pgm: add command to convert repo to reftable

Change-Id: I2f870699995da164a3e7adec430301ac7a53c425
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm/META-INF/services/org.eclipse.jgit.pgm.TextBuiltin

@@ -8,6 +8,7 @@ org.eclipse.jgit.pgm.Clean
 org.eclipse.jgit.pgm.Clone
 org.eclipse.jgit.pgm.Commit
 org.eclipse.jgit.pgm.Config
+org.eclipse.jgit.pgm.ConvertRefStorage
 org.eclipse.jgit.pgm.Daemon
 org.eclipse.jgit.pgm.Describe
 org.eclipse.jgit.pgm.Diff

org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/internal/CLIText.properties

@@ -326,6 +326,8 @@ usage_configList=List all variables set in config file
 usage_configLocal=use local configuration in .git/config
 usage_configSystem=use system-wide configuration in $(prefix)/etc/gitconfig
 usage_configureTheServiceInDaemonServicename=configure the service in daemon.servicename
+usage_convertRefStorage=Convert ref storage to reftable
+usage_convertRefStorageFormat=Format to convert to (reftable or refdir)
 usage_createBranchAndCheckout=create branch and check out
 usage_deleteBranchEvenIfNotMerged=delete branch (even if not merged)
 usage_deleteFullyMergedBranch=delete fully merged branch

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/ConvertRefStorage.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2019, Google LLC
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.pgm;
+
+import org.eclipse.jgit.internal.storage.file.FileRepository;
+import org.kohsuke.args4j.Option;
+
+@Command(common=true, usage="usage_convertRefStorage")
+class ConvertRefStorage extends TextBuiltin {
+
+    @Option(name = "--format", usage = "usage_convertRefStorageFormat")
+	private String format = "reftable"; //$NON-NLS-1$
+
+    /** {@inheritDoc} */
+    @Override
+    protected void run() throws Exception {
+        ((FileRepository) db).convertRefStorage(format, true, true);
+    }
+}