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The Git-Flow Maven Plugin supports various Git workflows, including Vincent Driessen's successful Git branching model and GitHub Flow. This plugin runs Git and Maven commands from the command line. Supports Eclipse Plugins build with Tycho.

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/*
 * Copyright 2014-2017 Aleksandr Mashchenko.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.amashchenko.maven.plugin.gitflow;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.shared.release.versions.VersionParseException;
import org.codehaus.plexus.components.interactivity.PrompterException;
import org.codehaus.plexus.util.StringUtils;
import org.codehaus.plexus.util.cli.CommandLineException;

/**
 * The git flow hotfix start mojo.
 * 
 */
@Mojo(name = "hotfix-start", aggregator = true)
public class GitFlowHotfixStartMojo extends AbstractGitFlowMojo {

    /**
     * Whether to push to the remote.
     * 
     * @since 1.6.0
     */
    @Parameter(property = "pushRemote", defaultValue = "false")
    private boolean pushRemote;

    /** {@inheritDoc} */
    @Override
    public void execute() throws MojoExecutionException, MojoFailureException {
        validateConfiguration();

        try {
            // set git flow configuration
            initGitFlowConfig();

            // check uncommitted changes
            checkUncommittedChanges();

            String branchName = gitFlowConfig.getProductionBranch();

            final String supportBranches = gitFindBranches(
                    gitFlowConfig.getSupportBranchPrefix(), false);

            if (StringUtils.isNotBlank(supportBranches)) {
                final String[] tmpBranches = supportBranches.split("\\r?\\n");

                String[] branches = new String[tmpBranches.length + 1];
                for (int i = 0; i < tmpBranches.length; i++) {
                    branches[i] = tmpBranches[i];
                }
                // add production branch to the list
                branches[tmpBranches.length] = gitFlowConfig
                        .getProductionBranch();

                List numberedList = new ArrayList();
                StringBuilder str = new StringBuilder("Branches:").append(LS);
                for (int i = 0; i < branches.length; i++) {
                    str.append((i + 1) + ". " + branches[i] + LS);
                    numberedList.add(String.valueOf(i + 1));
                }
                str.append("Choose branch to hotfix");

                String branchNumber = null;
                try {
                    while (StringUtils.isBlank(branchNumber)) {
                        branchNumber = prompter.prompt(str.toString(),
                                numberedList);
                    }
                } catch (PrompterException e) {
                    getLog().error(e);
                }

                if (branchNumber != null) {
                    int num = Integer.parseInt(branchNumber);
                    branchName = branches[num - 1];
                }

                if (StringUtils.isBlank(branchName)) {
                    throw new MojoFailureException("Branch name is blank.");
                }
            }
            //

            // need to be in master to get correct project version
            // git checkout master
            gitCheckout(branchName);

            // fetch and check remote
            if (fetchRemote) {
                gitFetchRemoteAndCompare(branchName);
            }

            // get current project version from pom
            final String currentVersion = getCurrentProjectVersion();

            // get default hotfix version
            final String defaultVersion = new GitFlowVersionInfo(currentVersion)
                    .hotfixVersion(tychoBuild);

            if (defaultVersion == null) {
                throw new MojoFailureException(
                        "Cannot get default project version.");
            }

            String version = null;
            try {
                while (version == null) {
                    version = prompter.prompt("What is the hotfix version? ["
                            + defaultVersion + "]");

                    if (!"".equals(version)
                            && (!GitFlowVersionInfo.isValidVersion(version) || !validBranchName(version))) {
                        getLog().info("The version is not valid.");
                        version = null;
                    }
                }
            } catch (PrompterException e) {
                getLog().error(e);
            }

            if (StringUtils.isBlank(version)) {
                version = defaultVersion;
            }

            // to finish hotfix on support branch
            String branchVersionPart = version.replace('/', '_');

            String hotfixBranchName = gitFlowConfig.getHotfixBranchPrefix()
                    + branchVersionPart;
            if (!gitFlowConfig.getProductionBranch().equals(branchName)) {
                hotfixBranchName = gitFlowConfig.getHotfixBranchPrefix()
                        + branchName + "/" + branchVersionPart;
            }

            // git for-each-ref refs/heads/hotfix/...
            final boolean hotfixBranchExists = gitCheckBranchExists(hotfixBranchName);

            if (hotfixBranchExists) {
                throw new MojoFailureException(
                        "Hotfix branch with that name already exists. Cannot start hotfix.");
            }

            // git checkout -b hotfix/... master
            gitCreateAndCheckout(hotfixBranchName, branchName);

            // execute if version changed
            if (!version.equals(currentVersion)) {
                // mvn versions:set -DnewVersion=... -DgenerateBackupPoms=false
                mvnSetVersions(version);

                Map properties = new HashMap();
                properties.put("version", version);

                // git commit -a -m updating versions for hotfix
                gitCommit(commitMessages.getHotfixStartMessage(), properties);
            }

            if (installProject) {
                // mvn clean install
                mvnCleanInstall();
            }

            if (pushRemote) {
                gitPush(hotfixBranchName, false);
            }
        } catch (CommandLineException e) {
            getLog().error(e);
        } catch (VersionParseException e) {
            getLog().error(e);
        }
    }
}




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