Make the network code use handles

This wasn't ported together with the rest, but it does exhibit the same
issues, so let's port it over now.

clone.go

@@ -28,18 +28,20 @@ func Clone(url string, path string, options *CloneOptions) (*Repository, error)
 	cpath := C.CString(path)
 	defer C.free(unsafe.Pointer(cpath))
 
-	var copts C.git_clone_options
+	copts := (*C.git_clone_options)(C.calloc(1, C.size_t(unsafe.Sizeof(C.git_clone_options{}))))
-	populateCloneOptions(&copts, options)
+	populateCloneOptions(copts, options)
-	defer freeCheckoutOpts(&copts.checkout_opts)
 
 	if len(options.CheckoutBranch) != 0 {
 		copts.checkout_branch = C.CString(options.CheckoutBranch)
-		defer C.free(unsafe.Pointer(copts.checkout_branch))
 	}
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
-	ret := C.git_clone(&repo.ptr, curl, cpath, &copts)
+	ret := C.git_clone(&repo.ptr, curl, cpath, copts)
+	freeCheckoutOpts(&copts.checkout_opts)
+	C.free(unsafe.Pointer(copts.checkout_branch))
+	C.free(unsafe.Pointer(copts))
+
 	if ret < 0 {
 		return nil, MakeGitError(ret)
 	}

remote.go

@@ -129,12 +129,12 @@ func populateRemoteCallbacks(ptr *C.git_remote_callbacks, callbacks *RemoteCallb
 		return
 	}
 	C._go_git_setup_callbacks(ptr)
-	ptr.payload = unsafe.Pointer(callbacks)
+	ptr.payload = pointerHandles.Track(callbacks)
 }
 
 //export sidebandProgressCallback
 func sidebandProgressCallback(_str *C.char, _len C.int, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks := pointerHandles.Get(data).(*RemoteCallbacks)
 	if callbacks.SidebandProgressCallback == nil {
 		return 0
 	}
@@ -144,7 +144,7 @@ func sidebandProgressCallback(_str *C.char, _len C.int, data unsafe.Pointer) int
 
 //export completionCallback
 func completionCallback(completion_type C.git_remote_completion_type, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks := pointerHandles.Get(data).(*RemoteCallbacks)
 	if callbacks.CompletionCallback == nil {
 		return 0
 	}
@@ -153,7 +153,7 @@ func completionCallback(completion_type C.git_remote_completion_type, data unsaf
 
 //export credentialsCallback
 func credentialsCallback(_cred **C.git_cred, _url *C.char, _username_from_url *C.char, allowed_types uint, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks, _ := pointerHandles.Get(data).(*RemoteCallbacks)
 	if callbacks.CredentialsCallback == nil {
 		return 0
 	}
@@ -166,7 +166,7 @@ func credentialsCallback(_cred **C.git_cred, _url *C.char, _username_from_url *C
 
 //export transferProgressCallback
 func transferProgressCallback(stats *C.git_transfer_progress, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks, _ := pointerHandles.Get(data).(*RemoteCallbacks)
 	if callbacks.TransferProgressCallback == nil {
 		return 0
 	}
@@ -175,7 +175,7 @@ func transferProgressCallback(stats *C.git_transfer_progress, data unsafe.Pointe
 
 //export updateTipsCallback
 func updateTipsCallback(_refname *C.char, _a *C.git_oid, _b *C.git_oid, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks, _ := pointerHandles.Get(data).(*RemoteCallbacks)
 	if callbacks.UpdateTipsCallback == nil {
 		return 0
 	}
@@ -187,7 +187,7 @@ func updateTipsCallback(_refname *C.char, _a *C.git_oid, _b *C.git_oid, data uns
 
 //export certificateCheckCallback
 func certificateCheckCallback(_cert *C.git_cert, _valid C.int, _host *C.char, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks, _ := pointerHandles.Get(data).(*RemoteCallbacks)
 	// if there's no callback set, we need to make sure we fail if the library didn't consider this cert valid
 	if callbacks.CertificateCheckCallback == nil {
 		if _valid == 1 {
@@ -228,7 +228,7 @@ func certificateCheckCallback(_cert *C.git_cert, _valid C.int, _host *C.char, da
 
 //export packProgressCallback
 func packProgressCallback(stage C.int, current, total C.uint, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks, _ := pointerHandles.Get(data).(*RemoteCallbacks)
 
 	if callbacks.PackProgressCallback == nil {
 		return 0
@@ -239,7 +239,7 @@ func packProgressCallback(stage C.int, current, total C.uint, data unsafe.Pointe
 
 //export pushTransferProgressCallback
 func pushTransferProgressCallback(current, total C.uint, bytes C.size_t, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks, _ := pointerHandles.Get(data).(*RemoteCallbacks)
 	if callbacks.PushTransferProgressCallback == nil {
 		return 0
 	}
@@ -249,7 +249,7 @@ func pushTransferProgressCallback(current, total C.uint, bytes C.size_t, data un
 
 //export pushUpdateReferenceCallback
 func pushUpdateReferenceCallback(refname, status *C.char, data unsafe.Pointer) int {
-	callbacks := (*RemoteCallbacks)(data)
+	callbacks, _ := pointerHandles.Get(data).(*RemoteCallbacks)
 
 	if callbacks.PushUpdateReferenceCallback == nil {
 		return 0
@@ -286,6 +286,12 @@ func (r *Remote) SetCallbacks(callbacks *RemoteCallbacks) error {
 
 func (r *Remote) Free() {
 	runtime.SetFinalizer(r, nil)
+
+	callbacks := C.git_remote_get_callbacks(r.ptr)
+	if callbacks != nil && callbacks.payload != nil {
+		pointerHandles.Untrack(callbacks.payload)
+	}
+
 	C.git_remote_free(r.ptr)
 }