[arch-dev-public] /dev/shm permissions and building in chroot

[Pierre Schmitz]

On Sat, 14 Aug 2010 13:51:30 +1000, Allan McRae <allan at archlinux.org>
wrote:
> Hi,
> 
> I have been tracking down a python3 bug and it turns out to be caused
> by our chroot building.  Essentially the permissions of /dev/shm are
> different in the chroot than on the system:
> 
> allan at mugen /home/arch/chroot/stable-i686/copy/dev
>> ls -ld shm
> drwxr-xr-x 2 root root 40 Jul 12 15:16 shm
> 
> allan at mugen /dev
>> ls -ld shm
> drwxrwxrwt 2 root root 40 Aug 14 10:23 shm
> 
> So when configure scripts try to test for POSIX semaphores by writing
> in that directory, they fail.
> 
> Looking at the relevant line in mkarchroot:
> mount -o bind /dev "${working_dir}/dev"
> 
> Doing that manually show the same issue.   Should we add
> 
> chmod 1777 "${working_dir}/dev/shm"
> 
> after the mount?  It fixes my issue but feels hackish.  Any other
> suggestions?
> 
> Allan

Did you try this patch:
http://projects.archlinux.org/devtools.git/commit/?id=f7b67c25ff4a3f1f290c29a70500292344c59a1e

-- 
Pierre Schmitz, https://users.archlinux.de/~pierre