{"record":{"id":"5da0cc08ea7e6950","repo":"ytdl-org/youtube-dl","slug":"couldn-t-find-a-tool-to-set-the-xattrs-install-ei","errorCode":null,"errorMessage":"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).","messagePattern":"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\\)\\.","errorType":"exception","errorClass":"XAttrUnavailableError","httpStatus":null,"severity":"warning","filePath":"youtube_dl/utils.py","lineNumber":6238,"sourceCode":"\n                cmd = ([encodeFilename(executable, True)]\n                       + [encodeArgument(o) for o in opts]\n                       + [encodeFilename(path, True)])\n\n                try:\n                    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),","sourceCodeStart":6220,"sourceCodeEnd":6256,"githubUrl":"https://github.com/ytdl-org/youtube-dl/blob/956b8c585591b401a543e409accb163eeaaa1193/youtube_dl/utils.py#L6220-L6256","documentation":"Raised as XAttrUnavailableError by write_xattr in youtube_dl.utils on Linux when no xattr backend could be found: the pyxattr/xattr python modules are not importable and the setfattr CLI tool is absent from PATH. It fires only on sys.platform starting with 'linux'; the tool then cannot store metadata (like filesize) in extended attributes.","triggerScenarios":"Running with --xattr-set-filesize (or calling write_xattr) on Linux where 'import xattr' raises ImportError and either setfattr is not in PATH or the earlier CLI branch could not run. The final else branch raises the Linux-specific install message.","commonSituations":"Minimal Docker containers or slim images without the attr package; CI runners; systems where the filesystem does not support xattrs and the package was never installed; users assuming xattr support is built in.","solutions":["Install the GNU attr package (Debian/Ubuntu: apt-get install attr; Fedora: dnf install attr) which provides setfattr.","Or install a python backend: pip install xattr (or pyxattr>=0.5.0).","If xattr metadata is optional, remove --xattr-set-filesize from your command/config file (~/.config/youtube-dl/config).","For containers, add the package to the image rather than relying on the host."],"exampleFix":"# before\nyoutube-dl --xattr-set-filesize URL  # XAttrUnavailableError: Couldn't find a tool to set the xattrs...\n\n# after\napt-get install -y attr && 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('setfattr') or shutil.which('xattr'))\n\n# on linux, 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)  # non-fatal, download already succeeded","preventionTips":["Install the attr package (setfattr) or pip install xattr in base images that use --xattr-set-filesize.","Probe for a backend at startup (code above) and disable the flag when absent.","Never treat xattr failure as fatal — wrap write_xattr calls in except XAttrUnavailableError."],"tags":["xattr","metadata","environment","linux","missing-dependency"],"backgroundTag":null,"analyzedSha":"956b8c585591b401a543e409accb163eeaaa1193","analyzedAt":"2026-08-14T18:59:47.863Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}