migrate to rust

src/blockdev.rs

@@ -0,0 +1,21 @@
+use tokio::fs;
+use tokio::io::{AsyncReadExt, AsyncWriteExt, Result};
+
+/// Checks if a block device is uninitialized.
+/// It assumed that a initialized device always has a non-zero byte in the first 8kiB.
+pub async fn is_uninitialized(dev_path: &str) -> Result<bool> {
+    let mut dev = fs::File::open(dev_path).await?;
+
+    let mut buf = [0u8; 8 << 10];
+    dev.read_exact(&mut buf).await?;
+
+    Ok(buf.into_iter().all(|b| b == 0))
+}
+
+/// zeroes the first 8kiB of the device so it looks uninitialized again.
+pub async fn uninitialize(dev_path: &str) -> Result<()> {
+    let mut dev = fs::File::options().write(true).open(dev_path).await?;
+
+    let buf = [0u8; 8 << 10];
+    dev.write_all(&buf).await
+}