Getting older version file contents with ngit

Question

Basically I need to get older version of a file in the repository without changing the current working file. I thought of different ways:

Temporary branch and do the thing
Copy the file, checkout the file do my thing and return it

But those ways are really slow and complex. Isn't there something simpler than that in ngit?

Does it have to be ngit? `git show :path/to/file > file.old-version` (or I suppose maybe ngit has a git-show analog?) — Cascabel, Feb 21 '12 at 17:50
[git-cat-file](http://schacon.github.com/git/git-cat-file.html) is also a choice. [git show answered here](http://stackoverflow.com/questions/610208/how-to-retrieve-a-single-file-from-specific-revision-in-git) fully — Lazy Badger, Feb 21 '12 at 18:48
thanks guys, but our product is using already ngit and it will be quite an effort to change everything. Well, I can try and wrap the console for this sole reason, but I am still hoping for a ngit solution :) — Ilian Iliev, Feb 21 '12 at 19:13

score 0 · Accepted Answer · answered Jul 05 '12 at 09:47

Using NGit: for details of the method usage, please see jgit documentation http://jgit.info/javadoc/

ObjectId commitId = git.GetRepository().Resolve(ref);
RevWalk revWalk = new RevWalk(git.GetRepository());
RevTree revTree = loRevWalk.ParseTree(commitId);
TreeWalk treeWalk = new TreeWalk(git.GetRepository());
treeWalk.AddTree(revTree);

while (treeWalk.Next())
{
    //compare treeWalk.NameString yourself
    byte[] bytes = treeWalk.ObjectReader.Open(treeWalk.GetObjectId(0)).GetCachedBytes()
    ...
}

Getting older version file contents with ngit

1 Answers1