Module mkcomposefs 

mkcomposefs - Create composefs images from directories or dumpfiles.

This is a Rust reimplementation of the C mkcomposefs tool, providing compatible command-line interface and output format.

Compatibility status

See https://github.com/composefs/composefs/discussions/423 for context.

Implemented and tested (byte-for-byte match with C mkcomposefs):

• --from-file, --print-digest, --print-digest-only
• --skip-devices, --skip-xattrs, --user-xattrs
• --min-version / --max-version (V1 compact inodes, BFS ordering, whiteout table)
• --digest-store (C-compatible flat XX/digest layout via [FlatDigestStore])
• --threads (controls tokio worker threads and verity-computation concurrency)
• Source from directory or dumpfile, output to file or stdout

Bit-for-bit compatible with the C mkcomposefs by default; use --hardlinks to enable host hard-link deduplication (shared EROFS inodes, i_nlink > 1).

Structs

Args 🔒

Create a composefs image from a source directory or dumpfile.

Functions

apply_transformations 🔒

Apply filesystem transformations based on command-line flags.

compute_fsverity_digest 🔒

Compute the fsverity digest of the image.

read_directory 🔒

Read a filesystem tree from a directory path.

read_dumpfile 🔒

Read and parse a dumpfile from the given source.

remove_device_nodes 🔒

Remove all device nodes (block and character devices) from the filesystem.

run

Entry point for the mkcomposefs multi-call mode.

run_from_args

Entry point when invoked as a hidden cfsctl mkcomposefs subcommand.

run_with_args 🔒

set_all_mtimes_to_epoch 🔒

Set all modification times in the filesystem to Unix epoch (0).

write_image 🔒

Write the image to the specified path (or stdout if -).