Re: parted is ALMOST suitable

[<tomas@tuxteam.de>]

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On Mon, Nov 07, 2016 at 08:02:30AM -0600, David Wright wrote:
> On Mon 07 Nov 2016 at 13:47:27 (+0100), tomas@tuxteam.de wrote:
> > On Mon, Nov 07, 2016 at 06:11:50AM -0600, Richard Owlett wrote:
> > > I need to identify file system on all partitions of my hard drive
> > > whether mounted or not.
> > >     parted /dev/sda print | grep ext | grep -v exte
> > > reports the desired information [partitions formatted ext?] in a
> > > convenient format.
> > > *HOWEVER* parted requires root privileges. That is not acceptable.
> > > Suggestions?
> > 
> > It's not parted. It's the partitions themselves (or more accurately,
> > the devices via which your operating system makes the partitions
> > available to user space). By default (and there are some reasons
> > for it) they're not readable by everyone. They are writable by
> > even less. On my box, for example:
> > 
> >   tomas@rasputin:~$ ls -al /dev/sd*
> >   brw-rw---- 1 root disk 8, 0 Nov  7 09:06 /dev/sda
> >   brw-rw---- 1 root disk 8, 1 Nov  7 09:06 /dev/sda1
> >   brw-rw---- 1 root disk 8, 2 Nov  7 09:06 /dev/sda2
> >   brw-rw---- 1 root disk 8, 5 Nov  7 09:06 /dev/sda5
> > 
> > So you'd have to be associated to the "disk" group to read those
> > things and you'd have to *be* root to write.
> 
> Are you sure? I read that as group disk having read *and* write access.

Uh -- yes, you are right, of course.

> Obviously the OP seems unworried about read-access by himself or
> anyone else, so world-readable on pretty much everything might
> be appropriate.
> 
> Reading anything about a filesystem without going through the
> normal access methods would appear to circumvent any file
> protection scheme within it, so it's no surprise to me that
> all the suggestions with lsblk etc have failed.

Exactly.

regards
- -- tomás
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