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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 java.util.Properties;
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 GitComInf extends Properties {
final private String BRANCHPROP_LABEL = "branch";
final private String REVPROP_LABEL = "releaseNr"; // git commit number
final private String DATEPROP_LABEL = "DSTAMP"; // git commit date
private String repoPath; // path to repository root directory
public void setRepoPath(final String repoPath) {
this.repoPath = repoPath;
}
public void execute() {
String branch = null;
String revision = null;
String commitDate = null;
Repository repo = null;
Git git = null;
RevWalk walk = null;
Ref lastTag = null;
try {
final File src = new File(this.repoPath);
repo = new FileRepositoryBuilder().readEnvironment()
.findGitDir(src).build();
branch = repo.getBranch();
branch = "master".equals(branch) ? "" : "_" + branch;
this.setProperty(this.BRANCHPROP_LABEL, 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) {
lastTag = tag;
}
/* Look for the last tag commit and calculate distance with the HEAD commit */
for (final RevCommit commit : walk) {
if (commit.equals(lastTag.getPeeledObjectId()) || commit.equals(lastTag.getObjectId())) {
break;
}
if (distance++ > 90999) {
break;
}
}
walk.dispose();
if (lastTag == null) {
revision = "0000";
} else {
revision = Integer.toString(distance + 9000);
}
this.setProperty(this.BRANCHPROP_LABEL, branch);
this.setProperty(this.REVPROP_LABEL, revision);
this.setProperty("REPL_REVISION_NR", revision);
this.setProperty(this.DATEPROP_LABEL, commitDate);
this.setProperty("REPL_DATE", commitDate);
} catch (final IOException e) {
System.err.println(e.getMessage());
} catch (GitAPIException e) {
System.err.println(e.getMessage());
} catch (IllegalArgumentException e) {
System.err.println(e.getMessage());
} finally {
/* In all cases, properly release resources */
if (walk != null) {
walk.close();
}
if (git != null) {
git.close();
}
if (repo != null) {
repo.close();
}
}
}
/**
* use: GitComInf.jar pathtoGitRepro outputfile gitbuildnumber.properties
*
* @param args = [0] path to Git repository (default . )
* [1] (optional) = filename for result (default ./gitbuildnumber.properties)
*/
public static void main(String[] args) {
GitComInf gitRevTask = new GitComInf();
if (args.length == 0) {
gitRevTask.setRepoPath("."); // path to root of git repository
} else {
gitRevTask.setRepoPath(args[0]);
}
gitRevTask.execute();
if (gitRevTask.isEmpty()) {
System.err.println("no Git repository found" + (args.length == 0 ? " in " + System.getProperty("user.dir") : " in " + args[0]));
} else {
System.out.println("Git Commit Info: " + gitRevTask.toString());
// output result to property file
File f;
if (args.length > 1) {
f = new File(args[1]);
if (!f.exists()) {
f.getParentFile().mkdirs(); // just make sure missing dir is not a problem
}
} else {
f = new File("gitbuildnumber.properties");
}
try {
f.createNewFile();
FileWriter w = new FileWriter(f);
gitRevTask.store(w, "");
w.close();
} catch (final IOException ex) {
System.out.println(ex.toString());
System.out.println(args[1]);
}
}
}
}
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