1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
//! Implementation of the install aspects of the compiler.
//!
//! This module is responsible for installing the standard library,
//! compiler, and documentation.

use std::env;
use std::fs;
use std::path::{Component, Path, PathBuf};

use crate::core::build_steps::dist;
use crate::core::builder::{Builder, RunConfig, ShouldRun, Step};
use crate::core::config::{Config, TargetSelection};
use crate::utils::exec::command;
use crate::utils::helpers::t;
use crate::utils::tarball::GeneratedTarball;
use crate::{Compiler, Kind};

#[cfg(target_os = "illumos")]
const SHELL: &str = "bash";
#[cfg(not(target_os = "illumos"))]
const SHELL: &str = "sh";

/// 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.
fn sanitize_sh(path: &Path) -> String {
    let path = path.to_str().unwrap().replace('\\', "/");
    return change_drive(unc_to_lfs(&path)).unwrap_or(path);

    fn unc_to_lfs(s: &str) -> &str {
        s.strip_prefix("//?/").unwrap_or(s)
    }

    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..]))
    }
}

fn is_dir_writable_for_user(dir: &Path) -> bool {
    let tmp = dir.join(".tmp");
    match fs::create_dir_all(&tmp) {
        Ok(_) => {
            fs::remove_dir_all(tmp).unwrap();
            true
        }
        Err(e) => {
            if e.kind() == std::io::ErrorKind::PermissionDenied {
                false
            } else {
                panic!("Failed the write access check for the current user. {}", e);
            }
        }
    }
}

fn install_sh(
    builder: &Builder<'_>,
    package: &str,
    stage: u32,
    host: Option<TargetSelection>,
    tarball: &GeneratedTarball,
) {
    let _guard = builder.msg(Kind::Install, stage, package, host, host);

    let prefix = default_path(&builder.config.prefix, "/usr/local");
    let sysconfdir = prefix.join(default_path(&builder.config.sysconfdir, "/etc"));
    let destdir_env = env::var_os("DESTDIR").map(PathBuf::from);

    // Sanity checks on the write access of user.
    //
    // When the `DESTDIR` environment variable is present, there is no point to
    // check write access for `prefix` and `sysconfdir` individually, as they
    // are combined with the path from the `DESTDIR` environment variable. In
    // this case, we only need to check the `DESTDIR` path, disregarding the
    // `prefix` and `sysconfdir` paths.
    if let Some(destdir) = &destdir_env {
        assert!(is_dir_writable_for_user(destdir), "User doesn't have write access on DESTDIR.");
    } else {
        assert!(
            is_dir_writable_for_user(&prefix),
            "User doesn't have write access on `install.prefix` path in the `config.toml`.",
        );
        assert!(
            is_dir_writable_for_user(&sysconfdir),
            "User doesn't have write access on `install.sysconfdir` path in `config.toml`."
        );
    }

    let datadir = prefix.join(default_path(&builder.config.datadir, "share"));
    let docdir = prefix.join(default_path(&builder.config.docdir, &format!("share/doc/{package}")));
    let mandir = prefix.join(default_path(&builder.config.mandir, "share/man"));
    let libdir = prefix.join(default_path(&builder.config.libdir, "lib"));
    let bindir = prefix.join(&builder.config.bindir); // Default in config.rs

    let empty_dir = builder.out.join("tmp/empty_dir");
    t!(fs::create_dir_all(&empty_dir));

    let mut cmd = command(SHELL);
    cmd.current_dir(&empty_dir)
        .arg(sanitize_sh(&tarball.decompressed_output().join("install.sh")))
        .arg(format!("--prefix={}", prepare_dir(&destdir_env, prefix)))
        .arg(format!("--sysconfdir={}", prepare_dir(&destdir_env, sysconfdir)))
        .arg(format!("--datadir={}", prepare_dir(&destdir_env, datadir)))
        .arg(format!("--docdir={}", prepare_dir(&destdir_env, docdir)))
        .arg(format!("--bindir={}", prepare_dir(&destdir_env, bindir)))
        .arg(format!("--libdir={}", prepare_dir(&destdir_env, libdir)))
        .arg(format!("--mandir={}", prepare_dir(&destdir_env, mandir)))
        .arg("--disable-ldconfig");
    cmd.run(builder);
    t!(fs::remove_dir_all(&empty_dir));
}

fn default_path(config: &Option<PathBuf>, default: &str) -> PathBuf {
    config.as_ref().cloned().unwrap_or_else(|| PathBuf::from(default))
}

fn prepare_dir(destdir_env: &Option<PathBuf>, mut path: PathBuf) -> String {
    // The DESTDIR environment variable is a standard way to install software in a subdirectory
    // while keeping the original directory structure, even if the prefix or other directories
    // contain absolute paths.
    //
    // More information on the environment variable is available here:
    // https://www.gnu.org/prep/standards/html_node/DESTDIR.html
    if let Some(destdir) = destdir_env {
        let without_destdir = path.clone();
        path.clone_from(destdir);
        // Custom .join() which ignores disk roots.
        for part in without_destdir.components() {
            if let Component::Normal(s) = part {
                path.push(s)
            }
        }
    }

    // The installation command is not executed from the current directory, but from a temporary
    // directory. To prevent relative paths from breaking this converts relative paths to absolute
    // paths. std::fs::canonicalize is not used as that requires the path to actually be present.
    if path.is_relative() {
        path = std::env::current_dir().expect("failed to get the current directory").join(path);
        assert!(path.is_absolute(), "could not make the path relative");
    }

    sanitize_sh(&path)
}

macro_rules! install {
    (($sel:ident, $builder:ident, $_config:ident),
       $($name:ident,
       $condition_name: ident = $path_or_alias: literal,
       $default_cond:expr,
       only_hosts: $only_hosts:expr,
       $run_item:block $(, $c:ident)*;)+) => {
        $(
            #[derive(Debug, Clone, Hash, PartialEq, Eq)]
        pub struct $name {
            pub compiler: Compiler,
            pub target: TargetSelection,
        }

        impl $name {
            #[allow(dead_code)]
            fn should_build(config: &Config) -> bool {
                config.extended && config.tools.as_ref()
                    .map_or(true, |t| t.contains($path_or_alias))
            }
        }

        impl Step for $name {
            type Output = ();
            const DEFAULT: bool = true;
            const ONLY_HOSTS: bool = $only_hosts;
            $(const $c: bool = true;)*

            fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
                let $_config = &run.builder.config;
                run.$condition_name($path_or_alias).default_condition($default_cond)
            }

            fn make_run(run: RunConfig<'_>) {
                run.builder.ensure($name {
                    compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
                    target: run.target,
                });
            }

            fn run($sel, $builder: &Builder<'_>) {
                $run_item
            }
        })+
    }
}

install!((self, builder, _config),
    Docs, path = "src/doc", _config.docs, only_hosts: false, {
        let tarball = builder.ensure(dist::Docs { host: self.target }).expect("missing docs");
        install_sh(builder, "docs", self.compiler.stage, Some(self.target), &tarball);
    };
    Std, path = "library/std", true, only_hosts: false, {
        // `expect` should be safe, only None when host != build, but this
        // only runs when host == build
        let tarball = builder.ensure(dist::Std {
            compiler: self.compiler,
            target: self.target
        }).expect("missing std");
        install_sh(builder, "std", self.compiler.stage, Some(self.target), &tarball);
    };
    Cargo, alias = "cargo", Self::should_build(_config), only_hosts: true, {
        let tarball = builder
            .ensure(dist::Cargo { compiler: self.compiler, target: self.target })
            .expect("missing cargo");
        install_sh(builder, "cargo", self.compiler.stage, Some(self.target), &tarball);
    };
    RustAnalyzer, alias = "rust-analyzer", Self::should_build(_config), only_hosts: true, {
        if let Some(tarball) =
            builder.ensure(dist::RustAnalyzer { compiler: self.compiler, target: self.target })
        {
            install_sh(builder, "rust-analyzer", self.compiler.stage, Some(self.target), &tarball);
        } else {
            builder.info(
                &format!("skipping Install rust-analyzer stage{} ({})", self.compiler.stage, self.target),
            );
        }
    };
    Clippy, alias = "clippy", Self::should_build(_config), only_hosts: true, {
        let tarball = builder
            .ensure(dist::Clippy { compiler: self.compiler, target: self.target })
            .expect("missing clippy");
        install_sh(builder, "clippy", self.compiler.stage, Some(self.target), &tarball);
    };
    Miri, alias = "miri", Self::should_build(_config), only_hosts: true, {
        if let Some(tarball) = builder.ensure(dist::Miri { compiler: self.compiler, target: self.target }) {
            install_sh(builder, "miri", self.compiler.stage, Some(self.target), &tarball);
        } else {
            // Miri is only available on nightly
            builder.info(
                &format!("skipping Install miri stage{} ({})", self.compiler.stage, self.target),
            );
        }
    };
    LlvmTools, alias = "llvm-tools", Self::should_build(_config), only_hosts: true, {
        if let Some(tarball) = builder.ensure(dist::LlvmTools { target: self.target }) {
            install_sh(builder, "llvm-tools", self.compiler.stage, Some(self.target), &tarball);
        } else {
            builder.info(
                &format!("skipping llvm-tools stage{} ({}): external LLVM", self.compiler.stage, self.target),
            );
        }
    };
    Rustfmt, alias = "rustfmt", Self::should_build(_config), only_hosts: true, {
        if let Some(tarball) = builder.ensure(dist::Rustfmt {
            compiler: self.compiler,
            target: self.target
        }) {
            install_sh(builder, "rustfmt", self.compiler.stage, Some(self.target), &tarball);
        } else {
            builder.info(
                &format!("skipping Install Rustfmt stage{} ({})", self.compiler.stage, self.target),
            );
        }
    };
    Rustc, path = "compiler/rustc", true, only_hosts: true, {
        let tarball = builder.ensure(dist::Rustc {
            compiler: builder.compiler(builder.top_stage, self.target),
        });
        install_sh(builder, "rustc", self.compiler.stage, Some(self.target), &tarball);
    };
    RustcCodegenCranelift, alias = "rustc-codegen-cranelift", Self::should_build(_config), only_hosts: true, {
        if let Some(tarball) = builder.ensure(dist::CodegenBackend {
            compiler: self.compiler,
            backend: "cranelift".to_string(),
        }) {
            install_sh(builder, "rustc-codegen-cranelift", self.compiler.stage, Some(self.target), &tarball);
        } else {
            builder.info(
                &format!("skipping Install CodegenBackend(\"cranelift\") stage{} ({})",
                         self.compiler.stage, self.target),
            );
        }
    };
    LlvmBitcodeLinker, alias = "llvm-bitcode-linker", Self::should_build(_config), only_hosts: true, {
        if let Some(tarball) = builder.ensure(dist::LlvmBitcodeLinker { compiler: self.compiler, target: self.target }) {
            install_sh(builder, "llvm-bitcode-linker", self.compiler.stage, Some(self.target), &tarball);
        } else {
            builder.info(
                &format!("skipping llvm-bitcode-linker stage{} ({})", self.compiler.stage, self.target),
            );
        }
    };
);

#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct Src {
    pub stage: u32,
}

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

    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
        let config = &run.builder.config;
        let cond = config.extended && config.tools.as_ref().map_or(true, |t| t.contains("src"));
        run.path("src").default_condition(cond)
    }

    fn make_run(run: RunConfig<'_>) {
        run.builder.ensure(Src { stage: run.builder.top_stage });
    }

    fn run(self, builder: &Builder<'_>) {
        let tarball = builder.ensure(dist::Src);
        install_sh(builder, "src", self.stage, None, &tarball);
    }
}