[Voyage-linux] V0.6 bug?

[Punky Tse]

Hi Fabian,

Thanks. Got it.

Regards,
Punky


Fabian Ruff wrote:
> Hi,
>
> Punky Tse wrote:
>   
>> Thank you for point this out.  I am going to /tmp to be tmpfs mounted,
>> instead of using aufs.  I have seen another thread using aufs will
>> override the base directory settings.
>>     
>
> I've also noticed this bug and tried to give some feedback but my
> response didn't go to the list. Here is my previous post which went
> directly to punkytse at punknix.com:
>
> Fabian wrote:
>   
>> I noticed one issue with /tmp which is also an aufs mount point.
>> When mounted from /etc/init.d/voyage-sync with
>> mount -t aufs -o dirs=/lib/init/rw/tmp:/tmp=ro none /tmp
>> /tmp changes its permissions:
>>
>>     
>>> voyage:/# ls -l |grep tmp
>>> drwxrwxrwt  2 root   root    1024 Oct 26 02:45 tmp
>>> voyage:/# mount -t aufs -o dirs=/lib/init/rw/tmp:/tmp=ro none /tmp
>>> voyage:/# ls -l |grep tmp
>>> drwxr-xr-x  3 root   root      80 Oct 28 10:09 tmp
>>>       
>> It seems that aufs merges the permissions from the two underlaying
>> directories with an bitwise AND operation. With the resulting
>> permissions no non-root owned process can write to /tmp which isn't to
>> good.  ;) 
>>
>> doing
>>     
>>> voyage:/# chmod 777 /lib/init/rw/tmp
>>> voyage:/# chmod o+t /lib/init/rw/tmp
>>>       
>> before the mount command fixes the problem.
>>
>> Maybe the voyage-sync script should adopt the permissons from the
>> SYNC_DIRS when creating there counterparts in /lib/init/rw ?
>>     
>
> I did change the voyage-sync script to something like:
>   
>> for SYNC_DIR in $SYNC_DIRS; do
>> 	[ ! -d $TMPFS_ROOT/$SYNC_DIR ] && mkdir -p $TMPFS_ROOT/$SYNC_DIR
>> +	chmod --reference=/$SYNC_DIR $TMPFS_ROOT/$SYNC_DIR
>> + 	chown --reference=/$SYNC_DIR $TMPFS_ROOT/$SYNC_DIR
>> 	mount -t aufs -o dirs=$TMPFS_ROOT/$SYNC_DIR:$SYNC_DIR=ro none /$SYNC_DIR> /dev/null 2>&1
>> done
>>     
>
> Greetings,
> Fabian
>
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