file_util: drop open file instance from PersistError

PersistError is basically a pair of io::Error and NamedTempFile instance. It's
unlikely that we would want to propagate the open file instance to the CLI
error handler, leaving the temporary file alive.

lib/src/file_util.rs

@@ -95,14 +95,14 @@ pub fn normalize_path(path: &Path) -> PathBuf {
 pub fn persist_content_addressed_temp_file<P: AsRef<Path>>(
     temp_file: NamedTempFile,
     new_path: P,
-) -> Result<File, PersistError> {
+) -> io::Result<File> {
     match temp_file.persist(&new_path) {
         Ok(file) => Ok(file),
-        Err(PersistError { error, file }) => {
+        Err(PersistError { error, file: _ }) => {
             if let Ok(existing_file) = File::open(new_path) {
                 Ok(existing_file)
             } else {
-                Err(PersistError { error, file })
+                Err(error)
             }
         }
     }

lib/src/simple_op_store.rs

@@ -21,7 +21,7 @@ use std::io::{ErrorKind, Write};
 use std::path::{Path, PathBuf};
 
 use prost::Message;
-use tempfile::{NamedTempFile, PersistError};
+use tempfile::NamedTempFile;
 use thiserror::Error;
 
 use crate::backend::{CommitId, MillisSinceEpoch, ObjectId, Timestamp};
@@ -34,12 +34,6 @@ use crate::op_store::{
 };
 use crate::{git, op_store};
 
-impl From<PersistError> for OpStoreError {
-    fn from(err: PersistError) -> Self {
-        OpStoreError::Other(err.into())
-    }
-}
-
 #[derive(Debug, Error)]
 #[error("Failed to read {kind} with ID {id}: {err}")]
 struct DecodeError {
@@ -119,7 +113,8 @@ impl OpStore for SimpleOpStore {
 
         let id = ViewId::new(blake2b_hash(view).to_vec());
 
-        persist_content_addressed_temp_file(temp_file, self.view_path(&id))?;
+        persist_content_addressed_temp_file(temp_file, self.view_path(&id))
+            .map_err(|err| io_to_write_error(err, "view"))?;
         Ok(id)
     }
 
@@ -148,7 +143,8 @@ impl OpStore for SimpleOpStore {
 
         let id = OperationId::new(blake2b_hash(operation).to_vec());
 
-        persist_content_addressed_temp_file(temp_file, self.operation_path(&id))?;
+        persist_content_addressed_temp_file(temp_file, self.operation_path(&id))
+            .map_err(|err| io_to_write_error(err, "operation"))?;
         Ok(id)
     }
 }

lib/src/stacked_table.rs

@@ -359,10 +359,7 @@ impl TableSegment for MutableTable {
 
 #[derive(Debug, Error)]
 #[error(transparent)]
-pub enum TableStoreError {
-    IoError(#[from] io::Error),
-    PersistError(#[from] tempfile::PersistError),
-}
+pub struct TableStoreError(#[from] pub io::Error);
 
 pub type TableStoreResult<T> = Result<T, TableStoreError>;