fix: handle canonicalizing dead path

If the receipt points to a path that no longer exists, the call to
canonicalize will blow up. In that case, we can fall back to the
original path as listed in the receipt for safety.

axoupdater/src/lib.rs

@@ -365,7 +365,16 @@ impl AxoUpdater {
     /// Returns a normalized version of install_prefix_root, for comparison
     fn install_prefix_root_normalized(&self) -> AxoupdateResult<Utf8PathBuf> {
         let raw_root = self.install_prefix_root()?;
-        let normalized = Utf8PathBuf::from_path_buf(raw_root.canonicalize()?)
+        // The canonicalize path could fail if the path doesn't exist anymore;
+        // catch that specific error here and return the original path.
+        // (We want to leave the UTF8 conversion to the next step so we handle
+        // those errors separately.)
+        let canonicalized = if let Ok(path) = raw_root.canonicalize() {
+            path
+        } else {
+            raw_root.into_std_path_buf()
+        };
+        let normalized = Utf8PathBuf::from_path_buf(canonicalized)
             .map_err(|path| AxoupdateError::CaminoConversionFailed { path })?;
         Ok(normalized)
     }