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annotate rust/rhg/src/main.rs @ 46731:3d692e724d06

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rhg: Align config file parse error formatting with Python Differences can cause tests to fail Differential Revision: https://phab.mercurial-scm.org/D10110
author Simon Sapin <simon.sapin@octobus.net>
date Wed, 03 Mar 2021 19:47:48 +0100
parents 6cd9f53aaed8
children 1bac7764ceef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 extern crate log;
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2 use crate::ui::Ui;
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3 use clap::App;
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4 use clap::AppSettings;
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5 use clap::Arg;
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6 use clap::ArgMatches;
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7 use format_bytes::format_bytes;
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8 use hg::config::Config;
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9 use hg::repo::{Repo, RepoError};
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10 use hg::utils::files::{get_bytes_from_os_str, get_path_from_bytes};
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11 use hg::utils::SliceExt;
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12 use std::ffi::OsString;
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13 use std::path::PathBuf;
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14 use std::process::Command;
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15
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16 mod blackbox;
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17 mod error;
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18 mod exitcode;
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19 mod ui;
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20 use error::CommandError;
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21
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22 fn main_with_result(
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23 process_start_time: &blackbox::ProcessStartTime,
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24 ui: &ui::Ui,
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25 repo: Result<&Repo, &NoRepoInCwdError>,
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26 config: &Config,
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27 ) -> Result<(), CommandError> {
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28 let app = App::new("rhg")
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29 .global_setting(AppSettings::AllowInvalidUtf8)
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30 .setting(AppSettings::SubcommandRequired)
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31 .setting(AppSettings::VersionlessSubcommands)
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32 .arg(
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33 Arg::with_name("repository")
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34 .help("repository root directory")
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35 .short("-R")
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36 .long("--repository")
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37 .value_name("REPO")
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38 .takes_value(true)
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39 // Both ok: `hg -R ./foo log` or `hg log -R ./foo`
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40 .global(true),
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41 )
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42 .arg(
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43 Arg::with_name("config")
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44 .help("set/override config option (use 'section.name=value')")
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45 .long("--config")
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46 .value_name("CONFIG")
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47 .takes_value(true)
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48 .global(true)
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49 // Ok: `--config section.key1=val --config section.key2=val2`
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50 .multiple(true)
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51 // Not ok: `--config section.key1=val section.key2=val2`
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52 .number_of_values(1),
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53 )
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54 .version("0.0.1");
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55 let app = add_subcommand_args(app);
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56
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57 let matches = app.clone().get_matches_safe()?;
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58
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59 let (subcommand_name, subcommand_matches) = matches.subcommand();
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60 let run = subcommand_run_fn(subcommand_name)
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61 .expect("unknown subcommand name from clap despite AppSettings::SubcommandRequired");
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62 let subcommand_args = subcommand_matches
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63 .expect("no subcommand arguments from clap despite AppSettings::SubcommandRequired");
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64
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65 let invocation = CliInvocation {
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66 ui,
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67 subcommand_args,
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68 config,
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69 repo,
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70 };
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71 let blackbox = blackbox::Blackbox::new(&invocation, process_start_time)?;
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72 blackbox.log_command_start();
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73 let result = run(&invocation);
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74 blackbox.log_command_end(exit_code(&result));
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75 result
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76 }
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77
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78 fn main() {
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79 // Run this first, before we find out if the blackbox extension is even
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80 // enabled, in order to include everything in-between in the duration
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81 // measurements. Reading config files can be slow if they’re on NFS.
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82 let process_start_time = blackbox::ProcessStartTime::now();
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83
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84 env_logger::init();
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85 let ui = ui::Ui::new();
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86
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87 let early_args = EarlyArgs::parse(std::env::args_os());
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88 let non_repo_config =
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89 Config::load(early_args.config).unwrap_or_else(|error| {
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90 // Normally this is decided based on config, but we don’t have that
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91 // available. As of this writing config loading never returns an
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92 // "unsupported" error but that is not enforced by the type system.
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93 let on_unsupported = OnUnsupported::Abort;
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94
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95 exit(&ui, on_unsupported, Err(error.into()))
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96 });
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97
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98 if let Some(repo_path_bytes) = &early_args.repo {
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99 lazy_static::lazy_static! {
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100 static ref SCHEME_RE: regex::bytes::Regex =
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101 // Same as `_matchscheme` in `mercurial/util.py`
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102 regex::bytes::Regex::new("^[a-zA-Z0-9+.\\-]+:").unwrap();
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103 }
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104 if SCHEME_RE.is_match(&repo_path_bytes) {
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105 exit(
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106 &ui,
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107 OnUnsupported::from_config(&non_repo_config),
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108 Err(CommandError::UnsupportedFeature {
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109 message: format_bytes!(
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110 b"URL-like --repository {}",
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111 repo_path_bytes
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112 ),
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113 }),
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114 )
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115 }
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116 }
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117 let repo_path = early_args.repo.as_deref().map(get_path_from_bytes);
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118 let repo_result = match Repo::find(&non_repo_config, repo_path) {
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119 Ok(repo) => Ok(repo),
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120 Err(RepoError::NotFound { at }) if repo_path.is_none() => {
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121 // Not finding a repo is not fatal yet, if `-R` was not given
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122 Err(NoRepoInCwdError { cwd: at })
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123 }
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124 Err(error) => exit(
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125 &ui,
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126 OnUnsupported::from_config(&non_repo_config),
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127 Err(error.into()),
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128 ),
46665
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129 };
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130
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131 let config = if let Ok(repo) = &repo_result {
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132 repo.config()
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133 } else {
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134 &non_repo_config
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135 };
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136
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137 let result = main_with_result(
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138 &process_start_time,
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139 &ui,
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140 repo_result.as_ref(),
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141 config,
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142 );
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143 exit(&ui, OnUnsupported::from_config(config), result)
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144 }
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145
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146 fn exit_code(result: &Result<(), CommandError>) -> i32 {
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147 match result {
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148 Ok(()) => exitcode::OK,
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149 Err(CommandError::Abort { .. }) => exitcode::ABORT,
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150
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151 // Exit with a specific code and no error message to let a potential
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152 // wrapper script fallback to Python-based Mercurial.
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153 Err(CommandError::UnsupportedFeature { .. }) => {
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154 exitcode::UNIMPLEMENTED
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155 }
46601
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156 }
44981
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157 }
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158
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159 fn exit(
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160 ui: &Ui,
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161 mut on_unsupported: OnUnsupported,
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162 result: Result<(), CommandError>,
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163 ) -> ! {
46667
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164 if let (
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165 OnUnsupported::Fallback { executable },
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166 Err(CommandError::UnsupportedFeature { .. }),
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167 ) = (&on_unsupported, &result)
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168 {
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169 let mut args = std::env::args_os();
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170 let executable_path = get_path_from_bytes(&executable);
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171 let this_executable = args.next().expect("exepcted argv[0] to exist");
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172 if executable_path == &PathBuf::from(this_executable) {
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173 // Avoid spawning infinitely many processes until resource
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174 // exhaustion.
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175 let _ = ui.write_stderr(&format_bytes!(
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176 b"Blocking recursive fallback. The 'rhg.fallback-executable = {}' config \
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177 points to `rhg` itself.\n",
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178 executable
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179 ));
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180 on_unsupported = OnUnsupported::Abort
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181 } else {
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182 // `args` is now `argv[1..]` since we’ve already consumed `argv[0]`
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183 let result = Command::new(executable_path).args(args).status();
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184 match result {
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185 Ok(status) => std::process::exit(
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186 status.code().unwrap_or(exitcode::ABORT),
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187 ),
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diff changeset
188 Err(error) => {
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189 let _ = ui.write_stderr(&format_bytes!(
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190 b"tried to fall back to a '{}' sub-process but got error {}\n",
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diff changeset
191 executable, format_bytes::Utf8(error)
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192 ));
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193 on_unsupported = OnUnsupported::Abort
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194 }
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195 }
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196 }
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197 }
46666
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diff changeset
198 match &result {
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diff changeset
199 Ok(_) => {}
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diff changeset
200 Err(CommandError::Abort { message }) => {
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parents: 46665
diff changeset
201 if !message.is_empty() {
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diff changeset
202 // Ignore errors when writing to stderr, we’re already exiting
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diff changeset
203 // with failure code so there’s not much more we can do.
46731
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204 let _ = ui.write_stderr(&format_bytes!(b"{}\n", message));
46666
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205 }
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
206 }
33f2d56acc73 rhg: Add a `rhg.on-unsupported` configuration key
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diff changeset
207 Err(CommandError::UnsupportedFeature { message }) => {
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diff changeset
208 match on_unsupported {
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diff changeset
209 OnUnsupported::Abort => {
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diff changeset
210 let _ = ui.write_stderr(&format_bytes!(
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diff changeset
211 b"unsupported feature: {}\n",
33f2d56acc73 rhg: Add a `rhg.on-unsupported` configuration key
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diff changeset
212 message
33f2d56acc73 rhg: Add a `rhg.on-unsupported` configuration key
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
213 ));
33f2d56acc73 rhg: Add a `rhg.on-unsupported` configuration key
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parents: 46665
diff changeset
214 }
33f2d56acc73 rhg: Add a `rhg.on-unsupported` configuration key
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parents: 46665
diff changeset
215 OnUnsupported::AbortSilent => {}
46667
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diff changeset
216 OnUnsupported::Fallback { .. } => unreachable!(),
46666
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diff changeset
217 }
46665
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diff changeset
218 }
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diff changeset
219 }
7284b524b441 rhg: Make configuration available as early as possible in main()
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diff changeset
220 std::process::exit(exit_code(&result))
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diff changeset
221 }
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
222
46502
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diff changeset
223 macro_rules! subcommands {
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diff changeset
224 ($( $command: ident )+) => {
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diff changeset
225 mod commands {
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diff changeset
226 $(
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diff changeset
227 pub mod $command;
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228 )+
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diff changeset
229 }
95d37db31479 rhg: Replace subcommand boilerplate with a macro
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diff changeset
230
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diff changeset
231 fn add_subcommand_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
95d37db31479 rhg: Replace subcommand boilerplate with a macro
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diff changeset
232 app
95d37db31479 rhg: Replace subcommand boilerplate with a macro
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diff changeset
233 $(
46608
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
234 .subcommand(commands::$command::args())
46502
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diff changeset
235 )+
95d37db31479 rhg: Replace subcommand boilerplate with a macro
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
236 }
46484
a6e4e4650bac rhg: Parse system and user configuration at program start
Simon Sapin <simon.sapin@octobus.net>
parents: 46445
diff changeset
237
46592
80840b651721 rhg: Group values passed to every sub-command into a struct
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
238 pub type RunFn = fn(&CliInvocation) -> Result<(), CommandError>;
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diff changeset
239
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
240 fn subcommand_run_fn(name: &str) -> Option<RunFn> {
46502
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Simon Sapin <simon.sapin@octobus.net>
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diff changeset
241 match name {
95d37db31479 rhg: Replace subcommand boilerplate with a macro
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
242 $(
95d37db31479 rhg: Replace subcommand boilerplate with a macro
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diff changeset
243 stringify!($command) => Some(commands::$command::run),
95d37db31479 rhg: Replace subcommand boilerplate with a macro
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diff changeset
244 )+
95d37db31479 rhg: Replace subcommand boilerplate with a macro
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
245 _ => None,
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diff changeset
246 }
45542
33ded2d3f4fc rhg: add a limited `rhg cat -r` subcommand
Antoine Cezar <antoine.cezar@octobus.net>
parents: 45537
diff changeset
247 }
46502
95d37db31479 rhg: Replace subcommand boilerplate with a macro
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
248 };
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249 }
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250
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251 subcommands! {
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252 cat
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253 debugdata
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254 debugrequirements
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255 files
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256 root
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257 config
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258 }
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259 pub struct CliInvocation<'a> {
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260 ui: &'a Ui,
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261 subcommand_args: &'a ArgMatches<'a>,
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262 config: &'a Config,
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263 /// References inside `Result` is a bit peculiar but allow
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264 /// `invocation.repo?` to work out with `&CliInvocation` since this
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265 /// `Result` type is `Copy`.
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266 repo: Result<&'a Repo, &'a NoRepoInCwdError>,
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267 }
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268
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269 struct NoRepoInCwdError {
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270 cwd: PathBuf,
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271 }
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272
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273 /// CLI arguments to be parsed "early" in order to be able to read
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274 /// configuration before using Clap. Ideally we would also use Clap for this,
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275 /// see <https://github.com/clap-rs/clap/discussions/2366>.
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276 ///
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277 /// These arguments are still declared when we do use Clap later, so that Clap
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278 /// does not return an error for their presence.
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279 struct EarlyArgs {
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280 /// Values of all `--config` arguments. (Possibly none)
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281 config: Vec<Vec<u8>>,
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282 /// Value of the `-R` or `--repository` argument, if any.
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283 repo: Option<Vec<u8>>,
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284 }
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285
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286 impl EarlyArgs {
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287 fn parse(args: impl IntoIterator<Item = OsString>) -> Self {
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288 let mut args = args.into_iter().map(get_bytes_from_os_str);
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289 let mut config = Vec::new();
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290 let mut repo = None;
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291 // Use `while let` instead of `for` so that we can also call
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292 // `args.next()` inside the loop.
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293 while let Some(arg) = args.next() {
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294 if arg == b"--config" {
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295 if let Some(value) = args.next() {
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296 config.push(value)
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297 }
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298 } else if let Some(value) = arg.drop_prefix(b"--config=") {
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299 config.push(value.to_owned())
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300 }
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301
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302 if arg == b"--repository" || arg == b"-R" {
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303 if let Some(value) = args.next() {
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304 repo = Some(value)
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305 }
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306 } else if let Some(value) = arg.drop_prefix(b"--repository=") {
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307 repo = Some(value.to_owned())
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308 } else if let Some(value) = arg.drop_prefix(b"-R") {
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309 repo = Some(value.to_owned())
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310 }
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311 }
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312 Self { config, repo }
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313 }
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314 }
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315
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316 /// What to do when encountering some unsupported feature.
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317 ///
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318 /// See `HgError::UnsupportedFeature` and `CommandError::UnsupportedFeature`.
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319 enum OnUnsupported {
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320 /// Print an error message describing what feature is not supported,
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321 /// and exit with code 252.
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322 Abort,
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323 /// Silently exit with code 252.
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324 AbortSilent,
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325 /// Try running a Python implementation
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326 Fallback { executable: Vec<u8> },
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327 }
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328
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329 impl OnUnsupported {
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330 const DEFAULT: Self = OnUnsupported::Abort;
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331 const DEFAULT_FALLBACK_EXECUTABLE: &'static [u8] = b"hg";
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332
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333 fn from_config(config: &Config) -> Self {
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334 match config
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335 .get(b"rhg", b"on-unsupported")
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336 .map(|value| value.to_ascii_lowercase())
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337 .as_deref()
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338 {
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339 Some(b"abort") => OnUnsupported::Abort,
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340 Some(b"abort-silent") => OnUnsupported::AbortSilent,
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341 Some(b"fallback") => OnUnsupported::Fallback {
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342 executable: config
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343 .get(b"rhg", b"fallback-executable")
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344 .unwrap_or(Self::DEFAULT_FALLBACK_EXECUTABLE)
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345 .to_owned(),
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346 },
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347 None => Self::DEFAULT,
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348 Some(_) => {
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349 // TODO: warn about unknown config value
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350 Self::DEFAULT
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351 }
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352 }
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353 }
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354 }