Mercurial > public > mercurial-scm > hg
diff rust/hg-core/src/dirstate_tree/dispatch.rs @ 47678:065e61628980
dirstate-v2: Support appending to the same data file
For now we?re still writing the entire data every time, so appending is not
useful yet. Later we?ll have new nodes pointing to some existing data for
nodes and paths that haven?t changed.
The decision whether to append is pseudo-random in order to make tests exercise
both code paths. This will be replaced by a heuristic based on the amount
of unused existing data.
Differential Revision: https://phab.mercurial-scm.org/D11094
| author | Simon Sapin <simon.sapin@octobus.net> |
|---|---|
| date | Tue, 13 Jul 2021 17:18:23 +0200 |
| parents | ff97e793ed36 |
| children | 78f7f0d490ee |
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--- a/rust/hg-core/src/dirstate_tree/dispatch.rs Tue Jul 13 09:44:44 2021 +0200 +++ b/rust/hg-core/src/dirstate_tree/dispatch.rs Tue Jul 13 17:18:23 2021 +0200 @@ -179,11 +179,19 @@ /// Clear mtimes that are ambigous with `now` (similar to /// `clear_ambiguous_times` but for all files in the dirstate map), and - /// serialize bytes to write the `.hg/dirstate` file to disk in dirstate-v2 + /// serialize bytes to write a dirstate data file to disk in dirstate-v2 /// format. /// + /// Returns new data together with whether that data should be appended to + /// the existing data file whose content is at `self.on_disk` (true), + /// instead of written to a new data file (false). + /// /// Note: this is only supported by the tree dirstate map. - fn pack_v2(&mut self, now: Timestamp) -> Result<Vec<u8>, DirstateError>; + fn pack_v2( + &mut self, + now: Timestamp, + can_append: bool, + ) -> Result<(Vec<u8>, bool), DirstateError>; /// Run the status algorithm. /// @@ -383,7 +391,11 @@ self.pack(parents, now) } - fn pack_v2(&mut self, _now: Timestamp) -> Result<Vec<u8>, DirstateError> { + fn pack_v2( + &mut self, + _now: Timestamp, + _can_append: bool, + ) -> Result<(Vec<u8>, bool), DirstateError> { panic!( "should have used dirstate_tree::DirstateMap to use the v2 format" )