Catch SIGHUP
This should reduce the chance that a repo we're connected to via ssh
gets interrupted without doing rollback.
+ hg clone http://localhost:20059/ copy
requesting all changes
adding changesets
abort: error 111: Connection refused
transaction abort!
rollback completed
+ echo 255
255
+ ls copy
ls: copy: No such file or directory
+ cat
+ python dumb.py
+ sleep 2
+ hg clone http://localhost:20059/foo copy2
requesting all changes
adding changesets
abort: HTTP Error 404: File not found
transaction abort!
rollback completed
+ echo 255
255
+ set +x