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import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import org.apache.tools.ant.Project;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.storage.file.FileRepositoryBuilder;
public class GitRevTask extends org.apache.tools.ant.Task {
private String repoPath;
private String branchprop;
private String revprop;
private String dateprop;
public void setRepoPath(final String repoPath) {
this.repoPath = repoPath;
}
public void setBranchprop(final String branchprop) {
this.branchprop = branchprop;
}
public void setRevprop(final String revprop) {
this.revprop = revprop;
}
public void setDateprop(final String dateprop) {
this.dateprop = dateprop;
}
public void execute() {
if (this.revprop==null || this.revprop.isEmpty()) {
log("git entries file name revprop was not set properly",Project.MSG_ERR);
return;
}
if (this.dateprop==null || this.dateprop.isEmpty()) {
log("git entries file name dateprop was not set properly",Project.MSG_ERR);
return;
}
String branch = null;
String revision = null;
String lastTag = null;
String commitDate = null;
Repository repo = null;
Git git = null;
RevWalk walk = null;
try {
final File src = new File(repoPath);
repo = new FileRepositoryBuilder().readEnvironment()
.findGitDir(src).build();
branch = repo.getBranch();
branch = "master".equals(branch)? "" : "_" + branch;
final ObjectId head = repo.resolve("HEAD");
git = new Git(repo);
final List<Ref> tags = git.tagList().call();
walk = new RevWalk(repo);
final RevCommit headCommit = walk.parseCommit(head);
final SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
commitDate = df.format(headCommit.getAuthorIdent().getWhen());
walk.markStart(headCommit);
int distance = 0;
/* Peel known tags */
final List<Ref> peeledTags = new ArrayList<>();
for(final Ref tag : tags) {
peeledTags.add(repo.peel(tag));
}
/* Look for the last tag commit and calculate distance with the HEAD commit */
for (final RevCommit commit : walk) {
for (final Ref tag : peeledTags) {
if (commit.equals(tag.getPeeledObjectId()) || commit.equals(tag.getObjectId())) {
lastTag = commit.getShortMessage();
break;
}
}
if (lastTag != null || distance++ > 90999) {
break;
}
}
walk.dispose();
if (lastTag == null) {
revision = "0000";
} else {
revision = Integer.toString(distance + 9000);
}
} catch (final IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (GitAPIException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
/* In all cases, properly release resources */
if(walk != null) {
walk.close();
}
if(git != null) {
git.close();
}
if(repo != null) {
repo.close();
}
}
Project theProject = getProject();
if (theProject != null) {
theProject.setProperty(this.branchprop, branch);
log("Property '" + this.branchprop + "' set to '" + branch + "'", Project.MSG_VERBOSE);
theProject.setProperty(this.revprop, revision);
log("Property '" + this.revprop + "' set to '" + revision + "'", Project.MSG_VERBOSE);
theProject.setProperty(this.dateprop, commitDate);
log("Property '" + this.dateprop + "' set to '" + commitDate + "'", Project.MSG_VERBOSE);
}
}
/** use: GitRevTask.jar pathtoGitRepro outputfile
* optional parameter
* 1st parameter = path to Git repository (default ..)
* 2nd parameter = ouputfile (default gitbuild.properties)
* */
public static void main(String[] args) {
GitRevTask gitRevTask = new GitRevTask();
if (args.length == 0) {
gitRevTask.setRepoPath(".."); // path to root of git repository
} else {
gitRevTask.setRepoPath(args[0]);
}
gitRevTask.setBranchprop("branch");
gitRevTask.setRevprop("baseRevisionNr");
gitRevTask.setDateprop("DSTAMP");
Project p = new Project();
gitRevTask.setProject(p);
gitRevTask.execute();
String branch = gitRevTask.getProject().getProperty("branch");
String version = gitRevTask.getProject().getProperty("baseRevisionNr");
String commitDate = gitRevTask.getProject().getProperty("DSTAMP");
File f;
if (args.length > 1) {
f = new File (args[1]);
} else {
f = new File("gitbuildnumber.properties");
}
try {
f.createNewFile();
FileWriter w = new FileWriter(f);
w.append("branch=" + branch + "\n");
w.append("releaseNr=" + version + "\n");
w.append("DSTAMP=" + commitDate + "\n");
w.close();
} catch (final IOException ex) {}
}
}
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