So I ran those two exports you gave me and added "-c precise" to my utils call, but it still seems to be running into that pbuilder bug. Here's the output or log/precise-amd64:
pbuilder/build//cow.20008 cow-shell
W: /root/.pbuilderrc does not exist
I: Running in no-targz mode
I: Upgrading for distribution precise
I: copying local configuration
cp: cannot create regular file `/var/cache/pbuilder/build/cow.20008/etc/hosts': No such file or directory
pbuilder update failed
E: could not update with cowdancer, try --no-cowdancer-update option
forking: rm -rf /var/cache/pbuilder/build//cow.20008
-> Copying COW directory
forking: rm -rf /var/cache/pbuilder/build//cow.22359
forking: cp -al /var/cache/pbuilder/base-precise-amd64.cow /var/cache/pbuilder/build//cow.22359
I: unlink for ilistfile /var/cache/pbuilder/build//cow.22359/.ilist failed, it didn't exist?
-> Invoking pbuilder
forking: pbuilder update --override-config --buildplace /var/cache/pbuilder/build//cow.22359 --mirror
http://us-west-2.ec2.archive.ubuntu.com/ubuntu/ --distribution precise --no-targz --internal-chrootexec chroot /var/cache/pbuilder/build//cow.22359 cow-shell
W: /root/.pbuilderrc does not exist
I: Running in no-targz mode
I: Upgrading for distribution precise
I: copying local configuration
cp: cannot create regular file `/var/cache/pbuilder/build/cow.22359/etc/hosts': No such file or directory
pbuilder update failed
E: could not update with cowdancer, try --no-cowdancer-update option
forking: rm -rf /var/cache/pbuilder/build//cow.22359
cannot canonicalize filename /var/cache/pbuilder/base-precise-amd64.cow, does not exist