Filesystem in Userspace

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Filesystem in Userspace (FUSE) provides a way for users to mount file systems without needing special permissions (mounting in Linux is generally reserved to those with administrative privileges).



KERNEL Enable support for FUSE
File systems  --->
    <*> FUSE (Filesystem in Userspace) support

USE flags

USE flags for sys-fs/fuse An interface for filesystems implemented in userspace

examples Install examples, usually source code
static-libs Build static versions of dynamic libraries as well
suid Enable setuid root program(s)
test Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)


As with most file systems, after building support for the file system into the kernel be sure to install the user space tools:

root #emerge --ask sys-fs/fuse



The following configuration files are available for FUSE:

  • /etc/fuse.conf

There are two configuration variables available in the fuse.conf file:

  • mount_max - Sets the maximum number of FUSE mounts allowed to non-root users (defaults to 1000 if unset).
  • user_allow_other - Allows non-root users to specify the allow_other or allow_root mount options. This is disabled for security reasons.



user $fusermount3 -h
fusermount3: [options] mountpoint
 -h                 print help
 -V                 print version
 -o opt[,opt...]   mount options
 -u                 unmount
 -q                 quiet
 -z                 lazy unmount

Mounting filesystems

Use the fusermount3 command:

user $fusermount3 /path/to/mountpoint

Unmounting filesystems

Filesystems can be unmounted using either the umount or the fusermount3 command:

user $fusermount3 -u /path/to/mountpoint


root #emerge --ask --depclean --verbose sys-fs/fuse



You may see an error message like the one below when executing an AppImage.

user $./app.appimage
AppImages require FUSE to run.
You might still be able to extract the contents of this AppImage
if you run it with the --appimage-extract option.
for more information

sys-fs/fuse provides fusermount3 but older AppImages may need sys-fs/fuse:0.

root #emerge --ask sys-fs/fuse:0

See also

  • Filesystem — a means to organize data to be retained after a program terminates.

External resources