Mercurial > hg
annotate rust/hg-core/src/config/config.rs @ 46722:08a35cec14d4
rhg: Add environment variables for fallback configuration
For the `rust-tests.py --rhg` we want every `hg` command in tests
to run `rhg` with fallback enabled, but other methods of setting
configuration are limited or disruptive as discussed in code comment.
Differential Revision: https://phab.mercurial-scm.org/D10186
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 12 Mar 2021 18:45:32 +0100 |
parents | a687a7f27951 |
children | 60fe9ebae29b |
rev | line source |
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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 for entry in entries { |
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129 let file_path = entry.when_reading_file(path)?.path(); |
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130 if file_path.extension() == Some(std::ffi::OsStr::new("rc")) { |
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131 self.add_trusted_file(&file_path)? |
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132 } |
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133 } |
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134 } |
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135 Ok(()) |
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136 } |
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137 |
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138 fn add_trusted_file(&mut self, path: &Path) -> Result<(), ConfigError> { |
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139 if let Some(data) = std::fs::read(path) |
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140 .when_reading_file(path) |
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141 .io_not_found_as_none()? |
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142 { |
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143 self.layers.extend(ConfigLayer::parse(path, &data)?) |
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144 } |
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145 Ok(()) |
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146 } |
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147 |
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148 fn add_for_environment_variable( |
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149 &mut self, |
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150 var: &str, |
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151 section: &[u8], |
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152 key: &[u8], |
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153 ) { |
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154 if let Some(value) = env::var_os(var) { |
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155 let origin = layer::ConfigOrigin::Environment(var.into()); |
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156 let mut layer = ConfigLayer::new(origin); |
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157 layer.add( |
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158 section.to_owned(), |
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159 key.to_owned(), |
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160 get_bytes_from_os_str(value), |
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161 None, |
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162 ); |
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163 self.layers.push(layer) |
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164 } |
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165 } |
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166 |
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167 #[cfg(unix)] // TODO: other platforms |
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168 fn add_system_config(&mut self) -> Result<(), ConfigError> { |
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169 let mut add_for_prefix = |prefix: &Path| -> Result<(), ConfigError> { |
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170 let etc = prefix.join("etc").join("mercurial"); |
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171 self.add_trusted_file(&etc.join("hgrc"))?; |
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172 self.add_trusted_dir(&etc.join("hgrc.d")) |
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173 }; |
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174 let root = Path::new("/"); |
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175 // TODO: use `std::env::args_os().next().unwrap()` a.k.a. argv[0] |
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176 // instead? TODO: can this be a relative path? |
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177 let hg = crate::utils::current_exe()?; |
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178 // TODO: this order (per-installation then per-system) matches |
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179 // `systemrcpath()` in `mercurial/scmposix.py`, but |
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180 // `mercurial/helptext/config.txt` suggests it should be reversed |
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181 if let Some(installation_prefix) = hg.parent().and_then(Path::parent) { |
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182 if installation_prefix != root { |
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183 add_for_prefix(&installation_prefix)? |
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184 } |
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185 } |
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186 add_for_prefix(root)?; |
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187 Ok(()) |
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188 } |
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189 |
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190 #[cfg(unix)] // TODO: other plateforms |
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191 fn add_user_config(&mut self) -> Result<(), ConfigError> { |
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192 let opt_home = home::home_dir(); |
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193 if let Some(home) = &opt_home { |
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194 self.add_trusted_file(&home.join(".hgrc"))? |
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195 } |
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196 let darwin = cfg!(any(target_os = "macos", target_os = "ios")); |
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197 if !darwin { |
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198 if let Some(config_home) = env::var_os("XDG_CONFIG_HOME") |
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199 .map(PathBuf::from) |
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200 .or_else(|| opt_home.map(|home| home.join(".config"))) |
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201 { |
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202 self.add_trusted_file(&config_home.join("hg").join("hgrc"))? |
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203 } |
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204 } |
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205 Ok(()) |
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206 } |
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207 |
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208 /// Loads in order, which means that the precedence is the same |
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209 /// as the order of `sources`. |
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210 pub fn load_from_explicit_sources( |
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211 sources: Vec<ConfigSource>, |
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212 ) -> Result<Self, ConfigError> { |
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213 let mut layers = vec![]; |
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214 |
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215 for source in sources.into_iter() { |
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216 match source { |
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217 ConfigSource::Parsed(c) => layers.push(c), |
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218 ConfigSource::AbsPath(c) => { |
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219 // TODO check if it should be trusted |
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220 // mercurial/ui.py:427 |
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221 let data = match std::fs::read(&c) { |
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222 Err(_) => continue, // same as the python code |
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223 Ok(data) => data, |
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224 }; |
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225 layers.extend(ConfigLayer::parse(&c, &data)?) |
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226 } |
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227 } |
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228 } |
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229 |
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230 Ok(Config { layers }) |
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231 } |
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232 |
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233 /// Loads the per-repository config into a new `Config` which is combined |
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234 /// with `self`. |
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235 pub(crate) fn combine_with_repo( |
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236 &self, |
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237 repo_config_files: &[PathBuf], |
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238 ) -> Result<Self, ConfigError> { |
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239 let (cli_layers, other_layers) = self |
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240 .layers |
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241 .iter() |
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242 .cloned() |
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243 .partition(ConfigLayer::is_from_command_line); |
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244 |
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245 let mut repo_config = Self { |
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246 layers: other_layers, |
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247 }; |
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248 for path in repo_config_files { |
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249 // TODO: check if this file should be trusted: |
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250 // `mercurial/ui.py:427` |
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251 repo_config.add_trusted_file(path)?; |
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252 } |
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253 repo_config.layers.extend(cli_layers); |
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254 Ok(repo_config) |
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255 } |
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256 |
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257 fn get_parse<'config, T: 'config>( |
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258 &'config self, |
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259 section: &[u8], |
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260 item: &[u8], |
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261 expected_type: &'static str, |
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262 parse: impl Fn(&'config [u8]) -> Option<T>, |
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263 ) -> Result<Option<T>, ConfigValueParseError> { |
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264 match self.get_inner(§ion, &item) { |
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265 Some((layer, v)) => match parse(&v.bytes) { |
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266 Some(b) => Ok(Some(b)), |
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267 None => Err(ConfigValueParseError { |
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268 origin: layer.origin.to_owned(), |
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269 line: v.line, |
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270 value: v.bytes.to_owned(), |
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271 section: section.to_owned(), |
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272 item: item.to_owned(), |
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273 expected_type, |
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274 }), |
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275 }, |
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276 None => Ok(None), |
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277 } |
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278 } |
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279 |
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280 /// Returns an `Err` if the first value found is not a valid UTF-8 string. |
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281 /// Otherwise, returns an `Ok(value)` if found, or `None`. |
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282 pub fn get_str( |
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283 &self, |
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284 section: &[u8], |
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285 item: &[u8], |
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286 ) -> Result<Option<&str>, ConfigValueParseError> { |
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287 self.get_parse(section, item, "ASCII or UTF-8 string", |value| { |
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288 str::from_utf8(value).ok() |
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289 }) |
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290 } |
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291 |
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292 /// Returns an `Err` if the first value found is not a valid unsigned |
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293 /// integer. Otherwise, returns an `Ok(value)` if found, or `None`. |
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294 pub fn get_u32( |
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295 &self, |
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296 section: &[u8], |
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297 item: &[u8], |
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298 ) -> Result<Option<u32>, ConfigValueParseError> { |
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299 self.get_parse(section, item, "valid integer", |value| { |
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300 str::from_utf8(value).ok()?.parse().ok() |
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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 file size |
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305 /// value such as `30` (default unit is bytes), `7 MB`, or `42.5 kb`. |
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306 /// Otherwise, returns an `Ok(value_in_bytes)` if found, or `None`. |
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307 pub fn get_byte_size( |
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308 &self, |
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309 section: &[u8], |
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310 item: &[u8], |
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311 ) -> Result<Option<u64>, ConfigValueParseError> { |
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312 self.get_parse(section, item, "byte quantity", values::parse_byte_size) |
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313 } |
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314 |
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315 /// Returns an `Err` if the first value found is not a valid boolean. |
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316 /// Otherwise, returns an `Ok(option)`, where `option` is the boolean if |
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317 /// found, or `None`. |
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318 pub fn get_option( |
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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<bool>, ConfigValueParseError> { |
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323 self.get_parse(section, item, "boolean", values::parse_bool) |
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324 } |
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325 |
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326 /// Returns the corresponding boolean in the config. Returns `Ok(false)` |
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327 /// if the value is not found, an `Err` if it's not a valid boolean. |
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328 pub fn get_bool( |
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329 &self, |
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330 section: &[u8], |
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331 item: &[u8], |
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332 ) -> Result<bool, ConfigValueParseError> { |
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333 Ok(self.get_option(section, item)?.unwrap_or(false)) |
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334 } |
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335 |
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336 /// Returns the raw value bytes of the first one found, or `None`. |
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337 pub fn get(&self, section: &[u8], item: &[u8]) -> Option<&[u8]> { |
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338 self.get_inner(section, item) |
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339 .map(|(_, value)| value.bytes.as_ref()) |
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340 } |
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341 |
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342 /// Returns the layer and the value of the first one found, or `None`. |
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343 fn get_inner( |
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344 &self, |
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345 section: &[u8], |
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346 item: &[u8], |
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347 ) -> Option<(&ConfigLayer, &ConfigValue)> { |
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348 for layer in self.layers.iter().rev() { |
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349 if !layer.trusted { |
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350 continue; |
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351 } |
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352 if let Some(v) = layer.get(§ion, &item) { |
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353 return Some((&layer, v)); |
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354 } |
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355 } |
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356 None |
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357 } |
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358 |
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359 /// Get raw values bytes from all layers (even untrusted ones) in order |
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360 /// of precedence. |
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361 #[cfg(test)] |
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362 fn get_all(&self, section: &[u8], item: &[u8]) -> Vec<&[u8]> { |
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363 let mut res = vec![]; |
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364 for layer in self.layers.iter().rev() { |
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365 if let Some(v) = layer.get(§ion, &item) { |
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366 res.push(v.bytes.as_ref()); |
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367 } |
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368 } |
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369 res |
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370 } |
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371 } |
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372 |
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373 #[cfg(test)] |
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374 mod tests { |
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375 use super::*; |
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376 use pretty_assertions::assert_eq; |
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377 use std::fs::File; |
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378 use std::io::Write; |
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379 |
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380 #[test] |
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381 fn test_include_layer_ordering() { |
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382 let tmpdir = tempfile::tempdir().unwrap(); |
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383 let tmpdir_path = tmpdir.path(); |
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384 let mut included_file = |
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385 File::create(&tmpdir_path.join("included.rc")).unwrap(); |
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386 |
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387 included_file.write_all(b"[section]\nitem=value1").unwrap(); |
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388 let base_config_path = tmpdir_path.join("base.rc"); |
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389 let mut config_file = File::create(&base_config_path).unwrap(); |
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390 let data = |
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391 b"[section]\nitem=value0\n%include included.rc\nitem=value2\n\ |
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392 [section2]\ncount = 4\nsize = 1.5 KB\nnot-count = 1.5\nnot-size = 1 ub"; |
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393 config_file.write_all(data).unwrap(); |
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394 |
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395 let sources = vec![ConfigSource::AbsPath(base_config_path)]; |
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396 let config = Config::load_from_explicit_sources(sources) |
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397 .expect("expected valid config"); |
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398 |
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399 let (_, value) = config.get_inner(b"section", b"item").unwrap(); |
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400 assert_eq!( |
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401 value, |
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402 &ConfigValue { |
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403 bytes: b"value2".to_vec(), |
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404 line: Some(4) |
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405 } |
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406 ); |
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407 |
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408 let value = config.get(b"section", b"item").unwrap(); |
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409 assert_eq!(value, b"value2",); |
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410 assert_eq!( |
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411 config.get_all(b"section", b"item"), |
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412 [b"value2", b"value1", b"value0"] |
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413 ); |
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414 |
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415 assert_eq!(config.get_u32(b"section2", b"count").unwrap(), Some(4)); |
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416 assert_eq!( |
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417 config.get_byte_size(b"section2", b"size").unwrap(), |
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418 Some(1024 + 512) |
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419 ); |
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420 assert!(config.get_u32(b"section2", b"not-count").is_err()); |
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421 assert!(config.get_byte_size(b"section2", b"not-size").is_err()); |
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422 } |
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423 } |