Introduction to Fuse

FUSE (Filesystem in Userspace) is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. Fuse also aims to provide a secure method for non privileged users to create and mount their own filesystem implementations.

This package is known to build and work properly using an LFS 12.1 platform.

Package Information

Fuse Dependencies


Doxygen-1.10.0 (to rebuild the API documentation), pytest-8.0.0 (required for tests), and looseversion (for tests)

Kernel Configuration

Enable the following options in the kernel configuration and recompile the kernel if necessary:

File systems --->
  <*/M> FUSE (Filesystem in Userspace) support                         [FUSE_FS]

Character devices in userspace should be enabled too for running the tests:

File systems --->
  <*/M> FUSE (Filesystem in Userspace) support                         [FUSE_FS]
  <*/M>   Character device in Userspace support                           [CUSE]

Installation of Fuse

Install Fuse by running the following commands:

sed -i '/^udev/,$ s/^/#/' util/meson.build &&

mkdir build &&
cd    build &&

meson setup --prefix=/usr --buildtype=release .. &&

The API documentation is included in the package, but if you have Doxygen-1.10.0 installed and wish to rebuild it, issue:

pushd .. &&
  doxygen doc/Doxyfile &&

To test the results, issue the following commands (as the root user):

python3 -m venv --system-site-packages testenv &&
source testenv/bin/activate                    &&
pip3 install looseversion                      &&
python3 -m pytest

The pytest-8.0.0 Python module is required for the tests. One test named test_cuse will fail if the CONFIG_CUSE configuration item was not enabled when the kernel was built. One test, test/util.py, will output a warning due to the usage of an unknown mark in pytest. One test named test_notify_inval_entry[True-expire_entries] may fail under certain circumstances.

Now, as the root user:

ninja install                  &&
chmod u+s /usr/bin/fusermount3 &&

cd ..                          &&
cp -Rv doc/html -T /usr/share/doc/fuse-3.16.2 &&
install -v -m644   doc/{README.NFS,kernel.txt} \

Command Explanations

sed ... util/meson.build: This command disables the installation of a boot script and udev rule that are not needed.

--buildtype=release: Specify a buildtype suitable for stable releases of the package, as the default may produce unoptimized binaries.

Configuring fuse

Config Files

Some options regarding mount policy can be set in the file /etc/fuse.conf. To install the file run the following command as the root user:

cat > /etc/fuse.conf << "EOF"
# Set the maximum number of FUSE mounts allowed to non-root users.
# The default is 1000.
#mount_max = 1000

# Allow non-root users to specify the 'allow_other' or 'allow_root'
# mount options.

Additional information about the meaning of the configuration options are found in the man page.


Installed Programs: fusermount3 and mount.fuse3
Installed Libraries: libfuse3.so
Installed Directory: /usr/include/fuse3 and /usr/share/doc/fuse-3.16.2

Short Descriptions


is a suid root program to mount and unmount Fuse filesystems


is the command mount calls to mount a Fuse filesystem


contains the FUSE API functions