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comparison rust/hg-core/src/revlog/nodemap_docket.rs @ 46630:842f2372ced6

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rhg: Don?t attempt to read persistent nodemap without .hg/requires opt-in Differential Revision: https://phab.mercurial-scm.org/D10077
author Simon Sapin <simon.sapin@octobus.net>
date Thu, 25 Feb 2021 21:29:12 +0100
parents 43d63979a75e
children e834b79def74
comparison
equal deleted inserted replaced
46629:90481550467c 46630:842f2372ced6
1 use crate::errors::{HgError, HgResultExt}; 1 use crate::errors::{HgError, HgResultExt};
2 use crate::requirements;
2 use bytes_cast::{unaligned, BytesCast}; 3 use bytes_cast::{unaligned, BytesCast};
3 use memmap::Mmap; 4 use memmap::Mmap;
4 use std::path::{Path, PathBuf}; 5 use std::path::{Path, PathBuf};
5 6
6 use super::revlog::RevlogError; 7 use super::revlog::RevlogError;
36 /// can happen in a rare race condition). 37 /// can happen in a rare race condition).
37 pub fn read_from_file( 38 pub fn read_from_file(
38 repo: &Repo, 39 repo: &Repo,
39 index_path: &Path, 40 index_path: &Path,
40 ) -> Result<Option<(Self, Mmap)>, RevlogError> { 41 ) -> Result<Option<(Self, Mmap)>, RevlogError> {
42 if !repo
43 .requirements()
44 .contains(requirements::NODEMAP_REQUIREMENT)
45 {
46 // If .hg/requires does not opt it, don’t try to open a nodemap
47 return Ok(None);
48 }
49
41 let docket_path = index_path.with_extension("n"); 50 let docket_path = index_path.with_extension("n");
42 let docket_bytes = if let Some(bytes) = 51 let docket_bytes = if let Some(bytes) =
43 repo.store_vfs().read(&docket_path).io_not_found_as_none()? 52 repo.store_vfs().read(&docket_path).io_not_found_as_none()?
44 { 53 {
45 bytes 54 bytes
86 Ok(Some((docket, mmap))) 95 Ok(Some((docket, mmap)))
87 } else { 96 } else {
88 Err(HgError::corrupted("persistent nodemap too short").into()) 97 Err(HgError::corrupted("persistent nodemap too short").into())
89 } 98 }
90 } else { 99 } else {
100 // Even if .hg/requires opted in, some revlogs are deemed small
101 // enough to not need a persistent nodemap.
91 Ok(None) 102 Ok(None)
92 } 103 }
93 } 104 }
94 } 105 }
95 106