Problem acquiring Angstrom Sources

I'm trying to get the kernel sources for the stock Angstrom
distribution. I'm following the instructions here:

I ran sudo on my Ubuntu dev system. It downloaded the code and
patches but hung in this area.

if [ "${EXTERNAL_TREE}" ] ; then
  #we are pulling the external tree into 1st branch, and checkout the
SHA into a 2nd,
  #which saves a little pain in cleaning up master, when switching
between different beagleboard branches
  git checkout ${EXTERNAL_SHA} -b tmp-patching-branch-sha

Specifically, it hung on the "git pull" instruction. No error message,
no bail-out, just nothing.

Here's what the shell trace looked like leading up to the offending command:

+ git checkout master -f
Checking out files: 100% (32837/32837), done.
Switched to branch 'master'
+ git describe
+ git branch -D tmp-patching-branch
+ git branch -D tmp-patching-branch-sha
+ true
+ grep v3.2
+ grep -v rc
+ git tag
+ git checkout -f v3.2 -b tmp-patching-branch
Checking out files: 100% (32837/32837), done.
Switched to a new branch 'tmp-patching-branch'
+ '[' git:// ']'
+ git pull git:// v3.2-staging