// Copyright 2016 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.

//! Implementation of the various distribution aspects of the compiler.
//!
//! This module is responsible for creating tarballs of the standard library,
//! compiler, and documentation. This ends up being what we distribute to
//! everyone as well.
//!
//! No tarball is actually created literally in this file, but rather we shell
//! out to `rust-installer` still. This may one day be replaced with bits and
//! pieces of `rustup.rs`!

use std::env;
use std::fs::{self, File};
use std::io::{Read, Write};
use std::path::{PathBuf, Path};
use std::process::{Command, Stdio};

use build_helper::output;

use {Compiler, Mode, LLVM_TOOLS};
use channel;
use util::{libdir, is_dylib, exe};
use builder::{Builder, RunConfig, ShouldRun, Step};
use compile;
use tool::{self, Tool};
use cache::{INTERNER, Interned};
use time;

pub fn pkgname(builder: &Builder, component: &str) -> String {
    if component == "cargo" {
        format!("{}-{}", component, builder.cargo_package_vers())
    } else if component == "rls" {
        format!("{}-{}", component, builder.rls_package_vers())
    } else if component == "clippy" {
        format!("{}-{}", component, builder.clippy_package_vers())
    } else if component == "rustfmt" {
        format!("{}-{}", component, builder.rustfmt_package_vers())
    } else if component == "llvm-tools" {
        format!("{}-{}", component, builder.llvm_tools_package_vers())
    } else if component == "lldb" {
        format!("{}-{}", component, builder.lldb_package_vers())
    } else {
        assert!(component.starts_with("rust"));
        format!("{}-{}", component, builder.rust_package_vers())
    }
}

fn distdir(builder: &Builder) -> PathBuf {
    builder.out.join("dist")
}

pub fn tmpdir(builder: &Builder) -> PathBuf {
    builder.out.join("tmp/dist")
}

fn rust_installer(builder: &Builder) -> Command {
    builder.tool_cmd(Tool::RustInstaller)
}

fn missing_tool(tool_name: &str, skip: bool) {
    if skip {
        println!("Unable to build {}, skipping dist", tool_name)
    } else {
        panic!("Unable to build {}", tool_name)
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Docs {
    pub stage: u32,
    pub host: Interned<String>,
}

impl Step for Docs {
    type Output = PathBuf;
    const DEFAULT: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("src/doc")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Docs {
            stage: run.builder.top_stage,
            host: run.target,
        });
    }

    /// Builds the `rust-docs` installer component.
    fn run(self, builder: &Builder) -> PathBuf {
        let host = self.host;

        let name = pkgname(builder, "rust-docs");

        builder.info(&format!("Dist docs ({})", host));
        if !builder.config.docs {
            builder.info("\tskipping - docs disabled");
            return distdir(builder).join(format!("{}-{}.tar.gz", name, host));
        }

        builder.default_doc(None);

        let image = tmpdir(builder).join(format!("{}-{}-image", name, host));
        let _ = fs::remove_dir_all(&image);

        let dst = image.join("share/doc/rust/html");
        t!(fs::create_dir_all(&dst));
        let src = builder.doc_out(host);
        builder.cp_r(&src, &dst);

        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust-Documentation")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=Rust-documentation-is-installed.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg(format!("--package-name={}-{}", name, host))
           .arg("--component-name=rust-docs")
           .arg("--legacy-manifest-dirs=rustlib,cargo")
           .arg("--bulk-dirs=share/doc/rust/html");
        builder.run(&mut cmd);
        builder.remove_dir(&image);

        distdir(builder).join(format!("{}-{}.tar.gz", name, host))
    }
}

#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub struct RustcDocs {
    pub stage: u32,
    pub host: Interned<String>,
}

impl Step for RustcDocs {
    type Output = PathBuf;
    const DEFAULT: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("src/librustc")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(RustcDocs {
            stage: run.builder.top_stage,
            host: run.target,
        });
    }

    /// Builds the `rustc-docs` installer component.
    fn run(self, builder: &Builder) -> PathBuf {
        let host = self.host;

        let name = pkgname(builder, "rustc-docs");

        builder.info(&format!("Dist compiler docs ({})", host));
        if !builder.config.compiler_docs {
            builder.info("\tskipping - compiler docs disabled");
            return distdir(builder).join(format!("{}-{}.tar.gz", name, host));
        }

        builder.default_doc(None);

        let image = tmpdir(builder).join(format!("{}-{}-image", name, host));
        let _ = fs::remove_dir_all(&image);

        let dst = image.join("share/doc/rust/html");
        t!(fs::create_dir_all(&dst));
        let src = builder.compiler_doc_out(host);
        builder.cp_r(&src, &dst);

        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rustc-Documentation")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=Rustc-documentation-is-installed.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg(format!("--package-name={}-{}", name, host))
           .arg("--component-name=rustc-docs")
           .arg("--legacy-manifest-dirs=rustlib,cargo")
           .arg("--bulk-dirs=share/doc/rust/html");
        builder.run(&mut cmd);
        builder.remove_dir(&image);

        distdir(builder).join(format!("{}-{}.tar.gz", name, host))
    }
}

fn find_files(files: &[&str], path: &[PathBuf]) -> Vec<PathBuf> {
    let mut found = Vec::with_capacity(files.len());

    for file in files {
        let file_path =
            path.iter()
                .map(|dir| dir.join(file))
                .find(|p| p.exists());

        if let Some(file_path) = file_path {
            found.push(file_path);
        } else {
            panic!("Could not find '{}' in {:?}", file, path);
        }
    }

    found
}

fn make_win_dist(
    rust_root: &Path, plat_root: &Path, target_triple: Interned<String>, builder: &Builder
) {
    //Ask gcc where it keeps its stuff
    let mut cmd = Command::new(builder.cc(target_triple));
    cmd.arg("-print-search-dirs");
    let gcc_out = output(&mut cmd);

    let mut bin_path: Vec<_> = env::split_paths(&env::var_os("PATH").unwrap_or_default()).collect();
    let mut lib_path = Vec::new();

    for line in gcc_out.lines() {
        let idx = line.find(':').unwrap();
        let key = &line[..idx];
        let trim_chars: &[_] = &[' ', '='];
        let value =
            line[(idx + 1)..]
                .trim_left_matches(trim_chars)
                .split(';')
                .map(PathBuf::from);

        if key == "programs" {
            bin_path.extend(value);
        } else if key == "libraries" {
            lib_path.extend(value);
        }
    }

    let target_tools = ["gcc.exe", "ld.exe", "dlltool.exe", "libwinpthread-1.dll"];
    let mut rustc_dlls = vec!["libstdc++-6.dll", "libwinpthread-1.dll"];
    if target_triple.starts_with("i686-") {
        rustc_dlls.push("libgcc_s_dw2-1.dll");
    } else {
        rustc_dlls.push("libgcc_s_seh-1.dll");
    }

    let target_libs = [ //MinGW libs
        "libgcc.a",
        "libgcc_eh.a",
        "libgcc_s.a",
        "libm.a",
        "libmingw32.a",
        "libmingwex.a",
        "libstdc++.a",
        "libiconv.a",
        "libmoldname.a",
        "libpthread.a",
        //Windows import libs
        "libadvapi32.a",
        "libbcrypt.a",
        "libcomctl32.a",
        "libcomdlg32.a",
        "libcredui.a",
        "libcrypt32.a",
        "libdbghelp.a",
        "libgdi32.a",
        "libimagehlp.a",
        "libiphlpapi.a",
        "libkernel32.a",
        "libmsimg32.a",
        "libmsvcrt.a",
        "libodbc32.a",
        "libole32.a",
        "liboleaut32.a",
        "libopengl32.a",
        "libpsapi.a",
        "librpcrt4.a",
        "libsecur32.a",
        "libsetupapi.a",
        "libshell32.a",
        "libsynchronization.a",
        "libuser32.a",
        "libuserenv.a",
        "libuuid.a",
        "libwinhttp.a",
        "libwinmm.a",
        "libwinspool.a",
        "libws2_32.a",
        "libwsock32.a",
    ];

    //Find mingw artifacts we want to bundle
    let target_tools = find_files(&target_tools, &bin_path);
    let rustc_dlls = find_files(&rustc_dlls, &bin_path);
    let target_libs = find_files(&target_libs, &lib_path);

    // Copy runtime dlls next to rustc.exe
    let dist_bin_dir = rust_root.join("bin/");
    fs::create_dir_all(&dist_bin_dir).expect("creating dist_bin_dir failed");
    for src in rustc_dlls {
        builder.copy_to_folder(&src, &dist_bin_dir);
    }

    //Copy platform tools to platform-specific bin directory
    let target_bin_dir = plat_root.join("lib").join("rustlib").join(target_triple).join("bin");
    fs::create_dir_all(&target_bin_dir).expect("creating target_bin_dir failed");
    for src in target_tools {
        builder.copy_to_folder(&src, &target_bin_dir);
    }

    // Warn windows-gnu users that the bundled GCC cannot compile C files
    builder.create(
        &target_bin_dir.join("GCC-WARNING.txt"),
        "gcc.exe contained in this folder cannot be used for compiling C files - it is only\
         used as a linker. In order to be able to compile projects containing C code use\
         the GCC provided by MinGW or Cygwin."
    );

    //Copy platform libs to platform-specific lib directory
    let target_lib_dir = plat_root.join("lib").join("rustlib").join(target_triple).join("lib");
    fs::create_dir_all(&target_lib_dir).expect("creating target_lib_dir failed");
    for src in target_libs {
        builder.copy_to_folder(&src, &target_lib_dir);
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Mingw {
    pub host: Interned<String>,
}

impl Step for Mingw {
    type Output = Option<PathBuf>;
    const DEFAULT: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.never()
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Mingw { host: run.target });
    }

    /// Build the `rust-mingw` installer component.
    ///
    /// This contains all the bits and pieces to run the MinGW Windows targets
    /// without any extra installed software (e.g. we bundle gcc, libraries, etc).
    fn run(self, builder: &Builder) -> Option<PathBuf> {
        let host = self.host;

        if !host.contains("pc-windows-gnu") {
            return None;
        }

        builder.info(&format!("Dist mingw ({})", host));
        let name = pkgname(builder, "rust-mingw");
        let image = tmpdir(builder).join(format!("{}-{}-image", name, host));
        let _ = fs::remove_dir_all(&image);
        t!(fs::create_dir_all(&image));

        // The first argument is a "temporary directory" which is just
        // thrown away (this contains the runtime DLLs included in the rustc package
        // above) and the second argument is where to place all the MinGW components
        // (which is what we want).
        make_win_dist(&tmpdir(builder), &image, host, &builder);

        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust-MinGW")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=Rust-MinGW-is-installed.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg(format!("--package-name={}-{}", name, host))
           .arg("--component-name=rust-mingw")
           .arg("--legacy-manifest-dirs=rustlib,cargo");
        builder.run(&mut cmd);
        t!(fs::remove_dir_all(&image));
        Some(distdir(builder).join(format!("{}-{}.tar.gz", name, host)))
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Rustc {
    pub compiler: Compiler,
}

impl Step for Rustc {
    type Output = PathBuf;
    const DEFAULT: bool = true;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("src/librustc")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Rustc {
            compiler: run.builder.compiler(run.builder.top_stage, run.target),
        });
    }

    /// Creates the `rustc` installer component.
    fn run(self, builder: &Builder) -> PathBuf {
        let compiler = self.compiler;
        let host = self.compiler.host;

        builder.info(&format!("Dist rustc stage{} ({})", compiler.stage, host));
        let name = pkgname(builder, "rustc");
        let image = tmpdir(builder).join(format!("{}-{}-image", name, host));
        let _ = fs::remove_dir_all(&image);
        let overlay = tmpdir(builder).join(format!("{}-{}-overlay", name, host));
        let _ = fs::remove_dir_all(&overlay);

        // Prepare the rustc "image", what will actually end up getting installed
        prepare_image(builder, compiler, &image);

        // Prepare the overlay which is part of the tarball but won't actually be
        // installed
        let cp = |file: &str| {
            builder.install(&builder.src.join(file), &overlay, 0o644);
        };
        cp("COPYRIGHT");
        cp("LICENSE-APACHE");
        cp("LICENSE-MIT");
        cp("README.md");
        // tiny morsel of metadata is used by rust-packaging
        let version = builder.rust_version();
        builder.create(&overlay.join("version"), &version);
        if let Some(sha) = builder.rust_sha() {
            builder.create(&overlay.join("git-commit-hash"), &sha);
        }

        // On MinGW we've got a few runtime DLL dependencies that we need to
        // include. The first argument to this script is where to put these DLLs
        // (the image we're creating), and the second argument is a junk directory
        // to ignore all other MinGW stuff the script creates.
        //
        // On 32-bit MinGW we're always including a DLL which needs some extra
        // licenses to distribute. On 64-bit MinGW we don't actually distribute
        // anything requiring us to distribute a license, but it's likely the
        // install will *also* include the rust-mingw package, which also needs
        // licenses, so to be safe we just include it here in all MinGW packages.
        if host.contains("pc-windows-gnu") {
            make_win_dist(&image, &tmpdir(builder), host, builder);

            let dst = image.join("share/doc");
            t!(fs::create_dir_all(&dst));
            builder.cp_r(&builder.src.join("src/etc/third-party"), &dst);
        }

        // Finally, wrap everything up in a nice tarball!
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=Rust-is-ready-to-roll.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg("--non-installed-overlay").arg(&overlay)
           .arg(format!("--package-name={}-{}", name, host))
           .arg("--component-name=rustc")
           .arg("--legacy-manifest-dirs=rustlib,cargo");
        builder.run(&mut cmd);
        builder.remove_dir(&image);
        builder.remove_dir(&overlay);

        return distdir(builder).join(format!("{}-{}.tar.gz", name, host));

        fn prepare_image(builder: &Builder, compiler: Compiler, image: &Path) {
            let host = compiler.host;
            let src = builder.sysroot(compiler);
            let libdir = libdir(&host);

            // Copy rustc/rustdoc binaries
            t!(fs::create_dir_all(image.join("bin")));
            builder.cp_r(&src.join("bin"), &image.join("bin"));

            builder.install(&builder.rustdoc(compiler.host), &image.join("bin"), 0o755);

            // Copy runtime DLLs needed by the compiler
            if libdir != "bin" {
                for entry in builder.read_dir(&src.join(libdir)) {
                    let name = entry.file_name();
                    if let Some(s) = name.to_str() {
                        if is_dylib(s) {
                            builder.install(&entry.path(), &image.join(libdir), 0o644);
                        }
                    }
                }
            }

            // Copy over the codegen backends
            let backends_src = builder.sysroot_codegen_backends(compiler);
            let backends_rel = backends_src.strip_prefix(&src).unwrap();
            let backends_dst = image.join(&backends_rel);
            t!(fs::create_dir_all(&backends_dst));
            builder.cp_r(&backends_src, &backends_dst);

            // Copy libLLVM.so to the lib dir as well, if needed. While not
            // technically needed by rustc itself it's needed by lots of other
            // components like the llvm tools and LLD. LLD is included below and
            // tools/LLDB come later, so let's just throw it in the rustc
            // component for now.
            maybe_install_llvm_dylib(builder, host, image);

            // Copy over lld if it's there
            if builder.config.lld_enabled {
                let exe = exe("rust-lld", &compiler.host);
                let src = builder.sysroot_libdir(compiler, host)
                    .parent()
                    .unwrap()
                    .join("bin")
                    .join(&exe);
                // for the rationale about this rename check `compile::copy_lld_to_sysroot`
                let dst = image.join("lib/rustlib")
                    .join(&*host)
                    .join("bin")
                    .join(&exe);
                t!(fs::create_dir_all(&dst.parent().unwrap()));
                builder.copy(&src, &dst);
            }

            // Man pages
            t!(fs::create_dir_all(image.join("share/man/man1")));
            let man_src = builder.src.join("src/doc/man");
            let man_dst = image.join("share/man/man1");
            let month_year = t!(time::strftime("%B %Y", &time::now()));
            // don't use our `bootstrap::util::{copy, cp_r}`, because those try
            // to hardlink, and we don't want to edit the source templates
            for file_entry in builder.read_dir(&man_src) {
                let page_src = file_entry.path();
                let page_dst = man_dst.join(file_entry.file_name());
                t!(fs::copy(&page_src, &page_dst));
                // template in month/year and version number
                builder.replace_in_file(&page_dst,
                                &[("<INSERT DATE HERE>", &month_year),
                                  ("<INSERT VERSION HERE>", channel::CFG_RELEASE_NUM)]);
            }

            // Debugger scripts
            builder.ensure(DebuggerScripts {
                sysroot: INTERNER.intern_path(image.to_owned()),
                host,
            });

            // Misc license info
            let cp = |file: &str| {
                builder.install(&builder.src.join(file), &image.join("share/doc/rust"), 0o644);
            };
            cp("COPYRIGHT");
            cp("LICENSE-APACHE");
            cp("LICENSE-MIT");
            cp("README.md");
        }
    }
}

#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub struct DebuggerScripts {
    pub sysroot: Interned<PathBuf>,
    pub host: Interned<String>,
}

impl Step for DebuggerScripts {
    type Output = ();

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("src/lldb_batchmode.py")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(DebuggerScripts {
            sysroot: run.builder.sysroot(run.builder.compiler(run.builder.top_stage, run.host)),
            host: run.target,
        });
    }

    /// Copies debugger scripts for `target` into the `sysroot` specified.
    fn run(self, builder: &Builder) {
        let host = self.host;
        let sysroot = self.sysroot;
        let dst = sysroot.join("lib/rustlib/etc");
        t!(fs::create_dir_all(&dst));
        let cp_debugger_script = |file: &str| {
            builder.install(&builder.src.join("src/etc/").join(file), &dst, 0o644);
        };
        if host.contains("windows-msvc") {
            // windbg debugger scripts
            builder.install(&builder.src.join("src/etc/rust-windbg.cmd"), &sysroot.join("bin"),
                0o755);

            cp_debugger_script("natvis/intrinsic.natvis");
            cp_debugger_script("natvis/liballoc.natvis");
            cp_debugger_script("natvis/libcore.natvis");
        } else {
            cp_debugger_script("debugger_pretty_printers_common.py");

            // gdb debugger scripts
            builder.install(&builder.src.join("src/etc/rust-gdb"), &sysroot.join("bin"),
                    0o755);

            cp_debugger_script("gdb_load_rust_pretty_printers.py");
            cp_debugger_script("gdb_rust_pretty_printing.py");

            // lldb debugger scripts
            builder.install(&builder.src.join("src/etc/rust-lldb"), &sysroot.join("bin"),
                    0o755);

            cp_debugger_script("lldb_rust_formatters.py");
        }
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Std {
    pub compiler: Compiler,
    pub target: Interned<String>,
}

impl Step for Std {
    type Output = PathBuf;
    const DEFAULT: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("src/libstd")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Std {
            compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
            target: run.target,
        });
    }

    fn run(self, builder: &Builder) -> PathBuf {
        let compiler = self.compiler;
        let target = self.target;

        let name = pkgname(builder, "rust-std");
        builder.info(&format!("Dist std stage{} ({} -> {})",
            compiler.stage, &compiler.host, target));

        // The only true set of target libraries came from the build triple, so
        // let's reduce redundant work by only producing archives from that host.
        if compiler.host != builder.config.build {
            builder.info("\tskipping, not a build host");
            return distdir(builder).join(format!("{}-{}.tar.gz", name, target));
        }

        // We want to package up as many target libraries as possible
        // for the `rust-std` package, so if this is a host target we
        // depend on librustc and otherwise we just depend on libtest.
        if builder.hosts.iter().any(|t| t == target) {
            builder.ensure(compile::Rustc { compiler, target });
        } else {
            if builder.no_std(target) == Some(true) {
                // the `test` doesn't compile for no-std targets
                builder.ensure(compile::Std { compiler, target });
            } else {
                builder.ensure(compile::Test { compiler, target });
            }
        }

        let image = tmpdir(builder).join(format!("{}-{}-image", name, target));
        let _ = fs::remove_dir_all(&image);

        let dst = image.join("lib/rustlib").join(target);
        t!(fs::create_dir_all(&dst));
        let mut src = builder.sysroot_libdir(compiler, target).to_path_buf();
        src.pop(); // Remove the trailing /lib folder from the sysroot_libdir
        builder.cp_filtered(&src, &dst, &|path| {
            let name = path.file_name().and_then(|s| s.to_str());
            name != Some(builder.config.rust_codegen_backends_dir.as_str()) &&
                name != Some("bin")

        });

        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=std-is-standing-at-the-ready.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg(format!("--package-name={}-{}", name, target))
           .arg(format!("--component-name=rust-std-{}", target))
           .arg("--legacy-manifest-dirs=rustlib,cargo");
        builder.run(&mut cmd);
        builder.remove_dir(&image);
        distdir(builder).join(format!("{}-{}.tar.gz", name, target))
    }
}

#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Analysis {
    pub compiler: Compiler,
    pub target: Interned<String>,
}

impl Step for Analysis {
    type Output = PathBuf;
    const DEFAULT: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        let builder = run.builder;
        run.path("analysis").default_condition(builder.config.extended)
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Analysis {
            compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
            target: run.target,
        });
    }

    /// Creates a tarball of save-analysis metadata, if available.
    fn run(self, builder: &Builder) -> PathBuf {
        let compiler = self.compiler;
        let target = self.target;
        assert!(builder.config.extended);
        builder.info("Dist analysis");
        let name = pkgname(builder, "rust-analysis");

        if &compiler.host != builder.config.build {
            builder.info("\tskipping, not a build host");
            return distdir(builder).join(format!("{}-{}.tar.gz", name, target));
        }

        builder.ensure(Std { compiler, target });

        // Package save-analysis from stage1 if not doing a full bootstrap, as the
        // stage2 artifacts is simply copied from stage1 in that case.
        let compiler = if builder.force_use_stage1(compiler, target) {
            builder.compiler(1, compiler.host)
        } else {
            compiler.clone()
        };

        let image = tmpdir(builder).join(format!("{}-{}-image", name, target));

        let src = builder.stage_out(compiler, Mode::Std)
            .join(target).join(builder.cargo_dir()).join("deps");

        let image_src = src.join("save-analysis");
        let dst = image.join("lib/rustlib").join(target).join("analysis");
        t!(fs::create_dir_all(&dst));
        builder.info(&format!("image_src: {:?}, dst: {:?}", image_src, dst));
        builder.cp_r(&image_src, &dst);

        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=save-analysis-saved.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg(format!("--package-name={}-{}", name, target))
           .arg(format!("--component-name=rust-analysis-{}", target))
           .arg("--legacy-manifest-dirs=rustlib,cargo");
        builder.run(&mut cmd);
        builder.remove_dir(&image);
        distdir(builder).join(format!("{}-{}.tar.gz", name, target))
    }
}

fn copy_src_dirs(builder: &Builder, src_dirs: &[&str], exclude_dirs: &[&str], dst_dir: &Path) {
    fn filter_fn(exclude_dirs: &[&str], dir: &str, path: &Path) -> bool {
        let spath = match path.to_str() {
            Some(path) => path,
            None => return false,
        };
        if spath.ends_with("~") || spath.ends_with(".pyc") {
            return false
        }
        if (spath.contains("llvm/test") || spath.contains("llvm\\test")) &&
            (spath.ends_with(".ll") ||
             spath.ends_with(".td") ||
             spath.ends_with(".s")) {
            return false
        }
        if spath.contains("test/emscripten") || spath.contains("test\\emscripten") {
            return false
        }

        let full_path = Path::new(dir).join(path);
        if exclude_dirs.iter().any(|excl| full_path == Path::new(excl)) {
            return false;
        }

        let excludes = [
            "CVS", "RCS", "SCCS", ".git", ".gitignore", ".gitmodules",
            ".gitattributes", ".cvsignore", ".svn", ".arch-ids", "{arch}",
            "=RELEASE-ID", "=meta-update", "=update", ".bzr", ".bzrignore",
            ".bzrtags", ".hg", ".hgignore", ".hgrags", "_darcs",
        ];
        !path.iter()
             .map(|s| s.to_str().unwrap())
             .any(|s| excludes.contains(&s))
    }

    // Copy the directories using our filter
    for item in src_dirs {
        let dst = &dst_dir.join(item);
        t!(fs::create_dir_all(dst));
        builder.cp_filtered(
            &builder.src.join(item), dst, &|path| filter_fn(exclude_dirs, item, path));
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Src;

impl Step for Src {
    /// The output path of the src installer tarball
    type Output = PathBuf;
    const DEFAULT: bool = true;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("src")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Src);
    }

    /// Creates the `rust-src` installer component
    fn run(self, builder: &Builder) -> PathBuf {
        builder.info("Dist src");

        let name = pkgname(builder, "rust-src");
        let image = tmpdir(builder).join(format!("{}-image", name));
        let _ = fs::remove_dir_all(&image);

        let dst = image.join("lib/rustlib/src");
        let dst_src = dst.join("rust");
        t!(fs::create_dir_all(&dst_src));

        let src_files = [
            "Cargo.lock",
        ];
        // This is the reduced set of paths which will become the rust-src component
        // (essentially libstd and all of its path dependencies)
        let std_src_dirs = [
            "src/build_helper",
            "src/dlmalloc",
            "src/liballoc",
            "src/libbacktrace",
            "src/libcompiler_builtins",
            "src/libcore",
            "src/liblibc",
            "src/libpanic_abort",
            "src/libpanic_unwind",
            "src/librustc_asan",
            "src/librustc_lsan",
            "src/librustc_msan",
            "src/librustc_tsan",
            "src/libstd",
            "src/libunwind",
            "src/rustc/compiler_builtins_shim",
            "src/rustc/libc_shim",
            "src/rustc/dlmalloc_shim",
            "src/libtest",
            "src/libterm",
            "src/libprofiler_builtins",
            "src/stdsimd",
            "src/libproc_macro",
        ];
        let std_src_dirs_exclude = [
            "src/libcompiler_builtins/compiler-rt/test",
        ];

        copy_src_dirs(builder, &std_src_dirs[..], &std_src_dirs_exclude[..], &dst_src);
        for file in src_files.iter() {
            builder.copy(&builder.src.join(file), &dst_src.join(file));
        }

        // Create source tarball in rust-installer format
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=Awesome-Source.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg(format!("--package-name={}", name))
           .arg("--component-name=rust-src")
           .arg("--legacy-manifest-dirs=rustlib,cargo");
        builder.run(&mut cmd);

        builder.remove_dir(&image);
        distdir(builder).join(&format!("{}.tar.gz", name))
    }
}

const CARGO_VENDOR_VERSION: &str = "0.1.19";

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct PlainSourceTarball;

impl Step for PlainSourceTarball {
    /// Produces the location of the tarball generated
    type Output = PathBuf;
    const DEFAULT: bool = true;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        let builder = run.builder;
        run.path("src").default_condition(builder.config.rust_dist_src)
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(PlainSourceTarball);
    }

    /// Creates the plain source tarball
    fn run(self, builder: &Builder) -> PathBuf {
        builder.info("Create plain source tarball");

        // Make sure that the root folder of tarball has the correct name
        let plain_name = format!("{}-src", pkgname(builder, "rustc"));
        let plain_dst_src = tmpdir(builder).join(&plain_name);
        let _ = fs::remove_dir_all(&plain_dst_src);
        t!(fs::create_dir_all(&plain_dst_src));

        // This is the set of root paths which will become part of the source package
        let src_files = [
            "COPYRIGHT",
            "LICENSE-APACHE",
            "LICENSE-MIT",
            "CONTRIBUTING.md",
            "README.md",
            "RELEASES.md",
            "configure",
            "x.py",
            "config.toml.example",
            "Cargo.toml",
            "Cargo.lock",
        ];
        let src_dirs = [
            "src",
        ];

        copy_src_dirs(builder, &src_dirs[..], &[], &plain_dst_src);

        // Copy the files normally
        for item in &src_files {
            builder.copy(&builder.src.join(item), &plain_dst_src.join(item));
        }

        // Create the version file
        builder.create(&plain_dst_src.join("version"), &builder.rust_version());
        if let Some(sha) = builder.rust_sha() {
            builder.create(&plain_dst_src.join("git-commit-hash"), &sha);
        }

        // If we're building from git sources, we need to vendor a complete distribution.
        if builder.rust_info.is_git() {
            // Get cargo-vendor installed, if it isn't already.
            let mut has_cargo_vendor = false;
            let mut cmd = Command::new(&builder.initial_cargo);
            for line in output(cmd.arg("install").arg("--list")).lines() {
                has_cargo_vendor |= line.starts_with("cargo-vendor ");
            }
            if !has_cargo_vendor {
                let mut cmd = builder.cargo(
                    builder.compiler(0, builder.config.build),
                    Mode::ToolBootstrap,
                    builder.config.build,
                    "install"
                );
                cmd.arg("--force")
                   .arg("--debug")
                   .arg("--vers").arg(CARGO_VENDOR_VERSION)
                   .arg("cargo-vendor");
                builder.run(&mut cmd);
            }

            // Vendor all Cargo dependencies
            let mut cmd = Command::new(&builder.initial_cargo);
            cmd.arg("vendor")
               .current_dir(&plain_dst_src);
            builder.run(&mut cmd);
        }

        // Create plain source tarball
        let plain_name = format!("rustc-{}-src", builder.rust_package_vers());
        let mut tarball = distdir(builder).join(&format!("{}.tar.gz", plain_name));
        tarball.set_extension(""); // strip .gz
        tarball.set_extension(""); // strip .tar
        if let Some(dir) = tarball.parent() {
            builder.create_dir(&dir);
        }
        builder.info("running installer");
        let mut cmd = rust_installer(builder);
        cmd.arg("tarball")
           .arg("--input").arg(&plain_name)
           .arg("--output").arg(&tarball)
           .arg("--work-dir=.")
           .current_dir(tmpdir(builder));
        builder.run(&mut cmd);
        distdir(builder).join(&format!("{}.tar.gz", plain_name))
    }
}

// We have to run a few shell scripts, which choke quite a bit on both `\`
// characters and on `C:\` paths, so normalize both of them away.
pub fn sanitize_sh(path: &Path) -> String {
    let path = path.to_str().unwrap().replace("\\", "/");
    return change_drive(&path).unwrap_or(path);

    fn change_drive(s: &str) -> Option<String> {
        let mut ch = s.chars();
        let drive = ch.next().unwrap_or('C');
        if ch.next() != Some(':') {
            return None
        }
        if ch.next() != Some('/') {
            return None
        }
        Some(format!("/{}/{}", drive, &s[drive.len_utf8() + 2..]))
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Cargo {
    pub stage: u32,
    pub target: Interned<String>,
}

impl Step for Cargo {
    type Output = PathBuf;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("cargo")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Cargo {
            stage: run.builder.top_stage,
            target: run.target,
        });
    }

    fn run(self, builder: &Builder) -> PathBuf {
        let stage = self.stage;
        let target = self.target;

        builder.info(&format!("Dist cargo stage{} ({})", stage, target));
        let src = builder.src.join("src/tools/cargo");
        let etc = src.join("src/etc");
        let release_num = builder.release_num("cargo");
        let name = pkgname(builder, "cargo");
        let version = builder.cargo_info.version(builder, &release_num);

        let tmp = tmpdir(builder);
        let image = tmp.join("cargo-image");
        drop(fs::remove_dir_all(&image));
        builder.create_dir(&image);

        // Prepare the image directory
        builder.create_dir(&image.join("share/zsh/site-functions"));
        builder.create_dir(&image.join("etc/bash_completion.d"));
        let cargo = builder.ensure(tool::Cargo {
            compiler: builder.compiler(stage, builder.config.build),
            target
        });
        builder.install(&cargo, &image.join("bin"), 0o755);
        for man in t!(etc.join("man").read_dir()) {
            let man = t!(man);
            builder.install(&man.path(), &image.join("share/man/man1"), 0o644);
        }
        builder.install(&etc.join("_cargo"), &image.join("share/zsh/site-functions"), 0o644);
        builder.copy(&etc.join("cargo.bashcomp.sh"),
             &image.join("etc/bash_completion.d/cargo"));
        let doc = image.join("share/doc/cargo");
        builder.install(&src.join("README.md"), &doc, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &doc, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &doc, 0o644);
        builder.install(&src.join("LICENSE-THIRD-PARTY"), &doc, 0o644);

        // Prepare the overlay
        let overlay = tmp.join("cargo-overlay");
        drop(fs::remove_dir_all(&overlay));
        builder.create_dir(&overlay);
        builder.install(&src.join("README.md"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-THIRD-PARTY"), &overlay, 0o644);
        builder.create(&overlay.join("version"), &version);

        // Generate the installer tarball
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=Rust-is-ready-to-roll.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg("--non-installed-overlay").arg(&overlay)
           .arg(format!("--package-name={}-{}", name, target))
           .arg("--component-name=cargo")
           .arg("--legacy-manifest-dirs=rustlib,cargo");
        builder.run(&mut cmd);
        distdir(builder).join(format!("{}-{}.tar.gz", name, target))
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Rls {
    pub stage: u32,
    pub target: Interned<String>,
}

impl Step for Rls {
    type Output = Option<PathBuf>;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("rls")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Rls {
            stage: run.builder.top_stage,
            target: run.target,
        });
    }

    fn run(self, builder: &Builder) -> Option<PathBuf> {
        let stage = self.stage;
        let target = self.target;
        assert!(builder.config.extended);

        builder.info(&format!("Dist RLS stage{} ({})", stage, target));
        let src = builder.src.join("src/tools/rls");
        let release_num = builder.release_num("rls");
        let name = pkgname(builder, "rls");
        let version = builder.rls_info.version(builder, &release_num);

        let tmp = tmpdir(builder);
        let image = tmp.join("rls-image");
        drop(fs::remove_dir_all(&image));
        t!(fs::create_dir_all(&image));

        // Prepare the image directory
        // We expect RLS to build, because we've exited this step above if tool
        // state for RLS isn't testing.
        let rls = builder.ensure(tool::Rls {
            compiler: builder.compiler(stage, builder.config.build),
            target, extra_features: Vec::new()
        }).or_else(|| { missing_tool("RLS", builder.build.config.missing_tools); None })?;

        builder.install(&rls, &image.join("bin"), 0o755);
        let doc = image.join("share/doc/rls");
        builder.install(&src.join("README.md"), &doc, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &doc, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &doc, 0o644);

        // Prepare the overlay
        let overlay = tmp.join("rls-overlay");
        drop(fs::remove_dir_all(&overlay));
        t!(fs::create_dir_all(&overlay));
        builder.install(&src.join("README.md"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &overlay, 0o644);
        builder.create(&overlay.join("version"), &version);

        // Generate the installer tarball
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=RLS-ready-to-serve.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg("--non-installed-overlay").arg(&overlay)
           .arg(format!("--package-name={}-{}", name, target))
           .arg("--legacy-manifest-dirs=rustlib,cargo")
           .arg("--component-name=rls-preview");

        builder.run(&mut cmd);
        Some(distdir(builder).join(format!("{}-{}.tar.gz", name, target)))
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Clippy {
    pub stage: u32,
    pub target: Interned<String>,
}

impl Step for Clippy {
    type Output = Option<PathBuf>;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("clippy")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Clippy {
            stage: run.builder.top_stage,
            target: run.target,
        });
    }

    fn run(self, builder: &Builder) -> Option<PathBuf> {
        let stage = self.stage;
        let target = self.target;
        assert!(builder.config.extended);

        builder.info(&format!("Dist clippy stage{} ({})", stage, target));
        let src = builder.src.join("src/tools/clippy");
        let release_num = builder.release_num("clippy");
        let name = pkgname(builder, "clippy");
        let version = builder.clippy_info.version(builder, &release_num);

        let tmp = tmpdir(builder);
        let image = tmp.join("clippy-image");
        drop(fs::remove_dir_all(&image));
        builder.create_dir(&image);

        // Prepare the image directory
        // We expect clippy to build, because we've exited this step above if tool
        // state for clippy isn't testing.
        let clippy = builder.ensure(tool::Clippy {
            compiler: builder.compiler(stage, builder.config.build),
            target, extra_features: Vec::new()
        }).or_else(|| { missing_tool("clippy", builder.build.config.missing_tools); None })?;
        let cargoclippy = builder.ensure(tool::CargoClippy {
            compiler: builder.compiler(stage, builder.config.build),
            target, extra_features: Vec::new()
        }).or_else(|| { missing_tool("cargo clippy", builder.build.config.missing_tools); None })?;

        builder.install(&clippy, &image.join("bin"), 0o755);
        builder.install(&cargoclippy, &image.join("bin"), 0o755);
        let doc = image.join("share/doc/clippy");
        builder.install(&src.join("README.md"), &doc, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &doc, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &doc, 0o644);

        // Prepare the overlay
        let overlay = tmp.join("clippy-overlay");
        drop(fs::remove_dir_all(&overlay));
        t!(fs::create_dir_all(&overlay));
        builder.install(&src.join("README.md"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &doc, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &doc, 0o644);
        builder.create(&overlay.join("version"), &version);

        // Generate the installer tarball
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=clippy-ready-to-serve.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg("--non-installed-overlay").arg(&overlay)
           .arg(format!("--package-name={}-{}", name, target))
           .arg("--legacy-manifest-dirs=rustlib,cargo")
           .arg("--component-name=clippy-preview");

        builder.run(&mut cmd);
        Some(distdir(builder).join(format!("{}-{}.tar.gz", name, target)))
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Rustfmt {
    pub stage: u32,
    pub target: Interned<String>,
}

impl Step for Rustfmt {
    type Output = Option<PathBuf>;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("rustfmt")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Rustfmt {
            stage: run.builder.top_stage,
            target: run.target,
        });
    }

    fn run(self, builder: &Builder) -> Option<PathBuf> {
        let stage = self.stage;
        let target = self.target;

        builder.info(&format!("Dist Rustfmt stage{} ({})", stage, target));
        let src = builder.src.join("src/tools/rustfmt");
        let release_num = builder.release_num("rustfmt");
        let name = pkgname(builder, "rustfmt");
        let version = builder.rustfmt_info.version(builder, &release_num);

        let tmp = tmpdir(builder);
        let image = tmp.join("rustfmt-image");
        drop(fs::remove_dir_all(&image));
        builder.create_dir(&image);

        // Prepare the image directory
        let rustfmt = builder.ensure(tool::Rustfmt {
            compiler: builder.compiler(stage, builder.config.build),
            target, extra_features: Vec::new()
        }).or_else(|| { missing_tool("Rustfmt", builder.build.config.missing_tools); None })?;
        let cargofmt = builder.ensure(tool::Cargofmt {
            compiler: builder.compiler(stage, builder.config.build),
            target, extra_features: Vec::new()
        }).or_else(|| { missing_tool("Cargofmt", builder.build.config.missing_tools); None })?;

        builder.install(&rustfmt, &image.join("bin"), 0o755);
        builder.install(&cargofmt, &image.join("bin"), 0o755);
        let doc = image.join("share/doc/rustfmt");
        builder.install(&src.join("README.md"), &doc, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &doc, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &doc, 0o644);

        // Prepare the overlay
        let overlay = tmp.join("rustfmt-overlay");
        drop(fs::remove_dir_all(&overlay));
        builder.create_dir(&overlay);
        builder.install(&src.join("README.md"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-MIT"), &overlay, 0o644);
        builder.install(&src.join("LICENSE-APACHE"), &overlay, 0o644);
        builder.create(&overlay.join("version"), &version);

        // Generate the installer tarball
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
           .arg("--product-name=Rust")
           .arg("--rel-manifest-dir=rustlib")
           .arg("--success-message=rustfmt-ready-to-fmt.")
           .arg("--image-dir").arg(&image)
           .arg("--work-dir").arg(&tmpdir(builder))
           .arg("--output-dir").arg(&distdir(builder))
           .arg("--non-installed-overlay").arg(&overlay)
           .arg(format!("--package-name={}-{}", name, target))
           .arg("--legacy-manifest-dirs=rustlib,cargo")
           .arg("--component-name=rustfmt-preview");

        builder.run(&mut cmd);
        Some(distdir(builder).join(format!("{}-{}.tar.gz", name, target)))
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct Extended {
    stage: u32,
    host: Interned<String>,
    target: Interned<String>,
}

impl Step for Extended {
    type Output = ();
    const DEFAULT: bool = true;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        let builder = run.builder;
        run.path("extended").default_condition(builder.config.extended)
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Extended {
            stage: run.builder.top_stage,
            host: run.builder.config.build,
            target: run.target,
        });
    }

    /// Creates a combined installer for the specified target in the provided stage.
    fn run(self, builder: &Builder) {
        let stage = self.stage;
        let target = self.target;

        builder.info(&format!("Dist extended stage{} ({})", stage, target));

        let rustc_installer = builder.ensure(Rustc {
            compiler: builder.compiler(stage, target),
        });
        let cargo_installer = builder.ensure(Cargo { stage, target });
        let rustfmt_installer = builder.ensure(Rustfmt { stage, target });
        let rls_installer = builder.ensure(Rls { stage, target });
        let llvm_tools_installer = builder.ensure(LlvmTools { stage, target });
        let clippy_installer = builder.ensure(Clippy { stage, target });
        let lldb_installer = builder.ensure(Lldb { target });
        let mingw_installer = builder.ensure(Mingw { host: target });
        let analysis_installer = builder.ensure(Analysis {
            compiler: builder.compiler(stage, self.host),
            target
        });

        let docs_installer = builder.ensure(Docs { stage, host: target, });
        let std_installer = builder.ensure(Std {
            compiler: builder.compiler(stage, self.host),
            target,
        });

        let tmp = tmpdir(builder);
        let overlay = tmp.join("extended-overlay");
        let etc = builder.src.join("src/etc/installer");
        let work = tmp.join("work");

        let _ = fs::remove_dir_all(&overlay);
        builder.install(&builder.src.join("COPYRIGHT"), &overlay, 0o644);
        builder.install(&builder.src.join("LICENSE-APACHE"), &overlay, 0o644);
        builder.install(&builder.src.join("LICENSE-MIT"), &overlay, 0o644);
        let version = builder.rust_version();
        builder.create(&overlay.join("version"), &version);
        if let Some(sha) = builder.rust_sha() {
            builder.create(&overlay.join("git-commit-hash"), &sha);
        }
        builder.install(&etc.join("README.md"), &overlay, 0o644);

        // When rust-std package split from rustc, we needed to ensure that during
        // upgrades rustc was upgraded before rust-std. To avoid rustc clobbering
        // the std files during uninstall. To do this ensure that rustc comes
        // before rust-std in the list below.
        let mut tarballs = Vec::new();
        tarballs.push(rustc_installer);
        tarballs.push(cargo_installer);
        tarballs.extend(rls_installer.clone());
        tarballs.extend(clippy_installer.clone());
        tarballs.extend(rustfmt_installer.clone());
        tarballs.extend(llvm_tools_installer);
        tarballs.extend(lldb_installer);
        tarballs.push(analysis_installer);
        tarballs.push(std_installer);
        if builder.config.docs {
            tarballs.push(docs_installer);
        }
        if target.contains("pc-windows-gnu") {
            tarballs.push(mingw_installer.unwrap());
        }
        let mut input_tarballs = tarballs[0].as_os_str().to_owned();
        for tarball in &tarballs[1..] {
            input_tarballs.push(",");
            input_tarballs.push(tarball);
        }

        let mut cmd = rust_installer(builder);
        cmd.arg("combine")
            .arg("--product-name=Rust")
            .arg("--rel-manifest-dir=rustlib")
            .arg("--success-message=Rust-is-ready-to-roll.")
            .arg("--work-dir").arg(&work)
            .arg("--output-dir").arg(&distdir(builder))
            .arg(format!("--package-name={}-{}", pkgname(builder, "rust"), target))
            .arg("--legacy-manifest-dirs=rustlib,cargo")
            .arg("--input-tarballs").arg(input_tarballs)
            .arg("--non-installed-overlay").arg(&overlay);
        builder.run(&mut cmd);

        let mut license = String::new();
        license += &builder.read(&builder.src.join("COPYRIGHT"));
        license += &builder.read(&builder.src.join("LICENSE-APACHE"));
        license += &builder.read(&builder.src.join("LICENSE-MIT"));
        license.push_str("\n");
        license.push_str("\n");

        let rtf = r"{\rtf1\ansi\deff0{\fonttbl{\f0\fnil\fcharset0 Arial;}}\nowwrap\fs18";
        let mut rtf = rtf.to_string();
        rtf.push_str("\n");
        for line in license.lines() {
            rtf.push_str(line);
            rtf.push_str("\\line ");
        }
        rtf.push_str("}");

        fn filter(contents: &str, marker: &str) -> String {
            let start = format!("tool-{}-start", marker);
            let end = format!("tool-{}-end", marker);
            let mut lines = Vec::new();
            let mut omitted = false;
            for line in contents.lines() {
                if line.contains(&start) {
                    omitted = true;
                } else if line.contains(&end) {
                    omitted = false;
                } else if !omitted {
                    lines.push(line);
                }
            }

            lines.join("\n")
        }

        let xform = |p: &Path| {
            let mut contents = String::new();
            t!(t!(File::open(p)).read_to_string(&mut contents));
            if rls_installer.is_none() {
                contents = filter(&contents, "rls");
            }
            if clippy_installer.is_none() {
                contents = filter(&contents, "clippy");
            }
            if rustfmt_installer.is_none() {
                contents = filter(&contents, "rustfmt");
            }
            let ret = tmp.join(p.file_name().unwrap());
            t!(t!(File::create(&ret)).write_all(contents.as_bytes()));
            return ret
        };

        if target.contains("apple-darwin") {
            let pkg = tmp.join("pkg");
            let _ = fs::remove_dir_all(&pkg);

            let pkgbuild = |component: &str| {
                let mut cmd = Command::new("pkgbuild");
                cmd.arg("--identifier").arg(format!("org.rust-lang.{}", component))
                    .arg("--scripts").arg(pkg.join(component))
                    .arg("--nopayload")
                    .arg(pkg.join(component).with_extension("pkg"));
                builder.run(&mut cmd);
            };

            let prepare = |name: &str| {
                builder.create_dir(&pkg.join(name));
                builder.cp_r(&work.join(&format!("{}-{}", pkgname(builder, name), target)),
                        &pkg.join(name));
                builder.install(&etc.join("pkg/postinstall"), &pkg.join(name), 0o755);
                pkgbuild(name);
            };
            prepare("rustc");
            prepare("cargo");
            prepare("rust-docs");
            prepare("rust-std");
            prepare("rust-analysis");

            if rls_installer.is_some() {
                prepare("rls");
            }
            if clippy_installer.is_some() {
                prepare("clippy");
            }

            // create an 'uninstall' package
            builder.install(&etc.join("pkg/postinstall"), &pkg.join("uninstall"), 0o755);
            pkgbuild("uninstall");

            builder.create_dir(&pkg.join("res"));
            builder.create(&pkg.join("res/LICENSE.txt"), &license);
            builder.install(&etc.join("gfx/rust-logo.png"), &pkg.join("res"), 0o644);
            let mut cmd = Command::new("productbuild");
            cmd.arg("--distribution").arg(xform(&etc.join("pkg/Distribution.xml")))
                .arg("--resources").arg(pkg.join("res"))
                .arg(distdir(builder).join(format!("{}-{}.pkg",
                                                    pkgname(builder, "rust"),
                                                    target)))
                .arg("--package-path").arg(&pkg);
            builder.run(&mut cmd);
        }

        if target.contains("windows") {
            let exe = tmp.join("exe");
            let _ = fs::remove_dir_all(&exe);

            let prepare = |name: &str| {
                builder.create_dir(&exe.join(name));
                let dir = if name == "rust-std" || name == "rust-analysis" {
                    format!("{}-{}", name, target)
                } else if name == "rls" {
                    "rls-preview".to_string()
                } else if name == "clippy" {
                    "clippy-preview".to_string()
                } else {
                    name.to_string()
                };
                builder.cp_r(&work.join(&format!("{}-{}", pkgname(builder, name), target))
                            .join(dir),
                        &exe.join(name));
                builder.remove(&exe.join(name).join("manifest.in"));
            };
            prepare("rustc");
            prepare("cargo");
            prepare("rust-analysis");
            prepare("rust-docs");
            prepare("rust-std");
            if rls_installer.is_some() {
                prepare("rls");
            }
            if clippy_installer.is_some() {
                prepare("clippy");
            }
            if target.contains("windows-gnu") {
                prepare("rust-mingw");
            }

            builder.install(&xform(&etc.join("exe/rust.iss")), &exe, 0o644);
            builder.install(&etc.join("exe/modpath.iss"), &exe, 0o644);
            builder.install(&etc.join("exe/upgrade.iss"), &exe, 0o644);
            builder.install(&etc.join("gfx/rust-logo.ico"), &exe, 0o644);
            builder.create(&exe.join("LICENSE.txt"), &license);

            // Generate exe installer
            let mut cmd = Command::new("iscc");
            cmd.arg("rust.iss")
                .current_dir(&exe);
            if target.contains("windows-gnu") {
                cmd.arg("/dMINGW");
            }
            add_env(builder, &mut cmd, target);
            builder.run(&mut cmd);
            builder.install(&exe.join(format!("{}-{}.exe", pkgname(builder, "rust"), target)),
                    &distdir(builder),
                    0o755);

            // Generate msi installer
            let wix = PathBuf::from(env::var_os("WIX").unwrap());
            let heat = wix.join("bin/heat.exe");
            let candle = wix.join("bin/candle.exe");
            let light = wix.join("bin/light.exe");

            let heat_flags = ["-nologo", "-gg", "-sfrag", "-srd", "-sreg"];
            builder.run(Command::new(&heat)
                            .current_dir(&exe)
                            .arg("dir")
                            .arg("rustc")
                            .args(&heat_flags)
                            .arg("-cg").arg("RustcGroup")
                            .arg("-dr").arg("Rustc")
                            .arg("-var").arg("var.RustcDir")
                            .arg("-out").arg(exe.join("RustcGroup.wxs")));
            builder.run(Command::new(&heat)
                            .current_dir(&exe)
                            .arg("dir")
                            .arg("rust-docs")
                            .args(&heat_flags)
                            .arg("-cg").arg("DocsGroup")
                            .arg("-dr").arg("Docs")
                            .arg("-var").arg("var.DocsDir")
                            .arg("-out").arg(exe.join("DocsGroup.wxs"))
                            .arg("-t").arg(etc.join("msi/squash-components.xsl")));
            builder.run(Command::new(&heat)
                            .current_dir(&exe)
                            .arg("dir")
                            .arg("cargo")
                            .args(&heat_flags)
                            .arg("-cg").arg("CargoGroup")
                            .arg("-dr").arg("Cargo")
                            .arg("-var").arg("var.CargoDir")
                            .arg("-out").arg(exe.join("CargoGroup.wxs"))
                            .arg("-t").arg(etc.join("msi/remove-duplicates.xsl")));
            builder.run(Command::new(&heat)
                            .current_dir(&exe)
                            .arg("dir")
                            .arg("rust-std")
                            .args(&heat_flags)
                            .arg("-cg").arg("StdGroup")
                            .arg("-dr").arg("Std")
                            .arg("-var").arg("var.StdDir")
                            .arg("-out").arg(exe.join("StdGroup.wxs")));
            if rls_installer.is_some() {
                builder.run(Command::new(&heat)
                                .current_dir(&exe)
                                .arg("dir")
                                .arg("rls")
                                .args(&heat_flags)
                                .arg("-cg").arg("RlsGroup")
                                .arg("-dr").arg("Rls")
                                .arg("-var").arg("var.RlsDir")
                                .arg("-out").arg(exe.join("RlsGroup.wxs"))
                                .arg("-t").arg(etc.join("msi/remove-duplicates.xsl")));
            }
            if clippy_installer.is_some() {
                builder.run(Command::new(&heat)
                                .current_dir(&exe)
                                .arg("dir")
                                .arg("clippy")
                                .args(&heat_flags)
                                .arg("-cg").arg("ClippyGroup")
                                .arg("-dr").arg("Clippy")
                                .arg("-var").arg("var.ClippyDir")
                                .arg("-out").arg(exe.join("ClippyGroup.wxs"))
                                .arg("-t").arg(etc.join("msi/remove-duplicates.xsl")));
            }
            builder.run(Command::new(&heat)
                            .current_dir(&exe)
                            .arg("dir")
                            .arg("rust-analysis")
                            .args(&heat_flags)
                            .arg("-cg").arg("AnalysisGroup")
                            .arg("-dr").arg("Analysis")
                            .arg("-var").arg("var.AnalysisDir")
                            .arg("-out").arg(exe.join("AnalysisGroup.wxs"))
                            .arg("-t").arg(etc.join("msi/remove-duplicates.xsl")));
            if target.contains("windows-gnu") {
                builder.run(Command::new(&heat)
                                .current_dir(&exe)
                                .arg("dir")
                                .arg("rust-mingw")
                                .args(&heat_flags)
                                .arg("-cg").arg("GccGroup")
                                .arg("-dr").arg("Gcc")
                                .arg("-var").arg("var.GccDir")
                                .arg("-out").arg(exe.join("GccGroup.wxs")));
            }

            let candle = |input: &Path| {
                let output = exe.join(input.file_stem().unwrap())
                                .with_extension("wixobj");
                let arch = if target.contains("x86_64") {"x64"} else {"x86"};
                let mut cmd = Command::new(&candle);
                cmd.current_dir(&exe)
                    .arg("-nologo")
                    .arg("-dRustcDir=rustc")
                    .arg("-dDocsDir=rust-docs")
                    .arg("-dCargoDir=cargo")
                    .arg("-dStdDir=rust-std")
                    .arg("-dAnalysisDir=rust-analysis")
                    .arg("-arch").arg(&arch)
                    .arg("-out").arg(&output)
                    .arg(&input);
                add_env(builder, &mut cmd, target);

                if rls_installer.is_some() {
                    cmd.arg("-dRlsDir=rls");
                }
                if clippy_installer.is_some() {
                    cmd.arg("-dClippyDir=clippy");
                }
                if target.contains("windows-gnu") {
                    cmd.arg("-dGccDir=rust-mingw");
                }
                builder.run(&mut cmd);
            };
            candle(&xform(&etc.join("msi/rust.wxs")));
            candle(&etc.join("msi/ui.wxs"));
            candle(&etc.join("msi/rustwelcomedlg.wxs"));
            candle("RustcGroup.wxs".as_ref());
            candle("DocsGroup.wxs".as_ref());
            candle("CargoGroup.wxs".as_ref());
            candle("StdGroup.wxs".as_ref());
            if rls_installer.is_some() {
                candle("RlsGroup.wxs".as_ref());
            }
            if clippy_installer.is_some() {
                candle("ClippyGroup.wxs".as_ref());
            }
            candle("AnalysisGroup.wxs".as_ref());

            if target.contains("windows-gnu") {
                candle("GccGroup.wxs".as_ref());
            }

            builder.create(&exe.join("LICENSE.rtf"), &rtf);
            builder.install(&etc.join("gfx/banner.bmp"), &exe, 0o644);
            builder.install(&etc.join("gfx/dialogbg.bmp"), &exe, 0o644);

            let filename = format!("{}-{}.msi", pkgname(builder, "rust"), target);
            let mut cmd = Command::new(&light);
            cmd.arg("-nologo")
                .arg("-ext").arg("WixUIExtension")
                .arg("-ext").arg("WixUtilExtension")
                .arg("-out").arg(exe.join(&filename))
                .arg("rust.wixobj")
                .arg("ui.wixobj")
                .arg("rustwelcomedlg.wixobj")
                .arg("RustcGroup.wixobj")
                .arg("DocsGroup.wixobj")
                .arg("CargoGroup.wixobj")
                .arg("StdGroup.wixobj")
                .arg("AnalysisGroup.wixobj")
                .current_dir(&exe);

            if rls_installer.is_some() {
                cmd.arg("RlsGroup.wixobj");
            }
            if clippy_installer.is_some() {
                cmd.arg("ClippyGroup.wixobj");
            }

            if target.contains("windows-gnu") {
                cmd.arg("GccGroup.wixobj");
            }
            // ICE57 wrongly complains about the shortcuts
            cmd.arg("-sice:ICE57");

            builder.run(&mut cmd);

            if !builder.config.dry_run {
                t!(fs::rename(exe.join(&filename), distdir(builder).join(&filename)));
            }
        }
    }
}

fn add_env(builder: &Builder, cmd: &mut Command, target: Interned<String>) {
    let mut parts = channel::CFG_RELEASE_NUM.split('.');
    cmd.env("CFG_RELEASE_INFO", builder.rust_version())
       .env("CFG_RELEASE_NUM", channel::CFG_RELEASE_NUM)
       .env("CFG_RELEASE", builder.rust_release())
       .env("CFG_VER_MAJOR", parts.next().unwrap())
       .env("CFG_VER_MINOR", parts.next().unwrap())
       .env("CFG_VER_PATCH", parts.next().unwrap())
       .env("CFG_VER_BUILD", "0") // just needed to build
       .env("CFG_PACKAGE_VERS", builder.rust_package_vers())
       .env("CFG_PACKAGE_NAME", pkgname(builder, "rust"))
       .env("CFG_BUILD", target)
       .env("CFG_CHANNEL", &builder.config.channel);

    if target.contains("windows-gnu") {
       cmd.env("CFG_MINGW", "1")
          .env("CFG_ABI", "GNU");
    } else {
       cmd.env("CFG_MINGW", "0")
          .env("CFG_ABI", "MSVC");
    }

    if target.contains("x86_64") {
       cmd.env("CFG_PLATFORM", "x64");
    } else {
       cmd.env("CFG_PLATFORM", "x86");
    }
}

#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
pub struct HashSign;

impl Step for HashSign {
    type Output = ();
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("hash-and-sign")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(HashSign);
    }

    fn run(self, builder: &Builder) {
        let mut cmd = builder.tool_cmd(Tool::BuildManifest);
        if builder.config.dry_run {
            return;
        }
        let sign = builder.config.dist_sign_folder.as_ref().unwrap_or_else(|| {
            panic!("\n\nfailed to specify `dist.sign-folder` in `config.toml`\n\n")
        });
        let addr = builder.config.dist_upload_addr.as_ref().unwrap_or_else(|| {
            panic!("\n\nfailed to specify `dist.upload-addr` in `config.toml`\n\n")
        });
        let file = builder.config.dist_gpg_password_file.as_ref().unwrap_or_else(|| {
            panic!("\n\nfailed to specify `dist.gpg-password-file` in `config.toml`\n\n")
        });
        let mut pass = String::new();
        t!(t!(File::open(&file)).read_to_string(&mut pass));

        let today = output(Command::new("date").arg("+%Y-%m-%d"));

        cmd.arg(sign);
        cmd.arg(distdir(builder));
        cmd.arg(today.trim());
        cmd.arg(builder.rust_package_vers());
        cmd.arg(builder.package_vers(&builder.release_num("cargo")));
        cmd.arg(builder.package_vers(&builder.release_num("rls")));
        cmd.arg(builder.package_vers(&builder.release_num("clippy")));
        cmd.arg(builder.package_vers(&builder.release_num("rustfmt")));
        cmd.arg(builder.llvm_tools_package_vers());
        cmd.arg(builder.lldb_package_vers());
        cmd.arg(addr);

        builder.create_dir(&distdir(builder));

        let mut child = t!(cmd.stdin(Stdio::piped()).spawn());
        t!(child.stdin.take().unwrap().write_all(pass.as_bytes()));
        let status = t!(child.wait());
        assert!(status.success());
    }
}

// Maybe add libLLVM.so to the lib-dir. It will only have been built if
// LLVM tools are linked dynamically.
// Note: This function does no yet support Windows but we also don't support
//       linking LLVM tools dynamically on Windows yet.
fn maybe_install_llvm_dylib(builder: &Builder,
                            target: Interned<String>,
                            image: &Path) {
    let src_libdir = builder
        .llvm_out(target)
        .join("lib");
    let dst_libdir = image.join("lib/rustlib").join(&*target).join("lib");
    t!(fs::create_dir_all(&dst_libdir));

    if target.contains("apple-darwin") {
        let llvm_dylib_path = src_libdir.join("libLLVM.dylib");
        if llvm_dylib_path.exists() {
            builder.install(&llvm_dylib_path, &dst_libdir, 0o644);
        }
        return
    }

    // Usually libLLVM.so is a symlink to something like libLLVM-6.0.so.
    // Since tools link to the latter rather than the former, we have to
    // follow the symlink to find out what to distribute.
    let llvm_dylib_path = src_libdir.join("libLLVM.so");
    if llvm_dylib_path.exists() {
        let llvm_dylib_path = llvm_dylib_path.canonicalize().unwrap_or_else(|e| {
            panic!("dist: Error calling canonicalize path `{}`: {}",
                   llvm_dylib_path.display(), e);
        });


        builder.install(&llvm_dylib_path, &dst_libdir, 0o644);
    }
}

#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct LlvmTools {
    pub stage: u32,
    pub target: Interned<String>,
}

impl Step for LlvmTools {
    type Output = Option<PathBuf>;
    const ONLY_HOSTS: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("llvm-tools")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(LlvmTools {
            stage: run.builder.top_stage,
            target: run.target,
        });
    }

    fn run(self, builder: &Builder) -> Option<PathBuf> {
        let stage = self.stage;
        let target = self.target;
        assert!(builder.config.extended);

        /* run only if llvm-config isn't used */
        if let Some(config) = builder.config.target_config.get(&target) {
            if let Some(ref _s) = config.llvm_config {
                builder.info(&format!("Skipping LlvmTools stage{} ({}): external LLVM",
                    stage, target));
                return None;
            }
        }

        builder.info(&format!("Dist LlvmTools stage{} ({})", stage, target));
        let src = builder.src.join("src/llvm");
        let name = pkgname(builder, "llvm-tools");

        let tmp = tmpdir(builder);
        let image = tmp.join("llvm-tools-image");
        drop(fs::remove_dir_all(&image));

        // Prepare the image directory
        let src_bindir = builder
            .llvm_out(target)
            .join("bin");
        let dst_bindir = image.join("lib/rustlib")
            .join(&*target)
            .join("bin");
        t!(fs::create_dir_all(&dst_bindir));
        for tool in LLVM_TOOLS {
            let exe = src_bindir.join(exe(tool, &target));
            builder.install(&exe, &dst_bindir, 0o755);
        }

        // Prepare the overlay
        let overlay = tmp.join("llvm-tools-overlay");
        drop(fs::remove_dir_all(&overlay));
        builder.create_dir(&overlay);
        builder.install(&src.join("README.txt"), &overlay, 0o644);
        builder.install(&src.join("LICENSE.TXT"), &overlay, 0o644);
        builder.create(&overlay.join("version"), &builder.llvm_tools_vers());

        // Generate the installer tarball
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
            .arg("--product-name=Rust")
            .arg("--rel-manifest-dir=rustlib")
            .arg("--success-message=llvm-tools-installed.")
            .arg("--image-dir").arg(&image)
            .arg("--work-dir").arg(&tmpdir(builder))
            .arg("--output-dir").arg(&distdir(builder))
            .arg("--non-installed-overlay").arg(&overlay)
            .arg(format!("--package-name={}-{}", name, target))
            .arg("--legacy-manifest-dirs=rustlib,cargo")
            .arg("--component-name=llvm-tools-preview");


        builder.run(&mut cmd);
        Some(distdir(builder).join(format!("{}-{}.tar.gz", name, target)))
    }
}

#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct Lldb {
    pub target: Interned<String>,
}

impl Step for Lldb {
    type Output = Option<PathBuf>;
    const ONLY_HOSTS: bool = true;
    const DEFAULT: bool = true;

    fn should_run(run: ShouldRun) -> ShouldRun {
        run.path("src/tools/lldb")
    }

    fn make_run(run: RunConfig) {
        run.builder.ensure(Lldb {
            target: run.target,
        });
    }

    fn run(self, builder: &Builder) -> Option<PathBuf> {
        let target = self.target;

        if builder.config.dry_run {
            return None;
        }

        let bindir = builder
            .llvm_out(target)
            .join("bin");
        let lldb_exe = bindir.join(exe("lldb", &target));
        if !lldb_exe.exists() {
            return None;
        }

        builder.info(&format!("Dist Lldb ({})", target));
        let src = builder.src.join("src/tools/lldb");
        let name = pkgname(builder, "lldb");

        let tmp = tmpdir(builder);
        let image = tmp.join("lldb-image");
        drop(fs::remove_dir_all(&image));

        // Prepare the image directory
        let root = image.join("lib/rustlib").join(&*target);
        let dst = root.join("bin");
        t!(fs::create_dir_all(&dst));
        for program in &["lldb", "lldb-argdumper", "lldb-mi", "lldb-server"] {
            let exe = bindir.join(exe(program, &target));
            builder.install(&exe, &dst, 0o755);
        }

        // The libraries.
        let libdir = builder.llvm_out(target).join("lib");
        let dst = root.join("lib");
        t!(fs::create_dir_all(&dst));
        for entry in t!(fs::read_dir(&libdir)) {
            let entry = entry.unwrap();
            if let Ok(name) = entry.file_name().into_string() {
                if name.starts_with("liblldb.") && !name.ends_with(".a") {
                    if t!(entry.file_type()).is_symlink() {
                        builder.copy_to_folder(&entry.path(), &dst);
                    } else {
                       builder.install(&entry.path(), &dst, 0o755);
                    }
                }
            }
        }

        // The lldb scripts might be installed in lib/python$version
        // or in lib64/python$version.  If lib64 exists, use it;
        // otherwise lib.
        let libdir = builder.llvm_out(target).join("lib64");
        let (libdir, libdir_name) = if libdir.exists() {
            (libdir, "lib64")
        } else {
            (builder.llvm_out(target).join("lib"), "lib")
        };
        for entry in t!(fs::read_dir(&libdir)) {
            let entry = t!(entry);
            if let Ok(name) = entry.file_name().into_string() {
                if name.starts_with("python") {
                    let dst = root.join(libdir_name)
                        .join(entry.file_name());
                    t!(fs::create_dir_all(&dst));
                    builder.cp_r(&entry.path(), &dst);
                    break;
                }
            }
        }

        // Prepare the overlay
        let overlay = tmp.join("lldb-overlay");
        drop(fs::remove_dir_all(&overlay));
        builder.create_dir(&overlay);
        builder.install(&src.join("LICENSE.TXT"), &overlay, 0o644);
        builder.create(&overlay.join("version"), &builder.lldb_vers());

        // Generate the installer tarball
        let mut cmd = rust_installer(builder);
        cmd.arg("generate")
            .arg("--product-name=Rust")
            .arg("--rel-manifest-dir=rustlib")
            .arg("--success-message=lldb-installed.")
            .arg("--image-dir").arg(&image)
            .arg("--work-dir").arg(&tmpdir(builder))
            .arg("--output-dir").arg(&distdir(builder))
            .arg("--non-installed-overlay").arg(&overlay)
            .arg(format!("--package-name={}-{}", name, target))
            .arg("--legacy-manifest-dirs=rustlib,cargo")
            .arg("--component-name=lldb-preview");


        builder.run(&mut cmd);
        Some(distdir(builder).join(format!("{}-{}.tar.gz", name, target)))
    }
}