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Old 08-04-2011, 10:05 AM   #1
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Registered: Aug 2011
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Mount ISO image RW

this is an old question, and the present answers are clear
and reasonable enough: namely that an ISO image is essentially
a read-only format, and as such does not require, or allow,
to be writable.

(Still, today that enormous storage facilities are available,
one may like to keep one's disks around like ISO images, and never
actually burn them to physical media, only modify them)

But my question is different: I am trying to mount a DVD on my
Linux (Fedora 12) and I want to see its contents from my old PC
via Samba. (Attention: _see_, not _modify_ content)

I do this by
1) mount -o loop my_old_photo.iso /mnt/diskimage
2) declare the latter in a [data]section of smb.conf

This does not work at all: SELinux requires at all costs me to do

chcon -R -t samba_share_t /mnt/diskimage

and this, although not strictly writing to the ISO, formally appears
like a modification. I am informed that:

[root@myBox ~]# chcon -t samba_share_con /mnt/diskimage
chcon: failed to change context of `/mnt/diskimage' to `system_ubject_r:samba_share_con:s0': Read-only file system

Looks like a rather silly requirement, either from SELinux or from mount,
given that the "context" is not really part of the filesystem.
For the record,

[root@myBox ~]# ls -ldZ /mnt/diskimage/
dr-xr-xr-x. root root system_ubject_r:iso9660_t:s0 /mnt/diskimage/

...and I am stuck.
Unless, that is, I copy/unpack all from /mnt/diskimage to _another_
directory, and export that one instead.

...ideas anybody? Thanks in advance!
Old 08-04-2011, 12:18 PM   #2
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Hi, welcome to LQ!

Have you tried applying the chcon BEFORE you actually mount
a device to that mount-point?

Old 08-04-2011, 03:37 PM   #3
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Thread: Mount ISO image RW

Hi, thanks for the answer!
I did try this, and the chcon then works.
But mounting the ISO image obliterates this move. When I try
to access the mounted samba share (from the same machine,
using smbclient) I do see the directory but "ls" fails with
(I am away from the machines now, tomorrow I will post the exact message)
Old 08-04-2011, 08:42 PM   #4
John VV
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But my question is different: I am trying to mount a DVD on my
Linux (Fedora 12)
you are aware that fedora 12 is past it's End Of Life and there is NO support for it any longer and has had NO SUPPORT for 8 months now

install the current fedora 15


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