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annotate rust/hg-core/src/errors.rs @ 48464:abeae090ce67

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rust: Add Vfs::write_atomic This method writes to a temporary file then renames in place Differential Revision: https://phab.mercurial-scm.org/D11836
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 29 Nov 2021 18:46:04 +0100
parents cf5f8da2244c
children 3f86ee422095
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::config::ConfigValueParseError;
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2 use crate::exit_codes;
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3 use std::fmt;
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4
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5 /// Common error cases that can happen in many different APIs
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6 #[derive(Debug, derive_more::From)]
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7 pub enum HgError {
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8 IoError {
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9 error: std::io::Error,
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10 context: IoErrorContext,
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11 },
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12
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13 /// A file under `.hg/` normally only written by Mercurial is not in the
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14 /// expected format. This indicates a bug in Mercurial, filesystem
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15 /// corruption, or hardware failure.
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16 ///
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17 /// The given string is a short explanation for users, not intended to be
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18 /// machine-readable.
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19 CorruptedRepository(String),
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20
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21 /// The respository or requested operation involves a feature not
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22 /// supported by the Rust implementation. Falling back to the Python
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23 /// implementation may or may not work.
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24 ///
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25 /// The given string is a short explanation for users, not intended to be
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26 /// machine-readable.
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27 UnsupportedFeature(String),
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28
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29 /// Operation cannot proceed for some other reason.
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30 ///
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31 /// The message is a short explanation for users, not intended to be
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32 /// machine-readable.
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33 Abort {
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34 message: String,
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35 detailed_exit_code: exit_codes::ExitCode,
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36 },
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37
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38 /// A configuration value is not in the expected syntax.
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39 ///
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40 /// These errors can happen in many places in the code because values are
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41 /// parsed lazily as the file-level parser does not know the expected type
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42 /// and syntax of each value.
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43 #[from]
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44 ConfigValueParseError(ConfigValueParseError),
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45 }
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46
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47 /// Details about where an I/O error happened
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48 #[derive(Debug)]
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49 pub enum IoErrorContext {
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50 /// `std::fs::metadata`
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51 ReadingMetadata(std::path::PathBuf),
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52 ReadingFile(std::path::PathBuf),
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53 WritingFile(std::path::PathBuf),
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54 RemovingFile(std::path::PathBuf),
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55 RenamingFile {
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56 from: std::path::PathBuf,
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57 to: std::path::PathBuf,
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58 },
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59 /// `std::fs::canonicalize`
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60 CanonicalizingPath(std::path::PathBuf),
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61 /// `std::env::current_dir`
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62 CurrentDir,
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63 /// `std::env::current_exe`
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64 CurrentExe,
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65 }
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66
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67 impl HgError {
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68 pub fn corrupted(explanation: impl Into<String>) -> Self {
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69 // TODO: capture a backtrace here and keep it in the error value
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70 // to aid debugging?
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71 // https://doc.rust-lang.org/std/backtrace/struct.Backtrace.html
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72 HgError::CorruptedRepository(explanation.into())
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73 }
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74
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75 pub fn unsupported(explanation: impl Into<String>) -> Self {
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76 HgError::UnsupportedFeature(explanation.into())
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77 }
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78
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79 pub fn abort(
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80 explanation: impl Into<String>,
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81 exit_code: exit_codes::ExitCode,
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82 ) -> Self {
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83 HgError::Abort {
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84 message: explanation.into(),
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85 detailed_exit_code: exit_code,
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86 }
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87 }
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88 }
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89
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90 // TODO: use `DisplayBytes` instead to show non-Unicode filenames losslessly?
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91 impl fmt::Display for HgError {
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92 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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93 match self {
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94 HgError::Abort { message, .. } => write!(f, "{}", message),
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95 HgError::IoError { error, context } => {
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96 write!(f, "abort: {}: {}", context, error)
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97 }
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98 HgError::CorruptedRepository(explanation) => {
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99 write!(f, "abort: {}", explanation)
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100 }
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101 HgError::UnsupportedFeature(explanation) => {
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102 write!(f, "unsupported feature: {}", explanation)
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103 }
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104 HgError::ConfigValueParseError(error) => error.fmt(f),
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105 }
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106 }
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107 }
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108
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109 // TODO: use `DisplayBytes` instead to show non-Unicode filenames losslessly?
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110 impl fmt::Display for IoErrorContext {
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111 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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112 match self {
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113 IoErrorContext::ReadingMetadata(path) => {
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114 write!(f, "when reading metadata of {}", path.display())
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115 }
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116 IoErrorContext::ReadingFile(path) => {
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117 write!(f, "when reading {}", path.display())
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118 }
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119 IoErrorContext::WritingFile(path) => {
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120 write!(f, "when writing {}", path.display())
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121 }
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122 IoErrorContext::RemovingFile(path) => {
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123 write!(f, "when removing {}", path.display())
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124 }
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125 IoErrorContext::RenamingFile { from, to } => write!(
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126 f,
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127 "when renaming {} to {}",
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128 from.display(),
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129 to.display()
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130 ),
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131 IoErrorContext::CanonicalizingPath(path) => {
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132 write!(f, "when canonicalizing {}", path.display())
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133 }
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134 IoErrorContext::CurrentDir => {
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135 write!(f, "error getting current working directory")
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136 }
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137 IoErrorContext::CurrentExe => {
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138 write!(f, "error getting current executable")
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139 }
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140 }
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141 }
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142 }
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143
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144 pub trait IoResultExt<T> {
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145 /// Annotate a possible I/O error as related to a reading a file at the
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146 /// given path.
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147 ///
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148 /// This allows printing something like “File not found when reading
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149 /// example.txt” instead of just “File not found”.
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150 ///
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151 /// Converts a `Result` with `std::io::Error` into one with `HgError`.
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152 fn when_reading_file(self, path: &std::path::Path) -> Result<T, HgError>;
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153
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154 fn when_writing_file(self, path: &std::path::Path) -> Result<T, HgError>;
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155
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156 fn with_context(
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157 self,
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158 context: impl FnOnce() -> IoErrorContext,
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159 ) -> Result<T, HgError>;
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160 }
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161
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162 impl<T> IoResultExt<T> for std::io::Result<T> {
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163 fn when_reading_file(self, path: &std::path::Path) -> Result<T, HgError> {
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164 self.with_context(|| IoErrorContext::ReadingFile(path.to_owned()))
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165 }
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166
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167 fn when_writing_file(self, path: &std::path::Path) -> Result<T, HgError> {
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168 self.with_context(|| IoErrorContext::WritingFile(path.to_owned()))
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169 }
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170
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171 fn with_context(
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172 self,
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173 context: impl FnOnce() -> IoErrorContext,
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174 ) -> Result<T, HgError> {
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175 self.map_err(|error| HgError::IoError {
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176 error,
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177 context: context(),
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178 })
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179 }
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180 }
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181
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182 pub trait HgResultExt<T> {
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183 /// Handle missing files separately from other I/O error cases.
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184 ///
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185 /// Wraps the `Ok` type in an `Option`:
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186 ///
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187 /// * `Ok(x)` becomes `Ok(Some(x))`
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188 /// * An I/O "not found" error becomes `Ok(None)`
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189 /// * Other errors are unchanged
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190 fn io_not_found_as_none(self) -> Result<Option<T>, HgError>;
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191 }
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192
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193 impl<T> HgResultExt<T> for Result<T, HgError> {
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194 fn io_not_found_as_none(self) -> Result<Option<T>, HgError> {
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195 match self {
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196 Ok(x) => Ok(Some(x)),
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197 Err(HgError::IoError { error, .. })
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198 if error.kind() == std::io::ErrorKind::NotFound =>
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199 {
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200 Ok(None)
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201 }
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202 Err(other_error) => Err(other_error),
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203 }
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204 }
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205 }