The tarball one is old and largely obsolete.
## get sha1
KERNEL_SHA1=`wget http://gitbuilder.ceph.com/kernel-deb-precise-x86_64-basic/ref/$kernel/sha1 -O- 2>/dev/null`
-CEPH_SHA1=`wget http://gitbuilder.ceph.com/ceph-tarball-precise-x86_64-$flavor/ref/$ceph/sha1 -O- 2>/dev/null`
+CEPH_SHA1=`wget http://gitbuilder.ceph.com/ceph-deb-precise-x86_64-$flavor/ref/$ceph/sha1 -O- 2>/dev/null`
[ -z "$KERNEL_SHA1" ] && echo "kernel branch $kernel dne" && exit 1
[ -z "$CEPH_SHA1" ] && echo "ceph branch $ceph dne" && exit 1