Module composefs_info 

composefs-info - Query information from composefs images.

This is a Rust reimplementation of the C composefs-info tool, providing commands to inspect EROFS images, list objects, and compute fs-verity digests.

Compatibility status

Implemented subcommands:

• ls — lists files with type suffixes, skips whiteout entries
• dump — outputs composefs-dump(5) text format (image → tree → dumpfile)
• objects — lists all backing file object paths (XX/XXXX…)
• missing-objects — lists objects not present in --basedir
• measure-file — computes fs-verity digest of files

Compatibility notes:

• measure-file tries FS_IOC_MEASURE_VERITY first; falls back to in-process computation when the kernel reports verity is absent or the filesystem doesn’t support it, matching the C lcfs_fd_get_fsverity() behaviour.

Structs

Cli 🔒

Query information from composefs images.

Enums

Command 🔒

Available subcommands.

Functions

cmd_dump 🔒

Dump the image in composefs-dump(5) text format.

cmd_ls 🔒

List files and directories in the image.

cmd_measure_file 🔒

Compute and print the fs-verity digest of each file.

cmd_missing_objects 🔒

List objects not present in basedir.

cmd_objects 🔒

List all object paths from the images.

collect_objects_from_fs 🔒

Collect all external object IDs from a parsed filesystem.

ls_print 🔒

Walk and print entries: directory line first, then recurse into children.

print_escaped 🔒

Print escaped path (matches C implementation behavior).

read_image 🔒

Read an entire image file into memory.

run

Entry point for the composefs-info multi-call mode.

run_from_args

Entry point when invoked as a hidden cfsctl composefs-info subcommand.

run_with_cli 🔒