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Mount a directory elsewhere with changed permissions.
C Ruby Groff Shell


bindfs -

bindfs is a FUSE filesystem for mirroring a directory to another directory, similarly to mount --bind. The permissions of the mirrored directory can be altered in various ways.

Some things bindfs can be used for:

  • Making a directory read-only.
  • Making all executables non-executable.
  • Sharing a directory with a list of users (or groups).
  • Modifying permission bits using rules with chmod-like syntax.
  • Changing the permissions with which files are created.

Non-root users can use almost all features, but most interesting use-cases need user_allow_other to be defined in /etc/fuse.conf.


Make sure FUSE 2.6.0 or above is installed ( Then compile and install as usual:

make install

If you want the mounts made by non-root users to be visible to other users, you may have to add the line user_allow_other to /etc/fuse.conf.

In Linux-based OSes, you may have to add your user to the fuse group.


See the bindfs --help or the man-page for instructions and examples.

OS X note

The following extra options may be useful under osxfuse:

-o local,allow_other,extended_security,noappledouble

See for details.

Test suite

Bindfs comes with a (somewhat brittle and messy) test suite. The test suite has two kinds of tests: those that have to be run as root and those that have to be run as non-root. To run all of the tests, do make check both as root and as non-root.

The test suite requires Ruby 2.0+ (1.9+ might also work). If you're using RVM then you may need to use rvmsudo instead of plain sudo to run the root tests.


GNU General Public License version 2 or any later version. See the file COPYING.

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