annotate rust/rhg/src/main.rs @ 46736:2255e7eb39e5

rhg: Add support for --cwd This affect the meaning of relative paths in `--repository`, which are resolved "early" by rhg in order to load config which is needed before fallback to Python is considered. An incorrect path could cause errors when loading a non-existent repo, leading to failing tests even when fallback is enabled. Differential Revision: https://phab.mercurial-scm.org/D10134
author Simon Sapin <simon.sapin@octobus.net>
date Fri, 05 Mar 2021 11:21:15 +0100
parents 1a036d33bc18
children b1f2c2b336ec
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, join};
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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 check_extensions(config)?;
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29
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30 let app = App::new("rhg")
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31 .global_setting(AppSettings::AllowInvalidUtf8)
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32 .setting(AppSettings::SubcommandRequired)
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33 .setting(AppSettings::VersionlessSubcommands)
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34 .arg(
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35 Arg::with_name("repository")
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36 .help("repository root directory")
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37 .short("-R")
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38 .long("--repository")
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39 .value_name("REPO")
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40 .takes_value(true)
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41 // Both ok: `hg -R ./foo log` or `hg log -R ./foo`
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42 .global(true),
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43 )
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44 .arg(
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45 Arg::with_name("config")
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46 .help("set/override config option (use 'section.name=value')")
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47 .long("--config")
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48 .value_name("CONFIG")
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49 .takes_value(true)
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50 .global(true)
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51 // Ok: `--config section.key1=val --config section.key2=val2`
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52 .multiple(true)
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53 // Not ok: `--config section.key1=val section.key2=val2`
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54 .number_of_values(1),
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55 )
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56 .arg(
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57 Arg::with_name("cwd")
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58 .help("change working directory")
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59 .long("--cwd")
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60 .value_name("DIR")
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61 .takes_value(true)
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62 .global(true),
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63 )
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64 .version("0.0.1");
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65 let app = add_subcommand_args(app);
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66
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67 let matches = app.clone().get_matches_safe()?;
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68
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69 let (subcommand_name, subcommand_matches) = matches.subcommand();
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70 let run = subcommand_run_fn(subcommand_name)
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71 .expect("unknown subcommand name from clap despite AppSettings::SubcommandRequired");
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72 let subcommand_args = subcommand_matches
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73 .expect("no subcommand arguments from clap despite AppSettings::SubcommandRequired");
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74
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75 let invocation = CliInvocation {
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76 ui,
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77 subcommand_args,
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78 config,
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79 repo,
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80 };
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81 let blackbox = blackbox::Blackbox::new(&invocation, process_start_time)?;
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82 blackbox.log_command_start();
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83 let result = run(&invocation);
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84 blackbox.log_command_end(exit_code(&result));
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85 result
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86 }
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87
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88 fn main() {
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89 // Run this first, before we find out if the blackbox extension is even
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90 // enabled, in order to include everything in-between in the duration
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91 // measurements. Reading config files can be slow if they’re on NFS.
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92 let process_start_time = blackbox::ProcessStartTime::now();
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93
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94 env_logger::init();
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95 let ui = ui::Ui::new();
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96
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97 let early_args = EarlyArgs::parse(std::env::args_os());
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98
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99 let initial_current_dir = early_args.cwd.map(|cwd| {
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100 let cwd = get_path_from_bytes(&cwd);
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101 std::env::current_dir()
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102 .and_then(|initial| {
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103 std::env::set_current_dir(cwd)?;
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104 Ok(initial)
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105 })
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106 .unwrap_or_else(|error| {
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107 exit(
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108 &None,
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109 &ui,
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110 OnUnsupported::Abort,
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111 Err(CommandError::abort(format!(
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112 "abort: {}: '{}'",
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113 error,
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114 cwd.display()
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115 ))),
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116 )
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117 })
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118 });
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119
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120 let non_repo_config =
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121 Config::load(early_args.config).unwrap_or_else(|error| {
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122 // Normally this is decided based on config, but we don’t have that
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123 // available. As of this writing config loading never returns an
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124 // "unsupported" error but that is not enforced by the type system.
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125 let on_unsupported = OnUnsupported::Abort;
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126
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127 exit(&initial_current_dir, &ui, on_unsupported, Err(error.into()))
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128 });
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129
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130 if let Some(repo_path_bytes) = &early_args.repo {
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131 lazy_static::lazy_static! {
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132 static ref SCHEME_RE: regex::bytes::Regex =
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133 // Same as `_matchscheme` in `mercurial/util.py`
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134 regex::bytes::Regex::new("^[a-zA-Z0-9+.\\-]+:").unwrap();
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135 }
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136 if SCHEME_RE.is_match(&repo_path_bytes) {
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137 exit(
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138 &initial_current_dir,
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139 &ui,
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140 OnUnsupported::from_config(&non_repo_config),
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141 Err(CommandError::UnsupportedFeature {
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142 message: format_bytes!(
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143 b"URL-like --repository {}",
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144 repo_path_bytes
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145 ),
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146 }),
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147 )
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148 }
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149 }
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150 let repo_path = early_args.repo.as_deref().map(get_path_from_bytes);
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151 let repo_result = match Repo::find(&non_repo_config, repo_path) {
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152 Ok(repo) => Ok(repo),
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153 Err(RepoError::NotFound { at }) if repo_path.is_none() => {
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154 // Not finding a repo is not fatal yet, if `-R` was not given
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155 Err(NoRepoInCwdError { cwd: at })
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156 }
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157 Err(error) => exit(
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158 &initial_current_dir,
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159 &ui,
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160 OnUnsupported::from_config(&non_repo_config),
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161 Err(error.into()),
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162 ),
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163 };
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164
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165 let config = if let Ok(repo) = &repo_result {
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166 repo.config()
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167 } else {
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168 &non_repo_config
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169 };
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170
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171 let result = main_with_result(
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172 &process_start_time,
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173 &ui,
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174 repo_result.as_ref(),
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175 config,
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176 );
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177 exit(
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178 &initial_current_dir,
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179 &ui,
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180 OnUnsupported::from_config(config),
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181 result,
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182 )
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183 }
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184
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185 fn exit_code(result: &Result<(), CommandError>) -> i32 {
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186 match result {
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187 Ok(()) => exitcode::OK,
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188 Err(CommandError::Abort { .. }) => exitcode::ABORT,
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189
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190 // Exit with a specific code and no error message to let a potential
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191 // wrapper script fallback to Python-based Mercurial.
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192 Err(CommandError::UnsupportedFeature { .. }) => {
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193 exitcode::UNIMPLEMENTED
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194 }
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195 }
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196 }
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197
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198 fn exit(
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199 initial_current_dir: &Option<PathBuf>,
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200 ui: &Ui,
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201 mut on_unsupported: OnUnsupported,
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202 result: Result<(), CommandError>,
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203 ) -> ! {
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204 if let (
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205 OnUnsupported::Fallback { executable },
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206 Err(CommandError::UnsupportedFeature { .. }),
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207 ) = (&on_unsupported, &result)
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208 {
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209 let mut args = std::env::args_os();
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210 let executable_path = get_path_from_bytes(&executable);
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211 let this_executable = args.next().expect("exepcted argv[0] to exist");
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212 if executable_path == &PathBuf::from(this_executable) {
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213 // Avoid spawning infinitely many processes until resource
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214 // exhaustion.
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215 let _ = ui.write_stderr(&format_bytes!(
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216 b"Blocking recursive fallback. The 'rhg.fallback-executable = {}' config \
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217 points to `rhg` itself.\n",
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218 executable
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219 ));
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220 on_unsupported = OnUnsupported::Abort
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221 } else {
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222 // `args` is now `argv[1..]` since we’ve already consumed `argv[0]`
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223 let mut command = Command::new(executable_path);
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224 command.args(args);
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225 if let Some(initial) = initial_current_dir {
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226 command.current_dir(initial);
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227 }
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228 let result = command.status();
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229 match result {
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230 Ok(status) => std::process::exit(
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231 status.code().unwrap_or(exitcode::ABORT),
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232 ),
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233 Err(error) => {
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234 let _ = ui.write_stderr(&format_bytes!(
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235 b"tried to fall back to a '{}' sub-process but got error {}\n",
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236 executable, format_bytes::Utf8(error)
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237 ));
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238 on_unsupported = OnUnsupported::Abort
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239 }
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240 }
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241 }
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242 }
46666
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243 match &result {
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244 Ok(_) => {}
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245 Err(CommandError::Abort { message }) => {
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246 if !message.is_empty() {
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247 // Ignore errors when writing to stderr, we’re already exiting
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248 // with failure code so there’s not much more we can do.
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249 let _ = ui.write_stderr(&format_bytes!(b"{}\n", message));
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250 }
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251 }
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252 Err(CommandError::UnsupportedFeature { message }) => {
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253 match on_unsupported {
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254 OnUnsupported::Abort => {
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255 let _ = ui.write_stderr(&format_bytes!(
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256 b"unsupported feature: {}\n",
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257 message
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258 ));
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259 }
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260 OnUnsupported::AbortSilent => {}
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261 OnUnsupported::Fallback { .. } => unreachable!(),
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262 }
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263 }
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264 }
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265 std::process::exit(exit_code(&result))
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266 }
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267
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268 macro_rules! subcommands {
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269 ($( $command: ident )+) => {
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270 mod commands {
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271 $(
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272 pub mod $command;
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273 )+
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274 }
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275
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276 fn add_subcommand_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
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277 app
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278 $(
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279 .subcommand(commands::$command::args())
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280 )+
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281 }
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282
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283 pub type RunFn = fn(&CliInvocation) -> Result<(), CommandError>;
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284
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285 fn subcommand_run_fn(name: &str) -> Option<RunFn> {
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286 match name {
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287 $(
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288 stringify!($command) => Some(commands::$command::run),
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289 )+
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290 _ => None,
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291 }
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292 }
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293 };
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294 }
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295
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296 subcommands! {
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297 cat
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298 debugdata
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299 debugrequirements
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300 files
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301 root
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302 config
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303 }
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304 pub struct CliInvocation<'a> {
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305 ui: &'a Ui,
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306 subcommand_args: &'a ArgMatches<'a>,
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307 config: &'a Config,
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308 /// References inside `Result` is a bit peculiar but allow
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309 /// `invocation.repo?` to work out with `&CliInvocation` since this
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310 /// `Result` type is `Copy`.
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311 repo: Result<&'a Repo, &'a NoRepoInCwdError>,
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312 }
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313
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314 struct NoRepoInCwdError {
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315 cwd: PathBuf,
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316 }
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317
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318 /// CLI arguments to be parsed "early" in order to be able to read
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319 /// configuration before using Clap. Ideally we would also use Clap for this,
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320 /// see <https://github.com/clap-rs/clap/discussions/2366>.
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321 ///
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322 /// These arguments are still declared when we do use Clap later, so that Clap
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323 /// does not return an error for their presence.
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324 struct EarlyArgs {
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325 /// Values of all `--config` arguments. (Possibly none)
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326 config: Vec<Vec<u8>>,
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327 /// Value of the `-R` or `--repository` argument, if any.
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328 repo: Option<Vec<u8>>,
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329 /// Value of the `--cwd` argument, if any.
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330 cwd: Option<Vec<u8>>,
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331 }
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332
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333 impl EarlyArgs {
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334 fn parse(args: impl IntoIterator<Item = OsString>) -> Self {
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335 let mut args = args.into_iter().map(get_bytes_from_os_str);
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336 let mut config = Vec::new();
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337 let mut repo = None;
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338 let mut cwd = None;
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339 // Use `while let` instead of `for` so that we can also call
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340 // `args.next()` inside the loop.
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341 while let Some(arg) = args.next() {
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342 if arg == b"--config" {
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343 if let Some(value) = args.next() {
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344 config.push(value)
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345 }
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346 } else if let Some(value) = arg.drop_prefix(b"--config=") {
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347 config.push(value.to_owned())
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348 }
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349
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350 if arg == b"--cwd" {
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351 if let Some(value) = args.next() {
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352 cwd = Some(value)
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353 }
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354 } else if let Some(value) = arg.drop_prefix(b"--cwd=") {
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355 cwd = Some(value.to_owned())
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356 }
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357
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358 if arg == b"--repository" || arg == b"-R" {
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359 if let Some(value) = args.next() {
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360 repo = Some(value)
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361 }
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362 } else if let Some(value) = arg.drop_prefix(b"--repository=") {
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363 repo = Some(value.to_owned())
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364 } else if let Some(value) = arg.drop_prefix(b"-R") {
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365 repo = Some(value.to_owned())
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366 }
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367 }
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368 Self { config, repo, cwd }
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369 }
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370 }
46666
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371
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372 /// What to do when encountering some unsupported feature.
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373 ///
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374 /// See `HgError::UnsupportedFeature` and `CommandError::UnsupportedFeature`.
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375 enum OnUnsupported {
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376 /// Print an error message describing what feature is not supported,
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377 /// and exit with code 252.
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378 Abort,
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379 /// Silently exit with code 252.
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380 AbortSilent,
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381 /// Try running a Python implementation
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382 Fallback { executable: Vec<u8> },
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383 }
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384
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385 impl OnUnsupported {
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386 const DEFAULT: Self = OnUnsupported::Abort;
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387 const DEFAULT_FALLBACK_EXECUTABLE: &'static [u8] = b"hg";
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388
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389 fn from_config(config: &Config) -> Self {
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390 match config
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391 .get(b"rhg", b"on-unsupported")
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392 .map(|value| value.to_ascii_lowercase())
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393 .as_deref()
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394 {
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395 Some(b"abort") => OnUnsupported::Abort,
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396 Some(b"abort-silent") => OnUnsupported::AbortSilent,
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397 Some(b"fallback") => OnUnsupported::Fallback {
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398 executable: config
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399 .get(b"rhg", b"fallback-executable")
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400 .unwrap_or(Self::DEFAULT_FALLBACK_EXECUTABLE)
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401 .to_owned(),
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402 },
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403 None => Self::DEFAULT,
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404 Some(_) => {
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405 // TODO: warn about unknown config value
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406 Self::DEFAULT
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407 }
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408 }
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409 }
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410 }
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411
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412 const SUPPORTED_EXTENSIONS: &[&[u8]] = &[b"blackbox", b"share"];
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413
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414 fn check_extensions(config: &Config) -> Result<(), CommandError> {
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415 let enabled = config.get_section_keys(b"extensions");
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416
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417 let mut unsupported = enabled;
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418 for supported in SUPPORTED_EXTENSIONS {
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419 unsupported.remove(supported);
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420 }
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421
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422 if let Some(ignored_list) =
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423 config.get_simple_list(b"rhg", b"ignored-extensions")
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424 {
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425 for ignored in ignored_list {
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426 unsupported.remove(ignored);
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427 }
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428 }
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429
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430 if unsupported.is_empty() {
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431 Ok(())
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432 } else {
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433 Err(CommandError::UnsupportedFeature {
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434 message: format_bytes!(
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435 b"extensions: {} (consider adding them to 'rhg.ignored-extensions' config)",
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436 join(unsupported, b", ")
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437 ),
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438 })
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439 }
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440 }