104 lines
3.2 KiB
Rust
104 lines
3.2 KiB
Rust
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::io;
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use std::io::fs;
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use std::os;
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/// Returns an absolute path in the filesystem that `path` points to. The
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/// returned path does not contain any symlinks in its hierarchy.
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pub fn realpath(original: &Path) -> io::IoResult<Path> {
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static MAX_LINKS_FOLLOWED: uint = 256;
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let original = os::make_absolute(original);
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// Right now lstat on windows doesn't work quite well
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if cfg!(windows) {
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return Ok(original)
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}
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let result = original.root_path();
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let mut result = result.expect("make_absolute has no root_path");
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let mut followed = 0;
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for part in original.components() {
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result.push(part);
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loop {
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if followed == MAX_LINKS_FOLLOWED {
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return Err(io::standard_error(io::InvalidInput))
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}
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match fs::lstat(&result) {
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Err(..) => break,
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Ok(ref stat) if stat.kind != io::TypeSymlink => break,
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Ok(..) => {
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followed += 1;
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let path = try!(fs::readlink(&result));
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result.pop();
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result.push(path);
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}
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}
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}
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}
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return Ok(result);
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}
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#[cfg(not(windows), test)]
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mod test {
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use std::io;
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use std::io::fs::{File, symlink, mkdir, mkdir_recursive};
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use super::realpath;
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use std::io::TempDir;
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#[test]
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fn realpath_works() {
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let tmpdir = TempDir::new("rustc-fs").unwrap();
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let tmpdir = realpath(tmpdir.path()).unwrap();
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let file = tmpdir.join("test");
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let dir = tmpdir.join("test2");
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let link = dir.join("link");
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let linkdir = tmpdir.join("test3");
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File::create(&file).unwrap();
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mkdir(&dir, io::UserRWX).unwrap();
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symlink(&file, &link).unwrap();
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symlink(&dir, &linkdir).unwrap();
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assert!(realpath(&tmpdir).unwrap() == tmpdir);
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assert!(realpath(&file).unwrap() == file);
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assert!(realpath(&link).unwrap() == file);
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assert!(realpath(&linkdir).unwrap() == dir);
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assert!(realpath(&linkdir.join("link")).unwrap() == file);
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}
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#[test]
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fn realpath_works_tricky() {
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let tmpdir = TempDir::new("rustc-fs").unwrap();
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let tmpdir = realpath(tmpdir.path()).unwrap();
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let a = tmpdir.join("a");
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let b = a.join("b");
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let c = b.join("c");
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let d = a.join("d");
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let e = d.join("e");
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let f = a.join("f");
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mkdir_recursive(&b, io::UserRWX).unwrap();
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mkdir_recursive(&d, io::UserRWX).unwrap();
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File::create(&f).unwrap();
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symlink(&Path::new("../d/e"), &c).unwrap();
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symlink(&Path::new("../f"), &e).unwrap();
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assert!(realpath(&c).unwrap() == f);
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assert!(realpath(&e).unwrap() == f);
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}
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}
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