Mercurial > hg
annotate rust/hg-core/src/repo.rs @ 46482:39128182f04e
rust: Remove unnecessary check for absolute path before joining
`Path::join` does the right thing if its argument is absolute.
Differential Revision: https://phab.mercurial-scm.org/D9960
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 01 Feb 2021 13:32:00 +0100 |
parents | 95b276283b67 |
children | a6e4e4650bac |
rev | line source |
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1 use crate::errors::{HgError, IoResultExt}; |
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2 use crate::requirements; |
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3 use crate::utils::files::get_path_from_bytes; |
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4 use memmap::{Mmap, MmapOptions}; |
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5 use std::collections::HashSet; |
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6 use std::path::{Path, PathBuf}; |
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7 |
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8 /// A repository on disk |
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9 pub struct Repo { |
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10 working_directory: PathBuf, |
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11 dot_hg: PathBuf, |
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12 store: PathBuf, |
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13 requirements: HashSet<String>, |
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14 } |
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15 |
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16 #[derive(Debug, derive_more::From)] |
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17 pub enum RepoFindError { |
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18 NotFoundInCurrentDirectoryOrAncestors { |
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19 current_directory: PathBuf, |
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20 }, |
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21 #[from] |
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22 Other(HgError), |
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23 } |
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24 |
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25 /// Filesystem access abstraction for the contents of a given "base" diretory |
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26 #[derive(Clone, Copy)] |
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27 pub(crate) struct Vfs<'a> { |
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28 base: &'a Path, |
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29 } |
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30 |
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31 impl Repo { |
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32 /// Search the current directory and its ancestores for a repository: |
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33 /// a working directory that contains a `.hg` sub-directory. |
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34 pub fn find() -> Result<Self, RepoFindError> { |
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35 let current_directory = crate::utils::current_dir()?; |
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36 // ancestors() is inclusive: it first yields `current_directory` as-is. |
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37 for ancestor in current_directory.ancestors() { |
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38 if ancestor.join(".hg").is_dir() { |
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39 return Ok(Self::new_at_path(ancestor.to_owned())?); |
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40 } |
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41 } |
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42 Err(RepoFindError::NotFoundInCurrentDirectoryOrAncestors { |
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43 current_directory, |
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44 }) |
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45 } |
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46 |
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47 /// To be called after checking that `.hg` is a sub-directory |
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48 fn new_at_path(working_directory: PathBuf) -> Result<Self, HgError> { |
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49 let dot_hg = working_directory.join(".hg"); |
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50 |
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51 let hg_vfs = Vfs { base: &dot_hg }; |
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52 let mut reqs = requirements::load_if_exists(hg_vfs)?; |
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53 let relative = |
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54 reqs.contains(requirements::RELATIVE_SHARED_REQUIREMENT); |
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55 let shared = |
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56 reqs.contains(requirements::SHARED_REQUIREMENT) || relative; |
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57 |
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58 // From `mercurial/localrepo.py`: |
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59 // |
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60 // if .hg/requires contains the sharesafe requirement, it means |
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61 // there exists a `.hg/store/requires` too and we should read it |
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62 // NOTE: presence of SHARESAFE_REQUIREMENT imply that store requirement |
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63 // is present. We never write SHARESAFE_REQUIREMENT for a repo if store |
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64 // is not present, refer checkrequirementscompat() for that |
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65 // |
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66 // However, if SHARESAFE_REQUIREMENT is not present, it means that the |
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67 // repository was shared the old way. We check the share source |
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68 // .hg/requires for SHARESAFE_REQUIREMENT to detect whether the |
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69 // current repository needs to be reshared |
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70 let share_safe = reqs.contains(requirements::SHARESAFE_REQUIREMENT); |
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71 |
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72 let store_path; |
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73 if !shared { |
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74 store_path = dot_hg.join("store"); |
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75 if share_safe { |
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76 reqs.extend(requirements::load(Vfs { base: &store_path })?); |
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77 } |
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78 } else { |
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79 let bytes = hg_vfs.read("sharedpath")?; |
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80 let mut shared_path = get_path_from_bytes(&bytes).to_owned(); |
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81 if relative { |
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82 shared_path = dot_hg.join(shared_path) |
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83 } |
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84 if !shared_path.is_dir() { |
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85 return Err(HgError::corrupted(format!( |
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86 ".hg/sharedpath points to nonexistent directory {}", |
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87 shared_path.display() |
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88 ))); |
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89 } |
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90 |
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91 store_path = shared_path.join("store"); |
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92 |
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93 let source_is_share_safe = |
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94 requirements::load(Vfs { base: &shared_path })? |
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95 .contains(requirements::SHARESAFE_REQUIREMENT); |
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96 |
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97 // TODO: support for `share.safe-mismatch.*` config |
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98 if share_safe && !source_is_share_safe { |
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99 return Err(HgError::unsupported("share-safe downgrade")); |
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100 } else if source_is_share_safe && !share_safe { |
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101 return Err(HgError::unsupported("share-safe upgrade")); |
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102 } |
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103 } |
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104 |
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105 let repo = Self { |
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106 requirements: reqs, |
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107 working_directory, |
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108 store: store_path, |
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109 dot_hg, |
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110 }; |
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111 |
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112 requirements::check(&repo)?; |
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113 |
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114 Ok(repo) |
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115 } |
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116 |
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117 pub fn working_directory_path(&self) -> &Path { |
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118 &self.working_directory |
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119 } |
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120 |
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121 pub fn requirements(&self) -> &HashSet<String> { |
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122 &self.requirements |
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123 } |
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124 |
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125 /// For accessing repository files (in `.hg`), except for the store |
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126 /// (`.hg/store`). |
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127 pub(crate) fn hg_vfs(&self) -> Vfs<'_> { |
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128 Vfs { base: &self.dot_hg } |
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129 } |
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130 |
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131 /// For accessing repository store files (in `.hg/store`) |
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132 pub(crate) fn store_vfs(&self) -> Vfs<'_> { |
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133 Vfs { base: &self.store } |
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134 } |
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135 |
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136 /// For accessing the working copy |
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137 |
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138 // The undescore prefix silences the "never used" warning. Remove before |
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139 // using. |
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140 pub(crate) fn _working_directory_vfs(&self) -> Vfs<'_> { |
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141 Vfs { |
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142 base: &self.working_directory, |
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143 } |
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144 } |
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145 } |
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146 |
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147 impl Vfs<'_> { |
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148 pub(crate) fn join(&self, relative_path: impl AsRef<Path>) -> PathBuf { |
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149 self.base.join(relative_path) |
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150 } |
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151 |
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152 pub(crate) fn read( |
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153 &self, |
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154 relative_path: impl AsRef<Path>, |
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155 ) -> Result<Vec<u8>, HgError> { |
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156 let path = self.join(relative_path); |
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157 std::fs::read(&path).for_file(&path) |
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158 } |
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159 |
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160 pub(crate) fn mmap_open( |
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161 &self, |
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162 relative_path: impl AsRef<Path>, |
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163 ) -> Result<Mmap, HgError> { |
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164 let path = self.base.join(relative_path); |
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165 let file = std::fs::File::open(&path).for_file(&path)?; |
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166 // TODO: what are the safety requirements here? |
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167 let mmap = unsafe { MmapOptions::new().map(&file) }.for_file(&path)?; |
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168 Ok(mmap) |
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169 } |
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170 } |