Merge pull request centic9#57 from shaozhengmao/master

fetch commits from a remote Git repository via ssh protocol authentication

src/main/java/org/dstadler/jgit/porcelain/FetchRemoteCommitsWithSshAuth.java

@@ -0,0 +1,69 @@
+package org.dstadler.jgit.porcelain;
+
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.Session;
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.api.LsRemoteCommand;
+import org.eclipse.jgit.api.TransportConfigCallback;
+import org.eclipse.jgit.api.errors.GitAPIException;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.transport.JschConfigSessionFactory;
+import org.eclipse.jgit.transport.OpenSshConfig;
+import org.eclipse.jgit.transport.SshSessionFactory;
+import org.eclipse.jgit.transport.SshTransport;
+import org.eclipse.jgit.transport.Transport;
+import org.eclipse.jgit.util.FS;
+
+import java.util.Map;
+
+/**
+ * Simple snippet which shows how to fetch commits from a remote Git repository
+ * via ssh protocol authentication.
+ * <p>
+ * Created by zhengmaoshao on 2019/4/3 上午12:38
+ */
+public class FetchRemoteCommitsWithSshAuth
+{
+
+    private static final String REMOTE_URL = "ssh://<user>@<host>:22/<path-to-remote-repo>/";
+
+    public static void main(String[] args) throws GitAPIException {
+
+        final SshSessionFactory sshSessionFactory = new JschConfigSessionFactory()
+        {
+            @Override
+            protected void configure(OpenSshConfig.Host host, Session session) {
+
+            }
+
+            @Override
+            protected JSch createDefaultJSch(FS fs) throws JSchException {
+
+                JSch defaultJSch = super.createDefaultJSch(fs);
+                defaultJSch.addIdentity("/path/to/private_key");
+                return defaultJSch;
+            }
+        };
+
+        LsRemoteCommand lsRemoteCommand = Git.lsRemoteRepository();
+        lsRemoteCommand.setRemote(REMOTE_URL);
+        lsRemoteCommand.setTransportConfigCallback(new TransportConfigCallback()
+        {
+            @Override
+            public void configure(Transport transport) {
+                SshTransport sshTransport = (SshTransport) transport;
+                sshTransport.setSshSessionFactory(sshSessionFactory);
+            }
+        });
+
+        final Map<String, Ref> map = lsRemoteCommand.setHeads(true)
+                .setTags(true)
+                .callAsMap();
+
+        for (Map.Entry<String, Ref> entry : map.entrySet()) {
+            System.out.println("Key: " + entry.getKey()/*eg.refs/heads/develop*/ + ", Ref: " + entry.getValue().getObjectId().getName()/*eg.e16c937848d5c1ad50ef163003c7b076103f7e37*/);
+        }
+
+    }
+}