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annotate rust/hg-core/src/vfs.rs @ 49146:802e2c25dab8 stable

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rust-dirstate-v2: clean up previous data file after the docket is written This was overlooked before and caused many data files to keep living forever. We could potentially consider adding a random cleanup of them in case they slipped through one day. Differential Revision: https://phab.mercurial-scm.org/D12581
author Rapha?l Gom?s <rgomes@octobus.net>
date Thu, 21 Apr 2022 15:10:57 +0200
parents abeae090ce67
children ffd4b1f1c9cb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::errors::{HgError, IoErrorContext, IoResultExt};
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2 use memmap2::{Mmap, MmapOptions};
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3 use std::io::{ErrorKind, Write};
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4 use std::path::{Path, PathBuf};
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5
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6 /// Filesystem access abstraction for the contents of a given "base" diretory
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7 #[derive(Clone, Copy)]
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8 pub struct Vfs<'a> {
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9 pub(crate) base: &'a Path,
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10 }
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11
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12 struct FileNotFound(std::io::Error, PathBuf);
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13
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14 impl Vfs<'_> {
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15 pub fn join(&self, relative_path: impl AsRef<Path>) -> PathBuf {
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16 self.base.join(relative_path)
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17 }
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18
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19 pub fn symlink_metadata(
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20 &self,
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21 relative_path: impl AsRef<Path>,
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22 ) -> Result<std::fs::Metadata, HgError> {
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23 let path = self.join(relative_path);
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24 std::fs::symlink_metadata(&path).when_reading_file(&path)
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25 }
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26
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27 pub fn read_link(
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28 &self,
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29 relative_path: impl AsRef<Path>,
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30 ) -> Result<PathBuf, HgError> {
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31 let path = self.join(relative_path);
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32 std::fs::read_link(&path).when_reading_file(&path)
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33 }
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34
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35 pub fn read(
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36 &self,
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37 relative_path: impl AsRef<Path>,
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38 ) -> Result<Vec<u8>, HgError> {
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39 let path = self.join(relative_path);
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40 std::fs::read(&path).when_reading_file(&path)
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41 }
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42
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43 fn mmap_open_gen(
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44 &self,
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45 relative_path: impl AsRef<Path>,
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46 ) -> Result<Result<Mmap, FileNotFound>, HgError> {
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47 let path = self.join(relative_path);
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48 let file = match std::fs::File::open(&path) {
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49 Err(err) => {
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50 if let ErrorKind::NotFound = err.kind() {
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51 return Ok(Err(FileNotFound(err, path)));
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52 };
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53 return (Err(err)).when_reading_file(&path);
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54 }
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55 Ok(file) => file,
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56 };
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57 // TODO: what are the safety requirements here?
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58 let mmap = unsafe { MmapOptions::new().map(&file) }
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59 .when_reading_file(&path)?;
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60 Ok(Ok(mmap))
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61 }
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62
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63 pub fn mmap_open_opt(
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64 &self,
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65 relative_path: impl AsRef<Path>,
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66 ) -> Result<Option<Mmap>, HgError> {
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67 self.mmap_open_gen(relative_path).map(|res| res.ok())
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68 }
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69
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70 pub fn mmap_open(
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71 &self,
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72 relative_path: impl AsRef<Path>,
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73 ) -> Result<Mmap, HgError> {
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74 match self.mmap_open_gen(relative_path)? {
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75 Err(FileNotFound(err, path)) => Err(err).when_reading_file(&path),
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76 Ok(res) => Ok(res),
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77 }
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78 }
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79
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80 pub fn rename(
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81 &self,
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82 relative_from: impl AsRef<Path>,
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83 relative_to: impl AsRef<Path>,
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84 ) -> Result<(), HgError> {
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85 let from = self.join(relative_from);
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86 let to = self.join(relative_to);
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87 std::fs::rename(&from, &to)
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88 .with_context(|| IoErrorContext::RenamingFile { from, to })
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89 }
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90
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91 pub fn remove_file(
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92 &self,
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93 relative_path: impl AsRef<Path>,
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94 ) -> Result<(), HgError> {
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95 let path = self.join(relative_path);
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96 std::fs::remove_file(&path)
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97 .with_context(|| IoErrorContext::RemovingFile(path))
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98 }
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99
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100 #[cfg(unix)]
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101 pub fn create_symlink(
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102 &self,
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103 relative_link_path: impl AsRef<Path>,
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104 target_path: impl AsRef<Path>,
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105 ) -> Result<(), HgError> {
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106 let link_path = self.join(relative_link_path);
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107 std::os::unix::fs::symlink(target_path, &link_path)
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108 .when_writing_file(&link_path)
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109 }
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110
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111 /// Write `contents` into a temporary file, then rename to `relative_path`.
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112 /// This makes writing to a file "atomic": a reader opening that path will
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113 /// see either the previous contents of the file or the complete new
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114 /// content, never a partial write.
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115 pub fn atomic_write(
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116 &self,
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117 relative_path: impl AsRef<Path>,
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118 contents: &[u8],
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119 ) -> Result<(), HgError> {
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120 let mut tmp = tempfile::NamedTempFile::new_in(self.base)
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121 .when_writing_file(self.base)?;
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122 tmp.write_all(contents)
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123 .and_then(|()| tmp.flush())
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124 .when_writing_file(tmp.path())?;
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125 let path = self.join(relative_path);
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126 tmp.persist(&path)
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127 .map_err(|e| e.error)
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128 .when_writing_file(&path)?;
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129 Ok(())
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130 }
47952
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131 }
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132
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133 fn fs_metadata(
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134 path: impl AsRef<Path>,
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135 ) -> Result<Option<std::fs::Metadata>, HgError> {
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136 let path = path.as_ref();
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137 match std::fs::metadata(path) {
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138 Ok(meta) => Ok(Some(meta)),
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139 Err(error) => match error.kind() {
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140 // TODO: when we require a Rust version where `NotADirectory` is
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141 // stable, invert this logic and return None for it and `NotFound`
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142 // and propagate any other error.
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143 ErrorKind::PermissionDenied => Err(error).with_context(|| {
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144 IoErrorContext::ReadingMetadata(path.to_owned())
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145 }),
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146 _ => Ok(None),
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147 },
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148 }
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149 }
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150
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151 pub(crate) fn is_dir(path: impl AsRef<Path>) -> Result<bool, HgError> {
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152 Ok(fs_metadata(path)?.map_or(false, |meta| meta.is_dir()))
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153 }
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154
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155 pub(crate) fn is_file(path: impl AsRef<Path>) -> Result<bool, HgError> {
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156 Ok(fs_metadata(path)?.map_or(false, |meta| meta.is_file()))
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157 }