proxmox-backup/src/backup/backup_info.rs

421 lines
12 KiB
Rust

use crate::tools;
use anyhow::{bail, format_err, Error};
use std::os::unix::io::RawFd;
use std::path::{Path, PathBuf};
use proxmox::const_regex;
use super::manifest::MANIFEST_BLOB_NAME;
macro_rules! BACKUP_ID_RE {
() => {
r"[A-Za-z0-9_][A-Za-z0-9._\-]*"
};
}
macro_rules! BACKUP_TYPE_RE {
() => {
r"(?:host|vm|ct)"
};
}
macro_rules! BACKUP_TIME_RE {
() => {
r"[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}Z"
};
}
const_regex! {
BACKUP_FILE_REGEX = r"^.*\.([fd]idx|blob)$";
BACKUP_TYPE_REGEX = concat!(r"^(", BACKUP_TYPE_RE!(), r")$");
pub BACKUP_ID_REGEX = concat!(r"^", BACKUP_ID_RE!(), r"$");
BACKUP_DATE_REGEX = concat!(r"^", BACKUP_TIME_RE!() ,r"$");
GROUP_PATH_REGEX = concat!(r"^(", BACKUP_TYPE_RE!(), ")/(", BACKUP_ID_RE!(), r")$");
SNAPSHOT_PATH_REGEX = concat!(
r"^(", BACKUP_TYPE_RE!(), ")/(", BACKUP_ID_RE!(), ")/(", BACKUP_TIME_RE!(), r")$");
}
/// BackupGroup is a directory containing a list of BackupDir
#[derive(Debug, Eq, PartialEq, Hash, Clone)]
pub struct BackupGroup {
/// Type of backup
backup_type: String,
/// Unique (for this type) ID
backup_id: String,
}
impl std::cmp::Ord for BackupGroup {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
let type_order = self.backup_type.cmp(&other.backup_type);
if type_order != std::cmp::Ordering::Equal {
return type_order;
}
// try to compare IDs numerically
let id_self = self.backup_id.parse::<u64>();
let id_other = other.backup_id.parse::<u64>();
match (id_self, id_other) {
(Ok(id_self), Ok(id_other)) => id_self.cmp(&id_other),
(Ok(_), Err(_)) => std::cmp::Ordering::Less,
(Err(_), Ok(_)) => std::cmp::Ordering::Greater,
_ => self.backup_id.cmp(&other.backup_id),
}
}
}
impl std::cmp::PartialOrd for BackupGroup {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl BackupGroup {
pub fn new<T: Into<String>, U: Into<String>>(backup_type: T, backup_id: U) -> Self {
Self {
backup_type: backup_type.into(),
backup_id: backup_id.into(),
}
}
pub fn backup_type(&self) -> &str {
&self.backup_type
}
pub fn backup_id(&self) -> &str {
&self.backup_id
}
pub fn group_path(&self) -> PathBuf {
let mut relative_path = PathBuf::new();
relative_path.push(&self.backup_type);
relative_path.push(&self.backup_id);
relative_path
}
pub fn list_backups(&self, base_path: &Path) -> Result<Vec<BackupInfo>, Error> {
let mut list = vec![];
let mut path = base_path.to_owned();
path.push(self.group_path());
tools::scandir(
libc::AT_FDCWD,
&path,
&BACKUP_DATE_REGEX,
|l2_fd, backup_time, file_type| {
if file_type != nix::dir::Type::Directory {
return Ok(());
}
let backup_dir =
BackupDir::with_rfc3339(&self.backup_type, &self.backup_id, backup_time)?;
let files = list_backup_files(l2_fd, backup_time)?;
list.push(BackupInfo { backup_dir, files });
Ok(())
},
)?;
Ok(list)
}
pub fn last_successful_backup(&self, base_path: &Path) -> Result<Option<i64>, Error> {
let mut last = None;
let mut path = base_path.to_owned();
path.push(self.group_path());
tools::scandir(
libc::AT_FDCWD,
&path,
&BACKUP_DATE_REGEX,
|l2_fd, backup_time, file_type| {
if file_type != nix::dir::Type::Directory {
return Ok(());
}
let mut manifest_path = PathBuf::from(backup_time);
manifest_path.push(MANIFEST_BLOB_NAME);
use nix::fcntl::{openat, OFlag};
match openat(
l2_fd,
&manifest_path,
OFlag::O_RDONLY,
nix::sys::stat::Mode::empty(),
) {
Ok(rawfd) => {
/* manifest exists --> assume backup was successful */
/* close else this leaks! */
nix::unistd::close(rawfd)?;
}
Err(nix::Error::Sys(nix::errno::Errno::ENOENT)) => {
return Ok(());
}
Err(err) => {
bail!("last_successful_backup: unexpected error - {}", err);
}
}
let timestamp = proxmox::tools::time::parse_rfc3339(backup_time)?;
if let Some(last_timestamp) = last {
if timestamp > last_timestamp {
last = Some(timestamp);
}
} else {
last = Some(timestamp);
}
Ok(())
},
)?;
Ok(last)
}
}
impl std::fmt::Display for BackupGroup {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let backup_type = self.backup_type();
let id = self.backup_id();
write!(f, "{}/{}", backup_type, id)
}
}
impl std::str::FromStr for BackupGroup {
type Err = Error;
/// Parse a backup group path
///
/// This parses strings like `vm/100".
fn from_str(path: &str) -> Result<Self, Self::Err> {
let cap = GROUP_PATH_REGEX
.captures(path)
.ok_or_else(|| format_err!("unable to parse backup group path '{}'", path))?;
Ok(Self {
backup_type: cap.get(1).unwrap().as_str().to_owned(),
backup_id: cap.get(2).unwrap().as_str().to_owned(),
})
}
}
/// Uniquely identify a Backup (relative to data store)
///
/// We also call this a backup snaphost.
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct BackupDir {
/// Backup group
group: BackupGroup,
/// Backup timestamp
backup_time: i64,
// backup_time as rfc3339
backup_time_string: String,
}
impl BackupDir {
pub fn new<T, U>(backup_type: T, backup_id: U, backup_time: i64) -> Result<Self, Error>
where
T: Into<String>,
U: Into<String>,
{
let group = BackupGroup::new(backup_type.into(), backup_id.into());
BackupDir::with_group(group, backup_time)
}
pub fn with_rfc3339<T, U, V>(
backup_type: T,
backup_id: U,
backup_time_string: V,
) -> Result<Self, Error>
where
T: Into<String>,
U: Into<String>,
V: Into<String>,
{
let backup_time_string = backup_time_string.into();
let backup_time = proxmox::tools::time::parse_rfc3339(&backup_time_string)?;
let group = BackupGroup::new(backup_type.into(), backup_id.into());
Ok(Self {
group,
backup_time,
backup_time_string,
})
}
pub fn with_group(group: BackupGroup, backup_time: i64) -> Result<Self, Error> {
let backup_time_string = Self::backup_time_to_string(backup_time)?;
Ok(Self {
group,
backup_time,
backup_time_string,
})
}
pub fn group(&self) -> &BackupGroup {
&self.group
}
pub fn backup_time(&self) -> i64 {
self.backup_time
}
pub fn backup_time_string(&self) -> &str {
&self.backup_time_string
}
pub fn relative_path(&self) -> PathBuf {
let mut relative_path = self.group.group_path();
relative_path.push(self.backup_time_string.clone());
relative_path
}
pub fn backup_time_to_string(backup_time: i64) -> Result<String, Error> {
// fixme: can this fail? (avoid unwrap)
proxmox::tools::time::epoch_to_rfc3339_utc(backup_time)
}
}
impl std::str::FromStr for BackupDir {
type Err = Error;
/// Parse a snapshot path
///
/// This parses strings like `host/elsa/2020-06-15T05:18:33Z".
fn from_str(path: &str) -> Result<Self, Self::Err> {
let cap = SNAPSHOT_PATH_REGEX
.captures(path)
.ok_or_else(|| format_err!("unable to parse backup snapshot path '{}'", path))?;
BackupDir::with_rfc3339(
cap.get(1).unwrap().as_str(),
cap.get(2).unwrap().as_str(),
cap.get(3).unwrap().as_str(),
)
}
}
impl std::fmt::Display for BackupDir {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let backup_type = self.group.backup_type();
let id = self.group.backup_id();
write!(f, "{}/{}/{}", backup_type, id, self.backup_time_string)
}
}
/// Detailed Backup Information, lists files inside a BackupDir
#[derive(Debug, Clone)]
pub struct BackupInfo {
/// the backup directory
pub backup_dir: BackupDir,
/// List of data files
pub files: Vec<String>,
}
impl BackupInfo {
pub fn new(base_path: &Path, backup_dir: BackupDir) -> Result<BackupInfo, Error> {
let mut path = base_path.to_owned();
path.push(backup_dir.relative_path());
let files = list_backup_files(libc::AT_FDCWD, &path)?;
Ok(BackupInfo { backup_dir, files })
}
/// Finds the latest backup inside a backup group
pub fn last_backup(
base_path: &Path,
group: &BackupGroup,
only_finished: bool,
) -> Result<Option<BackupInfo>, Error> {
let backups = group.list_backups(base_path)?;
Ok(backups
.into_iter()
.filter(|item| !only_finished || item.is_finished())
.max_by_key(|item| item.backup_dir.backup_time()))
}
pub fn sort_list(list: &mut Vec<BackupInfo>, ascendending: bool) {
if ascendending {
// oldest first
list.sort_unstable_by(|a, b| a.backup_dir.backup_time.cmp(&b.backup_dir.backup_time));
} else {
// newest first
list.sort_unstable_by(|a, b| b.backup_dir.backup_time.cmp(&a.backup_dir.backup_time));
}
}
pub fn list_files(base_path: &Path, backup_dir: &BackupDir) -> Result<Vec<String>, Error> {
let mut path = base_path.to_owned();
path.push(backup_dir.relative_path());
let files = list_backup_files(libc::AT_FDCWD, &path)?;
Ok(files)
}
pub fn list_backup_groups(base_path: &Path) -> Result<Vec<BackupGroup>, Error> {
let mut list = Vec::new();
tools::scandir(
libc::AT_FDCWD,
base_path,
&BACKUP_TYPE_REGEX,
|l0_fd, backup_type, file_type| {
if file_type != nix::dir::Type::Directory {
return Ok(());
}
tools::scandir(
l0_fd,
backup_type,
&BACKUP_ID_REGEX,
|_, backup_id, file_type| {
if file_type != nix::dir::Type::Directory {
return Ok(());
}
list.push(BackupGroup::new(backup_type, backup_id));
Ok(())
},
)
},
)?;
Ok(list)
}
pub fn is_finished(&self) -> bool {
// backup is considered unfinished if there is no manifest
self.files
.iter()
.any(|name| name == super::MANIFEST_BLOB_NAME)
}
}
fn list_backup_files<P: ?Sized + nix::NixPath>(
dirfd: RawFd,
path: &P,
) -> Result<Vec<String>, Error> {
let mut files = vec![];
tools::scandir(dirfd, path, &BACKUP_FILE_REGEX, |_, filename, file_type| {
if file_type != nix::dir::Type::File {
return Ok(());
}
files.push(filename.to_owned());
Ok(())
})?;
Ok(files)
}