Implemented exporting xattrs in tar files (re #1)

pull/10/head
Dennis Schwerdel 6 years ago
parent 5ab8873407
commit 72ed1fae6e
  1. 33
      src/repository/tarfile.rs

@ -4,12 +4,15 @@ use std::collections::{HashMap, HashSet, BTreeMap};
use std::path::{Path, PathBuf};
use std::io::{Read, Cursor};
use std::fs::File;
use std::str;
use chrono::prelude::*;
use tar;
static PAX_XATTR_PREFIX: &'static str = "SCHILY.xattr.";
fn inode_from_entry<R: Read>(entry: &mut tar::Entry<R>) -> Result<Inode, RepositoryError> {
let mut inode = {
let path = try!(entry.path());
@ -36,8 +39,8 @@ fn inode_from_entry<R: Read>(entry: &mut tar::Entry<R>) -> Result<Inode, Reposit
for ext in exts {
let ext = try!(ext);
let key = ext.key().unwrap_or("");
if key.starts_with("SCHILY.xattr.") {
inode.xattrs.insert(key[13..].to_string(), ext.value_bytes().to_vec().into());
if key.starts_with(PAX_XATTR_PREFIX) {
inode.xattrs.insert(key[PAX_XATTR_PREFIX.len()..].to_string(), ext.value_bytes().to_vec().into());
}
}
}
@ -205,7 +208,33 @@ impl Repository {
}
}
fn export_xattrs(&mut self, inode: &Inode, tarfile: &mut tar::Builder<File>) -> Result<(), RepositoryError> {
let mut data = Vec::new();
for (key, value) in &inode.xattrs {
let mut len_len = 1;
let mut max_len = 10;
let rest_len = 3 + key.len() + value.len() + PAX_XATTR_PREFIX.len();
while rest_len + len_len >= max_len {
len_len += 1;
max_len *= 10;
}
let len = rest_len + len_len;
let value = str::from_utf8(value).unwrap();
let line = format!("{} {}{}={}\n", len, PAX_XATTR_PREFIX, key, value);
assert_eq!(line.len(), len);
data.extend_from_slice(line.as_bytes());
}
let mut header = tar::Header::new_ustar();
header.set_size(data.len() as u64);
header.set_entry_type(tar::EntryType::XHeader);
header.set_cksum();
Ok(try!(tarfile.append(&header, Cursor::new(&data))))
}
fn export_tarfile_recurse(&mut self, backup: &Backup, path: &Path, inode: Inode, tarfile: &mut tar::Builder<File>) -> Result<(), RepositoryError> {
if !inode.xattrs.is_empty() {
try!(self.export_xattrs(&inode, tarfile));
}
let mut header = tar::Header::new_gnu();
header.set_size(inode.size);
let path = path.join(inode.name);

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