##// END OF EJS Templates
revlog: update data file record before index rename...
revlog: update data file record before index rename When migrating from inline to non-inline data storage, the data file is recorded initially as zero sized so that it is removed on failure. But the record has to be updated before the index is renamed, otherwise data is lost on rollback. Differential Revision: https://phab.mercurial-scm.org/D10725

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revlog.rs
71 lines | 2.2 KiB | application/rls-services+xml | RustLexer
// Copyright 2018-2020 Georges Racinet <georges.racinet@octobus.net>
// and Mercurial contributors
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.
//! Mercurial concepts for handling revision history
pub mod node;
pub mod nodemap;
mod nodemap_docket;
pub mod path_encode;
pub use node::{FromHexError, Node, NodePrefix};
pub mod changelog;
pub mod index;
pub mod manifest;
pub mod patch;
pub mod revlog;
/// Mercurial revision numbers
///
/// As noted in revlog.c, revision numbers are actually encoded in
/// 4 bytes, and are liberally converted to ints, whence the i32
pub type Revision = i32;
/// Marker expressing the absence of a parent
///
/// Independently of the actual representation, `NULL_REVISION` is guaranteed
/// to be smaller than all existing revisions.
pub const NULL_REVISION: Revision = -1;
/// Same as `mercurial.node.wdirrev`
///
/// This is also equal to `i32::max_value()`, but it's better to spell
/// it out explicitely, same as in `mercurial.node`
#[allow(clippy::unreadable_literal)]
pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff;
pub const WORKING_DIRECTORY_HEX: &str =
"ffffffffffffffffffffffffffffffffffffffff";
/// The simplest expression of what we need of Mercurial DAGs.
pub trait Graph {
/// Return the two parents of the given `Revision`.
///
/// Each of the parents can be independently `NULL_REVISION`
fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>;
}
#[derive(Clone, Debug, PartialEq)]
pub enum GraphError {
ParentOutOfRange(Revision),
WorkingDirectoryUnsupported,
}
/// The Mercurial Revlog Index
///
/// This is currently limited to the minimal interface that is needed for
/// the [`nodemap`](nodemap/index.html) module
pub trait RevlogIndex {
/// Total number of Revisions referenced in this index
fn len(&self) -> usize;
fn is_empty(&self) -> bool {
self.len() == 0
}
/// Return a reference to the Node or `None` if rev is out of bounds
///
/// `NULL_REVISION` is not considered to be out of bounds.
fn node(&self, rev: Revision) -> Option<&Node>;
}