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

[Allan McRae]

On 14/08/10 15:28, Pierre Schmitz wrote:
> 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
>

Umm..  has anyone?   I am fairly certain that the mount command is wrong.

+  [ -e "${working_dir}/dev/shm" ] || mkdir "${working_dir}/dev/shm"
+  mount -t tmpfs shm /dev/shm "${working_dir}/dev/shm"

Should be:
mount -t tmpfs shm "${working_dir}/dev/shm"


+  [ -e "${working_dir}/dev/pts" ] || mkdir "${working_dir}/dev/pts"
+  mount -t devpts devpts /dev/pts "${working_dir}/dev/pts"

Delete /dev/pts here too.

Allan