upstream/mercurial-mirror Files · rust/hg-core/src/operations/debugdata.rs

persistent-nodemap: introduce a test to highlight possible race...

persistent-nodemap: introduce a test to highlight possible race Weakness in the current file caching of the changelog means that a writer can end up using an outdated docket. This might result in "committed" persistent-nodemap data from a previous writer to be overwritten by a later writer. This break the strong "append only" assumption of the persistent nodemap and can result in confused reader. The race windows are quite narrow. See the test documentation for details. The issues is fixed in the next changeset. Differential Revision: https://phab.mercurial-scm.org/D11481

Simon Sapin - - Load All Authors

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                r48852:52018f8e

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             debugdata.rs
        
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      // debugdata.rs

      //

      // Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>

      //

      // This software may be used and distributed according to the terms of the

      // GNU General Public License version 2 or any later version.

      use crate::repo::Repo;

      use crate::revlog::revlog::{Revlog, RevlogError};

      /// Kind of data to debug

      #[derive(Debug, Copy, Clone)]

      pub enum DebugDataKind {

          Changelog,

          Manifest,

      }

      /// Dump the contents data of a revision.

      pub fn debug_data(

          repo: &Repo,

          revset: &str,

          kind: DebugDataKind,

      ) -> Result<Vec<u8>, RevlogError> {

          let index_file = match kind {

              DebugDataKind::Changelog => "00changelog.i",

              DebugDataKind::Manifest => "00manifest.i",

          };

          let revlog = Revlog::open(repo, index_file, None)?;

          let rev =

              crate::revset::resolve_rev_number_or_hex_prefix(revset, &revlog)?;

          let data = revlog.get_rev_data(rev)?;

          Ok(data)

      }

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				// debugdata.rs
				//
				// Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>
				//
				// This software may be used and distributed according to the terms of the
				// GNU General Public License version 2 or any later version.

				use crate::repo::Repo;
				use crate::revlog::revlog::{Revlog, RevlogError};

				/// Kind of data to debug
				#[derive(Debug, Copy, Clone)]
				pub enum DebugDataKind {
				Changelog,
				Manifest,
				}

				/// Dump the contents data of a revision.
				pub fn debug_data(
				repo: &Repo,
				revset: &str,
				kind: DebugDataKind,
				) -> Result<Vec<u8>, RevlogError> {
				let index_file = match kind {
				DebugDataKind::Changelog => "00changelog.i",
				DebugDataKind::Manifest => "00manifest.i",
				};
				let revlog = Revlog::open(repo, index_file, None)?;
				let rev =
				crate::revset::resolve_rev_number_or_hex_prefix(revset, &revlog)?;
				let data = revlog.get_rev_data(rev)?;
				Ok(data)
				}