Bugzilla Bug 10803

A small patch to support multiple overlay dirs. The PORTDIR_OVERLAY should be a
colon seperated list. Like this :
PORTDIR_OVERLAY=/usr/portage.local:/home/user/portdir .

Hm not much to it. The only thing i'm slightly worried about is the usage of
PORTDIR_OVERLAY in ebuild.sh which breaks right now i suppose if used with more
then 1 overly entry, i'm not sure of it's importance.

Created an attachment (id=5709) [details]
portage-2.0.44.multioverlay.patch

multi overlay patch , diff to portage-2.0.44/pym/portage.py

reassigning to carpaski, per seemant's irc instruction  Also, it would be nice
for the system to report which ebuild is being used if PORTDIR_OVERLAY is in
effect.  I just spent my evening chasing another bug that would have been
obvious if emerge would just have told me.  If I actually had several overlay
dirs, the nightmare would have been worse. 

sorry for that last unwrapped comment. :( 
 
Also, it would be nice for the system to report which ebuild is being used if 
PORTDIR_OVERLAY is in effect.  I just spent my evening chasing another bug 
that would have been obvious if emerge would just have told me.  If I 
actually had several overlay dirs, the nightmare would have been worse 

I think that's a task for emerge, not portage.py .

carpaski, any progress here ? It's really an easy feature (i use it all the
time) and the patch still applies to my portage (2.0.46-r4) almost perfectly.

It would be nice to have multiple sources for DISTDIR and PKGDIR as well. This
would enable networks of gentoo machines to share nicely.

A vision:
DISTDIR=/usr/portage/distfiles:/mnt/portage/distfiles
use the first file available in the listed paths, if not available, download it
and put it in the first path. /mnt/portage/distfiles for example could come
from an NFS mount. 
PKGDIR=/usr/portage/packages:/mnt/portage/packages-pentium3:/mnt/portage/packages-pentium2
Again, check the current directory first, (assuming this machine is a pentium3)
but then check a network mounted directory of pentium3 binaries, then a
directory of pentium2 binaries.

It would also have some use for those people with laptops. In the above, have a
check if a directory in the list exists before trying to use it. If it doesn't
exist, just display a warning, but no error. But when they are plugged into a
network where those paths exist (with files in them), things suddenly become
much faster for them.

Created an attachment (id=11506) [details]
Fixed the patch so it applies against 2.0.48_pre5

I'm improving this patch to add the same functionality for DISTDIR/PKGDIR now.
I now have a very good reason.

For cvs ebuilds, portage tries to checkout to $DISTDIR/cvs-src/
if $DISTDIR is a read-only NFS mount, then it fails. Having multiple DISTDIR
allows CVS checkouts to a local distdir, while still having access to large NFS
distdirs.

i suppose this one can be closed now ?

Yup.
For multiple distfiles, see Kurt Hindenburg's ongoing work here:
http://www.cherrynebula.net/projects/portage-kvh/portage-kvh.html

I suggested a new approach to him that would avoid breakage in any of the current ebuilds.