author | Simon Sapin <simon.sapin@octobus.net> |
Fri, 10 Sep 2021 09:53:09 +0200 | |
changeset 47955 | e834b79def74 |
parent 46630 | 842f2372ced6 |
child 47963 | 001d747c2baf |
permissions | -rw-r--r-- |
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use crate::errors::{HgError, HgResultExt}; |
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use crate::requirements; |
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use bytes_cast::{unaligned, BytesCast}; |
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use memmap2::Mmap; |
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use std::path::{Path, PathBuf}; |
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use super::revlog::RevlogError; |
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use crate::repo::Repo; |
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use crate::utils::strip_suffix; |
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const ONDISK_VERSION: u8 = 1; |
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pub(super) struct NodeMapDocket { |
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pub data_length: usize, |
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// TODO: keep here more of the data from `parse()` when we need it |
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} |
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#[derive(BytesCast)] |
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#[repr(C)] |
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struct DocketHeader { |
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uid_size: u8, |
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_tip_rev: unaligned::U64Be, |
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data_length: unaligned::U64Be, |
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_data_unused: unaligned::U64Be, |
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tip_node_size: unaligned::U64Be, |
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} |
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impl NodeMapDocket { |
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/// Return `Ok(None)` when the caller should proceed without a persistent |
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/// nodemap: |
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/// |
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/// * This revlog does not have a `.n` docket file (it is not generated for |
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/// small revlogs), or |
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/// * The docket has an unsupported version number (repositories created by |
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/// later hg, maybe that should be a requirement instead?), or |
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/// * The docket file points to a missing (likely deleted) data file (this |
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/// can happen in a rare race condition). |
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pub fn read_from_file( |
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repo: &Repo, |
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index_path: &Path, |
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) -> Result<Option<(Self, Mmap)>, RevlogError> { |
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if !repo |
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.requirements() |
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.contains(requirements::NODEMAP_REQUIREMENT) |
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{ |
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// If .hg/requires does not opt it, don’t try to open a nodemap |
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return Ok(None); |
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} |
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let docket_path = index_path.with_extension("n"); |
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let docket_bytes = if let Some(bytes) = |
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repo.store_vfs().read(&docket_path).io_not_found_as_none()? |
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{ |
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bytes |
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} else { |
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return Ok(None); |
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}; |
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|
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let input = if let Some((&ONDISK_VERSION, rest)) = |
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docket_bytes.split_first() |
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{ |
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rest |
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} else { |
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return Ok(None); |
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}; |
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|
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/// Treat any error as a parse error |
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fn parse<T, E>(result: Result<T, E>) -> Result<T, RevlogError> { |
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result.map_err(|_| { |
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HgError::corrupted("nodemap docket parse error").into() |
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}) |
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} |
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|
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let (header, rest) = parse(DocketHeader::from_bytes(input))?; |
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let uid_size = header.uid_size as usize; |
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// TODO: do we care about overflow for 4 GB+ nodemap files on 32-bit |
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// systems? |
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let tip_node_size = header.tip_node_size.get() as usize; |
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let data_length = header.data_length.get() as usize; |
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let (uid, rest) = parse(u8::slice_from_bytes(rest, uid_size))?; |
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let (_tip_node, _rest) = |
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parse(u8::slice_from_bytes(rest, tip_node_size))?; |
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let uid = parse(std::str::from_utf8(uid))?; |
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let docket = NodeMapDocket { data_length }; |
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let data_path = rawdata_path(&docket_path, uid); |
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// TODO: use `vfs.read()` here when the `persistent-nodemap.mmap` |
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// config is false? |
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if let Some(mmap) = repo |
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.store_vfs() |
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.mmap_open(&data_path) |
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.io_not_found_as_none()? |
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{ |
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if mmap.len() >= data_length { |
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Ok(Some((docket, mmap))) |
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} else { |
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Err(HgError::corrupted("persistent nodemap too short").into()) |
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} |
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} else { |
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// Even if .hg/requires opted in, some revlogs are deemed small |
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// enough to not need a persistent nodemap. |
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Ok(None) |
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} |
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} |
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} |
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107 |
fn rawdata_path(docket_path: &Path, uid: &str) -> PathBuf { |
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108 |
let docket_name = docket_path |
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109 |
.file_name() |
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110 |
.expect("expected a base name") |
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111 |
.to_str() |
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112 |
.expect("expected an ASCII file name in the store"); |
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113 |
let prefix = strip_suffix(docket_name, ".n.a") |
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114 |
.or_else(|| strip_suffix(docket_name, ".n")) |
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parents:
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115 |
.expect("expected docket path in .n or .n.a"); |
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parents:
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116 |
let name = format!("{}-{}.nd", prefix, uid); |
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parents:
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117 |
docket_path |
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118 |
.parent() |
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119 |
.expect("expected a non-root path") |
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120 |
.join(name) |
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121 |
} |