gnu: appimage: New packages for the appimage runtime.

* gnu/packages/appimage.scm
(gnu packages appimage): New module.
(appimage-type2-runtime): New variable.
* gnu/packages/file-systems.scm (squashfuse-for-appimage):
New variable.
* gnu/packages/linux.scm (fuse-for-appimage): New variable.

Change-Id: I857a8eb5399a6a493e52db70b6c8cf0c71360930
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/local.mk

@@ -67,6 +67,7 @@
 # Copyright © 2024 David Elsing <david.elsing@posteo.net>
 # Copyright © 2024 Ashish SHUKLA <ashish.is@lostca.se>
 # Copyright © 2024 Fabio Natali <me@fabionatali.com>
+# Copyright © 2024 Noé Lopez <noelopez@free.fr>
 #
 # This file is part of GNU Guix.
 #
@@ -139,6 +140,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/apl.scm				\
   %D%/packages/apple.scm			\
   %D%/packages/apparmor.scm			\
+  %D%/packages/appimage.scm			\
   %D%/packages/apr.scm				\
   %D%/packages/arcan.scm			\
   %D%/packages/aspell.scm			\

gnu/packages/appimage.scm

@@ -0,0 +1,97 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2024 Noé Lopez <noelopez@free.fr>
+;;;
+;;; 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 appimage)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages base)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages file-systems)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix gexp)
+  #:use-module (guix git-download)
+  #:use-module (guix packages)
+  #:use-module (guix utils))
+
+(define-public appimage-type2-runtime
+  (let ((revision "0")
+        ;; No releases, just the latest commit.
+        (commit "47b665594856b4e8928f8932adcf6d13061d8c30"))
+    (package
+      (name "appimage-type2-runtime")
+      (version (git-version "continuous" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/AppImage/type2-runtime")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "0954crhlbapxis96g1s0vfpf78ybr64zvjalak387ksxj560g44x"))))
+      (arguments
+       (list
+        #:make-flags
+        #~(list "-Csrc/runtime" "runtime-fuse3"
+                (string-append
+                 "CFLAGS=" "-I" #$(this-package-input "fuse") "/include/fuse/"
+                 " -DGIT_COMMIT='\"" "guix-" #$version "\"'"
+                 " -D_FILE_OFFSET_BITS=64"
+                 " -static"))
+        #:modules
+        `((guix build gnu-build-system)
+          (guix build utils)
+          (ice-9 binary-ports))
+        #:phases #~(modify-phases %standard-phases
+                     (delete 'configure)
+                     (delete 'check)    ; No tests.
+                     (replace 'install
+                       (lambda _
+                         (install-file "src/runtime/runtime-fuse3"
+                                       (string-append #$output "/bin"))))
+                     ;; Must be after all elf reliant phases.  Used to identify the
+                     ;; executable as an AppImage as per the specification.
+                     (add-after 'make-dynamic-linker-cache 'set-magic-bytes
+                       (lambda _
+                         (let ((port (open (string-append #$output
+                                            "/bin/runtime-fuse3")
+                                           (logior O_WRONLY))))
+                           (seek port 8 SEEK_SET)
+                           (put-bytevector port #vu8(#x41 #x49 #x02))
+                           (close-port port)))))
+        #:disallowed-references (list squashfuse-for-appimage
+                                      fuse-for-appimage
+                                      (gexp-input zstd "static")
+                                      (gexp-input zlib "static"))))
+      ;; Only needed at build time.
+      (inputs (list squashfuse-for-appimage
+                    fuse-for-appimage
+                    `(,zstd "static")
+                    `(,zlib "static")))
+      (build-system gnu-build-system)
+      (home-page "https://github.com/AppImage/type2-runtime")
+      (synopsis "Runtime for executing AppImages")
+      (description "The runtime is the executable part of every AppImage.  It mounts
+the payload via @acronym{FUSE} and executes the entrypoint, allowing users to run
+applications in a portable manner without the need for installation.  This runtime
+ensures that the AppImage can access its bundled libraries and resources seamlessly,
+providing a consistent environment across different Linux distributions.  In the
+absence of @acronym{FUSE}, the AppImage can still be started using the
+@option{--appimage-extract-and-run} flag.")
+      (license license:expat))))

gnu/packages/file-systems.scm

@@ -2059,6 +2059,27 @@ (define-public squashfuse
 memory-efficient.")
     (license license:bsd-2)))
 
+(define-public squashfuse-for-appimage
+    (package
+      (inherit squashfuse)
+      (arguments
+       (list
+        #:configure-flags
+        #~'("CFLAGS=-ffunction-sections -fdata-sections -Os -no-pie"
+            "LDFLAGS=-static")
+        #:phases
+        #~(modify-phases %standard-phases
+            (add-after 'install 'install-private-headers
+              (lambda _
+                (install-file "fuseprivate.h"
+                              (string-append #$output
+                                             "/include/squashfuse/")))))))
+      (inputs (list fuse-for-appimage
+                    `(,zstd "lib")
+                    `(,zstd "static")
+                    `(,zlib "out")
+                    `(,zlib "static")))))
+
 (define-public tmsu
   (package
     (name "tmsu")

gnu/packages/linux.scm

@@ -4067,6 +4067,23 @@ (define-public fuse-2
                (("-DFUSERMOUNT_DIR=[[:graph:]]+")
                 "-DFUSERMOUNT_DIR=\\\"/var/empty\\\"")))))))))
 
+(define-public fuse-for-appimage
+  (package
+    (inherit fuse)
+    (name "fuse")
+    (version "3.16.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://github.com/libfuse/libfuse/releases/"
+                           "download/fuse-" version "/fuse-" version ".tar.gz"))
+       (sha256
+        (base32 "11yfl2w2a445hllyzlakq97n32g06972vxpmh7lpbclnj9fhb5zp"))))
+    (arguments
+     (substitute-keyword-arguments (package-arguments fuse)
+       ((#:configure-flags original-flags #~(list))
+        #~(append #$original-flags '("--default-library=static")))))))
+
 (define-public unionfs-fuse
   (package
     (name "unionfs-fuse")