Crate fstool 

fstool — build disk images and filesystems from a directory tree and TOML spec.

The crate is organised as a stack of three trait-based layers:

• block — BlockDevice: raw seekable byte storage. Backends include on-disk files, in-memory buffers (for tests), and sub-range slices used to give each partition an isolated view.
• part — PartitionTable: MBR and GPT. (Coming in P2.)
• fs — Filesystem: ext2/3/4 in v1; FAT32 deferred. (Coming in P3+.)

High-level entry points for building or inspecting an image live at the crate root once P5 lands.

Re-exports

pub use error::Error;

pub use error::Result;

Modules

block

Block-device abstraction — the bottom layer of the fstool stack.

compression

Compression / decompression codecs.

error

Error type and Result alias for the crate.

fs

Filesystem layer — the Filesystem trait and shared types.

inspect

Unified read-side API: probe an image, identify the filesystem on it, and expose a small inspection surface (list / cat / info) that the CLI can drive without knowing which filesystem it’s talking to.

merge

Layered source merging with whiteout / opaque-dir semantics.

part

Partition-table layer.

repack

Repack — copy file trees from one source into a freshly-formatted destination filesystem.

spec

TOML image-specification schema and the build driver.