SquashFS is a highly compressed read-only filesystem for Linux,
optimized for small size and high packing density. It is widely used
in embedded systems and bootable live media.

SquashFS supports many different compression formats, such as zstd,
xz, zlib or lzo for both data and metadata compression. It has many
features expected from popular filesystems, such as extended
attributes and support for NFS export.

As the name suggests, this is not the original user space tooling for
SquashFS. Here are some of the features that primarily distinguish
this package from the original:

- reproducible SquashFS images, i.e. deterministic packing without
any local time stamps,
- Linux `gen_init_cpio` like file listing for micro managing the
file system contents, permissions, and ownership without having to
replicate the file system (and especially permissions) locally,
- support for SELinux contexts file (see selabel_file(5)) to generate
SELinux labels.