- # This mess below finds the best xattr tool for the job and creates a
- # "write_xattr" function.
- try:
- # try the pyxattr module...
- import xattr
- def write_xattr(path, key, value):
- return xattr.setxattr(path, key, value)
-
- except ImportError:
-
- if os.name == 'posix':
- def which(bin):
- for dir in os.environ["PATH"].split(":"):
- path = os.path.join(dir, bin)
- if os.path.exists(path):
- return path
-
- user_has_setfattr = which("setfattr")
- user_has_xattr = which("xattr")
-
- if user_has_setfattr or user_has_xattr:
-
- def write_xattr(path, key, value):
- import errno
- potential_errors = {
- # setfattr: /tmp/blah: Operation not supported
- "Operation not supported": errno.EOPNOTSUPP,
- # setfattr: ~/blah: No such file or directory
- # xattr: No such file: ~/blah
- "No such file": errno.ENOENT,
- }
-
- if user_has_setfattr:
- cmd = ['setfattr', '-n', key, '-v', value, path]
- elif user_has_xattr:
- cmd = ['xattr', '-w', key, value, path]
-
- try:
- subprocess.check_output(cmd, stderr=subprocess.STDOUT)
- except subprocess.CalledProcessError as e:
- errorstr = e.output.strip().decode()
- for potential_errorstr, potential_errno in potential_errors.items():
- if errorstr.find(potential_errorstr) > -1:
- e = OSError(potential_errno, potential_errorstr)
- e.__cause__ = None
- raise e
- raise # Reraise unhandled error
-
- else:
- # On Unix, and can't find pyxattr, setfattr, or xattr.
- if sys.platform.startswith('linux'):
- self._downloader.report_error("Couldn't find a tool to set the xattrs. Install either the python 'pyxattr' or 'xattr' modules, or the GNU 'attr' package (which contains the 'setfattr' tool).")
- elif sys.platform == 'darwin':
- self._downloader.report_error("Couldn't find a tool to set the xattrs. Install either the python 'xattr' module, or the 'xattr' binary.")
- else:
- # Write xattrs to NTFS Alternate Data Streams: http://en.wikipedia.org/wiki/NTFS#Alternate_data_streams_.28ADS.29
- def write_xattr(path, key, value):
- assert(key.find(":") < 0)
- assert(path.find(":") < 0)
- assert(os.path.exists(path))
-
- ads_fn = path + ":" + key
- with open(ads_fn, "w") as f:
- f.write(value)
-