blob: b3ba24c82ea686afd61792e54fbce5c81f0ef061 (
plain)
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
|
//! Policy for what gets backed up.
use crate::backup_reason::Reason;
use crate::fsentry::FilesystemEntry;
use crate::generation::LocalGeneration;
use log::warn;
/// Policy for what gets backed up.
///
/// The policy allows two aspects to be controlled:
///
/// * should new files )(files that didn't exist in the previous
/// backup be included in the new backup?
/// * should files that haven't been changed since the previous backup
/// be included in the new backup?
///
/// If policy doesn't allow a file to be included, it's skipped.
pub struct BackupPolicy {
new: bool,
old_if_changed: bool,
}
impl BackupPolicy {
/// Create a default policy.
pub fn default() -> Self {
Self {
new: true,
old_if_changed: true,
}
}
/// Does a given file need to be backed up?
pub fn needs_backup(&self, old: &LocalGeneration, new_entry: &FilesystemEntry) -> Reason {
let new_name = new_entry.pathbuf();
match old.get_file(&new_name) {
Ok(None) => {
if self.new {
Reason::IsNew
} else {
Reason::Skipped
}
}
Ok(Some(old_entry)) => {
if self.old_if_changed {
if file_has_changed(&old_entry, new_entry) {
Reason::Changed
} else {
Reason::Unchanged
}
} else {
Reason::Skipped
}
}
Err(err) => {
warn!(
"needs_backup: lookup in old generation returned error, ignored: {:?}: {}",
new_name, err
);
Reason::GenerationLookupError
}
}
}
}
fn file_has_changed(old: &FilesystemEntry, new: &FilesystemEntry) -> bool {
let unchanged = old.kind() == new.kind()
&& old.len() == new.len()
&& old.mode() == new.mode()
&& old.mtime() == new.mtime()
&& old.mtime_ns() == new.mtime_ns()
&& old.symlink_target() == new.symlink_target();
!unchanged
}
|
