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Differential D9961

rust: Parse system and user configuration
ClosedPublic

Authored by SimonSapin on Feb 5 2021, 4:26 AM.

Details

Reviewers
Alphare
pulkit
Group Reviewers
hg-reviewers
Commits
rHG2845892dd489: rust: Parse system and user configuration
Summary

CLI --config argument parsing is still missing, as is per-repo config

Diff Detail

Repository
rHG Mercurial
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

SimonSapin created this revision.Feb 5 2021, 4:26 AM
Alphare accepted this revision.Feb 8 2021, 9:21 AM
Alphare added a subscriber: Alphare.
Alphare added inline comments.
rust/hg-core/src/config/config.rs
133

typo 'platforms'

144

The order in config.txt is the same as the code, isn't it?

SimonSapin added inline comments.Feb 8 2021, 1:33 PM
rust/hg-core/src/config/config.rs
144

The code lists weakest precedence first (in Python because later config.set method calls overwrite previous values in a dict, in Rust because get_inner uses .rev() to find the last value for a given key). But config.txt lists strongest precedence first, starting with per-repository.

SimonSapin updated this revision to Diff 25498.Feb 8 2021, 2:00 PM
Alphare accepted this revision.Feb 9 2021, 3:39 AM
Alphare added inline comments.
rust/hg-core/src/config/config.rs
144

Maybe we should open a discussion or a bug about it. Right now, being compliant with the implementation seems like a safe bet.

pulkit accepted this revision.Feb 10 2021, 7:11 AM
This revision is now accepted and ready to land.Feb 10 2021, 7:11 AM
SimonSapin added a commit: rHG2845892dd489: rust: Parse system and user configuration.Feb 10 2021, 8:07 AM
Closed by commit rHG2845892dd489: rust: Parse system and user configuration (authored by SimonSapin). · Explain Why
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

Diff 25528

rust/Cargo.lock

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] ]
[[package]] [[package]]
name = "home"
version = "0.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
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[[package]]
name = "humantime" name = "humantime"
version = "1.3.0" version = "1.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [ dependencies = [
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] ]
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rust/hg-core/Cargo.toml

[package] [package]
name = "hg-core" name = "hg-core"
version = "0.1.0" version = "0.1.0"
authors = ["Georges Racinet <gracinet@anybox.fr>"] authors = ["Georges Racinet <gracinet@anybox.fr>"]
description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)" description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
edition = "2018" edition = "2018"
[lib] [lib]
name = "hg" name = "hg"
[dependencies] [dependencies]
bytes-cast = "0.1" bytes-cast = "0.1"
byteorder = "1.3.4" byteorder = "1.3.4"
derive_more = "0.99" derive_more = "0.99"
home = "0.5"
im-rc = "15.0.*" im-rc = "15.0.*"
lazy_static = "1.4.0" lazy_static = "1.4.0"
memchr = "2.3.3" memchr = "2.3.3"
rand = "0.7.3" rand = "0.7.3"
rand_pcg = "0.2.1" rand_pcg = "0.2.1"
rand_distr = "0.2.2" rand_distr = "0.2.2"
rayon = "1.3.0" rayon = "1.3.0"
regex = "1.3.9" regex = "1.3.9"

rust/hg-core/src/config.rs

// config.rs // config.rs
// //
// Copyright 2020 // Copyright 2020
// Valentin Gatien-Baron, // Valentin Gatien-Baron,
// Raphaël Gomès <rgomes@octobus.net> // Raphaël Gomès <rgomes@octobus.net>
// //
// This software may be used and distributed according to the terms of the // This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version. // GNU General Public License version 2 or any later version.
//! Mercurial config parsing and interfaces. //! Mercurial config parsing and interfaces.
mod config; mod config;
mod layer; mod layer;
pub use config::Config; pub use config::Config;
pub use layer::{ConfigError, ConfigParseError};

rust/hg-core/src/config/config.rs

// config.rs // config.rs
// //
// Copyright 2020 // Copyright 2020
// Valentin Gatien-Baron, // Valentin Gatien-Baron,
// Raphaël Gomès <rgomes@octobus.net> // Raphaël Gomès <rgomes@octobus.net>
// //
// This software may be used and distributed according to the terms of the // This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version. // GNU General Public License version 2 or any later version.
use super::layer; use super::layer;
use crate::config::layer::{ use crate::config::layer::{
ConfigError, ConfigLayer, ConfigParseError, ConfigValue, ConfigError, ConfigLayer, ConfigParseError, ConfigValue,
}; };
use std::path::PathBuf; use crate::utils::files::get_bytes_from_path;
use std::env;
use std::path::{Path, PathBuf};
use crate::errors::{HgResultExt, IoResultExt};
use crate::repo::Repo; use crate::repo::Repo;
/// Holds the config values for the current repository /// Holds the config values for the current repository
/// TODO update this docstring once we support more sources /// TODO update this docstring once we support more sources
pub struct Config { pub struct Config {
layers: Vec<layer::ConfigLayer>, layers: Vec<layer::ConfigLayer>,
} }
match v.to_ascii_lowercase().as_slice() { match v.to_ascii_lowercase().as_slice() {
b"1" | b"yes" | b"true" | b"on" | b"always" => Some(true), b"1" | b"yes" | b"true" | b"on" | b"always" => Some(true),
b"0" | b"no" | b"false" | b"off" | b"never" => Some(false), b"0" | b"no" | b"false" | b"off" | b"never" => Some(false),
_ => None, _ => None,
} }
} }
impl Config { impl Config {
/// Load system and user configuration from various files.
///
/// This is also affected by some environment variables.
///
/// TODO: add a parameter for `--config` CLI arguments
pub fn load() -> Result<Self, ConfigError> {
let mut config = Self { layers: Vec::new() };
let opt_rc_path = env::var_os("HGRCPATH");
// HGRCPATH replaces system config
if opt_rc_path.is_none() {
config.add_system_config()?
}
config.add_for_environment_variable("EDITOR", b"ui", b"editor");
config.add_for_environment_variable("VISUAL", b"ui", b"editor");
config.add_for_environment_variable("PAGER", b"pager", b"pager");
// HGRCPATH replaces user config
if opt_rc_path.is_none() {
config.add_user_config()?
}
if let Some(rc_path) = &opt_rc_path {
for path in env::split_paths(rc_path) {
if !path.as_os_str().is_empty() {
if path.is_dir() {
config.add_trusted_dir(&path)?
} else {
config.add_trusted_file(&path)?
}
}
}
}
Ok(config)
}
fn add_trusted_dir(&mut self, path: &Path) -> Result<(), ConfigError> {
if let Some(entries) = std::fs::read_dir(path)
.for_file(path)
.io_not_found_as_none()?
{
for entry in entries {
let file_path = entry.for_file(path)?.path();
if file_path.extension() == Some(std::ffi::OsStr::new("rc")) {
self.add_trusted_file(&file_path)?
}
}
}
Ok(())
}
fn add_trusted_file(&mut self, path: &Path) -> Result<(), ConfigError> {
if let Some(data) =
std::fs::read(path).for_file(path).io_not_found_as_none()?
{
self.layers.extend(ConfigLayer::parse(path, &data)?)
}
Ok(())
}
fn add_for_environment_variable(
&mut self,
var: &str,
section: &[u8],
key: &[u8],
) {
if let Some(value) = env::var_os(var) {
let origin = layer::ConfigOrigin::Environment(var.into());
let mut layer = ConfigLayer::new(origin);
layer.add(
section.to_owned(),
key.to_owned(),
// `value` is not a path but this works for any `OsStr`:
get_bytes_from_path(value),
None,
);
self.layers.push(layer)
}
}
#[cfg(unix)] // TODO: other platforms
AlphareUnsubmitted
Not Done

typo 'platforms'

Alphare: typo 'platforms'
fn add_system_config(&mut self) -> Result<(), ConfigError> {
let mut add_for_prefix = |prefix: &Path| -> Result<(), ConfigError> {
let etc = prefix.join("etc").join("mercurial");
self.add_trusted_file(&etc.join("hgrc"))?;
self.add_trusted_dir(&etc.join("hgrc.d"))
};
let root = Path::new("/");
// TODO: use `std::env::args_os().next().unwrap()` a.k.a. argv[0]
// instead? TODO: can this be a relative path?
let hg = crate::utils::current_exe()?;
// TODO: this order (per-installation then per-system) matches
AlphareUnsubmitted
Not Done

The order in config.txt is the same as the code, isn't it?

Alphare: The order in `config.txt` is the same as the code, isn't it?
SimonSapinAuthorUnsubmitted
Done

The code lists weakest precedence first (in Python because later config.set method calls overwrite previous values in a dict, in Rust because get_inner uses .rev() to find the last value for a given key). But config.txt lists strongest precedence first, starting with per-repository.

SimonSapin: The code lists weakest precedence first (in Python because later `config.set` method calls…
AlphareUnsubmitted
Not Done

Maybe we should open a discussion or a bug about it. Right now, being compliant with the implementation seems like a safe bet.

Alphare: Maybe we should open a discussion or a bug about it. Right now, being compliant with the…
// `systemrcpath()` in `mercurial/scmposix.py`, but
// `mercurial/helptext/config.txt` suggests it should be reversed
if let Some(installation_prefix) = hg.parent().and_then(Path::parent) {
if installation_prefix != root {
add_for_prefix(&installation_prefix)?
}
}
add_for_prefix(root)?;
Ok(())
}
#[cfg(unix)] // TODO: other plateforms
fn add_user_config(&mut self) -> Result<(), ConfigError> {
let opt_home = home::home_dir();
if let Some(home) = &opt_home {
self.add_trusted_file(&home.join(".hgrc"))?
}
let darwin = cfg!(any(target_os = "macos", target_os = "ios"));
if !darwin {
if let Some(config_home) = env::var_os("XDG_CONFIG_HOME")
.map(PathBuf::from)
.or_else(|| opt_home.map(|home| home.join(".config")))
{
self.add_trusted_file(&config_home.join("hg").join("hgrc"))?
}
}
Ok(())
}
/// Loads in order, which means that the precedence is the same /// Loads in order, which means that the precedence is the same
/// as the order of `sources`. /// as the order of `sources`.
pub fn load_from_explicit_sources( pub fn load_from_explicit_sources(
sources: Vec<ConfigSource>, sources: Vec<ConfigSource>,
) -> Result<Self, ConfigError> { ) -> Result<Self, ConfigError> {
let mut layers = vec![]; let mut layers = vec![];
for source in sources.into_iter() { for source in sources.into_iter() {

rust/hg-core/src/config/layer.rs

* Others? */ * Others? */
} }
impl ConfigOrigin { impl ConfigOrigin {
/// TODO use some kind of dedicated trait? /// TODO use some kind of dedicated trait?
pub fn to_bytes(&self) -> Vec<u8> { pub fn to_bytes(&self) -> Vec<u8> {
match self { match self {
ConfigOrigin::File(p) => get_bytes_from_path(p), ConfigOrigin::File(p) => get_bytes_from_path(p),
ConfigOrigin::Environment(e) => e.to_owned(), ConfigOrigin::Environment(e) => format_bytes!(b"${}", e),
} }
} }
} }
#[derive(Debug)] #[derive(Debug)]
pub struct ConfigParseError { pub struct ConfigParseError {
pub origin: ConfigOrigin, pub origin: ConfigOrigin,
pub line: Option<usize>, pub line: Option<usize>,

rust/hg-core/src/errors.rs

/// The given string is a short explanation for users, not intended to be /// The given string is a short explanation for users, not intended to be
/// machine-readable. /// machine-readable.
UnsupportedFeature(String), UnsupportedFeature(String),
} }
/// Details about where an I/O error happened /// Details about where an I/O error happened
#[derive(Debug, derive_more::From)] #[derive(Debug, derive_more::From)]
pub enum IoErrorContext { pub enum IoErrorContext {
/// A filesystem operation returned `std::io::Error` /// A filesystem operation for the given file
#[from] #[from]
File(std::path::PathBuf), File(std::path::PathBuf),
/// `std::env::current_dir` returned `std::io::Error` /// `std::env::current_dir`
CurrentDir, CurrentDir,
/// `std::env::current_exe`
CurrentExe,
} }
impl HgError { impl HgError {
pub fn corrupted(explanation: impl Into<String>) -> Self { pub fn corrupted(explanation: impl Into<String>) -> Self {
// TODO: capture a backtrace here and keep it in the error value // TODO: capture a backtrace here and keep it in the error value
// to aid debugging? // to aid debugging?
// https://doc.rust-lang.org/std/backtrace/struct.Backtrace.html // https://doc.rust-lang.org/std/backtrace/struct.Backtrace.html
HgError::CorruptedRepository(explanation.into()) HgError::CorruptedRepository(explanation.into())
} }
// TODO: use `DisplayBytes` instead to show non-Unicode filenames losslessly? // TODO: use `DisplayBytes` instead to show non-Unicode filenames losslessly?
impl fmt::Display for IoErrorContext { impl fmt::Display for IoErrorContext {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self { match self {
IoErrorContext::File(path) => path.display().fmt(f), IoErrorContext::File(path) => path.display().fmt(f),
IoErrorContext::CurrentDir => f.write_str("current directory"), IoErrorContext::CurrentDir => f.write_str("current directory"),
IoErrorContext::CurrentExe => f.write_str("current executable"),
} }
} }
} }
pub trait IoResultExt<T> { pub trait IoResultExt<T> {
/// Annotate a possible I/O error as related to a file at the given path. /// Annotate a possible I/O error as related to a file at the given path.
/// ///
/// This allows printing something like “File not found: example.txt” /// This allows printing something like “File not found: example.txt”

rust/hg-core/src/utils.rs

} }
pub fn current_dir() -> Result<std::path::PathBuf, HgError> { pub fn current_dir() -> Result<std::path::PathBuf, HgError> {
std::env::current_dir().map_err(|error| HgError::IoError { std::env::current_dir().map_err(|error| HgError::IoError {
error, error,
context: IoErrorContext::CurrentDir, context: IoErrorContext::CurrentDir,
}) })
} }
pub fn current_exe() -> Result<std::path::PathBuf, HgError> {
std::env::current_exe().map_err(|error| HgError::IoError {
error,
context: IoErrorContext::CurrentExe,
})
}