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pypipkg:pypi/pyfuse3@3.4.x

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examples

anti-patterns.mdcommon-patterns.mdedge-cases.mdreal-world-scenarios.md
index.md
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tessl/pypi-pyfuse3

tessl install tessl/pypi-pyfuse3@3.4.0

Python 3 bindings for libfuse 3 with async I/O support

anti-patterns.mddocs/examples/

Anti-Patterns

Common mistakes and what to do instead.

Wrong Exception Type

❌ Wrong

async def lookup(self, parent_inode, name, ctx):
    if name not in self.entries:
        raise KeyError("Not found")  # Crashes filesystem!

✅ Correct

async def lookup(self, parent_inode, name, ctx):
    if name not in self.entries:
        raise pyfuse3.FUSEError(errno.ENOENT)

Premature Inode Deletion

❌ Wrong

async def unlink(self, parent_inode, name, ctx):
    inode = self._find_entry(parent_inode, name)
    del self.inodes[inode]  # Kernel may still reference it!

✅ Correct

async def unlink(self, parent_inode, name, ctx):
    inode = self._find_entry(parent_inode, name)
    self.inodes[inode]['nlink'] -= 1
    # Deleted in forget() when safe

Blocking Operations

❌ Wrong

async def read(self, fh, offset, size):
    time.sleep(1)  # Blocks worker task!
    return self.data[offset:offset + size]

✅ Correct

async def read(self, fh, offset, size):
    await trio.sleep(1)  # Yields to other tasks
    return self.data[offset:offset + size]

See Also

  • Error Handling Guide
  • Common Patterns