{"record":{"id":"5c18fc564ff44e19","repo":"ytdl-org/youtube-dl","slug":"couldn-t-find-a-tool-to-set-the-xattrs-install-ei-5c18fc","errorCode":null,"errorMessage":"Couldn't find a tool to set the xattrs. Install either the python 'xattr' module, or the 'xattr' binary.","messagePattern":"Couldn't find a tool to set the xattrs\\. Install either the python 'xattr' module, or the 'xattr' binary\\.","errorType":"exception","errorClass":"XAttrUnavailableError","httpStatus":null,"severity":"warning","filePath":"youtube_dl/utils.py","lineNumber":6244,"sourceCode":"                    p = subprocess.Popen(\n                        cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)\n                except EnvironmentError as e:\n                    raise XAttrMetadataError(e.errno, e.strerror)\n                stdout, stderr = process_communicate_or_kill(p)\n                stderr = stderr.decode('utf-8', 'replace')\n                if p.returncode != 0:\n                    raise XAttrMetadataError(p.returncode, stderr)\n\n            else:\n                # On Unix, and can't find pyxattr, setfattr, or xattr.\n                if sys.platform.startswith('linux'):\n                    raise XAttrUnavailableError(\n                        \"Couldn't find a tool to set the xattrs. \"\n                        \"Install either the python 'pyxattr' or 'xattr' \"\n                        \"modules, or the GNU 'attr' package \"\n                        \"(which contains the 'setfattr' tool).\")\n                else:\n                    raise XAttrUnavailableError(\n                        \"Couldn't find a tool to set the xattrs. \"\n                        \"Install either the python 'xattr' module, \"\n                        \"or the 'xattr' binary.\")\n\n\ndef random_birthday(year_field, month_field, day_field):\n    start_date = datetime.date(1950, 1, 1)\n    end_date = datetime.date(1995, 12, 31)\n    offset = random.randint(0, (end_date - start_date).days)\n    random_date = start_date + datetime.timedelta(offset)\n    return {\n        year_field: str(random_date.year),\n        month_field: str(random_date.month),\n        day_field: str(random_date.day),\n    }\n\n\ndef clean_podcast_url(url):","sourceCodeStart":6226,"sourceCodeEnd":6262,"githubUrl":"https://github.com/ytdl-org/youtube-dl/blob/956b8c585591b401a543e409accb163eeaaa1193/youtube_dl/utils.py#L6226-L6262","documentation":"Raised as XAttrUnavailableError by write_xattr in youtube_dl.utils on a non-Linux Unix platform (e.g. macOS or BSD) when no xattr backend is available: neither the python 'xattr'/'pyxattr' modules are importable nor a usable 'xattr'/'setfattr' CLI binary was found. It is the platform-specific sibling of the Linux message, naming the macOS-appropriate installation options.","triggerScenarios":"Running with --xattr-set-filesize (or calling write_xattr) on macOS/BSD where sys.platform does not start with 'linux', 'import xattr' fails, and the CLI fallbacks are unavailable, reaching the else branch's non-Linux raise.","commonSituations":"macOS with system python where xattr/pip module was never installed; Homebrew python environments without pip xattr; automation scripts assuming the backend exists across platforms.","solutions":["Install the python xattr module: pip install xattr.","Or install a compatible 'xattr' command-line binary (e.g. via Homebrew) and ensure it is on PATH.","If xattr metadata is optional, remove --xattr-set-filesize from the invocation or config file.","Guard the flag per-platform in wrapper scripts so macOS runs skip xattr writes."],"exampleFix":"# before\nyoutube-dl --xattr-set-filesize URL  # on macOS → XAttrUnavailableError: Couldn't find a tool to set the xattrs...\n\n# after\npip install xattr && youtube-dl --xattr-set-filesize URL","handlingStrategy":"try-catch","validationCode":"import shutil, importlib.util, sys\n\ndef xattr_backend_available():\n    if importlib.util.find_spec('xattr'):\n        return True\n    return bool(shutil.which('xattr') or shutil.which('setfattr'))\n\n# on macOS/BSD, gate --xattr-set-filesize on xattr_backend_available()","typeGuard":null,"tryCatchPattern":"from youtube_dl.utils import write_xattr, XAttrUnavailableError\ntry:\n    write_xattr(path, key, value)\nexcept XAttrUnavailableError as e:\n    log.debug('xattr write skipped: %s', e)  # optional metadata; do not fail the job","preventionTips":["On macOS, pip install xattr or brew-install an xattr CLI before enabling --xattr-set-filesize.","Make the flag platform-conditional in wrapper scripts (skip on hosts without a backend).","Catch XAttrUnavailableError around write_xattr so downloads succeed without extended attributes."],"tags":["xattr","metadata","environment","macos","missing-dependency"],"backgroundTag":null,"analyzedSha":"956b8c585591b401a543e409accb163eeaaa1193","analyzedAt":"2026-08-14T18:59:47.863Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}