1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
use crate::error::{Error, Result};
use crate::gen::fs;
use crate::paths;
use std::path::Path;
pub(crate) fn write(path: impl AsRef<Path>, content: &[u8]) -> Result<()> {
let path = path.as_ref();
let mut create_dir_error = None;
if path.exists() {
if let Ok(existing) = fs::read(path) {
if existing == content {
// Avoid bumping modified time with unchanged contents.
return Ok(());
}
}
best_effort_remove(path);
} else {
let parent = path.parent().unwrap();
create_dir_error = fs::create_dir_all(parent).err();
}
match fs::write(path, content) {
// As long as write succeeded, ignore any create_dir_all error.
Ok(()) => Ok(()),
// If create_dir_all and write both failed, prefer the first error.
Err(err) => Err(Error::Fs(create_dir_error.unwrap_or(err))),
}
}
pub(crate) fn symlink_file(original: impl AsRef<Path>, link: impl AsRef<Path>) -> Result<()> {
let original = original.as_ref();
let link = link.as_ref();
let mut create_dir_error = None;
if link.exists() {
best_effort_remove(link);
} else {
let parent = link.parent().unwrap();
create_dir_error = fs::create_dir_all(parent).err();
}
match paths::symlink_or_copy(original, link) {
// As long as symlink_or_copy succeeded, ignore any create_dir_all error.
Ok(()) => Ok(()),
// If create_dir_all and symlink_or_copy both failed, prefer the first error.
Err(err) => Err(Error::Fs(create_dir_error.unwrap_or(err))),
}
}
pub(crate) fn symlink_dir(original: impl AsRef<Path>, link: impl AsRef<Path>) -> Result<()> {
let original = original.as_ref();
let link = link.as_ref();
let mut create_dir_error = None;
if link.exists() {
best_effort_remove(link);
} else {
let parent = link.parent().unwrap();
create_dir_error = fs::create_dir_all(parent).err();
}
match fs::symlink_dir(original, link) {
// As long as symlink_dir succeeded, ignore any create_dir_all error.
Ok(()) => Ok(()),
// If create_dir_all and symlink_dir both failed, prefer the first error.
Err(err) => Err(Error::Fs(create_dir_error.unwrap_or(err))),
}
}
fn best_effort_remove(path: &Path) {
use std::fs;
let file_type = match if cfg!(windows) {
// On Windows, the correct choice of remove_file vs remove_dir needs to
// be used according to what the symlink *points to*. Trying to use
// remove_file to remove a symlink which points to a directory fails
// with "Access is denied".
fs::metadata(path)
} else {
// On non-Windows, we check metadata not following symlinks. All
// symlinks are removed using remove_file.
fs::symlink_metadata(path)
} {
Ok(metadata) => metadata.file_type(),
Err(_) => return,
};
if file_type.is_dir() {
let _ = fs::remove_dir_all(path);
} else {
let _ = fs::remove_file(path);
}
}
|
