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annotate rust/hg-core/src/vfs.rs @ 48605:a809f1465a76

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filemerge: set default labels a little earlier By setting the default labels a little earlier, we can rely on them always being set, as far as I can tell. It may actually even be fine to rely on that even if we don't set them earlier, but it makes more sense to me to do it. Differential Revision: https://phab.mercurial-scm.org/D12015
author Martin von Zweigbergk <martinvonz@google.com>
date Thu, 20 Jan 2022 13:43:43 -0800
parents abeae090ce67
children ffd4b1f1c9cb
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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 }
47980
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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 }