Introduce SshSupport to centralize SSH related utility code

As discussed with Thomas here:
https://git.eclipse.org/r/#/c/83506/31/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/SmudgeFilter.java@349

Move the code from ConfigureGerritAfterCloneTask to SshSupport and
eliminate the slightly modified copy of the code from
LfsConnectionFactory. Separate EGit commit will eliminate the code from
ConfigureGerritAfterCloneTask.

Change-Id: Ifb5adb1342e0fc1f2a70cddf693408d4e0ef7906
Signed-off-by: Markus Duft <markus.duft@ssi-schaefer.com>

1 files changed, 6 insertions, 46 deletions

diff --git a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsConnectionFactory.java b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsConnectionFactory.java
index 5d8268b73e..25a70c745a 100644
--- a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsConnectionFactory.java
+++ b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsConnectionFactory.java
@@ -47,9 +47,7 @@ import static org.eclipse.jgit.util.HttpSupport.HDR_ACCEPT;
 import static org.eclipse.jgit.util.HttpSupport.HDR_ACCEPT_ENCODING;
 import static org.eclipse.jgit.util.HttpSupport.HDR_CONTENT_TYPE;
 
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStreamReader;
 import java.net.ProxySelector;
 import java.net.URL;
 import java.text.SimpleDateFormat;
@@ -66,20 +64,17 @@ import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.lib.StoredConfig;
 import org.eclipse.jgit.transport.HttpConfig;
 import org.eclipse.jgit.transport.HttpTransport;
-import org.eclipse.jgit.transport.RemoteSession;
-import org.eclipse.jgit.transport.SshSessionFactory;
 import org.eclipse.jgit.transport.URIish;
 import org.eclipse.jgit.transport.http.HttpConnection;
-import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.HttpSupport;
-import org.eclipse.jgit.util.io.MessageWriter;
-import org.eclipse.jgit.util.io.StreamCopyThread;
+import org.eclipse.jgit.util.SshSupport;
 
 /**
  * Provides means to get a valid LFS connection for a given repository.
  */
 public class LfsConnectionFactory {
 
+	private static final int SSH_AUTH_TIMEOUT_SECONDS = 5;
 	private static final String SCHEME_HTTPS = "https"; //$NON-NLS-1$
 	private static final String SCHEME_SSH = "ssh"; //$NON-NLS-1$
 	private static final Map<String, AuthCache> sshAuthCache = new TreeMap<>();
@@ -193,10 +188,11 @@ public class LfsConnectionFactory {
 			// discover and authenticate; git-lfs does "ssh
 			// -p <port> -- <host> git-lfs-authenticate
 			// <project> <upload/download>"
-			String json = runSshCommand(u.setPath(""), //$NON-NLS-1$
-					db.getFS(),
+			String json = SshSupport.runSshCommand(u.setPath(""), //$NON-NLS-1$
+					null, db.getFS(),
 					"git-lfs-authenticate " + extractProjectName(u) + " " //$NON-NLS-1$//$NON-NLS-2$
-							+ purpose);
+							+ purpose,
+					SSH_AUTH_TIMEOUT_SECONDS);
 
 			action = Protocol.gson().fromJson(json,
 					Protocol.ExpiringAction.class);
@@ -253,42 +249,6 @@ public class LfsConnectionFactory {
 		}
 	}
 
-	private static String runSshCommand(URIish sshUri, FS fs, String command)
-			throws IOException {
-		RemoteSession session = null;
-		Process process = null;
-		StreamCopyThread errorThread = null;
-		try (MessageWriter stderr = new MessageWriter()) {
-			session = SshSessionFactory.getInstance().getSession(sshUri, null,
-					fs, 5_000);
-			process = session.exec(command, 0);
-			errorThread = new StreamCopyThread(process.getErrorStream(),
-					stderr.getRawStream());
-			errorThread.start();
-			try (BufferedReader reader = new BufferedReader(
-					new InputStreamReader(process.getInputStream(),
-							org.eclipse.jgit.lib.Constants.CHARSET))) {
-				return reader.readLine();
-			}
-		} finally {
-			if (process != null) {
-				process.destroy();
-			}
-			if (errorThread != null) {
-				try {
-					errorThread.halt();
-				} catch (InterruptedException e) {
-					// Stop waiting and return anyway.
-				} finally {
-					errorThread = null;
-				}
-			}
-			if (session != null) {
-				SshSessionFactory.getInstance().releaseSession(session);
-			}
-		}
-	}
-
 	/**
 	 * @param operation
 	 *            the operation to perform, e.g. Protocol.OPERATION_DOWNLOAD