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annotate rust/hg-core/src/operations/cat.rs @ 45541:522ec3dc44b9

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hg-core: add a `CatRev` operation Differential Revision: https://phab.mercurial-scm.org/D9051
author Antoine Cezar <antoine.cezar@octobus.net>
date Fri, 11 Sep 2020 17:32:53 +0200
parents
children 6991f3014311
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45541
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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::revlog::changelog::Changelog;
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12 use crate::revlog::manifest::{Manifest, ManifestEntry};
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13 use crate::revlog::path_encode::path_encode;
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14 use crate::revlog::revlog::Revlog;
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15 use crate::revlog::revlog::RevlogError;
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16 use crate::revlog::Revision;
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17 use crate::utils::hg_path::HgPathBuf;
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18
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19 /// Kind of error encountered by `CatRev`
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20 #[derive(Debug)]
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21 pub enum CatRevErrorKind {
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22 /// Error when reading a `revlog` file.
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23 IoError(std::io::Error),
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24 /// The revision has not been found.
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25 InvalidRevision,
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26 /// A `revlog` file is corrupted.
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27 CorruptedRevlog,
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28 /// The `revlog` format version is not supported.
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29 UnsuportedRevlogVersion(u16),
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30 /// The `revlog` data format is not supported.
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31 UnknowRevlogDataFormat(u8),
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32 }
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33
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34 /// A `CatRev` error
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35 #[derive(Debug)]
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36 pub struct CatRevError {
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37 /// Kind of error encountered by `CatRev`
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38 pub kind: CatRevErrorKind,
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39 }
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40
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41 impl From<CatRevErrorKind> for CatRevError {
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42 fn from(kind: CatRevErrorKind) -> Self {
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43 CatRevError { kind }
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44 }
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45 }
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46
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47 impl From<RevlogError> for CatRevError {
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48 fn from(err: RevlogError) -> Self {
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49 match err {
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50 RevlogError::IoError(err) => CatRevErrorKind::IoError(err),
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51 RevlogError::UnsuportedVersion(version) => {
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52 CatRevErrorKind::UnsuportedRevlogVersion(version)
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53 }
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54 RevlogError::InvalidRevision => CatRevErrorKind::InvalidRevision,
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55 RevlogError::Corrupted => CatRevErrorKind::CorruptedRevlog,
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56 RevlogError::UnknowDataFormat(format) => {
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57 CatRevErrorKind::UnknowRevlogDataFormat(format)
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58 }
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59 }
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60 .into()
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61 }
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62 }
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63
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64 /// List files under Mercurial control at a given revision.
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65 pub struct CatRev<'a> {
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66 root: &'a PathBuf,
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67 /// The revision to cat the files from.
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68 rev: &'a str,
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69 /// The files to output.
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70 files: &'a [HgPathBuf],
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71 /// The changelog file
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72 changelog: Changelog,
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73 /// The manifest file
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74 manifest: Manifest,
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75 /// The manifest entry corresponding to the revision.
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76 ///
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77 /// Used to hold the owner of the returned references.
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78 manifest_entry: Option<ManifestEntry>,
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79 }
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80
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81 impl<'a> CatRev<'a> {
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82 pub fn new(
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83 root: &'a PathBuf,
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84 rev: &'a str,
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85 files: &'a [HgPathBuf],
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86 ) -> Result<Self, CatRevError> {
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87 let changelog = Changelog::open(&root)?;
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88 let manifest = Manifest::open(&root)?;
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89 let manifest_entry = None;
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90
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91 Ok(Self {
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92 root,
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93 rev,
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94 files,
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95 changelog,
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96 manifest,
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97 manifest_entry,
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98 })
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99 }
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100
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101 pub fn run(&mut self) -> Result<Vec<u8>, CatRevError> {
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102 let changelog_entry = match self.rev.parse::<Revision>() {
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103 Ok(rev) => self.changelog.get_rev(rev)?,
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104 _ => {
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105 let changelog_node = hex::decode(&self.rev)
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106 .map_err(|_| CatRevErrorKind::InvalidRevision)?;
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107 self.changelog.get_node(&changelog_node)?
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108 }
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109 };
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110 let manifest_node = hex::decode(&changelog_entry.manifest_node()?)
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111 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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112
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113 self.manifest_entry = Some(self.manifest.get_node(&manifest_node)?);
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114 if let Some(ref manifest_entry) = self.manifest_entry {
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115 let mut bytes = vec![];
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116
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117 for (manifest_file, node_bytes) in
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118 manifest_entry.files_with_nodes()
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119 {
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120 for cat_file in self.files.iter() {
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121 if cat_file.as_bytes() == manifest_file.as_bytes() {
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122 let encoded_bytes =
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123 path_encode(manifest_file.as_bytes());
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124 let revlog_index_string = format!(
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125 ".hg/store/data/{}.i",
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126 String::from_utf8_lossy(&encoded_bytes),
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127 );
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128 let revlog_index_path =
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129 self.root.join(&revlog_index_string);
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130 let file_log = Revlog::open(&revlog_index_path)?;
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131 let file_node = hex::decode(&node_bytes)
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132 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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133 let file_rev = file_log.get_node_rev(&file_node)?;
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134 let data = file_log.get_rev_data(file_rev)?;
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135 bytes.extend(data);
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136 }
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137 }
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138 }
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139
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140 Ok(bytes)
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141 } else {
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142 unreachable!("manifest_entry should have been stored");
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143 }
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144 }
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145 }