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- """
- btrfs-snap.py: source target newname
- creates a exactly named snapshots and bails out if they exist
- """
- import argparse
- import fcntl
- import os
- import sys
- import cffi
- ffi = cffi.FFI()
- ffi.cdef("""
- #define BTRFS_IOC_SNAP_CREATE_V2 ...
- struct btrfs_ioctl_vol_args_v2 {
- int64_t fd;
- char name[];
- ...;
- };
- """)
- ffi.set_source("_btrfs_cffi", "#include <btrfs/ioctl.h>")
- ffi.compile()
- # ____________________________________________________________
- from _btrfs_cffi import ffi, lib
- parser = argparse.ArgumentParser(usage=__doc__.strip())
- parser.add_argument('source', help='source subvolume')
- parser.add_argument('target', help='target directory')
- parser.add_argument('newname', help='name of the new snapshot')
- opts = parser.parse_args()
- source = os.open(opts.source, os.O_DIRECTORY)
- target = os.open(opts.target, os.O_DIRECTORY)
- args = ffi.new('struct btrfs_ioctl_vol_args_v2 *')
- args.name = opts.newname
- args.fd = source
- args_buffer = ffi.buffer(args)
- try:
- fcntl.ioctl(target, lib.BTRFS_IOC_SNAP_CREATE_V2, args_buffer)
- except IOError as e:
- print e
- sys.exit(1)
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