;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 John Darrington <jmd@gnu.org>
;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages mtools)
  #:use-module (guix licenses)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system gnu))

(define-public mtools
  (package
    (name "mtools")
    (version "4.0.18")
    (source
     (origin
      (method url-fetch)
      (uri (string-append "mirror://gnu/mtools/mtools-"
                          version ".tar.gz"))
      (sha256
       (base32
        "1hxciksv7av5ilnkvwbidyxxr1gzn24lr0mz9z8drkml7780im1h"))))
    (build-system gnu-build-system)
    (home-page "https://www.gnu.org/software/mtools/")
    (synopsis "Access MS-DOS disks without mounting")
    (description
     "GNU Mtools is a set of utilities for accessing MS-DOS disks from a GNU
or Unix system.  It supports long file names and multiple disk formats.  It
also supports some FAT-specific features such as volume labels and
FAT-specific file attributes.")
    (license gpl3+)))

(define-public exfat-utils
  (package
    (name "exfat-utils")
    (version "1.2.6")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "https://github.com/relan/exfat/releases/download/v"
                    version "/" name "-" version ".tar.gz"))
              (sha256
               (base32
                "0hxcz0y3rd79nycjlzaca9wh9qj64rw8rzm0xk4jk9ljry96csxr"))))
    (build-system gnu-build-system)
    (home-page "https://github.com/relan/exfat")
    (synopsis "Utilities to manipulate exFAT file systems")
    (description
     "This package provides an implementation of the exFAT file system,
including command-line tools to validate exFAT file systems and to create new
ones.")
    (license gpl2+)))
ft'>Age</th><th class='left'>Commit message (<a href='/guix/log/nix/libstore/local-store.hh?id=2ae2a15b075dd3c8d34f0c2e3af279e192931f45&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-11-16 14:34:28 +0100'>2021-11-16</span></td><td><a href='/guix/commit/nix/libstore/local-store.hh?id=472a0e82a52a3d5d841e1dfad6b13e26082a5750'>daemon: Do not deduplicate files smaller than 8 KiB.</a><span class='msg-avail'>...<span class='msg-tooltip'>Files smaller than 8 KiB typically represent ~70% of the entries in
/gnu/store/.links but only contribute to ~4% of the space savings
afforded by deduplication.

Not considering these files for deduplication speeds up file insertion
in the store and, more importantly, leaves 'removeUnusedLinks' with
fewer entries to traverse, thereby speeding it up proportionally.

Partly fixes &lt;https://issues.guix.gnu.org/24937&gt;.

* config-daemon.ac: Remove symlink hard link check and CAN_LINK_SYMLINK
definition.
* guix/store/deduplication.scm (%deduplication-minimum-size): New
variable.
(deduplicate)[loop]: Do not recurse when FILE's size is below
%DEDUPLICATION-MINIMUM-SIZE.
(dump-port): New procedure.
(dump-file/deduplicate)[hash]: Turn into...
[dump-and-compute-hash]: ... this thunk.
Call 'deduplicate' only when SIZE is greater than
%DEDUPLICATION-MINIMUM-SIZE; otherwise call 'dump-port'.
* nix/libstore/gc.cc (LocalStore::removeUnusedLinks): Drop files where
st.st_size &lt; deduplicationMinSize.
* nix/libstore/local-store.hh (deduplicationMinSize): New declaration.
* nix/libstore/optimise-store.cc (deduplicationMinSize): New variable.
(LocalStore::optimisePath_): Return when PATH is a symlink or smaller
than 'deduplicationMinSize'.
* tests/derivations.scm ("identical files are deduplicated"): Produce
files bigger than %DEDUPLICATION-MINIMUM-SIZE.
* tests/nar.scm ("restore-file-set with directories (signed, valid)"):
Likewise.
* tests/store-deduplication.scm ("deduplicate, below %deduplication-minimum-size"):
New test.
("deduplicate", "deduplicate, ENOSPC"): Produce files bigger than
%DEDUPLICATION-MINIMUM-SIZE.
* tests/store.scm ("substitute, deduplication"): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>