1 files changed, 20 insertions, 0 deletions
diff --git a/src/initramfs.rs b/src/initramfs.rs
index a108b85..4ece24c 100644
--- a/src/initramfs.rs
+++ b/src/initramfs.rs
@@ -249,4 +249,24 @@ impl InitramfsResult {
     pub fn sha256(&self) -> &str {
         &self.sha256
     }
+
+    /// Ensure the initrd recorded by the platform adapter still exists in the
+    /// assembled rootfs and has not changed before native packaging begins.
+    pub fn verify_in_rootfs(&self, rootfs: &Path) -> Result<()> {
+        let contents = fs::read(rootfs.join(&self.initrd_path)).with_context(|| {
+            format!(
+                "read generated initrd {}",
+                rootfs.join(&self.initrd_path).display()
+            )
+        })?;
+        let digest = format!("{:x}", Sha256::digest(contents));
+        if digest != self.sha256 {
+            bail!(
+                "generated initrd digest changed for {}: expected {}, found {digest}",
+                self.initrd_path.display(),
+                self.sha256
+            );
+        }
+        Ok(())
+    }
 }