Allow passing a registry index url directly to cargo install

src/bin/cargo/commands/install.rs

@@ -18,7 +18,7 @@ pub fn cli() -> App {
         .arg(
             opt("git", "Git URL to install the specified crate from")
                 .value_name("URL")
-                .conflicts_with_all(&["path", "registry"]),
+                .conflicts_with_all(&["path", "index", "registry"]),
         )
         .arg(
             opt("branch", "Branch to use when installing from git")
@@ -38,7 +38,7 @@ pub fn cli() -> App {
         .arg(
             opt("path", "Filesystem path to local crate to install")
                 .value_name("PATH")
-                .conflicts_with_all(&["git", "registry"]),
+                .conflicts_with_all(&["git", "index", "registry"]),
         )
         .arg(opt(
             "list",
@@ -58,11 +58,17 @@ pub fn cli() -> App {
         )
         .arg_target_triple("Build for the target triple")
         .arg(opt("root", "Directory to install packages into").value_name("DIR"))
+        .arg(
+            opt("index", "Registry index to install from")
+                .value_name("INDEX")
+                .requires("crate")
+                .conflicts_with_all(&["git", "path", "registry"]),
+        )
         .arg(
             opt("registry", "Registry to use")
                 .value_name("REGISTRY")
                 .requires("crate")
-                .conflicts_with_all(&["git", "path"]),
+                .conflicts_with_all(&["git", "path", "index"]),
         )
         .after_help(
             "\
@@ -100,8 +106,6 @@ continuous integration systems.",
 }
 
 pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
-    let registry = args.registry(config)?;
-
     if let Some(path) = args.value_of_path("path", config) {
         config.reload_rooted_at(path)?;
     } else {
@@ -143,8 +147,10 @@ pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
     } else if krates.is_empty() {
         from_cwd = true;
         SourceId::for_path(config.cwd())?
-    } else if let Some(registry) = registry {
+    } else if let Some(registry) = args.registry(config)? {
         SourceId::alt_registry(config, &registry)?
+    } else if let Some(index) = args.value_of("index") {
+        SourceId::for_registry(&index.into_url()?)?
     } else {
         SourceId::crates_io(config)?
     };

src/doc/man/cargo-install.adoc

@@ -135,6 +135,8 @@ available.
 
 include::options-registry.adoc[]
 
+include::options-index.adoc[]
+
 include::options-features.adoc[]
 
 === Compilation Options

src/doc/man/generated/cargo-install.html

@@ -197,6 +197,10 @@ <h3 id="cargo_install_install_options">Install Options</h3>
 If not specified, the default registry is used, which is defined by the
 <code>registry.default</code> config key which defaults to <code>crates-io</code>.</p>
 </dd>
+<dt class="hdlist1"><strong>--index</strong> <em>INDEX</em></dt>
+<dd>
+<p>The URL of the registry index to use.</p>
+</dd>
 </dl>
 </div>
 </div>

src/etc/man/cargo-install.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-install
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 2.0.10
-.\"      Date: 2020-02-06
+.\"      Date: 2020-06-14
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-INSTALL" "1" "2020-02-06" "\ \&" "\ \&"
+.TH "CARGO\-INSTALL" "1" "2020-06-14" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -293,6 +293,11 @@ Name of the registry to use. Registry names are defined in \c
 If not specified, the default registry is used, which is defined by the
 \fBregistry.default\fP config key which defaults to \fBcrates\-io\fP.
 .RE
+.sp
+\fB\-\-index\fP \fIINDEX\fP
+.RS 4
+The URL of the registry index to use.
+.RE
 .SS "Feature Selection"
 .sp
 The feature flags allow you to control the enabled features for the "current"

tests/testsuite/install.rs

@@ -9,7 +9,7 @@ use cargo_test_support::install::{
     assert_has_installed_exe, assert_has_not_installed_exe, cargo_home,
 };
 use cargo_test_support::paths;
-use cargo_test_support::registry::Package;
+use cargo_test_support::registry::{registry_path, registry_url, Package};
 use cargo_test_support::{
     basic_manifest, cargo_process, no_such_file_err_msg, project, symlink_supported, t,
 };
@@ -51,6 +51,35 @@ fn simple() {
     assert_has_not_installed_exe(cargo_home(), "foo");
 }
 
+#[cargo_test]
+fn with_index() {
+    pkg("foo", "0.0.1");
+
+    cargo_process("install foo --index")
+        .arg(registry_url().to_string())
+        .with_stderr(&format!(
+            "\
+[UPDATING] `{reg}` index
+[DOWNLOADING] crates ...
+[DOWNLOADED] foo v0.0.1 (registry `{reg}`)
+[INSTALLING] foo v0.0.1 (registry `{reg}`)
+[COMPILING] foo v0.0.1 (registry `{reg}`)
+[FINISHED] release [optimized] target(s) in [..]
+[INSTALLING] [CWD]/home/.cargo/bin/foo[EXE]
+[INSTALLED] package `foo v0.0.1 (registry `{reg}`)` (executable `foo[EXE]`)
+[WARNING] be sure to add `[..]` to your PATH to be able to run the installed binaries
+",
+            reg = registry_path().to_str().unwrap()
+        ))
+        .run();
+    assert_has_installed_exe(cargo_home(), "foo");
+
+    cargo_process("uninstall foo")
+        .with_stderr("[REMOVING] [CWD]/home/.cargo/bin/foo[EXE]")
+        .run();
+    assert_has_not_installed_exe(cargo_home(), "foo");
+}
+
 #[cargo_test]
 fn multiple_pkgs() {
     pkg("foo", "0.0.1");