| 219 | |
| 220 | |
| 221 | def can_xattr(): |
| 222 | import tempfile |
| 223 | global _can_xattr |
| 224 | if _can_xattr is not None: |
| 225 | return _can_xattr |
| 226 | if not hasattr(os, "setxattr"): |
| 227 | can = False |
| 228 | else: |
| 229 | import platform |
| 230 | tmp_dir = tempfile.mkdtemp() |
| 231 | tmp_fp, tmp_name = tempfile.mkstemp(dir=tmp_dir) |
| 232 | try: |
| 233 | with open(TESTFN, "wb") as fp: |
| 234 | try: |
| 235 | # TESTFN & tempfile may use different file systems with |
| 236 | # different capabilities |
| 237 | os.setxattr(tmp_fp, b"user.test", b"") |
| 238 | os.setxattr(tmp_name, b"trusted.foo", b"42") |
| 239 | os.setxattr(fp.fileno(), b"user.test", b"") |
| 240 | # Kernels < 2.6.39 don't respect setxattr flags. |
| 241 | kernel_version = platform.release() |
| 242 | m = re.match(r"2.6.(\d{1,2})", kernel_version) |
| 243 | can = m is None or int(m.group(1)) >= 39 |
| 244 | except OSError: |
| 245 | can = False |
| 246 | finally: |
| 247 | unlink(TESTFN) |
| 248 | unlink(tmp_name) |
| 249 | rmdir(tmp_dir) |
| 250 | _can_xattr = can |
| 251 | return can |
| 252 | |
| 253 | |
| 254 | def skip_unless_xattr(test): |