Directly import rust-installer submodule

This moves the rust-installer code to be directly hosted in
rust-lang/rust, since it's not used elsewhere and this makes it easier
to make and review changes without needing a separate upstream commit.

Author: Mark-Simulacrum

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "src/rust-installer"]
-	path = src/tools/rust-installer
-	url = https://github.com/rust-lang/rust-installer.git
 [submodule "src/doc/nomicon"]
 	path = src/doc/nomicon
 	url = https://github.com/rust-lang/nomicon.git

src/tools/rust-installer

@@ -0,0 +1,5 @@
+*~
+tmp
+target/
+**/*.rs.bk
+Cargo.lock

src/tools/rust-installer/.gitignore

@@ -0,0 +1,28 @@
+[package]
+authors = ["The Rust Project Developers"]
+name = "installer"
+version = "0.0.0"
+edition = "2018"
+
+[[bin]]
+doc = false
+name = "rust-installer"
+path = "src/main.rs"
+
+[dependencies]
+anyhow = "1.0.19"
+flate2 = "1.0.1"
+rayon = "1.0"
+tar = "0.4.13"
+walkdir = "2"
+xz2 = "0.1.4"
+num_cpus = "1"
+remove_dir_all = "0.5"
+
+[dependencies.clap]
+features = ["derive"]
+version = "3.1"
+
+[target."cfg(windows)".dependencies]
+lazy_static = "1"
+winapi = { version = "0.3", features = ["errhandlingapi", "handleapi", "ioapiset", "winerror", "winioctl", "winnt"] }

src/tools/rust-installer/Cargo.toml

@@ -0,0 +1,71 @@
+[![Build Status](https://travis-ci.org/rust-lang/rust-installer.svg?branch=master)](https://travis-ci.org/rust-lang/rust-installer)
+
+A generator for the install.sh script commonly used to install Rust in
+Unix environments. It is used By Rust, Cargo, and is intended to be
+used by a future combined installer of Rust + Cargo.
+
+# Usage
+
+```
+./gen-installer.sh --product-name=Rust \
+                   --rel-manifest-dir=rustlib \
+                   --success-message=Rust-is-ready-to-roll. \
+                   --image-dir=./install-image \
+                   --work-dir=./temp \
+                   --output-dir=./dist \
+                   --non-installed-overlay=./overlay \
+                   --package-name=rustc-nightly-i686-apple-darwin \
+                   --component-name=rustc \
+                   --legacy-manifest-dirs=rustlib \
+                   --bulk-dirs=share/doc
+```
+
+Or, to just generate the script.
+
+```
+./gen-install-script.sh --product-name=Rust \
+                        --rel-manifest-dir=rustlib \
+                        --success-message=Rust-is-ready-to-roll. \
+                        --output-script=install.sh \
+                        --legacy-manifest-dirs=rustlib
+```
+
+*Note: the dashes in `success-message` are converted to spaces. The
+script's argument handling is broken with spaces.*
+
+To combine installers.
+
+```
+./combine-installers.sh --product-name=Rust \
+                        --rel-manifest-dir=rustlib \
+                        --success-message=Rust-is-ready-to-roll. \
+                        --work-dir=./temp \
+                        --output-dir=./dist \
+                        --non-installed-overlay=./overlay \
+                        --package-name=rustc-nightly-i686-apple-darwin \
+                        --legacy-manifest-dirs=rustlib \
+                        --input-tarballs=./rustc.tar.gz,cargo.tar.gz
+```
+
+# Future work
+
+* Make install.sh not have to be customized, pull it's data from a
+  config file.
+* Be more resiliant to installation failures, particularly if the disk
+  is full.
+* Pre-install and post-uninstall scripts.
+* Allow components to depend on or contradict other components.
+* Sanity check that expected destination dirs (bin, lib, share exist)?
+* Add --docdir flag. Is there a standard name for this?
+* Remove empty directories on uninstall.
+* Detect mismatches in --prefix, --mandir, etc. in follow-on
+  installs/uninstalls.
+* Fix argument handling for spaces.
+* Add --bindir.
+
+# License
+
+This software is distributed under the terms of both the MIT license
+and/or the Apache License (Version 2.0), at your option.
+
+See [LICENSE-APACHE](LICENSE-APACHE), [LICENSE-MIT](LICENSE-MIT) for details.

src/tools/rust-installer/README.md

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+set -ue
+
+# Prints the absolute path of a directory to stdout
+abs_path() {
+    local path="$1"
+    # Unset CDPATH because it causes havok: it makes the destination unpredictable
+    # and triggers 'cd' to print the path to stdout. Route `cd`'s output to /dev/null
+    # for good measure.
+    (unset CDPATH && cd "$path" > /dev/null && pwd)
+}
+
+src_dir="$(abs_path $(dirname "$0"))"
+cargo run --manifest-path="$src_dir/Cargo.toml" -- combine "$@"

src/tools/rust-installer/combine-installers.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+set -ue
+
+# Prints the absolute path of a directory to stdout
+abs_path() {
+    local path="$1"
+    # Unset CDPATH because it causes havok: it makes the destination unpredictable
+    # and triggers 'cd' to print the path to stdout. Route `cd`'s output to /dev/null
+    # for good measure.
+    (unset CDPATH && cd "$path" > /dev/null && pwd)
+}
+
+src_dir="$(abs_path $(dirname "$0"))"
+cargo run --manifest-path="$src_dir/Cargo.toml" -- script "$@"

src/tools/rust-installer/gen-install-script.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution and at
+# http://rust-lang.org/COPYRIGHT.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+set -ue
+
+# Prints the absolute path of a directory to stdout
+abs_path() {
+    local path="$1"
+    # Unset CDPATH because it causes havok: it makes the destination unpredictable
+    # and triggers 'cd' to print the path to stdout. Route `cd`'s output to /dev/null
+    # for good measure.
+    (unset CDPATH && cd "$path" > /dev/null && pwd)
+}
+
+src_dir="$(abs_path $(dirname "$0"))"
+cargo run --manifest-path="$src_dir/Cargo.toml" -- generate "$@"