install: add --profile flag to override profile

Previously, the profile to use when installing a new toolchain had to be
set globally through `rustup set profile`, or at rustup-init time.
Sometimes this is inconvenient, because you only want to use a
particular profile when installing a specific toolchain. This patch
allows users to pass `--profile` to `rustup install` to override the
profile used for that one install.

Fixes #2004.

src/cli/rustup_mode.rs

@@ -33,7 +33,7 @@ pub fn main() -> Result<()> {
     let matches = cli().get_matches();
     let verbose = matches.is_present("verbose");
     let quiet = matches.is_present("quiet");
-    let cfg = &common::set_globals(verbose, quiet)?;
+    let cfg = &mut common::set_globals(verbose, quiet)?;
 
     if maybe_upgrade_data(cfg, &matches)? {
         return Ok(());
@@ -89,8 +89,8 @@ pub fn main() -> Result<()> {
             (_, _) => unreachable!(),
         },
         ("set", Some(c)) => match c.subcommand() {
-            ("default-host", Some(m)) => set_default_host_triple(&cfg, m)?,
-            ("profile", Some(m)) => set_profile(&cfg, m)?,
+            ("default-host", Some(m)) => set_default_host_triple(cfg, m)?,
+            ("profile", Some(m)) => set_profile(cfg, m)?,
             (_, _) => unreachable!(),
         },
         ("completions", Some(c)) => {
@@ -169,6 +169,13 @@ pub fn cli() -> App<'static, 'static> {
                         .required(true)
                         .multiple(true),
                 )
+                .arg(
+                    Arg::with_name("profile")
+                        .long("profile")
+                        .takes_value(true)
+                        .possible_values(Profile::names())
+                        .required(false)
+                )
                 .arg(
                     Arg::with_name("no-self-update")
                         .help("Don't perform self-update when running the `rustup install` command")
@@ -258,6 +265,13 @@ pub fn cli() -> App<'static, 'static> {
                                 .required(true)
                                 .multiple(true),
                         )
+                        .arg(
+                            Arg::with_name("profile")
+                                .long("profile")
+                                .takes_value(true)
+                                .possible_values(Profile::names())
+                                .required(false)
+                        )
                         .arg(
                             Arg::with_name("no-self-update")
                                 .help("Don't perform self update when running the `rustup toolchain install` command")
@@ -772,8 +786,13 @@ fn check_updates(cfg: &Cfg) -> Result<()> {
     Ok(())
 }
 
-fn update(cfg: &Cfg, m: &ArgMatches<'_>) -> Result<()> {
+fn update(cfg: &mut Cfg, m: &ArgMatches<'_>) -> Result<()> {
     let self_update = !m.is_present("no-self-update") && !self_update::NEVER_SELF_UPDATE;
+    if let Some(p) = m.value_of("profile") {
+        let p = Profile::from_str(p)?;
+        cfg.set_profile_override(p);
+    }
+    let cfg = &cfg;
     if let Some(names) = m.values_of("toolchain") {
         for name in names {
             update_bare_triple_check(cfg, name)?;
@@ -1307,7 +1326,7 @@ fn set_default_host_triple(cfg: &Cfg, m: &ArgMatches<'_>) -> Result<()> {
     Ok(())
 }
 
-fn set_profile(cfg: &Cfg, m: &ArgMatches) -> Result<()> {
+fn set_profile(cfg: &mut Cfg, m: &ArgMatches) -> Result<()> {
     cfg.set_profile(&m.value_of("profile-name").unwrap())?;
     Ok(())
 }

src/cli/self_update.rs

@@ -746,7 +746,7 @@ fn maybe_install_rust(
     verbose: bool,
     quiet: bool,
 ) -> Result<()> {
-    let cfg = common::set_globals(verbose, quiet)?;
+    let mut cfg = common::set_globals(verbose, quiet)?;
     cfg.set_profile(profile_str)?;
 
     // If there is already an install, then `toolchain_str` may not be

src/config.rs

@@ -32,6 +32,7 @@ impl Display for OverrideReason {
 }
 
 pub struct Cfg {
+    pub profile_override: Option<dist::Profile>,
     pub rustup_dir: PathBuf,
     pub settings_file: SettingsFile,
     pub toolchains_dir: PathBuf,
@@ -94,6 +95,7 @@ impl Cfg {
         let dist_root = dist_root_server.clone() + "/dist";
 
         let cfg = Self {
+            profile_override: None,
             rustup_dir,
             settings_file,
             toolchains_dir,
@@ -116,6 +118,10 @@ impl Cfg {
         Ok(cfg)
     }
 
+    pub fn set_profile_override(&mut self, profile: dist::Profile) {
+        self.profile_override = Some(profile);
+    }
+
     pub fn set_default(&self, toolchain: &str) -> Result<()> {
         self.settings_file.with_mut(|s| {
             s.default_toolchain = Some(toolchain.to_owned());
@@ -125,10 +131,11 @@ impl Cfg {
         Ok(())
     }
 
-    pub fn set_profile(&self, profile: &str) -> Result<()> {
+    pub fn set_profile(&mut self, profile: &str) -> Result<()> {
         if !dist::Profile::names().contains(&profile) {
             return Err(ErrorKind::UnknownProfile(profile.to_owned()).into());
         }
+        self.profile_override = None;
         self.settings_file.with_mut(|s| {
             s.profile = Some(profile.to_owned());
             Ok(())
@@ -145,6 +152,9 @@ impl Cfg {
     // a user upgrades from a version of Rustup without profiles to a version of
     // Rustup with profiles.
     pub fn get_profile(&self) -> Result<dist::Profile> {
+        if let Some(p) = self.profile_override {
+            return Ok(p);
+        }
         self.settings_file.with(|s| {
             let p = match &s.profile {
                 Some(p) => p,

tests/cli-v2.rs

@@ -4,8 +4,9 @@
 pub mod mock;
 
 use crate::mock::clitools::{
-    self, expect_err, expect_not_stderr_ok, expect_not_stdout_ok, expect_ok, expect_ok_ex,
-    expect_stderr_ok, expect_stdout_ok, set_current_dist_date, this_host_triple, Config, Scenario,
+    self, expect_component_executable, expect_component_not_executable, expect_err,
+    expect_not_stderr_ok, expect_not_stdout_ok, expect_ok, expect_ok_ex, expect_stderr_ok,
+    expect_stdout_ok, set_current_dist_date, this_host_triple, Config, Scenario,
 };
 use std::fs;
 use std::io::Write;
@@ -73,6 +74,42 @@ fn install_toolchain_from_version() {
     });
 }
 
+#[test]
+fn install_with_profile() {
+    setup_complex(&|config| {
+        // Start with a config that uses the "complete" profile
+        set_current_dist_date(config, "2015-01-01");
+        expect_ok(config, &["rustup", "set", "profile", "complete"]);
+
+        // Installing with minimal profile should only install rustc
+        expect_ok(
+            config,
+            &[
+                "rustup",
+                "toolchain",
+                "install",
+                "--profile",
+                "minimal",
+                "nightly",
+                "--no-self-update",
+            ],
+        );
+        expect_ok(config, &["rustup", "default", "nightly"]);
+
+        expect_component_executable(config, "rustup");
+        expect_component_executable(config, "rustc");
+        expect_component_not_executable(config, "cargo");
+
+        // After an update, we should _still_ only have the profile-dictated components
+        set_current_dist_date(config, "2015-01-02");
+        expect_ok(config, &["rustup", "update", "nightly", "--no-self-update"]);
+
+        expect_component_executable(config, "rustup");
+        expect_component_executable(config, "rustc");
+        expect_component_not_executable(config, "cargo");
+    });
+}
+
 #[test]
 fn default_existing_toolchain() {
     setup(&|config| {