Reputation: 35
I am trying to download a single file(myFile.xml) from a remote git branch without cloning all the repository, i found this code but it doesent work the error is in getCO;ponent function exctly in RevCommit commit = revWalk.parseCommit(lastCommitId);
public void getComponent() throws IOException
{
File repoDir = new File("https://**.git");
// open the repository
Repository repository = new FileRepository(repoDir);
// find the HEAD
ObjectId lastCommitId = repository.resolve("47100a898d1c76558e49d3f292b8e7a6d052fe51");
System.out.println("lastcommit to string "+lastCommitId.toString());
// now we have to get the commit
RevWalk revWalk = new RevWalk(repository);
RevCommit commit = revWalk.parseCommit(lastCommitId);
// and using commit's tree find the path
RevTree tree = commit.getTree();
TreeWalk treeWalk = new TreeWalk(repository);
treeWalk.addTree(tree);
treeWalk.setRecursive(true);
treeWalk.setFilter(PathFilter.create("abcd/myFile.xml"));
if (!treeWalk.next()) {
throw new IllegalStateException("Unable to download file.");
}
ObjectId objectId = treeWalk.getObjectId(0);
ObjectLoader loader = repository.open(objectId);
// and then one can use either
InputStream in = loader.openStream();
// or
loader.copyTo(System.out);
}
Exception in thread "main" org.eclipse.jgit.errors.MissingObjectException: Missing unknown 47100a898d1c76558e49d3f292b8e7a6d052fe51
at org.eclipse.jgit.internal.storage.file.WindowCursor.open(WindowCursor.java:168)
at org.eclipse.jgit.lib.ObjectReader.open(ObjectReader.java:236)
at org.eclipse.jgit.revwalk.RevWalk.parseAny(RevWalk.java:890)
at org.eclipse.jgit.revwalk.RevWalk.parseCommit(RevWalk.java:800)
at testGit.Authenticate.getComponent(Authenticate.java:138)
at testGit.Authenticate.main(Authenticate.java:90)
Upvotes: 2
Views: 2220
Reputation: 15872
Git protocols do not allow to do this directly, access to remote repositories is limited by design. One option with JGit would be to clone the repository in-memory only via InMemoryRepository, however this is probably only useful for smaller repositories as it might use up lots of memory otherwise.
See also the full snippet in the jgit-cookbook
Upvotes: 1