1 //! Various utility functions used throughout rustbuild.
3 //! Simple things like testing the various filesystem operations here and there,
4 //! not a lot of interesting happenings here unfortunately.
9 use std::path::{Path, PathBuf};
10 use std::process::Command;
12 use std::time::Instant;
16 use crate::builder::Builder;
17 use crate::config::{Config, TargetSelection};
19 /// Returns the `name` as the filename of a static library for `target`.
20 pub fn staticlib(name: &str, target: TargetSelection) -> String {
21 if target.contains("windows") { format!("{}.lib", name) } else { format!("lib{}.a", name) }
24 /// Given an executable called `name`, return the filename for the
25 /// executable for a particular target.
26 pub fn exe(name: &str, target: TargetSelection) -> String {
27 if target.contains("windows") { format!("{}.exe", name) } else { name.to_string() }
30 /// Returns `true` if the file name given looks like a dynamic library.
31 pub fn is_dylib(name: &str) -> bool {
32 name.ends_with(".dylib") || name.ends_with(".so") || name.ends_with(".dll")
35 /// Returns `true` if the file name given looks like a debug info file
36 pub fn is_debug_info(name: &str) -> bool {
37 // FIXME: consider split debug info on other platforms (e.g., Linux, macOS)
38 name.ends_with(".pdb")
41 /// Returns the corresponding relative library directory that the compiler's
42 /// dylibs will be found in.
43 pub fn libdir(target: TargetSelection) -> &'static str {
44 if target.contains("windows") { "bin" } else { "lib" }
47 /// Adds a list of lookup paths to `cmd`'s dynamic library lookup path.
48 /// If The dylib_path_par is already set for this cmd, the old value will be overwritten!
49 pub fn add_dylib_path(path: Vec<PathBuf>, cmd: &mut Command) {
50 let mut list = dylib_path();
54 cmd.env(dylib_path_var(), t!(env::join_paths(list)));
57 /// Returns the environment variable which the dynamic library lookup path
58 /// resides in for this platform.
59 pub fn dylib_path_var() -> &'static str {
60 if cfg!(target_os = "windows") {
62 } else if cfg!(target_os = "macos") {
64 } else if cfg!(target_os = "haiku") {
71 /// Parses the `dylib_path_var()` environment variable, returning a list of
72 /// paths that are members of this lookup path.
73 pub fn dylib_path() -> Vec<PathBuf> {
74 let var = match env::var_os(dylib_path_var()) {
76 None => return vec![],
78 env::split_paths(&var).collect()
81 /// Adds a list of lookup paths to `cmd`'s link library lookup path.
82 pub fn add_link_lib_path(path: Vec<PathBuf>, cmd: &mut Command) {
83 let mut list = link_lib_path();
87 cmd.env(link_lib_path_var(), t!(env::join_paths(list)));
90 /// Returns the environment variable which the link library lookup path
91 /// resides in for this platform.
92 fn link_lib_path_var() -> &'static str {
93 if cfg!(target_env = "msvc") { "LIB" } else { "LIBRARY_PATH" }
96 /// Parses the `link_lib_path_var()` environment variable, returning a list of
97 /// paths that are members of this lookup path.
98 fn link_lib_path() -> Vec<PathBuf> {
99 let var = match env::var_os(link_lib_path_var()) {
101 None => return vec![],
103 env::split_paths(&var).collect()
106 /// `push` all components to `buf`. On windows, append `.exe` to the last component.
107 pub fn push_exe_path(mut buf: PathBuf, components: &[&str]) -> PathBuf {
108 let (&file, components) = components.split_last().expect("at least one component required");
109 let mut file = file.to_owned();
112 file.push_str(".exe");
115 buf.extend(components);
121 pub struct TimeIt(bool, Instant);
123 /// Returns an RAII structure that prints out how long it took to drop.
124 pub fn timeit(builder: &Builder<'_>) -> TimeIt {
125 TimeIt(builder.config.dry_run, Instant::now())
128 impl Drop for TimeIt {
130 let time = self.1.elapsed();
132 println!("\tfinished in {}.{:03} seconds", time.as_secs(), time.subsec_millis());
137 /// Symlinks two directories, using junctions on Windows and normal symlinks on
139 pub fn symlink_dir(config: &Config, src: &Path, dest: &Path) -> io::Result<()> {
143 let _ = fs::remove_dir(dest);
144 return symlink_dir_inner(src, dest);
147 fn symlink_dir_inner(src: &Path, dest: &Path) -> io::Result<()> {
148 use std::os::unix::fs;
149 fs::symlink(src, dest)
152 // Creating a directory junction on windows involves dealing with reparse
153 // points and the DeviceIoControl function, and this code is a skeleton of
154 // what can be found here:
156 // http://www.flexhex.com/docs/articles/hard-links.phtml
158 fn symlink_dir_inner(target: &Path, junction: &Path) -> io::Result<()> {
160 use std::os::windows::ffi::OsStrExt;
163 use winapi::shared::minwindef::{DWORD, WORD};
164 use winapi::um::fileapi::{CreateFileW, OPEN_EXISTING};
165 use winapi::um::handleapi::CloseHandle;
166 use winapi::um::ioapiset::DeviceIoControl;
167 use winapi::um::winbase::{FILE_FLAG_BACKUP_SEMANTICS, FILE_FLAG_OPEN_REPARSE_POINT};
168 use winapi::um::winioctl::FSCTL_SET_REPARSE_POINT;
169 use winapi::um::winnt::{
170 FILE_SHARE_DELETE, FILE_SHARE_READ, FILE_SHARE_WRITE, GENERIC_WRITE,
171 IO_REPARSE_TAG_MOUNT_POINT, MAXIMUM_REPARSE_DATA_BUFFER_SIZE, WCHAR,
174 #[allow(non_snake_case)]
176 struct REPARSE_MOUNTPOINT_DATA_BUFFER {
178 ReparseDataLength: DWORD,
180 ReparseTargetLength: WORD,
181 ReparseTargetMaximumLength: WORD,
183 ReparseTarget: WCHAR,
186 fn to_u16s<S: AsRef<OsStr>>(s: S) -> io::Result<Vec<u16>> {
187 Ok(s.as_ref().encode_wide().chain(Some(0)).collect())
190 // We're using low-level APIs to create the junction, and these are more
191 // picky about paths. For example, forward slashes cannot be used as a
192 // path separator, so we should try to canonicalize the path first.
193 let target = fs::canonicalize(target)?;
195 fs::create_dir(junction)?;
197 let path = to_u16s(junction)?;
203 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
206 FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS,
210 let mut data = [0u8; MAXIMUM_REPARSE_DATA_BUFFER_SIZE as usize];
211 let db = data.as_mut_ptr() as *mut REPARSE_MOUNTPOINT_DATA_BUFFER;
212 let buf = &mut (*db).ReparseTarget as *mut u16;
214 // FIXME: this conversion is very hacky
216 let v = v.iter().map(|x| *x as u16);
217 for c in v.chain(target.as_os_str().encode_wide().skip(4)) {
223 (*db).ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
224 (*db).ReparseTargetMaximumLength = (i * 2) as WORD;
225 (*db).ReparseTargetLength = ((i - 1) * 2) as WORD;
226 (*db).ReparseDataLength = (*db).ReparseTargetLength as DWORD + 12;
229 let res = DeviceIoControl(
231 FSCTL_SET_REPARSE_POINT,
232 data.as_ptr() as *mut _,
233 (*db).ReparseDataLength + 8,
240 let out = if res == 0 { Err(io::Error::last_os_error()) } else { Ok(()) };
247 /// The CI environment rustbuild is running in. This mainly affects how the logs
249 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
251 /// Not a CI environment.
253 /// The Azure Pipelines environment, for Linux (including Docker), Windows, and macOS builds.
255 /// The GitHub Actions environment, for Linux (including Docker), Windows and macOS builds.
260 /// Obtains the current CI environment.
261 pub fn current() -> CiEnv {
262 if env::var("TF_BUILD").map_or(false, |e| e == "True") {
263 CiEnv::AzurePipelines
264 } else if env::var("GITHUB_ACTIONS").map_or(false, |e| e == "true") {
271 /// If in a CI environment, forces the command to run with colors.
272 pub fn force_coloring_in_ci(self, cmd: &mut Command) {
273 if self != CiEnv::None {
274 // Due to use of stamp/docker, the output stream of rustbuild is not
275 // a TTY in CI, so coloring is by-default turned off.
276 // The explicit `TERM=xterm` environment is needed for
277 // `--color always` to actually work. This env var was lost when
278 // compiling through the Makefile. Very strange.
279 cmd.env("TERM", "xterm").args(&["--color", "always"]);
284 pub fn forcing_clang_based_tests() -> bool {
285 if let Some(var) = env::var_os("RUSTBUILD_FORCE_CLANG_BASED_TESTS") {
286 match &var.to_string_lossy().to_lowercase()[..] {
287 "1" | "yes" | "on" => true,
288 "0" | "no" | "off" => false,
290 // Let's make sure typos don't go unnoticed
292 "Unrecognized option '{}' set in \
293 RUSTBUILD_FORCE_CLANG_BASED_TESTS",
303 pub fn use_host_linker(target: TargetSelection) -> bool {
304 // FIXME: this information should be gotten by checking the linker flavor
305 // of the rustc target
306 !(target.contains("emscripten")
307 || target.contains("wasm32")
308 || target.contains("nvptx")
309 || target.contains("fortanix")
310 || target.contains("fuchsia")
311 || target.contains("bpf"))