Ports: Add libfuse

This is essentially the de facto way to interface with FUSE, and as
such, pretty much every port that uses FUSE in any way will depend on
this. Of all the examples that we compile, 'hello', 'hello_ll' and
'passthrough' have been verified to work.

Ports/AvailablePorts.md

@@ -148,6 +148,7 @@ This list is also available at [ports.serenityos.net](https://ports.serenityos.n
 | [`libfftw3`](libfftw3/)                             | Fastest Fourier Transform in the West (double precision)        | 3.3.10                    | https://www.fftw.org/                                                          |
 | [`libfftw3f`](libfftw3f/)                           | Fastest Fourier Transform in the West (single precision)        | 3.3.10                    | https://www.fftw.org/                                                          |
 | [`libfts`](libfts/)                                 | libfts                                                          | 1.2.7                     | https://github.com/void-linux/musl-fts                                         |
+| [`libfuse`](libfuse/)                               | libfuse                                                         | 3.16.2                    | https://github.com/libfuse/libfuse                                             |
 | [`libgcrypt`](libgcrypt/)                           | libgcrypt                                                       | 1.10.3                    | https://gnupg.org/software/libgcrypt/index.html                                |
 | [`libgd`](libgd/)                                   | libgd                                                           | 2.3.3                     | https://libgd.github.io/                                                       |
 | [`libgpg-error`](libgpg-error/)                     | libgpg-error                                                    | 1.48                      | https://gnupg.org/software/libgpg-error/index.html                             |

Ports/libfuse/package.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port='libfuse'
+version='3.16.2'
+files=(
+    "https://github.com/libfuse/libfuse/releases/download/fuse-${version}/fuse-${version}.tar.gz#f797055d9296b275e981f5f62d4e32e089614fc253d1ef2985851025b8a0ce87"
+)
+useconfigure='true'
+configopts=(
+    "--cross-file=${SERENITY_BUILD_DIR}/meson-cross-file.txt"
+)
+workdir="fuse-${version}"
+
+configure() {
+    run meson _build "${configopts[@]}"
+}
+
+build() {
+    run ninja -C _build
+}
+
+install() {
+    export DESTDIR="${SERENITY_INSTALL_ROOT}"
+    run meson install -C _build
+}

Ports/libfuse/patches/0001-Disable-unsupported-functionality.patch

@@ -0,0 +1,239 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: implicitfield <114500360+implicitfield@users.noreply.github.com>
+Date: Mon, 5 Feb 2024 00:55:02 +0400
+Subject: [PATCH] Disable unsupported functionality
+
+---
+ example/meson.build         | 11 +++++------
+ include/fuse_mount_compat.h |  2 ++
+ lib/fuse_loop_mt.c          |  4 ++++
+ lib/meson.build             |  6 ++++--
+ lib/mount_bsd.c             | 19 +++++++++++++++++++
+ lib/mount_util.c            |  4 ++++
+ meson.build                 |  2 +-
+ test/meson.build            |  2 ++
+ 8 files changed, 41 insertions(+), 9 deletions(-)
+
+diff --git a/example/meson.build b/example/meson.build
+index e641543..3ee2630 100644
+--- a/example/meson.build
++++ b/example/meson.build
+@@ -1,9 +1,8 @@
+-examples = [ 'passthrough', 'passthrough_fh',
+-             'hello', 'hello_ll', 'hello_ll_uds',
+-             'printcap', 'ioctl_client', 'poll_client',
+-             'ioctl', 'cuse', 'cuse_client' ]
++examples = [ 'passthrough',
++             'hello', 'hello_ll',
++             'printcap', 'poll_client'  ]
+ 
+-if not platform.endswith('bsd') and platform != 'dragonfly'
++if not platform.endswith('bsd') and platform != 'dragonfly' and platform != 'serenity'
+     examples += 'passthrough_ll'
+ 
+     # According to Conrad Meyer <cem@freebsd.org>, FreeBSD doesn't
+@@ -31,7 +30,7 @@ foreach ex : threaded_examples
+                install: false)
+ endforeach
+ 
+-if not platform.endswith('bsd') and platform != 'dragonfly' and add_languages('cpp', required : false)
++if not platform.endswith('bsd') and platform != 'dragonfly' and platform != 'serenity' and add_languages('cpp', required : false)
+     executable('passthrough_hp', 'passthrough_hp.cc',
+                dependencies: [ thread_dep, libfuse_dep ],
+                install: false)
+diff --git a/include/fuse_mount_compat.h b/include/fuse_mount_compat.h
+index 0142b51..f52b8f5 100644
+--- a/include/fuse_mount_compat.h
++++ b/include/fuse_mount_compat.h
+@@ -11,7 +11,9 @@
+ #ifndef FUSE_MOUNT_COMPAT_H_
+ #define FUSE_MOUNT_COMPAT_H_
+ 
++#ifndef __serenity__
+ #include <sys/mount.h>
++#endif
+ 
+ /* Some libc don't define MS_*, so define them manually
+  * (values taken from https://elixir.bootlin.com/linux/v4.0.9/source/include/uapi/linux/fs.h#L68 on)
+diff --git a/lib/fuse_loop_mt.c b/lib/fuse_loop_mt.c
+index 0200d73..edef914 100644
+--- a/lib/fuse_loop_mt.c
++++ b/lib/fuse_loop_mt.c
+@@ -242,6 +242,7 @@ int fuse_start_thread(pthread_t *thread_id, void *(*func)(void *), void *arg)
+ 	return 0;
+ }
+ 
++#ifndef __serenity__
+ static struct fuse_chan *fuse_clone_chan(struct fuse_mt *mt)
+ {
+ 	int res;
+@@ -275,6 +276,7 @@ static struct fuse_chan *fuse_clone_chan(struct fuse_mt *mt)
+ 
+ 	return newch;
+ }
++#endif
+ 
+ static int fuse_loop_start_thread(struct fuse_mt *mt)
+ {
+@@ -290,6 +292,7 @@ static int fuse_loop_start_thread(struct fuse_mt *mt)
+ 	w->mt = mt;
+ 
+ 	w->ch = NULL;
++#ifndef __serenity__
+ 	if (mt->clone_fd) {
+ 		w->ch = fuse_clone_chan(mt);
+ 		if(!w->ch) {
+@@ -299,6 +302,7 @@ static int fuse_loop_start_thread(struct fuse_mt *mt)
+ 			mt->clone_fd = 0;
+ 		}
+ 	}
++#endif
+ 
+ 	res = fuse_start_thread(&w->thread_id, fuse_do_work, w);
+ 	if (res == -1) {
+diff --git a/lib/meson.build b/lib/meson.build
+index 9044630..93fecc8 100644
+--- a/lib/meson.build
++++ b/lib/meson.build
+@@ -28,8 +28,10 @@ if host_machine.system().startswith('netbsd')
+    deps += [ cc.find_library('perfuse'),
+              cc.find_library('puffs') ]
+ else
+-   # Required for clock_gettime before glibc 2.17
+-   deps += cc.find_library('rt')
++   if host_machine.system() != 'serenity'
++      # Required for clock_gettime before glibc 2.17
++      deps += cc.find_library('rt')
++   endif
+ endif
+ 
+ fusermount_path = join_paths(get_option('prefix'), get_option('bindir'))
+diff --git a/lib/mount_bsd.c b/lib/mount_bsd.c
+index 73abc67..666be7f 100644
+--- a/lib/mount_bsd.c
++++ b/lib/mount_bsd.c
+@@ -8,7 +8,9 @@
+   See the file COPYING.LIB.
+ */
+ 
++#ifndef __serenity__
+ #include "config.h"
++#endif
+ #include "fuse_i.h"
+ #include "fuse_misc.h"
+ #include "fuse_opt.h"
+@@ -18,8 +20,10 @@
+ 
+ #include <sys/stat.h>
+ #include <sys/wait.h>
++#ifndef __serenity__
+ #include <sys/sysctl.h>
+ #include <sys/user.h>
++#endif
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <unistd.h>
+@@ -50,6 +54,10 @@ struct mount_opts {
+ static const struct fuse_opt fuse_mount_opts[] = {
+ 	{ "allow_other", offsetof(struct mount_opts, allow_other), 1 },
+ 	{ "max_read=%u", offsetof(struct mount_opts, max_read), 1 },
++#ifdef __serenity__
++	FUSE_DUAL_OPT_KEY("allow_other",	KEY_KERN),
++	FUSE_OPT_KEY("max_read=",		KEY_KERN),
++#else
+ 	FUSE_OPT_KEY("-r",			KEY_RO),
+ 	/* standard FreeBSD mount options */
+ 	FUSE_DUAL_OPT_KEY("dev",		KEY_KERN),
+@@ -95,6 +103,7 @@ static const struct fuse_opt fuse_mount_opts[] = {
+ 	 * handle them
+ 	 */
+ 	FUSE_OPT_KEY("fsname=",			KEY_KERN),
++#endif
+ 	FUSE_OPT_END
+ };
+ 
+@@ -115,10 +124,12 @@ static int fuse_mount_opt_proc(void *data, const char *arg, int key,
+ 	struct mount_opts *mo = data;
+ 
+ 	switch (key) {
++#ifndef __serenity__
+ 	case KEY_RO:
+ 		arg = "ro";
+ 		/* fall through */
+ 
++#endif
+ 	case KEY_KERN:
+ 		return fuse_opt_add_opt(&mo->kernel_opts, arg);
+ 	}
+@@ -130,12 +141,19 @@ static int fuse_mount_opt_proc(void *data, const char *arg, int key,
+ void fuse_kern_unmount(const char *mountpoint, int fd)
+ {
+ 	close(fd);
++#ifdef __serenity__
++	umount(mountpoint);
++#else
+ 	unmount(mountpoint, MNT_FORCE);
++#endif
+ }
+ 
+ /* Check if kernel is doing init in background */
+ static int init_backgrounded(void)
+ {
++#ifdef __serenity__
++	return 0;
++#else
+ 	unsigned ibg;
+ 	size_t len;
+ 
+@@ -145,6 +163,7 @@ static int init_backgrounded(void)
+ 		return 0;
+ 
+ 	return ibg;
++#endif
+ }
+ 
+ 
+diff --git a/lib/mount_util.c b/lib/mount_util.c
+index 8027a2e..cb305da 100644
+--- a/lib/mount_util.c
++++ b/lib/mount_util.c
+@@ -37,6 +37,10 @@
+ #define umount2(mnt, flags) unmount(mnt, ((flags) == 2) ? MNT_FORCE : 0)
+ #endif
+ 
++#if defined(__serenity__)
++#define umount2(mnt, flags) umount(mnt)
++#endif
++
+ #ifdef IGNORE_MTAB
+ #define mtab_needs_update(mnt) 0
+ #else
+diff --git a/meson.build b/meson.build
+index 042c19c..bfddbb7 100644
+--- a/meson.build
++++ b/meson.build
+@@ -205,7 +205,7 @@ thread_dep = dependency('threads')
+ # Read build files from sub-directories
+ #
+ subdirs = [ 'lib', 'include']
+-if get_option('utils') and not platform.endswith('bsd') and platform != 'dragonfly'
++if get_option('utils') and not platform.endswith('bsd') and platform != 'dragonfly' and platform != 'serenity'
+   subdirs += [ 'util', 'doc' ]
+ endif
+ 
+diff --git a/test/meson.build b/test/meson.build
+index 3d74b9a..cc09527 100644
+--- a/test/meson.build
++++ b/test/meson.build
+@@ -7,9 +7,11 @@ foreach prog: [ 'test_write_cache', 'test_setattr' ]
+                      dependencies: thread_dep,
+                      install: false)
+ endforeach
++if platform != 'serenity'
+ td += executable('test_syscalls', 'test_syscalls.c',
+                  include_directories: include_dirs,
+                  install: false)
++endif
+ td += executable('readdir_inode', 'readdir_inode.c',
+                  include_directories: include_dirs,
+                  install: false)

Ports/libfuse/patches/0002-Install-examples.patch

@@ -0,0 +1,30 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: implicitfield <114500360+implicitfield@users.noreply.github.com>
+Date: Mon, 5 Feb 2024 01:05:50 +0400
+Subject: [PATCH] Install examples
+
+---
+ example/meson.build | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/example/meson.build b/example/meson.build
+index 3ee2630..4f39c68 100644
+--- a/example/meson.build
++++ b/example/meson.build
+@@ -20,14 +20,14 @@ threaded_examples = [ 'notify_inval_inode',
+ foreach ex : examples
+     executable(ex, ex + '.c',
+                dependencies: [ libfuse_dep ],
+-               install: false)
++               install: true)
+ endforeach
+ 
+ 
+ foreach ex : threaded_examples
+     executable(ex, ex + '.c',
+                dependencies: [ thread_dep, libfuse_dep ],
+-               install: false)
++               install: true)
+ endforeach
+ 
+ if not platform.endswith('bsd') and platform != 'dragonfly' and platform != 'serenity' and add_languages('cpp', required : false)

Ports/libfuse/patches/0003-Teach-the-mount-helpers-about-serenity.patch

@@ -0,0 +1,48 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: implicitfield <114500360+implicitfield@users.noreply.github.com>
+Date: Mon, 5 Feb 2024 19:34:40 +0400
+Subject: [PATCH] Teach the mount helpers about serenity
+
+---
+ lib/helper.c    | 4 ++++
+ lib/mount_bsd.c | 4 ++++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/lib/helper.c b/lib/helper.c
+index 14a0df3..133904b 100644
+--- a/lib/helper.c
++++ b/lib/helper.c
+@@ -178,6 +178,9 @@ static int fuse_helper_opt_proc(void *data, const char *arg, int key,
+    function actually sets the fsname */
+ static int add_default_subtype(const char *progname, struct fuse_args *args)
+ {
++#ifdef __serenity__
++	return 0;
++#else
+ 	int res;
+ 	char *subtype_opt;
+ 
+@@ -200,6 +203,7 @@ static int add_default_subtype(const char *progname, struct fuse_args *args)
+ 	res = fuse_opt_add_arg(args, subtype_opt);
+ 	free(subtype_opt);
+ 	return res;
++#endif
+ }
+ 
+ int fuse_parse_cmdline_312(struct fuse_args *args,
+diff --git a/lib/mount_bsd.c b/lib/mount_bsd.c
+index 666be7f..0dac299 100644
+--- a/lib/mount_bsd.c
++++ b/lib/mount_bsd.c
+@@ -34,7 +34,11 @@
+ #include <paths.h>
+ #include <limits.h>
+ 
++#ifdef __serenity__
++#define FUSERMOUNT_PROG		"fusermount"
++#else
+ #define FUSERMOUNT_PROG		"mount_fusefs"
++#endif
+ #define FUSE_DEV_TRUNK		"/dev/fuse"
+ 
+ enum {

Ports/libfuse/patches/ReadMe.md

@@ -0,0 +1,14 @@
+# Patches for libfuse on SerenityOS
+
+## `0001-Disable-unsupported-functionality.patch`
+
+Disable unsupported functionality
+
+## `0002-Install-examples.patch`
+
+Install examples
+
+## `0003-Teach-the-mount-helpers-about-serenity.patch`
+
+Teach the mount helpers about serenity
+