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annotate rust/hg-core/src/repo.rs @ 46462:d03b0601e0eb

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rhg: initial support for shared repositories Differential Revision: https://phab.mercurial-scm.org/D9941
author Simon Sapin <simon.sapin@octobus.net>
date Thu, 14 Jan 2021 13:04:12 +0100
parents 1dcd9c9975ed
children 95b276283b67
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 let hg_vfs = Vfs { base: &dot_hg };
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51 let reqs = requirements::load_if_exists(hg_vfs)?;
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52 let relative =
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53 reqs.contains(requirements::RELATIVE_SHARED_REQUIREMENT);
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54 let shared =
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55 reqs.contains(requirements::SHARED_REQUIREMENT) || relative;
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56 let store_path;
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57 if !shared {
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58 store_path = dot_hg.join("store");
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59 } else {
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60 let bytes = hg_vfs.read("sharedpath")?;
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61 let mut shared_path = get_path_from_bytes(&bytes).to_owned();
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62 if relative {
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63 shared_path = dot_hg.join(shared_path)
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64 }
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65 if !shared_path.is_dir() {
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66 return Err(HgError::corrupted(format!(
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67 ".hg/sharedpath points to nonexistent directory {}",
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68 shared_path.display()
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69 )));
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70 }
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71
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72 store_path = shared_path.join("store");
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73 }
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74
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75 let repo = Self {
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76 requirements: reqs,
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77 working_directory,
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78 store: store_path,
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79 dot_hg,
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80 };
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81
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82 requirements::check(&repo)?;
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83
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84 Ok(repo)
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85 }
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86
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87 pub fn working_directory_path(&self) -> &Path {
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88 &self.working_directory
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89 }
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90
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91 pub fn requirements(&self) -> &HashSet<String> {
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92 &self.requirements
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93 }
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94
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95 /// For accessing repository files (in `.hg`), except for the store
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96 /// (`.hg/store`).
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97 pub(crate) fn hg_vfs(&self) -> Vfs<'_> {
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98 Vfs { base: &self.dot_hg }
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99 }
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100
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101 /// For accessing repository store files (in `.hg/store`)
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102 pub(crate) fn store_vfs(&self) -> Vfs<'_> {
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103 Vfs { base: &self.store }
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104 }
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105
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106 /// For accessing the working copy
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107
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108 // The undescore prefix silences the "never used" warning. Remove before
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109 // using.
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110 pub(crate) fn _working_directory_vfs(&self) -> Vfs<'_> {
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111 Vfs {
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112 base: &self.working_directory,
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113 }
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114 }
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115 }
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116
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117 impl Vfs<'_> {
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118 pub(crate) fn join(&self, relative_path: impl AsRef<Path>) -> PathBuf {
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119 self.base.join(relative_path)
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120 }
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121
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122 pub(crate) fn read(
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123 &self,
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124 relative_path: impl AsRef<Path>,
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125 ) -> Result<Vec<u8>, HgError> {
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126 let path = self.join(relative_path);
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127 std::fs::read(&path).for_file(&path)
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128 }
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129
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130 pub(crate) fn mmap_open(
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131 &self,
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132 relative_path: impl AsRef<Path>,
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133 ) -> Result<Mmap, HgError> {
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134 let path = self.base.join(relative_path);
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135 let file = std::fs::File::open(&path).for_file(&path)?;
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136 // TODO: what are the safety requirements here?
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137 let mmap = unsafe { MmapOptions::new().map(&file) }.for_file(&path)?;
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138 Ok(mmap)
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139 }
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140 }