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annotate rust/hg-core/src/repo.rs @ 46741:25e3dac511f0

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rhg: Add support for the HGRCSKIPREPO environment variable It?s easy enough and affects tests, well, that test that feature. Differential Revision: https://phab.mercurial-scm.org/D10139
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 08 Mar 2021 08:55:48 +0100
parents 97ac588b6d9e
children c71e8d9e7f2a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::config::{Config, ConfigError, ConfigParseError};
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2 use crate::errors::{HgError, IoErrorContext, IoResultExt};
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3 use crate::requirements;
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4 use crate::utils::files::get_path_from_bytes;
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5 use crate::utils::SliceExt;
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6 use memmap::{Mmap, MmapOptions};
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7 use std::collections::HashSet;
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8 use std::path::{Path, PathBuf};
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9
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10 /// A repository on disk
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11 pub struct Repo {
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12 working_directory: PathBuf,
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13 dot_hg: PathBuf,
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14 store: PathBuf,
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15 requirements: HashSet<String>,
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16 config: Config,
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17 }
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18
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19 #[derive(Debug, derive_more::From)]
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20 pub enum RepoError {
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21 NotFound {
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22 at: PathBuf,
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23 },
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24 #[from]
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25 ConfigParseError(ConfigParseError),
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26 #[from]
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27 Other(HgError),
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28 }
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29
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30 impl From<ConfigError> for RepoError {
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31 fn from(error: ConfigError) -> Self {
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32 match error {
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33 ConfigError::Parse(error) => error.into(),
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34 ConfigError::Other(error) => error.into(),
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35 }
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36 }
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37 }
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38
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39 /// Filesystem access abstraction for the contents of a given "base" diretory
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40 #[derive(Clone, Copy)]
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41 pub struct Vfs<'a> {
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42 pub(crate) base: &'a Path,
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43 }
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44
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45 impl Repo {
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46 /// Find a repository, either at the given path (which must contain a `.hg`
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47 /// sub-directory) or by searching the current directory and its
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48 /// ancestors.
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49 ///
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50 /// A method with two very different "modes" like this usually a code smell
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51 /// to make two methods instead, but in this case an `Option` is what rhg
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52 /// sub-commands get from Clap for the `-R` / `--repository` CLI argument.
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53 /// Having two methods would just move that `if` to almost all callers.
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54 pub fn find(
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55 config: &Config,
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56 explicit_path: Option<&Path>,
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57 ) -> Result<Self, RepoError> {
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58 if let Some(root) = explicit_path {
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59 if root.join(".hg").is_dir() {
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60 Self::new_at_path(root.to_owned(), config)
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61 } else if root.is_file() {
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62 Err(HgError::unsupported("bundle repository").into())
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63 } else {
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64 Err(RepoError::NotFound {
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65 at: root.to_owned(),
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66 })
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67 }
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68 } else {
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69 let current_directory = crate::utils::current_dir()?;
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70 // ancestors() is inclusive: it first yields `current_directory`
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71 // as-is.
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72 for ancestor in current_directory.ancestors() {
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73 if ancestor.join(".hg").is_dir() {
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74 return Self::new_at_path(ancestor.to_owned(), config);
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75 }
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76 }
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77 Err(RepoError::NotFound {
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78 at: current_directory,
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79 })
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80 }
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81 }
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82
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83 /// To be called after checking that `.hg` is a sub-directory
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84 fn new_at_path(
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85 working_directory: PathBuf,
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86 config: &Config,
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87 ) -> Result<Self, RepoError> {
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88 let dot_hg = working_directory.join(".hg");
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89
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90 let mut repo_config_files = Vec::new();
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91 repo_config_files.push(dot_hg.join("hgrc"));
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92 repo_config_files.push(dot_hg.join("hgrc-not-shared"));
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93
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94 let hg_vfs = Vfs { base: &dot_hg };
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95 let mut reqs = requirements::load_if_exists(hg_vfs)?;
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96 let relative =
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97 reqs.contains(requirements::RELATIVE_SHARED_REQUIREMENT);
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98 let shared =
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99 reqs.contains(requirements::SHARED_REQUIREMENT) || relative;
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100
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101 // From `mercurial/localrepo.py`:
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102 //
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103 // if .hg/requires contains the sharesafe requirement, it means
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104 // there exists a `.hg/store/requires` too and we should read it
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105 // NOTE: presence of SHARESAFE_REQUIREMENT imply that store requirement
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106 // is present. We never write SHARESAFE_REQUIREMENT for a repo if store
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107 // is not present, refer checkrequirementscompat() for that
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108 //
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109 // However, if SHARESAFE_REQUIREMENT is not present, it means that the
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110 // repository was shared the old way. We check the share source
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111 // .hg/requires for SHARESAFE_REQUIREMENT to detect whether the
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112 // current repository needs to be reshared
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113 let share_safe = reqs.contains(requirements::SHARESAFE_REQUIREMENT);
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114
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115 let store_path;
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116 if !shared {
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117 store_path = dot_hg.join("store");
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118 } else {
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119 let bytes = hg_vfs.read("sharedpath")?;
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120 let mut shared_path =
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121 get_path_from_bytes(bytes.trim_end_newlines()).to_owned();
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122 if relative {
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123 shared_path = dot_hg.join(shared_path)
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124 }
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125 if !shared_path.is_dir() {
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126 return Err(HgError::corrupted(format!(
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127 ".hg/sharedpath points to nonexistent directory {}",
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128 shared_path.display()
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129 ))
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130 .into());
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131 }
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132
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133 store_path = shared_path.join("store");
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134
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135 let source_is_share_safe =
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136 requirements::load(Vfs { base: &shared_path })?
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137 .contains(requirements::SHARESAFE_REQUIREMENT);
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138
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139 if share_safe && !source_is_share_safe {
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140 return Err(match config
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141 .get(b"share", b"safe-mismatch.source-not-safe")
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142 {
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143 Some(b"abort") | None => HgError::abort(
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144 "abort: share source does not support share-safe requirement\n\
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145 (see `hg help config.format.use-share-safe` for more information)",
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146 ),
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147 _ => HgError::unsupported("share-safe downgrade"),
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148 }
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149 .into());
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150 } else if source_is_share_safe && !share_safe {
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151 return Err(
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152 match config.get(b"share", b"safe-mismatch.source-safe") {
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153 Some(b"abort") | None => HgError::abort(
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154 "abort: version mismatch: source uses share-safe \
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155 functionality while the current share does not\n\
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156 (see `hg help config.format.use-share-safe` for more information)",
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157 ),
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158 _ => HgError::unsupported("share-safe upgrade"),
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159 }
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160 .into(),
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161 );
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162 }
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163
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164 if share_safe {
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165 repo_config_files.insert(0, shared_path.join("hgrc"))
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166 }
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167 }
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168 if share_safe {
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169 reqs.extend(requirements::load(Vfs { base: &store_path })?);
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170 }
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171
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172 let repo_config = if std::env::var_os("HGRCSKIPREPO").is_none() {
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173 config.combine_with_repo(&repo_config_files)?
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174 } else {
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175 config.clone()
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176 };
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177
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178 let repo = Self {
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179 requirements: reqs,
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180 working_directory,
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181 store: store_path,
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182 dot_hg,
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183 config: repo_config,
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184 };
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185
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186 requirements::check(&repo)?;
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187
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188 Ok(repo)
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189 }
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190
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191 pub fn working_directory_path(&self) -> &Path {
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192 &self.working_directory
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193 }
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194
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195 pub fn requirements(&self) -> &HashSet<String> {
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196 &self.requirements
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197 }
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198
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199 pub fn config(&self) -> &Config {
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200 &self.config
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201 }
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202
46167
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203 /// For accessing repository files (in `.hg`), except for the store
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204 /// (`.hg/store`).
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205 pub fn hg_vfs(&self) -> Vfs<'_> {
46167
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206 Vfs { base: &self.dot_hg }
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207 }
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208
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209 /// For accessing repository store files (in `.hg/store`)
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210 pub fn store_vfs(&self) -> Vfs<'_> {
46167
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diff changeset
211 Vfs { base: &self.store }
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diff changeset
212 }
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213
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214 /// For accessing the working copy
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diff changeset
215
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diff changeset
216 // The undescore prefix silences the "never used" warning. Remove before
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diff changeset
217 // using.
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diff changeset
218 pub fn _working_directory_vfs(&self) -> Vfs<'_> {
46167
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diff changeset
219 Vfs {
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diff changeset
220 base: &self.working_directory,
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221 }
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222 }
46601
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223
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224 pub fn dirstate_parents(
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225 &self,
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226 ) -> Result<crate::dirstate::DirstateParents, HgError> {
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227 let dirstate = self.hg_vfs().mmap_open("dirstate")?;
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228 let parents =
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229 crate::dirstate::parsers::parse_dirstate_parents(&dirstate)?;
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230 Ok(parents.clone())
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231 }
46167
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232 }
8a4914397d02 rust: introduce Repo and Vfs types for filesystem abstraction
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233
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diff changeset
234 impl Vfs<'_> {
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235 pub fn join(&self, relative_path: impl AsRef<Path>) -> PathBuf {
46446
1dcd9c9975ed rust: Fold find_root and check_requirements into Repo::find
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236 self.base.join(relative_path)
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237 }
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238
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239 pub fn read(
46167
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diff changeset
240 &self,
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diff changeset
241 relative_path: impl AsRef<Path>,
46443
43d63979a75e rust: use HgError in RevlogError and Vfs
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242 ) -> Result<Vec<u8>, HgError> {
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243 let path = self.join(relative_path);
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244 std::fs::read(&path).when_reading_file(&path)
46167
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245 }
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246
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247 pub fn mmap_open(
46167
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diff changeset
248 &self,
8a4914397d02 rust: introduce Repo and Vfs types for filesystem abstraction
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diff changeset
249 relative_path: impl AsRef<Path>,
46443
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diff changeset
250 ) -> Result<Mmap, HgError> {
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251 let path = self.base.join(relative_path);
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diff changeset
252 let file = std::fs::File::open(&path).when_reading_file(&path)?;
46167
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253 // TODO: what are the safety requirements here?
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254 let mmap = unsafe { MmapOptions::new().map(&file) }
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diff changeset
255 .when_reading_file(&path)?;
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256 Ok(mmap)
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257 }
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258
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259 pub fn rename(
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260 &self,
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261 relative_from: impl AsRef<Path>,
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262 relative_to: impl AsRef<Path>,
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263 ) -> Result<(), HgError> {
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264 let from = self.join(relative_from);
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265 let to = self.join(relative_to);
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266 std::fs::rename(&from, &to)
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267 .with_context(|| IoErrorContext::RenamingFile { from, to })
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268 }
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269 }