[bug#73842,v2,1/3] gnu: appimage: New packages for the appimage runtime.

diff --git a/gnu/packages/appimage.scm b/gnu/packages/appimage.scm
new file mode 100644
index 0000000000..028b59ab30
--- /dev/null
+++ b/gnu/packages/appimage.scm
@@ -0,0 +1,133 @@ 
+;;; 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 download)
+  #:use-module (guix gexp)
+  #:use-module (guix git-download)
+  #:use-module (guix packages)
+  #:use-module (guix utils))
+
+(define 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 #$original-flags '("--default-library=static")))))))
+
+(define squashfuse-for-appimage
+    (package
+      (inherit squashfuse)
+      (arguments
+       (list
+        #:configure-flags #~'("CFLAGS=-ffunction-sections -fdata-sections -Os -no-pie"
+                              "LDFLAGS=-static")
+        #:phases #~(modify-phases %standard-phases
+                     (add-after 'install 'install-private-headers
+                       (lambda _
+                         (install-file "fuseprivate.h"
+                                       (string-append #$output
+                                                      "/include/squashfuse/")))))))
+      (inputs (list fuse-for-appimage
+                    `(,zstd "lib")
+                    `(,zstd "static")
+                    `(,zlib "out")
+                    `(,zlib "static")))))
+
+(define-public 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"
+                                            #$fuse-2
+                                            "/include/fuse/"
+                                            " -DGIT_COMMIT='\""
+                                            "guix-"
+                                            #$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 #$output "/bin"))))
+                     ;; must be after all elf reliant phases
+                     (add-after 'make-dynamic-linker-cache 'set-magic-bytes
+                       (lambda _
+                         (let ((port (open (string-append #$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 zstd zlib)))
+      ;; 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 FUSE and executes the entrypoint.")
+      (license license:expat))))