std/sys/fs/
common.rs

1#![allow(dead_code)] // not used on all platforms
2
3use crate::io::{self, Error, ErrorKind};
4use crate::path::{Path, PathBuf};
5use crate::sys::fs::{File, OpenOptions};
6use crate::sys::helpers::ignore_notfound;
7use crate::{fmt, fs};
8
9pub(crate) const NOT_FILE_ERROR: Error = io::const_error!(
10    ErrorKind::InvalidInput,
11    "the source path is neither a regular file nor a symlink to a regular file",
12);
13
14pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
15    let mut reader = fs::File::open(from)?;
16    let metadata = reader.metadata()?;
17
18    if !metadata.is_file() {
19        return Err(NOT_FILE_ERROR);
20    }
21
22    let mut writer = fs::File::create(to)?;
23    let perm = metadata.permissions();
24
25    let ret = io::copy(&mut reader, &mut writer)?;
26    writer.set_permissions(perm)?;
27    Ok(ret)
28}
29
30pub fn remove_dir_all(path: &Path) -> io::Result<()> {
31    let filetype = fs::symlink_metadata(path)?.file_type();
32    if filetype.is_symlink() { fs::remove_file(path) } else { remove_dir_all_recursive(path) }
33}
34
35fn remove_dir_all_recursive(path: &Path) -> io::Result<()> {
36    for child in fs::read_dir(path)? {
37        let result: io::Result<()> = try {
38            let child = child?;
39            if child.file_type()?.is_dir() {
40                remove_dir_all_recursive(&child.path())?;
41            } else {
42                fs::remove_file(&child.path())?;
43            }
44        };
45        // ignore internal NotFound errors to prevent race conditions
46        if let Err(err) = &result
47            && err.kind() != io::ErrorKind::NotFound
48        {
49            return result;
50        }
51    }
52    ignore_notfound(fs::remove_dir(path))
53}
54
55pub fn exists(path: &Path) -> io::Result<bool> {
56    match fs::metadata(path) {
57        Ok(_) => Ok(true),
58        Err(error) if error.kind() == io::ErrorKind::NotFound => Ok(false),
59        Err(error) => Err(error),
60    }
61}
62
63pub struct Dir {
64    path: PathBuf,
65}
66
67impl Dir {
68    pub fn open(path: &Path, _opts: &OpenOptions) -> io::Result<Self> {
69        path.canonicalize().map(|path| Self { path })
70    }
71
72    pub fn open_file(&self, path: &Path, opts: &OpenOptions) -> io::Result<File> {
73        File::open(&self.path.join(path), &opts)
74    }
75}
76
77impl fmt::Debug for Dir {
78    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
79        f.debug_struct("Dir").field("path", &self.path).finish()
80    }
81}
std/sys/fs/common.rs

std/sys/fs/
common.rs
