Mercurial > hg
annotate rust/hg-core/src/config/config.rs @ 46732:60fe9ebae29b
rhg: Sort config files when adding a directory
For example in `/etc/mercurial/hgrc.d/` or with `HGRCPATH=some-directory`.
Previously files where parsed in the order returned by the filesystem,
which is undefined. But order is significant when multiple files
define the same configuration key: the "last" one wins.
Differential Revision: https://phab.mercurial-scm.org/D10111
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 03 Mar 2021 20:02:07 +0100 |
parents | 08a35cec14d4 |
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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 format_bytes::{write_bytes, DisplayBytes}; |
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17 use std::env; |
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18 use std::path::{Path, PathBuf}; |
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19 use std::str; |
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20 |
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21 use crate::errors::{HgResultExt, IoResultExt}; |
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22 |
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23 /// Holds the config values for the current repository |
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24 /// TODO update this docstring once we support more sources |
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25 pub struct Config { |
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26 layers: Vec<layer::ConfigLayer>, |
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27 } |
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28 |
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29 impl DisplayBytes for Config { |
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30 fn display_bytes( |
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31 &self, |
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32 out: &mut dyn std::io::Write, |
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33 ) -> std::io::Result<()> { |
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34 for (index, layer) in self.layers.iter().rev().enumerate() { |
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35 write_bytes!( |
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36 out, |
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37 b"==== Layer {} (trusted: {}) ====\n{}", |
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38 index, |
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39 if layer.trusted { |
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40 &b"yes"[..] |
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41 } else { |
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42 &b"no"[..] |
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43 }, |
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44 layer |
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45 )?; |
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46 } |
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47 Ok(()) |
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48 } |
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49 } |
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50 |
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51 pub enum ConfigSource { |
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52 /// Absolute path to a config file |
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53 AbsPath(PathBuf), |
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54 /// Already parsed (from the CLI, env, Python resources, etc.) |
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55 Parsed(layer::ConfigLayer), |
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56 } |
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57 |
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58 #[derive(Debug)] |
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59 pub struct ConfigValueParseError { |
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60 pub origin: ConfigOrigin, |
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61 pub line: Option<usize>, |
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62 pub section: Vec<u8>, |
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63 pub item: Vec<u8>, |
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64 pub value: Vec<u8>, |
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65 pub expected_type: &'static str, |
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66 } |
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67 |
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68 impl Config { |
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69 /// Load system and user configuration from various files. |
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70 /// |
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71 /// This is also affected by some environment variables. |
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72 pub fn load( |
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73 cli_config_args: impl IntoIterator<Item = impl AsRef<[u8]>>, |
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74 ) -> Result<Self, ConfigError> { |
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75 let mut config = Self { layers: Vec::new() }; |
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76 let opt_rc_path = env::var_os("HGRCPATH"); |
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77 // HGRCPATH replaces system config |
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78 if opt_rc_path.is_none() { |
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79 config.add_system_config()? |
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80 } |
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81 |
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82 config.add_for_environment_variable("EDITOR", b"ui", b"editor"); |
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83 config.add_for_environment_variable("VISUAL", b"ui", b"editor"); |
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84 config.add_for_environment_variable("PAGER", b"pager", b"pager"); |
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85 |
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86 // These are set by `run-tests.py --rhg` to enable fallback for the |
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87 // entire test suite. Alternatives would be setting configuration |
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88 // through `$HGRCPATH` but some tests override that, or changing the |
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89 // `hg` shell alias to include `--config` but that disrupts tests that |
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90 // print command lines and check expected output. |
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91 config.add_for_environment_variable( |
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92 "RHG_ON_UNSUPPORTED", |
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93 b"rhg", |
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94 b"on-unsupported", |
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95 ); |
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96 config.add_for_environment_variable( |
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97 "RHG_FALLBACK_EXECUTABLE", |
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98 b"rhg", |
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99 b"fallback-executable", |
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100 ); |
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101 |
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102 // HGRCPATH replaces user config |
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103 if opt_rc_path.is_none() { |
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104 config.add_user_config()? |
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105 } |
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106 if let Some(rc_path) = &opt_rc_path { |
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107 for path in env::split_paths(rc_path) { |
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108 if !path.as_os_str().is_empty() { |
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109 if path.is_dir() { |
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110 config.add_trusted_dir(&path)? |
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111 } else { |
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112 config.add_trusted_file(&path)? |
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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 if let Some(layer) = ConfigLayer::parse_cli_args(cli_config_args)? { |
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118 config.layers.push(layer) |
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119 } |
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120 Ok(config) |
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121 } |
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122 |
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123 fn add_trusted_dir(&mut self, path: &Path) -> Result<(), ConfigError> { |
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124 if let Some(entries) = std::fs::read_dir(path) |
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125 .when_reading_file(path) |
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126 .io_not_found_as_none()? |
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127 { |
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128 let mut file_paths = entries |
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129 .map(|result| { |
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130 result.when_reading_file(path).map(|entry| entry.path()) |
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131 }) |
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132 .collect::<Result<Vec<_>, _>>()?; |
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133 file_paths.sort(); |
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134 for file_path in &file_paths { |
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135 if file_path.extension() == Some(std::ffi::OsStr::new("rc")) { |
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136 self.add_trusted_file(&file_path)? |
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137 } |
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138 } |
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139 } |
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140 Ok(()) |
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141 } |
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142 |
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143 fn add_trusted_file(&mut self, path: &Path) -> Result<(), ConfigError> { |
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144 if let Some(data) = std::fs::read(path) |
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145 .when_reading_file(path) |
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146 .io_not_found_as_none()? |
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147 { |
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148 self.layers.extend(ConfigLayer::parse(path, &data)?) |
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149 } |
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150 Ok(()) |
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151 } |
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152 |
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153 fn add_for_environment_variable( |
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154 &mut self, |
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155 var: &str, |
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156 section: &[u8], |
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157 key: &[u8], |
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158 ) { |
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159 if let Some(value) = env::var_os(var) { |
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160 let origin = layer::ConfigOrigin::Environment(var.into()); |
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161 let mut layer = ConfigLayer::new(origin); |
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162 layer.add( |
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163 section.to_owned(), |
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164 key.to_owned(), |
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165 get_bytes_from_os_str(value), |
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166 None, |
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167 ); |
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168 self.layers.push(layer) |
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169 } |
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170 } |
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171 |
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172 #[cfg(unix)] // TODO: other platforms |
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173 fn add_system_config(&mut self) -> Result<(), ConfigError> { |
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174 let mut add_for_prefix = |prefix: &Path| -> Result<(), ConfigError> { |
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175 let etc = prefix.join("etc").join("mercurial"); |
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176 self.add_trusted_file(&etc.join("hgrc"))?; |
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177 self.add_trusted_dir(&etc.join("hgrc.d")) |
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178 }; |
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179 let root = Path::new("/"); |
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180 // TODO: use `std::env::args_os().next().unwrap()` a.k.a. argv[0] |
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181 // instead? TODO: can this be a relative path? |
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182 let hg = crate::utils::current_exe()?; |
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183 // TODO: this order (per-installation then per-system) matches |
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184 // `systemrcpath()` in `mercurial/scmposix.py`, but |
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185 // `mercurial/helptext/config.txt` suggests it should be reversed |
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186 if let Some(installation_prefix) = hg.parent().and_then(Path::parent) { |
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187 if installation_prefix != root { |
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188 add_for_prefix(&installation_prefix)? |
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189 } |
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190 } |
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191 add_for_prefix(root)?; |
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192 Ok(()) |
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193 } |
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194 |
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195 #[cfg(unix)] // TODO: other plateforms |
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196 fn add_user_config(&mut self) -> Result<(), ConfigError> { |
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197 let opt_home = home::home_dir(); |
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198 if let Some(home) = &opt_home { |
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199 self.add_trusted_file(&home.join(".hgrc"))? |
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200 } |
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201 let darwin = cfg!(any(target_os = "macos", target_os = "ios")); |
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202 if !darwin { |
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203 if let Some(config_home) = env::var_os("XDG_CONFIG_HOME") |
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204 .map(PathBuf::from) |
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205 .or_else(|| opt_home.map(|home| home.join(".config"))) |
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206 { |
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207 self.add_trusted_file(&config_home.join("hg").join("hgrc"))? |
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208 } |
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209 } |
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210 Ok(()) |
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211 } |
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212 |
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213 /// Loads in order, which means that the precedence is the same |
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214 /// as the order of `sources`. |
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215 pub fn load_from_explicit_sources( |
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216 sources: Vec<ConfigSource>, |
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217 ) -> Result<Self, ConfigError> { |
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218 let mut layers = vec![]; |
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219 |
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220 for source in sources.into_iter() { |
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221 match source { |
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222 ConfigSource::Parsed(c) => layers.push(c), |
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223 ConfigSource::AbsPath(c) => { |
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224 // TODO check if it should be trusted |
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225 // mercurial/ui.py:427 |
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226 let data = match std::fs::read(&c) { |
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227 Err(_) => continue, // same as the python code |
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228 Ok(data) => data, |
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229 }; |
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230 layers.extend(ConfigLayer::parse(&c, &data)?) |
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231 } |
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232 } |
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233 } |
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234 |
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235 Ok(Config { layers }) |
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236 } |
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237 |
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238 /// Loads the per-repository config into a new `Config` which is combined |
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239 /// with `self`. |
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240 pub(crate) fn combine_with_repo( |
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241 &self, |
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242 repo_config_files: &[PathBuf], |
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243 ) -> Result<Self, ConfigError> { |
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244 let (cli_layers, other_layers) = self |
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245 .layers |
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246 .iter() |
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247 .cloned() |
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248 .partition(ConfigLayer::is_from_command_line); |
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249 |
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250 let mut repo_config = Self { |
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251 layers: other_layers, |
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252 }; |
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253 for path in repo_config_files { |
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254 // TODO: check if this file should be trusted: |
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255 // `mercurial/ui.py:427` |
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256 repo_config.add_trusted_file(path)?; |
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257 } |
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258 repo_config.layers.extend(cli_layers); |
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259 Ok(repo_config) |
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260 } |
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261 |
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262 fn get_parse<'config, T: 'config>( |
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263 &'config self, |
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264 section: &[u8], |
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265 item: &[u8], |
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266 expected_type: &'static str, |
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267 parse: impl Fn(&'config [u8]) -> Option<T>, |
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268 ) -> Result<Option<T>, ConfigValueParseError> { |
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269 match self.get_inner(§ion, &item) { |
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270 Some((layer, v)) => match parse(&v.bytes) { |
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271 Some(b) => Ok(Some(b)), |
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272 None => Err(ConfigValueParseError { |
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273 origin: layer.origin.to_owned(), |
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274 line: v.line, |
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275 value: v.bytes.to_owned(), |
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276 section: section.to_owned(), |
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277 item: item.to_owned(), |
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278 expected_type, |
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279 }), |
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280 }, |
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281 None => Ok(None), |
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282 } |
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283 } |
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284 |
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285 /// Returns an `Err` if the first value found is not a valid UTF-8 string. |
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286 /// Otherwise, returns an `Ok(value)` if found, or `None`. |
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287 pub fn get_str( |
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288 &self, |
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289 section: &[u8], |
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290 item: &[u8], |
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291 ) -> Result<Option<&str>, ConfigValueParseError> { |
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292 self.get_parse(section, item, "ASCII or UTF-8 string", |value| { |
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293 str::from_utf8(value).ok() |
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294 }) |
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295 } |
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296 |
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297 /// Returns an `Err` if the first value found is not a valid unsigned |
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298 /// integer. Otherwise, returns an `Ok(value)` if found, or `None`. |
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299 pub fn get_u32( |
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300 &self, |
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301 section: &[u8], |
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302 item: &[u8], |
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303 ) -> Result<Option<u32>, ConfigValueParseError> { |
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304 self.get_parse(section, item, "valid integer", |value| { |
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305 str::from_utf8(value).ok()?.parse().ok() |
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306 }) |
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307 } |
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308 |
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309 /// Returns an `Err` if the first value found is not a valid file size |
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310 /// value such as `30` (default unit is bytes), `7 MB`, or `42.5 kb`. |
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311 /// Otherwise, returns an `Ok(value_in_bytes)` if found, or `None`. |
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312 pub fn get_byte_size( |
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313 &self, |
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314 section: &[u8], |
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315 item: &[u8], |
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316 ) -> Result<Option<u64>, ConfigValueParseError> { |
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317 self.get_parse(section, item, "byte quantity", values::parse_byte_size) |
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318 } |
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319 |
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320 /// Returns an `Err` if the first value found is not a valid boolean. |
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321 /// Otherwise, returns an `Ok(option)`, where `option` is the boolean if |
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322 /// found, or `None`. |
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323 pub fn get_option( |
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324 &self, |
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325 section: &[u8], |
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326 item: &[u8], |
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327 ) -> Result<Option<bool>, ConfigValueParseError> { |
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328 self.get_parse(section, item, "boolean", values::parse_bool) |
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329 } |
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330 |
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331 /// Returns the corresponding boolean in the config. Returns `Ok(false)` |
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332 /// if the value is not found, an `Err` if it's not a valid boolean. |
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333 pub fn get_bool( |
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334 &self, |
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335 section: &[u8], |
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336 item: &[u8], |
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337 ) -> Result<bool, ConfigValueParseError> { |
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338 Ok(self.get_option(section, item)?.unwrap_or(false)) |
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339 } |
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340 |
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341 /// Returns the raw value bytes of the first one found, or `None`. |
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342 pub fn get(&self, section: &[u8], item: &[u8]) -> Option<&[u8]> { |
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343 self.get_inner(section, item) |
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344 .map(|(_, value)| value.bytes.as_ref()) |
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345 } |
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346 |
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347 /// Returns the layer and the value of the first one found, or `None`. |
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348 fn get_inner( |
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349 &self, |
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350 section: &[u8], |
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351 item: &[u8], |
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352 ) -> Option<(&ConfigLayer, &ConfigValue)> { |
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353 for layer in self.layers.iter().rev() { |
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354 if !layer.trusted { |
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355 continue; |
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356 } |
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357 if let Some(v) = layer.get(§ion, &item) { |
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358 return Some((&layer, v)); |
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359 } |
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360 } |
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361 None |
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362 } |
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363 |
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364 /// Get raw values bytes from all layers (even untrusted ones) in order |
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365 /// of precedence. |
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366 #[cfg(test)] |
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367 fn get_all(&self, section: &[u8], item: &[u8]) -> Vec<&[u8]> { |
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368 let mut res = vec![]; |
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369 for layer in self.layers.iter().rev() { |
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370 if let Some(v) = layer.get(§ion, &item) { |
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371 res.push(v.bytes.as_ref()); |
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372 } |
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373 } |
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374 res |
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375 } |
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376 } |
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377 |
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378 #[cfg(test)] |
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379 mod tests { |
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380 use super::*; |
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381 use pretty_assertions::assert_eq; |
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382 use std::fs::File; |
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383 use std::io::Write; |
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384 |
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385 #[test] |
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386 fn test_include_layer_ordering() { |
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387 let tmpdir = tempfile::tempdir().unwrap(); |
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388 let tmpdir_path = tmpdir.path(); |
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389 let mut included_file = |
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390 File::create(&tmpdir_path.join("included.rc")).unwrap(); |
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391 |
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392 included_file.write_all(b"[section]\nitem=value1").unwrap(); |
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393 let base_config_path = tmpdir_path.join("base.rc"); |
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394 let mut config_file = File::create(&base_config_path).unwrap(); |
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395 let data = |
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396 b"[section]\nitem=value0\n%include included.rc\nitem=value2\n\ |
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397 [section2]\ncount = 4\nsize = 1.5 KB\nnot-count = 1.5\nnot-size = 1 ub"; |
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398 config_file.write_all(data).unwrap(); |
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399 |
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400 let sources = vec![ConfigSource::AbsPath(base_config_path)]; |
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401 let config = Config::load_from_explicit_sources(sources) |
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402 .expect("expected valid config"); |
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403 |
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404 let (_, value) = config.get_inner(b"section", b"item").unwrap(); |
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405 assert_eq!( |
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406 value, |
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407 &ConfigValue { |
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408 bytes: b"value2".to_vec(), |
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409 line: Some(4) |
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410 } |
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411 ); |
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412 |
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413 let value = config.get(b"section", b"item").unwrap(); |
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414 assert_eq!(value, b"value2",); |
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415 assert_eq!( |
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416 config.get_all(b"section", b"item"), |
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417 [b"value2", b"value1", b"value0"] |
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418 ); |
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419 |
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420 assert_eq!(config.get_u32(b"section2", b"count").unwrap(), Some(4)); |
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421 assert_eq!( |
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422 config.get_byte_size(b"section2", b"size").unwrap(), |
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423 Some(1024 + 512) |
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424 ); |
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425 assert!(config.get_u32(b"section2", b"not-count").is_err()); |
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426 assert!(config.get_byte_size(b"section2", b"not-size").is_err()); |
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427 } |
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428 } |