WIP: ( feat: create function to allow setting commit_create_cb while rebasing )

[Pranav2612000]

Fixes #850

[Pranav2612000]

I'll make the pipelines pass but I just wanted to get an early review on the approach.
Do you think this could work? The commit_create_cb_op expects a callback fn which has arguments slightly different from the one expected by raw.commit_create_cb ( e.g Oid instead of *mut git_oid, Signature instead of *const git_signature ) but the rust typechecker did not throw an error.

[CouleeApps]

Just throwing my opinion on here since I was tagged on the issue: I don't think that transmute is safe (the rust parameter types probably don't map cleanly to c ffi). I would use something like this: (example from my job) https://github.com/Vector35/binaryninja-api/blob/dev/rust/src/debuginfo.rs#L181-L246 where Rust puts all of its information into a Box type provided to the userdata (void*) parameter of the callback, and a static callback function which takes the boxed data and interprets it properly.

[ehuss]

remote_callbacks.rs has some examples for handling callbacks (using an extern "C" callback with a void * payload for the function pointer). That might provide some inspiration.

[Pranav2612000]

Thank you for the help @CouleeApps @ehuss
I'll take a look at the code you shared and take another stab at it soon

[Pranav2612000]

@ehuss I've followed an approach similar to the one used in remote_callback.rs. Can you take a look again?

[Pranav2612000]

Also, I'm testing the changes through an application I have and passing GITPASSTHROUGH works as expected, but passing other values, which should result in the stopping and returning a failure crashes the app. The error is inside rebase.commit func. Here's a sample code I'm using

                if let Ok(commit_id) = rebase.commit(None, &committer.clone().into(), None) {
                    last_rebase_head = commit_id.into();
                } else {
                    rebase_success = false;
                    break;
                }

I've added print statements and ensured that it doesn't reach the else block before crashing.

Do you know what may be happening?

[Pranav2612000]

Bumping this up