How do you set the configuration for jschconfigsessionfactory for jgit so that pull and push work?

Question

I am trying to do a git pull/push using jgit's api with the following code

org.eclipse.jgit.api.Git.open(theRepoFile).pull().call()

but I am getting exceptions

JSchException Auth fail
com.jcraft.jsch.Session.connect (Session.java:461)
org.eclipse.jgit.transport.JschConfigSessionFactory.getSession (JschConfigSessionFactory.java:116)
org.eclipse.jgit.transport.SshTransport.getSession (SshTransport.java:121)
org.eclipse.jgit.transport.TransportGitSsh$SshPushConnection.<init> (TransportGitSsh.java:306)
org.eclipse.jgit.transport.TransportGitSsh.openPush (TransportGitSsh.java:152)
org.eclipse.jgit.transport.PushProcess.execute (PushProcess.java:130)
org.eclipse.jgit.transport.Transport.push (Transport.java:1127)
org.eclipse.jgit.api.PushCommand.call (PushCommand.java:153)

Even though using cgit pull and pushing works.

I tried checking SO for example code

Java git client using jgit

but the above question does not provide a complete coded example of what is necessary to do a git pull with a remote repo that is normally authenticated via ssh keys. There should be a way to get the credential information from ~/.ssh/ or the windows equivalent.

Answer 1

Jsch will automatically detect your SSH keys but will fail if these are protected by a password. You need to specify the passphrase through a CredentialsProvider like this:

JschConfigSessionFactory sessionFactory = new JschConfigSessionFactory() {
@Override
protected void configure(OpenSshConfig.Host hc, Session session) {
    CredentialsProvider provider = new CredentialsProvider() {
        @Override
        public boolean isInteractive() {
            return false;
        }

        @Override
        public boolean supports(CredentialItem... items) {
            return true;
        }

        @Override
        public boolean get(URIish uri, CredentialItem... items) throws UnsupportedCredentialItem {
            for (CredentialItem item : items) {
                ((CredentialItem.StringType) item).setValue("yourpassphrase");
            }
            return true;
        }
    };
    UserInfo userInfo = new CredentialsProviderUserInfo(session, provider);
    session.setUserInfo(userInfo);
}
};
SshSessionFactory.setInstance(sessionFactory);