Mercurial > hg
annotate rust/hg-core/src/config/config.rs @ 46797:bcdcb4423ae3
rhg: Add more conversions between error types
This allows using the `?` operator in more places, as the next commit does.
Differential Revision: https://phab.mercurial-scm.org/D10238
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 19 Mar 2021 13:18:53 +0100 |
parents | 25e3dac511f0 |
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1 // config.rs |
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2 // |
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3 // Copyright 2020 |
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4 // Valentin Gatien-Baron, |
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5 // Raphaël Gomès <rgomes@octobus.net> |
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6 // |
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7 // This software may be used and distributed according to the terms of the |
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8 // GNU General Public License version 2 or any later version. |
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9 |
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10 use super::layer; |
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11 use super::values; |
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12 use crate::config::layer::{ |
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13 ConfigError, ConfigLayer, ConfigOrigin, ConfigValue, |
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14 }; |
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15 use crate::utils::files::get_bytes_from_os_str; |
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16 use crate::utils::SliceExt; |
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17 use format_bytes::{write_bytes, DisplayBytes}; |
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18 use std::collections::HashSet; |
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19 use std::env; |
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20 use std::fmt; |
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21 use std::path::{Path, PathBuf}; |
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22 use std::str; |
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23 |
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24 use crate::errors::{HgResultExt, IoResultExt}; |
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25 |
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26 /// Holds the config values for the current repository |
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27 /// TODO update this docstring once we support more sources |
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28 #[derive(Clone)] |
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29 pub struct Config { |
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30 layers: Vec<layer::ConfigLayer>, |
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31 } |
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32 |
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33 impl DisplayBytes for Config { |
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34 fn display_bytes( |
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35 &self, |
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36 out: &mut dyn std::io::Write, |
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37 ) -> std::io::Result<()> { |
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38 for (index, layer) in self.layers.iter().rev().enumerate() { |
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39 write_bytes!( |
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40 out, |
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41 b"==== Layer {} (trusted: {}) ====\n{}", |
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42 index, |
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43 if layer.trusted { |
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44 &b"yes"[..] |
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45 } else { |
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46 &b"no"[..] |
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47 }, |
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48 layer |
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49 )?; |
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50 } |
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51 Ok(()) |
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52 } |
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53 } |
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54 |
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55 pub enum ConfigSource { |
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56 /// Absolute path to a config file |
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57 AbsPath(PathBuf), |
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58 /// Already parsed (from the CLI, env, Python resources, etc.) |
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59 Parsed(layer::ConfigLayer), |
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60 } |
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61 |
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62 #[derive(Debug)] |
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63 pub struct ConfigValueParseError { |
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64 pub origin: ConfigOrigin, |
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65 pub line: Option<usize>, |
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66 pub section: Vec<u8>, |
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67 pub item: Vec<u8>, |
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68 pub value: Vec<u8>, |
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69 pub expected_type: &'static str, |
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70 } |
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71 |
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72 impl fmt::Display for ConfigValueParseError { |
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73 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
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74 // TODO: add origin and line number information, here and in |
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75 // corresponding python code |
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76 write!( |
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77 f, |
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78 "config error: {}.{} is not a {} ('{}')", |
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79 String::from_utf8_lossy(&self.section), |
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80 String::from_utf8_lossy(&self.item), |
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81 self.expected_type, |
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82 String::from_utf8_lossy(&self.value) |
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83 ) |
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84 } |
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85 } |
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86 |
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87 impl Config { |
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88 /// Load system and user configuration from various files. |
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89 /// |
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90 /// This is also affected by some environment variables. |
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91 pub fn load( |
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92 cli_config_args: impl IntoIterator<Item = impl AsRef<[u8]>>, |
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93 ) -> Result<Self, ConfigError> { |
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94 let mut config = Self { layers: Vec::new() }; |
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95 let opt_rc_path = env::var_os("HGRCPATH"); |
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96 // HGRCPATH replaces system config |
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97 if opt_rc_path.is_none() { |
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98 config.add_system_config()? |
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99 } |
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100 |
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101 config.add_for_environment_variable("EDITOR", b"ui", b"editor"); |
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102 config.add_for_environment_variable("VISUAL", b"ui", b"editor"); |
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103 config.add_for_environment_variable("PAGER", b"pager", b"pager"); |
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104 |
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105 // These are set by `run-tests.py --rhg` to enable fallback for the |
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106 // entire test suite. Alternatives would be setting configuration |
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107 // through `$HGRCPATH` but some tests override that, or changing the |
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108 // `hg` shell alias to include `--config` but that disrupts tests that |
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109 // print command lines and check expected output. |
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110 config.add_for_environment_variable( |
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111 "RHG_ON_UNSUPPORTED", |
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112 b"rhg", |
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113 b"on-unsupported", |
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114 ); |
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115 config.add_for_environment_variable( |
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116 "RHG_FALLBACK_EXECUTABLE", |
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117 b"rhg", |
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118 b"fallback-executable", |
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119 ); |
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120 |
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121 // HGRCPATH replaces user config |
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122 if opt_rc_path.is_none() { |
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123 config.add_user_config()? |
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124 } |
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125 if let Some(rc_path) = &opt_rc_path { |
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126 for path in env::split_paths(rc_path) { |
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127 if !path.as_os_str().is_empty() { |
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128 if path.is_dir() { |
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129 config.add_trusted_dir(&path)? |
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130 } else { |
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131 config.add_trusted_file(&path)? |
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132 } |
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133 } |
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134 } |
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135 } |
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136 if let Some(layer) = ConfigLayer::parse_cli_args(cli_config_args)? { |
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137 config.layers.push(layer) |
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138 } |
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139 Ok(config) |
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140 } |
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141 |
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142 fn add_trusted_dir(&mut self, path: &Path) -> Result<(), ConfigError> { |
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143 if let Some(entries) = std::fs::read_dir(path) |
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144 .when_reading_file(path) |
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145 .io_not_found_as_none()? |
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146 { |
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147 let mut file_paths = entries |
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148 .map(|result| { |
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149 result.when_reading_file(path).map(|entry| entry.path()) |
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150 }) |
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151 .collect::<Result<Vec<_>, _>>()?; |
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152 file_paths.sort(); |
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153 for file_path in &file_paths { |
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154 if file_path.extension() == Some(std::ffi::OsStr::new("rc")) { |
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155 self.add_trusted_file(&file_path)? |
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156 } |
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157 } |
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158 } |
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159 Ok(()) |
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160 } |
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161 |
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162 fn add_trusted_file(&mut self, path: &Path) -> Result<(), ConfigError> { |
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163 if let Some(data) = std::fs::read(path) |
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164 .when_reading_file(path) |
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165 .io_not_found_as_none()? |
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166 { |
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167 self.layers.extend(ConfigLayer::parse(path, &data)?) |
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168 } |
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169 Ok(()) |
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170 } |
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171 |
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172 fn add_for_environment_variable( |
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173 &mut self, |
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174 var: &str, |
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175 section: &[u8], |
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176 key: &[u8], |
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177 ) { |
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178 if let Some(value) = env::var_os(var) { |
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179 let origin = layer::ConfigOrigin::Environment(var.into()); |
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180 let mut layer = ConfigLayer::new(origin); |
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181 layer.add( |
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182 section.to_owned(), |
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183 key.to_owned(), |
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184 get_bytes_from_os_str(value), |
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185 None, |
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186 ); |
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187 self.layers.push(layer) |
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188 } |
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189 } |
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190 |
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191 #[cfg(unix)] // TODO: other platforms |
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192 fn add_system_config(&mut self) -> Result<(), ConfigError> { |
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193 let mut add_for_prefix = |prefix: &Path| -> Result<(), ConfigError> { |
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194 let etc = prefix.join("etc").join("mercurial"); |
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195 self.add_trusted_file(&etc.join("hgrc"))?; |
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196 self.add_trusted_dir(&etc.join("hgrc.d")) |
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197 }; |
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198 let root = Path::new("/"); |
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199 // TODO: use `std::env::args_os().next().unwrap()` a.k.a. argv[0] |
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200 // instead? TODO: can this be a relative path? |
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201 let hg = crate::utils::current_exe()?; |
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202 // TODO: this order (per-installation then per-system) matches |
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203 // `systemrcpath()` in `mercurial/scmposix.py`, but |
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204 // `mercurial/helptext/config.txt` suggests it should be reversed |
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205 if let Some(installation_prefix) = hg.parent().and_then(Path::parent) { |
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206 if installation_prefix != root { |
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207 add_for_prefix(&installation_prefix)? |
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208 } |
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209 } |
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210 add_for_prefix(root)?; |
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211 Ok(()) |
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212 } |
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213 |
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214 #[cfg(unix)] // TODO: other plateforms |
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215 fn add_user_config(&mut self) -> Result<(), ConfigError> { |
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216 let opt_home = home::home_dir(); |
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217 if let Some(home) = &opt_home { |
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218 self.add_trusted_file(&home.join(".hgrc"))? |
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219 } |
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220 let darwin = cfg!(any(target_os = "macos", target_os = "ios")); |
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221 if !darwin { |
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222 if let Some(config_home) = env::var_os("XDG_CONFIG_HOME") |
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223 .map(PathBuf::from) |
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224 .or_else(|| opt_home.map(|home| home.join(".config"))) |
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225 { |
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226 self.add_trusted_file(&config_home.join("hg").join("hgrc"))? |
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227 } |
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228 } |
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229 Ok(()) |
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230 } |
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231 |
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232 /// Loads in order, which means that the precedence is the same |
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233 /// as the order of `sources`. |
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234 pub fn load_from_explicit_sources( |
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235 sources: Vec<ConfigSource>, |
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236 ) -> Result<Self, ConfigError> { |
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237 let mut layers = vec![]; |
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238 |
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239 for source in sources.into_iter() { |
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240 match source { |
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241 ConfigSource::Parsed(c) => layers.push(c), |
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242 ConfigSource::AbsPath(c) => { |
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243 // TODO check if it should be trusted |
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244 // mercurial/ui.py:427 |
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245 let data = match std::fs::read(&c) { |
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246 Err(_) => continue, // same as the python code |
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247 Ok(data) => data, |
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248 }; |
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249 layers.extend(ConfigLayer::parse(&c, &data)?) |
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250 } |
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251 } |
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252 } |
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253 |
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254 Ok(Config { layers }) |
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255 } |
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256 |
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257 /// Loads the per-repository config into a new `Config` which is combined |
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258 /// with `self`. |
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259 pub(crate) fn combine_with_repo( |
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260 &self, |
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261 repo_config_files: &[PathBuf], |
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262 ) -> Result<Self, ConfigError> { |
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263 let (cli_layers, other_layers) = self |
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264 .layers |
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265 .iter() |
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266 .cloned() |
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267 .partition(ConfigLayer::is_from_command_line); |
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268 |
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269 let mut repo_config = Self { |
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270 layers: other_layers, |
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271 }; |
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272 for path in repo_config_files { |
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273 // TODO: check if this file should be trusted: |
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274 // `mercurial/ui.py:427` |
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275 repo_config.add_trusted_file(path)?; |
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276 } |
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277 repo_config.layers.extend(cli_layers); |
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278 Ok(repo_config) |
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279 } |
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280 |
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281 fn get_parse<'config, T: 'config>( |
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282 &'config self, |
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283 section: &[u8], |
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284 item: &[u8], |
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285 expected_type: &'static str, |
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286 parse: impl Fn(&'config [u8]) -> Option<T>, |
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287 ) -> Result<Option<T>, ConfigValueParseError> { |
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288 match self.get_inner(§ion, &item) { |
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289 Some((layer, v)) => match parse(&v.bytes) { |
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290 Some(b) => Ok(Some(b)), |
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291 None => Err(ConfigValueParseError { |
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292 origin: layer.origin.to_owned(), |
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293 line: v.line, |
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294 value: v.bytes.to_owned(), |
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295 section: section.to_owned(), |
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296 item: item.to_owned(), |
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297 expected_type, |
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298 }), |
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299 }, |
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300 None => Ok(None), |
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301 } |
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302 } |
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303 |
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304 /// Returns an `Err` if the first value found is not a valid UTF-8 string. |
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305 /// Otherwise, returns an `Ok(value)` if found, or `None`. |
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306 pub fn get_str( |
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307 &self, |
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308 section: &[u8], |
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309 item: &[u8], |
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310 ) -> Result<Option<&str>, ConfigValueParseError> { |
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311 self.get_parse(section, item, "ASCII or UTF-8 string", |value| { |
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312 str::from_utf8(value).ok() |
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313 }) |
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314 } |
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315 |
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316 /// Returns an `Err` if the first value found is not a valid unsigned |
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317 /// integer. Otherwise, returns an `Ok(value)` if found, or `None`. |
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318 pub fn get_u32( |
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319 &self, |
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320 section: &[u8], |
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321 item: &[u8], |
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322 ) -> Result<Option<u32>, ConfigValueParseError> { |
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323 self.get_parse(section, item, "valid integer", |value| { |
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324 str::from_utf8(value).ok()?.parse().ok() |
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325 }) |
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326 } |
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327 |
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328 /// Returns an `Err` if the first value found is not a valid file size |
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329 /// value such as `30` (default unit is bytes), `7 MB`, or `42.5 kb`. |
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330 /// Otherwise, returns an `Ok(value_in_bytes)` if found, or `None`. |
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331 pub fn get_byte_size( |
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332 &self, |
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333 section: &[u8], |
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334 item: &[u8], |
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335 ) -> Result<Option<u64>, ConfigValueParseError> { |
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336 self.get_parse(section, item, "byte quantity", values::parse_byte_size) |
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337 } |
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338 |
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339 /// Returns an `Err` if the first value found is not a valid boolean. |
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340 /// Otherwise, returns an `Ok(option)`, where `option` is the boolean if |
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341 /// found, or `None`. |
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342 pub fn get_option( |
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343 &self, |
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344 section: &[u8], |
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345 item: &[u8], |
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346 ) -> Result<Option<bool>, ConfigValueParseError> { |
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347 self.get_parse(section, item, "boolean", values::parse_bool) |
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348 } |
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349 |
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350 /// Returns the corresponding boolean in the config. Returns `Ok(false)` |
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351 /// if the value is not found, an `Err` if it's not a valid boolean. |
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352 pub fn get_bool( |
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353 &self, |
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354 section: &[u8], |
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355 item: &[u8], |
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356 ) -> Result<bool, ConfigValueParseError> { |
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357 Ok(self.get_option(section, item)?.unwrap_or(false)) |
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358 } |
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359 |
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360 /// Returns the corresponding list-value in the config if found, or `None`. |
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361 /// |
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362 /// This is appropriate for new configuration keys. The value syntax is |
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363 /// **not** the same as most existing list-valued config, which has Python |
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364 /// parsing implemented in `parselist()` in `mercurial/config.py`. |
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365 /// Faithfully porting that parsing algorithm to Rust (including behavior |
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366 /// that are arguably bugs) turned out to be non-trivial and hasn’t been |
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367 /// completed as of this writing. |
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368 /// |
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369 /// Instead, the "simple" syntax is: split on comma, then trim leading and |
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370 /// trailing whitespace of each component. Quotes or backslashes are not |
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371 /// interpreted in any way. Commas are mandatory between values. Values |
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372 /// that contain a comma are not supported. |
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373 pub fn get_simple_list( |
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374 &self, |
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375 section: &[u8], |
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376 item: &[u8], |
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377 ) -> Option<impl Iterator<Item = &[u8]>> { |
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378 self.get(section, item).map(|value| { |
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379 value |
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380 .split(|&byte| byte == b',') |
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381 .map(|component| component.trim()) |
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382 }) |
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383 } |
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384 |
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385 /// Returns the raw value bytes of the first one found, or `None`. |
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386 pub fn get(&self, section: &[u8], item: &[u8]) -> Option<&[u8]> { |
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387 self.get_inner(section, item) |
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388 .map(|(_, value)| value.bytes.as_ref()) |
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389 } |
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390 |
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391 /// Returns the layer and the value of the first one found, or `None`. |
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392 fn get_inner( |
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393 &self, |
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394 section: &[u8], |
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395 item: &[u8], |
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396 ) -> Option<(&ConfigLayer, &ConfigValue)> { |
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397 for layer in self.layers.iter().rev() { |
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398 if !layer.trusted { |
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399 continue; |
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400 } |
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401 if let Some(v) = layer.get(§ion, &item) { |
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402 return Some((&layer, v)); |
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403 } |
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404 } |
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405 None |
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406 } |
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407 |
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408 /// Return all keys defined for the given section |
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409 pub fn get_section_keys(&self, section: &[u8]) -> HashSet<&[u8]> { |
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410 self.layers |
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411 .iter() |
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412 .flat_map(|layer| layer.iter_keys(section)) |
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413 .collect() |
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414 } |
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415 |
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416 /// Get raw values bytes from all layers (even untrusted ones) in order |
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417 /// of precedence. |
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418 #[cfg(test)] |
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419 fn get_all(&self, section: &[u8], item: &[u8]) -> Vec<&[u8]> { |
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420 let mut res = vec![]; |
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421 for layer in self.layers.iter().rev() { |
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422 if let Some(v) = layer.get(§ion, &item) { |
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423 res.push(v.bytes.as_ref()); |
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424 } |
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425 } |
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426 res |
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427 } |
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428 } |
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429 |
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430 #[cfg(test)] |
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431 mod tests { |
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432 use super::*; |
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433 use pretty_assertions::assert_eq; |
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434 use std::fs::File; |
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435 use std::io::Write; |
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436 |
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437 #[test] |
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438 fn test_include_layer_ordering() { |
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439 let tmpdir = tempfile::tempdir().unwrap(); |
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440 let tmpdir_path = tmpdir.path(); |
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441 let mut included_file = |
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442 File::create(&tmpdir_path.join("included.rc")).unwrap(); |
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443 |
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444 included_file.write_all(b"[section]\nitem=value1").unwrap(); |
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445 let base_config_path = tmpdir_path.join("base.rc"); |
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446 let mut config_file = File::create(&base_config_path).unwrap(); |
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447 let data = |
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448 b"[section]\nitem=value0\n%include included.rc\nitem=value2\n\ |
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449 [section2]\ncount = 4\nsize = 1.5 KB\nnot-count = 1.5\nnot-size = 1 ub"; |
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450 config_file.write_all(data).unwrap(); |
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451 |
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452 let sources = vec![ConfigSource::AbsPath(base_config_path)]; |
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453 let config = Config::load_from_explicit_sources(sources) |
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454 .expect("expected valid config"); |
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455 |
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456 let (_, value) = config.get_inner(b"section", b"item").unwrap(); |
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457 assert_eq!( |
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458 value, |
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459 &ConfigValue { |
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460 bytes: b"value2".to_vec(), |
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461 line: Some(4) |
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462 } |
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463 ); |
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464 |
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465 let value = config.get(b"section", b"item").unwrap(); |
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466 assert_eq!(value, b"value2",); |
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467 assert_eq!( |
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468 config.get_all(b"section", b"item"), |
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469 [b"value2", b"value1", b"value0"] |
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hg-core: add basic config module
Raphaël Gomès <rgomes@octobus.net>
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470 ); |
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rust: Add config parsing support for more value types
Simon Sapin <simon.sapin@octobus.net>
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471 |
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rust: Add config parsing support for more value types
Simon Sapin <simon.sapin@octobus.net>
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472 assert_eq!(config.get_u32(b"section2", b"count").unwrap(), Some(4)); |
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rust: Add config parsing support for more value types
Simon Sapin <simon.sapin@octobus.net>
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473 assert_eq!( |
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rust: Add config parsing support for more value types
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474 config.get_byte_size(b"section2", b"size").unwrap(), |
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475 Some(1024 + 512) |
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476 ); |
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rust: Add config parsing support for more value types
Simon Sapin <simon.sapin@octobus.net>
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477 assert!(config.get_u32(b"section2", b"not-count").is_err()); |
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478 assert!(config.get_byte_size(b"section2", b"not-size").is_err()); |
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hg-core: add basic config module
Raphaël Gomès <rgomes@octobus.net>
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479 } |
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hg-core: add basic config module
Raphaël Gomès <rgomes@octobus.net>
parents:
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480 } |