diff rust/hg-core/src/dirstate_tree/on_disk.rs @ 50221:1891086f6c7f stable

dirstate: use more than a bool to control append behavior

When writing dirstate-v2, we might either append to the existing file, or
create a new file.

We are about to introduce some configuration to control this behavior.
As a prelude, we change the current way the behavior was automatically
controlled to make the change smaller/clearer.

--- a/rust/hg-core/src/dirstate_tree/on_disk.rs	Fri Feb 24 01:15:45 2023 +0100
+++ b/rust/hg-core/src/dirstate_tree/on_disk.rs	Fri Feb 24 18:21:54 2023 +0100
@@ -4,7 +4,9 @@
 
 use crate::dirstate::{DirstateV2Data, TruncatedTimestamp};
 use crate::dirstate_tree::dirstate_map::DirstateVersion;
-use crate::dirstate_tree::dirstate_map::{self, DirstateMap, NodeRef};
+use crate::dirstate_tree::dirstate_map::{
+    self, DirstateMap, DirstateMapWriteMode, NodeRef,
+};
 use crate::dirstate_tree::path_with_basename::WithBasename;
 use crate::errors::HgError;
 use crate::utils::hg_path::HgPath;
@@ -634,9 +636,12 @@
 /// (false), and the previous size of data on disk.
 pub(super) fn write(
     dirstate_map: &DirstateMap,
-    can_append: bool,
+    write_mode: DirstateMapWriteMode,
 ) -> Result<(Vec<u8>, TreeMetadata, bool, usize), DirstateError> {
-    let append = can_append && dirstate_map.write_should_append();
+    let append = match write_mode {
+        DirstateMapWriteMode::Auto => dirstate_map.write_should_append(),
+        DirstateMapWriteMode::ForceNewDataFile => false,
+    };
     if append {
         log::trace!("appending to the dirstate data file");
     } else {