Conflicts can occur after pull or merging branches. I would like to solve the conflicts programatically, by comparing the two versions of the file which are conflicting.
I can do this by looking into the MergeResult.
But if my sofware is restarted, I no longer have access to the MergeResult.
The git.status() command is also listing the conflicting files. But how can I get the two versions of the conflicting file from the status command?
ChatGPT indicate a solution like this, but DirCacheEntry is empty and the method dirCache.getEntry(filePath, DirCacheEntry.STAGE_2) currently accepts only one parameter.
public class JGitConflictObjectIds {
public static void main(String[] args) throws IOException {
try (Repository repository = new FileRepositoryBuilder().setGitDir(new File("/path/to/repo/.git")).build()) {
Git git = new Git(repository);
Status status = git.status().call();
Set<String> conflictingFiles = status.getConflicting();
for (String filePath : conflictingFiles) {
DirCache dirCache = repository.readDirCache();
DirCacheEntry ourEntry = dirCache.getEntry(filePath, DirCacheEntry.STAGE_2);
DirCacheEntry theirEntry = dirCache.getEntry(filePath, DirCacheEntry.STAGE_3);
ObjectId ourId = ourEntry.getObjectId();
ObjectId theirId = theirEntry.getObjectId();
System.out.println("File: " + filePath);
System.out.println("Our version ObjectId: " + ourId.name());
System.out.println("Their version ObjectId: " + theirId.name());
String ourContent = readFileContent(repository, ourId, filePath);
String theirContent = readFileContent(repository, theirId, filePath);
System.out.println("Our version:\n" + ourContent);
System.out.println("Their version:\n" + theirContent);
}
}
}
private static String readFileContent(Repository repository, ObjectId commitId, String filePath) throws IOException {
try (RevWalk revWalk = new RevWalk(repository)) {
TreeWalk treeWalk = TreeWalk.forPath(repository, filePath, revWalk.parseCommit(commitId).getTree());
ObjectId blobId = treeWalk.getObjectId(0);
ObjectLoader loader = repository.open(blobId);
ByteArrayOutputStream out = new ByteArrayOutputStream();
loader.copyTo(out);
return out.toString();
}
}
}
}
Loading the file original text from MergeResult can be done using:
for (Map.Entry<String, int[][]> entry : mergeResult.getConflicts().entrySet()) {
String filePath = entry.getKey();
try {
String ourContent = readFileContent( repo.resolve("HEAD:" + filePath) );
String theirContent = readFileContent( repo.resolve("MERGE_HEAD:" + filePath) );
conflictVersions.put( filePath, new ConflictVersions(ourContent, theirContent) );
} catch ( Exception ex ){
Log.error( ex );
}
}
private String readFileContent(ObjectId objectId) throws IOException {
ObjectLoader loader = repo.open(objectId);
ByteArrayOutputStream out = new ByteArrayOutputStream();
loader.copyTo(out);
return out.toString( StandardCharsets.UTF_8 );
}
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