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annotate rust/hg-core/src/operations/cat.rs @ 46135:cc6faec62cb7

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rust: change &PathBuf parameters to &Path This is just as useful in function bodies, and a less strict requirement for callers. Differential Revision: https://phab.mercurial-scm.org/D9594
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 14 Dec 2020 13:47:44 +0100
parents 88e741bf2d93
children dca9cb99971c
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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::{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::Node;
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17 use crate::revlog::NodePrefix;
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18 use crate::revlog::Revision;
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19 use crate::utils::files::get_path_from_bytes;
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20 use crate::utils::hg_path::{HgPath, HgPathBuf};
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21
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22 const METADATA_DELIMITER: [u8; 2] = [b'\x01', b'\n'];
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23
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24 /// Kind of error encountered by `CatRev`
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25 #[derive(Debug)]
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26 pub enum CatRevErrorKind {
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27 /// Error when reading a `revlog` file.
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28 IoError(std::io::Error),
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29 /// The revision has not been found.
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30 InvalidRevision,
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31 /// Found more than one revision whose ID match the requested prefix
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32 AmbiguousPrefix,
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33 /// A `revlog` file is corrupted.
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34 CorruptedRevlog,
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35 /// The `revlog` format version is not supported.
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36 UnsuportedRevlogVersion(u16),
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37 /// The `revlog` data format is not supported.
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38 UnknowRevlogDataFormat(u8),
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39 }
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40
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41 /// A `CatRev` error
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42 #[derive(Debug)]
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43 pub struct CatRevError {
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44 /// Kind of error encountered by `CatRev`
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45 pub kind: CatRevErrorKind,
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46 }
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47
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48 impl From<CatRevErrorKind> for CatRevError {
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49 fn from(kind: CatRevErrorKind) -> Self {
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50 CatRevError { kind }
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51 }
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52 }
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53
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54 impl From<RevlogError> for CatRevError {
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55 fn from(err: RevlogError) -> Self {
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56 match err {
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57 RevlogError::IoError(err) => CatRevErrorKind::IoError(err),
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58 RevlogError::UnsuportedVersion(version) => {
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59 CatRevErrorKind::UnsuportedRevlogVersion(version)
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60 }
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61 RevlogError::InvalidRevision => CatRevErrorKind::InvalidRevision,
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62 RevlogError::AmbiguousPrefix => CatRevErrorKind::AmbiguousPrefix,
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63 RevlogError::Corrupted => CatRevErrorKind::CorruptedRevlog,
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64 RevlogError::UnknowDataFormat(format) => {
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65 CatRevErrorKind::UnknowRevlogDataFormat(format)
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66 }
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67 }
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68 .into()
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69 }
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70 }
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71
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72 /// List files under Mercurial control at a given revision.
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73 pub struct CatRev<'a> {
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74 root: &'a Path,
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75 /// The revision to cat the files from.
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76 rev: &'a str,
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77 /// The files to output.
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78 files: &'a [HgPathBuf],
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79 /// The changelog file
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80 changelog: Changelog,
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81 /// The manifest file
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82 manifest: Manifest,
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83 /// The manifest entry corresponding to the revision.
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84 ///
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85 /// Used to hold the owner of the returned references.
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86 manifest_entry: Option<ManifestEntry>,
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87 }
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88
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89 impl<'a> CatRev<'a> {
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90 pub fn new(
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91 root: &'a Path,
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92 rev: &'a str,
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93 files: &'a [HgPathBuf],
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94 ) -> Result<Self, CatRevError> {
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95 let changelog = Changelog::open(&root)?;
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96 let manifest = Manifest::open(&root)?;
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97 let manifest_entry = None;
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98
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99 Ok(Self {
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100 root,
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101 rev,
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102 files,
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103 changelog,
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104 manifest,
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105 manifest_entry,
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106 })
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107 }
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108
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109 pub fn run(&mut self) -> Result<Vec<u8>, CatRevError> {
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110 let changelog_entry = match self.rev.parse::<Revision>() {
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111 Ok(rev) => self.changelog.get_rev(rev)?,
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112 _ => {
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113 let changelog_node = NodePrefix::from_hex(&self.rev)
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114 .map_err(|_| CatRevErrorKind::InvalidRevision)?;
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115 self.changelog.get_node(changelog_node.borrow())?
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116 }
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117 };
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118 let manifest_node = Node::from_hex(&changelog_entry.manifest_node()?)
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119 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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120
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121 self.manifest_entry =
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122 Some(self.manifest.get_node((&manifest_node).into())?);
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123 if let Some(ref manifest_entry) = self.manifest_entry {
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124 let mut bytes = vec![];
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125
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126 for (manifest_file, node_bytes) in
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127 manifest_entry.files_with_nodes()
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128 {
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129 for cat_file in self.files.iter() {
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130 if cat_file.as_bytes() == manifest_file.as_bytes() {
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131 let index_path =
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132 store_path(self.root, manifest_file, b".i");
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133 let data_path =
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134 store_path(self.root, manifest_file, b".d");
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135
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136 let file_log =
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137 Revlog::open(&index_path, Some(&data_path))?;
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138 let file_node = Node::from_hex(node_bytes)
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139 .map_err(|_| CatRevErrorKind::CorruptedRevlog)?;
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140 let file_rev =
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141 file_log.get_node_rev((&file_node).into())?;
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142 let data = file_log.get_rev_data(file_rev)?;
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143 if data.starts_with(&METADATA_DELIMITER) {
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144 let end_delimiter_position = data
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145 [METADATA_DELIMITER.len()..]
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146 .windows(METADATA_DELIMITER.len())
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147 .position(|bytes| bytes == METADATA_DELIMITER);
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148 if let Some(position) = end_delimiter_position {
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149 let offset = METADATA_DELIMITER.len() * 2;
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150 bytes.extend(data[position + offset..].iter());
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151 }
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152 } else {
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153 bytes.extend(data);
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154 }
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155 }
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156 }
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157 }
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158
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159 Ok(bytes)
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160 } else {
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161 unreachable!("manifest_entry should have been stored");
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162 }
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163 }
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164 }
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165
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166 fn store_path(root: &Path, hg_path: &HgPath, suffix: &[u8]) -> PathBuf {
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167 let encoded_bytes =
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168 path_encode(&[b"data/", hg_path.as_bytes(), suffix].concat());
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169 [
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170 root,
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171 &Path::new(".hg/store/"),
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172 get_path_from_bytes(&encoded_bytes),
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173 ]
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174 .iter()
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175 .collect()
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176 }