Crate composefs 

Rust bindings and utilities for working with composefs images and repositories.

Composefs is a read-only FUSE filesystem that enables efficient sharing of container filesystem layers by using content-addressable storage and fs-verity for integrity verification.

Modules

dumpfile

Reading and writing composefs dumpfile format.

dumpfile_parse

Parsing and generating composefs dump file entry

erofs

EROFS (Enhanced Read-Only File System) format support for composefs.

filesystem_ops

High-level filesystem operations for composefs trees.

fs

Reading and writing filesystem trees to/from disk.

fsverity

Linux fs-verity support for integrity verification.

generic_tree

A generic metadata-only filesystem tree where regular files can be stored however the caller wants.

mount

Modern Linux mount API support for composefs.

mountcompat

Compatibility helpers for older Linux kernel mount APIs.

repository

Content-addressable repository for composefs objects.

splitstream

Split Stream file format implementation.

tree

A filesystem tree which stores regular files using the composefs strategy of inlining small files, and having an external fsverity reference for larger ones.

util

Utility functions and types used throughout the composefs crate.

Constants

INLINE_CONTENT_MAX_V0

Files with this many bytes or fewer are stored inline in the erofs image (and in splitstreams). Files above this threshold are written to object storage and referenced via overlay metacopy xattrs.

MAX_INLINE_CONTENT

Maximum inline content size accepted when parsing untrusted input (dumpfiles, EROFS images in composefs-restricted mode).

SYMLINK_MAX

Maximum symlink target length in bytes.