mercurial: connecting two related repositories

hg-connect.sh

# This is how to fix things if you somehow manage to end up with two
# repositories for the same project, where the last changeset in the
# old repo should be the parent of the first changeset in the new one.
# I needed to do this for Schism Tracker at one point. No idea how I
# mangled it, but here's what I did.
# (A tip of the hat owed to #mercurial on Freenode for helping me.)

# FOREWARNING: this will alter all the changeset IDs in the new repo!

newid=$(hg -R newrepo log -r0   --template '{node}')
oldid=$(hg -R oldrepo log -rtip --template '{node}')
echo $newid $oldid > map
hg convert --splicemap map newrepo oldrepo