how to make the cdrom executeable ?

zantac · 04-30-2007, 03:52 AM

My problem is that my cdrom only mounts read-only. This is a problem since I want to run a install-script on the cd.
How can I make the script executeable ?

/Tobias

mount: block device /dev/cdrom is write-protected, mounting read-only
dvorac@dvorac:~$ cd /cdrom
dvorac@dvorac:/cdrom$ ls
00000000.016 00000001.TMP InstallForMacOSX.app setup.exe win32 00000000.256 autorun.inf install_unix.sh unix
dvorac@dvorac:/cdrom$ sudo ./install_unix.sh
sudo: unable to execute ./install_unix.sh: Permission denied

slakmagik · 04-30-2007, 03:54 AM

not familiar with sudo, but 'sudo sh ./install_unix.sh' should do - CD-ROMs are kind of necessarily read-only.

zantac · 05-03-2007, 05:02 AM

Sure, of course CDROMS is read-only. But it would be possible to run the script I think.
No one got a clue ?

tredegar · 05-03-2007, 07:16 AM

Two questions:
1] Is the script executable?
2] Is the CDROM mounted with the noexec option?

pwc101 · 05-03-2007, 08:08 AM

Why not just copy the contents of the CD to a temporary directory and run it from there? Once it's on your hard drive, you can do what you like with the permissions.

Check the noexec option on the mount command first though.

slakmagik · 05-03-2007, 08:37 AM

Quote:

but 'sudo sh ./install_unix.sh' should do

Code:

[root@lightsaber /root]# mount -o noexec,ro /dev/hda8 /mnt/hda8/

[ j@lightsaber ][ 05-03 09:33 ][ ~ ]
:mount | grep hda8
/dev/hda8 on /mnt/hda8 type reiserfs (ro,noexec)

[ j@lightsaber ][ 05-03 09:33 ][ ~ ]
:/mnt/hda8/home/j/system/sbin/ce foo
bash: /mnt/hda8/home/j/system/sbin/ce: /bin/sh: bad interpreter: Permission denied

[ j@lightsaber ][ 05-03 09:34 ][ ~ ]
:sh /mnt/hda8/home/j/system/sbin/ce foo

[ j@lightsaber ][ 05-03 09:34 ][ ~ ]
:echo $?
0

[root@lightsaber /root]# umount /mnt/hda8/
[root@lightsaber /root]# mount -o noexec /dev/hda8 /mnt/hda8/
[root@lightsaber /root]# chmod 600 /mnt/hda8/home/j/system/sbin/ce

[ j@lightsaber ][ 05-03 09:34 ][ ~ ]
:/mnt/hda8/home/j/system/sbin/ce foo
bash: /mnt/hda8/home/j/system/sbin/ce: Permission denied

[ j@lightsaber ][ 05-03 09:36 ][ ~ ]
:sh /mnt/hda8/home/j/system/sbin/ce foo

[ j@lightsaber ][ 05-03 09:36 ][ ~ ]
:echo $?
0

tredegar · 05-03-2007, 09:26 AM

Quote:

but sudo sh ./install_unix.sh should do

Neat. Thank you.
And you've shown that it doesn't matter about the noexec option (or even if the script is not marked as executable - I just tried it myself).

So, did you try this zantac?

zantac · 05-03-2007, 11:54 AM

Thanks for the response!
I solved the issue by adding the exec option in fstab. By some reason the device was mounted as noexec even without the noexec option in fstab.