annotate rust/hg-core/src/repo.rs @ 47410:ebdef6283798

rhg: read [paths] for `--repository` value hg parses `-R` and `--repository` CLI arguments "early" in order to know which local repository to load config from. (Config can then affect whether or how to fall back.) The value of of those arguments can be not only a filesystem path, but also an alias configured in the `[paths]` section. This part was missing in rhg and this patch implements that. The current patch still lacks functionality to read config of current repository if we are not at root of repo. That will be fixed in upcoming patches. A new crate `home` is added to get path of home directory. Differential Revision: https://phab.mercurial-scm.org/D10296
author Pulkit Goyal <7895pulkit@gmail.com>
date Sun, 11 Apr 2021 00:50:10 +0530
parents bd88b6bfd8da
children 88119fffecc8
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<PathBuf>,
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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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diff changeset
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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parents:
diff changeset
204 /// (`.hg/store`).
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diff changeset
205 pub fn hg_vfs(&self) -> Vfs<'_> {
46167
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diff changeset
206 Vfs { base: &self.dot_hg }
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diff changeset
207 }
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parents:
diff changeset
208
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diff changeset
209 /// For accessing repository store files (in `.hg/store`)
46638
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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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parents:
diff changeset
212 }
8a4914397d02 rust: introduce Repo and Vfs types for filesystem abstraction
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parents:
diff changeset
213
8a4914397d02 rust: introduce Repo and Vfs types for filesystem abstraction
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parents:
diff changeset
214 /// For accessing the working copy
46822
c71e8d9e7f2a rhg: Initial support for the 'status' command
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diff changeset
215 pub fn working_directory_vfs(&self) -> Vfs<'_> {
46167
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parents:
diff changeset
216 Vfs {
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parents:
diff changeset
217 base: &self.working_directory,
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diff changeset
218 }
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diff changeset
219 }
46640
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220
47380
bd88b6bfd8da rhg: Add support for dirstate-v2
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diff changeset
221 pub fn has_dirstate_v2(&self) -> bool {
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222 self.requirements
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diff changeset
223 .contains(requirements::DIRSTATE_V2_REQUIREMENT)
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diff changeset
224 }
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225
46640
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diff changeset
226 pub fn dirstate_parents(
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diff changeset
227 &self,
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
228 ) -> Result<crate::dirstate::DirstateParents, HgError> {
755c31a1caf9 rhg: Add support for the blackbox extension
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diff changeset
229 let dirstate = self.hg_vfs().mmap_open("dirstate")?;
47380
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parents: 46822
diff changeset
230 if dirstate.is_empty() {
bd88b6bfd8da rhg: Add support for dirstate-v2
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parents: 46822
diff changeset
231 return Ok(crate::dirstate::DirstateParents::NULL);
bd88b6bfd8da rhg: Add support for dirstate-v2
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
232 }
bd88b6bfd8da rhg: Add support for dirstate-v2
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
233 let parents = if self.has_dirstate_v2() {
bd88b6bfd8da rhg: Add support for dirstate-v2
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diff changeset
234 crate::dirstate_tree::on_disk::parse_dirstate_parents(&dirstate)?
bd88b6bfd8da rhg: Add support for dirstate-v2
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parents: 46822
diff changeset
235 } else {
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Simon Sapin <simon.sapin@octobus.net>
parents: 46822
diff changeset
236 crate::dirstate::parsers::parse_dirstate_parents(&dirstate)?
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Simon Sapin <simon.sapin@octobus.net>
parents: 46822
diff changeset
237 };
46640
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diff changeset
238 Ok(parents.clone())
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diff changeset
239 }
46167
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240 }
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parents:
diff changeset
241
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parents:
diff changeset
242 impl Vfs<'_> {
46638
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diff changeset
243 pub fn join(&self, relative_path: impl AsRef<Path>) -> PathBuf {
46514
1dcd9c9975ed rust: Fold find_root and check_requirements into Repo::find
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diff changeset
244 self.base.join(relative_path)
1dcd9c9975ed rust: Fold find_root and check_requirements into Repo::find
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diff changeset
245 }
1dcd9c9975ed rust: Fold find_root and check_requirements into Repo::find
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246
46638
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diff changeset
247 pub fn read(
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>,
46511
43d63979a75e rust: use HgError in RevlogError and Vfs
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diff changeset
250 ) -> Result<Vec<u8>, HgError> {
46514
1dcd9c9975ed rust: Fold find_root and check_requirements into Repo::find
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parents: 46511
diff changeset
251 let path = self.join(relative_path);
46638
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diff changeset
252 std::fs::read(&path).when_reading_file(&path)
46167
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diff changeset
253 }
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254
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255 pub fn mmap_open(
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256 &self,
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257 relative_path: impl AsRef<Path>,
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258 ) -> Result<Mmap, HgError> {
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259 let path = self.base.join(relative_path);
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260 let file = std::fs::File::open(&path).when_reading_file(&path)?;
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261 // TODO: what are the safety requirements here?
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262 let mmap = unsafe { MmapOptions::new().map(&file) }
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263 .when_reading_file(&path)?;
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264 Ok(mmap)
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265 }
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266
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267 pub fn rename(
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268 &self,
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269 relative_from: impl AsRef<Path>,
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270 relative_to: impl AsRef<Path>,
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271 ) -> Result<(), HgError> {
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272 let from = self.join(relative_from);
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273 let to = self.join(relative_to);
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274 std::fs::rename(&from, &to)
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275 .with_context(|| IoErrorContext::RenamingFile { from, to })
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276 }
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277 }