chore(xtask): Add core cargo flags

Author: epage

Cargo.lock

@@ -5,3 +5,7 @@ edition = "2021"
 publish = false
 
 [dependencies]
+anyhow = "1.0.47"
+cargo = { version = "0.71.0", path = "../.." }
+clap = "4.2.0"
+env_logger = "0.10.0"

crates/xtask/Cargo.toml

@@ -1,3 +1,15 @@
+mod xtask;
+
 fn main() {
-    println!("Hello, world!");
+    env_logger::init_from_env("CARGO_LOG");
+    let cli = xtask::cli();
+    let matches = cli.get_matches();
+
+    let mut config = cargo::util::config::Config::default().unwrap_or_else(|e| {
+        let mut eval = cargo::core::shell::Shell::new();
+        cargo::exit_with_error(e.into(), &mut eval)
+    });
+    if let Err(e) = xtask::exec(&matches, &mut config) {
+        cargo::exit_with_error(e, &mut config.shell())
+    }
 }

crates/xtask/src/main.rs

@@ -0,0 +1,69 @@
+use cargo::util::command_prelude::*;
+
+pub fn cli() -> clap::Command {
+    clap::Command::new("xtask")
+        .arg(
+            opt(
+                "verbose",
+                "Use verbose output (-vv very verbose/build.rs output)",
+            )
+            .short('v')
+            .action(ArgAction::Count)
+            .global(true),
+        )
+        .arg_quiet()
+        .arg(
+            opt("color", "Coloring: auto, always, never")
+                .value_name("WHEN")
+                .global(true),
+        )
+        .arg(flag("frozen", "Require Cargo.lock and cache are up to date").global(true))
+        .arg(flag("locked", "Require Cargo.lock is up to date").global(true))
+        .arg(flag("offline", "Run without accessing the network").global(true))
+        .arg(multi_opt("config", "KEY=VALUE", "Override a configuration value").global(true))
+        .arg(
+            Arg::new("unstable-features")
+                .help("Unstable (nightly-only) flags to Cargo, see 'cargo -Z help' for details")
+                .short('Z')
+                .value_name("FLAG")
+                .action(ArgAction::Append)
+                .global(true),
+        )
+}
+
+pub fn exec(args: &clap::ArgMatches, config: &mut cargo::util::Config) -> cargo::CliResult {
+    config_configure(config, args)?;
+
+    Ok(())
+}
+
+fn config_configure(config: &mut Config, args: &ArgMatches) -> CliResult {
+    let verbose = args.verbose();
+    // quiet is unusual because it is redefined in some subcommands in order
+    // to provide custom help text.
+    let quiet = args.flag("quiet");
+    let color = args.get_one::<String>("color").map(String::as_str);
+    let frozen = args.flag("frozen");
+    let locked = args.flag("locked");
+    let offline = args.flag("offline");
+    let mut unstable_flags = vec![];
+    if let Some(values) = args.get_many::<String>("unstable-features") {
+        unstable_flags.extend(values.cloned());
+    }
+    let mut config_args = vec![];
+    if let Some(values) = args.get_many::<String>("config") {
+        config_args.extend(values.cloned());
+    }
+    config.configure(
+        verbose,
+        quiet,
+        color,
+        frozen,
+        locked,
+        offline,
+        &None,
+        &unstable_flags,
+        &config_args,
+    )?;
+    Ok(())
+}