vendor/gix-fs/src/symlink.rs

   1 use std::{io, io::ErrorKind::AlreadyExists, path::Path};
   2
   3 #[cfg(not(windows))]
   4 /// Create a new symlink at `link` which points to `original`.
   5 pub fn create(original: &Path, link: &Path) -> io::Result<()> {
   6     std::os::unix::fs::symlink(original, link)
   7 }
   8
   9 #[cfg(not(windows))]
  10 /// Remove a symlink.
  11 ///
  12 /// Note that on only on windows this is special.
  13 pub fn remove(path: &Path) -> io::Result<()> {
  14     std::fs::remove_file(path)
  15 }
  16
  17 // TODO: use the `symlink` crate once it can delete directory symlinks
  18 /// Remove a symlink.
  19 #[cfg(windows)]
  20 pub fn remove(path: &Path) -> io::Result<()> {
  21     if let Ok(meta) = std::fs::metadata(path) {
  22         if meta.is_file() {
  23             std::fs::remove_file(path) // this removes the link itself
  24         } else {
  25             std::fs::remove_dir(path) // however, this sees the destination directory, which isn't the right thing actually
  26         }
  27     } else {
  28         std::fs::remove_file(path).or_else(|_| std::fs::remove_dir(path))
  29     }
  30 }
  31
  32 #[cfg(windows)]
  33 /// Create a new symlink at `link` which points to `original`.
  34 pub fn create(original: &Path, link: &Path) -> io::Result<()> {
  35     use std::os::windows::fs::{symlink_dir, symlink_file};
  36     // TODO: figure out if links to links count as files or whatever they point at
  37     if std::fs::metadata(link.parent().expect("dir for link").join(original))?.is_dir() {
  38         symlink_dir(original, link)
  39     } else {
  40         symlink_file(original, link)
  41     }
  42 }
  43
  44 #[cfg(not(windows))]
  45 /// Return true if `err` indicates that a file collision happened, i.e. a symlink couldn't be created as the `link`
  46 /// already exists as filesystem object.
  47 pub fn is_collision_error(err: &std::io::Error) -> bool {
  48     // TODO: use ::IsDirectory as well when stabilized instead of raw_os_error(), and ::FileSystemLoop respectively
  49     err.kind() == AlreadyExists
  50             || err.raw_os_error() == Some(21)
  51             || err.raw_os_error() == Some(62) // no-follow on symlnk on mac-os
  52             || err.raw_os_error() == Some(40) // no-follow on symlnk on ubuntu
  53 }
  54
  55 #[cfg(windows)]
  56 /// Return true if `err` indicates that a file collision happened, i.e. a symlink couldn't be created as the `link`
  57 /// already exists as filesystem object.
  58 pub fn is_collision_error(err: &std::io::Error) -> bool {
  59     err.kind() == AlreadyExists || err.kind() == std::io::ErrorKind::PermissionDenied
  60 }