#### Beyond Linux® From Scratch (System V Edition) - Version 12.3

### Chapter 5. File Systems and Disk Management

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# Fuse-3.16.2

## 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 12.3 platform.

### Package Information

- Download (HTTP): https://github.com/libfuse/libfuse/releases/download/fuse-3.16.2/fuse-3.16.2.tar.gz

- Download MD5 sum: b00bf08b27ead4a9411578777e94a1cc

- Download size: 14 MB

- Estimated disk space required: 222 MB (with tests and documentation)

- Estimated build time: 0.2 SBU (add 0.3 SBU for tests)

### Fuse Dependencies

#### Optional

Doxygen-1.13.2 (to rebuild the API documentation), pytest-8.3.4 (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 .. &&
    ninja

The API documentation is included in the package, but if you have Doxygen-1.13.2 installed and wish to rebuild it, issue:

    pushd .. &&
      doxygen doc/Doxyfile &&
    popd

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
    deactivate

The pytest-8.3.4 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.

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} \
                       /usr/share/doc/fuse-3.16.2

## 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.
    #
    #user_allow_other
    EOF

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

## Contents

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

fusermount3 | is a suid root program to mount and unmount Fuse filesystems
mount.fuse3 | is the command mount calls to mount a Fuse filesystem
`libfuse3.so` | contains the FUSE API functions

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