125 lines
4.3 KiB
Rust
125 lines
4.3 KiB
Rust
//! A module for searching for libraries
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use std::env;
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use std::fs;
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use std::iter::FromIterator;
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use std::path::{Path, PathBuf};
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use crate::search_paths::{PathKind, SearchPath};
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use rustc_fs_util::fix_windows_verbatim_for_gcc;
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#[derive(Copy, Clone)]
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pub enum FileMatch {
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FileMatches,
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FileDoesntMatch,
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}
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#[derive(Clone)]
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pub struct FileSearch<'a> {
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sysroot: &'a Path,
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triple: &'a str,
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search_paths: &'a [SearchPath],
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tlib_path: &'a SearchPath,
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kind: PathKind,
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}
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impl<'a> FileSearch<'a> {
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pub fn search_paths(&self) -> impl Iterator<Item = &'a SearchPath> {
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let kind = self.kind;
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self.search_paths
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.iter()
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.filter(move |sp| sp.kind.matches(kind))
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.chain(std::iter::once(self.tlib_path))
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}
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pub fn get_lib_path(&self) -> PathBuf {
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make_target_lib_path(self.sysroot, self.triple)
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}
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pub fn get_self_contained_lib_path(&self) -> PathBuf {
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self.get_lib_path().join("self-contained")
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}
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pub fn new(
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sysroot: &'a Path,
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triple: &'a str,
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search_paths: &'a [SearchPath],
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tlib_path: &'a SearchPath,
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kind: PathKind,
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) -> FileSearch<'a> {
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debug!("using sysroot = {}, triple = {}", sysroot.display(), triple);
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FileSearch { sysroot, triple, search_paths, tlib_path, kind }
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}
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/// Returns just the directories within the search paths.
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pub fn search_path_dirs(&self) -> Vec<PathBuf> {
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self.search_paths().map(|sp| sp.dir.to_path_buf()).collect()
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}
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}
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pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
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let rustlib_path = rustc_target::target_rustlib_path(sysroot, target_triple);
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PathBuf::from_iter([sysroot, Path::new(&rustlib_path), Path::new("lib")])
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}
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/// This function checks if sysroot is found using env::args().next(), and if it
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/// is not found, uses env::current_exe() to imply sysroot.
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pub fn get_or_default_sysroot() -> PathBuf {
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// Follow symlinks. If the resolved path is relative, make it absolute.
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fn canonicalize(path: PathBuf) -> PathBuf {
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let path = fs::canonicalize(&path).unwrap_or(path);
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// See comments on this target function, but the gist is that
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// gcc chokes on verbatim paths which fs::canonicalize generates
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// so we try to avoid those kinds of paths.
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fix_windows_verbatim_for_gcc(&path)
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}
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// Use env::current_exe() to get the path of the executable following
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// symlinks/canonicalizing components.
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fn from_current_exe() -> PathBuf {
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match env::current_exe() {
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Ok(exe) => {
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let mut p = canonicalize(exe);
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p.pop();
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p.pop();
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p
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}
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Err(e) => panic!("failed to get current_exe: {e}"),
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}
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}
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// Use env::args().next() to get the path of the executable without
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// following symlinks/canonicalizing any component. This makes the rustc
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// binary able to locate Rust libraries in systems using content-addressable
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// storage (CAS).
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fn from_env_args_next() -> Option<PathBuf> {
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match env::args_os().next() {
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Some(first_arg) => {
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let mut p = PathBuf::from(first_arg);
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// Check if sysroot is found using env::args().next() only if the rustc in argv[0]
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// is a symlink (see #79253). We might want to change/remove it to conform with
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// https://www.gnu.org/prep/standards/standards.html#Finding-Program-Files in the
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// future.
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if fs::read_link(&p).is_err() {
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// Path is not a symbolic link or does not exist.
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return None;
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}
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// Pop off `bin/rustc`, obtaining the suspected sysroot.
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p.pop();
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p.pop();
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// Look for the target rustlib directory in the suspected sysroot.
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let mut rustlib_path = rustc_target::target_rustlib_path(&p, "dummy");
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rustlib_path.pop(); // pop off the dummy target.
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if rustlib_path.exists() { Some(p) } else { None }
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}
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None => None,
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}
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}
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// Check if sysroot is found using env::args().next(), and if is not found,
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// use env::current_exe() to imply sysroot.
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from_env_args_next().unwrap_or_else(from_current_exe)
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}
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