pybtrfs 0.5.2

Static Python bindings for btrfs ioctl operations

pybtrfs

Native Python bindings for btrfs — create filesystems, manage subvolumes and snapshots, mount and unmount. No shell commands, no subprocess, no runtime dependencies beyond libc.

Built as C extensions directly from vendored btrfs-progs source. pip install . is all you need.

Why not the existing btrfs package?

The btrfs package on PyPI requires libbtrfsutil installed as a system library. That means distro packages, broken virtualenvs, and pain on minimal containers or custom builds.

pybtrfs statically compiles everything from vendored source — the only build-time requirement is a C compiler and Python headers. The resulting .so files link only to libc.

Requirements

• Linux with btrfs support
• Python 3.12+
• GCC and Python headers for building (apt install python3-dev)

Installation

pip install .

Or with make:

make build      # compile extensions
make install    # pip install .

Usage

Subvolumes and snapshots

import pybtrfs

# Create a subvolume
pybtrfs.create_subvolume("/mnt/data/project")

# Snapshot before a risky operation
pybtrfs.create_snapshot("/mnt/data/project", "/mnt/data/project-snap",
                        read_only=True)

# Check snapshot relationship
src = pybtrfs.subvolume_info("/mnt/data/project")
snap = pybtrfs.subvolume_info("/mnt/data/project-snap")
assert snap.parent_uuid == src.uuid

# Clean up
pybtrfs.delete_subvolume("/mnt/data/project-snap")

List all subvolumes

with pybtrfs.SubvolumeIterator("/mnt/data", info=True) as it:
    for path, info in it:
        print(f"{path} (id={info.id}, gen={info.generation})")

Create a filesystem

from pybtrfs import mkfs, CsumType, RaidProfile

# Single device
result = mkfs("/dev/sdb", label="data", force=True)
print(result["uuid"])

# RAID1 mirror with xxhash checksums
result = mkfs("/dev/sdb", "/dev/sdc",
              data_profile=RaidProfile.RAID1,
              metadata_profile=RaidProfile.RAID1,
              csum_type=CsumType.XXHASH,
              force=True)

Mount and unmount

from pybtrfs import mount, umount, mount_data, MountFlags

mount("/dev/sdb", "/mnt/data",
      data=mount_data(compress="zstd", space_cache="v2"))

mount("/dev/sdb", "/mnt/readonly", flags=MountFlags.RDONLY)

umount("/mnt/data")

Error handling

import pybtrfs

try:
    pybtrfs.sync("/not/btrfs")
except pybtrfs.BtrfsUtilError as e:
    print(e.btrfsutil_errno)  # e.g. BtrfsUtilErrno.NOT_BTRFS
    print(e.errno)            # OS errno

API reference

The package ships with .pyi stubs — full signatures and docstrings are available via help(pybtrfs), help(pybtrfs.mkfs), help(pybtrfs.mount), and your IDE's autocomplete.

Testing

Tests require root and a mounted btrfs filesystem:

truncate -s 1G /tmp/btrfs.img
mkfs.btrfs /tmp/btrfs.img
mkdir -p ~/btrfs
mount /tmp/btrfs.img ~/btrfs

sudo BTRFS=~/btrfs PYTHONPATH=. pytest -v

License

GPL-2.0 — see LICENSE.

This project statically compiles code from btrfs-progs (GPL-2.0), including libbtrfsutil (LGPL-2.1) and substantial portions of the core btrfs-progs codebase (kernel-shared, mkfs, crypto, etc.) which are GPL-2.0. Since the resulting binaries are derivative works of GPL-2.0 code, this project is licensed under GPL-2.0 to comply with the upstream license terms.