changelog: refuse to add revisions with empty usernames An empty username or a username with a "\n" will make the revision text contain two "\n\n" sequences -> corrupt repository. The problem is that changelog.read expects to find exactly one "\n\n" separator and thus cannot unpack the revision.

#!/bin/sh
rm -rf a
hg init a
cd a
touch a
hg ci -Am0
hg mv a a1
hg ci -m1
hg co 0
hg mv a a2
hg up
hg ci -m2

touch a
hg ci -Am3
hg mv a b
hg ci -Am4 a
hg ci --debug --traceback -Am5 b
hg verify
hg export --git tip