author | Simon Sapin <simon.sapin@octobus.net> |
Mon, 08 Feb 2021 23:08:44 +0100 | |
changeset 46504 | 2e5dd18d6dc3 |
parent 46499 | eace48b4a786 |
child 46596 | d2e61f00ee9d |
permissions | -rw-r--r-- |
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// config.rs |
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// |
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// Copyright 2020 |
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// Valentin Gatien-Baron, |
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// Raphaël Gomès <rgomes@octobus.net> |
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// |
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// This software may be used and distributed according to the terms of the |
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// GNU General Public License version 2 or any later version. |
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use super::layer; |
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use crate::config::layer::{ |
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ConfigError, ConfigLayer, ConfigParseError, ConfigValue, |
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}; |
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use crate::utils::files::get_bytes_from_path; |
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use format_bytes::{write_bytes, DisplayBytes}; |
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use std::env; |
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use std::path::{Path, PathBuf}; |
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use crate::errors::{HgResultExt, IoResultExt}; |
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/// Holds the config values for the current repository |
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/// TODO update this docstring once we support more sources |
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pub struct Config { |
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layers: Vec<layer::ConfigLayer>, |
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} |
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impl DisplayBytes for Config { |
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fn display_bytes( |
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&self, |
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out: &mut dyn std::io::Write, |
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) -> std::io::Result<()> { |
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for (index, layer) in self.layers.iter().rev().enumerate() { |
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write_bytes!( |
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out, |
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b"==== Layer {} (trusted: {}) ====\n{}", |
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index, |
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if layer.trusted { |
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&b"yes"[..] |
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} else { |
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&b"no"[..] |
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}, |
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layer |
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)?; |
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} |
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Ok(()) |
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} |
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} |
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pub enum ConfigSource { |
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/// Absolute path to a config file |
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AbsPath(PathBuf), |
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/// Already parsed (from the CLI, env, Python resources, etc.) |
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Parsed(layer::ConfigLayer), |
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} |
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pub fn parse_bool(v: &[u8]) -> Option<bool> { |
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match v.to_ascii_lowercase().as_slice() { |
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b"1" | b"yes" | b"true" | b"on" | b"always" => Some(true), |
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b"0" | b"no" | b"false" | b"off" | b"never" => Some(false), |
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_ => None, |
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} |
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} |
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impl Config { |
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/// Load system and user configuration from various files. |
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/// |
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/// This is also affected by some environment variables. |
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pub fn load( |
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cli_config_args: impl IntoIterator<Item = impl AsRef<[u8]>>, |
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) -> Result<Self, ConfigError> { |
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let mut config = Self { layers: Vec::new() }; |
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let opt_rc_path = env::var_os("HGRCPATH"); |
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// HGRCPATH replaces system config |
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if opt_rc_path.is_none() { |
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config.add_system_config()? |
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} |
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config.add_for_environment_variable("EDITOR", b"ui", b"editor"); |
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config.add_for_environment_variable("VISUAL", b"ui", b"editor"); |
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config.add_for_environment_variable("PAGER", b"pager", b"pager"); |
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// HGRCPATH replaces user config |
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if opt_rc_path.is_none() { |
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config.add_user_config()? |
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} |
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if let Some(rc_path) = &opt_rc_path { |
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for path in env::split_paths(rc_path) { |
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if !path.as_os_str().is_empty() { |
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if path.is_dir() { |
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config.add_trusted_dir(&path)? |
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} else { |
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config.add_trusted_file(&path)? |
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} |
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} |
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} |
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} |
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if let Some(layer) = ConfigLayer::parse_cli_args(cli_config_args)? { |
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config.layers.push(layer) |
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} |
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Ok(config) |
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} |
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fn add_trusted_dir(&mut self, path: &Path) -> Result<(), ConfigError> { |
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if let Some(entries) = std::fs::read_dir(path) |
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.for_file(path) |
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.io_not_found_as_none()? |
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{ |
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for entry in entries { |
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let file_path = entry.for_file(path)?.path(); |
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if file_path.extension() == Some(std::ffi::OsStr::new("rc")) { |
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self.add_trusted_file(&file_path)? |
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} |
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} |
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} |
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Ok(()) |
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} |
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|
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fn add_trusted_file(&mut self, path: &Path) -> Result<(), ConfigError> { |
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if let Some(data) = |
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std::fs::read(path).for_file(path).io_not_found_as_none()? |
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{ |
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self.layers.extend(ConfigLayer::parse(path, &data)?) |
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} |
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Ok(()) |
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} |
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124 |
|
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fn add_for_environment_variable( |
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&mut self, |
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var: &str, |
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section: &[u8], |
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key: &[u8], |
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) { |
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if let Some(value) = env::var_os(var) { |
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let origin = layer::ConfigOrigin::Environment(var.into()); |
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let mut layer = ConfigLayer::new(origin); |
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layer.add( |
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section.to_owned(), |
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key.to_owned(), |
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// `value` is not a path but this works for any `OsStr`: |
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get_bytes_from_path(value), |
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None, |
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); |
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self.layers.push(layer) |
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} |
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} |
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144 |
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#[cfg(unix)] // TODO: other platforms |
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fn add_system_config(&mut self) -> Result<(), ConfigError> { |
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let mut add_for_prefix = |prefix: &Path| -> Result<(), ConfigError> { |
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let etc = prefix.join("etc").join("mercurial"); |
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self.add_trusted_file(&etc.join("hgrc"))?; |
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self.add_trusted_dir(&etc.join("hgrc.d")) |
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}; |
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let root = Path::new("/"); |
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// TODO: use `std::env::args_os().next().unwrap()` a.k.a. argv[0] |
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// instead? TODO: can this be a relative path? |
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let hg = crate::utils::current_exe()?; |
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// TODO: this order (per-installation then per-system) matches |
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// `systemrcpath()` in `mercurial/scmposix.py`, but |
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// `mercurial/helptext/config.txt` suggests it should be reversed |
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if let Some(installation_prefix) = hg.parent().and_then(Path::parent) { |
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if installation_prefix != root { |
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add_for_prefix(&installation_prefix)? |
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} |
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} |
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add_for_prefix(root)?; |
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Ok(()) |
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166 |
} |
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167 |
|
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#[cfg(unix)] // TODO: other plateforms |
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fn add_user_config(&mut self) -> Result<(), ConfigError> { |
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let opt_home = home::home_dir(); |
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if let Some(home) = &opt_home { |
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self.add_trusted_file(&home.join(".hgrc"))? |
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} |
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let darwin = cfg!(any(target_os = "macos", target_os = "ios")); |
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if !darwin { |
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if let Some(config_home) = env::var_os("XDG_CONFIG_HOME") |
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.map(PathBuf::from) |
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.or_else(|| opt_home.map(|home| home.join(".config"))) |
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179 |
{ |
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self.add_trusted_file(&config_home.join("hg").join("hgrc"))? |
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} |
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182 |
} |
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183 |
Ok(()) |
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184 |
} |
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185 |
|
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186 |
/// Loads in order, which means that the precedence is the same |
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/// as the order of `sources`. |
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188 |
pub fn load_from_explicit_sources( |
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189 |
sources: Vec<ConfigSource>, |
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190 |
) -> Result<Self, ConfigError> { |
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191 |
let mut layers = vec![]; |
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192 |
|
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193 |
for source in sources.into_iter() { |
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194 |
match source { |
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ConfigSource::Parsed(c) => layers.push(c), |
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196 |
ConfigSource::AbsPath(c) => { |
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197 |
// TODO check if it should be trusted |
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198 |
// mercurial/ui.py:427 |
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199 |
let data = match std::fs::read(&c) { |
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200 |
Err(_) => continue, // same as the python code |
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201 |
Ok(data) => data, |
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202 |
}; |
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203 |
layers.extend(ConfigLayer::parse(&c, &data)?) |
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204 |
} |
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205 |
} |
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206 |
} |
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207 |
|
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208 |
Ok(Config { layers }) |
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209 |
} |
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210 |
|
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211 |
/// Loads the per-repository config into a new `Config` which is combined |
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/// with `self`. |
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213 |
pub(crate) fn combine_with_repo( |
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214 |
&self, |
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215 |
repo_config_files: &[PathBuf], |
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216 |
) -> Result<Self, ConfigError> { |
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217 |
let (cli_layers, other_layers) = self |
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218 |
.layers |
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219 |
.iter() |
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220 |
.cloned() |
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.partition(ConfigLayer::is_from_command_line); |
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222 |
|
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223 |
let mut repo_config = Self { |
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224 |
layers: other_layers, |
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225 |
}; |
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226 |
for path in repo_config_files { |
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227 |
// TODO: check if this file should be trusted: |
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228 |
// `mercurial/ui.py:427` |
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229 |
repo_config.add_trusted_file(path)?; |
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230 |
} |
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repo_config.layers.extend(cli_layers); |
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Ok(repo_config) |
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} |
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|
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/// Returns an `Err` if the first value found is not a valid boolean. |
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/// Otherwise, returns an `Ok(option)`, where `option` is the boolean if |
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/// found, or `None`. |
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pub fn get_option( |
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&self, |
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section: &[u8], |
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item: &[u8], |
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) -> Result<Option<bool>, ConfigParseError> { |
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match self.get_inner(§ion, &item) { |
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Some((layer, v)) => match parse_bool(&v.bytes) { |
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Some(b) => Ok(Some(b)), |
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None => Err(ConfigParseError { |
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origin: layer.origin.to_owned(), |
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line: v.line, |
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bytes: v.bytes.to_owned(), |
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}), |
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}, |
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None => Ok(None), |
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} |
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} |
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255 |
|
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/// Returns the corresponding boolean in the config. Returns `Ok(false)` |
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/// if the value is not found, an `Err` if it's not a valid boolean. |
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pub fn get_bool( |
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&self, |
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section: &[u8], |
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item: &[u8], |
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) -> Result<bool, ConfigError> { |
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Ok(self.get_option(section, item)?.unwrap_or(false)) |
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} |
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|
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/// Returns the raw value bytes of the first one found, or `None`. |
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pub fn get(&self, section: &[u8], item: &[u8]) -> Option<&[u8]> { |
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self.get_inner(section, item) |
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.map(|(_, value)| value.bytes.as_ref()) |
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} |
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|
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/// Returns the layer and the value of the first one found, or `None`. |
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fn get_inner( |
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&self, |
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section: &[u8], |
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item: &[u8], |
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) -> Option<(&ConfigLayer, &ConfigValue)> { |
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for layer in self.layers.iter().rev() { |
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279 |
if !layer.trusted { |
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280 |
continue; |
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281 |
} |
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282 |
if let Some(v) = layer.get(§ion, &item) { |
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return Some((&layer, v)); |
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284 |
} |
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285 |
} |
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286 |
None |
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287 |
} |
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288 |
|
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289 |
/// Get raw values bytes from all layers (even untrusted ones) in order |
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290 |
/// of precedence. |
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291 |
#[cfg(test)] |
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292 |
fn get_all(&self, section: &[u8], item: &[u8]) -> Vec<&[u8]> { |
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293 |
let mut res = vec![]; |
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294 |
for layer in self.layers.iter().rev() { |
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295 |
if let Some(v) = layer.get(§ion, &item) { |
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res.push(v.bytes.as_ref()); |
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297 |
} |
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298 |
} |
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299 |
res |
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300 |
} |
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301 |
} |
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302 |
|
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303 |
#[cfg(test)] |
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304 |
mod tests { |
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305 |
use super::*; |
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306 |
use pretty_assertions::assert_eq; |
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307 |
use std::fs::File; |
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308 |
use std::io::Write; |
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309 |
|
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310 |
#[test] |
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311 |
fn test_include_layer_ordering() { |
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312 |
let tmpdir = tempfile::tempdir().unwrap(); |
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313 |
let tmpdir_path = tmpdir.path(); |
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314 |
let mut included_file = |
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315 |
File::create(&tmpdir_path.join("included.rc")).unwrap(); |
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316 |
|
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317 |
included_file.write_all(b"[section]\nitem=value1").unwrap(); |
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318 |
let base_config_path = tmpdir_path.join("base.rc"); |
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319 |
let mut config_file = File::create(&base_config_path).unwrap(); |
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320 |
let data = |
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321 |
b"[section]\nitem=value0\n%include included.rc\nitem=value2"; |
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322 |
config_file.write_all(data).unwrap(); |
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323 |
|
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324 |
let sources = vec![ConfigSource::AbsPath(base_config_path)]; |
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325 |
let config = Config::load_from_explicit_sources(sources) |
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326 |
.expect("expected valid config"); |
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327 |
|
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328 |
let (_, value) = config.get_inner(b"section", b"item").unwrap(); |
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329 |
assert_eq!( |
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330 |
value, |
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331 |
&ConfigValue { |
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332 |
bytes: b"value2".to_vec(), |
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333 |
line: Some(4) |
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334 |
} |
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335 |
); |
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336 |
|
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337 |
let value = config.get(b"section", b"item").unwrap(); |
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338 |
assert_eq!(value, b"value2",); |
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339 |
assert_eq!( |
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340 |
config.get_all(b"section", b"item"), |
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341 |
[b"value2", b"value1", b"value0"] |
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342 |
); |
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343 |
} |
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344 |
} |