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68338bc2b0
This also eliminates a use of a `Path` convenience function, in support of #80741, refactoring `std::path` to focus on pure data structures and algorithms.
91 lines
2.9 KiB
Rust
91 lines
2.9 KiB
Rust
use std::ffi::CString;
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use std::fs;
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use std::io;
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use std::path::{Path, PathBuf};
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// Unfortunately, on windows, it looks like msvcrt.dll is silently translating
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// verbatim paths under the hood to non-verbatim paths! This manifests itself as
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// gcc looking like it cannot accept paths of the form `\\?\C:\...`, but the
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// real bug seems to lie in msvcrt.dll.
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//
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// Verbatim paths are generally pretty rare, but the implementation of
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// `fs::canonicalize` currently generates paths of this form, meaning that we're
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// going to be passing quite a few of these down to gcc, so we need to deal with
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// this case.
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//
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// For now we just strip the "verbatim prefix" of `\\?\` from the path. This
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// will probably lose information in some cases, but there's not a whole lot
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// more we can do with a buggy msvcrt...
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//
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// For some more information, see this comment:
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// https://github.com/rust-lang/rust/issues/25505#issuecomment-102876737
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#[cfg(windows)]
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pub fn fix_windows_verbatim_for_gcc(p: &Path) -> PathBuf {
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use std::ffi::OsString;
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use std::path;
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let mut components = p.components();
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let prefix = match components.next() {
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Some(path::Component::Prefix(p)) => p,
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_ => return p.to_path_buf(),
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};
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match prefix.kind() {
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path::Prefix::VerbatimDisk(disk) => {
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let mut base = OsString::from(format!("{}:", disk as char));
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base.push(components.as_path());
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PathBuf::from(base)
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}
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path::Prefix::VerbatimUNC(server, share) => {
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let mut base = OsString::from(r"\\");
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base.push(server);
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base.push(r"\");
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base.push(share);
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base.push(components.as_path());
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PathBuf::from(base)
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}
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_ => p.to_path_buf(),
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}
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}
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#[cfg(not(windows))]
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pub fn fix_windows_verbatim_for_gcc(p: &Path) -> PathBuf {
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p.to_path_buf()
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}
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pub enum LinkOrCopy {
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Link,
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Copy,
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}
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/// Copies `p` into `q`, preferring to use hard-linking if possible. If
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/// `q` already exists, it is removed first.
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/// The result indicates which of the two operations has been performed.
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pub fn link_or_copy<P: AsRef<Path>, Q: AsRef<Path>>(p: P, q: Q) -> io::Result<LinkOrCopy> {
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let p = p.as_ref();
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let q = q.as_ref();
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match fs::remove_file(&q) {
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Ok(()) => (),
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Err(err) if err.kind() == io::ErrorKind::NotFound => (),
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Err(err) => return Err(err),
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}
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match fs::hard_link(p, q) {
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Ok(()) => Ok(LinkOrCopy::Link),
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Err(_) => match fs::copy(p, q) {
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Ok(_) => Ok(LinkOrCopy::Copy),
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Err(e) => Err(e),
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},
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}
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}
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#[cfg(unix)]
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pub fn path_to_c_string(p: &Path) -> CString {
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use std::ffi::OsStr;
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use std::os::unix::ffi::OsStrExt;
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let p: &OsStr = p.as_ref();
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CString::new(p.as_bytes()).unwrap()
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}
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#[cfg(windows)]
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pub fn path_to_c_string(p: &Path) -> CString {
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CString::new(p.to_str().unwrap()).unwrap()
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}
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