libsnapshot: Wait for COW path



After mapping COW device, wait for the device to appear
before initializing it.

Bug: 305829996
Test: OTA on Pixel
Change-Id: If9e0e1ce684aa15bc9f3fd5a01e4f0421de87e81
Signed-off-by: Akilesh Kailash <akailash@google.com>

parent dfe80e48

fs_mgr/libsnapshot/snapshot.cpp

+5 −0

Original line number	Diff line number	Diff line
		@@ -3513,6 +3513,11 @@ Return SnapshotManager::InitializeUpdateSnapshots(
		return Return::Error();
		}

		if (!android::fs_mgr::WaitForFile(cow_path, 6s)) {
		LOG(ERROR) << "Timed out waiting for device to appear: " << cow_path;
		return Return::Error();
		}

		if (it->second.using_snapuserd()) {
		unique_fd fd(open(cow_path.c_str(), O_RDWR \| O_CLOEXEC));
		if (fd < 0) {