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extern crate log;
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use crate::ui::Ui;
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use clap::App;
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use clap::AppSettings;
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use clap::Arg;
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use clap::ArgMatches;
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use format_bytes::{format_bytes, join};
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use hg::config::{Config, ConfigSource};
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use hg::repo::{Repo, RepoError};
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use hg::utils::files::{get_bytes_from_os_str, get_path_from_bytes};
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use hg::utils::SliceExt;
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use std::ffi::OsString;
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use std::path::PathBuf;
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use std::process::Command;
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mod blackbox;
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mod error;
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mod exitcode;
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mod ui;
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use error::CommandError;
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fn main_with_result(
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process_start_time: &blackbox::ProcessStartTime,
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ui: &ui::Ui,
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repo: Result<&Repo, &NoRepoInCwdError>,
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config: &Config,
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) -> Result<(), CommandError> {
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check_extensions(config)?;
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let app = App::new("rhg")
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.global_setting(AppSettings::AllowInvalidUtf8)
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.global_setting(AppSettings::DisableVersion)
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.setting(AppSettings::SubcommandRequired)
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.setting(AppSettings::VersionlessSubcommands)
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.arg(
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Arg::with_name("repository")
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.help("repository root directory")
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.short("-R")
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.long("--repository")
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.value_name("REPO")
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.takes_value(true)
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// Both ok: `hg -R ./foo log` or `hg log -R ./foo`
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.global(true),
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)
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.arg(
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Arg::with_name("config")
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.help("set/override config option (use 'section.name=value')")
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.long("--config")
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.value_name("CONFIG")
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.takes_value(true)
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.global(true)
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// Ok: `--config section.key1=val --config section.key2=val2`
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.multiple(true)
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// Not ok: `--config section.key1=val section.key2=val2`
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.number_of_values(1),
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)
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.arg(
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Arg::with_name("cwd")
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.help("change working directory")
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.long("--cwd")
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.value_name("DIR")
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.takes_value(true)
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.global(true),
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)
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.version("0.0.1");
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let app = add_subcommand_args(app);
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let matches = app.clone().get_matches_safe()?;
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let (subcommand_name, subcommand_matches) = matches.subcommand();
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let run = subcommand_run_fn(subcommand_name)
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.expect("unknown subcommand name from clap despite AppSettings::SubcommandRequired");
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let subcommand_args = subcommand_matches
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.expect("no subcommand arguments from clap despite AppSettings::SubcommandRequired");
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let invocation = CliInvocation {
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ui,
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subcommand_args,
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config,
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repo,
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};
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let blackbox = blackbox::Blackbox::new(&invocation, process_start_time)?;
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blackbox.log_command_start();
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let result = run(&invocation);
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blackbox.log_command_end(exit_code(
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&result,
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// TODO: show a warning or combine with original error if `get_bool`
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// returns an error
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config
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.get_bool(b"ui", b"detailed-exit-code")
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.unwrap_or(false),
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));
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result
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}
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fn main() {
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// Run this first, before we find out if the blackbox extension is even
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// enabled, in order to include everything in-between in the duration
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// measurements. Reading config files can be slow if they’re on NFS.
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let process_start_time = blackbox::ProcessStartTime::now();
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env_logger::init();
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let ui = ui::Ui::new();
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let early_args = EarlyArgs::parse(std::env::args_os());
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let initial_current_dir = early_args.cwd.map(|cwd| {
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let cwd = get_path_from_bytes(&cwd);
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std::env::current_dir()
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.and_then(|initial| {
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std::env::set_current_dir(cwd)?;
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Ok(initial)
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})
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.unwrap_or_else(|error| {
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exit(
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&None,
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&ui,
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OnUnsupported::Abort,
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Err(CommandError::abort(format!(
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"abort: {}: '{}'",
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error,
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cwd.display()
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))),
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false,
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)
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})
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});
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let non_repo_config =
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Config::load(early_args.config).unwrap_or_else(|error| {
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// Normally this is decided based on config, but we don’t have that
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// available. As of this writing config loading never returns an
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// "unsupported" error but that is not enforced by the type system.
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let on_unsupported = OnUnsupported::Abort;
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exit(
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&initial_current_dir,
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&ui,
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on_unsupported,
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Err(error.into()),
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false,
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)
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});
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if let Some(repo_path_bytes) = &early_args.repo {
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lazy_static::lazy_static! {
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static ref SCHEME_RE: regex::bytes::Regex =
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// Same as `_matchscheme` in `mercurial/util.py`
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regex::bytes::Regex::new("^[a-zA-Z0-9+.\\-]+:").unwrap();
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}
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if SCHEME_RE.is_match(&repo_path_bytes) {
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exit(
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&initial_current_dir,
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&ui,
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OnUnsupported::from_config(&ui, &non_repo_config),
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Err(CommandError::UnsupportedFeature {
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message: format_bytes!(
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b"URL-like --repository {}",
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repo_path_bytes
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),
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}),
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// TODO: show a warning or combine with original error if
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// `get_bool` returns an error
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non_repo_config
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.get_bool(b"ui", b"detailed-exit-code")
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.unwrap_or(false),
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)
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}
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}
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let repo_arg = early_args.repo.unwrap_or(Vec::new());
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let repo_path: Option<PathBuf> = {
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if repo_arg.is_empty() {
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None
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} else {
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let local_config = {
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if std::env::var_os("HGRCSKIPREPO").is_none() {
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// TODO: handle errors from find_repo_root
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if let Ok(current_dir_path) = Repo::find_repo_root() {
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let config_files = vec![
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ConfigSource::AbsPath(
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current_dir_path.join(".hg/hgrc"),
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),
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ConfigSource::AbsPath(
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current_dir_path.join(".hg/hgrc-not-shared"),
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),
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];
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// TODO: handle errors from
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// `load_from_explicit_sources`
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Config::load_from_explicit_sources(config_files).ok()
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} else {
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None
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}
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} else {
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None
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}
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};
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let non_repo_config_val = {
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let non_repo_val = non_repo_config.get(b"paths", &repo_arg);
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match &non_repo_val {
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Some(val) if val.len() > 0 => home::home_dir()
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.unwrap_or_else(|| PathBuf::from("~"))
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.join(get_path_from_bytes(val))
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.canonicalize()
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// TODO: handle error and make it similar to python
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// implementation maybe?
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.ok(),
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_ => None,
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}
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};
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let config_val = match &local_config {
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None => non_repo_config_val,
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Some(val) => {
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let local_config_val = val.get(b"paths", &repo_arg);
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match &local_config_val {
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Some(val) if val.len() > 0 => {
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// presence of a local_config assures that
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// current_dir
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// wont result in an Error
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let canpath = hg::utils::current_dir()
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.unwrap()
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.join(get_path_from_bytes(val))
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.canonicalize();
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canpath.ok().or(non_repo_config_val)
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}
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_ => non_repo_config_val,
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}
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}
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};
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config_val.or(Some(get_path_from_bytes(&repo_arg).to_path_buf()))
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}
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};
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let repo_result = match Repo::find(&non_repo_config, repo_path.to_owned())
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{
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Ok(repo) => Ok(repo),
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Err(RepoError::NotFound { at }) if repo_path.is_none() => {
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// Not finding a repo is not fatal yet, if `-R` was not given
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Err(NoRepoInCwdError { cwd: at })
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}
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Err(error) => exit(
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&initial_current_dir,
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&ui,
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OnUnsupported::from_config(&ui, &non_repo_config),
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Err(error.into()),
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// TODO: show a warning or combine with original error if
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// `get_bool` returns an error
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non_repo_config
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.get_bool(b"ui", b"detailed-exit-code")
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.unwrap_or(false),
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),
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};
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let config = if let Ok(repo) = &repo_result {
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repo.config()
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} else {
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&non_repo_config
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};
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let on_unsupported = OnUnsupported::from_config(&ui, config);
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let result = main_with_result(
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&process_start_time,
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&ui,
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repo_result.as_ref(),
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config,
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);
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exit(
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&initial_current_dir,
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&ui,
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on_unsupported,
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result,
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// TODO: show a warning or combine with original error if `get_bool`
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// returns an error
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config
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.get_bool(b"ui", b"detailed-exit-code")
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.unwrap_or(false),
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)
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}
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fn exit_code(
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result: &Result<(), CommandError>,
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use_detailed_exit_code: bool,
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) -> i32 {
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match result {
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Ok(()) => exitcode::OK,
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Err(CommandError::Abort {
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message: _,
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detailed_exit_code,
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}) => {
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if use_detailed_exit_code {
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*detailed_exit_code
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} else {
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exitcode::ABORT
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}
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}
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Err(CommandError::Unsuccessful) => exitcode::UNSUCCESSFUL,
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// Exit with a specific code and no error message to let a potential
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// wrapper script fallback to Python-based Mercurial.
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Err(CommandError::UnsupportedFeature { .. }) => {
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exitcode::UNIMPLEMENTED
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}
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}
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}
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fn exit(
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initial_current_dir: &Option<PathBuf>,
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ui: &Ui,
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mut on_unsupported: OnUnsupported,
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result: Result<(), CommandError>,
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use_detailed_exit_code: bool,
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) -> ! {
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if let (
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OnUnsupported::Fallback { executable },
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Err(CommandError::UnsupportedFeature { .. }),
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) = (&on_unsupported, &result)
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{
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let mut args = std::env::args_os();
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let executable_path = get_path_from_bytes(&executable);
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let this_executable = args.next().expect("exepcted argv[0] to exist");
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if executable_path == &PathBuf::from(this_executable) {
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// Avoid spawning infinitely many processes until resource
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// exhaustion.
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let _ = ui.write_stderr(&format_bytes!(
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b"Blocking recursive fallback. The 'rhg.fallback-executable = {}' config \
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points to `rhg` itself.\n",
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executable
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));
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on_unsupported = OnUnsupported::Abort
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} else {
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// `args` is now `argv[1..]` since we’ve already consumed `argv[0]`
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let mut command = Command::new(executable_path);
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command.args(args);
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if let Some(initial) = initial_current_dir {
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command.current_dir(initial);
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}
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let result = command.status();
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match result {
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Ok(status) => std::process::exit(
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status.code().unwrap_or(exitcode::ABORT),
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),
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Err(error) => {
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let _ = ui.write_stderr(&format_bytes!(
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b"tried to fall back to a '{}' sub-process but got error {}\n",
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executable, format_bytes::Utf8(error)
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));
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on_unsupported = OnUnsupported::Abort
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}
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}
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}
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}
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exit_no_fallback(ui, on_unsupported, result, use_detailed_exit_code)
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}
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fn exit_no_fallback(
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ui: &Ui,
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on_unsupported: OnUnsupported,
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result: Result<(), CommandError>,
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use_detailed_exit_code: bool,
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) -> ! {
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match &result {
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Ok(_) => {}
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Err(CommandError::Unsuccessful) => {}
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Err(CommandError::Abort {
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message,
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detailed_exit_code: _,
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}) => {
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if !message.is_empty() {
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// Ignore errors when writing to stderr, we’re already exiting
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// with failure code so there’s not much more we can do.
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let _ = ui.write_stderr(&format_bytes!(b"{}\n", message));
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}
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}
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Err(CommandError::UnsupportedFeature { message }) => {
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match on_unsupported {
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OnUnsupported::Abort => {
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let _ = ui.write_stderr(&format_bytes!(
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b"unsupported feature: {}\n",
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message
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));
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}
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OnUnsupported::AbortSilent => {}
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OnUnsupported::Fallback { .. } => unreachable!(),
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}
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}
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}
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std::process::exit(exit_code(&result, use_detailed_exit_code))
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}
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macro_rules! subcommands {
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($( $command: ident )+) => {
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mod commands {
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$(
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pub mod $command;
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)+
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}
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fn add_subcommand_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
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app
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$(
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.subcommand(commands::$command::args())
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)+
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}
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pub type RunFn = fn(&CliInvocation) -> Result<(), CommandError>;
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fn subcommand_run_fn(name: &str) -> Option<RunFn> {
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match name {
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$(
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stringify!($command) => Some(commands::$command::run),
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)+
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_ => None,
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}
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}
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};
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}
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subcommands! {
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cat
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debugdata
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debugrequirements
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files
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root
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config
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status
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}
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pub struct CliInvocation<'a> {
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ui: &'a Ui,
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subcommand_args: &'a ArgMatches<'a>,
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config: &'a Config,
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|
/// References inside `Result` is a bit peculiar but allow
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/// `invocation.repo?` to work out with `&CliInvocation` since this
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/// `Result` type is `Copy`.
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repo: Result<&'a Repo, &'a NoRepoInCwdError>,
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}
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struct NoRepoInCwdError {
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cwd: PathBuf,
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}
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|
|
|
|
/// CLI arguments to be parsed "early" in order to be able to read
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/// configuration before using Clap. Ideally we would also use Clap for this,
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|
/// see <https://github.com/clap-rs/clap/discussions/2366>.
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///
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/// These arguments are still declared when we do use Clap later, so that Clap
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/// does not return an error for their presence.
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struct EarlyArgs {
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/// Values of all `--config` arguments. (Possibly none)
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|
config: Vec<Vec<u8>>,
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|
/// Value of the `-R` or `--repository` argument, if any.
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|
repo: Option<Vec<u8>>,
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|
/// Value of the `--cwd` argument, if any.
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|
cwd: Option<Vec<u8>>,
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|
}
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|
|
|
|
impl EarlyArgs {
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|
fn parse(args: impl IntoIterator<Item = OsString>) -> Self {
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|
let mut args = args.into_iter().map(get_bytes_from_os_str);
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|
let mut config = Vec::new();
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|
let mut repo = None;
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|
let mut cwd = None;
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|
// Use `while let` instead of `for` so that we can also call
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|
// `args.next()` inside the loop.
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|
while let Some(arg) = args.next() {
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|
if arg == b"--config" {
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|
if let Some(value) = args.next() {
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|
config.push(value)
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|
}
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} else if let Some(value) = arg.drop_prefix(b"--config=") {
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|
config.push(value.to_owned())
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|
}
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|
|
|
|
if arg == b"--cwd" {
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|
if let Some(value) = args.next() {
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|
cwd = Some(value)
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|
}
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|
} else if let Some(value) = arg.drop_prefix(b"--cwd=") {
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|
cwd = Some(value.to_owned())
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|
|
}
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|
|
|
|
if arg == b"--repository" || arg == b"-R" {
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|
|
if let Some(value) = args.next() {
|
|
|
repo = Some(value)
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|
|
}
|
|
|
} else if let Some(value) = arg.drop_prefix(b"--repository=") {
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|
|
repo = Some(value.to_owned())
|
|
|
} else if let Some(value) = arg.drop_prefix(b"-R") {
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|
|
repo = Some(value.to_owned())
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|
|
}
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|
|
}
|
|
|
Self { config, repo, cwd }
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|
|
}
|
|
|
}
|
|
|
|
|
|
/// What to do when encountering some unsupported feature.
|
|
|
///
|
|
|
/// See `HgError::UnsupportedFeature` and `CommandError::UnsupportedFeature`.
|
|
|
enum OnUnsupported {
|
|
|
/// Print an error message describing what feature is not supported,
|
|
|
/// and exit with code 252.
|
|
|
Abort,
|
|
|
/// Silently exit with code 252.
|
|
|
AbortSilent,
|
|
|
/// Try running a Python implementation
|
|
|
Fallback { executable: Vec<u8> },
|
|
|
}
|
|
|
|
|
|
impl OnUnsupported {
|
|
|
const DEFAULT: Self = OnUnsupported::Abort;
|
|
|
|
|
|
fn from_config(ui: &Ui, config: &Config) -> Self {
|
|
|
match config
|
|
|
.get(b"rhg", b"on-unsupported")
|
|
|
.map(|value| value.to_ascii_lowercase())
|
|
|
.as_deref()
|
|
|
{
|
|
|
Some(b"abort") => OnUnsupported::Abort,
|
|
|
Some(b"abort-silent") => OnUnsupported::AbortSilent,
|
|
|
Some(b"fallback") => OnUnsupported::Fallback {
|
|
|
executable: config
|
|
|
.get(b"rhg", b"fallback-executable")
|
|
|
.unwrap_or_else(|| {
|
|
|
exit_no_fallback(
|
|
|
ui,
|
|
|
Self::Abort,
|
|
|
Err(CommandError::abort(
|
|
|
"abort: 'rhg.on-unsupported=fallback' without \
|
|
|
'rhg.fallback-executable' set."
|
|
|
)),
|
|
|
false,
|
|
|
)
|
|
|
})
|
|
|
.to_owned(),
|
|
|
},
|
|
|
None => Self::DEFAULT,
|
|
|
Some(_) => {
|
|
|
// TODO: warn about unknown config value
|
|
|
Self::DEFAULT
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
const SUPPORTED_EXTENSIONS: &[&[u8]] = &[b"blackbox", b"share"];
|
|
|
|
|
|
fn check_extensions(config: &Config) -> Result<(), CommandError> {
|
|
|
let enabled = config.get_section_keys(b"extensions");
|
|
|
|
|
|
let mut unsupported = enabled;
|
|
|
for supported in SUPPORTED_EXTENSIONS {
|
|
|
unsupported.remove(supported);
|
|
|
}
|
|
|
|
|
|
if let Some(ignored_list) =
|
|
|
config.get_simple_list(b"rhg", b"ignored-extensions")
|
|
|
{
|
|
|
for ignored in ignored_list {
|
|
|
unsupported.remove(ignored);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if unsupported.is_empty() {
|
|
|
Ok(())
|
|
|
} else {
|
|
|
Err(CommandError::UnsupportedFeature {
|
|
|
message: format_bytes!(
|
|
|
b"extensions: {} (consider adding them to 'rhg.ignored-extensions' config)",
|
|
|
join(unsupported, b", ")
|
|
|
),
|
|
|
})
|
|
|
}
|
|
|
}
|
|
|
|