Struct tar::Builder

pub struct Builder<W: Write> { /* private fields */ }

A structure for building archives

This structure has methods for building up an archive from scratch into any arbitrary writer.

Implementations

impl<W: Write> Builder<W>

pub fn new(obj: W) -> Builder<W>

Create a new archive builder with the underlying object as the destination of all data written. The builder will use HeaderMode::Complete by default.

pub fn mode(&mut self, mode: HeaderMode)

Changes the HeaderMode that will be used when reading fs Metadata for methods that implicitly read metadata for an input Path. Notably, this does not apply to append(Header).

pub fn follow_symlinks(&mut self, follow: bool)

Follow symlinks, archiving the contents of the file they point to rather than adding a symlink to the archive. Defaults to true.

pub fn get_ref(&self) -> &W

Gets shared reference to the underlying object.

pub fn get_mut(&mut self) -> &mut W

Gets mutable reference to the underlying object.

Note that care must be taken while writing to the underlying object. But, e.g. get_mut().flush() is claimed to be safe and useful in the situations when one needs to be ensured that tar entry was flushed to the disk.

pub fn into_inner(self) -> Result<W>

Unwrap this archive, returning the underlying object.

This function will finish writing the archive if the finish function hasn’t yet been called, returning any I/O error which happens during that operation.

pub fn append<R: Read>(&mut self, header: &Header, data: R) -> Result<()>

Adds a new entry to this archive.

This function will append the header specified, followed by contents of the stream specified by data. To produce a valid archive the size field of header must be the same as the length of the stream that’s being written. Additionally the checksum for the header should have been set via the set_cksum method.

Note that this will not attempt to seek the archive to a valid position, so if the archive is in the middle of a read or some other similar operation then this may corrupt the archive.

Also note that after all entries have been written to an archive the finish function needs to be called to finish writing the archive.

Errors

This function will return an error for any intermittent I/O error which occurs when either reading or writing.

Examples

use tar::{Builder, Header};

let mut header = Header::new_gnu();
header.set_path("foo").unwrap();
header.set_size(4);
header.set_cksum();

let mut data: &[u8] = &[1, 2, 3, 4];

let mut ar = Builder::new(Vec::new());
ar.append(&header, data).unwrap();
let data = ar.into_inner().unwrap();

pub fn append_data<P: AsRef<Path>, R: Read>( &mut self, header: &mut Header, path: P, data: R, ) -> Result<()>

Adds a new entry to this archive with the specified path.

This function will set the specified path in the given header, which may require appending a GNU long-name extension entry to the archive first. The checksum for the header will be automatically updated via the set_cksum method after setting the path. No other metadata in the header will be modified.

Then it will append the header, followed by contents of the stream specified by data. To produce a valid archive the size field of header must be the same as the length of the stream that’s being written.

Note that this will not attempt to seek the archive to a valid position, so if the archive is in the middle of a read or some other similar operation then this may corrupt the archive.

Also note that after all entries have been written to an archive the finish function needs to be called to finish writing the archive.

Errors

This function will return an error for any intermittent I/O error which occurs when either reading or writing.

Examples

use tar::{Builder, Header};

let mut header = Header::new_gnu();
header.set_size(4);
header.set_cksum();

let mut data: &[u8] = &[1, 2, 3, 4];

let mut ar = Builder::new(Vec::new());
ar.append_data(&mut header, "really/long/path/to/foo", data).unwrap();
let data = ar.into_inner().unwrap();

pub fn append_link<P: AsRef<Path>, T: AsRef<Path>>( &mut self, header: &mut Header, path: P, target: T, ) -> Result<()>

Adds a new link (symbolic or hard) entry to this archive with the specified path and target.

This function is similar to Self::append_data which supports long filenames, but also supports long link targets using GNU extensions if necessary. You must set the entry type to either EntryType::Link or EntryType::Symlink. The set_cksum method will be invoked after setting the path. No other metadata in the header will be modified.

If you are intending to use GNU extensions, you must use this method over calling Header::set_link_name because that function will fail on long links.

Similar constraints around the position of the archive and completion apply as with Self::append_data.

Errors

This function will return an error for any intermittent I/O error which occurs when either reading or writing.

Examples

use tar::{Builder, Header, EntryType};

let mut ar = Builder::new(Vec::new());
let mut header = Header::new_gnu();
header.set_username("foo");
header.set_entry_type(EntryType::Symlink);
header.set_size(0);
ar.append_link(&mut header, "really/long/path/to/foo", "other/really/long/target").unwrap();
let data = ar.into_inner().unwrap();

pub fn append_path<P: AsRef<Path>>(&mut self, path: P) -> Result<()>

Adds a file on the local filesystem to this archive.

This function will open the file specified by path and insert the file into the archive with the appropriate metadata set, returning any I/O error which occurs while writing. The path name for the file inside of this archive will be the same as path, and it is required that the path is a relative path.

Note that this will not attempt to seek the archive to a valid position, so if the archive is in the middle of a read or some other similar operation then this may corrupt the archive.

Also note that after all files have been written to an archive the finish function needs to be called to finish writing the archive.

Examples

use tar::Builder;

let mut ar = Builder::new(Vec::new());

ar.append_path("foo/bar.txt").unwrap();

pub fn append_path_with_name<P: AsRef<Path>, N: AsRef<Path>>( &mut self, path: P, name: N, ) -> Result<()>

Adds a file on the local filesystem to this archive under another name.

This function will open the file specified by path and insert the file into the archive as name with appropriate metadata set, returning any I/O error which occurs while writing. The path name for the file inside of this archive will be name is required to be a relative path.

Note that this will not attempt to seek the archive to a valid position, so if the archive is in the middle of a read or some other similar operation then this may corrupt the archive.

Note if the path is a directory. This will just add an entry to the archive, rather than contents of the directory.

Also note that after all files have been written to an archive the finish function needs to be called to finish writing the archive.

Examples

use tar::Builder;

let mut ar = Builder::new(Vec::new());

// Insert the local file "foo/bar.txt" in the archive but with the name
// "bar/foo.txt".
ar.append_path_with_name("foo/bar.txt", "bar/foo.txt").unwrap();

pub fn append_file<P: AsRef<Path>>( &mut self, path: P, file: &mut File, ) -> Result<()>

Adds a file to this archive with the given path as the name of the file in the archive.

This will use the metadata of file to populate a Header, and it will then append the file to the archive with the name path.

Note that this will not attempt to seek the archive to a valid position, so if the archive is in the middle of a read or some other similar operation then this may corrupt the archive.

Also note that after all files have been written to an archive the finish function needs to be called to finish writing the archive.

Examples

use std::fs::File;
use tar::Builder;

let mut ar = Builder::new(Vec::new());

// Open the file at one location, but insert it into the archive with a
// different name.
let mut f = File::open("foo/bar/baz.txt").unwrap();
ar.append_file("bar/baz.txt", &mut f).unwrap();

pub fn append_dir<P, Q>(&mut self, path: P, src_path: Q) -> Result<()>

where P: AsRef<Path>, Q: AsRef<Path>,

Adds a directory to this archive with the given path as the name of the directory in the archive.

This will use stat to populate a Header, and it will then append the directory to the archive with the name path.

Note that this will not attempt to seek the archive to a valid position, so if the archive is in the middle of a read or some other similar operation then this may corrupt the archive.

Note this will not add the contents of the directory to the archive. See append_dir_all for recusively adding the contents of the directory.

Also note that after all files have been written to an archive the finish function needs to be called to finish writing the archive.

Examples

use std::fs;
use tar::Builder;

let mut ar = Builder::new(Vec::new());

// Use the directory at one location, but insert it into the archive
// with a different name.
ar.append_dir("bardir", ".").unwrap();

pub fn append_dir_all<P, Q>(&mut self, path: P, src_path: Q) -> Result<()>

where P: AsRef<Path>, Q: AsRef<Path>,

Adds a directory and all of its contents (recursively) to this archive with the given path as the name of the directory in the archive.

Note that this will not attempt to seek the archive to a valid position, so if the archive is in the middle of a read or some other similar operation then this may corrupt the archive.

Also note that after all files have been written to an archive the finish function needs to be called to finish writing the archive.

Examples

use std::fs;
use tar::Builder;

let mut ar = Builder::new(Vec::new());

// Use the directory at one location, but insert it into the archive
// with a different name.
ar.append_dir_all("bardir", ".").unwrap();

pub fn finish(&mut self) -> Result<()>

Finish writing this archive, emitting the termination sections.

This function should only be called when the archive has been written entirely and if an I/O error happens the underlying object still needs to be acquired.

In most situations the into_inner method should be preferred.

Trait Implementations

impl<W: Write> Drop for Builder<W>

fn drop(&mut self)

Executes the destructor for this type.