Home / ubuntu / Questions / 1042699
Accepted
frepie
Asked: 2018-06-02 08:38:46 +0800 CST

CIFS mount - fstab versus manual - loss of writing privileges

  • 772

I have a samba shares drive that is mounted at boot that works as I intend. Here is the fstab file:

//192.168.1.2/ext4tb /mnt/ext4tb cifs ,credentials=/home/frepie/.smbcredentials,iocharset=utf8,vers=1.0,sec=ntlm,user  0  0

When this works normally, I have total read,write and execute privileges on that share

Sometimes, for reasons that I ignore, that shared drive is not mounted at boot. Trying to resolve the issue without rebooting, I used the command

sudo mount.cifs //192.168.1.2/ext4tb /mnt/ext4tb

And the command requests the root password on the samba server

Password for root@//192.168.1.2/ext4tb:  ********

The problem is the when doing so, I don't have the write privileges that I have when the mount at boot works normally.

$ mv /home/frepie/Music/Dark\ Latin\ Groove\ -\ La\ Quiero\ A\ Morir /mnt/ext4tb/media/Audio/
mv: cannot create regular file '/mnt/ext4tb/media/Audio/Dark Latin Groove - La Quiero A Morir': Permission denied

Somehow, I am not granted the same privileges when the mount is performed by fstab at boot.

fstab permissions samba mount cifs

3 Answers

  1. Best Answer

    As far as I know, the behavior that you're looking for (i.e. consulting the /etc/fstab file, and applying the options found there) only applies if you call mount directly, rather than one of the "helper" commands like mount.cifs, and only if you specify EITHER the device or the mountpoint. From man mount:

       If only the directory or the device is given, for example:

          mount /dir

   then  mount looks for a mountpoint (and if not found then for a device)
   in the /etc/fstab file.  It's possible to use the --target or  --source
   options  to avoid ambivalent interpretation of the given argument.  For
   example:

          mount --target /mountpoint

    So replace

    sudo mount.cifs //192.168.1.2/ext4tb /mnt/ext4tb

    by either

    sudo mount /mnt/ext4tb

    or

    sudo mount //192.168.1.2/ext4tb
    • 1

  2. Hi i do exactly the same : smb shares declared in /etc/fstab except that is do not automount, and i stored credential files in encrypted folders. I do not experience no issue.

    Here is an extract of /etc/fstab on 18.04

    //192.168.1.100/video  /media/user/Video  cifs  noauto,user,_netdev,sec=ntlm,credentials=/home/user/Crypt/credentials,uid=1000,gid=1000,vers=1.0  0 0

    See uid=1000,gid=1000

    You may add thoses option : explicitly specify grouid an userid of your Ubuntu user

    With the noauto option i like, shares are mounted when I click to open them from nautilus file manager.

    Using _netdev option means that this mount needs a network

    • 0

  3. Seems the answer is to simply mount the drive without cifs i.e.

    sudo mount /mnt/ext4tb
    • 0