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 * CruiseControl, a Continuous Integration Toolkit
 * Copyright (c) 2007, ThoughtWorks, Inc.
 * 200 E. Randolph, 25th Floor
 * Chicago, IL 60601 USA
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package net.sourceforge.cruisecontrol.bootstrappers;

import net.sourceforge.cruisecontrol.Bootstrapper;
import net.sourceforge.cruisecontrol.CruiseControlException;
import net.sourceforge.cruisecontrol.util.Commandline;
import net.sourceforge.cruisecontrol.util.ValidationHelper;

import org.apache.log4j.Logger;

import java.io.File;

/**
 * The GitBootstrapper will handle updating a git repository before the build begins.
 *
 * @see <a href="http://git.or.cz/">git.or.cz</a>
 * @author <a href="rschiele@gmail.com">Robert Schiele</a>
 */
public class GitBootstrapper implements Bootstrapper {
    private static final Logger LOG = Logger.getLogger(GitBootstrapper.class);

    private String lwc;

    /**
     * Sets the local working copy to use when making calls to git.
     *
     * @param d
     *            String indicating the relative or absolute path to the local working copy of the git repository on
     *            which to execute the pull command.
     */
    public void setLocalWorkingCopy(String d) {
        lwc = d;
    }

    /**
     * This method validates that the local working copy location has been specified.
     *
     * @throws CruiseControlException
     *             Thrown when the local working copy location is null
     */
    public void validate() throws CruiseControlException {
        ValidationHelper.assertTrue(lwc != null, "'localWorkingCopy' is a required "
                + "attribute on the Git bootstrapper " + "task");

        final File wd = new File(lwc);
        ValidationHelper.assertTrue(wd.exists() && wd.isDirectory(), "'localWorkingCopy' must be an existing "
                + "directory. Was" + wd.getAbsolutePath());
    }

    /**
     * Update the git repository.
     *
     * @throws CruiseControlException
     */
    public void bootstrap() throws CruiseControlException {
        final Commandline cmd = new Commandline();
        cmd.setExecutable("git");
        cmd.setWorkingDirectory(lwc);
        cmd.createArgument("pull");

        cmd.executeAndWait(LOG);
    }
}