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use crate::backup_reason::Reason;
use crate::fsentry::FilesystemEntry;
use crate::generation::LocalGeneration;
use log::{debug, warn};
pub struct BackupPolicy {
new: bool,
old_if_changed: bool,
}
impl BackupPolicy {
pub fn new() -> Self {
Self {
new: true,
old_if_changed: true,
}
}
pub fn needs_backup(&self, old: &LocalGeneration, new_entry: &FilesystemEntry) -> Reason {
let new_name = new_entry.pathbuf();
let reason = 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
}
};
debug!(
"needs_backup: file {:?}: policy decision: {}",
new_name, reason
);
reason
}
}
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
}
|
