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use std::path::{Path, PathBuf};
/// A file system entry.
///
/// Represent all backup-relevant the metadata about a file system
/// object: fully qualified pathname, type, length (if applicable),
/// etc. Everything except the content of a regular file or the
/// contents of a directory.
///
/// This is everything Obnam cares about each file system object, when
/// making a backup.
#[derive(Debug)]
pub struct FilesystemEntry {
kind: FilesystemKind,
path: PathBuf,
len: u64,
}
#[allow(clippy::len_without_is_empty)]
impl FilesystemEntry {
fn new(kind: FilesystemKind, path: &Path, len: u64) -> Self {
Self {
path: path.to_path_buf(),
kind,
len,
}
}
pub fn regular<P>(path: P, len: u64) -> Self
where
P: AsRef<Path>,
{
Self::new(FilesystemKind::Regular, path.as_ref(), len)
}
pub fn directory<P>(path: P) -> Self
where
P: AsRef<Path>,
{
Self::new(FilesystemKind::Directory, path.as_ref(), 0)
}
pub fn kind(&self) -> FilesystemKind {
self.kind
}
pub fn path(&self) -> &Path {
&self.path
}
pub fn len(&self) -> u64 {
self.len
}
}
/// Different types of file system entries.
#[derive(Debug, Copy, Clone, PartialEq)]
pub enum FilesystemKind {
Regular,
Directory,
}
impl FilesystemKind {
pub fn as_code(&self) -> u8 {
match self {
FilesystemKind::Regular => 0,
FilesystemKind::Directory => 1,
}
}
pub fn from_code(code: u8) -> anyhow::Result<Self> {
match code {
0 => Ok(FilesystemKind::Regular),
1 => Ok(FilesystemKind::Directory),
_ => Err(Error::UnknownFileKindCode(code).into()),
}
}
}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("unknown file kind code {0}")]
UnknownFileKindCode(u8),
}
#[cfg(test)]
mod test {
use super::{FilesystemEntry, FilesystemKind};
use std::path::Path;
#[test]
fn regular_file() {
let filename = Path::new("foo.dat");
let len = 123;
let e = FilesystemEntry::regular(filename, len);
assert_eq!(e.kind(), FilesystemKind::Regular);
assert_eq!(e.path(), filename);
assert_eq!(e.len(), len);
}
#[test]
fn directory() {
let filename = Path::new("foo.dat");
let e = FilesystemEntry::directory(filename);
assert_eq!(e.kind(), FilesystemKind::Directory);
assert_eq!(e.path(), filename);
assert_eq!(e.len(), 0);
}
#[test]
fn file_kind_regular_round_trips() {
one_file_kind_round_trip(FilesystemKind::Regular);
one_file_kind_round_trip(FilesystemKind::Directory);
}
fn one_file_kind_round_trip(kind: FilesystemKind) {
assert_eq!(kind, FilesystemKind::from_code(kind.as_code()).unwrap());
}
}
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