--- a/rust/hg-core/src/revlog/node.rs	Wed Jan 27 14:59:09 2021 +0100
+++ b/rust/hg-core/src/revlog/node.rs	Wed Jan 27 14:45:25 2021 +0100
@@ -8,6 +8,7 @@
 //! In Mercurial code base, it is customary to call "a node" the binary SHA
 //! of a revision.
 
+use crate::errors::HgError;
 use bytes_cast::BytesCast;
 use std::convert::{TryFrom, TryInto};
 use std::fmt;
@@ -136,6 +137,19 @@
         }
     }
 
+    /// `from_hex`, but for input from an internal file of the repository such
+    /// as a changelog or manifest entry.
+    ///
+    /// An error is treated as repository corruption.
+    pub fn from_hex_for_repo(hex: impl AsRef<[u8]>) -> Result<Node, HgError> {
+        Self::from_hex(hex.as_ref()).map_err(|FromHexError| {
+            HgError::CorruptedRepository(format!(
+                "Expected a full hexadecimal node ID, found {}",
+                String::from_utf8_lossy(hex.as_ref())
+            ))
+        })
+    }
+
     /// Provide access to binary data
     ///
     /// This is needed by FFI layers, for instance to return expected