63 lines
2.8 KiB
Rust
63 lines
2.8 KiB
Rust
//! *pxar* Implementation
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//!
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//! This code implements a slightly modified version of the *catar*
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//! format used in the [casync](https://github.com/systemd/casync)
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//! toolkit (we are not 100% binary compatible). It is a file archive
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//! format defined by 'Lennart Poettering', specially defined for
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//! efficent deduplication.
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//! Every archive contains items in the following order:
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//! * ENTRY -- containing general stat() data and related bits
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//! * USER -- user name as text, if enabled
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//! * GROUP -- group name as text, if enabled
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//! * XATTR -- one extended attribute
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//! * ... -- more of these when there are multiple defined
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//! * ACL_USER -- one USER ACL entry
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//! * ... -- more of these when there are multiple defined
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//! * ACL_GROUP -- one GROUP ACL entry
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//! * ... -- more of these when there are multiple defined
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//! * ACL_GROUP_OBJ -- The ACL_GROUP_OBJ
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//! * ACL_DEFAULT -- The various default ACL fields if there's one defined
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//! * ACL_DEFAULT_USER -- one USER ACL entry
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//! * ... -- more of these when multiple are defined
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//! * ACL_DEFAULT_GROUP -- one GROUP ACL entry
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//! * ... -- more of these when multiple are defined
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//! * FCAPS -- file capability in Linux disk format
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//! * QUOTA_PROJECT_ID -- the ext4/xfs quota project ID
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//! * PAYLOAD -- file contents, if it is one
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//! * SYMLINK -- symlink target, if it is one
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//! * DEVICE -- device major/minor, if it is a block/char device
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//!
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//! If we are serializing a directory, then this is followed by:
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//!
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//! * FILENAME -- name of the first directory entry (strictly ordered!)
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//! * <archive> -- serialization of the first directory entry's metadata and contents,
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//! following the exact same archive format
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//! * FILENAME -- name of the second directory entry (strictly ordered!)
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//! * <archive> -- serialization of the second directory entry
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//! * ...
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//! * GOODBYE -- lookup table at the end of a list of directory entries
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///! The original format has no way to deal with hardlinks, so we
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///! extended the format by a special HARDLINK tag, which can replace
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///! an ENTRY tag. The HARDLINK tag contains an 64bit offset which
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///! points to the linked ENTRY inside the archive, followed by the
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///! full path name of that ENTRY. HARDLINKs may not have further data
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///! (user, group, acl, ...) because this is already defined by the
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///! linked ENTRY.
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mod binary_search_tree;
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pub use binary_search_tree::*;
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mod format_definition;
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pub use format_definition::*;
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mod encoder;
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pub use encoder::*;
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mod sequential_decoder;
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pub use sequential_decoder::*;
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mod decoder;
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pub use decoder::*;
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