[Buildroot] [RFC/PATCH] Makefile: guarantee reproducible permissions

[Guido Martínez]

Hi Angelo,

On Wed, Nov 05, 2014 at 04:51:25PM +0100, Angelo Compagnucci wrote:
> Hi Guido,
> 
> > Are you sure? I think rsync is used to copy the sysroot to the staging
> > dir (output/host). The target is then filled with various 'install -m's
> > for each library, so the previous set of permissions wouldn't matter.
> 
> The mono package uses rsync to install some libraries in target, so
> it's an exception.

I think this is not an issue since we're copying them from output/host,
where we now build with a controlled umask. This means that the current
permissions of source files in the BR repo and the umask won't affect
the outcome. I just built mono with an umask of 077 on a repo with
'chmod -R go=' and I think the end result was ok: 644 for most files,
755 for DLLs and 755 for directories.

Some packages call 'rsync -a' to copy files from their BR directory
(under package/) where we don't track or care about permissions, so
the result is not well-defined. But as long as the source is under
output/host or output/build we should be ok, meaning: we won't depend on
volatile things like the umask or the untracked permissions of the repo.

Of course, you probably know better about mono than I do, so if you do
find a problem let me know!

Thanks!
-- 
Guido Martínez, VanguardiaSur
www.vanguardiasur.com.ar