Never apply string formatting to generated errors with util.Abort. Otherwise error messages containing % chars yield errors or worse. Fixed (hopefully) all users of util.Abort.

#!/bin/sh

unset HGUSER
EMAIL="My Name <myname@example.com>"
export EMAIL

hg init test
cd test
touch asdf
hg add asdf
hg commit -d '1000000 0' -m commit-1
hg tip