This is more of a git related question than openshift.
When I push files to the git server using git, I see that the file permissions of my perl index.cgi f
Bring authority in this case gitweb folder.
gitweb/
drwxr-xr-x 3 root root 4096 Sep 25 12:01 .
drwxr-xr-x 225 root root 12288 Oct 27 20:10 ..
-rwxr-xr-x 1 root root 251319 Sep 23 04:36 gitweb.cgi
lrwxrwxrwx 1 root root 10 Sep 23 04:36 index.cgi -> gitweb.cgi
drwxr-xr-x 2 root root 4096 Sep 25 12:01 static
This is more of a git related question than openshift.
Actually, it is more related to openshift than it is to Git: Git only records 644 and 755 permissions.
But the destination system managing a checkout (and updating a working tree) would set the permission according to the default umask (which could be in your case 077).
Make sure the default umask is 022.
Regarding the hook, check its name ('post-update', no extension) and permission (it must be executable, 755 would be useful)