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annotate rust/hg-core/src/operations/cat.rs @ 46167:8a4914397d02

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rust: introduce Repo and Vfs types for filesystem abstraction This is similar to the corresponding Python classes. Repo represents a repository and knows the path to the `.hg` directory, the `store` directory, and the working directory. Separating these will enable supporting the share extension. A Vfs is created from a Repo for one of these three directories. It has filesystem access APIs that take a relative std::path::Path as a parameter. Differential Revision: https://phab.mercurial-scm.org/D9596
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 14 Dec 2020 16:33:15 +0100
parents dca9cb99971c
children 645ee7225fab
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // list_tracked_files.rs
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2 //
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3 // Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use std::convert::From;
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9 use std::path::PathBuf;
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10
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11 use crate::repo::Repo;
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12 use crate::revlog::changelog::Changelog;
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13 use crate::revlog::manifest::Manifest;
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14 use crate::revlog::path_encode::path_encode;
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15 use crate::revlog::revlog::Revlog;
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16 use crate::revlog::revlog::RevlogError;
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17 use crate::revlog::Node;
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18 use crate::revlog::NodePrefix;
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19 use crate::revlog::Revision;
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20 use crate::utils::files::get_path_from_bytes;
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21 use crate::utils::hg_path::{HgPath, HgPathBuf};
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22
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23 const METADATA_DELIMITER: [u8; 2] = [b'\x01', b'\n'];
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24
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25 /// Kind of error encountered by `CatRev`
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26 #[derive(Debug)]
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27 pub enum CatRevErrorKind {
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28 /// Error when reading a `revlog` file.
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29 IoError(std::io::Error),
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30 /// The revision has not been found.
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31 InvalidRevision,
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32 /// Found more than one revision whose ID match the requested prefix
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33 AmbiguousPrefix,
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34 /// A `revlog` file is corrupted.
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35 CorruptedRevlog,
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36 /// The `revlog` format version is not supported.
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37 UnsuportedRevlogVersion(u16),
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38 /// The `revlog` data format is not supported.
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39 UnknowRevlogDataFormat(u8),
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40 }
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41
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42 /// A `CatRev` error
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43 #[derive(Debug)]
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44 pub struct CatRevError {
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45 /// Kind of error encountered by `CatRev`
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46 pub kind: CatRevErrorKind,
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47 }
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48
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49 impl From<CatRevErrorKind> for CatRevError {
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50 fn from(kind: CatRevErrorKind) -> Self {
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51 CatRevError { kind }
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52 }
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53 }
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54
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55 impl From<RevlogError> for CatRevError {
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56 fn from(err: RevlogError) -> Self {
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57 match err {
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58 RevlogError::IoError(err) => CatRevErrorKind::IoError(err),
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59 RevlogError::UnsuportedVersion(version) => {
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60 CatRevErrorKind::UnsuportedRevlogVersion(version)
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61 }
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62 RevlogError::InvalidRevision => CatRevErrorKind::InvalidRevision,
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63 RevlogError::AmbiguousPrefix => CatRevErrorKind::AmbiguousPrefix,
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64 RevlogError::Corrupted => CatRevErrorKind::CorruptedRevlog,
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65 RevlogError::UnknowDataFormat(format) => {
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66 CatRevErrorKind::UnknowRevlogDataFormat(format)
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67 }
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68 }
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69 .into()
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70 }
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71 }
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72
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73 /// List files under Mercurial control at a given revision.
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74 ///
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75 /// * `root`: Repository root
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76 /// * `rev`: The revision to cat the files from.
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77 /// * `files`: The files to output.
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78 pub fn cat(
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79 repo: &Repo,
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80 rev: &str,
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81 files: &[HgPathBuf],
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82 ) -> Result<Vec<u8>, CatRevError> {
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83 let changelog = Changelog::open(repo)?;
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84 let manifest = Manifest::open(repo)?;
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85
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86 let changelog_entry = match rev.parse::<Revision>() {
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87 Ok(rev) => changelog.get_rev(rev)?,
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88 _ => {
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89 let changelog_node = NodePrefix::from_hex(&rev)
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90 .map_err(|_| CatRevErrorKind::InvalidRevision)?;
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91 changelog.get_node(changelog_node.borrow())?
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92 }
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93 };
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94 let manifest_node = Node::from_hex(&changelog_entry.manifest_node()?)
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95 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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96
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97 let manifest_entry = manifest.get_node((&manifest_node).into())?;
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98 let mut bytes = vec![];
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99
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100 for (manifest_file, node_bytes) in manifest_entry.files_with_nodes() {
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101 for cat_file in files.iter() {
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102 if cat_file.as_bytes() == manifest_file.as_bytes() {
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103 let index_path = store_path(manifest_file, b".i");
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104 let data_path = store_path(manifest_file, b".d");
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105
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106 let file_log =
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107 Revlog::open(repo, &index_path, Some(&data_path))?;
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108 let file_node = Node::from_hex(node_bytes)
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109 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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110 let file_rev = file_log.get_node_rev((&file_node).into())?;
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111 let data = file_log.get_rev_data(file_rev)?;
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112 if data.starts_with(&METADATA_DELIMITER) {
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113 let end_delimiter_position = data
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114 [METADATA_DELIMITER.len()..]
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115 .windows(METADATA_DELIMITER.len())
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116 .position(|bytes| bytes == METADATA_DELIMITER);
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117 if let Some(position) = end_delimiter_position {
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118 let offset = METADATA_DELIMITER.len() * 2;
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119 bytes.extend(data[position + offset..].iter());
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120 }
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121 } else {
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122 bytes.extend(data);
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123 }
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124 }
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125 }
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522ec3dc44b9 hg-core: add a `CatRev` operation
Antoine Cezar <antoine.cezar@octobus.net>
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126 }
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127
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128 Ok(bytes)
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129 }
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7252f5237352 hg-core: fix path encoding usage
Antoine cezar<acezar@chwitlabs.fr>
parents: 45804
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130
46167
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Simon Sapin <simon.sapin@octobus.net>
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131 fn store_path(hg_path: &HgPath, suffix: &[u8]) -> PathBuf {
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132 let encoded_bytes =
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133 path_encode(&[b"data/", hg_path.as_bytes(), suffix].concat());
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134 get_path_from_bytes(&encoded_bytes).into()
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135 }