[Bug 2152057] Re: chmod -R: cannot access ...: Permission denied when gnuchmod gives Read-only file system

[Daniel Tang]

Reported upstream: https://github.com/uutils/coreutils/issues/12196

** Bug watch added: github.com/uutils/coreutils/issues #12196
   https://github.com/uutils/coreutils/issues/12196

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Title:
  chmod -R: cannot access ...: Permission denied when gnuchmod gives
  Read-only file system

Status in rust-coreutils package in Ubuntu:
  New

Bug description:
  At https://askubuntu.com/q/1566581/1004020 , with ReadonlyRoot
  enabled, I tried

  # chmod -R ugo+rX /lib/python3/dist-packages/
  chmod: cannot access '/lib/python3/dist-packages/Onboard/__pycache__/OnboardGtk.pypy311.pyc': Permission denied
  # chmod -R ugo+rX /lib/python3/dist-packages/Onboard/__pycache__/OnboardGtk.pypy311.pyc
  # # See there's no error

  It's similar for other subdirectories. Whereas with GNU coreutils:

  root at daniel-desktop3:/lib/python3/dist-packages# chmod -R ugo+rX /lib/python3/dist-packages/zstandard
  chmod: cannot access '/lib/python3/dist-packages/zstandard/__pycache__/__init__.pypy311.pyc': Permission denied
  root at daniel-desktop3:/lib/python3/dist-packages# gnuchmod -R ugo+rX /lib/python3/dist-packages/zstandard
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/py.typed': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/_cffi.cpython-314-x86_64-linux-gnu.so': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/backend_cffi.py': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/__init__.py': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/backend_c.cpython-314-x86_64-linux-gnu.so': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/__init__.pyi': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/__pycache__': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/__pycache__/backend_cffi.cpython-314.pyc': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/__pycache__/__init__.cpython-314.pyc': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/__pycache__/backend_cffi.pypy311.pyc': Read-only file system
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/__pycache__/__init__.pypy311.pyc': Read-only file system
  root at daniel-desktop3:/lib/python3/dist-packages# gnuchmod -R ugo+rX /lib/python3/dist-packages/zstandard/py.typed
  gnuchmod: changing permissions of '/lib/python3/dist-packages/zstandard/py.typed': Read-only file system

  The error message should be "Read-only file system" not "Permission
  denied".

  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: rust-coreutils 0.8.0-0ubuntu3
  ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
  Uname: Linux 7.0.0-15-generic x86_64
  ApportVersion: 2.34.0-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: KDE
  Date: Fri May  8 12:25:55 2026
  InstallationDate: Installed on 2022-11-05 (1281 days ago)
  InstallationMedia: Ubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221020)
  SourcePackage: rust-coreutils
  UpgradeStatus: Upgraded to resolute on 2026-04-24 (15 days ago)

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