Fuse-3.11.0

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.

[Note]

Note

Development versions of BLFS may not build or run some packages properly if dependencies have been updated since the most recent stable versions of the book.

Package Information

Fuse Dependencies

Optional

Doxygen-1.9.4 (to rebuild the API documentation) and pytest (required for tests)

User Notes: https://wiki.linuxfromscratch.org/blfs/wiki/fuse

Kernel Configuration

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

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

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

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

Installation of Fuse

Install Fuse by running the following commands:

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

mkdir build &&
cd    build &&

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

The API documentation is included in the package, but if you have Doxygen-1.9.4 installed and wish to rebuild it, issue:

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

To test the results, run (as the root user):

python3 -m pytest test/

The pytest 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 named test_ctests.py will produce a warning because a deprecated Python module is used.

Now, as the root user:

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

cd ..                          &&
install -v -m755 -d /usr/share/doc/fuse-3.11.0 &&
install -v -m644    doc/{README.NFS,kernel.txt} \
                    /usr/share/doc/fuse-3.11.0 &&
cp -Rv doc/html     /usr/share/doc/fuse-3.11.0

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-3.11.0

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