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Re: Only root can write on USB disk

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On Fri, May 05, 2017 at 09:17:51AM +0000, Curt wrote:
> On 2017-05-02, Greg Wooledge <wooledg@eeg.ccf.org> wrote:
> > On Tue, May 02, 2017 at 07:16:57PM +0430, Mostafa Shahverdy wrote:
> >> I have a very annoying problem. I can't write to my usb drives (fat32,
> >> ntfs, etc.) without root permissions. How can I fix this?
> >
> > Mount the file system with "-o uid=youruser" to have the files presented
> > by the kernel as being "owned" by that user.
> >
> >
> 
> I don't understand that advice entirely.
> 
> Isn't there a difference between mounting the device as a regular user
> and writing to the device as a regular user (which you might be
> prevented from doing if the filesystem had root-only write permissions,
> thus Brian's ls -l suggestion to eliminate that possibility)?

There is a difference. The "-o=foo" advice is betting on the file system
being one without ownership info (i.e. a lower life form ;-)

Once mounted, the operating system just "assumes" some ownership and
permission info. The "user=" and "group=" options give you some say
in it.

The option "user" on the fstab just allows a regular user to activate
a mount according to said entry (however perms & ownership of the "end
result" might look like).

The two things are (somewhat) orthogonal (if I understood your question
correctly).

cheers
- -- t
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Only root can write on USB disk Mostafa Shahverdy <mostafa@mostafa.info> - 2017-05-02 16:50 +0200
  Re: Only root can write on USB disk Greg Wooledge <wooledg@eeg.ccf.org> - 2017-05-02 18:10 +0200
    Re: Only root can write on USB disk Mostafa Shahverdy <mostafa@mostafa.info> - 2017-05-04 14:00 +0200
    Re: Only root can write on USB disk Curt <curty@free.fr> - 2017-05-05 11:20 +0200
      Re: Only root can write on USB disk <tomas@tuxteam.de> - 2017-05-05 11:40 +0200
        Re: Only root can write on USB disk Curt <curty@free.fr> - 2017-05-05 13:00 +0200
          Re: Only root can write on USB disk <tomas@tuxteam.de> - 2017-05-05 13:40 +0200
  Re: Only root can write on USB disk Mostafa Shahverdy <mostafa@mostafa.info> - 2017-05-04 17:30 +0200
    Re: Only root can write on USB disk Greg Wooledge <wooledg@eeg.ccf.org> - 2017-05-04 18:20 +0200
    Re: Only root can write on USB disk Lisi Reisz <lisi.reisz@gmail.com> - 2017-05-04 18:20 +0200
    Re: Only root can write on USB disk Brian <ad44@cityscape.co.uk> - 2017-05-04 20:10 +0200
    Re: Only root can write on USB disk Pascal Hambourg <pascal@plouf.fr.eu.org> - 2017-05-04 20:30 +0200
  Re: Only root can write on USB disk Stefan Monnier <monnier@iro.umontreal.ca> - 2017-05-05 15:00 +0200

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