Git-daemon messing up permissions for gitweb

I'm trying to set up a git repository for mainframe Linux developers to
use at git390.osdl.marist.edu.  Everything _seemed_ to go well, until
Martin Schwidefsky started actually pushing changes back to the
repository.  When he does that, the projects disappear from the web page
that gitweb.cgi is generating.

As far as I can tell, the problem is happening because these files are
being written out with file permissions of 640, and since Apache is
running as user wwwrun, it can't read them:
-rw-r-----  1 sky git  5490 Jun  9 03:35 ./linux-2.6.git/info/refs
-rw-r-----  1 sky git    54 Jun  9 03:35
./linux-2.6.git/objects/info/packs
-rw-r-----  1 sky git    41 Jun  9 03:35
./linux-2.6.git/refs/heads/master
-rw-r-----  1 sky git    41 Jun  9 03:35
./linux-2.6.git/refs/heads/origin
-rw-r-----  1 sky git  5490 Jun  9 04:00
./s390-experimental.git/info/refs
-rw-r-----  1 sky git     1 Jun  9 04:00
./s390-experimental.git/objects/info/packs
-rw-r-----  1 sky git    41 Jun  9 04:00
./s390-experimental.git/refs/heads/master
-rw-r-----  1 sky git  5490 Jun  9 11:31 ./s390-features.git/info/refs
-rw-r-----  1 sky git     1 Jun  9 11:31
./s390-features.git/objects/info/packs
-rw-r-----  1 sky git    41 Jun  9 11:31
./s390-features.git/refs/heads/master
-rw-r-----  1 sky git  5490 Jun  9 03:41 ./s390-fixes.git/info/refs
-rw-r-----  1 sky git     1 Jun  9 03:41
./s390-fixes.git/objects/info/packs
-rw-r-----  1 sky git    41 Jun  9 03:41
./s390-fixes.git/refs/heads/master

I know I could brute-force this by adding wwwrun to the git group, but I
first wanted to find out if that is the solution, or if something is
wrong with the way I've set things up.  I tried searching the mailing
list archives, but nothing that appeared to be relevant turned up.

Thanks in advance for any help,

Mark Post