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src/pxar/encoder.rs: detect hardlinks

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This commit is contained in:
Dietmar Maurer 2019-03-15 12:19:51 +01:00
parent 896e803feb
commit 812dd935ce
1 changed files with 57 additions and 30 deletions
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87
src/pxar/encoder.rs
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@ -4,6 +4,7 @@
use failure::*;
use endian_trait::Endian;
use std::collections::HashMap;
use super::format_definition::*;
use super::binary_search_tree::*;
@ -27,8 +28,15 @@ use nix::sys::stat::FileStat;
/// maximum memory usage.
pub const MAX_DIRECTORY_ENTRIES: usize = 256*1024;
#[derive(Eq, PartialEq, Hash)]
struct HardLinkInfo {
st_dev: u64,
st_ino: u64,
}
pub struct Encoder<'a, W: Write> {
current_path: PathBuf, // used for error reporting
base_path: PathBuf,
relative_path: PathBuf,
writer: &'a mut W,
writer_pos: usize,
_size: usize,
@ -36,10 +44,16 @@ pub struct Encoder<'a, W: Write> {
all_file_systems: bool,
root_st_dev: u64,
verbose: bool,
hardlinks: HashMap<HardLinkInfo, PathBuf>,
}
impl <'a, W: Write> Encoder<'a, W> {
// used for error reporting
fn full_path(&self) -> PathBuf {
self.base_path.join(&self.relative_path)
}
pub fn encode(
path: PathBuf,
dir: &mut nix::dir::Dir,
@ -73,7 +87,8 @@ impl <'a, W: Write> Encoder<'a, W> {
}
let mut me = Self {
current_path: path,
base_path: path,
relative_path: PathBuf::new(),
writer: writer,
writer_pos: 0,
_size: 0,
@ -81,9 +96,10 @@ impl <'a, W: Write> Encoder<'a, W> {
all_file_systems,
root_st_dev: stat.st_dev,
verbose,
hardlinks: HashMap::new(),
};
if verbose { println!("{:?}", me.current_path); }
if verbose { println!("{:?}", me.full_path()); }
me.encode_dir(dir, &stat, magic)?;
@ -143,7 +159,7 @@ impl <'a, W: Write> Encoder<'a, W> {
let mtime = stat.st_mtime * 1_000_000_000 + stat.st_mtime_nsec;
if mtime < 0 {
bail!("got strange mtime ({}) from fstat for {:?}.", mtime, self.current_path);
bail!("got strange mtime ({}) from fstat for {:?}.", mtime, self.full_path());
}
@ -168,7 +184,7 @@ impl <'a, W: Write> Encoder<'a, W> {
if let nix::Error::Sys(errno) = err {
if errno_is_unsupported(errno) { return Ok(()) };
}
bail!("read_attr_fd failed for {:?} - {}", self.current_path, err);
bail!("read_attr_fd failed for {:?} - {}", self.full_path(), err);
}
let flags = ca_feature_flags_from_chattr(attr as u32);
@ -188,7 +204,7 @@ impl <'a, W: Write> Encoder<'a, W> {
if let nix::Error::Sys(errno) = err {
if errno_is_unsupported(errno) { return Ok(()) };
}
bail!("read_fat_attr_fd failed for {:?} - {}", self.current_path, err);
bail!("read_fat_attr_fd failed for {:?} - {}", self.full_path(), err);
}
let flags = ca_feature_flags_from_fat_attr(attr);
@ -246,7 +262,7 @@ impl <'a, W: Write> Encoder<'a, W> {
fn encode_dir(&mut self, dir: &mut nix::dir::Dir, dir_stat: &FileStat, magic: i64) -> Result<(), Error> {
//println!("encode_dir: {:?} start {}", self.current_path, self.writer_pos);
//println!("encode_dir: {:?} start {}", self.full_path(), self.writer_pos);
let mut name_list = vec![];
@ -275,12 +291,12 @@ impl <'a, W: Write> Encoder<'a, W> {
dir_count += 1;
if dir_count > MAX_DIRECTORY_ENTRIES {
bail!("too many directory items in {:?} (> {})",
self.current_path, MAX_DIRECTORY_ENTRIES);
self.full_path(), MAX_DIRECTORY_ENTRIES);
}
let entry = match entry {
Ok(entry) => entry,
Err(err) => bail!("readir {:?} failed - {}", self.current_path, err),
Err(err) => bail!("readir {:?} failed - {}", self.full_path(), err),
};
let filename = entry.file_name().to_owned();
@ -292,7 +308,7 @@ impl <'a, W: Write> Encoder<'a, W> {
name_list.push(filename);
}
} else {
eprintln!("skip mount point: {:?}", self.current_path);
eprintln!("skip mount point: {:?}", self.full_path());
}
name_list.sort_unstable_by(|a, b| a.cmp(&b));
@ -300,17 +316,17 @@ impl <'a, W: Write> Encoder<'a, W> {
let mut goodbye_items = vec![];
for filename in &name_list {
self.current_path.push(std::ffi::OsStr::from_bytes(filename.as_bytes()));
self.relative_path.push(std::ffi::OsStr::from_bytes(filename.as_bytes()));
if self.verbose { println!("{:?}", self.current_path); }
if self.verbose { println!("{:?}", self.full_path()); }
let stat = match nix::sys::stat::fstatat(rawfd, filename.as_ref(), nix::fcntl::AtFlags::AT_SYMLINK_NOFOLLOW) {
Ok(stat) => stat,
Err(nix::Error::Sys(Errno::ENOENT)) => {
self.report_vanished_file(&self.current_path)?;
self.report_vanished_file(&self.full_path())?;
continue;
}
Err(err) => bail!("fstat {:?} failed - {}", self.current_path, err),
Err(err) => bail!("fstat {:?} failed - {}", self.full_path(), err),
};
let start_pos = self.writer_pos;
@ -322,10 +338,10 @@ impl <'a, W: Write> Encoder<'a, W> {
let mut dir = match nix::dir::Dir::openat(rawfd, filename.as_ref(), OFlag::O_DIRECTORY|OFlag::O_NOFOLLOW, Mode::empty()) {
Ok(dir) => dir,
Err(nix::Error::Sys(Errno::ENOENT)) => {
self.report_vanished_file(&self.current_path)?;
self.report_vanished_file(&self.full_path())?;
continue; // fixme!!
},
Err(err) => bail!("open dir {:?} failed - {}", self.current_path, err),
Err(err) => bail!("open dir {:?} failed - {}", self.full_path(), err),
};
let child_magic = if dir_stat.st_dev != stat.st_dev {
@ -338,13 +354,24 @@ impl <'a, W: Write> Encoder<'a, W> {
self.encode_dir(&mut dir, &stat, child_magic)?;
} else if ifmt == libc::S_IFREG {
if stat.st_nlink > 1 {
let link_info = HardLinkInfo { st_dev: stat.st_dev, st_ino: stat.st_ino };
if let Some(target) = self.hardlinks.get(&link_info) {
// fixme: store hardlink info somwhow?
eprintln!("FOUND HARDLINK {:?}", target);
} else {
self.hardlinks.insert(link_info, self.relative_path.clone());
}
}
let filefd = match nix::fcntl::openat(rawfd, filename.as_ref(), OFlag::O_NOFOLLOW, Mode::empty()) {
Ok(filefd) => filefd,
Err(nix::Error::Sys(Errno::ENOENT)) => {
self.report_vanished_file(&self.current_path)?;
self.report_vanished_file(&self.full_path())?;
continue;
},
Err(err) => bail!("open file {:?} failed - {}", self.current_path, err),
Err(err) => bail!("open file {:?} failed - {}", self.full_path(), err),
};
let child_magic = if dir_stat.st_dev != stat.st_dev {
@ -372,10 +399,10 @@ impl <'a, W: Write> Encoder<'a, W> {
self.encode_symlink(&buffer[..((len+1) as usize)], &stat)?
}
Err(nix::Error::Sys(Errno::ENOENT)) => {
self.report_vanished_file(&self.current_path)?;
self.report_vanished_file(&self.full_path())?;
continue;
}
Err(err) => bail!("readlink {:?} failed - {}", self.current_path, err),
Err(err) => bail!("readlink {:?} failed - {}", self.full_path(), err),
}
} else if (ifmt == libc::S_IFBLK) || (ifmt == libc::S_IFCHR) {
self.write_filename(&filename)?;
@ -384,7 +411,7 @@ impl <'a, W: Write> Encoder<'a, W> {
self.write_filename(&filename)?;
self.encode_special(&stat)?;
} else {
bail!("unsupported file type (mode {:o} {:?})", stat.st_mode, self.current_path);
bail!("unsupported file type (mode {:o} {:?})", stat.st_mode, self.full_path());
}
let end_pos = self.writer_pos;
@ -395,10 +422,10 @@ impl <'a, W: Write> Encoder<'a, W> {
hash: compute_goodbye_hash(filename.to_bytes()),
});
self.current_path.pop();
self.relative_path.pop();
}
//println!("encode_dir: {:?} end {}", self.current_path, self.writer_pos);
//println!("encode_dir: {:?} end {}", self.full_path(), self.writer_pos);
// fixup goodby item offsets
let goodbye_start = self.writer_pos as u64;
@ -410,13 +437,13 @@ impl <'a, W: Write> Encoder<'a, W> {
self.write_goodbye_table(goodbye_offset, &mut goodbye_items)?;
//println!("encode_dir: {:?} end1 {}", self.current_path, self.writer_pos);
//println!("encode_dir: {:?} end1 {}", self.full_path(), self.writer_pos);
Ok(())
}
fn encode_file(&mut self, filefd: RawFd, stat: &FileStat, magic: i64) -> Result<(), Error> {
//println!("encode_file: {:?}", self.current_path);
//println!("encode_file: {:?}", self.full_path());
let mut entry = self.create_entry(&stat)?;
@ -433,7 +460,7 @@ impl <'a, W: Write> Encoder<'a, W> {
}
if !include_payload {
eprintln!("skip content: {:?}", self.current_path);
eprintln!("skip content: {:?}", self.full_path());
self.write_header(CA_FORMAT_PAYLOAD, 0)?;
return Ok(());
}
@ -447,12 +474,12 @@ impl <'a, W: Write> Encoder<'a, W> {
let n = match nix::unistd::read(filefd, &mut self.file_copy_buffer) {
Ok(n) => n,
Err(nix::Error::Sys(Errno::EINTR)) => continue /* try again */,
Err(err) => bail!("read {:?} failed - {}", self.current_path, err),
Err(err) => bail!("read {:?} failed - {}", self.full_path(), err),
};
if n == 0 { // EOF
if pos != size {
// Note:: casync format cannot handle that
bail!("detected shrinked file {:?} ({} < {})", self.current_path, pos, size);
bail!("detected shrinked file {:?} ({} < {})", self.full_path(), pos, size);
}
break;
}
@ -482,7 +509,7 @@ impl <'a, W: Write> Encoder<'a, W> {
let major = unsafe { libc::major(stat.st_rdev) } as u64;
let minor = unsafe { libc::minor(stat.st_rdev) } as u64;
//println!("encode_device: {:?} {} {} {}", self.current_path, stat.st_rdev, major, minor);
//println!("encode_device: {:?} {} {} {}", self.full_path(), stat.st_rdev, major, minor);
self.write_header(CA_FORMAT_DEVICE, std::mem::size_of::<CaFormatDevice>() as u64)?;
self.write_item(CaFormatDevice { major, minor })?;
@ -502,7 +529,7 @@ impl <'a, W: Write> Encoder<'a, W> {
fn encode_symlink(&mut self, target: &[u8], stat: &FileStat) -> Result<(), Error> {
//println!("encode_symlink: {:?} -> {:?}", self.current_path, target);
//println!("encode_symlink: {:?} -> {:?}", self.full_path(), target);
let entry = self.create_entry(&stat)?;
self.write_entry(entry)?;