| pub use self::FileMatch::*; |
| |
| use std::borrow::Cow; |
| use std::env; |
| use std::fs; |
| use std::path::{Path, PathBuf}; |
| |
| use crate::search_paths::{PathKind, SearchPath, SearchPathFile}; |
| use rustc_fs_util::fix_windows_verbatim_for_gcc; |
| use tracing::debug; |
| |
| #[derive(Copy, Clone)] |
| pub enum FileMatch { |
| FileMatches, |
| FileDoesntMatch, |
| } |
| |
| // A module for searching for libraries |
| |
| #[derive(Clone)] |
| pub struct FileSearch<'a> { |
| sysroot: &'a Path, |
| triple: &'a str, |
| search_paths: &'a [SearchPath], |
| tlib_path: &'a SearchPath, |
| kind: PathKind, |
| } |
| |
| impl<'a> FileSearch<'a> { |
| pub fn search_paths(&self) -> impl Iterator<Item = &'a SearchPath> { |
| let kind = self.kind; |
| self.search_paths |
| .iter() |
| .filter(move |sp| sp.kind.matches(kind)) |
| .chain(std::iter::once(self.tlib_path)) |
| } |
| |
| pub fn get_lib_path(&self) -> PathBuf { |
| make_target_lib_path(self.sysroot, self.triple) |
| } |
| |
| pub fn get_self_contained_lib_path(&self) -> PathBuf { |
| self.get_lib_path().join("self-contained") |
| } |
| |
| pub fn search<F>(&self, mut pick: F) |
| where |
| F: FnMut(&SearchPathFile, PathKind) -> FileMatch, |
| { |
| for search_path in self.search_paths() { |
| debug!("searching {}", search_path.dir.display()); |
| fn is_rlib(spf: &SearchPathFile) -> bool { |
| if let Some(f) = &spf.file_name_str { f.ends_with(".rlib") } else { false } |
| } |
| // Reading metadata out of rlibs is faster, and if we find both |
| // an rlib and a dylib we only read one of the files of |
| // metadata, so in the name of speed, bring all rlib files to |
| // the front of the search list. |
| let files1 = search_path.files.iter().filter(|spf| is_rlib(&spf)); |
| let files2 = search_path.files.iter().filter(|spf| !is_rlib(&spf)); |
| for spf in files1.chain(files2) { |
| debug!("testing {}", spf.path.display()); |
| let maybe_picked = pick(spf, search_path.kind); |
| match maybe_picked { |
| FileMatches => { |
| debug!("picked {}", spf.path.display()); |
| } |
| FileDoesntMatch => { |
| debug!("rejected {}", spf.path.display()); |
| } |
| } |
| } |
| } |
| } |
| |
| pub fn new( |
| sysroot: &'a Path, |
| triple: &'a str, |
| search_paths: &'a [SearchPath], |
| tlib_path: &'a SearchPath, |
| kind: PathKind, |
| ) -> FileSearch<'a> { |
| debug!("using sysroot = {}, triple = {}", sysroot.display(), triple); |
| FileSearch { sysroot, triple, search_paths, tlib_path, kind } |
| } |
| |
| // Returns just the directories within the search paths. |
| pub fn search_path_dirs(&self) -> Vec<PathBuf> { |
| self.search_paths().map(|sp| sp.dir.to_path_buf()).collect() |
| } |
| |
| // Returns a list of directories where target-specific tool binaries are located. |
| pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> { |
| let mut p = PathBuf::from(self.sysroot); |
| p.push(find_libdir(self.sysroot).as_ref()); |
| p.push(RUST_LIB_DIR); |
| p.push(&self.triple); |
| p.push("bin"); |
| if self_contained { vec![p.clone(), p.join("self-contained")] } else { vec![p] } |
| } |
| } |
| |
| pub fn relative_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf { |
| let mut p = PathBuf::from(find_libdir(sysroot).as_ref()); |
| assert!(p.is_relative()); |
| p.push(RUST_LIB_DIR); |
| p.push(target_triple); |
| p.push("lib"); |
| p |
| } |
| |
| pub fn make_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf { |
| sysroot.join(&relative_target_lib_path(sysroot, target_triple)) |
| } |
| |
| // This function checks if sysroot is found using env::args().next(), and if it |
| // is not found, uses env::current_exe() to imply sysroot. |
| pub fn get_or_default_sysroot() -> PathBuf { |
| // Follow symlinks. If the resolved path is relative, make it absolute. |
| fn canonicalize(path: PathBuf) -> PathBuf { |
| let path = fs::canonicalize(&path).unwrap_or(path); |
| // See comments on this target function, but the gist is that |
| // gcc chokes on verbatim paths which fs::canonicalize generates |
| // so we try to avoid those kinds of paths. |
| fix_windows_verbatim_for_gcc(&path) |
| } |
| |
| // Use env::current_exe() to get the path of the executable following |
| // symlinks/canonicalizing components. |
| fn from_current_exe() -> PathBuf { |
| match env::current_exe() { |
| Ok(exe) => { |
| let mut p = canonicalize(exe); |
| p.pop(); |
| p.pop(); |
| p |
| } |
| Err(e) => panic!("failed to get current_exe: {}", e), |
| } |
| } |
| |
| // Use env::args().next() to get the path of the executable without |
| // following symlinks/canonicalizing any component. This makes the rustc |
| // binary able to locate Rust libraries in systems using content-addressable |
| // storage (CAS). |
| fn from_env_args_next() -> Option<PathBuf> { |
| match env::args_os().next() { |
| Some(first_arg) => { |
| let mut p = PathBuf::from(first_arg); |
| |
| // Check if sysroot is found using env::args().next() only if the rustc in argv[0] |
| // is a symlink (see #79253). We might want to change/remove it to conform with |
| // https://www.gnu.org/prep/standards/standards.html#Finding-Program-Files in the |
| // future. |
| if fs::read_link(&p).is_err() { |
| // Path is not a symbolic link or does not exist. |
| return None; |
| } |
| |
| p.pop(); |
| p.pop(); |
| let mut libdir = PathBuf::from(&p); |
| libdir.push(find_libdir(&p).as_ref()); |
| if libdir.exists() { Some(p) } else { None } |
| } |
| None => None, |
| } |
| } |
| |
| // Check if sysroot is found using env::args().next(), and if is not found, |
| // use env::current_exe() to imply sysroot. |
| from_env_args_next().unwrap_or_else(from_current_exe) |
| } |
| |
| // The name of the directory rustc expects libraries to be located. |
| fn find_libdir(sysroot: &Path) -> Cow<'static, str> { |
| // FIXME: This is a quick hack to make the rustc binary able to locate |
| // Rust libraries in Linux environments where libraries might be installed |
| // to lib64/lib32. This would be more foolproof by basing the sysroot off |
| // of the directory where `librustc_driver` is located, rather than |
| // where the rustc binary is. |
| // If --libdir is set during configuration to the value other than |
| // "lib" (i.e., non-default), this value is used (see issue #16552). |
| |
| #[cfg(target_pointer_width = "64")] |
| const PRIMARY_LIB_DIR: &str = "lib64"; |
| |
| #[cfg(target_pointer_width = "32")] |
| const PRIMARY_LIB_DIR: &str = "lib32"; |
| |
| const SECONDARY_LIB_DIR: &str = "lib"; |
| |
| match option_env!("CFG_LIBDIR_RELATIVE") { |
| None | Some("lib") => { |
| if sysroot.join(PRIMARY_LIB_DIR).join(RUST_LIB_DIR).exists() { |
| PRIMARY_LIB_DIR.into() |
| } else { |
| SECONDARY_LIB_DIR.into() |
| } |
| } |
| Some(libdir) => libdir.into(), |
| } |
| } |
| |
| // The name of rustc's own place to organize libraries. |
| // Used to be "rustc", now the default is "rustlib" |
| const RUST_LIB_DIR: &str = "rustlib"; |