gnu: Add squashfs-tools-ng.

* gnu/packages/compression.scm (squashfs-tools-ng): New public variable.

gnu/packages/compression.scm

@@ -84,6 +84,7 @@
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages python)
   #:use-module (gnu packages qt)
+  #:use-module (gnu packages selinux)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages valgrind)
   #:use-module (gnu packages version-control)
@@ -904,6 +905,79 @@ for live media, and for embedded systems where low overhead is needed.
 This package allows you to create and extract such file systems.")
     (license license:gpl2+)))
 
+(define-public squashfs-tools-ng
+  (package
+    (name "squashfs-tools-ng")
+    (version "1.1.2")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/AgentD/squashfs-tools-ng")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "13gx6mc57wjjnrpnkb74zi2wiqazz2q715y1zz7rff02wh1vb5k9"))
+       (modules '((guix build utils)))
+       (snippet
+        '(begin
+           ;; Delete bundled third-party libraries.
+           (for-each (lambda (directory)
+                       (substitute* "Makefile.am"
+                         (((format #f "^include ~a.*" directory)) ""))
+                       (delete-file-recursively directory))
+                     (list "lib/lz4"
+                           "lib/zlib"))))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:configure-flags
+       (list "--disable-static")))
+    (native-inputs
+     `(("autoconf" ,autoconf)
+       ("automake" ,automake)
+       ("libtool" ,libtool)
+       ("pkg-config" ,pkg-config)))
+    (inputs
+     `(("libselinux" ,libselinux)
+
+       ;; Compression algorithms.
+       ("bzip2" ,bzip2)
+       ("lz4" ,lz4)
+       ("lzo" ,lzo)
+       ("xz" ,xz)
+       ("zlib" ,zlib)
+       ("zstd:lib" ,zstd "lib")))
+    (home-page "https://github.com/AgentD/squashfs-tools-ng")
+    (synopsis "Tools to create and extract squashfs file systems")
+    (description
+     "Squashfs is a highly compressed read-only file system for Linux.  It
+compresses files, inodes, and directories with one of several compressors.
+All blocks are packed to minimize the data overhead, and block sizes of
+between 4K and 1M are supported.  It is intended to be used for archival use,
+for live media, and for embedded systems where low overhead is needed.
+
+The squashfs-tools-ng package offers alternative tooling to create and extract
+such file systems.  It is not based on the older squashfs-tools package and
+its tools have different names:
+
+@enumerate
+@item @command{gensquashfs} produces SquashFS images from a directory or
+@command{gen_init_cpio}-like file listings and can generate SELinux labels.
+@item @command{rdsquashfs} inspects and unpacks SquashFS images.
+@item @command{sqfs2tar} and @command{tar2sqfs} convert between SquashFS and
+tarballs.
+@item @command{sqfsdiff} compares the contents of two SquashFS images.
+@end enumerate
+
+These commands are largely command-line wrappers around the included
+@code{libsquashfs} library that intends to make SquashFS available to other
+applications as an embeddable, extensible archive format.
+
+Both the library and tools operate deterministically: same input will produce
+byte-for-byte identical output.")
+    ;; Upstream goes to some lengths to ensure that libsquashfs is LGPL3+.
+    (license license:gpl3+)))
+
 (define-public pigz
   (package
     (name "pigz")