compiling in shared mount, can't execute file (mac/ubuntu)

Discussions related to using VirtualBox on Mac OS X hosts.

compiling in shared mount, can't execute file (mac/ubuntu)

Postby wfpunch » 14. Jan 2009, 21:57

I am running Leopard 10.5.6, VB 2.1.0 and Ubuntu 8.10. The Mac is the host, Ubuntu the guest.

I have created a shared folder under vbox for my home mac directory. I have modified my /etc/fstab in Ubuntu to have the following line

billMac /mnt/billMac vboxsf defaults,rw,exec,uid=1000,gid=1000 0 0

On boot, I get the mount. I can read and write. Problem is compiling in the share folder. If I change to /mnt/billMac and compile a file (gcc), it compiles, I get an "executable" but it lacks execute privileges. Furthermore, I am not permitted to modify the execute bit of the file.

Clearly I asked for execute privileges in fstab, but didn't get them. Anyone know why?

>>>bill<<<
wfpunch
 
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Postby wfpunch » 22. Jan 2009, 15:18

Bump
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Postby TerryE » 22. Jan 2009, 18:54

Bill, sorry for missing this one first time around. I've just answered this same Q on another topic. The answers are usually out there if you look for them. The problem is that the fstab is processed early in the boot sequence before the vboxsf device driver is loaded. On Linux you stick the mount in your rc.local. I don't know if this is exactly the same file on MacOS, but since MacOS in now a *nix derivative there will be a similar hook file to put system-local startup commands into the boot sequence.
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Postby TerryE » 22. Jan 2009, 19:06

And also have a look the Forum Posting Guide for help in framing Qs. Please don't cross post. I've deleted the second copy of your post.
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Postby wfpunch » 22. Jan 2009, 19:49

Thanks for the reply. Shouldn't of cross-posted but I wasn't getting any feedback.

Anyway, I but the following in rc.local on the ubuntu guest

mount -t vboxsf -o defaults,uid=1000,gid=1000,rw,exec billMac /mnt/billMac

Does do the mount, but still no exec privs inside. I'll keep looking but if it is something obvious (I did look around a bit) I'd appreciate knowing. Thanks again.
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Postby TerryE » 22. Jan 2009, 20:53

Do a mount.vboxsf --help to see the syntax. You may need to set dmode and fmode.

The reason for deprecating cross posting is that to answer Qs here (i) you need to understand VBox in depth, (ii) you need to understand the various OSs: Windows, Linux, Solaris and Mac, (iii) Development and Sysadmin skills help. (iv) You need to be willing to put in the hours pro bono. In practice less than 6 of us provide over two-thirds of all answers, and another 50 or so reasonably active posters the other one third. All that cross posting does is to piss off the 6 :-)
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TerryE
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