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Add check in ScpTo.java to prevent re-copy of up to date files #3

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Add check in ScpTo.java to prevent re-copy of up to date files #3

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83 changes: 74 additions & 9 deletions examples/ScpTo.java
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ public static void main(String[] arg){
if(arg.length!=2){
System.err.println("usage: java ScpTo file1 user@remotehost:file2");
System.exit(-1);
}
}

FileInputStream fis=null;
try{
Expand All @@ -28,6 +28,11 @@ public static void main(String[] arg){
session.setUserInfo(ui);
session.connect();

if(remoteIsEqual(session, lfile, rfile)) {
System.out.println("Files are equal, not performing SCP");
System.exit(0);
}

boolean ptimestamp = true;

// exec 'scp -t rfile' remotely
Expand All @@ -51,7 +56,7 @@ public static void main(String[] arg){
command="T "+(_lfile.lastModified()/1000)+" 0";
// The access time should be sent here,
// but it is not accessible with JavaAPI ;-<
command+=(" "+(_lfile.lastModified()/1000)+" 0\n");
command+=(" "+(_lfile.lastModified()/1000)+" 0\n");
out.write(command.getBytes()); out.flush();
if(checkAck(in)!=0){
System.exit(0);
Expand Down Expand Up @@ -132,22 +137,22 @@ public static class MyUserInfo implements UserInfo, UIKeyboardInteractive{
public String getPassword(){ return passwd; }
public boolean promptYesNo(String str){
Object[] options={ "yes", "no" };
int foo=JOptionPane.showOptionDialog(null,
int foo=JOptionPane.showOptionDialog(null,
str,
"Warning",
JOptionPane.DEFAULT_OPTION,
"Warning",
JOptionPane.DEFAULT_OPTION,
JOptionPane.WARNING_MESSAGE,
null, options, options[0]);
return foo==0;
}

String passwd;
JTextField passwordField=(JTextField)new JPasswordField(20);

public String getPassphrase(){ return null; }
public boolean promptPassphrase(String message){ return true; }
public boolean promptPassword(String message){
Object[] ob={passwordField};
Object[] ob={passwordField};
int result=
JOptionPane.showConfirmDialog(null, ob, message,
JOptionPane.OK_CANCEL_OPTION);
Expand All @@ -160,7 +165,7 @@ public boolean promptPassword(String message){
public void showMessage(String message){
JOptionPane.showMessageDialog(null, message);
}
final GridBagConstraints gbc =
final GridBagConstraints gbc =
new GridBagConstraints(0,0,1,1,1,1,
GridBagConstraints.NORTHWEST,
GridBagConstraints.NONE,
Expand Down Expand Up @@ -202,7 +207,7 @@ public String[] promptKeyboardInteractive(String destination,
gbc.gridy++;
}

if(JOptionPane.showConfirmDialog(null, panel,
if(JOptionPane.showConfirmDialog(null, panel,
destination+": "+name,
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.QUESTION_MESSAGE)
Expand All @@ -218,4 +223,64 @@ public String[] promptKeyboardInteractive(String destination,
}
}
}

private static boolean remoteIsEqual(Session session, String localPath, String remotePath) throws IOException {
boolean isEqual = false;

String rawString = remoteExecStdout(session, "date --utc --reference=" + remotePath + " +%s");
if(rawString == null) {
System.err.println("no existing remote file: "+ remotePath);
}
else {
long rMtime = Long.valueOf(rawString).longValue() * 1000;
long rSize = Long.valueOf(remoteExecStdout(session, "ls -l --full-time " + remotePath).split("\\s+")[4]).longValue();
File lFile = new File(localPath);

System.err.println("lFile size: " + lFile.length());
System.err.println("rFile size: " + rSize);
System.err.println("lFile mtime: " + lFile.lastModified());
System.err.println("rFile mtime: " + rMtime);

if(rMtime == lFile.lastModified() && rSize == lFile.length()) {
isEqual = true;
}
}

return isEqual;
}

private static String remoteExecStdout(Session session, String command) throws IOException {
int exitCode = -1;

Channel channel=session.openChannel("exec");
((ChannelExec)channel).setCommand(command);
System.err.println("Remote exection of command: [".concat(session.getHost()).concat("]: ").concat(command));
String fullOut = new String();

InputStream in=channel.getInputStream();
channel.connect();
byte[] tmp=new byte[1024];
while(true){
while(in.available()>0){
int i=in.read(tmp, 0, 1024);
if(i<0)break;
fullOut = fullOut.concat(new String(tmp, 0, i));
}
if(channel.isClosed()){
if(in.available()>0) continue;
exitCode = channel.getExitStatus();
break;
}
try{Thread.sleep(1000);}catch(Exception ee){}
}

channel.disconnect();
if(exitCode != 0) {
fullOut = null;
}
else {
fullOut = fullOut.trim();
}
return fullOut;
}
}