mirror of https://github.com/dswd/zvault
405 lines
16 KiB
Rust
405 lines
16 KiB
Rust
use ::prelude::*;
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use std::fs;
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use std::path::{self, Path, PathBuf};
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use std::collections::{HashMap, BTreeMap, VecDeque};
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use std::os::linux::fs::MetadataExt;
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use chrono::prelude::*;
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use regex::RegexSet;
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use users::{self, Users, Groups};
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quick_error!{
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#[derive(Debug)]
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#[allow(unknown_lints,large_enum_variant)]
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pub enum BackupError {
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FailedPaths(backup: Backup, failed: Vec<PathBuf>) {
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description("Some paths could not be backed up")
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display("Backup error: some paths could not be backed up")
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}
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RemoveRoot {
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description("The root of a backup can not be removed")
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display("Backup error: the root of a backup can not be removed")
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}
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}
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}
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pub struct BackupOptions {
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pub same_device: bool,
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pub excludes: Option<RegexSet>
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}
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pub enum DiffType {
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Add, Mod, Del
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}
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impl Repository {
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pub fn get_backups(&self) -> Result<HashMap<String, Backup>, RepositoryError> {
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Ok(try!(Backup::get_all_from(&self.crypto.lock().unwrap(), self.layout.backups_path())))
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}
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#[inline]
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pub fn has_backup(&self, name: &str) -> bool {
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self.layout.backup_path(name).exists()
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}
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pub fn get_backup(&self, name: &str) -> Result<Backup, RepositoryError> {
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Ok(try!(Backup::read_from(&self.crypto.lock().unwrap(), self.layout.backup_path(name))))
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}
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pub fn save_backup(&mut self, backup: &Backup, name: &str) -> Result<(), RepositoryError> {
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try!(self.write_mode());
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let path = self.layout.backup_path(name);
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try!(fs::create_dir_all(path.parent().unwrap()));
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Ok(try!(backup.save_to(&self.crypto.lock().unwrap(), self.config.encryption.clone(), path)))
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}
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pub fn delete_backup(&mut self, name: &str) -> Result<(), RepositoryError> {
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try!(self.write_mode());
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let mut path = self.layout.backup_path(name);
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try!(fs::remove_file(&path));
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loop {
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path = path.parent().unwrap().to_owned();
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if path == self.layout.backups_path() || fs::remove_dir(&path).is_err() {
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break
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}
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}
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Ok(())
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}
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pub fn prune_backups(&mut self, prefix: &str, daily: usize, weekly: usize, monthly: usize, yearly: usize, force: bool) -> Result<(), RepositoryError> {
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try!(self.write_mode());
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let mut backups = Vec::new();
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let backup_map = match self.get_backups() {
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Ok(backup_map) => backup_map,
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Err(RepositoryError::BackupFile(BackupFileError::PartialBackupsList(backup_map, _failed))) => {
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warn!("Some backups could not be read, ignoring them");
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backup_map
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},
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Err(err) => return Err(err)
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};
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for (name, backup) in backup_map {
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if name.starts_with(prefix) {
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let date = Local.timestamp(backup.date, 0);
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backups.push((name, date, backup));
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}
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}
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backups.sort_by_key(|backup| -backup.2.date);
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let mut keep = Bitmap::new(backups.len());
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fn mark_needed<K: Eq, F: Fn(&DateTime<Local>) -> K>(backups: &[(String, DateTime<Local>, Backup)], keep: &mut Bitmap, max: usize, keyfn: F) {
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let mut kept = 0;
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let mut last = None;
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for (i, backup) in backups.iter().enumerate() {
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let val = keyfn(&backup.1);
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let cur = Some(val);
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if cur != last {
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if kept >= max {
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break
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}
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last = cur;
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keep.set(i);
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kept += 1;
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}
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}
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}
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if yearly > 0 {
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mark_needed(&backups, &mut keep, yearly, |d| d.year());
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}
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if monthly > 0 {
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mark_needed(&backups, &mut keep, monthly, |d| (d.year(), d.month()));
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}
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if weekly > 0 {
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mark_needed(&backups, &mut keep, weekly, |d| (d.isoweekdate().0, d.isoweekdate().1));
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}
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if daily > 0 {
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mark_needed(&backups, &mut keep, daily, |d| (d.year(), d.month(), d.day()));
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}
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let mut remove = Vec::new();
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println!("Removing the following backups");
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for (i, backup) in backups.into_iter().enumerate() {
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if !keep.get(i) {
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println!(" - {}", backup.0);
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remove.push(backup.0);
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}
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}
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if force {
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for name in remove {
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try!(self.delete_backup(&name));
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}
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}
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Ok(())
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}
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pub fn restore_inode_tree<P: AsRef<Path>>(&mut self, backup: &Backup, inode: Inode, path: P) -> Result<(), RepositoryError> {
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let _lock = try!(self.lock(false));
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let mut queue = VecDeque::new();
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queue.push_back((path.as_ref().to_owned(), inode));
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let cache = users::UsersCache::new();
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while let Some((path, mut inode)) = queue.pop_front() {
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if let Some(name) = backup.user_names.get(&inode.user) {
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if let Some(user) = cache.get_user_by_name(name) {
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inode.user = user.uid();
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}
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}
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if let Some(name) = backup.group_names.get(&inode.group) {
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if let Some(group) = cache.get_group_by_name(name) {
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inode.group = group.gid();
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}
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}
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try!(self.save_inode_at(&inode, &path));
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if inode.file_type == FileType::Directory {
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let path = path.join(inode.name);
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for chunks in inode.children.unwrap().values() {
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let inode = try!(self.get_inode(&chunks));
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queue.push_back((path.clone(), inode));
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}
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}
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}
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Ok(())
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}
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pub fn create_backup_recurse<P: AsRef<Path>>(
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&mut self,
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path: P,
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reference: Option<&Inode>,
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options: &BackupOptions,
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backup: &mut Backup,
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failed_paths: &mut Vec<PathBuf>
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) -> Result<Inode, RepositoryError> {
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let path = path.as_ref();
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let mut inode = try!(self.create_inode(path, reference));
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if !backup.user_names.contains_key(&inode.user) {
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if let Some(user) = users::get_user_by_uid(inode.user) {
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backup.user_names.insert(inode.user, user.name().to_string());
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} else {
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warn!("Failed to retrieve name of user {}", inode.user);
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}
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}
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if !backup.group_names.contains_key(&inode.group) {
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if let Some(group) = users::get_group_by_gid(inode.group) {
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backup.group_names.insert(inode.group, group.name().to_string());
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} else {
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warn!("Failed to retrieve name of group {}", inode.group);
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}
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}
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let mut meta_size = 0;
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inode.cum_size = inode.size;
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if inode.file_type == FileType::Directory {
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inode.cum_dirs = 1;
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let mut children = BTreeMap::new();
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let parent_dev = try!(path.metadata()).st_dev();
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for ch in try!(fs::read_dir(path)) {
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let child = try!(ch);
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let child_path = child.path();
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if options.same_device {
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let child_dev = try!(child.metadata()).st_dev();
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if child_dev != parent_dev {
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continue
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}
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}
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if let Some(ref excludes) = options.excludes {
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let child_path_str = child_path.to_string_lossy();
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if excludes.is_match(&child_path_str) {
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continue
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}
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}
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let name = child.file_name().to_string_lossy().to_string();
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let ref_child = reference.as_ref()
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.and_then(|inode| inode.children.as_ref())
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.and_then(|map| map.get(&name))
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.and_then(|chunks| self.get_inode(chunks).ok());
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let child_inode = match self.create_backup_recurse(&child_path, ref_child.as_ref(), options, backup, failed_paths) {
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Ok(inode) => inode,
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Err(RepositoryError::Inode(_)) | Err(RepositoryError::Chunker(_)) | Err(RepositoryError::Io(_)) => {
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info!("Failed to backup {:?}", child_path);
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failed_paths.push(child_path);
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continue
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},
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Err(err) => return Err(err)
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};
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let chunks = try!(self.put_inode(&child_inode));
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inode.cum_size += child_inode.cum_size;
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for &(_, len) in chunks.iter() {
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meta_size += len as u64;
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}
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inode.cum_dirs += child_inode.cum_dirs;
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inode.cum_files += child_inode.cum_files;
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children.insert(name, chunks);
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}
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inode.children = Some(children);
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} else {
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inode.cum_files = 1;
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if let Some(FileData::ChunkedIndirect(ref chunks)) = inode.data {
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for &(_, len) in chunks.iter() {
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meta_size += len as u64;
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}
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}
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}
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inode.cum_size += meta_size;
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if let Some(ref_inode) = reference {
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if !ref_inode.is_same_meta_quick(&inode) {
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backup.changed_data_size += inode.size + meta_size;
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}
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} else {
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backup.changed_data_size += inode.size + meta_size;
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}
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Ok(inode)
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}
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pub fn create_backup_recursively<P: AsRef<Path>>(&mut self, path: P, reference: Option<&Backup>, options: &BackupOptions) -> Result<Backup, RepositoryError> {
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try!(self.write_mode());
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let _lock = try!(self.lock(false));
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if self.dirty {
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return Err(RepositoryError::Dirty)
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}
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try!(self.set_dirty());
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let reference_inode = reference.and_then(|b| self.get_inode(&b.root).ok());
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let mut backup = Backup::default();
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backup.config = self.config.clone();
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backup.host = get_hostname().unwrap_or_else(|_| "".to_string());
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backup.path = path.as_ref().to_string_lossy().to_string();
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let info_before = self.info();
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let start = Local::now();
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let mut failed_paths = vec![];
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let root_inode = try!(self.create_backup_recurse(path, reference_inode.as_ref(), options, &mut backup, &mut failed_paths));
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backup.root = try!(self.put_inode(&root_inode));
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try!(self.flush());
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let elapsed = Local::now().signed_duration_since(start);
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backup.date = start.timestamp();
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backup.total_data_size = root_inode.cum_size;
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for &(_, len) in backup.root.iter() {
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backup.total_data_size += len as u64;
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}
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backup.file_count = root_inode.cum_files;
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backup.dir_count = root_inode.cum_dirs;
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backup.duration = elapsed.num_milliseconds() as f32 / 1_000.0;
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let info_after = self.info();
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backup.deduplicated_data_size = info_after.raw_data_size - info_before.raw_data_size;
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backup.encoded_data_size = info_after.encoded_data_size - info_before.encoded_data_size;
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backup.bundle_count = info_after.bundle_count - info_before.bundle_count;
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backup.chunk_count = info_after.chunk_count - info_before.chunk_count;
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backup.avg_chunk_size = backup.deduplicated_data_size as f32 / backup.chunk_count as f32;
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self.dirty = false;
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if failed_paths.is_empty() {
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Ok(backup)
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} else {
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Err(BackupError::FailedPaths(backup, failed_paths).into())
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}
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}
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pub fn remove_backup_path<P: AsRef<Path>>(&mut self, backup: &mut Backup, path: P) -> Result<(), RepositoryError> {
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try!(self.write_mode());
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let _lock = try!(self.lock(false));
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let mut inodes = try!(self.get_backup_path(backup, path));
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let to_remove = inodes.pop().unwrap();
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let mut remove_from = match inodes.pop() {
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Some(inode) => inode,
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None => return Err(BackupError::RemoveRoot.into())
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};
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remove_from.children.as_mut().unwrap().remove(&to_remove.name);
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let mut last_inode_chunks = try!(self.put_inode(&remove_from));
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let mut last_inode_name = remove_from.name;
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while let Some(mut inode) = inodes.pop() {
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inode.children.as_mut().unwrap().insert(last_inode_name, last_inode_chunks);
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last_inode_chunks = try!(self.put_inode(&inode));
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last_inode_name = inode.name;
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}
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backup.root = last_inode_chunks;
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backup.modified = true;
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Ok(())
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}
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pub fn get_backup_path<P: AsRef<Path>>(&mut self, backup: &Backup, path: P) -> Result<Vec<Inode>, RepositoryError> {
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let mut inodes = vec![];
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let mut inode = try!(self.get_inode(&backup.root));
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for c in path.as_ref().components() {
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if let path::Component::Normal(name) = c {
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let name = name.to_string_lossy();
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if let Some(chunks) = inode.children.as_mut().and_then(|c| c.remove(&name as &str)) {
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inodes.push(inode);
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inode = try!(self.get_inode(&chunks));
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} else {
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return Err(RepositoryError::NoSuchFileInBackup(backup.clone(), path.as_ref().to_owned()));
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}
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}
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}
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inodes.push(inode);
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Ok(inodes)
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}
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#[inline]
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pub fn get_backup_inode<P: AsRef<Path>>(&mut self, backup: &Backup, path: P) -> Result<Inode, RepositoryError> {
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self.get_backup_path(backup, path).map(|mut inodes| inodes.pop().unwrap())
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}
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pub fn find_versions<P: AsRef<Path>>(&mut self, path: P) -> Result<Vec<(String, Inode)>, RepositoryError> {
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let path = path.as_ref();
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let mut versions = HashMap::new();
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for (name, backup) in try!(self.get_backups()) {
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match self.get_backup_inode(&backup, path) {
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Ok(inode) => {
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versions.insert((inode.file_type, inode.timestamp, inode.size), (name, inode));
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},
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Err(RepositoryError::NoSuchFileInBackup(..)) => continue,
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Err(err) => return Err(err)
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}
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}
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let mut versions: Vec<_> = versions.into_iter().map(|(_, v)| v).collect();
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versions.sort_by_key(|v| v.1.timestamp);
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Ok(versions)
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}
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fn find_differences_recurse(&mut self, inode1: &Inode, inode2: &Inode, path: PathBuf, diffs: &mut Vec<(DiffType, PathBuf)>) -> Result<(), RepositoryError> {
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if !inode1.is_same_meta(inode2) || inode1.data != inode2.data {
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diffs.push((DiffType::Mod, path.clone()));
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}
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if let Some(ref children1) = inode1.children {
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if let Some(ref children2) = inode2.children {
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for name in children1.keys() {
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if !children2.contains_key(name) {
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diffs.push((DiffType::Del, path.join(name)));
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}
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}
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} else {
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for name in children1.keys() {
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diffs.push((DiffType::Del, path.join(name)));
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}
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}
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}
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if let Some(ref children2) = inode2.children {
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if let Some(ref children1) = inode1.children {
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for (name, chunks2) in children2 {
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if let Some(chunks1) = children1.get(name) {
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if chunks1 != chunks2 {
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let inode1 = try!(self.get_inode(chunks1));
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let inode2 = try!(self.get_inode(chunks2));
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try!(self.find_differences_recurse(&inode1, &inode2, path.join(name), diffs));
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}
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} else {
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diffs.push((DiffType::Add, path.join(name)));
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}
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}
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} else {
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for name in children2.keys() {
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diffs.push((DiffType::Add, path.join(name)));
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}
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}
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}
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Ok(())
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}
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#[inline]
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pub fn find_differences(&mut self, inode1: &Inode, inode2: &Inode) -> Result<Vec<(DiffType, PathBuf)>, RepositoryError> {
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let mut diffs = vec![];
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let path = PathBuf::from("/");
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try!(self.find_differences_recurse(inode1, inode2, path, &mut diffs));
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Ok(diffs)
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}
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}
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