Migration

LauncherSource/launcher_shared/src/lib.rs

@@ -0,0 +1,23 @@
+use sha2::{Digest, Sha256};
+use std::{fs::File, io};
+
+pub fn file_hash(filename: &str) -> Result<String, std::io::Error> {
+    let mut file = File::open(filename)?;
+    let mut hasher = Sha256::new();
+    io::copy(&mut file, &mut hasher)?;
+    Ok(format!("{:x}", hasher.finalize()))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let hash = file_hash("Cargo.toml").unwrap();
+        assert_eq!(
+            hash,
+            "02272c4c973d0bf266b571bf596797f46602ae6796d33df4b4057a170483d8f8"
+        );
+    }
+}