gnu: Add cl-tar-file.

* gnu/packages/lisp-xyz.scm (sbcl-tar-file, cl-tar-file, ecl-tar-file):
  New variables.

Signed-off-by: Guillaume Le Vaillant <glv@posteo.net>

gnu/packages/lisp-xyz.scm

@@ -9526,6 +9526,55 @@ archives such as those generated by the tar and cpio programs on Unix.")
 (define-public ecl-archive
   (sbcl-package->ecl-package sbcl-archive))
 
+(define-public sbcl-tar-file
+  (let ((commit "0c10bc82f14702c97a26dc25ce075b5d3a2347d1")
+        (revision "0"))
+    (package
+      (name "sbcl-tar-file")
+      (version (git-version "0.2.1" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://gitlab.common-lisp.net/cl-tar/cl-tar-file")
+               (commit commit)))
+         (file-name (git-file-name "cl-tar-file" version))
+         (sha256
+          (base32 "0i8j05fkgdqy4c4pqj0c68sh4s3klpx9kc5wp73qwzrl3xqd2svy"))))
+      (build-system asdf-build-system/sbcl)
+      (native-inputs
+       (list sbcl-parachute))
+      (inputs
+       (list sbcl-40ants-doc
+             sbcl-alexandria
+             sbcl-babel
+             sbcl-chipz
+             sbcl-flexi-streams
+             sbcl-salza2
+             sbcl-trivial-gray-streams))
+      (home-page "https://gitlab.common-lisp.net/cl-tar/cl-tar-file")
+      (synopsis "Read and write physical entries to and from tar files")
+      (description
+       "@code{cl-tar-file} is a Common Lisp library that allows reading from
+and writing to various tar archive formats.  Currently supported are the POSIX
+ustar, PAX (ustar with a few new entry types), GNU, and v7 (very old) formats.
+
+This library is rather low level and is focused exclusively on reading and
+writing physical tar file entries using streams.  Therefore, it contains no
+functionality for automatically building archives from a set of files on the
+filesystem or writing the contents of a file to the filesystem.  Additionally,
+there are no smarts that read multiple physical entries and combine them into
+a single logical entry (e.g., with PAX extended headers or GNU long link/path
+name support).  For a higher-level library that reads and writes logical
+entries, and also includes filesystem integration, see @code{cl-tar}.")
+      (license license:bsd-3))))
+
+(define-public cl-tar-file
+  (sbcl-package->cl-source-package sbcl-tar-file))
+
+(define-public ecl-tar-file
+  (sbcl-package->ecl-package sbcl-tar-file))
+
 (define-public sbcl-misc-extensions
   (let ((commit "101c05112bf2f1e1bbf527396822d2f50ca6327a")
         (revision "1"))