macfuse macfuse-5.2.0

General

• Update build process to use Xcode 26.4 (macOS 26.4 SDK)

• Introduce a new open source API for mounting volumes using the FSKit backend. The new API enables fully sandboxed file systems, which was not previously possible.

  • The actual mount operation is performed over XPC. This means the FSKit backend does no longer rely on fork()/exec() to mount volumes.
  • The new API is already used by libfuse and libfuse3
  • When sandboxing your file system server, add a Mach lookup exception for the io.macfuse.mount service
  • The new MFMount.framework is located in /Library/Filesystems/macfuse.fs/Contents/Frameworks
  • Please note that the new API may change in future releases

FSModule (FSKit Backend)

• Add support for a file system item's allocation size. Sparse files are not currently supported, so the value of this attribute is the item's size.

• Add a workaround for an FSKit/PluginKit issue that could prevent macFUSE volumes from being mounted after re-registering an already registered file system extension, requiring a restart of the FSKit subsystem.

• Remove the obsolete broker launch daemon io.macfuse.app.launchservice.broker, which was previously used to establish a connection between the file system extension and the file system server.

• Improve the built-in log command to detect whether the output destination supports colored output. This is useful when piping log output to a file.

  % /Library/Filesystems/macfuse.fs/Contents/Resources/macfuse.app/Contents/MacOS/macfuse log stream
  Executing /usr/bin/log stream --debug --info --predicate "subsystem in { 'com.apple.FSKit', 'com.apple.LiveFS', 'io.macfuse' }" --color always
  Filtering the log data using "subsystem IN {"com.apple.FSKit", "com.apple.LiveFS", "io.macfuse"}"
  ...
  

• Improve the built-in install command to support selecting which components to install. Supported options are privileged-helpers, file-system-extensions, and all. Omitting the component is equivalent to specifying all.

  % /Library/Filesystems/macfuse.fs/Contents/Resources/macfuse.app/Contents/MacOS/macfuse install --help  
  USAGE: macfuse install [--components <components> ...] [--force]
  
  OPTIONS:
    -c, --components <components>
                            Components to install (default: all)
    -f, --force
    -h, --help              Show help information.
  

• Introduce foundational changes in preparation for new features in macFUSE 5.3

libfuse

• Use new mount API MFMount.framework for mounting volumes using the FSKit backend

libfuse3

• Update libfuse3 to version 3.18.2

• Use new mount API MFMount.framework for mounting volumes using the FSKit backend

• Fix a bug when handling FUSE_RENAME messages with FUSE_DARWIN_CAP_RENAME_EXT enabled that could cause the source and destination file names to be parsed incorrectly.

Sponsor

• Work on this release has been sponsored by uint24 and others

• Your support is important to sustaining the future development of this project. If macFUSE makes your life easier, consider sponsoring the project through GitHub Sponsors.