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * The configuration file that is stored in the file of the file system.
  */
 public class FileBasedConfig extends StoredConfig {
+	private final static Logger LOG = LoggerFactory
+			.getLogger(FileBasedConfig.class);
+
 	private final File configFile;
 
 	private final FS fs;
@@ -141,21 +147,25 @@ public class FileBasedConfig extends StoredConfig {
 	 */
 	@Override
 	public void load() throws IOException, ConfigInvalidException {
+		final int maxStaleRetries = 5;
+		int retries = 0;
+		while (true) {
 			final FileSnapshot oldSnapshot = snapshot;
 			final FileSnapshot newSnapshot = FileSnapshot.save(getFile());
 			try {
 				final byte[] in = IO.readFully(getFile());
 				final ObjectId newHash = hash(in);
 				if (hash.equals(newHash)) {
-				if (oldSnapshot.equals(newSnapshot))
+					if (oldSnapshot.equals(newSnapshot)) {
 						oldSnapshot.setClean(newSnapshot);
-				else
+					} else {
 						snapshot = newSnapshot;
+					}
 				} else {
 					final String decoded;
 					if (isUtf8(in)) {
-					decoded = RawParseUtils.decode(RawParseUtils.UTF8_CHARSET,
-							in, 3, in.length);
+						decoded = RawParseUtils.decode(
+								RawParseUtils.UTF8_CHARSET, in, 3, in.length);
 						utf8Bom = true;
 					} else {
 						decoded = RawParseUtils.decode(in);
@@ -164,17 +174,31 @@ public class FileBasedConfig extends StoredConfig {
 					snapshot = newSnapshot;
 					hash = newHash;
 				}
+				return;
 			} catch (FileNotFoundException noFile) {
 				if (configFile.exists()) {
 					throw noFile;
 				}
 				clear();
 				snapshot = newSnapshot;
+				return;
 			} catch (IOException e) {
+				if (FileUtils.isStaleFileHandle(e)
+						&& retries < maxStaleRetries) {
+					if (LOG.isDebugEnabled()) {
+						LOG.debug(MessageFormat.format(
+								JGitText.get().configHandleIsStale,
+								Integer.valueOf(retries)), e);
+					}
+					retries++;
+					continue;
+				}
 				throw new IOException(MessageFormat
 						.format(JGitText.get().cannotReadFile, getFile()), e);
 			} catch (ConfigInvalidException e) {
-			throw new ConfigInvalidException(MessageFormat.format(JGitText.get().cannotReadFile, getFile()), e);
+				throw new ConfigInvalidException(MessageFormat
+						.format(JGitText.get().cannotReadFile, getFile()), e);
+			}
 		}
 	}