68 lines
3.2 KiB
Rust
68 lines
3.2 KiB
Rust
//! *pxar* Implementation (proxmox file archive format)
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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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//! efficient 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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//!
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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`. `HARDLINK`s 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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pub mod catalog;
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pub(crate) mod create;
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pub(crate) mod dir_stack;
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pub(crate) mod extract;
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pub(crate) mod metadata;
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pub mod flags;
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pub mod fuse;
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pub(crate) mod tools;
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pub use create::create_archive;
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pub use extract::extract_archive;
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/// The format requires to build sorted directory lookup tables in
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/// memory, so we restrict the number of allowed entries to limit
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/// maximum memory usage.
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pub const ENCODER_MAX_ENTRIES: usize = 1024 * 1024;
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pub use tools::{format_multi_line_entry, format_single_line_entry};
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