[Bug 2055226] Re: mount option `users` blocks ntfs to mount

[UlfZibis]

Both options and a third exist.

Extract from man mount in section FILESYSTEM-INDEPENDENT MOUNT OPTIONS:

       user
           Allow an ordinary user to mount the filesystem. The name of the
           mounting user is written to the mtab file (or to the private
           libmount file in /run/mount on systems without a regular mtab) so
           that this same user can unmount the filesystem again. This option
           implies the options noexec, nosuid, and nodev (unless overridden by
           subsequent options, as in the option line user,exec,dev,suid).

       nouser
           Forbid an ordinary user to mount the filesystem. This is the
           default; it does not imply any other options.

       users
           Allow any user to mount and to unmount the filesystem, even when
           some other ordinary user mounted it. This option implies the
           options noexec, nosuid, and nodev (unless overridden by subsequent
           options, as in the option line users,exec,dev,suid).

gio mount is the command line variant to simulate a mount by a GUI tool like Nautilus, just used to get the error message.
gio invokes udiskctl under the hood.

** Changed in: util-linux (Ubuntu)
       Status: Incomplete => New

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Title:
  mount option `users` blocks ntfs to mount

Status in util-linux package in Ubuntu:
  New

Bug description:
  /etc/fstab:
  # /media/Sicherung was on /dev/sda7 during installation
  UUID=2510AA16624BB80C /media/Sicherung ntfs defaults,users,noauto,windows_names,hide_dot_files 0 0

  $ gio mount -d /dev/sda7
  gio: /dev/sda7: Error mounting system-managed device /dev/sda7: Unknown error when mounting /media/Sicherung

  $ udisksctl mount -b /dev/sda7
  Error mounting /dev/sda7: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error mounting system-managed device /dev/sda7: Unknown error when mounting /media/Sicherung

  $ journalctl -b 0 -u udisks2.service
  Feb 27 23:48:51 T500 udisksd[10478]: Error opening read-only '/dev/sda7': Keine Berechtigung
  Feb 27 23:48:51 T500 udisksd[10478]: Failed to mount '/dev/sda7': Keine Berechtigung
  Feb 27 23:48:51 T500 udisksd[10478]: Please check '/dev/sda7' and the ntfs-3g binary permissions,
  Feb 27 23:48:51 T500 udisksd[10478]: and the mounting user ID. More explanation is provided at
  Feb 27 23:48:51 T500 udisksd[10478]: https://github.com/tuxera/ntfs-3g/wiki/NTFS-3G-FAQ

  This worked fine until Ubuntu 20.04, but since 22.04 I have these
  errors.

  Additionally, mount option `users` does not, what it should do:

  $ LC_ALL=C mount /media/Sicherung
  Error opening read-only '/dev/sda7': Permission denied
  Failed to mount '/dev/sda7': Permission denied
  Please check '/dev/sda7' and the ntfs-3g binary permissions,
  and the mounting user ID. More explanation is provided at
  https://github.com/tuxera/ntfs-3g/wiki/NTFS-3G-FAQ

  When removing `users` from /etc/fstab, it works fine:

  $ gio mount -d /dev/sda7
  $ LC_ALL=C journalctl -b 0 -u udisks2.service
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Version 2021.8.22 integrated FUSE 28
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Mounted /dev/sda7 (Read-Write, label "Sicherung", NTFS 3.1)
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Cmdline options: rw,windows_names,hide_dot_files
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Mount options: allow_other,nonempty,relatime,rw,fsname=/dev/sda7,blkdev,blksize=4096
  Feb 28 00:05:31 T500 ntfs-3g[10977]: Ownership and permissions disabled, configuration type 7
  Feb 28 00:05:31 T500 udisksd[583]: Mounted /dev/sda7 (system) at /media/Sicherung on behalf of uid 1000

  So it seems, that option `users` virtually effectuates the opposite,
  than it is supposed to do.

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