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1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 #![allow(non_camel_case_types)]
12
13 pub use self::FileMatch::*;
14
15 use std::collections::HashSet;
16 use std::env;
17 use std::fs;
18 use std::io::prelude::*;
19 use std::path::{Path, PathBuf};
20
21 use session::search_paths::{SearchPaths, PathKind};
22 use util::fs as rustcfs;
23
24 #[derive(Copy, Clone)]
25 pub enum FileMatch {
26 FileMatches,
27 FileDoesntMatch,
28 }
29
30 // A module for searching for libraries
31 // FIXME (#2658): I'm not happy how this module turned out. Should
32 // probably just be folded into cstore.
33
34 pub struct FileSearch<'a> {
35 pub sysroot: &'a Path,
36 pub search_paths: &'a SearchPaths,
37 pub triple: &'a str,
38 pub kind: PathKind,
39 }
40
41 impl<'a> FileSearch<'a> {
42 pub fn for_each_lib_search_path<F>(&self, mut f: F) where
43 F: FnMut(&Path, PathKind)
44 {
45 let mut visited_dirs = HashSet::new();
46
47 for (path, kind) in self.search_paths.iter(self.kind) {
48 f(path, kind);
49 visited_dirs.insert(path.to_path_buf());
50 }
51
52 debug!("filesearch: searching lib path");
53 let tlib_path = make_target_lib_path(self.sysroot,
54 self.triple);
55 if !visited_dirs.contains(&tlib_path) {
56 f(&tlib_path, PathKind::All);
57 }
58
59 visited_dirs.insert(tlib_path);
60 }
61
62 pub fn get_lib_path(&self) -> PathBuf {
63 make_target_lib_path(self.sysroot, self.triple)
64 }
65
66 pub fn search<F>(&self, mut pick: F)
67 where F: FnMut(&Path, PathKind) -> FileMatch
68 {
69 self.for_each_lib_search_path(|lib_search_path, kind| {
70 debug!("searching {}", lib_search_path.display());
71 match fs::read_dir(lib_search_path) {
72 Ok(files) => {
73 let files = files.filter_map(|p| p.ok().map(|s| s.path()))
74 .collect::<Vec<_>>();
75 fn is_rlib(p: &Path) -> bool {
76 p.extension().and_then(|s| s.to_str()) == Some("rlib")
77 }
78 // Reading metadata out of rlibs is faster, and if we find both
79 // an rlib and a dylib we only read one of the files of
80 // metadata, so in the name of speed, bring all rlib files to
81 // the front of the search list.
82 let files1 = files.iter().filter(|p| is_rlib(p));
83 let files2 = files.iter().filter(|p| !is_rlib(p));
84 for path in files1.chain(files2) {
85 debug!("testing {}", path.display());
86 let maybe_picked = pick(path, kind);
87 match maybe_picked {
88 FileMatches => {
89 debug!("picked {}", path.display());
90 }
91 FileDoesntMatch => {
92 debug!("rejected {}", path.display());
93 }
94 }
95 }
96 }
97 Err(..) => (),
98 }
99 });
100 }
101
102 pub fn new(sysroot: &'a Path,
103 triple: &'a str,
104 search_paths: &'a SearchPaths,
105 kind: PathKind) -> FileSearch<'a> {
106 debug!("using sysroot = {}, triple = {}", sysroot.display(), triple);
107 FileSearch {
108 sysroot: sysroot,
109 search_paths: search_paths,
110 triple: triple,
111 kind: kind,
112 }
113 }
114
115 // Returns a list of directories where target-specific dylibs might be located.
116 pub fn get_dylib_search_paths(&self) -> Vec<PathBuf> {
117 let mut paths = Vec::new();
118 self.for_each_lib_search_path(|lib_search_path, _| {
119 paths.push(lib_search_path.to_path_buf());
120 });
121 paths
122 }
123
124 // Returns a list of directories where target-specific tool binaries are located.
125 pub fn get_tools_search_paths(&self) -> Vec<PathBuf> {
126 let mut p = PathBuf::from(self.sysroot);
127 p.push(&find_libdir(self.sysroot));
128 p.push(&rustlibdir());
129 p.push(&self.triple);
130 p.push("bin");
131 vec![p]
132 }
133 }
134
135 pub fn relative_target_lib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
136 let mut p = PathBuf::from(&find_libdir(sysroot));
137 assert!(p.is_relative());
138 p.push(&rustlibdir());
139 p.push(target_triple);
140 p.push("lib");
141 p
142 }
143
144 fn make_target_lib_path(sysroot: &Path,
145 target_triple: &str) -> PathBuf {
146 sysroot.join(&relative_target_lib_path(sysroot, target_triple))
147 }
148
149 pub fn get_or_default_sysroot() -> PathBuf {
150 // Follow symlinks. If the resolved path is relative, make it absolute.
151 fn canonicalize(path: Option<PathBuf>) -> Option<PathBuf> {
152 path.and_then(|path| {
153 match fs::canonicalize(&path) {
154 // See comments on this target function, but the gist is that
155 // gcc chokes on verbatim paths which fs::canonicalize generates
156 // so we try to avoid those kinds of paths.
157 Ok(canon) => Some(rustcfs::fix_windows_verbatim_for_gcc(&canon)),
158 Err(e) => bug!("failed to get realpath: {}", e),
159 }
160 })
161 }
162
163 match canonicalize(env::current_exe().ok()) {
164 Some(mut p) => { p.pop(); p.pop(); p }
165 None => bug!("can't determine value for sysroot")
166 }
167 }
168
169 // The name of the directory rustc expects libraries to be located.
170 fn find_libdir(sysroot: &Path) -> String {
171 // FIXME: This is a quick hack to make the rustc binary able to locate
172 // Rust libraries in Linux environments where libraries might be installed
173 // to lib64/lib32. This would be more foolproof by basing the sysroot off
174 // of the directory where librustc is located, rather than where the rustc
175 // binary is.
176 //If --libdir is set during configuration to the value other than
177 // "lib" (i.e. non-default), this value is used (see issue #16552).
178
179 match option_env!("CFG_LIBDIR_RELATIVE") {
180 Some(libdir) if libdir != "lib" => return libdir.to_string(),
181 _ => if sysroot.join(&primary_libdir_name()).join(&rustlibdir()).exists() {
182 return primary_libdir_name();
183 } else {
184 return secondary_libdir_name();
185 }
186 }
187
188 #[cfg(target_pointer_width = "64")]
189 fn primary_libdir_name() -> String {
190 "lib64".to_string()
191 }
192
193 #[cfg(target_pointer_width = "32")]
194 fn primary_libdir_name() -> String {
195 "lib32".to_string()
196 }
197
198 fn secondary_libdir_name() -> String {
199 "lib".to_string()
200 }
201 }
202
203 // The name of rustc's own place to organize libraries.
204 // Used to be "rustc", now the default is "rustlib"
205 pub fn rustlibdir() -> String {
206 "rustlib".to_string()
207 }