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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 super::values;
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use crate::config::layer::{
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ConfigError, ConfigLayer, ConfigOrigin, ConfigValue,
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};
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use crate::utils::files::get_bytes_from_os_str;
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use format_bytes::{write_bytes, DisplayBytes};
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use std::collections::HashSet;
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use std::env;
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use std::fmt;
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use std::path::{Path, PathBuf};
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use std::str;
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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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#[derive(Clone)]
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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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#[derive(Debug)]
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pub struct ConfigValueParseError {
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pub origin: ConfigOrigin,
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pub line: Option<usize>,
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pub section: Vec<u8>,
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pub item: Vec<u8>,
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pub value: Vec<u8>,
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pub expected_type: &'static str,
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}
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impl fmt::Display for ConfigValueParseError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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// TODO: add origin and line number information, here and in
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// corresponding python code
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write!(
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f,
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"config error: {}.{} is not a {} ('{}')",
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String::from_utf8_lossy(&self.section),
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String::from_utf8_lossy(&self.item),
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self.expected_type,
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String::from_utf8_lossy(&self.value)
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)
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}
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}
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impl Config {
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/// The configuration to use when printing configuration-loading errors
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pub fn empty() -> Self {
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Self { layers: Vec::new() }
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}
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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_non_repo() -> 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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// These are set by `run-tests.py --rhg` to enable fallback for the
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// entire test suite. Alternatives would be setting configuration
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// through `$HGRCPATH` but some tests override that, or changing the
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// `hg` shell alias to include `--config` but that disrupts tests that
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// print command lines and check expected output.
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config.add_for_environment_variable(
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"RHG_ON_UNSUPPORTED",
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b"rhg",
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b"on-unsupported",
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);
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config.add_for_environment_variable(
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"RHG_FALLBACK_EXECUTABLE",
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b"rhg",
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b"fallback-executable",
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);
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config.add_for_environment_variable("RHG_STATUS", b"rhg", b"status");
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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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Ok(config)
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}
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pub fn load_cli_args_config(
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&mut self,
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cli_config_args: impl IntoIterator<Item = impl AsRef<[u8]>>,
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) -> Result<(), ConfigError> {
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if let Some(layer) = ConfigLayer::parse_cli_args(cli_config_args)? {
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self.layers.push(layer)
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}
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Ok(())
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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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.when_reading_file(path)
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.io_not_found_as_none()?
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{
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let mut file_paths = entries
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.map(|result| {
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result.when_reading_file(path).map(|entry| entry.path())
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})
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.collect::<Result<Vec<_>, _>>()?;
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file_paths.sort();
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for file_path in &file_paths {
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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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fn add_trusted_file(&mut self, path: &Path) -> Result<(), ConfigError> {
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if let Some(data) = std::fs::read(path)
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.when_reading_file(path)
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.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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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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get_bytes_from_os_str(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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#[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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}
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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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{
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self.add_trusted_file(&config_home.join("hg").join("hgrc"))?
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}
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}
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Ok(())
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}
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/// Loads in order, which means that the precedence is the same
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/// as the order of `sources`.
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pub fn load_from_explicit_sources(
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sources: Vec<ConfigSource>,
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) -> Result<Self, ConfigError> {
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let mut layers = vec![];
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for source in sources.into_iter() {
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match source {
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ConfigSource::Parsed(c) => layers.push(c),
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ConfigSource::AbsPath(c) => {
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// TODO check if it should be trusted
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// mercurial/ui.py:427
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let data = match std::fs::read(&c) {
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Err(_) => continue, // same as the python code
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Ok(data) => data,
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};
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layers.extend(ConfigLayer::parse(&c, &data)?)
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}
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}
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}
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Ok(Config { layers })
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}
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/// Loads the per-repository config into a new `Config` which is combined
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/// with `self`.
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pub(crate) fn combine_with_repo(
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&self,
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repo_config_files: &[PathBuf],
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) -> Result<Self, ConfigError> {
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let (cli_layers, other_layers) = self
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.layers
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.iter()
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.cloned()
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.partition(ConfigLayer::is_from_command_line);
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let mut repo_config = Self {
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layers: other_layers,
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};
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for path in repo_config_files {
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// TODO: check if this file should be trusted:
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// `mercurial/ui.py:427`
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repo_config.add_trusted_file(path)?;
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}
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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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fn get_parse<'config, T: 'config>(
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&'config self,
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section: &[u8],
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item: &[u8],
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expected_type: &'static str,
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parse: impl Fn(&'config [u8]) -> Option<T>,
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) -> Result<Option<T>, ConfigValueParseError> {
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match self.get_inner(§ion, &item) {
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Some((layer, v)) => match parse(&v.bytes) {
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Some(b) => Ok(Some(b)),
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None => Err(ConfigValueParseError {
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origin: layer.origin.to_owned(),
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line: v.line,
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value: v.bytes.to_owned(),
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section: section.to_owned(),
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item: item.to_owned(),
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expected_type,
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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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/// Returns an `Err` if the first value found is not a valid UTF-8 string.
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/// Otherwise, returns an `Ok(value)` if found, or `None`.
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pub fn get_str(
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&self,
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section: &[u8],
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item: &[u8],
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) -> Result<Option<&str>, ConfigValueParseError> {
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self.get_parse(section, item, "ASCII or UTF-8 string", |value| {
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str::from_utf8(value).ok()
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})
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}
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/// Returns an `Err` if the first value found is not a valid unsigned
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/// integer. Otherwise, returns an `Ok(value)` if found, or `None`.
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pub fn get_u32(
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&self,
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section: &[u8],
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item: &[u8],
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) -> Result<Option<u32>, ConfigValueParseError> {
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self.get_parse(section, item, "valid integer", |value| {
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str::from_utf8(value).ok()?.parse().ok()
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})
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}
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/// Returns an `Err` if the first value found is not a valid file size
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/// value such as `30` (default unit is bytes), `7 MB`, or `42.5 kb`.
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/// Otherwise, returns an `Ok(value_in_bytes)` if found, or `None`.
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pub fn get_byte_size(
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&self,
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section: &[u8],
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item: &[u8],
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) -> Result<Option<u64>, ConfigValueParseError> {
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self.get_parse(section, item, "byte quantity", values::parse_byte_size)
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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>, ConfigValueParseError> {
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self.get_parse(section, item, "boolean", values::parse_bool)
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}
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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, ConfigValueParseError> {
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Ok(self.get_option(section, item)?.unwrap_or(false))
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}
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/// Returns `true` if the extension is enabled, `false` otherwise
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pub fn is_extension_enabled(&self, extension: &[u8]) -> bool {
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let value = self.get(b"extensions", extension);
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match value {
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Some(c) => !c.starts_with(b"!"),
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None => false,
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}
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}
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/// If there is an `item` value in `section`, parse and return a list of
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/// byte strings.
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pub fn get_list(
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&self,
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section: &[u8],
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item: &[u8],
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) -> Option<Vec<Vec<u8>>> {
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self.get(section, item).map(values::parse_list)
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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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/// 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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if !layer.trusted {
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continue;
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}
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if let Some(v) = layer.get(§ion, &item) {
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return Some((&layer, v));
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}
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}
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None
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}
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/// Return all keys defined for the given section
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pub fn get_section_keys(&self, section: &[u8]) -> HashSet<&[u8]> {
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self.layers
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.iter()
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.flat_map(|layer| layer.iter_keys(section))
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.collect()
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}
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/// Returns whether any key is defined in the given section
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pub fn has_non_empty_section(&self, section: &[u8]) -> bool {
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self.layers
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.iter()
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.any(|layer| layer.has_non_empty_section(section))
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}
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/// Yields (key, value) pairs for everything in the given section
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pub fn iter_section<'a>(
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&'a self,
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section: &'a [u8],
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) -> impl Iterator<Item = (&[u8], &[u8])> + 'a {
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// TODO: Use `Iterator`’s `.peekable()` when its `peek_mut` is
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// available:
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// https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.peek_mut
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struct Peekable<I: Iterator> {
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iter: I,
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/// Remember a peeked value, even if it was None.
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peeked: Option<Option<I::Item>>,
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}
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impl<I: Iterator> Peekable<I> {
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fn new(iter: I) -> Self {
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Self { iter, peeked: None }
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}
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fn next(&mut self) {
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self.peeked = None
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}
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fn peek_mut(&mut self) -> Option<&mut I::Item> {
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let iter = &mut self.iter;
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self.peeked.get_or_insert_with(|| iter.next()).as_mut()
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}
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}
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// Deduplicate keys redefined in multiple layers
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let mut keys_already_seen = HashSet::new();
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let mut key_is_new =
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move |&(key, _value): &(&'a [u8], &'a [u8])| -> bool {
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keys_already_seen.insert(key)
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};
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// This is similar to `flat_map` + `filter_map`, except with a single
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// closure that owns `key_is_new` (and therefore the
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// `keys_already_seen` set):
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let mut layer_iters = Peekable::new(
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self.layers
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.iter()
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.rev()
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.map(move |layer| layer.iter_section(section)),
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);
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std::iter::from_fn(move || loop {
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if let Some(pair) = layer_iters.peek_mut()?.find(&mut key_is_new) {
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return Some(pair);
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} else {
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layer_iters.next();
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}
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})
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}
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/// Get raw values bytes from all layers (even untrusted ones) in order
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/// of precedence.
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#[cfg(test)]
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fn get_all(&self, section: &[u8], item: &[u8]) -> Vec<&[u8]> {
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let mut res = vec![];
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for layer in self.layers.iter().rev() {
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if let Some(v) = layer.get(§ion, &item) {
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res.push(v.bytes.as_ref());
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}
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}
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res
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use pretty_assertions::assert_eq;
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use std::fs::File;
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use std::io::Write;
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#[test]
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fn test_include_layer_ordering() {
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let tmpdir = tempfile::tempdir().unwrap();
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let tmpdir_path = tmpdir.path();
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let mut included_file =
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File::create(&tmpdir_path.join("included.rc")).unwrap();
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included_file.write_all(b"[section]\nitem=value1").unwrap();
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let base_config_path = tmpdir_path.join("base.rc");
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let mut config_file = File::create(&base_config_path).unwrap();
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let data =
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b"[section]\nitem=value0\n%include included.rc\nitem=value2\n\
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[section2]\ncount = 4\nsize = 1.5 KB\nnot-count = 1.5\nnot-size = 1 ub";
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config_file.write_all(data).unwrap();
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let sources = vec![ConfigSource::AbsPath(base_config_path)];
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let config = Config::load_from_explicit_sources(sources)
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.expect("expected valid config");
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let (_, value) = config.get_inner(b"section", b"item").unwrap();
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assert_eq!(
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value,
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&ConfigValue {
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bytes: b"value2".to_vec(),
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line: Some(4)
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}
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);
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let value = config.get(b"section", b"item").unwrap();
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assert_eq!(value, b"value2",);
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assert_eq!(
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config.get_all(b"section", b"item"),
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[b"value2", b"value1", b"value0"]
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);
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assert_eq!(config.get_u32(b"section2", b"count").unwrap(), Some(4));
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assert_eq!(
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config.get_byte_size(b"section2", b"size").unwrap(),
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|
Some(1024 + 512)
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|
);
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assert!(config.get_u32(b"section2", b"not-count").is_err());
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|
assert!(config.get_byte_size(b"section2", b"not-size").is_err());
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}
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}
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|
